Effect of fluctuating hydraulic retention time (HRT) on denitrification in the UASB reactors

Niu, W; Guo, J; Lian, J; Ngo, HH; Li, H; Song, Y; Yin, P

Effect of fluctuating hydraulic retention time (HRT) on denitrification in the UASB reactors

Niu, W Guo, J Lian, J Ngo, HH

Li, H Song, Y Yin, P

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Publication Type:: Journal Article
Citation:: Biochemical Engineering Journal, 2018, 132 pp. 29 - 37
Issue Date:: 2018-04-15

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Field	Value	Language
dc.contributor.author	Niu, W	en_US
dc.contributor.author	Guo, J	en_US
dc.contributor.author	Lian, J	en_US
dc.contributor.author	Ngo, HH https://orcid.org/0000-0002-0296-2866	en_US
dc.contributor.author	Li, H	en_US
dc.contributor.author	Song, Y	en_US
dc.contributor.author	Yin, P	en_US
dc.date.available	2020-05-25T19:11:04Z
dc.date.issued	2018-04-15	en_US
dc.identifier.citation	Biochemical Engineering Journal, 2018, 132 pp. 29 - 37	en_US
dc.identifier.issn	1369-703X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/128040
dc.description.abstract	© 2017 Elsevier B.V. This study cultivated denitrifying granular sludge in three up-flow anaerobic sludge blanket (UASB) reactors using different fluctuation hydraulic retention time (HRT) strategies (reactor 1 (RC): constant HRT (C-HRT); reactor 2 (RDF): downward fluctuation HRT (DF-HRT); and reactor 3 (RUF): upward fluctuation HRT (UF-HRT)). The results verified that these fluctuation HRT strategies could enhance microbial diversity, while robust against fluctuations in nutrient load of the denitrifying granular sludge. Microbial aggregates appeared in RC, RUF and RDF on days 22, 12 and 7, respectively. The sludge in RUF and RDF achieved complete granulation on days 22 and 14, respectively. Compared to the results of RC and RUF, the acyl homoserine lactones (AHLs) concentration rapidly increased, and changed the components of extracellular polymeric substances (EPS) resulted in the rapid formation of denitrifying granular sludge in RDF. These results demonstrate that microbial community, AHLs, EPS, and the denitrifying sludge granulation process were associated with each other. Informed from quorum sensing system, a mechanism for the granulation of denitrifying sludge using the DF-HRT strategy was proposed. The DF-HRT strategy is an economical and fast method to cultivate denitrifying granular sludge. We hope that the results of our research would provide some theoretical support for wastewater producing unstable plants.	en_US
dc.relation.ispartof	Biochemical Engineering Journal	en_US
dc.relation.isbasedon	10.1016/j.bej.2017.12.017	en_US
dc.subject.classification	Biotechnology	en_US
dc.title	Effect of fluctuating hydraulic retention time (HRT) on denitrification in the UASB reactors	en_US
dc.type	Journal Article
utslib.citation.volume	132	en_US
utslib.for	0904 Chemical Engineering	en_US
utslib.for	1003 Industrial Biotechnology	en_US
utslib.for	0601 Biochemistry and Cell Biology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	132	en_US

Abstract:

© 2017 Elsevier B.V. This study cultivated denitrifying granular sludge in three up-flow anaerobic sludge blanket (UASB) reactors using different fluctuation hydraulic retention time (HRT) strategies (reactor 1 (RC): constant HRT (C-HRT); reactor 2 (RDF): downward fluctuation HRT (DF-HRT); and reactor 3 (RUF): upward fluctuation HRT (UF-HRT)). The results verified that these fluctuation HRT strategies could enhance microbial diversity, while robust against fluctuations in nutrient load of the denitrifying granular sludge. Microbial aggregates appeared in RC, RUF and RDF on days 22, 12 and 7, respectively. The sludge in RUF and RDF achieved complete granulation on days 22 and 14, respectively. Compared to the results of RC and RUF, the acyl homoserine lactones (AHLs) concentration rapidly increased, and changed the components of extracellular polymeric substances (EPS) resulted in the rapid formation of denitrifying granular sludge in RDF. These results demonstrate that microbial community, AHLs, EPS, and the denitrifying sludge granulation process were associated with each other. Informed from quorum sensing system, a mechanism for the granulation of denitrifying sludge using the DF-HRT strategy was proposed. The DF-HRT strategy is an economical and fast method to cultivate denitrifying granular sludge. We hope that the results of our research would provide some theoretical support for wastewater producing unstable plants.

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http://hdl.handle.net/10453/128040