Method for treating and recycling circulating wastewater

The invention provides a method for treating and recycling industrial circulating wastewater, which comprises the following steps of: adding a polyacrylamide flocculant into the circulating wastewater to perform flocculation reaction, wherein 4 to 8mg of flocculant is added into every 1L of sewage and the flocculation reaction time is controlled to be at least 5 minutes; allowing the sewage afterthe flocculation reaction to enter a high-efficiency floatation tank, controlling the air floatation time to be at least 10 minutes, allowing the air floatation water to discharge into a filter tank,and discharging the water after filtering; adding an acid into the filtered discharged water to regulate the alkalinity of the water body, adding a scale inhibitor and delivering the water to a cartridge filter; and delivering the filtered effluent from the cartridge filter to an electrodialysis reversal system to perform desalination, wherein the effluent treated by the electrodialysis reversal system is used as make-up water for circulating water. The method can more effectively realize continuous treatment of the sewage and water production without using nanofiltration and reverse osmosis technology; the treated sewage keeps a certain amount of ions; and the effluent meets the requirements of the water quality of reused water of a circulating water system.