Effects of activated sludge flocs and pellets seeds on aerobic granule properties
Huacheng Xu , Pinjing He , Guanzhao Wang , Liming Shao
DOI:
Received May 23, 2010,Revised July 12, 2010, Accepted , Available online
Volume 23,2011,Pages 537-544
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Aerobic granules seeded with activated sludge flocs and pellets (obtained from activated sludge flocs) were cultivated in two
sequencing batch reactors and their characteristics were compared. Compared with granules seeded with activated sludge flocs,
those seeded with pellets had shorter start-up time, larger diameter, better chemical oxygen demand removal e ciency, and higher
hydrophobicity, suspended solid concentration, and Mg2+ content. The di erent inocula led the granule surface with di erent microbial
morphologies, but did not result in di erent distribution patterns of extracellular polymeric substances and cells. The anaerobic
bacterium Anoxybacillus sp. was detected in the granules seeded with pellets. These results highlighted the advantage of pellet over
activated sludge floc as the seed for aerobic granulation and wastewater treatment.
