1, septic tank
Septic tank (huàfènchí) refers to the treatment of feces and filtering precipitation equipment. The principle is that the solidified material in the bottom of the pool decomposition, the upper layer of hydrated objects, into the pipeline flow away, preventing the clogging of the pipeline, to the solidified objects (feces and other waste) have enough time to hydrolyze. Septic tank (septic tank) refers to the domestic sewage compartment precipitation, and anaerobic digestion of sludge small treatment structures.
2, primary sedimentation tank
Wastewater treatment for the removal of sediment and floating structures. Wastewater after primary sedimentation, about 50% of removable sediments, oil and grease and floating matter, 20% of BOD, according to the removal of unit mass BOD or solids, the primary sedimentation tank is the most economically economical purification steps for domestic sewage and suspended solids of industrial wastewater is easy to use the primary sedimentation tank pre-treatment.
3, two sedimentation tank
Often the biological treatment of sedimentation tank called two sedimentation tank or final sedimentation tank (final sedimentation tank). The role of the second sedimentation tank is to separate mud and water, so that the mixture of liquid clarification, sludge concentration and the separation of sludge back to the biological treatment section.
4, regulating pool
This refers to the structure used to regulate the flow of water inlet and outlet. In the hydroelectric power plant, is a certain volume of regulation to adapt to the hydroelectric power plant load changes in the pool; in the wastewater treatment plant, in order to make the pipeline and the normal work of the structures, not affected by the peak flow or concentration of wastewater changes, the need for wastewater treatment facilities set up before the pool.
To regulate the inlet and outlet water flow structure. Mainly on the water quantity and quality of water regulation, as well as the pH value of sewage, water temperature, there is a pre-aeration of the regulatory role, can also be used for accidental drainage.
5, anaerobic pool
Anaerobic reactor, raw sewage and phosphorus return sludge discharged from the sedimentation tank into the same time, the main function of this reactor is to release phosphorus, while part of the organic matter for ammonia.
Relation
The sewage after sand-water separation enters into the primary sedimentation tank, and the above is the primary treatment (i.e. physical treatment), and the effluent from the primary sedimentation tank enters into the biological treatment equipment, with activated sludge method and biofilm method, (among them, the reactors of activated sludge method are aeration tank, oxidation ditch, etc., and the biofilm method includes biofilter, bio-turntable, bio-contact oxidization and bio-fluidized bed), and the biological The effluent from the treatment equipment enters the secondary sedimentation tank,
The effluent from the secondary sedimentation tank is discharged after disinfection or enters the tertiary treatment, the end of the primary treatment to this for the secondary treatment, the tertiary treatment includes biological nitrogen and phosphorus removal, coagulation and sedimentation, sand filtration, adsorption of activated carbon, ion exchange and electrodialysis method. Part of the sludge from the secondary sedimentation tank is returned to the primary sedimentation tank or biological treatment equipment, and part of it enters the sludge thickening tank, and after that it enters the sludge digesting tank, and after the dewatering and drying equipment, the sludge is finally utilized.
Expanded Information
Categorized by the source of sewage, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production wastewater includes industrial wastewater, agricultural wastewater, and medical wastewater, etc., while domestic wastewater is the wastewater produced by daily life, refers to various forms of inorganic and organic matter of complex mixtures, including: floating and suspended solid particles of various sizes; colloidal and gel-like diffusers; and pure solutions.
By the qualitative nature of water pollution, water pollution has two categories: one is natural pollution; the other is man-made pollution, the current harm to the water body is more man-made pollution. Water pollution can be divided into chemical pollution, physical pollution and biological pollution according to the different impurities of pollution. Pollutants are:
The untreated industrial wastewater discharged; untreated sewage discharged; the use of large quantities of fertilizers, pesticides, herbicides, farmland sewage; piled up in the river industrial waste and domestic garbage; soil erosion; mine sewage.
Baidu Encyclopedia-Septic Tank
Baidu Encyclopedia-Primary Sedimentation Tank
Baidu Encyclopedia-Secondary Sedimentation Tank
Baidu Encyclopedia-Regulating Tank
Baidu Encyclopedia-AAO Method
Baidu Encyclopedia-Sewage Treatment