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Numerical simulation of the radius of influence for landfill gas wells

Harold Vigneault, Rene Lefebvre and Miroslav Nastev
Numerical simulation of the radius of influence for landfill gas wells (in Research advances in vadose zone hydrology through simulations with the TOUGH codes, Stefan Finsterle (editor) and Curtis M. Oldenburg (editor))
Vadose Zone Journal (August 2004) 3 (3): 909-916

Abstract

In North America, most domestic waste produced is disposed in landfills. These sites generate leachate and gas, mainly CH (sub 4) and CO (sub 2) , which are harmful for the environment if not properly controlled. The design of active landfill gas recovery systems is based in large part on the radius of influence of vertical pumping wells. This parameter is commonly estimated empirically. This study presents results of numerical simulations of the radius of influence of gas recovery wells for different site conditions. The simulations were performed with the TOUGH2-LGM simulator. In the simulation scenarios, the radius of influence was defined in relation to several factors: the waste thickness, the generation rate of CH (sub 4) gas in the waste, and CH (sub 4) concentration in the recovered landfill gas. The results are presented in the form of general graphs that are not site-specific. The adequacy of the results still needs to be validated against field measurements. On the basis of simulation results, a systematic approach is proposed for the design of landfill gas recovery systems, and this approach is illustrated with a hypothetic example. This approach should guide landfill managers and engineers in the design of landfill gas recovery systems. The simulations only considered cases where landfills are open to the atmosphere, which are representative of most operating conditions. The results thus do not apply to post-closure conditions usually involving an impermeable cover built on top of the waste.


ISSN: 1539-1663
Serial Title: Vadose Zone Journal
Serial Volume: 3
Serial Issue: 3
Title: Numerical simulation of the radius of influence for landfill gas wells
Title: Research advances in vadose zone hydrology through simulations with the TOUGH codes
Author(s): Vigneault, HaroldLefebvre, ReneNastev, Miroslav
Author(s): Finsterle, Stefaneditor
Author(s): Oldenburg, Curtis M.editor
Affiliation: Institut National de la Recherche Scientifique-Eau, Terre et Environnement, Quebec City, QC, Canada
Affiliation: Lawrence Berkeley National Laboratory, Earth Sciences Division, Berkeley, CA, United States
Pages: 909-916
Published: 200408
Text Language: English
Publisher: Soil Science Society of America, Madison, WI, United States
Meeting name: TOUGH symposium
Meeting location: Berkeley, CA, USA, United States
Meeting date: 20030512May 12-14, 2003
References: 19
Accession Number: 2005-061940
Categories: Environmental geologyEconomic geology, geology of energy sources
Document Type: Serial Conference document
Bibliographic Level: Analytic
Annotation: Accessed on January 10, 2005
Illustration Description: illus. incl. 2 tables
Source Medium: WWW
N45°25'00" - N45°34'60", W73°45'00" - W73°30'00"
Secondary Affiliation: Geological Survey of Canada, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200521
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