渗滤液污染羽中污染物和氧化还原灵敏性物质的分布  

Distribution of Pollutants and Redox Sensitive Substrates in Landfill Leachate Pollution Plume

作　　者：董军[1] 赵勇胜[1] 张伟红[1] 

机构地区：[1]吉林大学环境与资源学院,长春130026

出　　处：《环境科学》2008年第9期2613-2617,共5页Environmental Science

基　　金：国家重点基础研究发展规划(973)项目(2004CB418505);吉林大学'985工程'项目

摘　　要：通过砂箱模拟实验研究了垃圾渗滤液污染羽中的氧化还原分带以及污染物和氧化还原灵敏性物质在其中的分布和变化特点.结果表明,污染物和氧化还原灵敏性物质的分布和变化受氧化还原环境的影响,产甲烷带/硫酸盐还原带、铁还原带、硝酸盐还原带和氧还原带等4个氧化还原带中Eh分别为-148.2、-95.4、30.6和223.2 mV,pH分别为7.13、6.49、6.38和6.21,电导率分别为211.4、55.2、29.4和17.8 mS/m.产甲烷带/硫酸盐还原带有利于乙苯、二甲苯、苯、甲苯和三氯乙烯等多数有机物的降解,其沉积物对大多数重金属具有较好的富集作用,除As和Cd外,Cr、Ni、Pb和Zn的含量最高分别为28.21、11.58、9.05和23.5 mg/kg.CO2、硫化物、HCO3-、NH4+、TOC、Fe2+、NO2-和SO42-等物质的浓度随离污染源距离增加而降低.A box filled with sandy soil was constructed to investigate the redox zones of landfill leachate pollution plume and the distribution and varying characteristics of contaminants and redox sensitive substrates. Results indicated that the distribution and variation of pollutants and redox sensitive substrates were influenced by redox environment; Eh of water in methanogenic/sulfate reduction zone, iron reduction zone, nitrate reduction zone and oxygen reduction zone is - 148.2, - 95.4, 30.6 and 223.2 mV; conductivity is 211.4, 55.2, 29.4 and 17.8 mS/m, and pH is 7.13, 6.49, 6.38 and 6.21, respectively. Methanogenic/sulfate reduction zone play significant roles for attenuation of the most organic pollutants such as ethylbenzene, dimethylbenzene, benzene, and TCE etc. Most heavy metals could deposit in methanogenic/ sulfate reduction zone sediments, except As and Cd, and the highest content of Cr, Ni, Pb and Zn is 28.21, 11.58, 9.05 and 23.5 mg/kg, respectively. Concentration of CO2 , sulfide, HCO3^- , NH4^＋ , TOC, Fe^2＋ , NO2^- and SO4^2- are decrease with the distance away from the pollution source.

关 键 词：污染羽 氧化还原灵敏性物质 氧化还原带 垃圾渗滤液 

分 类 号：X143[环境科学与工程—环境科学]