BTEX污染含水层不同形态铁含量变化的试验模拟  

Lab-Scale Simulation of Content Changes of Iron Species in a BTEX-Contaminated Aquifer

作　　者：王霄[1] 赵勇胜[1] 张皓[1] 苏燕[1] 曾增[1] 陶怡[1] 周睿[1] 

机构地区：[1]吉林大学,地下水资源与环境教育部重点实验室,吉林长春130021

出　　处：《环境科学研究》2012年第7期798-802,共5页Research of Environmental Sciences

基　　金：吉林省科技发展计划项目(201101020);国家环境保护公益性行业科研专项(201009009);吉林大学基本科研业务费项目(200903152)

摘　　要：通过砂柱试验模拟BTEX(苯、甲苯、乙苯和二甲苯的混合物)污染含水层的过程,分析了含水层中铁形态分布及氧化还原环境的变化.结果表明:发生铁还原反应区域介质中的w(TFe)降幅最大,达25.7%;而发生硫酸盐还原反应的区域介质中的w(TFe)因亚铁沉淀生成作用降幅减至11.7%～14.6%.铁还原菌电子受体主要来源于氧化物结合态铁;氧化物结合态铁首先转化为可交换态铁,进而被利用.硫化物结合态铁的形成可作为硫酸盐还原过程开始的标志.A lab-scale column was constructed to investigate the pollution process of an aquifer by BTEX （ mixture of benzene, toluene, ethyl-benzene and xylenes）. Variations of iron species and redox environments were analyzed,in order to clarify the biogeochemical process of iron reduction. The experimental results indicated that the total iron content decreased in the iron reduction zone, with the maximum decreasing extent reaching 25.7%. The total iron content decreased less in the sulfate reduction zone due to the precipitation of ferrous iron,with the decreasing extent being 11.7%- 14. 6%. Oxides combined iron,which was transformed to exchangeable iron first and then utilized by microbes,were the dominant electron acceptor sources for iron reduction bacteria. The formation of ferrous sulfide could serve as an indicator of the beginning of sulfate reduction.

关 键 词：BTEX 含水层 氧化还原带 不同形态铁 

分 类 号：X523[环境科学与工程—环境工程]