The invention relates to a treatment method of
electroplating mixed water. The method comprises the following steps: (1) collecting the
electroplating mixed water in a water collecting tank, adjusting the pH value to be 2 to 3, hoisting the
electroplating mixed water from the water collecting tank into a micro-electrolytic reactor, carrying out the micro-
electrolysis by virtue of iron-
carbon filler, returning the electroplating mixed water to the water collecting tank from the micro-electrolytic reactor, circulating the electroplating mixed water until
hexavalent chromium ions in the electroplating mixed water are reduced to trivalent
chromium ions, and ending the circulation stage; (2) enabling the mixed water after the micro-
electrolysis to enter a coagulation reactor, stirring the mixed water, adjusting the pH value to 10 to 12, and sequentially adding a coagulant, a coagulant aid and a
sodium hypochlorite solution; (3) stopping stirring, standing and precipitating; (4) dehydrating the mud-water mixture in the coagulation reactor after the
water quality is qualified, discharging the water, adjusting the pH value of the discharged water to 6 to 9, and externally transporting mud cakes. The invention also discloses a device for realizing the method. By adopting the treatment method and the treatment device,
heavy metals and organic pollutants in the electroplating mixed water can be simultaneously and efficiently removed.