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Waste Management & Research, Vol. 21, No. 1, 62-73 (2003)

Atmospheric methane transport near landfill sites

Efthimios Tagaris

Dept. of Environmental Studies, University of the Aegean, Xenia Building, University Hill, 81100 Mytilene, Greece

Rafaella-Eleni P. Sotiropoulou

Dept. of Environmental Studies, University of the Aegean, Xenia Building, University Hill, 81100 Mytilene, Greece

Christodoulos Pilinis

Dept. of Environmental Studies, University of the Aegean, Xenia Building, University Hill, 81100 Mytilene, Greece

Constani=tinos P. Halvadakis

Dept. of Environmental Studies, University of the Aegean, Xenia Building, University Hill, 81100 Mytilene, Greece

Methane production rates that have been estimated by a biogas production model (MICROGEN) are combined with an air dispersion model in order to determine the spatial distribution of methane around landfill sites. By utilising dispersion models under extreme atmospheric conditions, a maximum methane concentration around the landfills can be determined. The factors that enhance the maximum methane concentrations, using the meteorological model CALMET in conjunction with the dispersion model CALPUFF, are found to be the wind speed and the percentage of cloud cover. The rates of temperature and pressure variation, as well as the land use category seem to have no effect on the maximum methane concentrations. A rapid reduction of methane concentration is observed a few metres away from the landfill centre while a slower reduction is observed at distances greater than 300 m from it. The performance of this methodology is evaluated by comparing measured concentrations with model predictions.

Key Words: Solid waste • municipal refuse • landfill • methane • dispersion • wmr 583-7.


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