Small rural buried domestic sewage Water treatment equipment device
According to the above water quantity and quality, we must follow the following ideas when considering the selection of sewage treatment process: 1. The general idea is to use a mature and reliable A/O biological contact oxidation process as the treatment process, supplemented by physical and chemical treatment means such as grid interception, sedimentation tank clarification, disinfectant disinfection, etc;
Small rural buried domestic sewage treatment equipment Firstly, the sewage is pretreated by intercepting it with a mechanical grid, in order to initially reduce the content of inorganic particles and improve the identity and biodegradability of the sewage; Then, through the anoxic aerobic A/O biological contact oxidation method, the organic pollutants are first converted into ammonia nitrogen by using the role of biofilm, and at the same time, both organics and ammonia nitrogen are removed through the aerobic nitrification and anoxic denitrification processes. Biochemical tank is equipped with new high-density elastic solid filler The filler has the advantages of high load, simple construction, small volume, stable and reliable operation, convenient management, convenient maintenance and replacement, etc; The effluent from the biochemical tank enters the horizontal flow sedimentation tank for solid-liquid separation. The horizontal flow sedimentation tank is characterized by good solid-liquid separation effect, low investment, strong adaptability to temperature changes, simple construction, etc;
Small rural buried domestic sewage treatment equipment Buried domestic sewage treatment equipment is mainly designed for the treatment of domestic sewage and similar industrial organic sewage. The main treatment method is to use the relatively mature biochemical treatment technology - contact oxidation method. The water quality parameters are based on the general domestic water quality BOD 20Omg/l , water outlet BOD 20mg/l Index design consists of six parts: (1) Primary sedimentation tank; (2) Contact oxidation tank; (3) Secondary sedimentation tank; (4) Disinfection pool and disinfection device; (5) Sludge tank; (6) Fan room and fan;
The underground domestic sewage treatment equipment is described as follows:
(1) Primary sedimentation tank: the primary sedimentation tank of buried domestic sewage treatment equipment is a vertical flow sedimentation tank, and the rising velocity of sewage in the sedimentation tank is 0.6-0.7 millimeter / Second, the precipitated sludge is lifted to the sludge tank with air. (Note: WSZ-A O.5-5m3/h No primary sedimentation tank)
(2) Contact oxidation tank: after primary sedimentation, the water flows automatically to the contact tank for biochemical treatment. The contact tank is divided into three stages, and the total residence time is one More than hours. The contact oxidation time of enhanced equipment can reach six The packing is a new trapezoidal packing. Easy to conjunctiva, not blocked. The specific surface area of filler is 160m2/m3 , the gas water ratio of contact tank is 12:1 about. (Note WSZ-A 0.5-5T/h , contact tank is secondary)
(3) Secondary sedimentation tank: the sewage after biochemical treatment flows to the secondary sedimentation tank. The secondary sedimentation tank is two vertical flow sedimentation tanks, which operate in parallel. The rising flow rate is O.3-0.4 millimeter / Seconds. The sludge is lifted to the sludge tank by air. (Note WSZ — A0.5-5mT/h , sludge flows into sludge tank automatically)
(4) Disinfection tank and disinfection device: Disinfection tank according to specifications:“ TJI4 — seventy-four ”The standard is thirty Minutes, if it is hospital sewage, the disinfection pool can increase the retention time to 1-1.5 The disinfection method of contact dissolution of solid chlorine tablets is adopted, and the disinfection device can continuously change the dosage according to the size of the water output, so as to achieve the purpose of adding more medicine to more water and less medicine to less water. Other disinfection devices can be prepared separately. (Note : If it is used for industrial sewage disinfection pool and disinfection device, it can not )
(5) Sludge tank: all sludge in primary sedimentation tank and secondary sedimentation tank is lifted to WSZ-A Aerobic digestion is carried out in the sludge tank of. The clear liquid from the sludge tank returns to the contact oxidation tank for further treatment. There is little residual sludge after digestion, generally 1-2 Clean up once a year. The cleaning method can be to use a septic truck to stretch into the bottom of the sludge from the inspection hole of the sludge tank, and then pump and transport the sludge outside. （ WSZ-A 0.5-5T/h , sludge adopts anaerobic digestion)
(6) Fan room and fan: WSZ-A The fan room of the buried domestic sewage treatment equipment is located above the disinfection pool. The inlet adopts double-layer sound insulation. The air inlet has * * * and fan filter, so there is no noise during operation. Two fans are used L Type Roots blower can automatically operate alternately. Operation life of single fan thirty thousand About hours.
Small rural buried domestic sewage treatment equipment "Since 2021, we have started to carry out special testing and drainage of domestic sewage treatment in 57700 natural villages across the province, and since last year, we have carried out regular and full coverage spot checks and assessments." The relevant person in charge of the Provincial Department of Ecological Environment introduced that the "crux" that restricts the treatment of rural domestic sewage in Guangdong was finally identified: insufficient factor guarantee, extensive technical lines, and low level of systematic planning.
