期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 154, 期 -, 页码 159-165出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2015.02.024
关键词
Aged refuse; Air exposure; Hydrogen sulfide; Speciation; Conversion
资金
- National Natural Science Foundation of China [41471408, 41101453, 41101466, 51108419]
- Natural Science Foundation of Zhejiang Province [LY14D010001]
- project for youth researcher of Zhejiang Gongshang University [QY11-22]
- Innovative Research Team in Higher Educational Institutions, Zhejiang Province [T200912]
Hydrogen sulfide (H2S(g)) emission from landfills is a widespread problem, especially when aged refuse is excavated. H2S(g) emission from aged refuse exposed to air was investigated and the results showed that large amounts of H2S(g) can be released, especially in the first few hours after excavation, when H2S(g) concentrations in air near refuse could reach 2.00 mg m(-3). Initial exposure to air did not inhibit the emission of H2S(g), as is generally assumed, but actually promoted it. The amounts of H2S(g) emitted in the first 2 d after excavation can be very dangerous, and the risks associated with the emission of H2S(g) could decrease significantly with time. Unlike a large number of sulfide existed under anaerobic conditions, the sulfide in aged municipal solid waste can be oxidized chemically to elemental sulfur (but not sulfate) under aerobic conditions, and its conversion rate was higher than 80%. Only microorganisms can oxidize the reduced sulfur species to sulfate, and the conversion rate could reach about 50%. Using appropriate techniques to enhance these chemical and biological transformations could allow the potential health risks caused by H2S(g) after refuse excavation to be largely avoided. (C) 2015 Elsevier Ltd. All rights reserved.
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