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Anaerobic arsenite oxidation with an electrode serving as the sole electron acceptor: A novel approach to the bioremediation of arsenic-polluted groundwater

Arsenic contamination of soil and groundwater is a serious problem worldwide. Here we show that anaerobic oxidation of As(III) to As(V), a form which is more extensively and stably adsorbed onto metal-oxides, can be achieved by using a polarized (+497 mV vs. SHE) graphite anode serving as terminal electron acceptor in the microbial metabolism. The characterization of the microbial populations at the electrode, by using in situ detection methods, revealed the predominance of gammaproteobacteria. In principle, the proposed bioelectrochemical oxidation process would make it possible to provide As(III)-oxidizing microorganisms with a virtually unlimited, low-cost and low-maintenance electron acceptor as well as with a physical support for microbial attachment

This work was supported by MIUR PRIN 2010-2011 project (grant agreement No 2010JBNLJ7-002). The authors thank the Advanced Centre for Microscopy "P. Albertano" of University of Rome "Tor Vergata" for CLSM analyses. Narcis Pous and Sebastia Puig were supported by a project grant from the Catalan Government (2012 FI-B 00941) and the Spanish Government (CTQ2011-23632). Narcis Pous was also supported by a COST Action ES1202 in the context of Water 2020 (COST-STSM-ECOST-STSM-ES1202-011013-035423)

Elsevier

Manager: Ministerio de Ciencia e Innovación (Espanya)
Generalitat de Catalunya. Agència de Gestió d’Ajuts Universitaris i de Recerca
Author: Pous Rodríguez, Narcís
Casentini, Barbara
Rossetti, Simona
Fazi, Stefano
Puig Broch, Sebastià
Aulenta, Federico
Abstract: Arsenic contamination of soil and groundwater is a serious problem worldwide. Here we show that anaerobic oxidation of As(III) to As(V), a form which is more extensively and stably adsorbed onto metal-oxides, can be achieved by using a polarized (+497 mV vs. SHE) graphite anode serving as terminal electron acceptor in the microbial metabolism. The characterization of the microbial populations at the electrode, by using in situ detection methods, revealed the predominance of gammaproteobacteria. In principle, the proposed bioelectrochemical oxidation process would make it possible to provide As(III)-oxidizing microorganisms with a virtually unlimited, low-cost and low-maintenance electron acceptor as well as with a physical support for microbial attachment
This work was supported by MIUR PRIN 2010-2011 project (grant agreement No 2010JBNLJ7-002). The authors thank the Advanced Centre for Microscopy "P. Albertano" of University of Rome "Tor Vergata" for CLSM analyses. Narcis Pous and Sebastia Puig were supported by a project grant from the Catalan Government (2012 FI-B 00941) and the Spanish Government (CTQ2011-23632). Narcis Pous was also supported by a COST Action ES1202 in the context of Water 2020 (COST-STSM-ECOST-STSM-ES1202-011013-035423)
Format: application/pdf
Document access: http://hdl.handle.net/10256/11522
Language: eng
Publisher: Elsevier
Collection: info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jhazmat.2014.10.014
info:eu-repo/semantics/altIdentifier/issn/0304-3894
info:eu-repo/semantics/altIdentifier/eissn/1873-3336
info:eu-repo/grantAgreement/MICINN//CTQ2011-23632/ES/SISTEMAS BIOELECTROQUIMICOS PARA EL TRATAMIENTO DE AGUAS: DE LA TRANSFERENCIA ELECTRONICA EXTRACELULAR A LA APLICACION BIOTECNOLOGICA/
AGAUR/2012 FI-B 00941
Rights: Tots els drets reservats
Subject: Bioremediació
Bioremediation
Bioelectroquímica
Bioelectrochemistry
Aigües subterrànies -- Contaminació
Groundwater -- Pollution
Title: Anaerobic arsenite oxidation with an electrode serving as the sole electron acceptor: A novel approach to the bioremediation of arsenic-polluted groundwater
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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