[Effect of dissolved oxygen on microbial community in simultaneous removal of carbon, nitrogen and sulfur process].
In order to investigate the effect of dissolved oxygen (DO) on microbial community in simultaneous removal of carbon, nitrogen and sulfur process and reveal the mechanism of high elemental sulfur conversion rate under aerobic condition, GeoChip was employed to characterize the structure of microbial community. The results indicated that the microbial community structure significantly changed with different aerobic conditions (P < 0.001). Diversity indices of microbial community increased at relatively high DO level. However, denitrifiers were greatly inhibited at this level due to the high sensitivity to DO. There was no significant change detected in the abundance of sulfate-reducing bacteria (SRB) with the changing DO. The relative abundance of sox gene showed significant difference between aeration rate of 20 mL x min(-1) and aeration rate of 0 mL x min(-1), which might suggest that the activity of sulfur-oxidizing bacteria (SOB) was obviously improved by DO. Moreover, cluster analysis of sox gene confirmed this suggestion, with higher signal intensity found in numbers of probes derived from SOB under such aerobic conditions. Overall, the results revealed a positive effect of micro-aerobic conditions on the simultaneous removal of carbon, nitrogen and sulfur process.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. micro_yh@126.com
Hao
H
Yu
Chuan
C
Chen
Li
L
Zhang
Ai-Jie
AJ
Wang
D001419:Bacteria / Q000145:classification* / Q000378:metabolism; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000302:isolation & purification* / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism; D010100:Oxygen / Q000032:analysis / Q000737:chemistry*; D012995:Solubility; D013455:Sulfur / Q000302:isolation & purification / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
D002244:Carbon; D009584:Nitrogen; D010100:Oxygen; D013455:Sulfur; D062065:Wastewater