Keywords: aerobic granular sludge, glucose, SBR, sequencing batch reactors, extra-aeration, intra-aeration, aeration patterns, aerobic granulation, wastewater treatment, environmental biotechnology
The effects of different aeration patterns on aerobic granulation
In this study, the effects of aeration patterns in terms of intra- (S1) and extra- (S2) aeration on aerobic granulation were investigated. Granules developed in S1 were retarded due to the high shear force of highly mixed air bubbles, and they were more solid while the S2 granules were porous with many distinct pores and channels. Mature granules in two series had comparable specific oxygen uptake rate and ammonium-nitrogen uptake rate, which were 37.57 and 39.64 mg O2/(gMLSS ⋅ h), 6.44 and 4.03 mg NH3-N/ (gMLSS ⋅ h) respectively. Moreover, S1 granules contained more extracellular polymeric substances and higher exopolysaccharide content, which resulted higher negative charges.