Title: Analytical solutions for diffusion of organic contaminant through composite liner considering degradation in leachate and soil liner

Authors: Xun Wu; Jianyong Shi; Jun He

Addresses: Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Research Institute of Geotechnical Engineering, Hohai University, Xikang Road, Nanjing 210098, China ' Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Research Institute of Geotechnical Engineering, Hohai University, Xikang Road, Nanjing 210098, China ' College of Civil and Architectural Engineering, Hubei University of Technology, 1 Lijiadun Village, Wuhan 430068, China

Abstract: Analytical solutions for analysing organic contaminant diffusion through a composite liner are presented in this paper. The degradation of organic contaminants in leachate and soil liner are both taken into account. The validity and accuracy of the proposed analytical solutions are verified by comparing with a numerical method. The mass flux and concentration of organic contaminants are calculated by the proposed solutions for zeroconcentration and zero-mass flux boundary condition at the base of composite liner, respectively. The calculated mass flux and concentration at the base of the composite liner decrease with the decrease of contaminant half-life in leachate and soil liner. It can be concluded from parametric studies that increasing the thickness or sorption capacity of the soil liner is effective to improve the performance of composite liner. The solutions can be used for preliminary design of composite liners, and verification of complicated numerical methods.

Keywords: landfills; leachate; composite liner; organic contaminants; diffusion; degradation; analytical solution.

DOI: 10.1504/IJEP.2017.10006767

International Journal of Environment and Pollution, 2017 Vol.61 No.2, pp.166 - 185

Accepted: 22 Feb 2017
Published online: 01 Aug 2017 *

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