Title: The effects of different aeration patterns on aerobic granulation

Authors: Li-Li Liu, Zhi-Ping Wang, Jie Yao, Wei-Min Cai

Addresses: School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China. ' School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China. ' School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China. ' School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China

Abstract: 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.

Keywords: aerobic granular sludge; glucose; SBR; sequencing batch reactors; extra-aeration; intra-aeration; aeration patterns; aerobic granulation; wastewater treatment; environmental biotechnology.

DOI: 10.1504/IJEP.2009.024467

International Journal of Environment and Pollution, 2009 Vol.37 No.1, pp.5 - 19

Published online: 06 Apr 2009 *

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