Evaluation of nitrous oxide emission from sulfide- and sulfur-based autotrophic denitrification processes

Liu, Y; Peng, L; Ngo, HH; Guo, W; Wang, D; Pan, Y; Sun, J; Ni, BJ

Evaluation of nitrous oxide emission from sulfide- and sulfur-based autotrophic denitrification processes

Liu, Y

Peng, L Ngo, HH

Guo, W

Wang, D Pan, Y Sun, J Ni, BJ

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Publication Type:: Journal Article
Citation:: Environmental Science and Technology, 2016, 50 (17), pp. 9407 - 9415
Issue Date:: 2016-09-06

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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	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	Wang, D	en_US
dc.contributor.author	Pan, Y	en_US
dc.contributor.author	Sun, J	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.date.issued	2016-09-06	en_US
dc.identifier.citation	Environmental Science and Technology, 2016, 50 (17), pp. 9407 - 9415	en_US
dc.identifier.issn	0013-936X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/59024
dc.description.abstract	© 2016 American Chemical Society. Recent studies have shown that sulfide- and sulfur-based autotrophic denitrification (AD) processes play an important role in contributing to nitrous oxide (N2O) production and emissions. However, N2O production is not recognized in the current AD models, limiting their ability to predict N2O accumulation during AD. In this work, a mathematical model is developed to describe N2O dynamics during sulfide- and sulfur-based AD processes for the first time. The model is successfully calibrated and validated using N2O data from two independent experimental systems with sulfide or sulfur as electron donors for AD. The model satisfactorily describes nitrogen reductions, sulfide/sulfur oxidation, and N2O accumulation in both systems. Modeling results revealed substantial N2O accumulation due to the relatively low N2O reduction rate during both sulfide- and sulfur-based AD processes. Application of the model to simulate long-term operations of activated sludge systems performing sulfide- and sulfur-based AD processes indicates longer sludge retention time reduced N2O emission. For sulfide-based AD process, higher initial S/N ratio also decreased N2O emission but with a higher operational cost. This model can be a useful tool to support process operation optimization for N2O mitigation during AD with sulfide or sulfur as electron donor.	en_US
dc.relation.ispartof	Environmental Science and Technology	en_US
dc.relation.isbasedon	10.1021/acs.est.6b02202	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.mesh	Sulfides	en_US
dc.subject.mesh	Sulfur	en_US
dc.subject.mesh	Nitrous Oxide	en_US
dc.subject.mesh	Bioreactors	en_US
dc.subject.mesh	Autotrophic Processes	en_US
dc.subject.mesh	Denitrification	en_US
dc.title	Evaluation of nitrous oxide emission from sulfide- and sulfur-based autotrophic denitrification processes	en_US
dc.type	Journal Article
utslib.citation.volume	17	en_US
utslib.citation.volume	50	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	closed_access
pubs.issue	17	en_US
pubs.publication-status	Published	en_US
pubs.volume	50	en_US

Abstract:

© 2016 American Chemical Society. Recent studies have shown that sulfide- and sulfur-based autotrophic denitrification (AD) processes play an important role in contributing to nitrous oxide (N2O) production and emissions. However, N2O production is not recognized in the current AD models, limiting their ability to predict N2O accumulation during AD. In this work, a mathematical model is developed to describe N2O dynamics during sulfide- and sulfur-based AD processes for the first time. The model is successfully calibrated and validated using N2O data from two independent experimental systems with sulfide or sulfur as electron donors for AD. The model satisfactorily describes nitrogen reductions, sulfide/sulfur oxidation, and N2O accumulation in both systems. Modeling results revealed substantial N2O accumulation due to the relatively low N2O reduction rate during both sulfide- and sulfur-based AD processes. Application of the model to simulate long-term operations of activated sludge systems performing sulfide- and sulfur-based AD processes indicates longer sludge retention time reduced N2O emission. For sulfide-based AD process, higher initial S/N ratio also decreased N2O emission but with a higher operational cost. This model can be a useful tool to support process operation optimization for N2O mitigation during AD with sulfide or sulfur as electron donor.

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

http://hdl.handle.net/10453/59024