In the context of building a beautiful China, the relevant policies and physique in the field of village and town sewage treatment have been continuously improved, and the village and town sewage market has been continuously released. However, compared with traditional municipal sewage treatment, the village and town sewage treatment is still immature in terms of business model, standard procedures, technical level, operation and management, and the industry is still in the pilot and case promotion stage. In this context, E20 environmental platform organized the collection of cases of village and town sewage treatment in 2020.

As of 12:00 on August 27, 26 rural sewage treatment cases of 23 enterprises have been collected. The specific case list is as follows（ Cases are sorted by the first letter of the recommended unit ）：

The basic information of the 26 cases is as follows. At the end of the article, you can vote for the cases you like.

In addition, we will select the best cases“ Selected excellent cases of water industry in 2020 (Phase II) ”, which will contain more detailed information about the case, and the case selection will be September 17-18, 2020 Shanghai Water Industry Hotspot Forum Please pay attention to the release.

Project name: Rural Sewage Treatment PPP Project in Wuhe County - Tuohu Township Sewage Treatment Station

Project recommended by: Anhui Huaqi Environmental Protection Technology Co., Ltd

Project location: Wuhe County, Bengbu City, Anhui Province

Project category: Township sewage treatment

Participation: EPC

Project Overview

Tuohu Township Sewage Treatment Station is a sub project of the rural sewage treatment PPP project in Wuhe County. The PPP project mainly includes the construction of 8 township level and 66 village level sewage treatment stations and sewage pipe networks, as well as the technical transformation of 24 village sewage stations. The total daily sewage treatment capacity in the near future is 10495m3/d, of which the water volume of Tuohu Township Sewage Treatment Station is 1400m3/d, which was started in August 2019, It was put into operation in December 2019, and the effluent quality was stable and up to standard.

Project technology process/solution overview

(1) Name and principle of technical process/solution

A3O sludge membrane coupled high-efficiency nitrogen and phosphorus removal process is adopted. Its principle is: sewage and return sludge are mixed together into the pre anoxic unit to remove part of nitrate in the mixed solution, providing a good anaerobic environment for the anaerobic unit; Effluent flows into the anaerobic unit automatically, decomposes macromolecular organics in the water into low-grade fatty acids, and releases phosphorus. Dissolved organics are absorbed by microbial cells, resulting in BOD in sewage five Concentration reduction; The effluent flows into the anoxic unit by gravity, and the carbon source in the influent is used to denitrify the returned nitrifying liquid. The number and activity of denitrifying bacteria are greatly increased by implanting bionic aquatic grass filler in the anoxic zone, and the denitrification efficiency is strengthened; The effluent flows into the aerobic unit by gravity. The organic pollutants in the sewage are oxidized and degraded by the high concentration aerobic microorganisms attached to the biological active suspension filler and some suspended sludge, and the organic pollutants in the sewage are transformed into carbon dioxide and water that are harmless to the environment. The ammonia nitrogen and organic nitrogen compounds in the sewage are oxidized to nitrate (nitrification reaction), At the same time, excessive phosphorus uptake was carried out; Effluent flows automatically into the sedimentation unit for mud water separation to remove most SS in sewage; A part of the sludge in the sedimentation unit flows back into the anaerobic unit, and the surplus sludge is discharged into the sludge storage tank, and the mobile sludge dewatering truck is used for regular dewatering and transportation for disposal.

(2) Applicable scope of technical process/solution

It is applicable to domestic sewage in sewage treatment fields such as small towns, beautiful rural construction, residential quarters, villa resorts, tourist attractions, schools and hospital sanatoriums.

(3) Technical process/solution features and advantages

1) Stable effluent quality: the introduction of bionic aquatic grass filler has strengthened the performance of microbial carrier, formed a self renewing biofilm, which has a large area of gas and liquid mass transfer. The structure of the system is simulated by hydraulic flow pattern, effectively reducing the dead zone and other invalid volumes, improving the pollutant removal rate and strong impact load resistance;

2) Low operation cost: through the unique steady flow system design of air lift micro power, accurate reflux and mixing are realized, energy consumption is reduced, and failure points are reduced; The sludge index of the sludge film coupling system is small and the sludge age is long, so that the system sludge production is small and the treatment cost is reduced; Adopt intelligent water affairs remote management system to significantly reduce labor costs and operating costs;

3) Small floor area: the aeration system adopts accurate design of flow state simulation, which increases the mass transfer efficiency between microorganisms and pollutants, thereby shortening the hydraulic retention time and reducing the pool volume;

4) The unique thermal insulation design can add thermal insulation materials between the gusset plate and the pool wall to meet the operation in cold regions.

Photos of plant or main equipment

Project name: Full coverage PPP project for domestic sewage treatment in market towns of Xianfeng County

Project recommended by: Beijing Anlisi Environmental Technology Co., Ltd

Project location: Xianfeng County, Enshi Tujia and Miao Autonomous Prefecture, Hubei Province

Project category: Township sewage treatment project

Participation: Process equipment EPC

Project Overview

The comprehensive domestic sewage treatment PPP project in Xianfeng County, Hubei Province covers 8 towns, including Xiaocun Township, Tangya Town, Dingzhai Township, Huolongping Township, Yangdong Market Town, Zhongbao Town, Huangjindong Township and Daluba Market Town in Xianfeng County, Hubei Province, with a total treatment capacity of 4000 tons/day. BOT (construction operation handover) mode is adopted, and the whole life cycle of the project is 26 years, including 1 year of construction period and 25 years of operation period.

The fluidized-bed sludge film process and self aeration dissolved oxygen regulation are realized by using the fluidized-bed technology of the ANLIS SATBR self aeration three-phase biofilm reactor, with strong shock load resistance, simple equipment and easy maintenance. The main structure of the process is modular and integrated, which greatly shortens the construction period. Emission standard GB18918-2002 Class I A standard. At present, all of them have been completed and put into operation.

Project technology process/solution overview

(1) Name and principle of technical process/solution

Name: Anritz SATBR Cyber Process;

Principle: A/O+biofilm+filter cloth filtration+UV disinfection.

(2) Applicable scope of technical process/solution

Scope of application: township sewage treatment project with a treatment scale of 500~10000m3/d

(3) Technical process/solution features and advantages

Equipment standardization: the equipment is designed and produced according to the maximum standardization before leaving the factory to reduce non-standard equipment and make the on-site installation more efficient;

Simplification of construction: highly integrated standardized products, rapid assembly and installation on site, and low construction difficulty; Less civil construction.

Modularization of process section: modular design and construction of each functional area are closely connected, with short construction period and small land occupation of the whole plant.

The combined aeration dissolved oxygen technology is adopted: strong oxygen charging capacity, high oxygen charging efficiency, the aeration mode can be adjusted at any time, and energy consumption can be saved by 55%.

The sludge film combination technology of fluidized bed is adopted: the purpose of improving the concentration of activated sludge and resisting water quality impact load is achieved by adding biological fillers on our proprietary self aeration three-phase bioreactor and fluidizing through the rotation of the runner.

Low maintenance: simple machinery and equipment, simple personnel management and maintenance.

Cloud control technology: crop networking interfaces are reserved for each process equipment, and remote monitoring and control can be added according to the owner's needs.

Photos of plant or main equipment

Project name: 24 sewage treatment facilities projects in Banqiao Township, Yilong County

Project recommended by: Beijing Anlisi Environmental Technology Co., Ltd

Project location: Yilong County, Nanchong City, Sichuan Province

Project category: Township sewage treatment project

Participation: Equipment supply and installation

Project Overview

The Lianpian Sewage Treatment Project in Yilong County adopts the ANLIS SATBR series products, and the water treatment capacity of a single project varies from 50-2000m3/d. Based on the intelligent system and automatic operation of the SATBR integrated sewage treatment facility, cloud control signal interface is reserved, and the integrated monitoring system implements unified management, so as to discover the operation status in time and carry out unified maintenance and management.

Project technology process/solution overview

(1) Name and principle of technical process/solution

AO+MBBR+filter cloth filter tank+UV disinfection

The combination process of anaerobic/aerobic activated sludge method and biofilm method is adopted, and the microorganism grows on the MBBR filler, with high impact resistance. At the same time, the filler has a secondary cutting effect on the air. The utilization rate of oxygen in the air is greatly improved, which can effectively reduce power consumption and save electricity.

(2) Applicable scope of technical process/solution

The domestic sewage treatment capacity is 50-2000m3/d.

(3) Technical process/solution features and advantages

Taking SATBR Cyber treatment process as the core technology, aiming at the main problems of the rural/township integrated sewage treatment project (scattered projects, large fluctuations in water quality and quantity, difficult operation and maintenance, etc.), relying on its own patent technology advantages, standardized design, automatic intelligence Run in real time, monitor the equipment operation in real time, and upload it to the cloud control system for centralized and unified management.

Integrating the advantages of activated sludge method and biofilm method, the AO section is used to achieve biological nitrogen removal, the full-automatic cloth filter is used to achieve deep filtration, and the patented ultraviolet sterilization technology of ANLIS is used to achieve disinfection treatment. The sewage is discharged stably up to the standard. Equipment operation and maintenance are more convenient and labor intensity is low. At the same time, the system occupies a small area and has low power consumption.

Photos of plant or main equipment

Project name: Hebei Fuping Rural Domestic Sewage 1200t/d Integrated Project

Project recommended by: Beijing Bohuite Environmental Protection Technology Co., Ltd

Project location: Fuping County, Baoding City, Hebei Province

Project category: Rural sewage treatment project

Participation: Equipment supply

Project Overview

The project is located in Fuping County, Hebei Province. It treats rural domestic sewage and provides the owner with 8 sets of BioComb-53HC integrated sewage treatment. The project is divided into three stations, with the water treatment capacity of 600t/d, 300t/d and 300t/d respectively; The effluent quality of each station meets the surface quasi Class IV standard.

The project has been completed and is in the stage of commissioning operation. The station is located in the north of China. The way of building civil buildings is adopted to ensure the stable operation of the system under low temperature in winter by heating or installing air conditioners.

