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《Environmental Science & Technology》 2012-12
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Efficiency Effect of Current Density in Electrochemical Oxidation Treatment of Landfill Leachate

DAI Jin-guo1,2,SONG Qian-wu1,2,JIANG Ping2,WU Qi1,2,WANG Yan-jie2(1.College of Water Science,Beijing Normal University,Beijing 100089,China; 2.Chinese Research Academy of Environmental Science,Beijing 100012,China)  
Effect of current density for oxidation efficiency in landfill leachate treatment by electrochemical oxidation was studied.Electrochemical oxidation rate,current efficiency,energy consumption and generation of chloroform were mainly discussed.Results showed that current density had an important influence for landfill leachate treatment by electrochemical oxidation.After 6h for electrochemical oxidation with 30 mA/cm2,the oxidation rate of NH4+-N and COD was 7 mg/L·min and 4.4 mg/(L·min) respectively.Removal of NH4+-N was prior to COD removal,and current efficiency decreased with current density increase gradually,which reached 45.23% with current density at 30 mA/cm2,while current efficiency dropped to 34% with current density rose to 40 mA/cm2.Energy consumption analysis showed that energy consumption of NH4+-N firstly rise then drop with increase of current density,it dropped to 0.09 kWh/g NH4+-N with current density at 30 mA/cm2,the concentration of chloroform increased with electrolytic time,it reached 0.684 mg/L from below detection value in 6 h with current density at 40 mA/cm2,generation rate was 1.8 μg/(L·min),which increased with the increase of current density.
【Fund】: 国家水体污染控制与治理科技重大专项(2008ZX07211-006)
【CateGory Index】: X703
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