Landfill is an important atmospheric mercury emission source |
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Authors: | Email author" target="_blank">Xinbin?FengEmail author Shunlin?Tang Zhonggen?Li Shaofeng?Wang Lian?Liang |
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Institution: | (1) State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) Graduate School of Chinese Academy of Sciences, 100039 Beijing, China;(3) Cebam Analytical, INC, 3927 Aurora Ave, 98103 Seattle, WA, USA |
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Abstract: | Since municipal wastes contain refuses with high mercury contents, incineration of municipal wastes becomes the major anthropogenic
atmospheric mercury emission source. In China, landfills are however the main way to dispose of municipal wastes. Total gaseous
mercury (TGM) concentrations in landfill gas of Gaoyan sanitary landfill located in suburb of Guiyang City were monitored
using a high temporal resolved automated mercury analyzer, and mono-methylmercury (MMHg) and dimethylmercury (DMHg) concentrations
in landfill gas were also measured using GC coupled with the cold vapor atomic fluorescence (CVAFS) method. Meanwhile, the
TGM exchange fluxes between exposed waste and air and the soil surface of the landfill and air, were measured using low Hg
blank quartz flux chamber coupled with high temporal resolved automated mercury analyzer technique. TGM concentrations in
landfill gas from half year filling area averaged out at 665.52 ±291.25 ng/m3, which is comparable with TGM concentrations from flue gas of a small coal combustion boiler in Guiyang. The average MMHg
and DMHg concentrations averaged out at 2.06 ±1.82 ng/m3 and 9.50±5.18 ng/m3, respectively. It is proven that mercury emission is the predominant process at the surfaces of both exposed wastes and soil
of landfill. Landfills are not only TGM emission source, but also methylmercury emission source to the ambient air. There
are two ways to emit mercury to the air from landfills, one is with the landfill gas through landfill gas duct, and the other
through soil/air exchange. The Hg emission processes from landfills are controlled by meteorological parameters. |
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Keywords: | mercury landfills MMHg DMHg soil-air exchange mercury flux |
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