Evaluating the Role of Microbial Internal Storage Turnover on Nitrous Oxide Accumulation during Denitrification

Liu, Y; Peng, L; Guo, J; Chen, X; Yuan, Z; Ni, BJ

Evaluating the Role of Microbial Internal Storage Turnover on Nitrous Oxide Accumulation during Denitrification

Liu, Y

Peng, L Guo, J Chen, X Yuan, Z Ni, BJ

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Publication Type:: Journal Article
Citation:: Scientific Reports, 2015, 5
Issue Date:: 2015-10-14

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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	Guo, J	en_US
dc.contributor.author	Chen, X	en_US
dc.contributor.author	Yuan, Z	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.date.available	2015-09-18	en_US
dc.date.issued	2015-10-14	en_US
dc.identifier.citation	Scientific Reports, 2015, 5	en_US
dc.identifier.uri	http://hdl.handle.net/10453/119022
dc.description.abstract	Biological wastewater treatment processes under a dynamic regime with respect to carbon substrate can result in microbial storage of internal polymers (e.g., polyhydroxybutyrate (PHB)) and their subsequent utilizations. These storage turnovers play important roles in nitrous oxide (N2 O) accumulation during heterotrophic denitrification in biological wastewater treatment. In this work, a mathematical model is developed to evaluate the key role of PHB storage turnovers on N 2 O accumulation during denitrification for the first time, aiming to establish the key relationship between N2 O accumulation and PHB storage production. The model is successfully calibrated and validated using N2 O data from two independent experimental systems with PHB storage turnovers. The model satisfactorily describes nitrogen reductions, PHB storage/utilization, and N2 O accumulation from both systems. The results reveal a linear relationship between N2 O accumulation and PHB production, suggesting a substantial effect of PHB storage on N2 O accumulation during denitrification. Application of the model to simulate long-term operations of a denitrifying sequencing batch reactor and a denitrifying continuous system indicates the feeding pattern and sludge retention time would alter PHB turnovers and thus affect N2 O accumulation. Increasing PHB utilization could substantially raise N2 O accumulation due to the relatively low N2 O reduction rate when using PHB as carbon source.	en_US
dc.relation.ispartof	Scientific Reports	en_US
dc.relation.isbasedon	10.1038/srep15138	en_US
dc.subject.mesh	Bacteria, Anaerobic	en_US
dc.subject.mesh	Nitrates	en_US
dc.subject.mesh	Nitrous Oxide	en_US
dc.subject.mesh	Hydroxybutyrates	en_US
dc.subject.mesh	Polyesters	en_US
dc.subject.mesh	Metabolic Clearance Rate	en_US
dc.subject.mesh	Bioreactors	en_US
dc.subject.mesh	Cell Proliferation	en_US
dc.subject.mesh	Models, Biological	en_US
dc.subject.mesh	Computer Simulation	en_US
dc.subject.mesh	Biodegradation, Environmental	en_US
dc.subject.mesh	Denitrification	en_US
dc.title	Evaluating the Role of Microbial Internal Storage Turnover on Nitrous Oxide Accumulation during Denitrification	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.for	0904 Chemical 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	5	en_US

Abstract:

Biological wastewater treatment processes under a dynamic regime with respect to carbon substrate can result in microbial storage of internal polymers (e.g., polyhydroxybutyrate (PHB)) and their subsequent utilizations. These storage turnovers play important roles in nitrous oxide (N2 O) accumulation during heterotrophic denitrification in biological wastewater treatment. In this work, a mathematical model is developed to evaluate the key role of PHB storage turnovers on N 2 O accumulation during denitrification for the first time, aiming to establish the key relationship between N2 O accumulation and PHB storage production. The model is successfully calibrated and validated using N2 O data from two independent experimental systems with PHB storage turnovers. The model satisfactorily describes nitrogen reductions, PHB storage/utilization, and N2 O accumulation from both systems. The results reveal a linear relationship between N2 O accumulation and PHB production, suggesting a substantial effect of PHB storage on N2 O accumulation during denitrification. Application of the model to simulate long-term operations of a denitrifying sequencing batch reactor and a denitrifying continuous system indicates the feeding pattern and sludge retention time would alter PHB turnovers and thus affect N2 O accumulation. Increasing PHB utilization could substantially raise N2 O accumulation due to the relatively low N2 O reduction rate when using PHB as carbon source.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/119022