Characterization of temporal variations in landfill gas components inside an open solid waste dump site in Sri Lanka |
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| Authors: | Masanao Nagamori MIM Mowjood Youichi Watanabe Yugo Isobe Tomonori Ishigaki Ken Kawamoto |
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| Institution: | 1. Center for Environmental Science in Saitama, Kazo, Saitama, Japan;2. Department of Agricultural Engineering, Faculty of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka;3. Center for Material Cycles and Waste Management, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan;4. Graduate School of Science and Engineering, Saitama University, Sakura-ku, Saitama, Saitama, Japan |
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| Abstract: | A long-term monitoring of composition of landfill gases in the region with high rainfall was conducted using an argon assay in order to discuss air intrusion into the dump site. Gas samples were taken from vertical gas monitoring pipes installed along transects at two sections (called new and old) of an abandoned waste dump site in Sri Lanka. N2O concentrations varied especially widely, by more than three orders of magnitude (0.046–140 ppmv). The nitrogen/argon ratio of landfill gas was normally higher than that of fresh air, implying that denitrification occurred in the dump site. Argon assays indicate that both N2 and N2O production occurred inside waste and more significantly in the old section. The Ar assay would help for evaluations of N2O emission in developing countries. Implications: A long-term monitoring of composition of landfill gases in the region with high rainfall was conducted using an argon assay in order to discuss air intrusion into the dump site. Argon assays indicate that both N2 and N2O production occurred inside waste and more significantly in the old section. |
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