Modeling of nitrous oxide production by autotrophic ammonia-oxidizing bacteria with multiple production pathways.

Ni, B-J; Peng, L; Law, Y; Guo, J; Yuan, Z

Modeling of nitrous oxide production by autotrophic ammonia-oxidizing bacteria with multiple production pathways.

Ni, B-J Peng, L Law, Y Guo, J Yuan, Z

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: Environ Sci Technol, 2014, 48, (7), pp. 3916-3924
Issue Date:: 2014-04-01

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Field	Value	Language
dc.contributor.author	Ni, B-J
dc.contributor.author	Peng, L
dc.contributor.author	Law, Y
dc.contributor.author	Guo, J
dc.contributor.author	Yuan, Z
dc.date.accessioned	2023-03-23T23:13:19Z
dc.date.available	2023-03-23T23:13:19Z
dc.date.issued	2014-04-01
dc.identifier.citation	Environ Sci Technol, 2014, 48, (7), pp. 3916-3924
dc.identifier.issn	0013-936X
dc.identifier.issn	1520-5851
dc.identifier.uri	http://hdl.handle.net/10453/168282
dc.description.abstract	Autotrophic ammonia oxidizing bacteria (AOB) have been recognized as a major contributor to N2O production in wastewater treatment systems. However, so far N2O models have been proposed based on a single N2O production pathway by AOB, and there is still a lack of effective approach for the integration of these models. In this work, an integrated mathematical model that considers multiple production pathways is developed to describe N2O production by AOB. The pathways considered include the nitrifier denitrification pathway (N2O as the final product of AOB denitrification with NO2(-) as the terminal electron acceptor) and the hydroxylamine (NH2OH) pathway (N2O as a byproduct of incomplete oxidation of NH2OH to NO2(-)). In this model, the oxidation and reduction processes are modeled separately, with intracellular electron carriers introduced to link the two types of processes. The model is calibrated and validated using experimental data obtained with two independent nitrifying cultures. The model satisfactorily describes the N2O data from both systems. The model also predicts shifts of the dominating pathway at various dissolved oxygen (DO) and nitrite levels, consistent with previous hypotheses. This unified model is expected to enhance our ability to predict N2O production by AOB in wastewater treatment systems under varying operational conditions.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	AMER CHEMICAL SOC
dc.relation	http://purl.org/au-research/grants/arc/DE130100451
dc.relation	http://purl.org/au-research/grants/arc/DP130103147
dc.relation.ispartof	Environ Sci Technol
dc.relation.isbasedon	10.1021/es405592h
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Ammonia
dc.subject.mesh	Autotrophic Processes
dc.subject.mesh	Bacteria
dc.subject.mesh	Biodegradation, Environmental
dc.subject.mesh	Calibration
dc.subject.mesh	Denitrification
dc.subject.mesh	Models, Biological
dc.subject.mesh	Nitrites
dc.subject.mesh	Nitrous Oxide
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Oxygen
dc.subject.mesh	Reproducibility of Results
dc.subject.mesh	Bacteria
dc.subject.mesh	Nitrites
dc.subject.mesh	Oxygen
dc.subject.mesh	Ammonia
dc.subject.mesh	Nitrous Oxide
dc.subject.mesh	Calibration
dc.subject.mesh	Reproducibility of Results
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Models, Biological
dc.subject.mesh	Biodegradation, Environmental
dc.subject.mesh	Autotrophic Processes
dc.subject.mesh	Denitrification
dc.subject.mesh	Ammonia
dc.subject.mesh	Autotrophic Processes
dc.subject.mesh	Bacteria
dc.subject.mesh	Biodegradation, Environmental
dc.subject.mesh	Calibration
dc.subject.mesh	Denitrification
dc.subject.mesh	Models, Biological
dc.subject.mesh	Nitrites
dc.subject.mesh	Nitrous Oxide
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Oxygen
dc.subject.mesh	Reproducibility of Results
dc.title	Modeling of nitrous oxide production by autotrophic ammonia-oxidizing bacteria with multiple production pathways.
dc.type	Journal Article
utslib.citation.volume	48
utslib.location.activity	United States
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	closed_access	*
dc.date.updated	2023-03-23T23:13:18Z
pubs.issue	7
pubs.publication-status	Published
pubs.volume	48
utslib.citation.issue	7

Abstract:

Autotrophic ammonia oxidizing bacteria (AOB) have been recognized as a major contributor to N2O production in wastewater treatment systems. However, so far N2O models have been proposed based on a single N2O production pathway by AOB, and there is still a lack of effective approach for the integration of these models. In this work, an integrated mathematical model that considers multiple production pathways is developed to describe N2O production by AOB. The pathways considered include the nitrifier denitrification pathway (N2O as the final product of AOB denitrification with NO2(-) as the terminal electron acceptor) and the hydroxylamine (NH2OH) pathway (N2O as a byproduct of incomplete oxidation of NH2OH to NO2(-)). In this model, the oxidation and reduction processes are modeled separately, with intracellular electron carriers introduced to link the two types of processes. The model is calibrated and validated using experimental data obtained with two independent nitrifying cultures. The model satisfactorily describes the N2O data from both systems. The model also predicts shifts of the dominating pathway at various dissolved oxygen (DO) and nitrite levels, consistent with previous hypotheses. This unified model is expected to enhance our ability to predict N2O production by AOB in wastewater treatment systems under varying operational conditions.

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http://hdl.handle.net/10453/168282