Item


Cathode potential and anode electron donor evaluation for a suitable treatment of nitrate-contaminated groundwater in bioelectrochemical systems

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

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)

© Chemical Engineering Journal, 2015, vol. 263, p. 151-159

Elsevier

Author: Pous Rodríguez, Narcís
Puig Broch, Sebastià
Balaguer i Condom, Maria Dolors
Colprim Galceran, Jesús
Date: 2015 March
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
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)
Format: application/pdf
ISSN: 1385-8947
Document access: http://hdl.handle.net/10256/10826
Language: eng
Publisher: Elsevier
Collection: MICINN/PN 2012-2014/CTQ2011-23632
MEC/PN 2007-2013/CSD2007-00055
AGAUR/2014-2016/2014 SGR 1168
AGAUR/2012 FI-B 00941
Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.cej.2014.11.002
Articles publicats (D-EQATA)
Is part of: © Chemical Engineering Journal, 2015, vol. 263, p. 151-159
Rights: Tots els drets reservats
Subject: Bioremediació
Bioremediation
Desnitrificació
Denitrification
Biotecnologia microbiana
Microbial biotechnology
Nitrogen
Title: Cathode potential and anode electron donor evaluation for a suitable treatment of nitrate-contaminated groundwater in bioelectrochemical systems
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

Subjects

Authors