title: Effect of rainfall on the diurnal variations of CH₄, CO₂, and N₂O fluxes from a municipal solid waste landfill.
abstract: This paper presents the results of a field investigation into the effect of rainfall on the diurnal variations of CH(4), CO(2), and N(2)O fluxes at three different sites in a landfill. The three sites were all net sources of CH(4), CO(2), and N(2)O emissions ranging from 4.7-796 mg CH(4)-Cm(-2)h(-1), 131-811 mg CO(2)-Cm(-2)h(-1), and 90.6-2,209 μg N(2)O-Nm(-2)h(-1). CH(4) and N(2)O were generated by anaerobic digestion of waste and by nitrification and denitrification in the cover soil, respectively. Installation of an HDPE (High Density Polyethylene) membrane cover at landfill Site 1 was very effective in controlling CH(4) emissions, and the CH(4) fluxes at that site were 40-50 times lower than those at Site 2 and Site 3. For 36 h following a rainfall event, both CH(4) and N(2)O emissions were significantly correlated with moisture content of the cover soil at the two landfill sites without HDPE membrane cover (p<0.05). When CH(4) and N(2)O fluxes were expressed as CO(2)-equivalent (CO(2)-e) emissions, CH(4) emissions dominated in the three gases after rainfall (96.1% CO(2)-e emissions) and could be expressed by the following equation: Y(CH4)=988.7+41.1X((soil moisture content))-32.2X((soil temperature)) (R(2)=0.73, p<0.05).
authors.affiliation: Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of P.R. China, Nanjing, Jiangsu 210042, PR China.
authors.forename: Houhu
authors.initials: H
authors.lastname: Zhang
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Yan
authors.forename: Zucong
authors.initials: Z
authors.lastname: Cai
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D002245:Carbon Dioxide / Q000032:analysis* / Q000737:chemistry; D002681:China; D004784:Environmental Monitoring; D008697:Methane / Q000032:analysis* / Q000737:chemistry; D009609:Nitrous Oxide / Q000032:analysis* / Q000737:chemistry; D011891:Rain; D012037:Refuse Disposal; D062611:Solid Waste / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D062611:Solid Waste; D002245:Carbon Dioxide; D009609:Nitrous Oxide; D008697:Methane