ends the outlet control valve is opened to drain dirty wash water into the flocculation container a main control panel adds a certain amount of flocculate into the flocculation container through a flocculant dispenser according to a set program after standing for a period of time the flocculate will condense dirt in the flocculation container into large particles to float in the container and the bottom is treated clean water after the flocculation ends the stop valve on off control structure is opened the clean water in the flocculation container will enter into the filter container the strainer in the filter container will block the flocculate and the dirt outside the strainer and the clean water will be driven by the circulating pump at the bottom into the outer drum 2 again to continue the rinsing the flocculation and filter processes are repeated once to three times and stop until a turbidity sensor detects that the wash water in the outer drum 2 has become clean alternatively according to experimental data a fixed number of times of circulation can also achieve a better effect after circulated treatment of water ends the water in the outer drum 2 is drained into the flocculation container once again at the same time the stop valve on off control structure is opened to make some water flood into the filter container to clean the strainer and finally the drain valve is opened to drain flocculated sewage sewage.