Process and basic methods of sewage treatment

The concentration of organic pollutants in domestic sewage is low, and the BOD5/CODcr of sewage is ≥ 0.45. The treatment process can be mainly biochemical treatment, and A/ O process can be selected. Biochemical tank should be divided into two parts: A-class tank and O-class tank. The sewage lift pump lifts the wastewater to the anaerobic tank, and the organic matter is hydrolyzed and acidified under the action of anaerobic bacteria to remove the organic matter in the wastewater and improve the biodegradability of the wastewater. The effluent from the anaerobic tank enters the aerobic tank, and the oxidation tank is blown and aerated for nitrification, phosphorus absorption and BOD (or COD) removal. Mud and water are separated in the secondary sedimentation tank, and the effluent is disinfected by a disinfection device and discharged after reaching the standard. Sewage meets the standard