Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron

Juan Tang, Shuo Yao, Fei Xiao, Jianxin Xia and Xuan Xing
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Juan Tang: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Shuo Yao: China Energy Conservation and Environmental Protection Group, Beijing 100082, China
Fei Xiao: China Energy Conservation and Environmental Protection Group, Beijing 100082, China
Jianxin Xia: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Xuan Xing: Department of Environmental Science, College of Life and Environmental Science, Minzu University of China, Beijing 100081, China

IJERPH, 2022, vol. 19, issue 13, 1-11

Abstract: Electrochemical oxidation of landfill leachate after biological treatment by a novel electrochemical system, which was constructed by introducing a corroding electrode of iron (Fe c ) between a boron-doped diamond (BDD) anode and carbon felt (CF) cathode (named as BDD–Fe c –CF), was investigated in the present study. Response surface methodology (RSM) with Box–Behnken (BBD) statistical experiment design was applied to optimize the experimental conditions. Effects of variables including current density, electrolytic time and pH on chemical oxygen demand (COD) and ammonia nitrogen (NH 3 -N) removal efficiency were analyzed. Results showed that electrolytic time was more important than current density and pH for both COD and NH 3 -N degradation. Based on analysis of variance (ANOVA) under the optimum conditions (current density of 25 mA·cm −2 , electrolytic time of 9 h and pH of 11), the removal efficiencies for COD and NH 3 -N were 81.3% and 99.8%, respectively. In the BDD–Fe c –CF system, organic pollutants were oxidized by electrochemical and Fenton oxidation under acidic conditions. Under alkaline conditions, coagulation by Fe(OH) 3 and oxidation by Fe(VI) have great contribution on organic compounds degradation. What is more, species of organic compounds before and after electrochemical treatment were analyzed by GC–MS, with 56 kinds components detected before treatment and only 16 kinds left after treatment. These results demonstrated that electrochemical oxidation by the BDD–Fe c –CF system has great potential for the advanced treatment of landfill leachate.

Keywords: landfill leachate; electro-Fenton oxidation; response surface methodology; boron-doped diamond; corroding electrode of iron (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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