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首页> 外文会议>The Solid Waste Association of North America~(~R) 7th Annual Landfill Symposium Jun 17-19, 2002 Louisville, Kentucky >IMPACT OF CATION EXCHANGE ON THE PERFORMANCE OF GEOSYNTHETIC CLAY LINERS
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IMPACT OF CATION EXCHANGE ON THE PERFORMANCE OF GEOSYNTHETIC CLAY LINERS

机译：阳离子交换对土工合成黏土衬砌性能的影响

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摘要

Considerable attention has recently been focused on the potential incompatibility between various liquids found in landfill leachate and geosynthetic clay liners (GCLs). Many investigators have reported that the hydraulic conductivity of GCLs used in covers and liners can increase by several orders of magnitude when permeated with liquids containing polyvalent cations. One limitation of these results is that the impacts of the increase in hydraulic conductivity of the GCL on the overall performance of the waste containment system are presently unknown. In this investigation, the effects of adverse chemical interactions between cover percolation and landfill leachate with GCLs on the performance of a municipal solid waste landfill are evaluated. Based on results from this study, it appears that the overall performance of composite landfill covers and liners may not be degraded as much as may be inferred from hydraulic conductivity tests on GCLs. For instance, for composite liners having a GCL, assuming typical design constraints, an increase in hydraulic conductivity of the geosynthetic clay liner from 1x10~(-11) m/s to 3x10~(-10) m/s, results in an increase in the leakage rate by a factor of approximately 1.6. Furthermore, it is demonstrated that the performance of individual components of cover and liner systems should be considered with respect to the overall performance of the integrated system to reach rational conclusions regarding the performance of individual components of the system.
机译：最近，相当多的注意力集中在垃圾渗滤液中发现的各种液体与土工合成粘土衬里（GCL）之间的潜在不相容性。许多研究人员报告说，当渗透到含有多价阳离子的液体中时，用于盖和衬里的GCL的水力传导率可以增加几个数量级。这些结果的局限性在于，目前尚不清楚GCL的水力传导率增加对废物围堵系统整体性能的影响。在这项调查中，评估了覆盖渗滤和垃圾渗滤液与GCL之间不利的化学相互作用对城市固体垃圾填埋场性能的影响。根据这项研究的结果，看来复合垃圾掩埋场覆盖物和衬里的整体性能可能不会像从GCL的水力传导性测试中得出的那样下降。例如，对于具有GCL的复合衬里，假设典型的设计约束，土工合成粘土衬里的水力传导率从1x10〜（-11）m / s增加到3x10〜（-10）m / s，导致增加泄漏率大约是1.6倍。此外，证明了覆盖和衬里系统的各个组件的性能应相对于集成系统的整体性能加以考虑，以得出有关系统各个组件的性能的合理结论。

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