期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 26, 期 5, 页码 1099-1107出版社
SCIENCE PRESS
DOI: 10.1016/S1001-0742(13)60589-6
关键词
micro-aerobic condition; elemental sulfur recovery; microbial community; functional gene array
资金
- National High-Tech Research and Development Program (863) of China [2011AA060904]
- National Natural Science Foundation of China [51111140388, 51176037, 51308147]
- National Creative Research Groups Project [51121062]
- State Key Laboratory of Urban Water Resource and Environment [2012DX06]
- Liaoning Provincial Science and Technology Project [L2010169]
Limited oxygen supply to anaerobic wastewater treatment systems had been demonstrated as an effective strategy to improve elemental sulfur (S-0) recovery, coupling sulfate reduction and sulfide oxidation. However, little is known about the impact of dissolved oxygen (DO) on the microbial functional structures in these systems. We used a high throughput tool (GeoChip) to evaluate the microbial community structures in a biological desulfurization reactor under micro-aerobic conditions (DO: 0.02-0.33 mg/L). The results indicated that the microbial community functional compositions and structures were dramatically altered with elevated DO levels. The abundances of dsrA/B genes involved in sulfate reduction processes significantly decreased (p < 0.05, LSD test) at relatively high DO concentration (DO: 0.33 mg/L). The abundances of sox and fccA/B genes involved in sulfur/sulfide oxidation processes significantly increased (p < 0.05, LSD test) in low DO concentration conditions (DO: 0.09 mg/L) and then gradually decreased with continuously elevated DO levels. Their abundances coincided with the change of sulfate removal efficiencies and elemental sulfur (S-0) conversion efficiencies in the bioreactor. In addition, the abundance of carbon degradation genes increased with the raising of DO levels, showing that the heterotrophic microorganisms (e.g., fermentative microorganisms) were thriving under micro-aerobic condition. This study provides new insights into the impacts of micro-aerobic conditions on the microbial functional structure of sulfate-reducing sulfur-producing bioreactors, and revealed the potential linkage between functional microbial communities and reactor performance.
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