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This project is a sewage treatment plant under the North Control Water Group, with a daily processing capacity of 20000m 3/d. The single 2-group magnetic coagulation sedimentation tank system is delivered by New Environmental Protection, including process equipment, process instruments, control systems, pipeline cable materials, etc., including mixers, sludge scrapers, magnetic powder recovery machines, high-speed shear machines, sludge pumps, electromagnetic flow meters, liquid level meters, regulating valves, electrical control and self-control cabinets, etc. After debugging, the magnetic coagulation sedimentation tank of the project degraded from influent water quality SS ≤ 50mg/L and TP ≤ 3.0mg/L to SS ≤ 10mg/L and TP ≤ 0.3mg/L, and met the standard stably after system operation.