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Biological contact oxidation, water quality parameters in general design and calculation of sewage quality, average BOD5 200mg/1 effluent BOD5 20mg/1 design. There are six parts, 

(1) the primary sedimentation tank (2) contact oxidation tank (3) secondary clarifier (4) disinfectant pool disinfection device (5) sludge pond (6) fan room, fan.