有机污染物在完好复合衬垫中的迁移分析

Analysis of organic contaminant transfer through intact composite liner

在复合衬垫中,有机污染物除了在土工膜缺陷处发生迁移外,在完好土工膜中的迁移也是主要方式。考虑有机污染物在土工膜边界处的浓度跳跃现象,建立了有机污染物在完好复合衬垫中迁移的一维模型,得到了解析解。通过与有限差分解的比较,验证了解答的合理性。应用该解答分析了GCL复合衬垫和CCL复合衬垫防止有机污染物渗漏的效果。结果表明,CCL复合衬垫的效果较好,可以通过黏土改性和增加黏土厚度的方法来提高其有效性。有机污染物类型的选择对GCL复合衬垫的分析结果影响较大,而阻滞系数的变化对分析结果影响较小。

Besides through the defect of geomembrane, the transfer of organic contaminant through intact composite liner is an important way. A one-dimensional model for analyzing organic contaminant transfer through intact composite liner is established, and then an analytical solution of organic contaminant transfer through intact composite liner is obtained. The comparison between analytical and numerical solutions shows that the analytical solution is reasonable. The effects of GCL and CCL composite liners preventing leakage on organic contaminant are analyzed. CCL composite liner is more effective, and the effectiveness can be improved through modifying soil and its thickness. The choice of organic contaminant influences the result of GCL composite liner greatly, and the change of retard coefficient can be ignored.