Microbial community composition is unaffected by anode potential

Handle URI:
http://hdl.handle.net/10754/563345
Title:
Microbial community composition is unaffected by anode potential
Authors:
Zhu, Xiuping; Yates, Matthew D.; Hatzell, Marta C.; Rao, Hari Ananda ( 0000-0002-8916-1809 ) ; Saikaly, Pascal ( 0000-0001-7678-3986 ) ; Logan, Bruce E.
Abstract:
There is great controversy on how different set anode potentials affect the performance of a bioelectrochemical system (BES). It is often reported that more positive potentials improve acclimation and performance of exoelectrogenic biofilms, and alter microbial community structure, while in other studies relatively more negative potentials were needed to achieve higher current densities. To address this issue, the biomass, electroactivity, and community structure of anodic biofilms were examined over a wide range of set anode potentials (-0.25, -0.09, 0.21, 0.51, and 0.81 V vs a standard hydrogen electrode, SHE) in single-chamber microbial electrolysis cells. Maximum currents produced using a wastewater inoculum increased with anode potentials in the range of -0.25 to 0.21 V, but decreased at 0.51 and 0.81 V. The maximum currents were positively correlated with increasing biofilm biomass. Pyrosequencing indicated biofilm communities were all similar and dominated by bacteria most similar to Geobacter sulfurreducens. Differences in anode performance with various set potentials suggest that the exoelectrogenic communities self-regulate their exocellular electron transfer pathways to adapt to different anode potentials. © 2013 American Chemical Society.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Environmental Biotechnology Research Group
Publisher:
American Chemical Society (ACS)
Journal:
Environmental Science & Technology
Issue Date:
21-Jan-2014
DOI:
10.1021/es404690q
PubMed ID:
24364567
Type:
Article
ISSN:
0013936X
Sponsors:
This research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST). The authors also want to thank the three anonymous reviewers for their constructive comments on the original manuscript.
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZhu, Xiupingen
dc.contributor.authorYates, Matthew D.en
dc.contributor.authorHatzell, Marta C.en
dc.contributor.authorRao, Hari Anandaen
dc.contributor.authorSaikaly, Pascalen
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2015-08-03T11:46:16Zen
dc.date.available2015-08-03T11:46:16Zen
dc.date.issued2014-01-21en
dc.identifier.issn0013936Xen
dc.identifier.pmid24364567en
dc.identifier.doi10.1021/es404690qen
dc.identifier.urihttp://hdl.handle.net/10754/563345en
dc.description.abstractThere is great controversy on how different set anode potentials affect the performance of a bioelectrochemical system (BES). It is often reported that more positive potentials improve acclimation and performance of exoelectrogenic biofilms, and alter microbial community structure, while in other studies relatively more negative potentials were needed to achieve higher current densities. To address this issue, the biomass, electroactivity, and community structure of anodic biofilms were examined over a wide range of set anode potentials (-0.25, -0.09, 0.21, 0.51, and 0.81 V vs a standard hydrogen electrode, SHE) in single-chamber microbial electrolysis cells. Maximum currents produced using a wastewater inoculum increased with anode potentials in the range of -0.25 to 0.21 V, but decreased at 0.51 and 0.81 V. The maximum currents were positively correlated with increasing biofilm biomass. Pyrosequencing indicated biofilm communities were all similar and dominated by bacteria most similar to Geobacter sulfurreducens. Differences in anode performance with various set potentials suggest that the exoelectrogenic communities self-regulate their exocellular electron transfer pathways to adapt to different anode potentials. © 2013 American Chemical Society.en
dc.description.sponsorshipThis research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST). The authors also want to thank the three anonymous reviewers for their constructive comments on the original manuscript.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleMicrobial community composition is unaffected by anode potentialen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentEnvironmental Biotechnology Research Groupen
dc.identifier.journalEnvironmental Science & Technologyen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, United Statesen
kaust.authorSaikaly, Pascalen
kaust.authorRao, Hari Anandaen

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