Resistance and resilience of nitrifying bacteria in aerobic granules to pH shock
Resistance and resilience of nitrifying bacteria in aerobic granules to pH shock
To investigate the response difference between flocculent sludge and granular sludge in unfavourable environmental conditions, 1-h pH shock was exerted to both granular sludge and flocculent sludge with the same biomass concentration and the same population sizes of nitrifying bacteria. It was found that nitrite-oxidizing bacteria (NOB) were more sensitive to pH than ammonia-oxidizing bacteria (AOB). In addition, the deviation of 3 pH units to alkaline from the optimal pH was much more detrimental to AOB and NOB in both flocculent sludge and granular sludge compared with the deviation of 3 pH units to acidic. However, respirometric activities of both AOB and NOB in granular sludge after pH shock at 5 and 11 were much higher than those in the flocculent sludge. The recovery of nitrifying activities by only one batch culture indicated that nitrifying bacteria in granular sludge experienced a much less irreversible loss compared with flocculent sludge. The results in this study showed that compact structure and the big size of granules could play a buffering role to unfavourable conditions which resulted in a much higher resistance and resilience to shock.
aerobic granules, flocculent sludge, nitrification, pH shock, recovery
91-97
Liu, Y.-Q.
75adc6f8-aa83-484e-9e87-6c8442e344fa
Lan, G.-H.
544eebae-db3b-4c99-85ac-0a4fbf758a9d
Zeng, P.
1b581a2a-0125-4fa9-81a0-5b0aedaf7d99
July 2015
Liu, Y.-Q.
75adc6f8-aa83-484e-9e87-6c8442e344fa
Lan, G.-H.
544eebae-db3b-4c99-85ac-0a4fbf758a9d
Zeng, P.
1b581a2a-0125-4fa9-81a0-5b0aedaf7d99
Liu, Y.-Q., Lan, G.-H. and Zeng, P.
(2015)
Resistance and resilience of nitrifying bacteria in aerobic granules to pH shock.
Letters in Applied Microbiology, 61 (1), .
(doi:10.1111/lam.12433).
Abstract
To investigate the response difference between flocculent sludge and granular sludge in unfavourable environmental conditions, 1-h pH shock was exerted to both granular sludge and flocculent sludge with the same biomass concentration and the same population sizes of nitrifying bacteria. It was found that nitrite-oxidizing bacteria (NOB) were more sensitive to pH than ammonia-oxidizing bacteria (AOB). In addition, the deviation of 3 pH units to alkaline from the optimal pH was much more detrimental to AOB and NOB in both flocculent sludge and granular sludge compared with the deviation of 3 pH units to acidic. However, respirometric activities of both AOB and NOB in granular sludge after pH shock at 5 and 11 were much higher than those in the flocculent sludge. The recovery of nitrifying activities by only one batch culture indicated that nitrifying bacteria in granular sludge experienced a much less irreversible loss compared with flocculent sludge. The results in this study showed that compact structure and the big size of granules could play a buffering role to unfavourable conditions which resulted in a much higher resistance and resilience to shock.
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Accepted/In Press date: 16 April 2015
e-pub ahead of print date: 19 May 2015
Published date: July 2015
Keywords:
aerobic granules, flocculent sludge, nitrification, pH shock, recovery
Organisations:
Water & Environmental Engineering Group
Identifiers
Local EPrints ID: 377697
URI: http://eprints.soton.ac.uk/id/eprint/377697
ISSN: 0266-8254
PURE UUID: 565df820-626d-4e13-909f-0112897d3ba5
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Date deposited: 16 Jun 2015 10:00
Last modified: 15 Mar 2024 03:47
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Author:
G.-H. Lan
Author:
P. Zeng
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