Evaluating simultaneous chromate and nitrate reduction during microbial denitrification processes

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

Evaluating simultaneous chromate and nitrate reduction during microbial denitrification processes

Peng, L Liu, Y

Gao, SH Chen, X Ni, BJ

Permalink

Publication Type:: Journal Article
Citation:: Water Research, 2016, 89 pp. 1 - 8
Issue Date:: 2016-02-01

Closed Access

	Filename	Description	Size
	1-s2.0-S0043135415303584-main.pdf	Published Version	869.82 kB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Peng, L	en_US
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961	en_US
dc.contributor.author	Gao, SH	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.available	2015-11-13	en_US
dc.date.issued	2016-02-01	en_US
dc.identifier.citation	Water Research, 2016, 89 pp. 1 - 8	en_US
dc.identifier.issn	0043-1354	en_US
dc.identifier.uri	http://hdl.handle.net/10453/119146
dc.description.abstract	© 2015 Elsevier Ltd. Sulfur-based autotrophic denitrification and heterotrophic denitrification have been demonstrated to be promising technological processes for simultaneous removal of nitrate (NO3-) and chromate (Cr (VI)), two common contaminants in surface and ground waters. In this work, a mathematical model was developed to describe and evaluate the microbial and substrate interactions among sulfur oxidizing denitrifying organism, methanol-based heterotrophic denitrifiers and chromate reducing bacteria in the biofilm systems for simultaneous nitrate and chromate removal. The concomitant multiple chromate reduction pathways by these microbes were taken into account in this model. The validity of the model was tested using experimental data from three independent biofilm reactors under autotrophic, heterotrophic and mixotrophic conditions. The model sufficiently described the nitrate, chromate, methanol, and sulfate dynamics under varying conditions. The modeling results demonstrated the coexistence of sulfur-oxidizing denitrifying bacteria and heterotrophic denitrifying bacteria in the biofilm under mixotrophic conditions, with chromate reducing bacteria being outcompeted. The sulfur-oxidizing denitrifying bacteria substantially contributed to both nitrate and chromate reductions although heterotrophic denitrifying bacteria dominated in the biofilm. The mixotrophic denitrification could improve the tolerance of autotrophic denitrifying bacteria to Cr (VI) toxicity. Furthermore, HRT would play an important role in affecting the microbial distribution and system performance, with HRT of higher than 0.15 day being critical for a high level removal of nitrate and chromate (over 90%).	en_US
dc.relation.ispartof	Water Research	en_US
dc.relation.isbasedon	10.1016/j.watres.2015.11.031	en_US
dc.subject.classification	Environmental Engineering	en_US
dc.subject.mesh	Bacteria	en_US
dc.subject.mesh	Chromates	en_US
dc.subject.mesh	Nitrates	en_US
dc.subject.mesh	Sulfates	en_US
dc.subject.mesh	Water Pollutants, Chemical	en_US
dc.subject.mesh	Bioreactors	en_US
dc.subject.mesh	Water Purification	en_US
dc.subject.mesh	Models, Theoretical	en_US
dc.subject.mesh	Heterotrophic Processes	en_US
dc.subject.mesh	Autotrophic Processes	en_US
dc.subject.mesh	Denitrification	en_US
dc.title	Evaluating simultaneous chromate and nitrate reduction during microbial denitrification processes	en_US
dc.type	Journal Article
utslib.citation.volume	89	en_US
utslib.for	090404 Membrane and Separation Technologies	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.publication-status	Published	en_US
pubs.volume	89	en_US

Abstract:

© 2015 Elsevier Ltd. Sulfur-based autotrophic denitrification and heterotrophic denitrification have been demonstrated to be promising technological processes for simultaneous removal of nitrate (NO3-) and chromate (Cr (VI)), two common contaminants in surface and ground waters. In this work, a mathematical model was developed to describe and evaluate the microbial and substrate interactions among sulfur oxidizing denitrifying organism, methanol-based heterotrophic denitrifiers and chromate reducing bacteria in the biofilm systems for simultaneous nitrate and chromate removal. The concomitant multiple chromate reduction pathways by these microbes were taken into account in this model. The validity of the model was tested using experimental data from three independent biofilm reactors under autotrophic, heterotrophic and mixotrophic conditions. The model sufficiently described the nitrate, chromate, methanol, and sulfate dynamics under varying conditions. The modeling results demonstrated the coexistence of sulfur-oxidizing denitrifying bacteria and heterotrophic denitrifying bacteria in the biofilm under mixotrophic conditions, with chromate reducing bacteria being outcompeted. The sulfur-oxidizing denitrifying bacteria substantially contributed to both nitrate and chromate reductions although heterotrophic denitrifying bacteria dominated in the biofilm. The mixotrophic denitrification could improve the tolerance of autotrophic denitrifying bacteria to Cr (VI) toxicity. Furthermore, HRT would play an important role in affecting the microbial distribution and system performance, with HRT of higher than 0.15 day being critical for a high level removal of nitrate and chromate (over 90%).

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

http://hdl.handle.net/10453/119146