Project technology process/solution overview

(1) Name and principle of technical process/solution

Equipment name: BioComb integrated decentralized sewage treatment unit

Technical principle: BioComb integrated decentralized sewage treatment device integrates the whole set of sewage treatment units into standard marine containers, which is highly modular. The main functional units include oxygen deficient (anaerobic) zone, aerobic zone, high-efficiency clarifier, filtering device (only for Class A or higher emission standards), disinfection device and equipment room. The main process principle is the coexistence of AnO contact oxidation sludge membrane biochemical process, and the air boost technology is used to achieve high reflux ratio and low dissolved oxygen control to treat sewage, effectively realizing the pollutant carbon Efficient removal of nitrogen and phosphorus. AnO contact oxidation method is that there is contact oxidation environment in the biochemical tank, that is, biochemical is divided into anoxic section and aerobic section, and biofilm carrier fillers with suitable shape and large specific surface area are filled in both areas, so as to form biofilm on the surface of the filler, creating contact oxidation environment. The role of the filler is to attach active biofilm on the surface of the filler, As the internal anoxic environment is bound to form an insufficient oxygen supply or even anaerobic state in the inner layer of the biofilm, a biological community with a long food chain formed by anaerobic bacteria, facultative bacteria, aerobic bacteria, protozoa and metazoa is formed in the biofilm, which can effectively anaerobic degrade the CODCr that cannot be degraded by aerobic biology into biodegradable organic matter, It can also improve the nitrogen removal efficiency. The concentration of biosolids in the tank is higher than that of activated sludge process and biofilter, and has a higher volume load.

In order to deal with the characteristics of rural domestic sewage and solve the problems of unstable water quality and quantity of incoming water and high nitrogen content in northern areas, AnO contact oxidation method attaches a large number of microorganisms on the biological filler, which can be better applied to such situations. It has strong adaptability to fluctuations in water quantity and quality, and has a local anaerobic environment, so the nitrogen removal effect is better.

The scale of rural sewage treatment is small, and each functional unit usually adopts the form of integrated equipment. Setting fillers in the biochemical tank can further increase the sludge concentration of the biochemical tank, increase the volume load, reduce the tank capacity, and thus save land.

(2) Applicable scope of technical process/solution

BioComb integrated decentralized sewage treatment device is a compact high-end integrated sewage treatment device designed for small or mobile decentralized sewage treatment systems by the research and development team of Bohuite, drawing on the experience of BioDopp integrated biochemical treatment process technology. It is suitable for small and medium-sized sewage treatment scale, such as centralized communities, rural areas, high-speed service areas with a population of less than 10000 people Villas, sanatoriums, military areas, schools and hotels in the suburbs; Interception of point source pollution along rivers and black and odorous water bodies; Domestic sewage below 2000m3/d; Industrial or other sewage with the same target pollutant equivalent; All other decentralized or distributed small sewage treatment stations. The device integrates the whole set of sewage treatment unit into a standard marine container, which is highly modular and convenient for transportation. The product has the advantages of low energy consumption, small land occupation, simple operation and maintenance, excellent effluent, and complete series. According to the needs of users, sewage treatment can be achieved as a complete set of products for discharge and reuse.

According to the requirements of drainage standards, the effluent of BioComb can meet the Class I B, Class I A or surface quasi Class IV (or local standards) standards in the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002).

(3) Technical process/solution features and advantages

Technical process characteristics:

1) Highly integrated integrated design, standardized and serialized products, compact structure, small footprint;

2) Suspended sludge coexists with biofilm, with rich and large microbial species, high volume load and low sludge output;

3) Low air flow microporous aeration device, with oxygen utilization rate of 40%, low energy consumption and low operating cost;

4) The low head air lift technology achieves high reflux ratio, improves the impact resistance of the biochemical system, and reduces energy consumption;

5) The fan is the main power electrical equipment of the whole equipment, which is easy to operate and maintain; High degree of self-control, simple and flexible operation, remote monitoring and unattended;

6) The equipment can be buried or placed on the ground, which has the advantages of being movable, occupying less land, fast transportation, flexible and convenient installation, etc.

7) Simultaneous removal of carbon, nitrogen and phosphorus to achieve sustainable, stable and efficient surface quasi IV effluent standard

Technological advantages:

1. Standardized manufacturing, excellent quality and long service life; 2. Container transportation and transfer are fast and convenient; 3. Advanced process technology, ultra-low energy consumption, stable and reliable operation; 4. Integrated design and customized appearance; 5. Small floor area and low civil construction cost; 6. The remote mobile terminal is easy to operate and maintain.

Photos of plant or main equipment

Project name: Construction Project of Rural Small Sewage Treatment Station in Huangshandian Village, Zhoukoudian Town, Fangshan District, Beijing

Project recommended by: Beijing Huayu Huihuang Ecological Environmental Protection Co., Ltd

Project location: Zhoukoudian Town, Fangshan District, Beijing

Project category: Rural sewage treatment project

Participation: EPC

Project Overview

The designed daily treatment capacity of Beijing Fangshan District Pofengling Sewage Treatment Station is 42 m3/d. The sewage comes from rural domestic sewage and production sewage of catering and accommodation industry. It mainly includes 13 sets of septic tanks, 14 sets of "Water Magic Cube" wetland ecological purification tanks, procurement and installation of pipelines in the treatment station, electrical equipment in the treatment station, main cables within 20 meters outside the treatment station, fences, walkway bricks and green turf in two treatment stations. The project was commenced in August 2019, and completed commissioning and put into operation in September 2019.

Project technology process/solution overview

(1) Name and principle of technical process/solution

Technical process name: Shuimofang Wetland Ecological Purification Tank

Technical principle: The Shuimofang Wetland Ecological Purification Tank will combine the improved A/O process with the vertical ecological wetland process, and combine the German new microporous aeration technology, airlift plug circulation technology, and three-phase separation and quick clarification technology to add special biological filler in the reactor and form a facultative environment, so that microorganisms can effectively degrade organic pollutants; At the same time, through the adsorption, volatilization, fixation and transformation of green plant roots in the ecological wetland, the sewage quality can be further purified.

(2) Applicable scope of technical process/solution

It is suitable for various small-scale (3-50m3/d) decentralized domestic sewage treatment, such as rural households, public toilets, independent villas, tourist attractions, hotels, etc. It is an ideal sewage treatment equipment for point source pollution of rural domestic sewage.

(3) Technical process/solution features and advantages

① The process combines A/O and wetland technology, decomposes organics through aerobic microorganisms, and decomposes pollutants through the adsorption of wetland fillers and the absorption of wetland plants, so that the water quality can be multiple purified in the reactor;

② The air lift technology is a method to lift the liquid by using the liquid density difference. This product uses the air lift technology to realize the discharge of excess sludge and the return of nitrifying liquid. The specific advantages are as follows: simple equipment, easy operation; Maintenance free, low energy consumption;

③ The microporous aeration technology is adopted to realize the mixing of mud water mixture, and control the DO of the anoxic tank within the optimal range to provide conditions for nitrogen removal;

④ After the sewage passes through the AO section in the reactor, it passes through the specially designed three-phase separation area to return the activated sludge to the reactor. At the same time, the bubbles generated by the bottom aeration rise back to the aerobic area, and the water is separated into the wetland filler area.

Photos of plant or main equipment

Project name: 500t/d sewage treatment project in Beiliu Village, Liucun Town, Changping District

Project recommendation unit : Beijing Zhongsi Shuiling Water Treatment Technology Co., Ltd

Project location: Liucun Town, Changping District, Beijing

Project category: Township sewage treatment project

Participation: EPC

Project Overview

The Beiliu Sewage Treatment Project in Liucun Town, Changping District, Beijing is located in Liucun Town, Changping District. The sewage treatment raw water of the sewage plant comes from the daily domestic sewage of residents in Beiliu Village, Liucun Town. The daily treatment capacity is 500t/d, the average hourly treatment capacity is 20.83t/h, the total coefficient of variation is 2.48, and the maximum hourly flow is 51.67t/h. The effluent meets the Class I B standard of the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (DB11/890-2012) in Beijing.

Project technology process/solution overview

(1) Name and principle of technical process/solution

Technical name: VFL vertical flow maze process

Technical principle: VFL process adopts vertical flow labyrinth structure in anaerobic zone and anoxic zone, which greatly extends the process of anaerobic zone and anoxic zone from the structure, eliminates the adverse effect of returned activated sludge on anaerobic zone and anoxic zone, and greatly improves its nitrogen removal efficiency. At the same time, it is conducive to phosphorus removal, control and adapt to the use of carbon sources in anaerobic zone and anoxic zone.

The sewage flows into the front end of the anaerobic zone first, and is vertically baffled with the mixed liquid flowing back from the middle of the anoxic zone. Therefore, there is some dissolved oxygen in the water in the front end of the anaerobic zone. After the baffled flow, the concentration of dissolved oxygen drops rapidly after the sewage enters the second and third grids, and enters the anaerobic state. Organic pollutants on one side are hydrolyzed to improve the biodegradability and BOD five On the other hand, phosphorus is fully released to improve the phosphorus removal capacity of the system.

After entering the anaerobic zone, the sewage flows through the anaerobic zone, the anoxic zone, the aerobic zone and the sedimentation zone by gravity. The effluent flows to the drum filter by gravity, and then enters the clean water zone, which can reach the standard without any physical and chemical advanced treatment.

A part of the activated sludge in the sludge bucket in the sedimentation area flows back to the front of the anoxic area. This part of the sludge has dissolved oxygen. Also due to the characteristics of the vertical flow structure, the water flows to the second and third grids of the anoxic area, and the dissolved oxygen concentration drops rapidly. Denitrification is carried out very thoroughly in a long anoxic process, and the carbon source (BOD) in the sewage is fully utilized five ）Its denitrification rate is far higher than that of denitrification relying on endogenous respiration, so the required denitrification retention time is short and the volume is small.

