title: Effect of COD/N ratio on cultivation of aerobic granular sludge in a pilot-scale sequencing batch reactor.
abstract: Aerobic granular sludge was successfully cultivated with the effluent of internal circulation reactor in a pilot-scale sequencing batch reactor (SBR). Soy protein wastewater was used as an external carbon source for altering the influent chemical oxygen demand/nitrogen (COD/N) ratios of SBR. Initially, the phenomenon of partial nitrification was observed and depressed by increasing the influent COD/N ratios from 3.32 to 7.24 mg/mg. After 90 days of aerobic granulation, the mixed liquor suspended solids concentration of the reactor increased from 2.80 to 7.02 g/L, while the sludge volumetric index decreased from 105.51 to 42.99 mL/g. The diameters of mature aerobic granules vary in the range of 1.2 to 2.0 mm. The reactor showed excellent removal performances for COD and N₄⁺--N after aerobic granulation, and average removal efficiencies were over 93% and 98%, respectively. The result of this study could provide further information on the development of aerobic granule-based system for full-scale applications.
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, People's Republic of China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wei
authors.forename: Zhuangming
authors.initials: Z
authors.lastname: Qiao
authors.forename: Yongfang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Lianjie
authors.initials: L
authors.lastname: Hao
authors.forename: Wei
authors.initials: W
authors.lastname: Si
authors.forename: Bin
authors.initials: B
authors.lastname: Du
authors.forename: Qin
authors.initials: Q
authors.lastname: Wei
mesh_terms: D000332:Aerobiosis; D001419:Bacteria / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D007700:Kinetics; D009584:Nitrogen / Q000032:analysis* / Q000378:metabolism; D010100:Oxygen / Q000032:analysis* / Q000378:metabolism; D010316:Particle Size; D010865:Pilot Projects; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*
chemical_list: D012722:Sewage; D009584:Nitrogen; D010100:Oxygen