Title: Effect of extended feeding time on aerobic granulation in SBR

Authors: Zhi-Hua Li, Takahiro Kuba, Tetsuya Kusuda, Xiao-Chang Wang

Addresses: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China. ' Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. ' Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. ' School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China

Abstract: Two different feeding lengths were applied to control the granule size. It was found that the size of granules was considerably controlled in R2 (60 min for feeding). However, the settleability in R2 was not as good as that in R1 (12 min for feeding). However, this approach of controlling the granule size also loosens the structure concerning on the difference between SVI5 and SVI30, which might lead to instability in the long term. Based on the observation of the ash-solids fraction of biomass, it was confirmed that frequent update of granules mainly happened on the surface of granules.

Keywords: activated sludge; aerobic granulation; ash-solids fraction; extending feeding time; granular sludge; granule update; sequence batch reactors; SBR; size distribution; substrate gradient; stability; wastewater treatment; granule size; biomass.

DOI: 10.1504/WRSTSD.2009.031833

World Review of Science, Technology and Sustainable Development, 2009 Vol.6 No.2/3/4, pp.104 - 114

Published online: 25 Feb 2010 *

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