Small domestic sewage in villages Water treatment equipment offer
Overview of domestic sewage treatment equipment and technology Domestic sewage refers to the waste water discharged by residents in their daily life. It mainly comes from residential buildings and public buildings, such as residential buildings, government offices, schools, hospitals, shops, public places and industrial enterprise toilets. Domestic sewage contains a large number of organic substances (such as protein, carbohydrate, fat, urea, ammonia nitrogen, etc.) and a large number of pathogenic microorganisms (such as parasitic eggs and intestinal infectious diseases, etc.). The organic matter in the domestic sewage is very unstable, easy to decay and produce odor. Bacteria and pathogens multiply in large quantities with organic substances in domestic sewage as nutrition, which can lead to the spread of infectious diseases. Therefore, domestic sewage needs to be treated before discharge.
Quotation of small domestic sewage treatment equipment in villages Process description
WSZ-A equipment is mainly designed to treat domestic sewage and similar industrial organic sewage. Its main treatment method is to use the currently mature biochemical treatment technology - biological contact oxidation method. The water quality parameters are calculated according to the design of general domestic sewage quality, with BOD5 average 200mg/l and effluent BOD5 average 20mg/l. There are six parts in total: (1) primary sedimentation tank (2) contact oxidation tank (3) secondary sedimentation tank (4) disinfection tank, disinfection device (5) sludge tank (6) fan room, fan.
The timely quotation of buried integrated sewage treatment equipment generally adopts natural film hanging. Compared with sewage treatment, the species and quantity of biofilm organisms are not very rich, but various microorganisms such as microbial micelles, protozoa, free bacteria and so on are growing, and the ecological situation is good. The biofilm is brownish black and gray. The microbiota is composed of capsulococcus. The protozoa include micro ciliates, sometimes bell worms, rotifers, dendrites, etc; Metazoan nematode, etc. There is algae symbiosis, and the biofilm at the inlet end is better developed than that at the outlet end. The biofilm development of all types of treatment equipment is similar with little difference. To judge whether the biofilm is mature or not, the removal rate of NH3-N or OC can be measured. When their removal rates are 75% or 15% respectively, it is considered that the biofilm is successfully formed. Table 2 shows that the time required for film formation is positively correlated with the water temperature. When the water temperature is 20 ℃, it takes about 18 days; When the water temperature drops by 10 ℃, the time required shall be doubled at least.
Quotation of small domestic sewage treatment equipment in villages The equipment can be buried below the ground, and the ground can be used for greening or plaza, so the equipment does not occupy the ground area, does not need to build a house, and does not need heating and insulation. In addition to conventional blower noise reduction measures (such as heat insulation, silencer, etc.), new sound absorption materials are also set on the inner wall of the blower, so that the noise of the equipment during operation is less than 50 dB, reducing the impact on the surrounding environment. The equipment is equipped with a full-automatic electrical control system, and the equipment damage alarm system is reliable. Therefore, there is no need for special personnel to manage the equipment at ordinary times, only monthly and quarterly maintenance is required.
The equipment is composed of a secondary tank for sewage treatment, which is made of steel structure or Glass Steel structure with shallow burial depth. The steel structure pool is treated with domestic FRP anti-corrosion treatment, and the anti-corrosion life can reach 20 years. In sewage treatment, the AO biological treatment process of the equipment adopts the push flow biological contact oxidation tank, which is superior to the fully mixed type or the two-stage and three-stage tandem fully mixed type. In addition, it is smaller than the activated sludge tank, has strong adaptability to water quality, good impact resistance, stable water quality and no sludge bulking.
Quotation of small domestic sewage treatment equipment in villages At the same time, a new elastic solid is used in the biological pool filler It has a large actual specific surface area, and it is convenient for microorganisms to hang and remove the membrane. Under the same organic load conditions, it has a higher rate of organic matter than other fillers, and can improve the solubility of oxygen in air in water. Since the biological contact oxidation tank is used in A0 biological treatment process, the volume load of the filler is relatively low, and the microorganism is in the stage of digestion, so the sludge production is less. In addition, the water content of sludge produced by biological contact oxidation tank is far lower than that produced by activated sludge tank. Therefore, the sludge generated by the sewage sweat treatment equipment is less, which generally only needs to be discharged once every 90 days.
In terms of carrying out technical assistance regularly, Guangdong has set up a pool of people related to rural domestic sewage treatment to strengthen training and guidance in many aspects. At the same time, the provincial technical team was prepared to carry out the on-site assessment of village governance, investigate and assess the governance effectiveness, operation and maintenance, and public satisfaction. We also strengthened financial security, coordinated and promoted the provincial finance to clarify that in 2023, no less than 20% of the provincial funds for helping villages and towns in towns will be used for rural domestic sewage treatment in principle.
