Anaerobic reactor, raw sewage and phosphorus-containing reflux sludge discharged from sedimentation tank enter simultaneously. The main function of this reactor is to release phosphorus and ammoniate some organic matter at the same time.

relationship

Sewage separated from sand and water enters the primary sedimentation tank, which is primary treatment (i.e. physical treatment). The effluent from the primary sedimentation tank enters biological treatment equipment, including activated sludge process and biofilm process (the reactors of activated sludge process include aeration tank and oxidation ditch, etc.). Biofilm method includes biological filter, biological rotary table, biological contact oxidation method and biological fluidized bed), and the effluent from biological treatment equipment enters the secondary sedimentation tank.

The effluent from the secondary sedimentation tank is discharged after disinfection or enters the tertiary treatment, and the primary treatment ends here as the secondary treatment. The tertiary treatment includes biological nitrogen and phosphorus removal, coagulation and sedimentation, sand filtration, activated carbon adsorption, ion exchange and electrodialysis. Part of the sludge in the secondary sedimentation tank flows back to the primary sedimentation tank or biological treatment equipment, and part of it enters the sludge concentration tank and then enters the sludge digestion tank. After dehydration and drying equipment, the sludge is finally utilized.

Extended data

According to the classification of sewage sources, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production sewage includes industrial sewage, agricultural sewage and medical sewage, while domestic sewage is sewage produced in daily life, which refers to a complex mixture of inorganic substances and organic substances in various forms, including: floating and suspended solid particles; Colloidal and gelatinous diffusers; Pure solution.

According to the quality of water pollution, there are two types of water pollution: one is natural pollution; The other is man-made pollution, which is harmful to water bodies at present. Water pollution can be divided into three categories: chemical pollution, physical contamination and biological pollution. Pollutants mainly include:

Industrial wastewater is discharged without treatment; Domestic sewage is discharged without treatment; Farmland sewage that uses a lot of chemical fertilizers, pesticides and herbicides; Industrial garbage and domestic garbage piled up by the river; Soil erosion; Mine sewage.