土壤污染的修复方法研究——以表面活性剂强化微米Fe/Cu对有机氯农药的降解为例  

The Remediation Method for Contaminated Soil: A Case Study of Degradation of Organochlorine Pesticides by Surfactant-Enhanced Fe/Cu Bimetallic System

作　　者：李川[1,2] 禹媛 万金忠[3] 王新新[1] 卞师怡 费菲[1] 薛建辉[1,2] 

机构地区：[1]南京林业大学生物与环境学院江苏省南方现代林业协同创新中心,江苏南京210037 [2]江苏省林业生态工程重点实验室南京林业大学,江苏南京210037 [3]环境保护部南京环境科学研究所,江苏南京210042

出　　处：《地球学报》2015年第4期493-499,共7页Acta Geoscientica Sinica

基　　金：国家自然科学基金青年基金(编号:41201311);江苏省高校自然研究重大项目(编号:12KJA180003);江苏省环保科研课题(编号:2013026);江苏高校优势学科建设工程资助项目(PAPD);南京林业大学2014年大学生实践创新训练计划项目联合资助

摘　　要：利用Cu作为催化金属与微米铁制成双金属体系处理主要污染物为六六六（HCH）和滴滴涕（DDT）的某污染场地土壤,探讨了不同表面活性剂（鼠李糖脂与Triton X-100（TX-100））对微米Fe/Cu双金属体系降解土壤中有机氯农药的影响。结果表明：相对于空白和只添加零价铁与微米Fe/Cu的三组的稳定,添加了两种表面活性剂的Fe/Cu双金属体系,35 d后土壤氧化还原电位（ORP）随时间呈缓慢上升趋势, Fe/Cu＋TX-100至55 d时ORP由–400 mV升高到–300 mV；除Fe/Cu＋鼠李糖脂组外,0~25 d内各组土壤pH随时间逐渐升高,从初始的5.0左右提高到6.5~7.2；微米Fe/Cu对污染物的降解效果相比零价铁有提高,鼠李糖脂与TX-100的投加能强化微米Fe/Cu对土壤中HCH和DDT的降解, TX-100的增强效果更为显著。当Fe投加量5%, Cu负载1%, TX-100浓度5 mmoL/L,初始pH 4.5时,处理55d后,α-HCH、γ-HCH、P, P’-DDD和P, P’-DDT的降解去除率达到100%、92.2%、95.7%和85.4%,总污染物去除率为90.0%。The polluted soil with main pollutants as hexachlorocyclohexane （HCH） and dichloro-diphenyl-trichloroethane （DDT） was dechlorinated using the bimetallic system made of micron iron powder and Cu. And the effects of micron Fe/Cu with surface active agents （rhamnolipid and Triton X-100 （TX-100）） on dechlorination efficiency of polluted soil containing organic-chlorine pesticide were analyzed. The results showed that Oxidation-Reduction Potential（ORP）of polluted soil increased slowly with time 35 d after the addition of micron Fe/Cu, with both surface active agents comparing with micron Fe/Cu only and control experiment. ORP was raised from –400 mV to –300 mV 55 d after the addition of micron Fe/Cu with TX-100; pH increased with time during the first 25 d from 5.0 to 6.5~7.2 except for the addition of micron Fe/Cu with rhamnolipid; the bimetallic system made of micron Fe/Cu had more efficient dechlorination effect relative to zero-valent iron, and both surface active agents, especially TX-100, improved the dechlorination efficiency of micron Fe/Cu in polluted soil. The pollutants removal rate was 90.0% and the removal rates ofα-HCH,γ-HCH, P, P’-DDD ＆amp; P, P’-DDT were 100%, 92.2%, 95.7% and 85.4%, respectively, 55 d after the addition of micron Fe （5%）, Cu （1%） and TX-100 （5 mmoL/L） with initial pH at 4.5.

关 键 词：Fe/Cu双金属 表面活性剂 六六六 滴滴涕 

分 类 号：X53[环境科学与工程—环境工程] X592