Small domestic sewage in villages and towns Water treatment equipment countryside
Water quality analysis of rural domestic sewage: rural domestic sewage is characterized by large amount of water, concentrated drainage, high COD concentration, and many impurities and suspended solids. On the one hand, untreated domestic sewage flows into low-lying rivers, lakes, ponds and other surface water bodies, seriously polluting various water sources; On the other hand, domestic sewage is also the source of disease transmission and spread, which is easy to cause the occurrence and prevalence of infectious diseases, endemic diseases and zoonotic diseases in some areas. The random discharge of domestic sewage has seriously polluted the rural ecological environment, directly threatening the health of farmers and rural economic development. When the domestic sewage treatment equipment is used to treat sewage, the domestic sewage flows into the aeration area from the top of the device. The aerator aerates the sewage underwater and pushes the flow to stir the sewage. The incoming sewage will soon be fully mixed with the original mixed liquid to adapt to the changes in the incoming water quality to a large extent; Through the dual functions of water flow promotion and underwater aeration, the aerator enables the sewage in the aeration area to circulate regularly, and improves the dissolved oxygen content in the sewage. Through the dual functions of water flow promotion and underwater aeration, the aerator makes the sewage in the aeration area circulate regularly and increases the dissolved oxygen content in the sewage.
Small domestic sewage treatment equipment in villages and towns Rural The integrated sewage treatment device is based on the anoxic aerobic A/O biological contact oxidation process. The device adopts the contact oxidation method, and consists of six parts: primary sedimentation tank, contact oxidation tank, secondary sedimentation tank, disinfection tank, sludge tank, and fan.
A. Regulating tank (steel concrete structure, building construction)
Due to the low elevation of incoming water, it is impossible to directly flow into the buried domestic sewage treatment equipment, so a water collecting regulating pool is added in front of the biochemical integration equipment. Two diving lifts are installed in the water collecting lift pool pump And lift the wastewater in the water collecting lift tank to the integrated sewage treatment equipment. The regulating tank also plays the role of homogenizing water quality and quantity.
B. Grille
The wastewater from the regulating tank is pumped to the grid of the integrated sewage treatment equipment by the lift pump, and the grid intercepts various floating substances in the sewage. To prevent blocking the subsequent water pump or treatment equipment; Avoid sedimentation in the subsequent pool and increase the maintenance frequency. Grid specification: 1000mm * 500mm (length * width), grid clearance 6mm.
C. Biological contact oxidation tank (including primary oxygen tank and secondary oxygen tank)
In the biological contact oxidation tank, the air blower and microporous aerator are used to continuously supply oxygen to the sewage, and aerobic microorganisms are used to oxidize the organic matter, so that the COD and BOD in the sewage are greatly reduced, and then reach the discharge standard
Specification of primary contact oxidation tank: 2.4m × 4.0m × 2.5m (length × width × height) Specification of secondary contact oxidation tank: 1.2m × 4.0m × 2.5m (length × width × height)
The bottom of the primary contact oxidation tank and the secondary contact oxidation tank are equipped with microporous aerators, with microporous aeration specification of Φ 215mm.
Two blowers are installed in the equipment room to supply air to the contact oxidation tank. Blower power: 2.2kw.
D. Sedimentation tank
The biochemical sewage flows into the sedimentation tank, and the suspended solids in the sewage settle at the bottom of the tank. The clarified sewage flows out from the overflow weir at the other end of the sedimentation tank. The sludge accumulated in the sedimentation tank returns to the contact oxidation tank through the sludge pump. The sedimentation tank is in the form of inclined plate sedimentation tank to increase the sedimentation effect and ensure the effluent quality.
E. Sludge tank
The sludge at the bottom of the sedimentation tank enters the sludge tank under the action of gravity, and the sludge in the sludge tank is regularly returned to the primary biological contact oxidation tank by the sludge pump, which not only ensures the sludge volume of the biochemical tank, but also can aerobic digest some of the sludge.
F. Clean water disinfection tank
The disinfection tank receives overflow water from the sedimentation tank. Add sodium hypochlorite solution into the disinfection tank to kill the remaining coliform and other toxic and harmful microorganisms in the treated water, so as to ensure the safety of the effluent.
G. Disinfection dosing device
The disinfection and dosing device consists of a dosing bucket and a dosing pump. The dosing bucket is filled with diluted sodium hypochlorite solution with a concentration of about 10%. The dosing pump is an electromagnetic diaphragm Metering pump The frequency of the electromagnetic diaphragm metering pump of the pool can be adjusted to add an appropriate amount of disinfectant into the disinfection pool.
Small domestic sewage treatment equipment in villages and towns Rural Primary treatment of domestic sewage refers to the process of removing some suspended solids and organic matter through grids or sedimentation tanks. Through primary treatment, suspended solids, biochemical oxygen demand（ BOD ）And bacteria can generally be reduced fifty %Left and right. Add some chemical or microbial flocculants and lime It can accelerate the sedimentation of suspended substances (strengthen primary treatment). Biochemical treatment of rural domestic sewage treatment equipment Biochemical treatment of rural domestic sewage is a traditional secondary sewage treatment that generally uses biochemical technology. The purpose of secondary treatment is to use the oxidation of various bacteria or fungi in sludge to destroy the structure of organic matter and further reduce the BOD 。 If anaerobic treatment technology is adopted, the organic matter in sludge can produce biogas under the action of anaerobic bacteria. Secondary treatment using activated sludge technology can reduce the number of bacteria to ten ％。
Small domestic sewage treatment equipment in villages and towns Rural As a city named after a river, Jinjiang is actually a "better poor water area". The annual per capita water resource is 130 cubic meters, which is only 6.2% of the national average. More than 80% of the city's water needs to be diverted from outside. Therefore, for Jinjiang River, it is particularly important to ensure water supply, and the realization of reclaimed water reuse through sewage treatment is more far-reaching for realizing water resource recycling and promoting environmental protection.
