Method for treating coking waste water by electro-Fenton-coagulation combination process

The invention relates to a method for treating coking waste water by an electro-Fenton-coagulation combination process, which comprises the following steps of: 1) introducing biochemical effluent of the coking waste water into a regulation pond, regulating water quality and water volume, and regulating the pH value to be between 2 and 4; 2) introducing the effluent in the regulation pond into an electrochemical reactor, adding H2O2, and regulating current density to be between 50 and 300 A/m<2>; 3) introducing the effluent in the electrochemical reactor into a coagulation sedimentation pond, regulating the pH value to be between 7 and 8 by using alkaline liquor, adding a flocculating agent, performing a flocculating reaction, and performing mud water separation in the sedimentation pond; and 4) filtering the effluent in the sedimentation pond by a sand leach unit, and discharging. By the method, the biochemical effluent of the coking waste can be deeply treated, chemical oxygen demand(COD), ammonia nitrogen and chromaticity of the effluent can meet the requirements of national first-level discharge standards and the water inflow requirement of the advanced treatment of membrane separation.