Quantifying methane oxidation in a landfill-cover soil by gas push–pull tests |
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| Authors: | KE Gómez G Gonzalez-Gil A Lazzaro MH Schroth |
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| Institution: | 1. Department of Environmental Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;2. Ramboll Denmark A/S, DK-5100 Odense C, Denmark;3. Klintholm I/S, DK-5874 Hasselager, Denmark;4. FluxSense AB/Chalmers University of Technology, SE-412 96 Göteborg, Sweden;1. Geoenvironmental Group, Department of Civil Engineering, University of Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada;2. Dept. of Biology, University of Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada;1. Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. Department of Urban and Environmental Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;3. Department of Civil and Environmental Engineering, Faculty of Engineering, Hasanuddin University, Jl. Poros Malino Km.6 Gowa, 92172 South Sulawesi, Indonesia;1. Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kongens Lyngby, Denmark;2. FORCE Technology, Park Allé 345, 2605 Brøndby, Denmark;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. Center for Environmental Engineering Research and Education (CEERE) and Department of Civil Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada;2. CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur 440 020, India |
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| Abstract: | Methane (CH4) oxidation by aerobic methanotrophs in landfill-cover soils decreases emissions of landfill-produced CH4 to the atmosphere. To quantify in situ rates of CH4 oxidation we performed five gas push–pull tests (GPPTs) at each of two locations in the cover soil of the Lindenstock landfill (Liestal, Switzerland) over a 4 week period. GPPTs consist of the injection of a gas mixture containing CH4, O2 and noble gas tracers followed by extraction from the same location. Quantification of first-order rate constants was based upon comparison of breakthrough curves of CH4 with either Ar or CH4 itself from a subsequent inactive GPPT containing acetylene as an inhibitor of CH4 oxidation. The maximum calculated first-order rate constant was 24.8 ± 0.8 h?1 at location 1 and 18.9 ± 0.6 h?1 at location 2. In general, location 2 had higher background CH4 concentrations in vertical profile samples than location 1. High background CH4 concentrations in the cover soil during some experiments adversely affected GPPT breakthrough curves and data interpretation. Real-time PCR verified the presence of a large population of methanotrophs at the two GPPT locations and comparison of stable carbon isotope fractionation of CH4 in an active GPPT and a subsequent inactive GPPT confirmed that microbial activity was responsible for the CH4 oxidation. The GPPT was shown to be a useful tool to reproducibly estimate in situ rates of CH4 oxidation in a landfill-cover soil when background CH4 concentrations were low. |
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