CH4 emission and CH4 emission reduction potential of intermediate cover layer in semi-aerobic landfills
YUE Bo1, YAN Zhuo-yi2, HUANG Qi-fei1, WU Xiao-hui1, GAO Hong2
1. Research Institute of Solid Waste Management, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 2. Faculty of Civil Engineering and Architectural, Kunming University of Science and Technology, Kunming 650500, China
Abstract：The CH4 emission fluxes of a MSW semi-aerobic landfill located in Hebei Province were determined; meanwhile the CH4 oxidation capacities of the intermediate cover material. Based on the above research, the CH4 emission reduction potential of intermediate cover layer were analyses in semi-aerobic landfill. The surface CH4 emission flux of intermediate cover layer is relatively large at noon and afternoon, and the average CH4 emission fluxes for the landfill age of 4, 8, 12, and 16months were 4.79, 21.16, 81.04 and 7.44g/(m2·d), respectively. Moreover, the CH4 oxidation capacities of intermediate cover material were:aged-refuse in anaerobic landfill > aged-refuse in semi-aerobic landfill > aged-cover soil > the mixture of aged-refuse and new cover soil (1:10, weight/weight) > animal manure compost > MSW composting > new cover soil. Theoretically, for the MSW landfill bodies with the age of 4, 8 and 16months, the CH4 gas emissions can be completely oxidized by covering layer of the aged-refuse in anaerobic landfill, aged-refuse in semi-aerobic landfill, aged cover soil and stale garbage, or the mixture of aged-refuse and new cover soil (1:10, weight/weight). In addition, for the MSW landfill bodies with the age of 12months, the CH4 gas emissions in area around 5~15m of air pipe can be theoretically oxidized by the cover layer of the aged-refuse or aged cover soil, but in area around 0~5m of air pipe cannot be completely eliminated by the cover materials.
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