title: [Influence of organic loading rate on the start-up of a sequencing airlift aerobic granular reactor].
abstract: The cultivation and stability of aerobic granular sludge in a three sequencing airlift internal-loop aerobic granular fluidized beds (R1-R3) under different organic loading rates (OLR) were investigated, where the selective pressure was un-controlled. R1 and R2 were start-up at the COD loading of 7 kg x (m3 x d)(-1) and 3 kg x (m3 x d)(-1) respectively, and R3 was start-up at an increasing COD loading rates of 1.5-3 kg x (m3 x d)(-1). The results showed that the aerobic granules could be formed successfully in all the reactors, however, filamentous bulking happened as the reactor was start-up at an aimed OLR (R1 and R2). It seems the overgrowth of filamentous could be controlled effectively by means of increasing OLR gradually. The granular development characteristics, the physical characteristics and extracellular polymeric substances contents were analyzed especially during the aerobic granules cultivation. Compared with the granules in R1 and R2, aerobic granules formed in R3 presented clearer outer morphology and compact structure, advanced COD removal efficiency and a significant increase in polysaccharides, resulted an enhanced stability.
authors.affiliation: Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130026, China. notatall.student@sina.com
authors.forename: Meng-Yuan
authors.initials: MY
authors.lastname: Liu
authors.forename: Dan-Dan
authors.initials: DD
authors.lastname: Zhou
authors.forename: Lin-Lin
authors.initials: LL
authors.lastname: Gao
authors.forename: De-Fang
authors.initials: DF
authors.lastname: Ma
authors.forename: Yu-Meng
authors.initials: YM
authors.lastname: Zhang
authors.forename: Ke-Yu
authors.initials: KY
authors.lastname: Li
mesh_terms: D000332:Aerobiosis; D019149:Bioreactors / Q000382:microbiology; D009930:Organic Chemicals / Q000302:isolation & purification / Q000378:metabolism*; D010316:Particle Size; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D009930:Organic Chemicals; D012722:Sewage