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The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor

The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor
The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor
The long-term operational stability of aerobic granular sludge reactor was investigated in this study. It was found that the fraction of flocculent sludge fluctuated from 5 to 35%, even with a settling time of less than 5 minutes and manual discharge of flocculent sludge during a steady state of more than 400 days. Although the microbial community structure of flocculent sludge was similar to that of granular sludge co-existing in the reactor, the specific growth rate, the observed biomass yield and the specific oxygen consumption rate of flocculent sludge were much higher than those of granular sludge with identical microbial community structures. Therefore, the presence of flocculent sludge in the granular sludge reactor is mainly because of the kinetic superiority of flocculent sludge over granular sludge, rather than microbial competition. Increasing mass transfer in the feast period or discharging excess flocculent sludge could enhance the growth of granular sludge and improve the stability of the long-term operation of the granular sludge reactor
0959-3330
2619-2626
Liu, Yong-Qiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Tay, Joo-Hwa
1bd3ce87-355e-460f-835b-56cb81f3a1b0
Liu, Yong-Qiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Tay, Joo-Hwa
1bd3ce87-355e-460f-835b-56cb81f3a1b0

Liu, Yong-Qiang and Tay, Joo-Hwa (2012) The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor. Environmental Technology, 33 (23), 2619-2626. (doi:10.1080/09593330.2012.673011).

Record type: Article

Abstract

The long-term operational stability of aerobic granular sludge reactor was investigated in this study. It was found that the fraction of flocculent sludge fluctuated from 5 to 35%, even with a settling time of less than 5 minutes and manual discharge of flocculent sludge during a steady state of more than 400 days. Although the microbial community structure of flocculent sludge was similar to that of granular sludge co-existing in the reactor, the specific growth rate, the observed biomass yield and the specific oxygen consumption rate of flocculent sludge were much higher than those of granular sludge with identical microbial community structures. Therefore, the presence of flocculent sludge in the granular sludge reactor is mainly because of the kinetic superiority of flocculent sludge over granular sludge, rather than microbial competition. Increasing mass transfer in the feast period or discharging excess flocculent sludge could enhance the growth of granular sludge and improve the stability of the long-term operation of the granular sludge reactor

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More information

Published date: 24 April 2012
Organisations: Civil Maritime & Env. Eng & Sci Unit

Identifiers

Local EPrints ID: 351878
URI: http://eprints.soton.ac.uk/id/eprint/351878
ISSN: 0959-3330
PURE UUID: 3eae8bdf-cd86-47d3-b77d-36ced9e85a03

Catalogue record

Date deposited: 25 Apr 2013 14:19
Last modified: 16 Jul 2019 21:35

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