Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4998044 | Bioresource Technology | 2016 | 8 Pages |
â¢Pure oxygen fine bubbles-MBR was developed treating coal gasification wastewater.â¢Organic matter reduction and membrane fouling mitigation were improved in O2-MBR.â¢Less amount of EPS and larger particle size distribution existed in novel system.â¢Pure oxygen with fine bubbles promoted marked evolution of bacterial community.
A lab-scale study was investigated to evaluate the effect of pure oxygen fine bubbles on membrane bioreactor (O2-MBR) performance of treating coal gasification wastewater. Compared with conventional MBR using aeration source of air (CMBR), the removal efficiencies of COD and total phenols increased by 28% and 36%, and the organic compositions of treated effluent represented significant difference that was mainly attributed to the controlled the foam expansion and enhanced the enzymatic activities in O2-MBR. Moreover, membrane fouling mitigation was observed in O2-MBR, probably owing to the less EPS amount and larger PSD. It was notable that the pure oxygen with fine bubbles promoted marked evolution of bacterial community from CMBR to O2-MBR, particularly, the bacterial community richness and diversity in O2-MBR was lower than CMBR, and the genera Phycisphaera, Comamonas, Thauera and Ohtaekwangia composed the top four most relative abundance genera in O2-MBR, giving the total relative abundance of 26.7%.