Air Permeability of Waste in a Municipal Solid Waste Landfill
Publication: Journal of Environmental Engineering
Volume 131, Issue 11
Abstract
The permeability of compacted municipal solid waste in a landfill with respect to air (or gas) flow was estimated using a short-term air injection test. Air was added to 134 vertical wells installed at three different depths at flow rates in the range of and the corresponding steady state pressures were recorded. The permeability of the waste with respect to airflow (described here as the air permeability) was estimated for different anisotropy ratios ( , 10, and 100) using a steady state, two-dimensional, axisymmetric analytical fluid flow model in conjunction with the measured flow and pressure data. The air permeability of landfilled municipal solid waste modeled as an isotropic medium was found to range from to . The estimated air permeability results were on the low end of values previously applied to model landfill gas flow. Estimated air permeability decreased significantly with increasing waste depth. The lower permeability encountered in the deeper layers was primarily attributed to the lower porosity of the waste caused by higher overburden pressures and higher moisture content of waste in deeper layers of the landfill than in shallow layers. The results suggest that multiple wells screened at different depths provide greater control of air distribution within the landfill. Leachate recirculation was documented to impact the ability to add air. In addition to limitations posed by standing water in many of the deeper wells, waste exposed to leachate recirculation was found to be significantly less permeable to air when compared to original conditions.
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Acknowledgments
The Florida Bioreactor Demonstration Project was funded by the Florida Department of Environmental Protection and the Florida Center for Solid and Hazardous Waste Management. The writers wish to acknowledge the support of the project sponsors, the New River Solid Waste Association, and the site engineers Jones, Edmunds and Associates. Sreeram Jonnalagadda, William Matthew Farfour, and Nitin Gawande provided valuable assistance in the collection of data presented in this paper.
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Published In
Journal of Environmental Engineering
Volume 131 • Issue 11 • November 2005
Pages: 1565 - 1573
Copyright
© 2005 ASCE.
History
Received: Jul 15, 2004
Accepted: Apr 1, 2005
Published online: Nov 1, 2005
Published in print: Nov 2005
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