紫外光强化电化学连续流处理垃圾渗滤液

肖书虎; 宋永会; 万东锦; 赵旭; 肖宏康

doi:10.3969/j.issn.1674-991X.2011.02.016

紫外光强化电化学连续流处理垃圾渗滤液

doi: 10.3969/j.issn.1674-991X.2011.02.016

肖书虎^1,2*,,
宋永会¹,
万东锦^2,3,
赵旭²,
肖宏康¹

1.
中国环境科学研究院城市水环境研究室
2.
中国科学院生态环境研究中心,环境水质学国家重点试验室
3.
河南工业大学化学化工学院

详细信息

通讯作者:
肖书虎

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出版历程
- 收稿日期: 2010-09-26
- 修回日期: 2010-10-28
- 刊出日期: 2011-03-20

UV-assisted Electrochemical Treatment of Landfill Leachate in a Continuous Flow Reactor

1.
Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences
2.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Sciences
3.
College of Chemistry and Chemical Engineering, Henan University of Technology

More Information

Corresponding author: XIAO Shu-hu

摘要

摘要: 设计构建了一套放大的连续流一体化反应器，采用紫外光强化电化学法对某垃圾填埋场生化处理后的垃圾渗滤液进行处理，分别考察了水力停留时间、电流密度等因素对渗滤液化学需氧量(COD_Cr)及氨氮(NH₃-N)去除效果的影响，并对电化学与紫外光强化电化学过程进行了对比。通过渗滤液UV–vis光谱(200～500 nm)以及GC/MS分析，发现光电强化电化学过程中能生成大量的有机羧酸等小分子有机物，进而明显改善渗滤液生化性。结果表明：紫外光强化电化学过程可以有效处理垃圾渗滤液，在不调节pH且不添加电解质，水力停留时间为85 min，施加电流密度为21.2 mA/cm²条件下，垃圾渗滤液COD_Cr与NH₃-N的去除率分别达到74.3%与94.9%，同时渗滤液的BOD₅/COD_Cr达到0.6左右，提高了约12倍。
- 垃圾渗滤液 /
- 光电化学 /
- 连续流反应器 /
- 协同效应 /
- 可生化性
Abstract: A magnified continuous-flow integrated reactor was developed and UV-assisted electrochemical (UAE) oxidation was adopted to treat leachate from a municipal sanitary landfill after biological process. The effects of hydraulic retention time and applied electric current density on the removal of COD_Cr and NH₃-N were investigated, and UAE process and single electrochemical process compared to observe the synergetic effect. Based on analysis of UV-vis spectra (200~500 nm) and GC/MS, it was found that many small organic molecules such as organic carboxylic acids were generated in the process, which could be responsible for the improvement of biodegradability. The results showed that UAE process could treat landfill leachate effectively. Without pH adjustment and electrolyte addition, 74.3% of COD_Cr and 94.9% of NH₃-N could be degraded in the UAE process at a retention time of 85 min and electric current density of 21.2 mA/cm². Simultaneously, the BOD₅/COD_Cr of leachate could reach at about 0.6, and its biodegradability increased by about 12 times.
- landfill leachate /
- photoelectrochemical /
- continuous reactor /
- synergetic effect /
- biodegradability