Physiochemical and biochemical interactive city sewage treating method

The present invention belongs to the field of environmental technology, in particular to a wastewater treatment BIOCHEMICAL interactive method. Preanoxic provided by the present invention in a reactor of anaerobic, anoxic, aerobic biological treatment unit and the like be added for physico-chemical treatment unit flocculant, physicochemical biological treatment unit can be used in different operating modes, in accordance with different variations and processing requirements of the water quality of the water changed reaction conditions in each unit, operating in series or parallel to achieve biological and physico-chemical treatment systems, always at the lowest operating cost, effective removal of organic pollutants, suspended solids, nitrogen , phosphorus and other nutritional substances, to ensure that meet emission requirements.