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中文摘要：
土工膜和粘土衬里组成的复合衬里已广泛用于填埋场的防渗.有机挥发性化合物在复合衬里中迁移时,其主要的机理是分子扩散作用。本文建立了有机挥发性化合物在复合衬里中的一维扩散模型,并得到了解析解.将该解析解和以往给出的数值解法作了比较,发现两者得到的结果较为接近,从而验证了本文解的可靠性.基于本文计算模型,分析了三种常用复合衬里对挥发性有机化合物的防渗性能.研究发现对于挥发性有机化合物甲苯,土工膜和GCL组成的复合衬里的浸出液总量要比土工膜和较厚粘土衬里组成的复合衬里大好几个量级.
英文摘要：
Composite liners （a geomembrane in intimate contact with a mineral liner） have been frequently used in landfills. Molecular diffusion is the predominant mechanism controlling volatile organic compounds transport within the composite liner. An analytical solution for one dimensional diffusion of VOCs through composite liners was presented. The results obtained by the solution presented here agreed well with the results obtained by the numerical methods previously published in the literature Based on this solution, three different composite liners were compared. As for toluene, it was shown that the cumulative mass discharged from the GCL composite liner was several orders of magnitude greater than that from composite liners having a thicker soil liner.
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