紫外光强化电化学连续流处理垃圾渗滤液  

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

作　　者：肖书虎[1,2] 宋永会[1] 万东锦[2,3] 赵旭[2] 肖宏康[1] 

机构地区：[1]中国环境科学研究院城市水环境研究室,北京100012 [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,北京100085 [3]河南工业大学化学化工学院,河南郑州450001

出　　处：《环境工程技术学报》2011年第2期95-100,共6页Journal of Environmental Engineering Technology

基　　金：中国博士后科学基金(20100470399);国家自然科学基金(20977103);国家水体污染控制与治理科技重大专项(2008ZX07208-003);中国环境科学研究院中央级公益性科研院所基本科研业务专项资助项目(2010KYYW15)

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(CODCr)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(200～500nm)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85min,施加电流密度为21.2mA/cm2条件下,垃圾渗滤液CODCr与NH3-N的去除率分别达到74.3%与94.9%,同时渗滤液的BOD5/CODCr达到0.6左右,提高了约12倍。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 CODCr 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 CODCr and 94.9% of NH3-N could be degraded in the UAE process at a retention time of 85 min and electric current density of21.2 mA/cm2.Simultaneously,the BOD5/CODCr of leachate could reach at about 0.6,and its biodegradability increased by about 12 times.

关 键 词：垃圾渗滤液 光电化学 连续流反应器 协同效应 可生化性 

分 类 号：X799.3[环境科学与工程—环境工程]