Full-Scale Modeling Explaining Large Spatial Variations of Nitrous Oxide Fluxes in a Step-Feed Plug-Flow Wastewater Treatment Reactor.

Ni, B-J; Pan, Y; van den Akker, B; Ye, L; Yuan, Z

Full-Scale Modeling Explaining Large Spatial Variations of Nitrous Oxide Fluxes in a Step-Feed Plug-Flow Wastewater Treatment Reactor.

Ni, B-J Pan, Y van den Akker, B Ye, L Yuan, Z

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: Environ Sci Technol, 2015, 49, (15), pp. 9176-9184
Issue Date:: 2015-08-04

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Field	Value	Language
dc.contributor.author	Ni, B-J
dc.contributor.author	Pan, Y
dc.contributor.author	van den Akker, B
dc.contributor.author	Ye, L
dc.contributor.author	Yuan, Z
dc.date.accessioned	2023-03-23T23:01:07Z
dc.date.available	2023-03-23T23:01:07Z
dc.date.issued	2015-08-04
dc.identifier.citation	Environ Sci Technol, 2015, 49, (15), pp. 9176-9184
dc.identifier.issn	0013-936X
dc.identifier.issn	1520-5851
dc.identifier.uri	http://hdl.handle.net/10453/168270
dc.description.abstract	Nitrous oxide (N2O) emission data collected from wastewater treatment plants (WWTPs) show huge variations between plants and within one plant (both spatially and temporarily). Such variations and the relative contributions of various N2O production pathways are not fully understood. This study applied a previously established N2O model incorporating two currently known N2O production pathways by ammonia-oxidizing bacteria (AOB) (namely the AOB denitrification and the hydroxylamine pathways) and the N2O production pathway by heterotrophic denitrifiers to describe and provide insights into the large spatial variations of N2O fluxes in a step-feed full-scale activated sludge plant. The model was calibrated and validated by comparing simulation results with 40 days of N2O emission monitoring data as well as other water quality parameters from the plant. The model demonstrated that the relatively high biomass specific nitrogen loading rate in the Second Step of the reactor was responsible for the much higher N2O fluxes from this section. The results further revealed the AOB denitrification pathway decreased and the NH2OH oxidation pathway increased along the path of both Steps due to the increasing dissolved oxygen concentration. The overall N2O emission from this step-feed WWTP would be largely mitigated if 30% of the returned sludge were returned to the Second Step to reduce its biomass nitrogen loading rate.
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/acs.est.5b02038
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Air Pollutants
dc.subject.mesh	Ammonia
dc.subject.mesh	Biodegradation, Environmental
dc.subject.mesh	Bioreactors
dc.subject.mesh	Calibration
dc.subject.mesh	Models, Theoretical
dc.subject.mesh	Nitrous Oxide
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Reproducibility of Results
dc.subject.mesh	Sewage
dc.subject.mesh	Wastewater
dc.subject.mesh	Water Purification
dc.subject.mesh	Ammonia
dc.subject.mesh	Nitrous Oxide
dc.subject.mesh	Air Pollutants
dc.subject.mesh	Calibration
dc.subject.mesh	Reproducibility of Results
dc.subject.mesh	Bioreactors
dc.subject.mesh	Sewage
dc.subject.mesh	Water Purification
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Models, Theoretical
dc.subject.mesh	Biodegradation, Environmental
dc.subject.mesh	Wastewater
dc.subject.mesh	Air Pollutants
dc.subject.mesh	Ammonia
dc.subject.mesh	Biodegradation, Environmental
dc.subject.mesh	Bioreactors
dc.subject.mesh	Calibration
dc.subject.mesh	Models, Theoretical
dc.subject.mesh	Nitrous Oxide
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Reproducibility of Results
dc.subject.mesh	Sewage
dc.subject.mesh	Waste Water
dc.subject.mesh	Water Purification
dc.title	Full-Scale Modeling Explaining Large Spatial Variations of Nitrous Oxide Fluxes in a Step-Feed Plug-Flow Wastewater Treatment Reactor.
dc.type	Journal Article
utslib.citation.volume	49
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	2023-03-23T23:01:06Z
pubs.issue	15
pubs.publication-status	Published
pubs.volume	49
utslib.citation.issue	15

Abstract:

Nitrous oxide (N2O) emission data collected from wastewater treatment plants (WWTPs) show huge variations between plants and within one plant (both spatially and temporarily). Such variations and the relative contributions of various N2O production pathways are not fully understood. This study applied a previously established N2O model incorporating two currently known N2O production pathways by ammonia-oxidizing bacteria (AOB) (namely the AOB denitrification and the hydroxylamine pathways) and the N2O production pathway by heterotrophic denitrifiers to describe and provide insights into the large spatial variations of N2O fluxes in a step-feed full-scale activated sludge plant. The model was calibrated and validated by comparing simulation results with 40 days of N2O emission monitoring data as well as other water quality parameters from the plant. The model demonstrated that the relatively high biomass specific nitrogen loading rate in the Second Step of the reactor was responsible for the much higher N2O fluxes from this section. The results further revealed the AOB denitrification pathway decreased and the NH2OH oxidation pathway increased along the path of both Steps due to the increasing dissolved oxygen concentration. The overall N2O emission from this step-feed WWTP would be largely mitigated if 30% of the returned sludge were returned to the Second Step to reduce its biomass nitrogen loading rate.

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http://hdl.handle.net/10453/168270