Impact of coexistence of sludge flocs on nitrous oxide production in a granule-based nitrification system: A model-based evaluation

Liu, Y; Ngo, HH; Guo, W; Wang, D; Peng, L; Wei, W; Ni, BJ

Impact of coexistence of sludge flocs on nitrous oxide production in a granule-based nitrification system: A model-based evaluation

Liu, Y

Ngo, HH

Guo, W

Wang, D Peng, L Wei, W Ni, BJ

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Publication Type:: Journal Article
Citation:: Water Research, 2020, 170
Issue Date:: 2020-03-01

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Field	Value	Language
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961	en_US
dc.contributor.author	Ngo, HH https://orcid.org/0000-0002-0296-2866	en_US
dc.contributor.author	Guo, W https://orcid.org/0000-0001-5542-2858	en_US
dc.contributor.author	Wang, D	en_US
dc.contributor.author	Peng, L	en_US
dc.contributor.author	Wei, W	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.date.available	2019-11-14	en_US
dc.date.issued	2020-03-01	en_US
dc.identifier.citation	Water Research, 2020, 170	en_US
dc.identifier.issn	0043-1354	en_US
dc.identifier.uri	http://hdl.handle.net/10453/137232
dc.description.abstract	© 2019 Elsevier Ltd A common operational status of granule-based reactor is the inevitable coexistence of sludge flocs. Such hybrid system could have a profound impact on nitrous oxide (N2O) production in nitrifying process. In this work, a mathematical model is employed to evaluate the key role of the coexistence of sludge flocs on N2O production in a granule-based nitrifying system for the first time, by considering both nitrifier denitrification and hydroxylamine oxidation pathways. The modelling results show that the N2O production gradually decreases with the increase of the percentage of sludge flocs in the total biomass (10–60%). More N2O is tended to be generated in sludge flocs which has lower N2O production capacity compared to granular biomass, thus lowering the total N2O production. The relative contributions of two N2O production pathways are only affected by bulk dissolved oxygen (DO) for the sludge flocs in the hybrid system, whereas those are affected by both bulk DO and the fractions of sludge flocs for the granular biomass. The results reveal a substantial effect of the coexistence of sludge flocs on N2O production in granule-based nitrifying process, which should not be ignored in future design and operation.	en_US
dc.relation	http://purl.org/au-research/grants/arc/FT160100195
dc.relation.ispartof	Water Research	en_US
dc.relation.isbasedon	10.1016/j.watres.2019.115312	en_US
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Environmental Engineering	en_US
dc.subject.mesh	Nitrous Oxide	en_US
dc.subject.mesh	Bioreactors	en_US
dc.subject.mesh	Sewage	en_US
dc.subject.mesh	Denitrification	en_US
dc.subject.mesh	Nitrification	en_US
dc.title	Impact of coexistence of sludge flocs on nitrous oxide production in a granule-based nitrification system: A model-based evaluation	en_US
dc.type	Journal Article
utslib.citation.volume	170	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	*
utslib.copyright.embargo	2022-03-01T00:00:00+1100
pubs.publication-status	Published	en_US
pubs.volume	170	en_US

Abstract:

© 2019 Elsevier Ltd A common operational status of granule-based reactor is the inevitable coexistence of sludge flocs. Such hybrid system could have a profound impact on nitrous oxide (N2O) production in nitrifying process. In this work, a mathematical model is employed to evaluate the key role of the coexistence of sludge flocs on N2O production in a granule-based nitrifying system for the first time, by considering both nitrifier denitrification and hydroxylamine oxidation pathways. The modelling results show that the N2O production gradually decreases with the increase of the percentage of sludge flocs in the total biomass (10–60%). More N2O is tended to be generated in sludge flocs which has lower N2O production capacity compared to granular biomass, thus lowering the total N2O production. The relative contributions of two N2O production pathways are only affected by bulk dissolved oxygen (DO) for the sludge flocs in the hybrid system, whereas those are affected by both bulk DO and the fractions of sludge flocs for the granular biomass. The results reveal a substantial effect of the coexistence of sludge flocs on N2O production in granule-based nitrifying process, which should not be ignored in future design and operation.

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http://hdl.handle.net/10453/137232