热强化气相抽提修复东北地区苯污染土壤研究  

REMOVAL OF BENZENE FROM CLAY SOIL IN NORTHEASTERN CHINA BY THERMAL ENHANCED SOIL VAPOR EXTRACTION

作　　者：李晓杰 张文文 马传博 马福俊[2] 谷庆宝[2] 许端平 LI Xiaojie;ZHANG Wenwen;MA Chuanbo;MA Fujun;GU Qingbao;XU Duanping(College of Resources and Environment Engineering,Liaoning Technical University,Fuxin 123000,China;Department of Contaminted Site Risk Control,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000 [2]中国环境科学研究院污染场地风险控制研究室,北京100012

出　　处：《环境工程》2022年第4期134-139,187,共7页Environmental Engineering

基　　金：国家重点研发计划资助项目“东北重工业区场地复合污染综合治理技术与集成工程示范”(2019YFC1803800)。

摘　　要：以东北地区黏土为研究对象,配置模拟污染土,通过实验室小试探究抽提速率、土壤含水率以及热强化作用对气相抽提修复苯污染土壤的影响,同时探究了不同含水率土壤在中心热源加热条件下的传热效果和土壤温度变化规律。结果表明:1)气相抽提修复苯污染东北黏土的最佳抽提速率为10 L/min;2)黏土土壤含水率为5%~20%时,气相抽提修复效果随着含水率升高而逐渐降低;但在热强化作用下,其修复效果随含水率增加呈先下降后升高趋势,且修复效果在含水率为5%时最佳;3)在中心热源加热条件下,黏土在含水率为5%时传热效果最好,土壤温度由热源中心沿径向呈非线性衰减,越靠近热源点附近衰减越明显;4)热强化气相抽提修复苯污染黏土时,中心热源温度为160℃时修复效果最佳。Taking the clay in Northeastern China as the research object,the contaminated soil was simulated,and the effects of extraction rate,soil water content and thermal enhancement on the remediation of benzene-contaminated soil by soil vapor extraction were studied.At the same time,the heat transfer effect of soil with different water content and the variation law of soil temperature under the heating condition of central heat source were explored.The results showed that:1)the best pumping rate for the remediation of benzene-contaminated soil by soil vapor extraction was 10 L/min;2)in the clay soil with water content of 5%~20%,the remediation effect of soil vapor extraction decreased with the increase of soil water content,but under the effect of thermal enhancement,the repair effect decreased and then increased with the increase of soil water content,and the repair effect was the best when the water content was 5%;3)under the condition of central heat source heating,the soil temperature showed nonlinear attenuation along the radial direction from the heat source,and the attenuation was more obvious near the heat source point;4)when thermal enhanced soil vapor extraction was used to repair benzene-contaminated clay,the restoration performance were best when the temperature of the central heat source was 160℃.

关 键 词：气相抽提 热强化 黏土 苯 

分 类 号：X53[环境科学与工程—环境工程]