Photoelectrochemical treatment of landfill leachate in a continuous flow reactor

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• 作者：Xu Zhao ; Jiuhui Qu ; Huijuan Liu ; Chunxia Wang ; Shuhu Xiao ; Ruiping Liu ; Pengju Liu ; Huachun Lan ; Chengzhi Hu
• 关键词：Landfill leachate ; Photoelectrochemical treatment ; Flow reactor ; Electrolysis ; UV light irradiation
• 刊名：Bioresource Technology
• 出版年：2010
• 出版时间：February 2010
• 年：2010
• 卷：101
• 期：3
• 页码：865-869
• 全文大小：388 K

文摘

Leachate from a municipal landfill site, which has been treated by biological process, was treated by photoelectrochemical oxidation in a pilot scale flow reactor, using DSA anode and UV light irradiation. At a current density of 67.1 mA/cm² and 2.5 h reaction time, the removal rates achieved were for 74.1 % COD, 41.6 % for TOC, and 94.5 % for ammonium in the electrolysis process with UV light irradiation. In comparison, the removal rates of COD, TOC, and ammonium were decreased in the individual electrolysis process, respectively. The increase induced by the UV light irradiation was analyzed. The removal rates increased with the increase of current densities in the photoelectrochemical process. Combined with UV–vis spectra and gas chromatography–mass spectroscopy analysis, it is believed that the organic contaminants were efficiently mineralized into small molecular acids. At the meantime, the concentrations of metal ions in the landfill leachate were largely reduced.