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A laboratory study on migration of K+ in a two-layer landfill liner systemInstitute of Geotechnical Engineering, Southeast University, Nanjing 210098, P.R.Chinayanjundu{at}gmail.com
Institute of Lowland Technology, Saga University, Saga 840-8502, Japan
Contaminant transport through the clay liner and the underlying secondary leachate drain layer (SLDL) in landfills was studied through a laboratory test, and analysis method on the transport of K+ in a two-layer soil system. The soils used for this study were Ariake clay and the underlying layer, Shirasu soil from the Kyushu region of Japan, representing the clay liner material and SLDL material, respectively. The effective diffusion coefficients (D e) of the selected target chemical species, potassium (K+) for the Ariake clay and Shirasu soil were back-calculated using a computer program, and it was found that values of D e derived from this study were consistent with those previously published. The hypothesis that the mechanical dispersion process can be negligible has been proved to be reasonable based on both the observation that the predicted values fit the experimental data and the analyses of two dimensionless parameters. Parametric analysis showed the transport of K+ through the soils is controlled by advection–diffusion rather than diffusion only, whereas at low Darcy velocity (i.e.
Key Words: Contaminant • migration • advection • clay liner • diffusion • dispersion • Darcy velocity • landfill • wmr 833–9
Waste Management & Research, Vol. 23, No. 5,
439-447 (2005) |
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10–9 m s–1), transport of K+ would be controlled by diffusion. The test results and parametric analysis may be applied in design of landfill liners and SLDLs, particularly in coastal areas.