title: [Formation Mechanism of Aerobic Granular Sludge and Removal Efficiencies in Integrated ABR-CSTR Reactor].
abstract: Anaerobic Baffled Reactor (ABR) was altered to make an integrated anaerobic-aerobic reactor. The research investigated the mechanism of aerobic sludge granulation, under the condition of continuous-flow. The last two compartments of the ABR were altered into aeration tank and sedimentation tank respectively with seeded sludge of anaerobic granular sludge in anaerobic zone and conventional activated sludge in aerobic zone. The HRT was gradually decreased in sedimentation tank from 2.0 h to 0.75 h and organic loading rate was increased from 1.5 kg x (M3 x d)(-1) to 2.0 kg x (M3 x d)(-1) while the C/N of 2 was controlled in aerobic zone. When the system operated for 110 days, the mature granular sludge in aerobic zone were characterized by compact structure, excellent sedimentation performance (average sedimentation rate was 20.8 m x h(-1)) and slight yellow color. The system performed well in nitrogen and phosphorus removal under the conditions of setting time of 0.75 h and organic loading rate of 2.0 kg (m3 x d)(-1) in aerobic zone, the removal efficiencies of COD, NH4+ -N, TP and TN were 90%, 80%, 65% and 45%, respectively. The results showed that the increasing selection pressure and the high organic loading rate were the main propulsions of the aerobic sludge granulation.
authors.forename: Kai-cheng
authors.initials: KC
authors.lastname: Wu
authors.forename: Peng
authors.initials: P
authors.lastname: Wu
authors.forename: Yue-zhong
authors.initials: YZ
authors.lastname: Xu
authors.forename: Yue-han
authors.initials: YH
authors.lastname: Li
authors.forename: Yao-liang
authors.initials: YL
authors.lastname: Shen
mesh_terms: D019149:Bioreactors; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D010758:Phosphorus; D009584:Nitrogen