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

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...

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Autores principales: Tang, Juan, Yao, Shuo, Xiao, Fei, Xia, Jianxin, Xing, Xuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9265374/
https://www.ncbi.nlm.nih.gov/pubmed/35805405
http://dx.doi.org/10.3390/ijerph19137745
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author Tang, Juan
Yao, Shuo
Xiao, Fei
Xia, Jianxin
Xing, Xuan
author_facet Tang, Juan
Yao, Shuo
Xiao, Fei
Xia, Jianxin
Xing, Xuan
author_sort Tang, Juan
collection PubMed
description 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.
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spelling pubmed-92653742022-07-09 Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron Tang, Juan Yao, Shuo Xiao, Fei Xia, Jianxin Xing, Xuan Int J Environ Res Public Health Article 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. MDPI 2022-06-24 /pmc/articles/PMC9265374/ /pubmed/35805405 http://dx.doi.org/10.3390/ijerph19137745 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Tang, Juan
Yao, Shuo
Xiao, Fei
Xia, Jianxin
Xing, Xuan
Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron
title Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron
title_full Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron
title_fullStr Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron
title_full_unstemmed Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron
title_short Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron
title_sort electrochemical oxidation of landfill leachate after biological treatment by electro-fenton system with corroding electrode of iron
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9265374/
https://www.ncbi.nlm.nih.gov/pubmed/35805405
http://dx.doi.org/10.3390/ijerph19137745
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