Small buried sewage in school Water treatment equipment price
Pretreatment of school domestic sewage treatment equipment: the dining wastewater in the canteen needs to be treated by oil separation. After mixing, the sewage is treated in the septic tank. After mixing, the effluent from the septic tank is filtered through the grid and enters the regulating tank to regulate the water volume.
Biochemical treatment: In view of the good biochemical property, there are many optional processes, such as A2O, A/O, etc. Considering the economic practicality, it is recommended to use A/O process. Biochemical effluent can generally meet the Class I B standard, and some can meet the Class I A standard.
Price of small underground sewage treatment equipment in school Main process description:
Sewage from drainage system After collection, it will enter the septic tank of the sewage treatment station to anaerobic decompose the feces and macromolecular organics, and then enter the regulating tank for homogenization and equalization. A level controller will be set in the regulating tank, and then the signal will be transmitted through the level controller pump It is sent to the anaerobic tank of the integrated equipment and flows into the disinfection tank for disinfection treatment after aerobic treatment. The disinfection effluent is directly discharged into the municipal pipe network.
The sundries intercepted by the grating are regularly loaded into the trolley and dumped to the garbage dump. The sludge in the integrated sedimentation tank is discharged into the septic tank for sludge digestion and then pumped out regularly. The supernatant of the sludge tank returns to the regulating tank for further treatment.
Price of small underground sewage treatment equipment in school Process principle:
A/O process is a kind of wastewater biological treatment method derived from biofilm method, that is, a certain amount of filler The organic matter in the wastewater is oxidized and decomposed through biological oxidation by using the biofilm perched on the filler and fully supplied oxygen to achieve the purification purpose.
The process connects the front anoxic section and the rear aerobic section together, and heterotrophic bacteria in the anoxic section hydrolyze the soluble organic matter in the sewage into organic acids, so that the macromolecular organic matter can be decomposed into small molecular organic matter, the insoluble organic matter can be converted into soluble organic matter, and the protein, fat and other pollutants can be ammoniated (N on the organic chain or amino acid in the amino acid) to free ammonia (NH3, NH4). There are aerobic microorganisms and self oxidizing bacteria (nitrifying bacteria) in the aerobic section, in which aerobic microorganisms decompose organics into CO2 and H2O; Under the condition of sufficient oxygen supply, the nitrification of autotrophic bacteria oxidizes NH3-N (NH4) to NO3 -, and returns to the anoxic section through reflux control. Under the anoxic condition, the denitrification of heterotrophic bacteria reduces NO3 - to molecular nitrogen (N2) to complete the circulation of C, N, and O in the ecology, and realize the harmless treatment of sewage.
Price of small underground sewage treatment equipment in school The equipment consists of six parts:
(1) Primary sedimentation tank The primary sedimentation tank is a vertical flow sedimentation tank. The rising velocity of sewage in the sedimentation tank is 0.6-0.8mm/s, and the settled sludge is lifted to the sludge tank with air.
(2) The water after primary sedimentation in contact oxidation tank flows automatically to contact tank for biochemical treatment. The contact pool is divided into three levels, with a total retention time of 4 hours. The filler is honeycomb and semi soft composite filler, which is easy to conjunctiva and does not block the conjunctiva. The gas water ratio of the contact tank is about 12:1.
(3) Secondary sedimentation tank. After biochemical treatment, the sewage flows to the secondary sedimentation tank, which is a vertical flow sedimentation tank with a rising velocity of 0.3-0.4 mm/s. The settled sludge is lifted to the sludge tank with air.
(4) Disinfection pool The disinfection pool is 30 minutes according to the standard of "GBJ48-83". If the hospital sewage, the disinfection pool can increase the retention time of 1-1.5 hours. The disinfection device is restructured with reference to foreign data. It can continuously change the dosage according to the size of the water output. For the purpose of adding more water and more medicine, less water and less medicine, chlorine cake is used as the dosage.
(5) All sludge in the primary sedimentation tank and secondary sedimentation tank of the sludge tank is automatically discharged into the sludge tank for aerobic digestion. There is little residual sludge after digestion. Generally, it only needs to be transported out 1-2 times a year by a septic truck.
(6) Fan room The fan room is set under the disinfection pool, and the entrance of the machine room adopts double compartments door There is * * * at the air inlet, so there is basically no noise during operation. Two fans are selected, one for standby and one for use.
When carrying out the special audit of township sewage treatment plants, Xiangyang Municipal Audit Bureau focused on the central, provincial and municipal decisions and work requirements on promoting the integration of economic and social development and green transformation, focused on the construction and operation of township domestic sewage treatment projects, revealed the problems in the operation and management of sewage treatment facilities and supporting pipe networks, and analyzed the causes, Promote the orderly operation of sewage treatment projects and help improve the living environment of villages and towns.
