title: Aerobic granules cultivated and operated in continuous-flow bioreactor under particle-size selective pressure.
abstract: A novel method based on the selective pressure of particle size (particle-size cultivation method, PSCM) was developed for the cultivation and operation of aerobic granular sludge in a continuous-flow reactor, and compared with the conventional method based on the selective pressure of settling velocity (settling-velocity cultivation method, SVCM). Results indicated that aerobic granules could be cultivated in continuous operation mode by this developed method within 14days. Although in the granulation process, under particle-size selective pressure, mixed liquor suspended solids (MLSS) in the reactor fluctuated greatly and filamentous bacteria dominated the sludge system during the initial operation days, no obvious difference in profile was found between the aerobic granules cultivated by PSCM and SVCM. Moreover, aerobic granules cultivated by PSCM presented larger diameter, lower water content and higher specific rates of nitrification, denitrification and phosphorus removal, but lower settling velocity. Under long term operation of more than 30days, aerobic granules in the continuous-flow reactor could remain stable and obtain good chemical oxygen demand (COD), NH4(+)-N, total nitrogen (TN) and total phosphorus (TP) removal. The results indicate that PSCM was dependent on the cultivation and maintenance of the stability of aerobic granules in continuous-flow bioreactors.
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China. Electronic address: lewterme@126.com.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Liu
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Hang
authors.initials: H
authors.lastname: Xiao
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Huang
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Huijun
authors.initials: H
authors.lastname: Ma
authors.affiliation: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: He
authors.initials: H
authors.lastname: Liu
mesh_terms: D000332:Aerobiosis; D019149:Bioreactors; D010316:Particle Size; D011312:Pressure; D012722:Sewage
chemical_list: D012722:Sewage
keywords: Aerobic granular sludge; Batch reactor; Continuous flow; Long-term operation; Selective pressure