VFL technology has a unique sludge circulation route. In addition to half of the activated sludge in the sludge bucket in the sedimentation area is used for denitrification, the other half of the activated sludge returns to the aerobic area, and the mixed liquor in the aerobic area is discharged into the sludge area, and then returns from the sludge area to the anaerobic area. This sludge recycling process enables microorganisms to continuously proliferate, age, digest and regenerate in the system, so that the sludge can maintain its activity. In the aerobic zone, it is basically in the fully mixed reaction zone with low load, and the microorganism is in a low activity state. After entering the sludge tank, it gradually enters the internal respiration state. The sludge is partially digested, and the remaining microorganisms are naturally screened. When such microorganisms enter the anaerobic zone with high load, their activity is re activated, and the activity of adsorption and degradation of organic matter is gradually enhanced, The reaction efficiency and treatment effect are improved. At the same time, the sludge can remain active for a long time and realize sludge reduction in the process of autometabolism.

(2) Applicable scope of technical process/solution

• Domestic sewage treatment

Small and medium-sized towns, villages, scenic spots, resorts, expressway service areas

Watershed management

Upgrading and reconstruction of sewage plant, trusteeship operation of sewage plant, etc

• Industrial wastewater treatment

Slaughtering wastewater, breeding wastewater, food wastewater, brewery wastewater, etc

• Product Series

Integrated sewage treatment equipment: 1t~100t

Composite assembled sewage treatment equipment: 100t~2000t

Concrete sewage treatment plant: 100 tons~50000 tons (single)

(3) Technical process/solution features and advantages

Low construction cost: no regulating tank is required, and the floor area is small. Simple process and less equipment. Integrated design, short construction period.

Wide adaptability: wide adaptability of water quality: low concentration sewage in the south and high concentration sewage in the north can reach the standard stably. Wide range of temperature adaptation: under the conditions of low temperature in the northeast and high temperature in the tropics, it can stably reach the effluent standard. Wide range of environmental adaptation: no odor generation, applicable to any area with strict environmental requirements.

Complete scale: the treatment scale is 1 ton~50000 tons, realizing the full scale coverage of sewage treatment in villages and towns.

Suitable for continuous treatment: VFL sewage treatment director can operate automatically, monitor remotely, and be unattended. It is suitable for rural sewage treatment projects.

Low operating cost: less electromechanical equipment and low energy consumption. Simple equipment, low operation and maintenance costs. Low sludge production and low sludge disposal cost. Internet remote management eliminates the need for personnel on duty, reducing labor costs.

Photos of plant or main equipment

Project name: Beikong Meishan Dongpo Township Sewage Treatment Plant (Station) Upgrading and Reconstruction and Related Supporting Facilities Construction Project

Project recommended by: Chengdu Bishui Water Construction Engineering Co., Ltd

Project location: Dongpo District, Meishan City, Sichuan Province

Project category: Township sewage treatment project

Participation : Equipment supplier

Project Overview

This project is a standard upgrading and reconstruction project of township sewage treatment plants (stations) in Dongpo District, Meishan City operated by Northern Control and related supporting facilities construction project, including Duoyue Town Sewage Treatment Station and Gongcun Sewage Treatment Station in Baima Town, located in Dongpo District, Meishan City, Sichuan Province. The treatment process is A2O+MBBR, the sewage treatment capacity of Duoyue Town is 1000 tons/day, and the sewage treatment capacity of Gongcun Village in Baima Town is 500 tons/day, New treatment structures include: grid channel, regulating tank, sludge tank, integrated treatment equipment foundation, deodorization equipment foundation, guard room and discharge channel.

The effluent quality meets the Class I A standard of the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002).

Project technology process/solution overview

1. Technical process/solution name and principle

A2O+MBBR technology process

2. Applicable scope of technical process/solution

Develop a set of overall solutions for the treatment needs of domestic sewage in centralized residential areas, towns, hotels, shopping malls, schools, stadiums, industrial and mining enterprises, airport terminals, expressway service areas, etc.

3. Technical process/solution features and advantages

A2O+MBBR technology process is adopted, including the main treatment module of sewage treatment equipment, control system, aeration system, monitoring system, Internet of Things system, etc. It is characterized by fast assembly, short commissioning period and good treatment effect.

The direct operation cost includes electricity cost and reagent cost. At present, the statistics show that the minimum equipment operation electricity cost is 0.25 yuan/ton, the minimum reagent cost is 0.06 yuan/ton, and the minimum direct operation cost is 0.31 yuan/ton.

The designed effluent quality meets the Class A standard of the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002).

Photos of plant or main equipment

Project name: Wuqing District Rural Domestic Sewage Treatment Project

Project recommended by: Dayu Water Saving Group Co., Ltd

Project location: Wuqing District, Tianjin

Project category: Rural sewage treatment project

Participation: Investment, construction and operation

Project Overview

The project is a key environmental improvement project such as new rural construction and beautiful rural construction. The project investment scale is 1.592 billion yuan. The BOT mode (construction operation handover) is adopted, and the cooperation period is 15 years (construction period is 3 years, operation period is 12 years). Up to now, 268 sewage treatment stations have been completed, with a total treatment capacity of 306600 tons/day, 1.87 million meters of main and branch pipe networks, 110000 manholes, 95000 three grid septic tanks, 109000 household toilets, and an intelligent cloud platform automatic information management system. The project has completed district level acceptance and municipal level acceptance in batches from 2019 to the end of May 2020. At present, all of them are put into use and operate normally.

The project will comprehensively collect and treat the "four water" including toilet wastewater, bath wastewater, laundry wastewater and kitchen wastewater of farmers, and the sewage generated in public places such as middle and primary schools, village level activity places and nursing homes in the village. It covers 301 villages in 25 towns and townships in the whole region, benefiting more than 400000 people.

Project technology process/solution overview

(1) Name and principle of technical process/solution

Improved A ^two The O+MBR combined process is an improved process combining activated sludge, biological nitrification and denitrification, biological phosphorus removal and membrane bioreactor. It uses membrane modules to carry out solid-liquid separation instead of traditional sedimentation. On the basis of anaerobic anoxic aerobic, it carries out staged water inflow, adds deoxidation tank and other improvements. BOD, SS, organic nitrogen and phosphorus will be removed together.

(2) Applicable scope of technical process/solution

The rural sewage treatment station with a scale of 40~400m3/d can reach the national and local discharge standards.

(3) Technical process/solution features and advantages

The improved A2O+MBR process adds a deoxidation tank, which uses segmented water inflow to solve the problem of high dissolved oxygen in the internal reflux caused by the combination of A2O and MBR. It is a highly efficient biological denitrification process. The anoxic zone makes full use of the organic carbon source of the water inflow for denitrification, saving reagent costs. In addition, membrane tank replaces secondary sedimentation tank, reducing effluent turbidity, saving land occupation and infrastructure investment.

Photos of plant or main equipment

entry name : Comprehensive rural environment of Mengzhou in 2019 Renovation of sewage treatment stations and sewage pipe network construction projects in 4 villages including Huzhuang Village

Project recommended by: Greenklee Environmental Technology Co., Ltd

Project location: River Mengzhou City, Jiaozuo City, South Province

Project category: Rural sewage treatment

Participation: EPC

Project Overview

The 370T/d rural domestic sewage treatment project in Huzhuang Village of Mengzhou and four surrounding villages, supporting plant works, civil works, water supply and drainage works, plant greening, etc. The sewage treatment process of this project adopts the "AAO+flat membrane MBR process", and the process is set with 8 groups of CPVC membrane components, with a membrane flux of 0.48m3/m2 · d, The effluent quality of the sewage station meets the Class A standard of the Integrated Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002). The effluent is discharged into Laomang River, a nearby river. The sewage station is automatically unattended, and remote information transmission control is realized. During operation, the effluent quality is stable and better than the Class A standard. The operating cost per ton of water is about 0.7 yuan/m3.

Project technology process/solution overview

(1) Name and principle of technical process/solution

The sewage treatment station adopts integrated MBR sewage treatment equipment. The main process of the sewage treatment station is AAO-MBR process. AAO process is a secondary biological treatment process consisting of anaerobic anoxic aerobic section. Under anaerobic conditions, it can effectively release phosphorus. Under anoxic conditions, nitrate nitrogen is reduced to nitrogen by heterotrophic bacteria; Under aerobic conditions, on the one hand, organic pollutants are oxidized and degraded by microorganisms, and on the other hand, ammonia nitrogen is oxidized to nitrate nitrogen by nitrobacteria. AAO process has the function of removing organic pollutants, nitrogen and phosphorus in sewage.

Membrane bioreactor (MBR) is a new technology that combines membrane separation technology with wastewater biochemical treatment. In practical application, AAO and MBR processes are used together. The AAO-MBR process membrane filtration system takes the flat membrane module as the core equipment, and pumps water through membrane filtration to replace the secondary sedimentation tank in the conventional process for solid-liquid separation. The MBR membrane of this project is in the form of flat membrane.

(2) Applicable scope of technical process/solution

The integrated MBR sewage treatment equipment is applicable to the treatment and reuse of domestic sewage in residential quarters, villages, towns, office buildings, shopping malls, hotels, restaurants, sanatoriums, organs, schools, troops, hospitals, highways, railways, factories, mines, tourist attractions and other small and medium-sized industrial organic wastewater such as slaughtering, aquatic product processing, food, etc.

(3) Technical process/solution features and advantages

1) MBR adopts CPVC flat membrane with an average pore diameter of 0.25 μ m, which can carry out solid-liquid separation efficiently. The effluent quality standard is high, the quality is stable, the suspended solids and turbidity are close to zero, and it can be directly reused.

2) The high efficiency of the membrane intercepts the flow of microorganisms completely in the reactor, realizing the complete separation of the reactor hydraulic retention time (HRT) and sludge age (SRT), making the operation control more flexible and stable.

3) It has solved the limitation of the sedimentation part caused by the traditional activated sludge method on the maximum biological concentration. The microbial concentration in the reactor is high, 2~5 times that of the traditional method, up to 6000~25000 mg/L. It has strong adaptability to changes in water quality and quantity, and is resistant to impact loads.

4) The system is controlled by PLC, which can realize the whole process automatic control and convenient operation management.

5) CPVC material membrane has strong pollution resistance and is easy to clean. With stable chemical performance and strong oxidation resistance, it can be cleaned with common oxidizing agents (such as 5 ‰ sodium hypochlorite solution).

