Modeling effects of H<inf>2</inf>S on electron competition among nitrogen oxide reduction and N<inf>2</inf>O accumulation during denitrification

Pan, Y; Liu, Y; Wang, D; Ni, BJ

Modeling effects of H<inf>2</inf>S on electron competition among nitrogen oxide reduction and N<inf>2</inf>O accumulation during denitrification

Pan, Y Liu, Y

Wang, D Ni, BJ

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Publication Type:: Journal Article
Citation:: Environmental Science: Water Research and Technology, 2019, 5 (3), pp. 533 - 542
Issue Date:: 2019-03-01

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Field	Value	Language
dc.contributor.author	Pan, Y	en_US
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961	en_US
dc.contributor.author	Wang, D	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.date.issued	2019-03-01	en_US
dc.identifier.citation	Environmental Science: Water Research and Technology, 2019, 5 (3), pp. 533 - 542	en_US
dc.identifier.issn	2053-1400	en_US
dc.identifier.uri	http://hdl.handle.net/10453/138696
dc.description.abstract	© 2019 The Royal Society of Chemistry. Nitrous oxide (N2O) accumulation during heterotrophic denitrification can be severely affected by hydrogen sulfide (H2S) that is generated from sewer networks and introduced to the denitrification system. In this study, a new mathematical model was developed to assess nitrogen oxide dynamics during heterotrophic denitrification in the presence of different H2S concentrations. The model describes electron competition during three-step denitrification (i.e., nitrate to nitrite, nitrite to N2O, and N2O and nitrogen gas) through linking nitrogen reduction and carbon oxidation processes with a pool of electron carriers and considering a non-competitive H2S inhibition function on nitrite and N2O reduction kinetics. The developed model well reproduced experimental nitrogen oxide data caused by the H2S inhibition on denitrification with methanol-utilizing denitrifying cultures under different operational scenarios, indicating model validity and applicability. Modeling results revealed that N2O accumulation could be increased with elevated H2S levels, due to the decreased electron competition capacity of N2O reduction compared to that of nitrate and nitrite reduction. Increasing electrons were distributed to nitrate and nitrite reduction due to their higher tolerance to H2S. Less N2O accumulation can be achieved by extending the feeding period of H2S.	en_US
dc.relation	http://purl.org/au-research/grants/arc/FT160100195
dc.relation.ispartof	Environmental Science: Water Research and Technology	en_US
dc.relation.isbasedon	10.1039/c8ew00873f	en_US
dc.title	Modeling effects of H<inf>2</inf>S on electron competition among nitrogen oxide reduction and N<inf>2</inf>O accumulation during denitrification	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	5	en_US
utslib.for	0399 Other Chemical Sciences	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0907 Environmental 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	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	5	en_US

Abstract:

© 2019 The Royal Society of Chemistry. Nitrous oxide (N2O) accumulation during heterotrophic denitrification can be severely affected by hydrogen sulfide (H2S) that is generated from sewer networks and introduced to the denitrification system. In this study, a new mathematical model was developed to assess nitrogen oxide dynamics during heterotrophic denitrification in the presence of different H2S concentrations. The model describes electron competition during three-step denitrification (i.e., nitrate to nitrite, nitrite to N2O, and N2O and nitrogen gas) through linking nitrogen reduction and carbon oxidation processes with a pool of electron carriers and considering a non-competitive H2S inhibition function on nitrite and N2O reduction kinetics. The developed model well reproduced experimental nitrogen oxide data caused by the H2S inhibition on denitrification with methanol-utilizing denitrifying cultures under different operational scenarios, indicating model validity and applicability. Modeling results revealed that N2O accumulation could be increased with elevated H2S levels, due to the decreased electron competition capacity of N2O reduction compared to that of nitrate and nitrite reduction. Increasing electrons were distributed to nitrate and nitrite reduction due to their higher tolerance to H2S. Less N2O accumulation can be achieved by extending the feeding period of H2S.

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http://hdl.handle.net/10453/138696