Assessing chromate reduction by dissimilatory iron reducing bacteria using mathematical modeling

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

Assessing chromate reduction by dissimilatory iron reducing bacteria using mathematical modeling

Peng, L Liu, Y

Gao, SH Dai, X Ni, BJ

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Publication Type:: Journal Article
Citation:: Chemosphere, 2015, 139 pp. 334 - 339
Issue Date:: 2015-11-01

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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	Dai, X	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.date.available	2015-06-27	en_US
dc.date.issued	2015-11-01	en_US
dc.identifier.citation	Chemosphere, 2015, 139 pp. 334 - 339	en_US
dc.identifier.issn	0045-6535	en_US
dc.identifier.uri	http://hdl.handle.net/10453/119141
dc.description.abstract	© 2015 Elsevier Ltd. Chromate (Cr (VI)) is a ubiquitous contaminant in aquifers and soils, which can be reduced to its trivalent counterpart (Cr (III)), with the hazard being relieved. The coupling microbial and chemical reduction by dissimilatory iron reducing bacteria (IRB) is a promising approach for the reduction of Cr (VI) to Cr (III). In this work, three mathematical models with different Cr (VI) reduction pathways were proposed and compared based on their ability to predict the performance of an IRB-based stirred-flow reactor treating Cr (VI) contaminated medium and to provide insights into the possible chemical or microbial pathways for Cr (VI) reduction in the system. The Cr (VI) reduction was considered as chemical reaction between Fe (II) and Cr (VI), direct microbial reduction by IRB and combined biotic-abiotic reduction in these three models, respectively. Model evaluation results indicated that the model incorporating both chemical and microbial Cr (VI) reductions could well describe the system performance. In contrast, the other two single-pathway models were not capable of predicting the experimental data, suggesting that both chemical and microbial pathways contributed to Cr (VI) reduction by IRB. The validity of the two-pathway model was further confirmed by an independent experimental data set with different conditions. The results further revealed that the organic carbon availability and Cr (VI) loading rates for the IRB in the system determined the relative contributions of chemical and microbial pathways to overall Cr (VI) reduction.	en_US
dc.relation.ispartof	Chemosphere	en_US
dc.relation.isbasedon	10.1016/j.chemosphere.2015.06.090	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.classification	Meteorology & Atmospheric Sciences	en_US
dc.subject.mesh	Shewanella	en_US
dc.subject.mesh	Chromates	en_US
dc.subject.mesh	Ferric Compounds	en_US
dc.subject.mesh	Ferrous Compounds	en_US
dc.subject.mesh	Environmental Pollutants	en_US
dc.subject.mesh	Oxidation-Reduction	en_US
dc.subject.mesh	Models, Theoretical	en_US
dc.title	Assessing chromate reduction by dissimilatory iron reducing bacteria using mathematical modeling	en_US
dc.type	Journal Article
utslib.citation.volume	139	en_US
utslib.for	090409 Wastewater Treatment Processes	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	139	en_US

Abstract:

© 2015 Elsevier Ltd. Chromate (Cr (VI)) is a ubiquitous contaminant in aquifers and soils, which can be reduced to its trivalent counterpart (Cr (III)), with the hazard being relieved. The coupling microbial and chemical reduction by dissimilatory iron reducing bacteria (IRB) is a promising approach for the reduction of Cr (VI) to Cr (III). In this work, three mathematical models with different Cr (VI) reduction pathways were proposed and compared based on their ability to predict the performance of an IRB-based stirred-flow reactor treating Cr (VI) contaminated medium and to provide insights into the possible chemical or microbial pathways for Cr (VI) reduction in the system. The Cr (VI) reduction was considered as chemical reaction between Fe (II) and Cr (VI), direct microbial reduction by IRB and combined biotic-abiotic reduction in these three models, respectively. Model evaluation results indicated that the model incorporating both chemical and microbial Cr (VI) reductions could well describe the system performance. In contrast, the other two single-pathway models were not capable of predicting the experimental data, suggesting that both chemical and microbial pathways contributed to Cr (VI) reduction by IRB. The validity of the two-pathway model was further confirmed by an independent experimental data set with different conditions. The results further revealed that the organic carbon availability and Cr (VI) loading rates for the IRB in the system determined the relative contributions of chemical and microbial pathways to overall Cr (VI) reduction.

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http://hdl.handle.net/10453/119141