Zero-discharge treatment system for steel cold rolling wastewater

The utility model discloses a zero-discharge treatment system for steel cold rolling wastewater, which relates to the field of environmental protection equipment and comprises an ultrafiltration device which is sequentially connected with an ultrafiltration water outlet tank and a primary reverse osmosis device. The first-stage reverse osmosis device is sequentially connected with a first-stage concentrated water tank and a second-stage reverse osmosis device, the second-stage concentrated water tank, the first-stage reverse osmosis device and the second-stage reverse osmosis device are respectively provided with a scale inhibitor adding device and a bactericide adding device, and the second-stage concentrated water tank is sequentially connected with an efficient concentration device, an evaporation device and a reuse water tank. The zero-discharge treatment system for the steel cold-rolling wastewater is more scientific in design and more thought in consideration, the zero-discharge effect can be achieved f