Kinetic assessment of simultaneous removal of arsenite, chlorate and nitrate under autotrophic and mixotrophic conditions

Peng, L; Dai, X; Liu, Y; Wei, W; Sun, J; Xie, GJ; Wang, D; Song, S; Ni, BJ

Kinetic assessment of simultaneous removal of arsenite, chlorate and nitrate under autotrophic and mixotrophic conditions

Peng, L Dai, X Liu, Y

Wei, W Sun, J Xie, GJ Wang, D Song, S Ni, BJ

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Publication Type:: Journal Article
Citation:: Science of the Total Environment, 2018, 628-629 pp. 85 - 93
Issue Date:: 2018-07-01

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Field	Value	Language
dc.contributor.author	Peng, L	en_US
dc.contributor.author	Dai, X	en_US
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961	en_US
dc.contributor.author	Wei, W	en_US
dc.contributor.author	Sun, J	en_US
dc.contributor.author	Xie, GJ	en_US
dc.contributor.author	Wang, D	en_US
dc.contributor.author	Song, S	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.date.available	2018-02-03	en_US
dc.date.issued	2018-07-01	en_US
dc.identifier.citation	Science of the Total Environment, 2018, 628-629 pp. 85 - 93	en_US
dc.identifier.issn	0048-9697	en_US
dc.identifier.uri	http://hdl.handle.net/10453/134288
dc.description.abstract	© 2018 In this work, a kinetic model was proposed to evaluate the simultaneous removal of arsenite (As (III)), chlorate (ClO3−) and nitrate (NO3−) in a granule-based mixotrophic As (III) oxidizing bioreactor for the first time. The autotrophic kinetics related to growth-linked As (III) oxidation and ClO3− reduction by As (III) oxidizing bacteria (AsOB) were calibrated and validated based on experimental data from batch test and long-term reactor operation under autotrophic conditions. The heterotrophic kinetics related to non-growth linked As (III) oxidation and ClO3− reduction by heterotrophic bacteria (HB) were evaluated based on the batch experimental data under heterotrophic conditions. The existing kinetics related to As (III) oxidation with NO3− as the electron acceptor together with heterotrophic denitrification were incorporated into the model framework to assess the bioreactor performance in treatment of the three co-occurring contaminants. The results revealed that under autotrophic conditions As (III) was completely oxidized by AsOB (over 99%), while ClO3− and NO3− were poorly removed. Under mixotrophic conditions, the simultaneous removal of the three contaminants was achieved with As (III) oxidized mostly by AsOB and ClO3− and NO3− removed mostly by HB. Both hydraulic retention time (HRT) and influent organic matter (COD) concentration significantly affected the removal efficiency. Above 90% of As (III), ClO3− and NO3− were removed in the mixotrophic bioreactor under optimal operational conditions of HRT and influent COD.	en_US
dc.relation.ispartof	Science of the Total Environment	en_US
dc.relation.isbasedon	10.1016/j.scitotenv.2018.02.034	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.mesh	Arsenites	en_US
dc.subject.mesh	Chlorates	en_US
dc.subject.mesh	Nitrates	en_US
dc.subject.mesh	Bioreactors	en_US
dc.subject.mesh	Waste Disposal, Fluid	en_US
dc.subject.mesh	Kinetics	en_US
dc.subject.mesh	Autotrophic Processes	en_US
dc.subject.mesh	Denitrification	en_US
dc.title	Kinetic assessment of simultaneous removal of arsenite, chlorate and nitrate under autotrophic and mixotrophic conditions	en_US
dc.type	Journal Article
utslib.citation.volume	628-629	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.publication-status	Published	en_US
pubs.volume	628-629	en_US

Abstract:

© 2018 In this work, a kinetic model was proposed to evaluate the simultaneous removal of arsenite (As (III)), chlorate (ClO3−) and nitrate (NO3−) in a granule-based mixotrophic As (III) oxidizing bioreactor for the first time. The autotrophic kinetics related to growth-linked As (III) oxidation and ClO3− reduction by As (III) oxidizing bacteria (AsOB) were calibrated and validated based on experimental data from batch test and long-term reactor operation under autotrophic conditions. The heterotrophic kinetics related to non-growth linked As (III) oxidation and ClO3− reduction by heterotrophic bacteria (HB) were evaluated based on the batch experimental data under heterotrophic conditions. The existing kinetics related to As (III) oxidation with NO3− as the electron acceptor together with heterotrophic denitrification were incorporated into the model framework to assess the bioreactor performance in treatment of the three co-occurring contaminants. The results revealed that under autotrophic conditions As (III) was completely oxidized by AsOB (over 99%), while ClO3− and NO3− were poorly removed. Under mixotrophic conditions, the simultaneous removal of the three contaminants was achieved with As (III) oxidized mostly by AsOB and ClO3− and NO3− removed mostly by HB. Both hydraulic retention time (HRT) and influent organic matter (COD) concentration significantly affected the removal efficiency. Above 90% of As (III), ClO3− and NO3− were removed in the mixotrophic bioreactor under optimal operational conditions of HRT and influent COD.

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http://hdl.handle.net/10453/134288