Enhanced nitrogen removal in single-chamber microbial fuel cells with increased gas diffusion areas

Handle URI:
http://hdl.handle.net/10754/598183
Title:
Enhanced nitrogen removal in single-chamber microbial fuel cells with increased gas diffusion areas
Authors:
Yan, Hengjing; Regan, John M.
Abstract:
Single-chamber microbial fuel cells (MFCs) with nitrifiers pre-enriched at the air cathodes have previously been demonstrated as a passive strategy for integrating nitrogen removal into current-generating bioelectrochemical systems. To further define system design parameters for this strategy, we investigated in this study the effects of oxygen diffusion area and COD/N ratio in continuous-flow reactors. Doubling the gas diffusion area by adding an additional air cathode or a diffusion cloth significantly increased the ammonia and COD removal rates (by up to 115% and 39%), ammonia removal efficiency (by up to 134%), the cell voltage and cathode potentials, and the power densities (by a factor of approximately 2). When the COD/N ratio was lowered from 13 to 3, we found up to 244% higher ammonia removal rate but at least 19% lower ammonia removal efficiency. An increase of COD removal rate by up to 27% was also found when the COD/N ratio was lowered from 11 to 3. The Coulombic efficiency was not affected by the additional air cathode, but decreased by an average of 11% with the addition of a diffusion cloth. Ammonia removal by assimilation was also estimated to understand the ammonia removal mechanism in these systems. These results showed that the doubling of gas diffusion area enhanced N and COD removal rates without compromising electrochemical performance. © 2012 Wiley Periodicals, Inc.
Citation:
Yan H, Regan JM (2012) Enhanced nitrogen removal in single-chamber microbial fuel cells with increased gas diffusion areas. Biotechnology and Bioengineering 110: 785–791. Available: http://dx.doi.org/10.1002/bit.24769.
Publisher:
Wiley-Blackwell
Journal:
Biotechnology and Bioengineering
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
23-Nov-2012
DOI:
10.1002/bit.24769
PubMed ID:
23097182
Type:
Article
ISSN:
0006-3592
Sponsors:
Contract grant sponsor: King Abdullah University of Science and Technology (KAUST)Contract grant number: KUS-I1-003-13
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorYan, Hengjingen
dc.contributor.authorRegan, John M.en
dc.date.accessioned2016-02-25T13:14:16Zen
dc.date.available2016-02-25T13:14:16Zen
dc.date.issued2012-11-23en
dc.identifier.citationYan H, Regan JM (2012) Enhanced nitrogen removal in single-chamber microbial fuel cells with increased gas diffusion areas. Biotechnology and Bioengineering 110: 785–791. Available: http://dx.doi.org/10.1002/bit.24769.en
dc.identifier.issn0006-3592en
dc.identifier.pmid23097182en
dc.identifier.doi10.1002/bit.24769en
dc.identifier.urihttp://hdl.handle.net/10754/598183en
dc.description.abstractSingle-chamber microbial fuel cells (MFCs) with nitrifiers pre-enriched at the air cathodes have previously been demonstrated as a passive strategy for integrating nitrogen removal into current-generating bioelectrochemical systems. To further define system design parameters for this strategy, we investigated in this study the effects of oxygen diffusion area and COD/N ratio in continuous-flow reactors. Doubling the gas diffusion area by adding an additional air cathode or a diffusion cloth significantly increased the ammonia and COD removal rates (by up to 115% and 39%), ammonia removal efficiency (by up to 134%), the cell voltage and cathode potentials, and the power densities (by a factor of approximately 2). When the COD/N ratio was lowered from 13 to 3, we found up to 244% higher ammonia removal rate but at least 19% lower ammonia removal efficiency. An increase of COD removal rate by up to 27% was also found when the COD/N ratio was lowered from 11 to 3. The Coulombic efficiency was not affected by the additional air cathode, but decreased by an average of 11% with the addition of a diffusion cloth. Ammonia removal by assimilation was also estimated to understand the ammonia removal mechanism in these systems. These results showed that the doubling of gas diffusion area enhanced N and COD removal rates without compromising electrochemical performance. © 2012 Wiley Periodicals, Inc.en
dc.description.sponsorshipContract grant sponsor: King Abdullah University of Science and Technology (KAUST)Contract grant number: KUS-I1-003-13en
dc.publisherWiley-Blackwellen
dc.subjectAmmonia removalen
dc.subjectCOD/N ratioen
dc.subjectMicrobial fuel cellsen
dc.subjectOxygen diffusionen
dc.titleEnhanced nitrogen removal in single-chamber microbial fuel cells with increased gas diffusion areasen
dc.typeArticleen
dc.identifier.journalBiotechnology and Bioengineeringen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.