The main treatment process includes regulating tank, primary defluorination tank, secondary defluorination tank, primary denitrification tank, primary sedimentation tank, AO treatment tank, secondary sedimentation tank, and discharge outlet

A sewage treatment plant in a certain city is designed with a capacity of 50000 m3/d, but the actual operating water volume is around 40000 m3/d. In summer, some seafood water is mixed in.

The effluent COD of yueyang Pulp and Paper Wastewater Treatment Plant is 351mg/L and the chromaticity is 100 times, which fails to meet the discharge standards of water pollutants in the pulp and paper industry GB 3544-2008 Table 2, COD≤80mg/L， The standard for chromaticity is ≤ 50 times.

The total phosphorus content of the sewage treatment plant in Jingshan City after biochemical treatment is 1.13mg/L. When PAC was originally used and the dosage was 80mg/L, the total phosphorus in the effluent was 0.55mg/L, which did not meet the Class A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB 18918-2002, with a total phosphorus discharge standard of 0.5mg/L.