Abstract
Methane transport was evaluated using column tests for simulated interim cover profiles composed of soil only or soil over a geomembrane (GM). Tests were conducted with a co-extruded GM of ethylene-vinyl alcohol (EVOH), a linear low-density polyethylene (LLDPE) GM, a polyvinyl chloride (PVC) GM, or a polyethylene (PE) geofilm used in conjunction with one of three soils (clay, silt, or sand). Methane breakthrough from the simulated covers with LLDPE and PVC GMs (6–8 days) was approximately three times more rapid relative to the cover with the EVOH GM (22 days). Breakthrough from the simulated cover with a geofilm (2 days) was ten times more rapid relative to the cover with the EVOH GM. Methane diffusion coefficients for the co-extruded EVOH GM obtained by inversion of the column data were 190–290 times lower than diffusion coefficients for the conventional GMs and the 0.1-mm PE geofilm. Soil type had minimal influence on methane transport through the interim covers relative to GM type. Predictions made with a numerical model parameterized using diffusion coefficients obtained from the column tests indicate that methane fluxes from interim landfill covers with an EVOH GM are approximately two orders of magnitude lower than methane fluxes from an interim cover with a conventional GM and six orders magnitude of lower than with soil alone.
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Acknowledgments
Financial support for this study was provided by Kuraray Co., Ltd. Support for Benson was provided by the U.S. Department of Energy through the Consortium for Risk Evaluation with Stakeholder Participator (CRESP). The opinions, findings, and conclusions expressed herein are solely those of the authors and may not reflect those of Kuraray Co., Ltd.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 144 • Issue 2 • February 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jan 3, 2017
Accepted: Jun 26, 2017
Published online: Dec 14, 2017
Published in print: Feb 1, 2018
Discussion open until: May 14, 2018
ASCE Technical Topics:
- Chemicals
- Chemistry
- Clays
- Diffusion
- Diffusion (porous media)
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Geomaterials
- Geomechanics
- Geomembranes
- Geosynthetics
- Geotechnical engineering
- Landfills
- Materials engineering
- Methane
- Organic compounds
- Plastics
- Polyethylene
- Polymer
- Soil mechanics
- Soils (by type)
- Synthetic materials
- Thermodynamics
- Transport phenomena
- Waste management
- Waste sites
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