期刊
BIORESOURCE TECHNOLOGY
卷 106, 期 -, 页码 36-43出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.11.112
关键词
Antibiotics; Membrane bioreactor; Solids retention time; Removal performance; Microbial community
资金
- National High Technology Research and Development Program of China [2009AA062902]
- National Water Pollution Control Program [2009ZX07317-008-5]
- Shu Guang Project [10GG12]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRY11015]
The effect of solids retention time on reactor performance and microbial community composition in anoxic/aerobic membrane bioreactors (A/O-MBR) were investigated in this study. Experimental results showed high removal efficiencies of conventional pollutants. Antibiotics removal efficiencies were obviously affected by SRT changes. Longer SRT (above 30 days) was proved to be suitable operational condition for antibiotics removal. Denaturing gradient gel electrophoresis (DGGE) and clone library analysis revealed that bacteria belong to Betaproteobacteria and Gammaproteobacteria were the dominant species during wastewater treatment and antibiotics removal. SRT significantly influenced the relative numbers of nitrifying bacteria. Removal efficiency of total nitrogen (TN) decreased when SRT was 3 days, because nitrogen loading exceeded the denitrification ability of the reactors. Unlike tet C and tet E genes, sulfa antibiotics resistance gene presented a decreasing tendency with the decrease of SRT, and finally affected sulfa antibiotics removal efficiencies. (C) 2011 Elsevier Ltd. All rights reserved.
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