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 mor...

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Main Authors: Liu, Yong-Qiang., Tay, Joo Hwa.
Format: Journal Article
Language:English
Published: 2013
Subjects:
Online Access:https://hdl.handle.net/10356/98756
http://hdl.handle.net/10220/16244
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author Liu, Yong-Qiang.
Tay, Joo Hwa.
author_facet Liu, Yong-Qiang.
Tay, Joo Hwa.
author_sort Liu, Yong-Qiang.
collection NTU
description 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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spelling ntu-10356/987562020-03-07T12:48:42Z The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor Liu, Yong-Qiang. Tay, Joo Hwa. DRNTU::Engineering::Environmental engineering 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. 2013-10-04T02:21:59Z 2019-12-06T19:59:21Z 2013-10-04T02:21:59Z 2019-12-06T19:59:21Z 2012 2012 Journal Article Liu, Y. Q., & Tay, J. H. (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. https://hdl.handle.net/10356/98756 http://hdl.handle.net/10220/16244 10.1080/09593330.2012.673011 en Environmental technology
spellingShingle DRNTU::Engineering::Environmental engineering
Liu, Yong-Qiang.
Tay, Joo Hwa.
The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor
title The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor
title_full The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor
title_fullStr The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor
title_full_unstemmed The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor
title_short The competition between flocculent sludge and aerobic granules during the long-term operation period of granular sludge sequencing batch reactor
title_sort competition between flocculent sludge and aerobic granules during the long term operation period of granular sludge sequencing batch reactor
topic DRNTU::Engineering::Environmental engineering
url https://hdl.handle.net/10356/98756
http://hdl.handle.net/10220/16244
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