Nitrous oxide emission in low-oxygen simultaneous nitrification and denitrification process: Sources and mechanisms

Jia, W; Liang, S; Zhang, J; Ngo, HH; Guo, W; Yan, Y; Zou, Y

Nitrous oxide emission in low-oxygen simultaneous nitrification and denitrification process: Sources and mechanisms

Jia, W Liang, S Zhang, J Ngo, HH

Guo, W

Yan, Y Zou, Y

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Publication Type:: Journal Article
Citation:: Bioresource Technology, 2013, 136 pp. 444 - 451
Issue Date:: 2013-01-01

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Field	Value	Language
dc.contributor.author	Jia, W	en_US
dc.contributor.author	Liang, S	en_US
dc.contributor.author	Zhang, J	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	Yan, Y	en_US
dc.contributor.author	Zou, Y	en_US
dc.date.available	2013-02-27	en_US
dc.date.issued	2013-01-01	en_US
dc.identifier.citation	Bioresource Technology, 2013, 136 pp. 444 - 451	en_US
dc.identifier.issn	0960-8524	en_US
dc.identifier.uri	http://hdl.handle.net/10453/26336
dc.description.abstract	This study attempts to elucidate the emission sources and mechanisms of nitrous oxide (N2O) during simultaneous nitrification and denitrification (SND) process under oxygen-limiting condition. The results indicated that N2O emitted during low-oxygen SND process was 0.8±0.1mgN/gMLSS, accounting for 7.7% of the nitrogen input. This was much higher than the reported results from conventional nitrification and denitrification processes. Batch experiments revealed that nitrifier denitrification was attributed as the dominant source of N2O production. This could be well explained by the change of ammonia-oxidizing bacteria (AOB) community caused by the low-oxygen condition. It was observed that during the low-oxygen SND process, AOB species capable of denitrification, i.e., Nitrosomonas europaea and Nitrosomonas-like, were enriched whilst the composition of denitrifiers was only slightly affected. N2O emission by heterotrophic denitrification was considered to be limited by the presence of oxygen and unavailability of carbon source. © 2013 Elsevier Ltd.	en_US
dc.relation.ispartof	Bioresource Technology	en_US
dc.relation.isbasedon	10.1016/j.biortech.2013.02.117	en_US
dc.subject.classification	Biotechnology	en_US
dc.subject.mesh	Bacteria	en_US
dc.subject.mesh	Oxygen	en_US
dc.subject.mesh	Nitrogen	en_US
dc.subject.mesh	Nitrous Oxide	en_US
dc.subject.mesh	Bioreactors	en_US
dc.subject.mesh	Phylogeny	en_US
dc.subject.mesh	Genes, Bacterial	en_US
dc.subject.mesh	Molecular Sequence Data	en_US
dc.subject.mesh	Heterotrophic Processes	en_US
dc.subject.mesh	Biological Oxygen Demand Analysis	en_US
dc.subject.mesh	Denitrification	en_US
dc.subject.mesh	Nitrification	en_US
dc.subject.mesh	Denaturing Gradient Gel Electrophoresis	en_US
dc.title	Nitrous oxide emission in low-oxygen simultaneous nitrification and denitrification process: Sources and mechanisms	en_US
dc.type	Journal Article
utslib.citation.volume	136	en_US
utslib.for	0904 Chemical Engineering	en_US
utslib.for	0907 Environmental Engineering	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	136	en_US

Abstract:

This study attempts to elucidate the emission sources and mechanisms of nitrous oxide (N2O) during simultaneous nitrification and denitrification (SND) process under oxygen-limiting condition. The results indicated that N2O emitted during low-oxygen SND process was 0.8±0.1mgN/gMLSS, accounting for 7.7% of the nitrogen input. This was much higher than the reported results from conventional nitrification and denitrification processes. Batch experiments revealed that nitrifier denitrification was attributed as the dominant source of N2O production. This could be well explained by the change of ammonia-oxidizing bacteria (AOB) community caused by the low-oxygen condition. It was observed that during the low-oxygen SND process, AOB species capable of denitrification, i.e., Nitrosomonas europaea and Nitrosomonas-like, were enriched whilst the composition of denitrifiers was only slightly affected. N2O emission by heterotrophic denitrification was considered to be limited by the presence of oxygen and unavailability of carbon source. © 2013 Elsevier Ltd.

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http://hdl.handle.net/10453/26336