Diversity of operation performance and microbial community structures in MBRs and CAS processes at low temperature

In this paper, the performance of membrane bioreactors (MBR) and conventional activated sludge (CAS) processes at low temperature was investigated by analyzing their effluent quality and microbial viability. 454 high-throughput pyrosequencing was also applied to study the microbial community structu...

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Published inHuanjing kexue Vol. 35; no. 3; p. 1002
Main Authors Huang, Fei, Mei, Xiao-Jie, Wang, Zhi-Wei, Wu, Zhi-Chao
Format Journal Article
LanguageChinese
Published China 01.03.2014
Subjects
Bacteria - classification
Bioreactors - microbiology
Cold Temperature
Nitrogen - chemistry
Sewage - microbiology
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Summary:In this paper, the performance of membrane bioreactors (MBR) and conventional activated sludge (CAS) processes at low temperature was investigated by analyzing their effluent quality and microbial viability. 454 high-throughput pyrosequencing was also applied to study the microbial community structures. The results of three systems (two MBRs: R1 with high sludge concentration, R2 with low sludge concentration, and one CAS: R3) showed that the average removal rate of NH4(+) -N was 99.7%, 99.7% and 59.7%, respectively, and the average removal rate of TN was 85.2%, 56.1% and 58.8%, respectively. R2 showed the highest specific ammonium uptake rate (SAUR), followed by R1 and R3; R1 showed the highest specific nitrate uptake rate (SNUR), followed by R2 and R3. It could be concluded that MBRs with high sludge concentration had a better performance of nitrogen removal under low temperature operation. 454 high-throughput pyrosequencing analysis revealed that the microbial richness was R2 > R3 > R1, and the microbial d
ISSN:0250-3301
DOI:10.13227/j.hjkx.2014.03.026