Cathode potential and anode electron donor evaluation for a suitable treatment of nitrate-contaminated groundwater in bioelectrochemical systems
dc.contributor.author
dc.date.accessioned
2015-08-03T07:45:15Z
dc.date.available
2017-03-02T04:00:05Z
dc.date.issued
2015-03
dc.identifier.issn
1385-8947
dc.identifier.uri
dc.description.abstract
Several regions around the world present high levels of nitrate in groundwater. Due to its toxicity, nitrate must be removed before the groundwater is used as drinking-water. This study assessed how a denitrifying bioelectrochemical system could be operated to treat nitrate-polluted groundwater. It evaluated the cathode potential (from +597 to -703mV vs SHE) and the anode electron donor (acetate and water). Similar trends were found regardless of the anode electron donor. The nitrate removal rate increased from 1.05 to 5.44mgN-NO3 -LNCC -1h-1 when the cathode potential was lowered from +597 to -403mV vs SHE, where it stabilized. The nitrate reduction end-products (nitrite, nitrous oxide and dinitrogen gas) also changed with the different potentials of the cathode electrode. The World Health Organization nitrates and nitrites standards for drinking-water were reached at cathode potentials between -103 and -203mV vs SHE. The highest rate of nitrate conversion to N2 (2.59mgN-NO3 -LNCC -1h-1, 93.9%) occurred at -123mV using water as anode electron donor, with an estimated operational cost similar to conventional technologies (0.68·10-2kWhgN-NO3-removed-1). The long-term stability of proposed operation was demonstrated during 96days, and the rate of nitrate conversion to N2 even increased to 4.09mgN-NO3 -LNCC -1h-1. A carbon-free operation for a bioelectrochemical system has been developed to treat nitrate-polluted groundwater at a competitive cost
dc.description.sponsorship
This research was financially supported by the Spanish Government (CTQ2011-23632, CONSOLIDERCSD2007-00055) and the Catalan Government (2014-SGR-1168). Narcis Pous was supported by a project grant from the Catalan Government (2012 FI-B 00941)
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.relation
info:eu-repo/grantAgreement/MICINN//CTQ2011-23632/ES/SISTEMAS BIOELECTROQUIMICOS PARA EL TRATAMIENTO DE AGUAS: DE LA TRANSFERENCIA ELECTRONICA EXTRACELULAR A LA APLICACION BIOTECNOLOGICA/
info:eu-repo/grantAgreement/MEC//CSD2007-00055/ES/Concepción de la EDAR del siglo XXI. Desarrollo, implementación y evaluación de tecnologías para el tratamiento y recuperación de recursos en aguas residuales/
AGAUR/2014-2016/2014 SGR 1168
AGAUR/2012 FI-B 00941
dc.relation.isformatof
Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.cej.2014.11.002
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© Chemical Engineering Journal, 2015, vol. 263, p. 151-159
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Articles publicats (D-EQATA)
dc.rights
Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
dc.rights.uri
dc.subject
dc.title
Cathode potential and anode electron donor evaluation for a suitable treatment of nitrate-contaminated groundwater in bioelectrochemical systems
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/openAccess
dc.type.version
info:eu-repo/semantics/acceptedVersion
dc.identifier.doi
dc.identifier.idgrec
022032
dc.contributor.funder
dc.relation.ProjectAcronym