Sulfate reduction at micro-aerobic solid–liquid interface in landfill
Autor: | Dongsheng Shen, Lifang Hu, Weijia Liu, Yuyang Long, Luyao Ying, Lihua Yao, Chengran Fang |
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Rok vydání: | 2019 |
Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Soil Pollutants Environmental Chemistry Anaerobiosis Leachate Sulfate Waste Management and Disposal Solid liquid 0105 earth and related environmental sciences biology Sulfates Chemistry equipment and supplies biology.organism_classification Pollution Refuse Disposal Waste Disposal Facilities Environmental chemistry Cycling Oxidation-Reduction Anaerobic exercise Bacteria Environmental Monitoring |
Zdroj: | Science of The Total Environment. 667:545-551 |
ISSN: | 0048-9697 |
DOI: | 10.1016/j.scitotenv.2019.02.275 |
Popis: | H2S can be produced under aerobic conditions, which goes against the traditional view of an obligatory anaerobic metabolism process. In this research, the sulfate-reduction behavior at the micro-aerobic solid–liquid interface in a landfill was investigated. H2S emission from mineralized waste from the landfill material could be enhanced when exposed to O2. The highest H2S concentration of 56.54 mg·m−3, observed at an O2 concentration of 2%, was 4.5 times higher than the highest concentration of H2S recorded under anaerobic conditions. The presence of leachate influenced protection of the anaerobic sulfate-reducing bacteria against O2, allowing the bacteria to survive and even undergo significant sulfate reduction under micro-aerobic conditions. The sulfate concentration could be maintained at a high level because of possible oxidation–reduction cycling under micro-aerobic conditions and the risk of H2S emission was always high. This research provides a theoretical basis for controlling the release of H2S within landfills. |
Databáze: | OpenAIRE |
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