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Numerical modeling of lateral landfill gas migration.

Nastev, Miroslav; Lefebvre, René; Therrien, René; Gélinas, Pierre (2003). Numerical modeling of lateral landfill gas migration. Journal of Solid Waste Technology and Management , vol. 29 , nº 4. p. 265-276.

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URL Officielle: http://solid-waste.org/

Résumé

The decomposition of the organic content of disposed waste results in production of heat and landfill gas, composed mainly of methane and carbon dioxide. The developed pressure, concentration and temperature gradients lead to gas emissions to the atmosphere and to lateral migration through surrounding soils. Environmental and safety issues associated with landfill gas require control of the off-site gas migration. The numerical model TOUGH2-LGM was used to simulate the landfill gas migration through unsaturated sands adjacent to the St-Etienne-des-Grès landfill site in Quebec, Canada, and to assist the design of the off-site gas control system in compliance with regulatory requirements. The model simulates the migration of four fluid components (water, nitrogen, methane and carbon dioxide) and one energy component (heat) in partially saturated media. Two examples are simulated: free lateral gas migration, and lateral gas migration towards a horizontal extraction well. Results show that a vacuum of 0.5 kPa in the horizontal well installed 10m from the landfill at 3 m depth is sufficient to limit further lateral migration of methane. The results also show the different flow patterns for methane and atmospheric air, and demonstrate the advantages of the multicomponent representation of the gas phase.

Type de document: Article
Mots-clés libres: landfill; landfill gas; methane; production; migration; numerical modeling
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 14:32
Dernière modification: 08 janv. 2021 14:32
URI: http://espace.inrs.ca/id/eprint/11062

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