Electrochemical oxidation combined with physical-chemical pretreatment processes for the treatment of refractory landfill leachate
Electrochemical oxidation combined with physical-chemical pretreatment processes for the treatment of refractory landfill leachate
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DOI：
10.1089/109287501753359609
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发表时间：
2001-11-01
影响因子：
1.8
通讯作者：
Chung, CT
中科院分区：
文献类型：
--
作者：
Chiang, LC;Chang, JE;Chung, CT
采用电化学氧化法处理难降解垃圾渗滤液。结果表明，该工艺对COD和氨氮的去除是有效的，但单独电化学处理垃圾渗滤液需要昂贵的能量负荷。因此，混凝和吸附预处理进行辅助电化学氧化处理难降解垃圾渗滤液。在本研究中，电化学氧化与预处理工艺相结合的垃圾渗滤液的处理效果优于单独的电化学氧化工艺。电化学氧化与吸附预处理相结合，对COD和氨氮的去除率分别达到90.3%和80.1%。本研究采用混凝-活性炭吸附预处理工艺去除垃圾渗滤液中的特定有机物。混凝预处理后渗滤液中的有机物主要为低分子量有机物，而炭吸附预处理后的渗滤液中的有机物主要为高分子量有机物。混凝和吸附预处理引起的有机物特性的变化也影响垃圾渗滤液的电化学可处理性。电解炭吸附预处理后的渗滤液比电解混凝预处理后的渗滤液具有更高的电流效率和更快的COD去除率。因此，吸附预处理后的渗滤液中残留的有机物比混凝预处理后的渗滤液中残留的有机物更容易被电化学氧化处理。结果表明，电化学氧化过程有利于垃圾渗滤液中高分子量有机物的降解，而不利于低分子量有机物的降解。
An electrochemical oxidation process was adopted for the treatment of refractory landfill leachate in this study. It was found that the process was effective for the removal of COD and ammonium, but expensive energy loading was required for the individual electrochemical treatment of landfill leachate. Thus, coagulation and adsorption pretreatments were conducted to assist the electrochemical oxidation treatment of refractory landfill leachate. In this study, electrochemical oxidation combined with pretreatment processes was found to accomplish better results than the individual electrochemical oxidation process for the treatment of landfill leachate. COD and ammonium removal efficiencies of 90.3% and 80.1% could be obtained by electrochemical oxidation combined with adsorption pretreatment. In this study, coagulation and carbon adsorption pretreatment processes were found to remove specific organics in landfill leachate. Low molecular weight (LMW) organics were predominant after coagulation pretreatment while high molecular weight (HMW) compounds mostly found in the leachate after carbon adsorption pretreatment. The variation of organic characteristics caused by coagulation and adsorption pretreatments also affected the electrochemical treatability of landfill leachate. The electrolysis of the pretreated leachate by carbon adsorption showed higher current efficiency and faster COD removal rate than the electrolysis of coagulation pretreated leachate. It is inferred that the residual organics in the leachate pretreated by adsorption were more amenable to electrochemical oxidation treatment than those in the coagulation pretreated leachate. The results suggested that the electrochemical oxidation process favored the destruction of HMW organics rather than LMW organics in landfill leachate.