A new simplified method to calculate breakthrough time of municipal solid waste landfill liners
A new simplified method to calculate breakthrough time of municipal solid waste landfill liners
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DOI：
10.1016/j.jclepro.2019.02.050
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发表时间：
2019-05
影响因子：
11.1
通讯作者：
S. Shu;Wei Zhu;Jiangwei Shi
中科院分区：
文献类型：
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作者：
S. Shu;Wei Zhu;Jiangwei Shi
压实粘土衬垫和土工膜被广泛用作城市固体废物填埋场的底部衬垫，以最大限度地减少由于垃圾渗滤液的迁移而导致的地下水污染。然而，渗滤液的渗漏仍然可以将渗滤液中的污染物通过底部衬垫输送，造成环境污染。因此，填埋场的设计需要估计底部衬垫的穿透时间。目前计算该穿透时间的方法非常复杂，因此本研究探讨了一种简化计算方法。针对关键指标污染物的一维垂向运移，提出了两个简化的计算公式，分别用于计算单个压实粘土和复合衬砌的穿透时间。所提出的方法考虑污染物输送机制的平流，扩散，机械分散和吸附。该方法简单易行，可为此类垃圾填埋场的设计、管理和后续恢复提供参考。
Compacted clay liners and geomembranes are extensively used as bottom liners in municipal solid waste landfills, to minimize groundwater contamination due to the migration of landfill leachate. Seepage of leachate, however, can still transport pollutants in leachate through the bottom liner and cause environmental contamination. Design of a landfill site, therefore, requires estimation of the breakthrough time of the bottom liner. Current methods to calculate this breakthrough time are extremely complicated, so this study investigated a simplified calculation. For one–dimensional vertical transport of a key indicator pollutant, two simplified formulas are proposed to calculate breakthrough times of single compacted clay and composite liners. The proposed method considers pollutant transport mechanisms of advection, diffusion, mechanical dispersion, and adsorption. It is easy to use and can provide a reference for design, management, and subsequent restoration of such landfill sites.