水份对土壤二维蒸气抽排去污效果影响研究

土壤蒸气抽排（SVE）是一种经济、高效、安全并已被广泛应用的污染场址现场修复技术．它能经济高效地去除非饱和带土壤中的挥发性有机污染物（VOCs）。在此以油污染土壤为例。进行了土壤二维抽排模拟实验．研究了土壤质量分数m（H2O）：m（土壤）对VOCs去污效果的影响，实验结果表明：在降低m（H2O）：m（土壤）的情况下，抽排气中挥发性较强的有机物质正戊烷（C5H12）质量浓度下降的很快，较早地进入SVE的拖尾阶段，最终保持在较低的质量浓度水平。挥发性一般的正辛烷（C8H18）和挥发性较弱的正癸烷（C10H22）经过长时间的抽排后，污染物的质量浓度也得到了降低，进入拖尾的时间相对较长，最终保持在一定的质量浓度水平。这表明降低m（H2O）：m（土壤）可以提高污染物去除速率，从而缩短净化时间，提高了去污效果。同时对一维抽排模拟实验和二维抽排模拟实验结果进行了比较．说明了两者之间的异同之处．

Research on Decontamination Influence of Moisture on Two Dimensional Soil Vapor Extraction

Soil vapor extraction （SVE） is a highly acceptable in-situ remediation technology, which holds the characters of economy, high efficiency and security. It can wipe off the volatile organic compounds （VOCs）. The article analyzed the two dimensional soil vapor extraction experiment, the influence of the soil moisture on the effect of decontamination was discussed. By decreasing the soil moisture, the result showed that the concentration of N-Pentane （C5H12）decreased quickly, and finally remained the low content in the increasing of vapor flux. The content of the common volatile N-Octane（C3H18） and the less volatile N-Decane （C10H22） also decreased after a long time of extraction, and finally it kept in a high content. When the decontamination velocity of VOCs was highly increased, the time was decreased and the decontamination effect was increased. The result of two dimensional test and one dimension test were compared.