Ecological treatment technology for power-free river water purification

The invention belongs to the technical field of water treatment and particularly relates to an ecological treatment technology for power-free river water purification. According to the ecological treatment technology for power-free river water purification, an overflow dam is established to retain and store water, water is guided to an ecological stagnation pool and a landscape surface flow artificial wetland from a water intake gate, after primary filtering and sand settling, the water enters an artificial wetland system constructed on one side along the bank of a riverway, and finally the purified water flows into the riverway through a water outlet flap valve. The ecological treatment technology for power-free river water purification is combined with river water conservancy project construction, no additional power system is needed, and the river water flows through the artificial wetland system by means of the natural flow state of the river water. The hydraulic loading rate of the wetland system is 0.3-0.4 m /m .d, and the inflow water quality meets the IV-class standard or the V-class standard of surface water. The quality of the output water treated through the ecological treatment technology for power-free river water purification can reach the III-class standard of the surface water, and especially the removal effect on arsenic and heavy metal cadmium in river water is good. The ecological treatment technology for power-free river water purification has the advantages that the purifying effect is remarkable, the operation cost is low, maintenance and operation are easy and convenient, and the landscape greenlining effect is good.