6) It occupies less land, starts quickly, and is not affected by sludge bulking.

Photos of plant or main equipment

Project name: Rural Environmental Sewage Treatment Project in Lixin Village, Teng County, Wuzhou City

Project recommended by: Guangxi Biqingyuan Environmental Protection Investment Co., Ltd

Project location: Teng County, Wuzhou City, Guangxi Zhuang Autonomous Region

Project category: Rural sewage treatment

Participation: Investment, construction and operation

Project Overview

The daily sewage treatment capacity of Lixincun Sewage Treatment Station is 150 tons, the supporting pipe network is about 3 km, the sewage collection rate is 92%, and the construction period is 45 days. The construction mode of construction+equipment supply+entrusted operation is adopted. Biqingyuan Company adopts the core process of self-developed nano ceramic membrane sewage treatment, which effectively solves the pain points of large fluctuations and dispersion in the amount of local rural domestic sewage and COD influent water quality, realizes the reuse of reclaimed water after sewage treatment or discharge up to standard, and the effluent quality is better than the Class A standard of the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002), It has perfectly achieved the goal of improving the comprehensive management of the surrounding environment of Tengxian secondary water source protection zone. At the same time, the project benefits 22 natural villages and more than 2000 families under the jurisdiction of Lixin Village.

Project technology process/solution overview

The wastewater treatment project in Lixincun adopts the NanoCeramic Membrane Wastewater Treatment Technology (NCMT), which is a new water treatment process organically combining the nano ceramic membrane separation technology and MBR biotechnology. The nano flat ceramic membrane produced by the fifth generation of nano ceramic technology is combined with advanced biochemical technology, By controlling parameters such as dissolved oxygen concentration (DO), sludge concentration (MLSS), retention time (HRT) and sludge age (SRT) in the system, simultaneous nitrification denitrification (SND) and biological phosphorus removal are realized, so as to reduce energy consumption, reduce sludge production and achieve the purpose of energy conservation and emission reduction.

The technical core of the treatment process is the nano ceramic membrane high-efficiency water purifier (NCMWP). Based on the NCMT technology, it is a composite water purifier integrating ceramic membrane assembly and bioreactor, integrating the characteristics of biological treatment and ceramic membrane filtration technology. It is widely used in urban domestic sewage, township sewage treatment and other fields, adopting highly integrated design Standardized production mode.

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Project name: Rural Domestic Sewage Treatment Project in Banqiao Town, Dongfang City, Hainan Province (Bid Section I)

Project recommendation unit : State Power Investment Group Yuanda Environmental Engineering Co., Ltd

Project location: Banqiao Town, Dongfang City, Hainan Province

Project category: Rural sewage treatment project

Participation: EPC+equipment supply

Project Overview

In order to improve the living environment and build a "beautiful village", our company undertook the rural sewage treatment project (Lot I) in Banqiao Town, Dongfang City, Hainan Province in the "PC" mode. The owner is Dongfang Ecological Environment Bureau. The project covers 3451 households in 10 villages, including Baoli Village, Banqiao Town A ^two O+MBBR integrated biological treatment process, the effluent standard of the sewage treatment unit is Level I B, the total designed treatment capacity is 790t/d, a total of 10 new sewage treatment stations are built, and the total length of the sewage pipe network is 80.705km, including 28.045km main pipe, 52.660km branch pipe into the home, and supporting facilities such as the corresponding collection well, inspection well, integrated lift pump station are also provided. The project signed a contract with November 2019, and then started construction. In August 2020, the project passed the inspection of a third-party testing unit, and the test data was better than the design effect. The total investment of the project is 62.43 million yuan, and the capital source is the new bond funds and municipal financial funds of cities and counties loaned from provincial level.

Project technology process/solution overview

(1) Name and principle of technical process/solution

Overground type A ^two O+MBBR integrated biological treatment process

(2) Applicable scope of technical process/solution

The principle of MBBR process is to increase the biomass and species in the reactor by adding a certain amount of suspended carriers to the reactor, so as to improve the treatment efficiency of the reactor. As the density of filler is close to water, it is completely mixed with water during aeration, and the environment for microbial growth is gas, liquid and solid. The collision and shearing of the carrier in water make the air bubbles smaller and increase the utilization rate of oxygen. In addition, each carrier has different biological species inside and outside. Some anaerobic bacteria or facultative bacteria grow inside, and the outside is aerobic bacteria. Thus, each carrier is a micro reactor, which enables nitrification reaction and denitrification reaction to exist at the same time, thus improving the treatment effect. This technology is widely used in municipal engineering, industrial sewage, and domestic sewage, Especially for decentralized rural domestic sewage, the effect is remarkable.

(3) Technical process/solution features and advantages

MBBR has the high efficiency and operational flexibility of the activated sludge process, as well as the characteristics of the traditional biofilm process, such as impact load resistance, long sludge age and less excess sludge. The effect of organic matter removal is good. The sludge concentration in the reactor is high, and the general sludge concentration is 5-10 times more than that of the ordinary activated sludge method. The treatment efficiency of organic matters is improved, and the shock load resistance is strong. The activated sludge is not easy to expand, the equipment operation is not easy to block, no backwashing is required, and it is easy to maintain and manage. There is no need to set filler support in the aeration tank, which is convenient for the maintenance of filler and aeration device at the bottom of the tank, and can save investment and floor area. Generally, the design scale of a single station can be used in the range of 1~350t/d.

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entry name : Sewage Treatment Project in Qinglian Town, Jiangyou City, Sichuan Province

Project recommended by: sea Tianshui Group Co., Ltd. (Jiangyou Haitian Hongfei Environmental Protection Co., Ltd.)

Project location : Qinglian Town, Jiangyou City, Sichuan Province

Project category: Township sewage treatment

Participation: Investment, construction and operation

Project Overview

Qinglian Town Sewage Treatment Plant is located in Qinglian Town, Jiangyou City, the former residence of Li Bai. The total investment in the plant area and supporting pipe network is 16.5148 million yuan, and the construction scale is 600 yuan in the near future (2020) m three /d. Long term (2030) 1000 m three /d。 The core process of the sewage treatment plant adopts the IBR nitrogen and phosphorus removal sewage treatment technology, and the effluent reaches the Class A Class I standard of the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002) for a long time.

Project technology process/solution overview

(1) Name and principle of technical process/solution

IBR nitrogen and phosphorus removal wastewater treatment technology

(2) Applicable scope of technical process/solution

Township sewage treatment

(3) Technical process/solution features and advantages

The IBR process is a cyclic activated sludge process that integrates anaerobic, facultative, aerobic reaction and sedimentation into a continuous water inflow and outflow process. The reaction tank designed according to this process uses the three-phase separator set at the bottom of the tank to realize continuous water inflow and outflow of a single tank and intermittent aeration. The multi-stage anaerobic/anoxic/aerobic state of sewage in the reaction tank is created by adjusting the aeration stop ratio, so that the sewage is in the best condition of nitrogen and phosphorus removal in the reaction tank, so as to remove N and P as much as possible. The process technology features are as follows:

(1) Continuous flow integrated flow configuration is adopted for continuous water inflow and continuous water outflow;

(2) With the help of three-phase separator, gas-solid liquid separation and sludge return can be realized without secondary sedimentation tank;

(3) Multi stage anaerobic/anoxic/aerobic state, time series nitrogen and phosphorus removal;

(4) Contrary to the traditional sludge granulation principle, high activity micro floc biochemical reaction;

(5) Core equipment: shock mass transfer device. Through submersible pump, two-stage jet is adopted to improve aeration effect, and no blower is required, saving land occupation and civil engineering investment;

(6) Filtration, flocculation and sedimentation: form a dense sludge layer formed by micro flocculated sludge in the separation area through a three-phase separator, and ensure the effluent effect through adsorption and interception.

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entry name : Town level sewage treatment plant and supporting pipe network project in Wuxuan County, Guangxi Zhuang Autonomous Region (six towns)

Project recommended by: Hunan Weichuang Environmental Technology Co., Ltd

Project location: Wuxuan County, Laibin City, Guangxi Zhuang Autonomous Region

Project category: Township sewage treatment project

Participation: EPC+OM

Project Overview

The project is a new project, involving Tongling Town, Tonglan Town, Sanli Town, Dongxiang Town, Huangmao Town and Luxin Town in Wuxuan. The sewage collection area is the main town, with a total scale of 2600 m3/d, and the effluent quality complies with the Class A standard of the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002).

Project technology process/solution overview

(1) Name and principle of technical process/solution

This project adopts VFL (vertical flow maze process) technology, and the process is AAO deformation process. The core of the process is that the anaerobic zone and the anoxic zone adopt a vertical flow labyrinth structure, and multiple downward flow and upward flow sludge beds are connected in series at intervals. The inlet mode of VFL combined tank is pulse inlet, which makes the sludge flow upward in the grid. When the sewage flows upward, the sludge will form a suspended sludge bed, and part of the sludge will flow into the next downward grid with the water flow. Most of the sludge will stay in the grid due to gravity when the water inflow stops, Therefore, this structure keeps a high sludge concentration in the anaerobic anoxic zone and greatly improves the reaction efficiency per unit tank volume.

(2) Applicable scope of technical process/solution

The daily treatment capacity of VFL process is 50 tons/day~2000 tons/day, and the integrated sewage treatment equipment can be used. From 500 tons/day to 50000 tons/day, the steel concrete structure tank body can be used, which is mainly used in the new construction, expansion and standard raising projects of sewage treatment in market towns and counties. The treatment standard can meet the surface quasi Class IV water standard (better than Class A).

(3) Technical process/solution features and advantages

1. Small floor area: no regulating tank is required, the sludge tank is built in, and the combined tank is highly integrated, saving 1/5-1/3 of the floor area compared with the traditional process.

2. Strong resistance to impact load: vertical flow labyrinth structure is adopted, so the sewage will not flow in a short time, and there is no need for a plug and agitator. Maintain a certain speed through stripping reflux to make the sludge layer suspended, and the limit shock load can withstand 150% in a short time.

