Electrochemical Oxidation Combined with Physical–Chemical Pretreatment Processes for the Treatment of Refractory Landfill Leachate

An electrochemical oxidation process was adopted for the treatment of refractory landfill leachate in this study. It was found that the process was effective for the removal of COD and ammonium, but expensive energy loading was required for the individual electrochemical treatment of landfill leachate. Thus, coagulation and adsorption pretreatments were conducted to assist the electrochemical oxidation treatment of refractory landfill leachate. In this study, electrochemical oxidation combined with pretreatment processes was found to accomplish better results than the individual electrochemical oxidation process for the treatment of landfill leachate. COD and ammonium removal efficiencies of 90.3% and 80.1% could be obtained by electrochemical oxidation combined with adsorption pretreatment. In this study, coagulation and carbon adsorption pretreatment processes were found to remove specific organics in landfill leachate. Low molecular weight (LMW) organics were predominant after coagulation pretreatment ...