Pollutant Migration in the GM+CCL Liner System Considering Leachate Mound
Changsha Environmental protection vocational College, Changsha, 410004, China
The municipal solid waste (MSW) landfills commonly utilize a low permeability liner system to control the escape of contaminants from the landfill. The clogging of the liner system because of leachate mound leads to increased hydraulic head of the leachate collection system, which results in higher pressure for the anti-pollution performance of the liner system. To study the anti-pollution performance of the geomembrane (GM) over a compact clay layer (CCL) liner system considering leachate mound, the minimum requirements for the design of the liner systems are introduced based on the specifations from three countries, including China, USA, and Germany. Then we adopt the one-dimensional finite layer model to analyze the anti-pollution performance of the GM+CCL liner systems. Parametric analyses are conducted to study the influence of the thickness of GM and the thickness of CCL etc, on the anti-pollution performance of the liner system. It is concluded that the GM+CCL liner system designed according to the minimum design requirements of Germany provide the best anti-pollution performance. The key factors affecting the critical time of the liner system are the hydraulic head, the number of defects on the GM, the thickness of the CCL and the hydraulic conductivity. In addition, some advices for the corresponding design provisions are proposed based on the parametric analyses.
Keywords: landfill, liner system, geomembrane, compact clay layer, clogging
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