3. The outlet water quality is stable and up to standard: the unique sludge circulation route, the high sludge concentration in the labyrinth structure, the excellent nitrogen and phosphorus removal effect, the stable operation can be achieved under different climatic conditions, the fluctuation of the inflow water quantity and quality, and the outlet water is up to standard.

4. Mature process and low operating cost:

Simple structure, less equipment maintenance: the core equipment is durable, and the failure rate is extremely low;

Low sludge production: long retention time, sufficient endogenous consumption, and sludge production is about 1/10 of the traditional process;

Less labor cost: high degree of automation, small daily maintenance workload, and intelligent management by controlling the backflow and aeration of labyrinth system through timely ORP indicators.

5. Wide adaptability: 8 years of construction and operation experience in China can achieve stable standard for low concentration in the south, high concentration in the north, low temperature in the northeast and high temperature in the tropics.

6. Environmentally friendly: the whole plant does not need deodorization equipment and has no odor, so it is suitable to build the plant in any area with strict environmental requirements.

7. The structural layout is flexible: the layout of the sewage treatment plant can be designed according to the site conditions, with flexible layout and simple structure.

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Project name: Procurement Contract for Integrated Sewage Treatment Equipment of Miluo Urban and Rural Water Environment Comprehensive Treatment PPP Project (Phase I)

Project recommended by: Hunan Zhishui Environmental Engineering Co., Ltd

Project location : Miluo City, Yueyang City, Hunan Province

Project category: Township sewage treatment project

Participation : Equipment procurement

Project Overview

The project is located in Miluo City, Yueyang City, Hunan Province. It is a township sewage treatment project in the whole county. A total of 19 sewage treatment plants (stations) will be built in market towns or areas, including Miluo Town, Xinshi Town, Sanjiang Town, Dajing Market Town, Quzici Town, Baitang Town, Shendingshan Town, Chuanshanping Town, Taolin Town, Changle Town, Baishui Town and Bishi Town, with a total treatment capacity of 6100 tons, The effluent quality meets the Class A discharge standard of the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002).

Project technology process/solution overview

(1) Name and principle of technical process/solution

Improved AAO+sludge reduction process.

This technology is the core patented technology of the company, and was rated as "Advanced Technology of Environmental Protection in Hunan Province".

Principle: Anaerobic tank (tank A), sewage and return sludge from sedimentation tank are mixed synchronously, microbial strains release phosphorus and absorb dissolved organic matter, BOD in sewage decreases, NH three -N is removed due to cell synthesis. Anoxic tank (tank A), the denitrifying bacteria use the organic matter in the sewage as the carbon source to recycle a large amount of NO in the mixed liquor three -N and NO two -N reverts to N two Release, BOD five Concentration decrease, NO three -N concentration decreased significantly. Aerobic tank (O tank): microbial strains grow and reproduce rapidly in the best dissolved oxygen environment, organic matter is degraded biochemically, organic nitrogen is ammoniated and then nitrified, NH three -N concentration decreases significantly, and nitrification process makes NO three -With the increase of N concentration, P decreased significantly with the excessive uptake of phosphorus accumulating bacteria. The biofilm is composed of mycelia, filamentous bacteria, fungi, protozoa and metazoans. The filamentous bacteria with strong oxidizing ability have a three-dimensional structure between the filler gaps, increasing the contact area and improving the purification ability. Continuous aeration is carried out in section A of sludge reduction area. The sludge in aerobic aeration tank A enters into sedimentation area B. After sedimentation, the supernatant returns in aerobic state, and the settled sludge turns into anaerobic state and enters into sludge storage area C. The sludge storage area is aerated intermittently. The sludge reduction in aerobic sedimentation anaerobic process is realized.

Applicable scope of technical process/solution

1. Decentralized and distributed sewage treatment in rural areas;

2. Centralized treatment of township sewage in groups;

3. Urban sewage collection and treatment without pipe network;

4. On site treatment of river channel pollution interception, etc.

(2) Technical process/solution features and advantages

Advantages: mature and stable process, simple sludge disposal; Highly intelligent to achieve precise control; Highly integrated, easy and convenient installation; Low comprehensive cost and small floor area; Low noise and no odor to ensure green operation; High efficiency nitrogen and phosphorus removal technology: automatically control the reflux ratio of mixed solution, and the ammonia nitrogen removal rate can reach more than 85%; Wide application range and low operation and maintenance cost; The equipment is not affected by temperature changes and operates stably and normally.

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Project name: 2019 Procurement, installation, operation and maintenance of small rural sewage treatment equipment in Shuyang County

Project recommended by: Jiangsu Liding Environmental Protection Equipment Co., Ltd

Project location: Shuyang, Jiangsu

Project category: Rural sewage treatment project

Participation : Equipment supply, construction, installation and operation

Project Overview

The project is located in various towns and villages in Shuyang County, Jiangsu Province, including Zhouji Town, Tanggou Town, Xixu Town, Maowei Town, Guandun Town, Zhangji Town, Dongxiaodian Town, Huji Town, Liheng Town, Zhangwei Town, Longji Town, Yitao Town, Tangjian Town, Huachong Town, etc. It was shortlisted through the municipal supplier selection, and the government publicly purchased bidding equipment in the EPC+O mode. The daily treatment in the station area ranges from 1T to 80T. Liding provides more than 100 sets of sewage treatment equipment. The equipment adopts FRP winding technology, biological contact oxidation (AO) process, wall thickness ≥ 10mm, water pump in the river, electric control system including remote monitoring, PP spherical filler for anoxic tank, MBBR filler for aerobic tank, and the effluent of the equipment meets the national standard Class I B standard. All integrated equipment is equipped with self-developed remote platform online to realize remote patrol and manual accurate operation and maintenance, ensuring that all stations within the coverage achieve all-weather, unattended and efficient operation.

The project has finally achieved a significant reduction in the discharge of environmental pollutants in rural areas and a stable discharge of water up to the standard.

Project technology process/solution overview

(1) Name and principle of technical process/solution

The front level domestic sewage is collected uniformly by the pipe network and collected into the civil engineering regulating tank within the sewage treatment station area. After the process of slag blocking and uniform water quality and quantity, the sewage is orderly, evenly, regularly and quantitatively lifted to the LD-SC-AO series integrated sewage treatment equipment through the PLC integrated automatic control lift pump for advanced treatment. The sewage in the integrated equipment passes through fixed packing anoxic tank, biological contact oxidation tank, sedimentation tank and disinfection tank in turn. The pollution factors in the sewage are fully degraded and decomposed by microorganisms and separated from water, and the sewage is discharged up to standard.

Process principle: improved buried integrated biological contact oxidation (AO) process

(2) Technical process/solution features and advantages

A. High degree of integration, no need to mobilize large-scale manpower and material resources, and the integrated equipment can enter the operation stage after being buried.

B. The technology is advanced and the treatment effect is good. The equipment uses fillers with a large specific surface area, which improves the volume load, greatly reduces the floor area and operating costs, has strong operating stability, good treatment effect, and the effluent can reach the standard stably;

C. All buried construction saves land. The ground can be covered with soil for greening. The environmental landscape effect is good, with low energy consumption, low noise and no odor.

D. Unattended, fully automatic operation, remote monitoring. It provides an independently developed remote monitoring system to ensure that the 24-hour operation of each sewage treatment equipment can obtain real-time monitoring data and real-time SMS notification.

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entry name : Lot II of Yixing Rural Sewage Treatment PPP Project

Project recommended by: Lexus Environmental Protection Co., Ltd

Project location: Yixing City, Jiangsu Province

Project type: Rural sewage treatment

Participation: Investment, construction and operation

Project Overview

This project is the second bid section of Yixing Rural Sewage Treatment PPP Project, that is, rural sewage treatment within Wanshi Town. The project determines the amount of sewage that can be collected by households according to the shape of each village in Wanshi Town and the conditions of going out of the household. Considering the uneven distribution of rural users, the main contents of the project include:

(1) Construction, operation and maintenance of 2851 integrated decentralized sewage treatment facilities in Wanshi Town.

(2) Construction, maintenance and maintenance of pipe network and supporting facilities for 1009 households in 27 natural villages of Wanshi Town.

(3) Construction, maintenance and maintenance of 565 unpowered decentralized treatment facilities and constructed wetlands in Wanshi Town.

Introduction to project technology/equipment

(1) Name of technical process/equipment

① "Purification tank" treatment device; ② PSDEO-MBR integrated processing equipment.

(2) Process/equipment principle

① The treatment method of the purification tank is the flow adjustment solid-liquid separation type support flow circulation mode. The treatment method is to first remove the inorganic solids, parasite eggs and some suspended organics in the drainage through the solid-liquid separation device at the front end of the purification tank. A certain number of spherical fillers are placed in the anaerobic area of the purification tank, and the anaerobic biofilm growing on the filler is used, It plays the role of hydrolysis and acidification of sewage, so as to remove the soluble organic matter in sewage, improve the biodegradability of sewage, and then further treat it with aerobic microorganisms, which can effectively remove COD, SS, ammonia nitrogen, TP and other pollutants in sewage. The treated wastewater passes through the inclined pipe sedimentation area and is divided into a series of shallow sediment layers by the inclined parallel pipes. The treated and settled sediment move and separate in each shallow sediment layer. The mixed liquor returns to the front anaerobic zone through the stripping reflux device to supplement the activated sludge and enhance the effect of nitrogen and phosphorus removal. The sewage after sedimentation and separation flows into the disinfection area set at the end of the purification tank, and is discharged after disinfection.

② The process lifts the sewage from the regulating tank to the anaerobic tank, where phosphorus is released through phosphorus releasing bacteria; Then the sewage flows into the anoxic tank by gravity. Under anoxic conditions, the denitrifying bacteria use carbon source as nutrient, consume carbon source and use denitrification to remove part of NH three -N. Then the effluent from the anoxic tank flows into the aerobic zone automatically; Biological fillers are set in the front of the aerobic zone to increase the biomass and contact area. Aeration devices are laid at the bottom of the tank. Sewage is biochemical degraded into organic matter in the tank and oxidized into harmless substances to reduce BOD, COD and ammonia nitrogen in the water. High concentration mixed liquid partially returns to the anoxic zone to control the concentration of activated sludge in the system, and then the mixed liquid is pushed into the membrane area, MBR membrane equipment is placed in the MBR tank, and aeration devices are also laid at the bottom of the tank, so that sewage continues to be biodegraded in this area; The biodegradable water enters the disinfection pool through the MBR membrane under the action of the self-priming pump, and the disinfected sewage is discharged up to the standard.

