title: Effects of short solids retention time on microbial community in a membrane bioreactor.
abstract: Effects of operating lab-scale nitrifying membrane bioreactors (MBR) at short solids retention times (SRT=3, 5 and 10d) were presented with focus on reactor performance and microbial community composition. The process was capable of achieving over 87% removal of ammonia and 95% removal of chemical oxygen demand (COD), almost regardless of SRT. The denaturing gradient gel electrophoresis (DGGE) analysis shown that bacterial communities evolved in time in a similar way at different SRT. The results of clone library analysis indicated that Betaproteobacteria was the dominant bacterial group in all the reactors but there were significant difference of species for different SRT with higher species diversity at longer SRT. Ammonia and COD removal efficiencies were not correlated with the number of bacterial species or their diversity.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
authors.forename: Liang
authors.initials: L
authors.lastname: Duan
authors.forename: Ivan
authors.initials: I
authors.lastname: Moreno-Andrade
authors.forename: Chun-Lin
authors.initials: CL
authors.lastname: Huang
authors.forename: Siqing
authors.initials: S
authors.lastname: Xia
authors.forename: Slawomir W
authors.initials: SW
authors.lastname: Hermanowicz