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
Rok vydání: 2019
Předmět:
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