(3) Process/equipment characteristics

① Features of "purification tank" treatment device

? Save energy.

? Simple, efficient and short construction period. Lifting lugs are set on the upper side, which can facilitate the removal of lifting ropes even if the excavation size of the foundation pit is very small.

? Convenient maintenance and management. The device has only three regulating valves and is easy to operate.

? The mixed structure is adopted: a baffle is added in the support flow tank to divide it into support flow type and slow support flow type, which is more energy-saving.

? The equipment shell is made of PP, which can be reused. Some waste plastics can be mixed into the raw materials, saving resources, and one-time injection molding can be realized.

② Features of PSDEO-MBR integrated processing equipment

? The membrane bioreactor realizes the complete separation of sludge age and hydraulic retention time, and greatly simplifies the design and operation.

? The interception of membrane avoids the loss of microorganisms, maintains a high sludge concentration in the reactor, thus reducing the sludge load, and saves the secondary sedimentation tank and floor area.

? Due to the interception of membrane, the sludge age is prolonged, creating favorable conditions for slow growing microorganisms.

? The technology integrates anaerobic zone, anoxic zone, aerobic zone and membrane system zone, which is easy to realize automatic control and operation management.

? The shell of the integrated device is made of PP, with strong corrosion resistance, good thermal insulation effect, low noise, convenient transportation, short construction period, and equipment production.

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entry name : Upgrading and Reconstruction Project of Sewage Treatment Facilities in Xibei Village, Shunxi Town, Pingyang County

Project recommendation unit : Ningbo Zhengqing Environmental Engineering Co., Ltd

Project location : Pingyang County, Wenzhou City, Zhejiang Province

Project category : Rural sewage treatment project

Participation link: investment, construction and operation

Project Overview

The project is located in the "Nanyan Town Tourism Functional Area" and "Nanyan Shunxi Qingjie Water Source Protection Area", which is the early demonstration project of "Wubaizhang Water Source Facility Reconstruction Project in Nanyan Town, Pingyang County". The effluent quality is required to meet the first level discharge standard of the Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment Facilities (DB33/973-2015) of Zhejiang Province. The project involves two sewage treatment terminals of 15 tons/day and 5 tons/day in the village. The original terminal treatment process is anaerobic, anaerobic+constructed wetland treatment process, and the effluent quality cannot meet the requirements. Therefore, it is necessary to carry out standard upgrading and transformation, change the original 15 tons/day terminal to 30 tons/day terminal, and transform the original 5 tons/day terminal to lift shaft. Sewage is concentrated in the new 30 tons/day terminal for treatment, The main treatment process adopts the fully buried AAO+MBR membrane treatment process. The effluent is equipped with an ultraviolet disinfection device, and the quality of the effluent can reach the provincial standard level I. The effluent is used for sprinkler irrigation on nearby lawns to achieve "zero discharge" of the effluent.

Project technology process/solution overview

(1) Name and principle of technical process/solution

AAO (anaerobic+facultative+aerobic)+MBR membrane treatment process.

Principle: remove nitrogen, phosphorus and organics in sewage by using the nitrogen and phosphorus removal effect of AAO treatment process, and use MBR membrane instead of sedimentation tank to separate the purified water and activated sludge solid-liquid.

(2) Applicable scope of technical process/solution

1. New residential quarters and large sewage treatment plants;

2. Beautiful villages with high requirements for greening and aesthetics;

3. Reconstruction projects with limited floor space;

4. Areas with strict requirements for effluent quality.

(3) Technical process/solution features and advantages

Features: mature and perfect technology, rich management and operation; The functions are strictly divided to facilitate the management, adjustment and optimization of the treatment process; The treatment effect of organic pollutants is good, especially the biological phosphorus and nitrogen removal effect is obvious, and the effluent quality is stable; Automatic operation is available, but the requirements for automatic control are not high: proper selection of automatic control equipment can optimize the management of the process; Stable operation.

Advantages: good effluent quality; Small floor area; High ammonia nitrogen removal rate; Good phosphorus removal effect; Strong shock load resistance.

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Project name: 32 rural sewage treatment projects in Jindong District, Jinhua City, Zhejiang Province

Project recommended by: Qingdao Ouren Environmental Technology Co., Ltd

Project location: Jindong District, Jinhua City, Zhejiang Province

Project category: Rural sewage treatment project

Participation: Equipment supply

Project Overview

The project is located in Jindong District, Jinhua City, Zhejiang Province. A total of 32 rural sewage treatment stations have been built, with a total daily treatment capacity of 2000m3. The main body of the project adopts 3D-RBC? Three dimensional structure biological turntable equipment. The effluent quality reaches the landmark of Zhejiang Province Level I standard of Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment Facilities (DB33/973-2015).

Project technology process/solution overview

(1) Name and principle of technical process/solution

3D-RBC? Three dimensional structure biological turntable process

The project adopts 3D-RBC? The three-dimensional structure biological turntable technology is mainly composed of pretreatment unit, biological treatment unit and advanced treatment unit. The sewage first enters the pre-treatment unit (grid, regulating tank) to remove sediment and suspended solids, regulate water quality and quantity, and relieve the pressure of subsequent treatment units; Then it enters the biological treatment unit (3D-RBC? Three-dimensional structure biological turntable integration equipment) to remove organic matter, ammonia nitrogen and other major pollutants; The effluent from the biological rotating disc enters the fixed disc filtration part to effectively separate the suspended solids such as the aged biofilm, ensure the stable effluent quality, and finally the effluent is discharged through the wetland up to the standard. With the aid of PAC dosing, the phosphorus removal of the process was strengthened.

(2) Applicable scope of technical process/solution

The technology process is mainly applied to village sewage treatment, community sewage treatment, villa sewage treatment, tourist resort sewage treatment, public service area sewage treatment, school sewage treatment, hospital sewage treatment, black and odorous water body treatment, airport temporary construction area sewage treatment, water source protection area sewage treatment, livestock and poultry breeding wastewater treatment, etc.

(3) Technical process/solution features and advantages

3D-RBC? The three-dimensional structure biological turntable adopts special three-dimensional space structure discs, which effectively increases the specific surface area of discs, enriches the types of biological phases, improves the sewage treatment efficiency of the system, and enhances the operation stability of the system. On the basis of good effluent quality, it also has low operation energy consumption (energy consumption per ton of water is as low as 0.1 kw. h), small floor area, simple maintenance Long service life (the design life of the main equipment is more than 30 years). It can effectively deal with the characteristics of large changes in water quality and quantity in villages and towns and the lack of professional and technical personnel.

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Project name: Sewage Treatment Project in Heshan Town, Rizhao City, Shandong Province

Project recommendation unit : Qingdao Ouren Environmental Technology Co., Ltd

Project location: Heshan Town, Rizhao City, Shandong Province

Project category: Township sewage treatment project

Participation: Equipment supply

Project Overview

The project is located in Heshan Town, Rizhao City, Shandong Province. It mainly treats domestic sewage produced by residents in Heshan Town, with a total daily treatment capacity of 300m3. The main body of the project is 3D-RBC? Three dimensional structure biological turntable equipment. The effluent quality meets the first level standard of the Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment and Disposal Facilities in Shandong Province (DB 37 3693-2019), greatly improving the surrounding water environment.

Project technology process/solution overview

(1) Name and principle of technical process/solution

3D-RBC? Three dimensional structure biological turntable process

The project adopts 3D-RBC? The three-dimensional structure biological turntable technology is mainly composed of pretreatment unit, biological treatment unit and advanced treatment unit. The sewage first enters the pre-treatment unit (septic tank, grid channel, regulating tank) to regulate the water quality and quantity, remove the sediment and suspended solids in the sewage, and relieve the pressure of the subsequent treatment unit; Then enter 3D-RBC? Three dimensional structure biological turntable integrated equipment to remove organic matter, ammonia nitrogen, SS and other major pollutants; Part of the effluent from the three-dimensional structure biological turntable integrated equipment returns to the front-end anoxic tank by gravity, and the denitrifying bacteria use the carbon source in the influent to denitrify the nitrate nitrogen in the raw water and the returned nitrifying liquid, while some phosphorus accumulating bacteria perform anaerobic phosphorus release; The other part of the effluent enters the horizontal subsurface flow constructed wetland for advanced treatment, and the final effluent is discharged to nearby water bodies or reused for farmland irrigation, road dust suppression, etc. after disinfection treatment.

(2) Applicable scope of technical process/solution

The technology process is mainly applied to village sewage treatment, community sewage treatment, villa sewage treatment, tourist resort sewage treatment, public service area sewage treatment, school sewage treatment, hospital sewage treatment, black and odorous water body treatment, airport temporary construction area sewage treatment, water source protection area sewage treatment, livestock and poultry breeding wastewater treatment, etc.

(3) Technical process/solution features and advantages

3D-RBC? The three-dimensional structure biological turntable adopts special three-dimensional space structure discs, which effectively increases the specific surface area of the discs, enriches the types of biological phases, improves the sewage treatment efficiency of the system, and enhances the operation stability of the system. On the premise of ensuring the effluent quality, it also has low operation energy consumption (energy consumption per ton of water is as low as 0.1 kw. h), small floor area, simple maintenance Long service life (the design service life of the main equipment is more than 30 years), etc Point. It can effectively deal with the characteristics of large changes in water quality and quantity in rural areas and the lack of professional and technical personnel.

