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A national landfill methane budget for Sweden based on field measurements, and an evaluation of IPCC models

Authors:	By GUNNAR BÖRJESSON JERKER SAMUELSSON JEFFREY CHANTON ROLF ADOLFSSON BO GALLE BO H SVENSSON

Institution:	Department of Microbiology, Swedish University of Agricultural Sciences, P.O. Box 7025, SE-750 07 Uppsala, Sweden;;Department of Radio and Space Science, Chalmers Technical University, SE-412 96 Gothenburg, Sweden;;Department of Oceanography, Florida State University, Tallahassee, FL 32306-4320, USA;;Statistics Sweden, P.O. Box 24300, SE-104 51 Stockholm, Sweden;;Swedish National Labour Market Board, SE-113 99 Stockholm, Sweden;;Department of Water and Environmental Studies, Linköping University, SE-581 83 Linköping, Sweden

Abstract:	Seven Swedish landfills were investigated from 2001 to 2003. On each landfill, a measure of the total methane production was calculated from data on: (1) methane emissions (leakage); (2) methane oxidation and (3) from gas recovery. Methane emissions were determined via a tracer gas (N₂O) release-based remote sensing method. N₂O and CH₄ were measured with an Fourier Transform infrared detector at a distance of more than 1 km downwind from the landfills. Methane oxidation in the landfill covers was measured with the stable carbon isotope method. The efficiency in gas recovery systems proved to be highly variable, but on an average, 51% of the produced landfill gas was captured. A first-order decay model, based on four fractions (waste from households and parks, sludges and industrial waste), showed that the use of a degradable organic carbon fraction (DOCf) value of 0.54, in accordance with the default value for DOCf of 0.50 in the latest IPCC model, gave an emission estimate similar to the official national reports.

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