9/20/2024
When sewage enters the plant, it first passes through ① interception well (allowing sewage that can be treated to enter the plant for treatment), enters ② coarse screen (salvage larger slag), to ③ sewage pump (raising the height of sewage), to ④ fine screen (salvage smaller slag), to ⑤ sedimentation tank (based on gravity separation, the inorganic particles with larger specific gravity of sewage are precipitated and removed), to ⑥ biochemical tank (using activated sludge method to remove BOD5, SS and various forms of nitrogen or phosphorus in sewage), enters ⑦ final sedimentation tank (remove excess sludge and return sludge), and enters ⑧D filter Pool (further reduce SS, so that the effluent reaches the national first-level standard) enters ultraviolet disinfection ⑨ (kills E. coli in the water) and then ⑩ effluent biochemical pool, part of the sludge out of the final sedimentation tank is used as the return sludge of the biochemical pool, and the rest is sent to the sludge dehydration room for dehydration and transportation. There are mainly physical treatment methods, biochemical treatment methods, and chemical treatment methods. Biochemical treatment methods are often used. The mainstream treatment method mainly depends on the quality of the treated water and the conditions of the receiving water body. The mainstream treatment method for general urban domestic sewage is biochemical treatment, such as the activated sludge method, mbr, and other methods.
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