Sewage through the grille into the control tank after the lift pump into the bioreactor, through the PLC controller to open the aeration machine oxygenation, bioreactor effluent through the circulation pump into the membrane separation processing unit, concentrated water back to the regulation pool, membrane separation of water After rapid mixing of chlorinated disinfection (sodium hypochlorite, bleaching powder, chlorine tablets), into the water storage tank. The backwashing pump utilizes the treatment tank in the wash basin to backwash the membrane treatment equipment and recoil the sewage back to the conditioning tank. The opening and closing of the pump is enhanced by the water level control in the bioreactor. Membrane unit filtration and backwash operation can be automatically or manually controlled. When the membrane unit requires chemical cleaning operation, close the inlet valve and the sewage circulation valve, open the drug washing valve and the medicine circulation valve, start the liquid circulation pump, carry on the chemical cleaning operation.