Equivalent Transport Parameters for Volatile Organic Compounds in Coextruded Geomembrane–Containing Ethylene-Vinyl Alcohol
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 144, Issue 7
Abstract
A method to estimate the equivalent diffusion coefficient and partition coefficient of a coextruded ethylene-vinyl alcohol (EVOH) geomembrane (GM) is presented. The method is based on the weighted harmonic mean of diffusion coefficients of each layer and the partition coefficient of the outer layers. The method was evaluated using experimental data obtained with five volatile organic compounds (VOCs) typically found in landfill leachate [methylene chloride (MC), methyl tertiary butyl ether (MTBE), trichloroethylene (TCE), toluene (TOL), and chlorobenzene (CB)] and a coextruded GM composed of outer layers of low-density polyethylene (LLDPE) or high-density polyethylene (HDPE), an adhesive tie layer (maleic anhydride), and a core of EVOH. Equivalent diffusion coefficients computed with the recommended equation were found to be no different statistically from equivalent diffusion coefficients measured using a modified double-compartment apparatus. VOC transport through a composite liner using a coextruded EVOH GM was predicted using a finite-difference model with the equivalent transport parameters as input. Good agreement was obtained between predictions from the model and measured concentrations from a column test simulating a composite liner.
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Acknowledgments
Financial support for this study was provided by Kuraray Co., Ltd. and a research fellowship from the Geosynthetic Institute (GSI). The opinions, findings, and conclusions expressed herein are solely those of the authors and my not reflect those of Kuraray Co., Ltd. or the GSI.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 144 • Issue 7 • July 2018
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This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http://creativecommons.org/licenses/by/4.0/.
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Received: Sep 12, 2016
Accepted: Dec 11, 2017
Published online: May 10, 2018
Published in print: Jul 1, 2018
Discussion open until: Oct 10, 2018
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