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Effects of a Gas Extraction Interruption on Emissions of Methane and Carbon Dioxide from a Landfill, and on Methane Oxidation in the Cover Soil

Department of Microbiology, Swedish University of Agricultural Sciences, Box 7025, S-750 07 Uppsala, Sweden.

Bo H. Svensson

Department of Water and Environmental Studies, Linköping University, S-583 81 Linköping, Sweden.

^* Corresponding author (Gunnar.Borjesson{at}mikrob.slu.se)

ABSTRACT

Landfills are regarded as important sources of atmospheric methane (CH₄), one of the major greenhouse gases. In this study, we investigated the effects of a gas extraction system on emissions of CH₄ and carbon dioxide (CO₂) to the atmosphere, from a small (0.37-ha) Swedish landfill site. The experiment was conducted using a static chamber technique and 11 permanent frames installed in a transect. Measurements were made for 7 d with a gas extraction system in operation, followed by 7 d without gas extraction, and a third week when the system was operating again. Methane emissions ranged between –0.056 and 182 mmol CH₄ m^–2 h^–1 when the extraction system was in operation, and between –0.060 and 872 mmol CH₄ m^–2 h^–1 during the interruption period. The interruption resulted in enhanced CH₄ concentrations in the cover-soil profile, especially in the surface soil (0–0.25 m depth), and CH₄ oxidation activity was significantly increased in most parts of the soil cover during the interruption, thus indicating that the growth of CH₄-oxidizing bacteria increased in response to enhanced CH₄ concentrations.

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