Performance-based design of landfill liners
Performance-based design of landfill liners
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DOI：
10.1016/s0013-7952(00)00096-x
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发表时间：
2001-06
影响因子：
7.4
通讯作者：
T. Katsumi;C. Benson;Gary J. Foose;M. Kamon
中科院分区：
文献类型：
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作者：
T. Katsumi;C. Benson;Gary J. Foose;M. Kamon
回顾了影响土工膜、粘土和复合材料衬垫中化学物质传输的因素，并提出了一种基于性能的简化评估垃圾填埋场底部衬垫的方法。对于单个土工膜衬垫，无机化学品的质量传递是根据假定的孔发生频率的孔泄漏率来计算的。有机化学品的传输是通过考虑分子通过完整土工膜的扩散来获得的。使用一维平流-分散-反应方程的解计算压实粘土衬垫中无机和有机化学品的迁移。对于由土工膜和粘土衬垫组成的复合衬垫，无机化学品的 3D 流动和传输使用等效的 1D 模型来近似，以通过有效传输区域进行传输。该近似值基于对各种案例进行的 3D 分析的结果。使用一维扩散模型计算有机化学品通过复合内衬的迁移。通过使用该方法评估几种不同衬里系统的相对性能来说明该方法的适用性。
Factors affecting chemical transport in geomembrane, clay and composite liners are reviewed, and a simplified performance-based method for evaluating landfill bottom liners is presented. For single geomembrane liners, mass transport of inorganic chemicals is calculated from the leakage rate from holes for an assumed frequency of hole occurrence. Transport of organic chemicals is obtained by accounting for molecular diffusion through the intact geomembrane. Migration of inorganic and organic chemicals in compacted clay liners is calculated using a solution of the 1D advection–dispersion-reaction equation. For composite liners consisting of a geomembrane and a clay liner, 3D flow and transport of inorganic chemicals is approximated using an equivalent 1D model for transport through an effective area of transport. The approximation is based on results from 3D analyses that have been conducted for a variety of cases. Migration of organic chemicals through composite liners is calculated using a 1D diffusion model. Applicability of the method is illustrated by using it to evaluate the relative performance of several different liner systems.