title: Aerobic granulation and nitrogen removal with the effluent of internal circulation reactor in start-up of a pilot-scale sequencing batch reactor.
abstract: Aerobic granular sludge was successfully cultivated with the effluent of internal circulation (IC) reactor in a pilot-scale sequencing batch reactor (SBR) using activated sludge as seeding sludge. N removal was investigated in the start-up of aerobic granulation process. Initially, the phenomenon of partial nitrification was observed and nitrite accumulation rates (NO(2) (-)-N/NO (x) (-) -N) were between 84.6 and 99.1 %. It was potentially caused by ammonium oxidizing bacteria (AOB) in the seeding activated sludge, high external environmental temperature (~32 °C) and free ammonia (FA) concentration. After 50 days' running, the aerobic granules-based bioreactor demonstrated perfect performance in simultaneous removal of organic matter and ammonia nitrogen, and average removal efficiencies were maintained above 93 and 96 %, respectively. The maximum nitrogen removal efficiency of 83.1 % was achieved after the formation of aerobic granules. The average diameter of mature aerobic granular sludge mostly ranged from 0.5 to 1.0 mm. Furthermore, one typical cyclic test indicated that pH and DO profiles could be used as effective parameters for biological reactions occurring in the aerobic/anoxic process. The obtained results could provide further information on the cultivation of aerobic granular sludge with practical wastewater, especially with regard to nitrogen-rich industrial wastewater.
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan, Shandong, 250022, People's Republic of China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wei
authors.forename: Wei
authors.initials: W
authors.lastname: Si
authors.forename: Yongfang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhuangming
authors.initials: Z
authors.lastname: Qiao
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Yao
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Jie
authors.initials: J
authors.lastname: Zhao
authors.forename: Guodong
authors.initials: G
authors.lastname: Chen
authors.forename: Qin
authors.initials: Q
authors.lastname: Wei
authors.forename: Bin
authors.initials: B
authors.lastname: Du
mesh_terms: D000332:Aerobiosis / Q000502:physiology; D000641:Ammonia / Q000378:metabolism*; D001419:Bacteria / Q000254:growth & development*; D019149:Bioreactors / Q000382:microbiology*; D009573:Nitrites / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D012722:Sewage / Q000382:microbiology*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D009573:Nitrites; D012722:Sewage; D000641:Ammonia; D009584:Nitrogen