The purification tank is mainly composed of a regulating sedimentation zone, an anoxic zone, an aerobic zone, and an effluent zone. The anoxic and aerobic zones are filled with fillers, and functional microorganisms are attached to the fillers.(1) Adjusting the sedimentation zone can regulate water fluctuations and remove impurities and suspended solids through interception and sedimentation;
(2) The anoxic zone can remove organic matter and achieve denitrification;
(3) Further removal of organic matter and removal of ammonia nitrogen through nitrification in the aerobic zone;
(4) Chlorine disinfection is added to the effluent area.