Abstract
AbstractCompacted clay liners have been widely used as bottom liners in municipal solid waste landfills around the world. However, landfill leachate contains a large variety of pollutants with widely different migration characteristics, and the interaction between multiple pollutants have an effect on migration of pollutants. In this study, a numerical parametric study is conducted to investigate the transport behaviors of commonly found leachate pollutants through compacted clay liner. Prior to the numerical parametric study, the numerical model was verified by centrifuge test results. Parameters considered include dispersivity of compacted clay liner, diffusion coefficients and retardation factors of typical pollutants. The simulation results showed that the pollutant transported through compacted clay liner faster when multiple pollutants were simultaneously present in the leachate. Under a high leachate water head, the effect of diffusion coefficient was not obvious on the pollutants transport through compacted clay liner, moreover, the influence of dispersivity and retardation factor was more significant.KeywordsNumerical parametric studyMultiple pollutantsBreakthroughCCLMSW landfill
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