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<p>The landfill leachate harbors a substantial volume of pollutants necessitating their eradication prior to environmental release. In this investigation, the electrochemical oxidation of Biologically Treated Landfill Leachate (BTLL), following treatment via Upflow Anaerobic Sludge Blanket (UASB). This investigation delved into and compared with the impact of various operational parameters within the electrochemical oxidation process for both Ti/SnO<sub>2</sub>-Sb<sub>2</sub>O<sub>3</sub> and Ti/PbO<sub>2</sub> anodes—namely, current density, duration of operation, sodium chloride concentration, and cathode—on the efficiency of pollutant removal. Additionally, it employed response surface methodology to discern the optimal operational conditions for electrochemical oxidation of landfill leachate. The final experimental results indicate that under a current density of 50 mA/cm<sup>2</sup> and an electrolysis time of 4 h, the COD removal rates for Ti/SnO<sub>2</sub>-Sb<sub>2</sub>O<sub>3</sub> anode and Ti/PbO<sub>2</sub> anode were 79.48% and 92.31%, respectively, while the TN removal rates were 57.99% and 57.17%, respectively. Additionally, NH<sub>4</sub><sup>+</sup>-N was completely removed for Ti/SnO<sub>2</sub>-Sb<sub>2</sub>O<sub>3</sub> anode and Ti/PbO<sub>2</sub> anode. Moreover, the former exhibited superior sewage treatment effectiveness when Ni was used as the cathode compared to Pt and steel. Response surface methodology (RSM) identified anode-specific optima: Ti/SnO<sub>2</sub>-Sb<sub>2</sub>O<sub>3</sub> (34 mA/cm<sup>2</sup>, 7.3 g/L NaCl) and Ti/PbO<sub>2</sub> (38 mA/cm<sup>2</sup>, 6.0 g/L NaCl), both at 4 h, yielding COD removals of 93.6% and 97.2% (experimentally validated), respectively. This study provides novel theoretical support for the combined treatment of landfill leachate using biotreatment and chemical oxidation processes.</p>

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Electrochemical treatment of bio-treated landfill leachate: Influence of electrode materials, current density, and sodium chloride concentration

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Lina Wu,
  • Yilan Yang,
  • Yuhui Wang,
  • Chenxu Wang,
  • Yulin Zhang,
  • Jiayuan Xu,
  • Zhi Jiao,
  • Yongzhen Peng

摘要

The landfill leachate harbors a substantial volume of pollutants necessitating their eradication prior to environmental release. In this investigation, the electrochemical oxidation of Biologically Treated Landfill Leachate (BTLL), following treatment via Upflow Anaerobic Sludge Blanket (UASB). This investigation delved into and compared with the impact of various operational parameters within the electrochemical oxidation process for both Ti/SnO2-Sb2O3 and Ti/PbO2 anodes—namely, current density, duration of operation, sodium chloride concentration, and cathode—on the efficiency of pollutant removal. Additionally, it employed response surface methodology to discern the optimal operational conditions for electrochemical oxidation of landfill leachate. The final experimental results indicate that under a current density of 50 mA/cm2 and an electrolysis time of 4 h, the COD removal rates for Ti/SnO2-Sb2O3 anode and Ti/PbO2 anode were 79.48% and 92.31%, respectively, while the TN removal rates were 57.99% and 57.17%, respectively. Additionally, NH4+-N was completely removed for Ti/SnO2-Sb2O3 anode and Ti/PbO2 anode. Moreover, the former exhibited superior sewage treatment effectiveness when Ni was used as the cathode compared to Pt and steel. Response surface methodology (RSM) identified anode-specific optima: Ti/SnO2-Sb2O3 (34 mA/cm2, 7.3 g/L NaCl) and Ti/PbO2 (38 mA/cm2, 6.0 g/L NaCl), both at 4 h, yielding COD removals of 93.6% and 97.2% (experimentally validated), respectively. This study provides novel theoretical support for the combined treatment of landfill leachate using biotreatment and chemical oxidation processes.