中文摘要：

某重要岩溶地下水源地因附近农药厂排放含四氯化碳污水而受到严重污染,实验采用土柱通风试验模拟土壤气相抽提（SVE）,研究环境温度为20℃,通风速率为40 mL/min,土壤含水率10%,而土壤有机质含量分别为3.02%和0.13%条件下的两种供试土壤中四氯化碳污染物的去除过程。结果表明,土柱通风能有效去除土壤中的四氯化碳污染物;通风条件下四氯化碳的去除过程符合一级反应动力学,土壤中四氯化碳浓度C（μg/L）的对数值lnC与时间t呈良好的线性关系,相关系数均在0.95以上;土壤有机质含量为3.02%的土柱Ⅰ各取样口四氯化碳去除反应速率常数k值在0.013 2~0.015 5 h-1之间,有机质含量为0.13%的土柱Ⅱ各取样口k值在0.017 1~0.020 6 h-1之间,说明土壤气相抽提去除四氯化碳的效率与土壤有机质含量有关,相同条件下低有机质含量的土壤其四氯化碳去除效率更高。

英文摘要：

A main Karst groundwater supply source was polluted by carbon tetrachloride.Column-venting experiment was done to simulate soil vapor extraction in order to inquiry the removal of carbon tetrachloride from soil.Experiment was done at 20 ℃ with venting velocity of 40 mL/min,the two kinds of experimental soils moisture content were both 10%,but organic matter content were 3.02% and 0.13% respectively.Results showed that carbon tetrachloride can be effectively removed by ventilation.Removal of carbon tetrachloride in soil follows the first order reaction kinetics.There is a good linear relationship between lnC and temperature,with correlation coefficients above 0.95.When soil organic matter content is 3.02%,reaction rate constants of the removal of carbon tetrachloride are 0.013 2 h-1~0.015 5 h-1 in Column I.When soil organic matter content is 0.13%,the reaction rate constants are 0.017 1 h-1~0.020 6 h-1 in Column II,which showed that the removal efficiency of soil vapor extraction is related to soil organic matter content,soil with lower organic matter content has higher removal efficiency.