土壤质地和湿度对SVE技术修复苯污染土壤的影响  

Effects of Soil Texture and Water Content on Remediation of SVE on Soils Contaminated by Benzene

作　　者：刘少卿[1] 姜林[2] 姚珏君[2] 李艳霞[1] 刘希涛[1] 林春野[1] 

机构地区：[1]北京师范大学环境学院,水环境模拟与污染控制国家重点联合实验室,北京100875 [2]北京市环境保护科学研究院,北京100037

出　　处：《环境科学》2012年第5期1731-1735,共5页Environmental Science

基　　金：北京市科委重大项目(D08040000360000);中央高校基本科研业务费专项

摘　　要：土壤蒸汽抽提技术(soil vapor extraction,SVE)是一种安全、经济、高效的土壤治理技术,广泛应用于包气带土壤中挥发性有机污染物的去除.本研究选取有机污染物苯为对象,通过一维土柱通风模拟,分析了土壤质地(壤砂土、粉壤土和黏土)和湿度(0%、10%和20%)对SVE技术修复苯污染土壤的影响.结果表明,由于受到粉壤土有机质和黏土的通透性影响,这两组实验的SVE修复效率(68.3%和43.4%)小于壤砂土实验组(98.5%);此外,20%和10%湿度条件下的壤砂土土柱模拟实验会出现拖尾现象,而且湿度越大,SVE的修复效率越低.Soil vapor extraction（SVE） has been widely used for removal of volatile organic compounds（VOCs） from vadose zone as a safe,economical and efficient technology.Column-venting experiment was used to investigate removal of benzene in the soil by the SVE process.The effects of the soil texture（loamy sand,silt loam and clay） and water content on remediation efficiency were studied.The results showed that the removal efficiency of benzene from the loamy sand soil（98.5%） was higher than that for the silt loan and clay soils（68.3% and 43.4%）.In addition,the tail effects were observed in the loamy sand with 20% and 10% water content and the remediation efficiency was lower at higher water content.

关 键 词：土壤蒸汽抽提技术 苯 土柱通风模拟 土壤质地 湿度 

分 类 号：X53[环境科学与工程—环境工程]