Microbial characteristics and community analysis of bioaugmented MBR system
生物强化对MBR系统生物特性及群落结构的影响

The membrane bioreactor (MBR) bioaugmented by a strain with high degradability for bromamine acid was used for treating bromamine acid wastewater. The biodegradation ability and the physiological state changes were studied before and after the high efficiency strain was added. And the ribosomal intergenic sequence analysis (RISA) was used to show the changes of microbial community during the period. The results show that after inoculation, the decolorization rates of the supernatant and the membrane effluent remained 50% and 65% approximately, and the removal rates of COD were about 25% and 50%, respectively. Although these results were similar to that of the system without high efficiency strain, however the influent load was increased, thus the absolute removal amount was increased. The TTC-dehydrogenase activity and the extracellular polymeric substances (EPS) fluctuated slightly after inoculation, and then were back to the earlier level after a period of operation. Microbial community analysis shows that the inoculated high efficiency strain could steadily survive in the system and did not affect the indigenous populations of the microbial communities.