Effects of a Gas Extraction Interruption on Emissions of Methane and Carbon Dioxide from a Landfill, and on Methane Oxidation in the Cover Soil
- Gunnar Börjesson * and
- Bo H. Svensson
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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