Syntrophic interactions improve power production in formic acid fed MFCs operated with set anode potentials or fixed resistances

Handle URI:
http://hdl.handle.net/10754/599611
Title:
Syntrophic interactions improve power production in formic acid fed MFCs operated with set anode potentials or fixed resistances
Authors:
Sun, Dan; Call, Douglas F.; Kiely, Patrick D.; Wang, Aijie; Logan, Bruce E.
Abstract:
Formic acid is a highly energetic electron donor but it has previously resulted in low power densities in microbial fuel cells (MFCs). Three different set anode potentials (-0.30, -0.15, and +0.15V; vs. a standard hydrogen electrode, SHE) were used to evaluate syntrophic interactions in bacterial communities for formic acid degradation relative to a non-controlled, high resistance system (1,000Ω external resistance). No current was generated at -0.30V, suggesting a lack of direct formic acid oxidation (standard reduction potential: -0.40V). More positive potentials that allowed for acetic acid utilization all produced current, with the best performance at -0.15V. The anode community in the -0.15V reactor, based on 16S rDNA clone libraries, was 58% Geobacter sulfurreducens and 17% Acetobacterium, with lower proportions of these genera found in the other two MFCs. Acetic acid was detected in all MFCs suggesting that current generation by G. sulfurreducens was dependent on acetic acid production by Acetobacterium. When all MFCs were subsequently operated at an external resistance for maximum power production (100Ω for MFCs originally set at -0.15 and +0.15V; 150Ω for the control), they produced similar power densities and exhibited the same midpoint potential of -0.15V in first derivative cyclic voltammetry scans. All of the mixed communities converged to similar proportions of the two predominant genera (ca. 52% G. sulfurreducens and 22% Acetobacterium). These results show that syntrophic interactions can be enhanced through setting certain anode potentials, and that long-term performance produces stable and convergent communities. © 2011 Wiley Periodicals, Inc.
Citation:
Sun D, Call DF, Kiely PD, Wang A, Logan BE (2011) Syntrophic interactions improve power production in formic acid fed MFCs operated with set anode potentials or fixed resistances. Biotechnology and Bioengineering 109: 405–414. Available: http://dx.doi.org/10.1002/bit.23348.
Publisher:
Wiley-Blackwell
Journal:
Biotechnology and Bioengineering
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
24-Oct-2011
DOI:
10.1002/bit.23348
PubMed ID:
22006545
Type:
Article
ISSN:
0006-3592
Sponsors:
Contract grant sponsor: King Abdullah University of Science and Technology (KAUST)Contract grant number: KUS-I1-003-13Contract grant sponsor: National Science Foundation Graduate Research FellowshipContract grant sponsor: China Scholarship Council (CSC)
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorSun, Danen
dc.contributor.authorCall, Douglas F.en
dc.contributor.authorKiely, Patrick D.en
dc.contributor.authorWang, Aijieen
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-28T06:30:51Zen
dc.date.available2016-02-28T06:30:51Zen
dc.date.issued2011-10-24en
dc.identifier.citationSun D, Call DF, Kiely PD, Wang A, Logan BE (2011) Syntrophic interactions improve power production in formic acid fed MFCs operated with set anode potentials or fixed resistances. Biotechnology and Bioengineering 109: 405–414. Available: http://dx.doi.org/10.1002/bit.23348.en
dc.identifier.issn0006-3592en
dc.identifier.pmid22006545en
dc.identifier.doi10.1002/bit.23348en
dc.identifier.urihttp://hdl.handle.net/10754/599611en
dc.description.abstractFormic acid is a highly energetic electron donor but it has previously resulted in low power densities in microbial fuel cells (MFCs). Three different set anode potentials (-0.30, -0.15, and +0.15V; vs. a standard hydrogen electrode, SHE) were used to evaluate syntrophic interactions in bacterial communities for formic acid degradation relative to a non-controlled, high resistance system (1,000Ω external resistance). No current was generated at -0.30V, suggesting a lack of direct formic acid oxidation (standard reduction potential: -0.40V). More positive potentials that allowed for acetic acid utilization all produced current, with the best performance at -0.15V. The anode community in the -0.15V reactor, based on 16S rDNA clone libraries, was 58% Geobacter sulfurreducens and 17% Acetobacterium, with lower proportions of these genera found in the other two MFCs. Acetic acid was detected in all MFCs suggesting that current generation by G. sulfurreducens was dependent on acetic acid production by Acetobacterium. When all MFCs were subsequently operated at an external resistance for maximum power production (100Ω for MFCs originally set at -0.15 and +0.15V; 150Ω for the control), they produced similar power densities and exhibited the same midpoint potential of -0.15V in first derivative cyclic voltammetry scans. All of the mixed communities converged to similar proportions of the two predominant genera (ca. 52% G. sulfurreducens and 22% Acetobacterium). These results show that syntrophic interactions can be enhanced through setting certain anode potentials, and that long-term performance produces stable and convergent communities. © 2011 Wiley Periodicals, Inc.en
dc.description.sponsorshipContract grant sponsor: King Abdullah University of Science and Technology (KAUST)Contract grant number: KUS-I1-003-13Contract grant sponsor: National Science Foundation Graduate Research FellowshipContract grant sponsor: China Scholarship Council (CSC)en
dc.publisherWiley-Blackwellen
dc.subjectAcetobacteriumen
dc.subjectFormic aciden
dc.subjectGeobacteren
dc.subjectMicrobial fuel cellen
dc.subjectSyntrophic interactionsen
dc.titleSyntrophic interactions improve power production in formic acid fed MFCs operated with set anode potentials or fixed resistancesen
dc.typeArticleen
dc.identifier.journalBiotechnology and Bioengineeringen
dc.contributor.institutionHarbin Institute of Technology, Harbin, Chinaen
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.