Mathematical Modeling of Nitrous Oxide Production during Denitrifying Phosphorus Removal Process

Liu, Y; Peng, L; Chen, X; Ni, BJ

Mathematical Modeling of Nitrous Oxide Production during Denitrifying Phosphorus Removal Process

Liu, Y

Peng, L Chen, X Ni, BJ

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Publication Type:: Journal Article
Citation:: Environmental Science and Technology, 2015, 49 (14), pp. 8595 - 8601
Issue Date:: 2015-07-21

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Field	Value	Language
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961	en_US
dc.contributor.author	Peng, L	en_US
dc.contributor.author	Chen, X	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.date.issued	2015-07-21	en_US
dc.identifier.citation	Environmental Science and Technology, 2015, 49 (14), pp. 8595 - 8601	en_US
dc.identifier.issn	0013-936X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/119143
dc.description.abstract	© 2015 American Chemical Society. A denitrifying phosphorus removal process undergoes frequent alternating anaerobic/anoxic conditions to achieve phosphate release and uptake, during which microbial internal storage polymers (e.g., Polyhydroxyalkanoate (PHA)) could be produced and consumed dynamically. The PHA turnovers play important roles in nitrous oxide (N2O) accumulation during the denitrifying phosphorus removal process. In this work, a mathematical model is developed to describe N2O dynamics and the key role of PHA consumption on N2O accumulation during the denitrifying phosphorus removal process for the first time. In this model, the four-step anoxic storage of polyphosphate and four-step anoxic growth on PHA using nitrate, nitrite, nitric oxide (NO), and N2O consecutively by denitrifying polyphosphate accumulating organisms (DPAOs) are taken into account for describing all potential N2O accumulation steps in the denitrifying phosphorus removal process. The developed model is successfully applied to reproduce experimental data on N2O production obtained from four independent denitrifying phosphorus removal study reports with different experimental conditions. The model satisfactorily describes the N2O accumulation, nitrogen reduction, phosphate release and uptake, and PHA dynamics for all systems, suggesting the validity and applicability of the model. The results indicated a substantial role of PHA consumption in N2O accumulation due to the relatively low N2O reduction rate by using PHA during denitrifying phosphorus removal.	en_US
dc.relation.ispartof	Environmental Science and Technology	en_US
dc.relation.isbasedon	10.1021/acs.est.5b01650	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.mesh	Nitrates	en_US
dc.subject.mesh	Nitrites	en_US
dc.subject.mesh	Polyphosphates	en_US
dc.subject.mesh	Phosphorus	en_US
dc.subject.mesh	Nitrous Oxide	en_US
dc.subject.mesh	Confidence Intervals	en_US
dc.subject.mesh	Models, Theoretical	en_US
dc.subject.mesh	Denitrification	en_US
dc.title	Mathematical Modeling of Nitrous Oxide Production during Denitrifying Phosphorus Removal Process	en_US
dc.type	Journal Article
utslib.citation.volume	14	en_US
utslib.citation.volume	49	en_US
utslib.for	090409 Wastewater Treatment Processes	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	closed_access
pubs.issue	14	en_US
pubs.publication-status	Published	en_US
pubs.volume	49	en_US

Abstract:

© 2015 American Chemical Society. A denitrifying phosphorus removal process undergoes frequent alternating anaerobic/anoxic conditions to achieve phosphate release and uptake, during which microbial internal storage polymers (e.g., Polyhydroxyalkanoate (PHA)) could be produced and consumed dynamically. The PHA turnovers play important roles in nitrous oxide (N2O) accumulation during the denitrifying phosphorus removal process. In this work, a mathematical model is developed to describe N2O dynamics and the key role of PHA consumption on N2O accumulation during the denitrifying phosphorus removal process for the first time. In this model, the four-step anoxic storage of polyphosphate and four-step anoxic growth on PHA using nitrate, nitrite, nitric oxide (NO), and N2O consecutively by denitrifying polyphosphate accumulating organisms (DPAOs) are taken into account for describing all potential N2O accumulation steps in the denitrifying phosphorus removal process. The developed model is successfully applied to reproduce experimental data on N2O production obtained from four independent denitrifying phosphorus removal study reports with different experimental conditions. The model satisfactorily describes the N2O accumulation, nitrogen reduction, phosphate release and uptake, and PHA dynamics for all systems, suggesting the validity and applicability of the model. The results indicated a substantial role of PHA consumption in N2O accumulation due to the relatively low N2O reduction rate by using PHA during denitrifying phosphorus removal.

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http://hdl.handle.net/10453/119143