Photos of plant or main equipment

entry name : Luojing Village Sewage Treatment Station in Baoshan District, Shanghai

Project recommended by: Shanghai Shiputai Film Technology Co., Ltd

Project location: Baoshan District, Shanghai

Project category: Rural sewage treatment

Participation: Equipment supply, installation and commissioning

Project Overview

Luojing Village Sewage Treatment Station in Baoshan District serves 22 households, about 148 people. SUV intelligent modular sewage treatment equipment is adopted, which adopts Germany's advanced SBR sewage treatment technology. The core equipment includes high-efficiency energy-saving plate aeration system and S200 control system.

Treatment scale: 30m3/d

Treatment process: SBR treatment process

Installation type: semi buried

Effluent standard: meet the Class I B standard of Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002).

Project technology process/solution overview

(1) Name and principle of technical process/solution

1) Technical process name

SBR treatment process

2) Process principle

The organic pollutants in water are removed through microbial metabolic activities, and the main functions are decarbonization (removal of COD/BOD) and nitrification and denitrification. There are 6 cycles in total, each cycle is 4h, the reaction time of influent and hypoxia is 40min, the aerobic reaction time is 120min, the sedimentation time is 40min, and the effluent time is 40min.

(2) Applicable scope of technical process/solution

SUV intelligent modular village sewage treatment equipment is suitable for most areas of China, including mountainous, hilly and plain areas. The applicable treatment scale of the equipment is 5~1000 tons/day, and the effluent standards can be selected from Class I B, Class I A and Class IV quasi surface water standards (Class IV quasi surface water standards refer to Class IV surface water standards for all indicators except total nitrogen).

(3) Technical process/solution features and advantages

1) Process characteristics

◆ High effluent standard, stable and up to standard;

◆ High degree of automation, which can realize unattended operation;

◆ It can realize remote monitoring and convenient operation management;

◆ Modular design, compact structure and low floor area.

2) Advantages

◆ Advanced, high reliability

◆ Variety of product types

◆ Expandability of treatment scale and upgrading of effluent standard

◆ Near maintenance free

◆ Economy

◆ In line with national conditions

◆ High standard after-sales guarantee

◆ Ecological benign business model

Photos of plant or main equipment

Project name: Shanghai Jinshan District Wanlian Village 4 # Sewage Treatment Station

Project recommendation unit : Shanghai Shiputai Film Technology Co., Ltd

Project location : Jinshan District, Shanghai

Project category: Rural sewage treatment

Participation: Equipment supply, installation and commissioning

Project Overview

The designed treatment capacity of 4 # Sewage Treatment Station in Wanlian Village, Zhujing Town, Jinshan District is 60m3/d, the number of service users is 122, the floor area is 80m2 (including greening and fence), and the pipe network is 3233.2m long. The main process of the project adopts advanced AO-MBR technology. The collected sewage is lifted by the water collecting well and then flows into the regulating tank. After pre-treatment such as regulating the water quality and quantity in the regulating tank, it flows into the integrated MBR sewage treatment system. The treated water is discharged into the nearby water body after reaching the standard. The surplus sludge is discharged into the sludge tank by air lift, and the sediment in the regulating tank and the sludge in the sludge tank are regularly pumped by the sanitation department and transported out for disposal.

Treatment capacity: 60m3/d

Treatment process: AO-MBR treatment process

Installation type: fully buried

Effluent standard: it meets the Class I A standard in the Interim Provisions of Shanghai on Effluent Quality of Sewage Treatment (Hu Shui Wu [2017] No. 1077).

Project technology process/solution overview

(1) Name and principle of technical process/solution

1) Technical process name

AO-MBR treatment process

2) Process principle

A new sewage treatment process combining membrane separation technology with the biodegradation of activated sludge is adopted to carry out efficient solid-liquid separation through MBR ultrafiltration flat membrane, maintain the microbial concentration of the biochemical system, and ensure high standard effluent quality.

(2) Applicable scope of technical process/solution

SUV intelligent modular village sewage treatment equipment is suitable for most areas of China, including mountainous, hilly and plain areas. The applicable treatment scale of the equipment is 5~1000 tons/day, and the effluent standards can be selected from Class I B, Class I A and Class IV quasi surface water standards (Class IV quasi surface water standards refer to Class IV surface water standards for all indicators except total nitrogen).

(3) Technical process/solution features and advantages

1) Process characteristics

◆ High effluent standard, stable and up to standard;

◆ High degree of automation, which can realize unattended operation;

◆ It can realize remote monitoring and convenient operation management;

◆ Modular design, compact structure and low floor area.

2) Advantages

◆ Advanced, high reliability

◆ Variety of product types

◆ Expandability of treatment scale and upgrading of effluent standard

◆ Near maintenance free

◆ Economy

◆ In line with national conditions

◆ High standard after-sales guarantee

◆ Ecological benign business model

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entry name : Upgrading and Reconstruction Project of Rural Sewage Treatment Station in Dazu District

Project recommendation unit : Yunnan Hexu Environmental Technology Co., Ltd

Project location: Dazu District, Chongqing

Project category: Rural sewage treatment project

Participation: Equipment supply

Project Overview

The rural sewage in Dazu District used to be treated by constructed wetland, which has poor effluent effect and complicated operation and management. The basic demand for domestic sewage treatment and discharge of rural residents can no longer be guaranteed, and sewage discharged into Laixi River will pollute the water environment of Dazu District. The reconstruction covers more than 20 towns and villages, including Zhuxi Town, Zhifeng Street, Jinshan Town, Longshi Town and Gaosheng Town, with a daily treatment capacity of 2680 cubic meters. Our company has supplied a total of 31 BAS integrated sewage treatment equipment. The equipment supply will be completed within 30 days from December 2019 to January 2020, and the water supply conditions for the equipment will be met within 45 days.

Project technology process/solution overview

(1) Name and principle of technical process/solution

Process name: A3/O+MBBR. Process principle: A3/O sewage biochemical treatment process is an overall improvement of the traditional A/A/O (i.e. A2/O) process, optimizing the setting of pre denitration area, anaerobic area, anoxic area and aerobic area with clear functions, adding front end pre denitration area, removing nitrate salt nitrogen carried in the reflux mixture, ensuring an excellent environment for anaerobic phosphorus accumulating bacteria, and improving the biological treatment efficiency of the reaction system, The effect of nitrogen and phosphorus removal is strengthened. In the aerobic zone, high-performance sponge packing with increasing biomass is added to improve the quality and quantity of microorganisms in the reaction system. The filler has good hydrophilicity, fast microbial attachment, and its specific surface area is more than 6 times larger than that of conventional filler. The microbial concentration in the biological reaction system is more than 3 times higher than that of the traditional activated sludge method, achieving the best simultaneous nitrification effect of organic matter degradation, which provides an effective guarantee for denitrification.

(2) Applicable scope of technical process/solution

Scope of application: conventional domestic sewage, river interception, hotels, schools and other sewage centralized discharge points

(3) Technical process/solution features and advantages

1. Strengthen biological nitrogen and phosphorus removal, realize simultaneous nitrification and denitrification, and ensure stable water quality.

   
   

2. Less excess activated sludge, reducing sludge disposal costs.

   
   

3. Low energy consumption, about 0.35kw/h per ton of water.

   
   

4. Small floor area, simple infrastructure, centralized and decentralized treatment combined to save pipe network investment.

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entry name : Zhuji City Zili Village, Yaojiang Town Zishangge Rural Domestic Sewage Treatment Terminal Project

Project recommendation unit : Zhejiang Ediman Environmental Protection Technology Co., Ltd

Project location: Zhuji, Shaoxing, Zhejiang

Project category : Rural sewage treatment project

Participation : Design, installation, operation and maintenance

Project Overview

The project is located in Zishangge, Zili Village, Zhuji City, and is connected to 150 households. The design sewage treatment capacity is 70t/d, the project investment is 670000 yuan, and the subsequent operation and maintenance cost is about 0.45 yuan/ton, mainly for power consumption. A2/O+ecological purification bed+UV disinfection technology is adopted, and the process flow is domestic sewage - grid well - regulating tank - anaerobic tank - anoxic tank - aerobic tank - sedimentation tank - ecological purification bed - disinfection device - effluent. Under the condition that the concentration and quantity of sewage inflow are relatively stable, the effluent quality can reach the first level discharge standard of Zhejiang DB33/973-2015 Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment Facilities through reasonable adjustment of various operating parameters.

Project technology process/solution overview

(1) Name and principle of technical process/solution

The project mainly adopts A2/O+ecological purification bed+ultraviolet disinfection technology process. The process flow is mainly divided into five sections. The first section is the anaerobic area, which flows into the raw sewage and the phosphorus containing sludge returned from the sedimentation tank simultaneously. The main function of this section is to release phosphorus, so that the phosphorus concentration in the sewage increases, and the dissolved organic matter is absorbed by the microbial cells, so that the BOD5 concentration in the sewage decreases; In addition, part of NH3-N is removed due to cell synthesis, which reduces the concentration of NH3-N in sewage, but the content of NO3-N remains unchanged. In the anoxic zone, the denitrifying bacteria use the organic matter in the sewage as the carbon source to bring a large amount of NO3-N and NO2-N into the reflux mixture and reduce them to N2 and release them to the air, so the concentration of BOD5 decreases, the concentration of NO3-N decreases significantly, and the change of phosphorus is very small. In the aerobic zone, organic matter is degraded by microorganisms and continues to decline; The organic nitrogen is ammoniated and then nitrified, which significantly reduces the concentration of NH3-N. However, as the nitrification process increases the concentration of NO3-N, phosphorus also decreases at a faster rate with the excessive uptake of phosphorus accumulating bacteria, which can simultaneously complete the removal of organic pollutants, nitrogen and phosphorus. In the ecological purification bed, pollutants are further adsorbed and degraded through sewage through the ecological purification bed, Further remove organic pollutants, nitrogen and phosphorus, and reduce the indicators of various pollutants. At the same time, the technology of electrocoagulation is integrated into the process to further improve and strengthen the functions of nitrogen removal, phosphorus removal and disinfection through electrocoagulation.

(2) Applicable scope of technical process/solution

The technical process adopted in this project mainly consists of A2/O biochemical tank (or equipment) and ecological purification bed. It is applicable to scattered and small amount of domestic sewage treatment in rural areas and domestic sewage treatment in various hotels, office buildings, living quarters, etc., with a treatment scale of 5-100 tons/day.

