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Numerical Simulation of the Radius of Influence for Landfill Gas Wells

^a Institut National de la Recherche Scientifique, INRS-Eau, Terre et Environnement, 490 de la Couronne, Québec, G1K 9A9, Canada
^b Geological Survey of Canada, Natural Resources Canada, 490 de la Couronne, Québec, G1K 9A9, Canada

View larger version (17K): [in a new window]   Fig. 1. Gas generation rate in the Montreal landfill (Nastev, 1998).

View larger version (24K): [in a new window]   Fig. 2. Relative permeability of the gas phase.

View larger version (16K): [in a new window]   Fig. 3. Vertical two-dimensional radial conceptual model and grid elements for radial flow to a landfill gas recovery well.

View larger version (18K): [in a new window]   Fig. 4. Recovery rate as a function of the horizontal length of the model (equivalent to one-half of the spacing between wells) for three suctions at the production well. The radius of influence of a well is defined as the radial distance for which 90% of the CH4 produced in the waste is recovered by the well (shown by arrows).

View larger version (37K): [in a new window]   Fig. 5. Examples of CH4 concentration and gas flow direction for model lengths of 30 and 50 m (suction is 4.5 kPa and waste thickness is 20 m).

View larger version (32K): [in a new window]   Fig. 6. Radius of influence as a function of the landfill gas generation rate for five model thicknesses and three pumping suctions applied to the recovery well.

View larger version (33K): [in a new window]   Fig. 7. Volumetric fraction of CH4, CH4 mass flow rate, and total landfill gas flow rate in the well vs. the generation rate of landfill gas in the waste for three suctions applied to the recovery well and a 20-m waste thickness.

View larger version (33K): [in a new window]   Fig. 8. Volumetric fraction of CH4, CH4 mass flow rate, and total landfill gas flow rate in the well vs. the generation rate of landfill gas in the waste for three suctions applied to the recovery well and a 40-m waste thickness.

View larger version (21K): [in a new window]   Fig. 9. Radius of influence for a recovery well for three imposed suctions and for a waste column thickness of 20 m (based on results of Fig. 6).