Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 23, Issue 3, Pages 2557-2565Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-015-5496-1
Keywords
Microbial community; COD/TP ratio; Simultaneous nitrification and denitrification; Molecular biological technique
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Funding
- National Natural Science Foundation of China [21177075, 50908133]
- Program for New Century Excellent Talents in University [NCET-10-0554]
- Natural Science Foundation for Distinguished Young Scholars of Shandong province [JQ201216]
- Natural Science Foundation of Jiangsu Normal University [13XLR023]
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To evaluate the impact of chemical oxygen demand (COD)/total phosphorus (TP) ratio on microbial community characteristics during low-oxygen simultaneous nitrification and denitrification process, three anaerobic-aeration (low-oxygen) sequencing batch reactors, namely R1, R2, and R3, were performed under three different COD/TP ratios of 91.6, 40.8, and 27.6. The community structures of each reactor were analyzed via molecular biological technique. The results showed that the composition of ammonia-oxidizing bacteria (AOB) was affected, indicated by Shannon indexes of the samples from R1, R2, and R3. Nitrosomonas was identified to be the dominant AOB in all SBRs. Moreover, the copy numbers of nitrifiers were more than those of denitrifiers, and the phosphorus-accumulating organisms to glycogen-accumulating organisms ratio increased with the decrease of COD/TP ratio.
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