SEASONAL AND DIURNAL METHANE EMISSIONS FROM A LANDFILL AND THEIR REGULATION BY METHANE OXIDATION |
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| Institution: | 1. Department of Microbiology, Swedish University of Agricultural Sciences, Box 7025, Uppsala, S-750 07, Sweden;2. Department of Water and Environmental Studies, Linköping University, Linköping, S-581 83, Sweden;1. Dept of Civil and Environmental Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, FL 32311, USA;2. Ecole Nationale d’Ingénieurs de Gabès, University of Gabès, Rue Omar Ibn-Elkhattab 6029, Gabès, Tunisia;3. LASMAP, Ecole Polytechnique de Tunisie, University of Carthage, B.P. 743, La Marsa 2078, Tunisia;4. Geosyntec Consultants, Columbia, MD 21046, USA;5. Waste Management, Inc., Minneapolis, MN 55337, USA;1. Ecole Nationale d’Ingénieurs de Gabès, University of Gabès, Rue Omar Ibn-Elkhattab, 6029 Gabès, Tunisia;2. LASMAP, Ecole Polytechnique de Tunisie, University of Carthage, B.P. 743, La Marsa 2078, Tunisia;3. Department of Civil and Environmental Engineering, Florida State University, Tallahassee, FL 32310, USA;4. Waste Management, Inc., 2956 Montana Avenue, Cincinnati, OH 45211, USA;1. Department of Environmental Engineering, Technical University of Denmark, Miljøvej – Building 113, DK-2800 Lyngby, Denmark;2. Chalmers University of Technology/FluxSense AB, SE-41296 Göteborg, Sweden;1. Faculty of Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;2. Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA;3. Yolo County Planning & Public Works Department, Division of Integrated Waste Management, Woodland, CA 95776, USA;4. Air Quality Research Center, University of California, Davis, CA 95616, USA;5. Now at Terra Pacific Group, Irvine, CA 92618, USA;6. Department of Oceanography, Florida State University, Tallahassee, FL 32306, USA;7. Department of Biological and Agricultural Engineering, University of California, Davis, CA 95616, USA |
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| Abstract: | Rates of methane emission from a Swedish landfill, measured by chamber technique and permanent frames, ranged between 0.034 and 20 mmol CH4m?2. h?1on average. The emissions followed a seasonal pattern, with the highest fluxes occurring between September and May. Methane concentrations in soil also followed a seasonal pattern, with a marked decrease during summers. Using the means of methane emission rates from frost-free periods, a stepwise regression model was made, that could explain 95% of the variation. Soil temperature turned out to be the dominating factor, explaining 85% when transformed to a second-degree function. Methane emissions were negatively correlated with soil temperature, which strongly suggests that biological methane oxidation is an important regulating factor. The activity of methane-oxidizing microorganisms was greatest around 0.5–0.6 m depth in the soil profile, and moisture at this level enhanced emissions. The tendency for methane emissions to be higher at night was probably due to the inhibitory influence of low soil temperatures on methane-oxidizing microorganisms. |
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