(3) Technical process/solution features and advantages

• Multiple tanks are connected in series to meet the actual operation conditions. Diverters and preset valves are set in each tank to control the aerobic and anoxic environment, forming a single-stage A/O or multi-stage A/O series operation mode, improving nitrogen removal efficiency, and reasonably utilizing carbon sources. Equipment can be carried out as required to speed up the project implementation progress.

• The ecological purification bed is added with phosphorus removal filler to strengthen phosphorus precipitation and adsorption and improve phosphorus removal rate.

• Some micro aeration pipes are added to the ecological purification bed to increase the oxygen content of the wetland system and improve the treatment effect of the purification bed. At the same time, the ecological purification bed enhances the long flow and backwash pipe laying system, further improving the sewage treatment effect and blocking prevention effect

• Adding high porosity fillers in the biochemical tank, such as high porosity polyurethane fillers, can effectively reduce the risk of expansion in later operation, improve the efficiency of biochemical treatment, and improve the stability of the system.

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entry name : Sewage Treatment Terminal in Jiming Village, Xiangshan County, Ningbo City, Zhejiang Province

Project recommended by: Zhejiang Fuchun Ziguang Environmental Protection Co., Ltd

Project location : Xiangshan County, Ningbo City, Zhejiang Province

Project category: Rural sewage treatment project

Participation: Investment, construction and operation

Project Overview

The sewage treatment terminal in Jiming Village was completed and put into use in January 2000, benefiting 705 households and 1823 people. The main source of sewage is domestic water. The treatment process of the facility is an ecological reaction chain, with a designed daily treatment capacity of 180 tons/day and an actual daily treatment capacity of 180 tons/day. It is operated according to the Class II standard of Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment Facilities (DB33/973-2015).

Project technology process/solution overview

(1) Name and principle of technical process/solution

The core of the ecological reaction chain technology is the multi-layer and multi-stage biofilm A/O process, which integrates some functions of the ultra deep anaerobic pond, BC method and advanced treatment pond, and completes the pollutant removal (SS, COD, TN, ammonia nitrogen, TP, etc.) and sludge treatment (sludge reduction and stabilization) in an ecological pond.

The biological component of the ecological reaction chain process system consists of multiple food chains to form a complex ecosystem in which various organisms are interdependent and mutually restricted.

In a limited space, the whole process of water self purification is basically simulated through the artificial water ecosystem.

(2) Applicable scope of technical process/solution

At present, it is mainly popularized and used in the vast rural areas where the population is scattered and the sewage cannot be centrally treated on a large scale. The sewage type is mainly domestic sewage, and the daily treatment water volume is about 30 tons/day.

(3) Technical process/solution features and advantages

① The ecological reaction chain system has low load, long residence time, strong resistance to water quality/water volume impact, and stable system operation;

② Small number of equipment, convenient operation and maintenance, simple operation;

③ According to local conditions, the pool body can take an irregular shape, with fewer structures and strong adaptability;

④ The perfect combination of sewage treatment and landscape construction can improve the local water ecological environment, and also provide leisure places and ecological environment publicity and education bases for residents.

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Project name: Hangzhou Lin'an District Rural Sewage Upgrading and Reconstruction and Third Party Operation Guide Village Demonstration Project

Project recommended by: Zhejiang Shuangliang Shangda Environmental Protection Co., Ltd

Project location: Lin'an District, Hangzhou City, Zhejiang Province

Project type: Rural sewage treatment

Participation : EPC+Operation (EPC+O)

Project Overview

In 2017, Lin'an District was the first in Zhejiang to propose the creation of a global village scenic spot. In 2018, we will comprehensively carry out the upgrading of agricultural sewage standards and third-party operation and maintenance work. The project involves about 60000 rural households in Taihuyuan Town and other villages and towns. Zhinan Village is its main demonstration project. The project is located on the bank of Nantiaoxi River, the source of Taihu Lake. It is a water source protection area, with an altitude of nearly 600 meters. It is an ancient village with a history of thousands of years. There are more than 470 mu terraces on the left and right sides of the village, which is known as one of the most beautiful ancient villages in East China.

Shuangliang Shangda is responsible for the implementation of the project, providing the service of "equipment+full scheme", exploring the 4.0 mode of rural sewage treatment in village scenic spots, and comprehensively assisting the creation of the first nationwide village scenic spot.

Introduction to project technology/equipment

(1) Name of technical process/equipment

FBR fermentation tank

(2) Process/equipment principle

At present, the eutrophication of rural sewage is becoming increasingly serious, and the removal of nitrogen and phosphorus has become a key and difficult point. The project adopts the process combining improved A/A/O+fermentation enhancement+ecological filter technology.

The improved A/A/O process is an efficient nitrogen and phosphorus removal technology for wastewater biological treatment. Through the organic combination of multiple microbial populations in the biochemical system, good nitrogen and phosphorus removal effects can be achieved while removing organics.

The typical characteristics of rural sewage are large fluctuation of water quality and quantity and low C/N. The project introduces modern fermentation technology into rural sewage, and uses the fermentation enhancement technology developed by the Academician Workstation of Jiangnan University to enhance the activity of microorganisms in the biochemical system. The use cost increases by about 0.1 yuan/ton. Through enhanced treatment, the impact of changes in water quality, water volume, temperature and other external factors on biological treatment efficiency can be reduced, so as to meet the requirement of 90% compliance rate.

• The domestic sewage of all farmers is collected by the sewage pipe network after passing through the septic tank. Among them, farmhouse sewage is first removed from animal and vegetable oil by oil separator, and then enters into sewage pipe network.

• The domestic sewage collected in the pipe network is separated from the sundries and large particle solids through the grid well, and the slightly larger garbage and sundries are removed to prevent it from entering the subsequent sewage treatment pool and blocking the filler and pipeline.

• The sewage separated by the grid well flows into the regulating tank, making the water quality and quantity entering the biochemical tank more stable.

• The sewage in the regulating tank is lifted into the biochemical tank. After multi-stage and multi-stage biochemical treatment, the sewage enters the sedimentation tank for sludge water separation. The supernatant is discharged after reaching the standard. Part of the settled sludge returns, and the other part of the surplus sludge is discharged to the sludge storage tank for temporary storage, and regularly pumped out for disposal.

• The sewage after treatment in the biochemical tank enters the ecological filter for advanced treatment, which uses the physical, chemical and biological triple synergy of artificial media and microorganisms to conduct advanced treatment of the sewage. The sewage flows into the outfall well by itself, where the effluent is disinfected by chlorine tablets to ensure the stable discharge of sewage up to the standard, and some terminal effluent is reused.

(3) Process/equipment characteristics

The project introduces a new generation of FBR fermentation tank, which is a kind of integrated treatment equipment suitable for domestic rural sewage launched by Shangda Environmental Protection in view of the characteristics of domestic rural sewage with many sundries, high total nitrogen and total phosphorus. The fermentation tank adopts the process combining the composite FRP technology and the improved A/A/O+fermentation strengthening technology, which can improve the construction speed and ensure that the effluent is stable and up to standard.

Useful - stable up to standard: the process combining the improved A/A/O+fermentation enhancement technology explored by Shangda for 15 years is adopted to solve the industrial problem of phosphorus and nitrogen removal under the environment of low carbon nitrogen ratio, and the enhanced effluent meets the surface quasi Class IV water standard.

Durable - long service life: the equipment adopts composite FRP materials and processes, and takes full consideration of maintenance issues. The design service life of the product is 30 years. It can be installed on the ground or underground, and has strong adaptability to the extensive construction and use environment in rural areas.

Easy to use - management intelligence: FBR fermentation tank adopts Shangda Fuxi cloud platform for remote management. The platform has managed 20000 sites nationwide, with high maturity and stability. Operation and maintenance personnel can realize remote control, monitoring and capturing through mobile phones.

Applicable - economical: The investment and operation cost of FBR fermentation tank is moderate, and the average investment cost per household is 1000-3000 yuan, which is suitable for the economic conditions in rural areas. Compared with membrane equipment, regular cleaning and replacement are not required.

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Project name: Rural residential environment improvement in Pukou District - construction, operation, maintenance and handover of rural domestic sewage treatment project

Project recommended by: CSCEC Water Environmental Protection Co., Ltd

Project location : Pukou District, Nanjing, Jiangsu Province

Project category: Rural sewage treatment project

Participation: EPC and operation

Project Overview

The project is located in Pukou District. It is proposed to comprehensively treat the rural domestic sewage in 532 natural villages in Pukou District, involving five streets in total, namely, Jiangpu Street, Xingdian Street, Qiaolin Street, Tangquan Street and Yongning Street. The main contents of the project include: household outlet pipe (discharge pipe), household connection well, septic tank, sediment grid well, drainage pipe connecting water facilities, village sewage pipe network, lift pump station, centralized sewage treatment station and supporting landscape, decentralized sewage treatment facilities, village hardening and road restoration, construction of operation and maintenance center, construction of intelligent operation platform, etc. The construction period of the project is one year, the operation period is 14 years, the number of service households is more than 32000, and the beneficiary population is more than 100000.

Project technology process/solution overview

Sewage is collected by black ash separation method, that is, kitchen, bath and toilet septic tank drainage are collected separately, in which an oil well is set at the kitchen drainage outlet, and the sewage is collected by pipes and flows to the sewage treatment station, and a lift pump station is added in low-lying areas; The sewage treatment station adopts the whole buried integrated treatment process. The main process is the regulation pretreatment+biological contact oxidation process. The sewage enters the regulating tank first, then enters the biochemical treatment unit after pretreatment, and then flows into the sedimentation unit and then discharges into nearby water bodies after reaching the standard. The main equipment (water pump, air pump, etc.), components, etc. in the sewage treatment station are all imported brands; The processing station is equipped with a video monitoring system. The operating conditions and frequency information of the equipment in the processing station can be transmitted to the operation and maintenance monitoring center through the intelligent gateway in the electric control cabinet. Supported by big data, cloud computing, the Internet of Things and other technologies, the intelligent operation and maintenance of rural sewage treatment is realized.

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