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dc.contributor.authorRao, Hari Ananda
dc.contributor.authorVenkidusamy, Krishnaveni
dc.contributor.authorKaturi, Krishna
dc.contributor.authorBagchi, Samik
dc.contributor.authorSaikaly, Pascal
dc.date.accessioned2017-08-03T11:56:25Z
dc.date.available2017-08-03T11:56:25Z
dc.date.issued2017-07-20
dc.identifier.citationHari AR, Venkidusamy K, Katuri KP, Bagchi S, Saikaly PE (2017) Temporal Microbial Community Dynamics in Microbial Electrolysis Cells – Influence of Acetate and Propionate Concentration. Frontiers in Microbiology 8. Available: http://dx.doi.org/10.3389/fmicb.2017.01371.
dc.identifier.issn1664-302X
dc.identifier.pmid28775719
dc.identifier.doi10.3389/fmicb.2017.01371
dc.identifier.urihttp://hdl.handle.net/10754/625289
dc.description.abstractMicrobial electrolysis cells (MECs) are widely considered as a next generation wastewater treatment system. However, fundamental insight on the temporal dynamics of microbial communities associated with MEC performance under different organic types with varied loading concentrations is still unknown, nevertheless this knowledge is essential for optimizing this technology for real-scale applications. Here, the temporal dynamics of anodic microbial communities associated with MEC performance was examined at low (0.5 g COD/L) and high (4 g COD/L) concentrations of acetate or propionate, which are important intermediates of fermentation of municipal wastewaters and sludge. The results showed that acetate-fed reactors exhibited higher performance in terms of maximum current density (I: 4.25 ± 0.23 A/m), coulombic efficiency (CE: 95 ± 8%), and substrate degradation rate (98.8 ± 1.2%) than propionate-fed reactors (I: 2.7 ± 0.28 A/m; CE: 68 ± 9.5%; substrate degradation rate: 84 ± 13%) irrespective of the concentrations tested. Despite of the repeated sampling of the anodic biofilm over time, the high-concentration reactors demonstrated lower and stable performance in terms of current density (I: 1.1 ± 0.14 to 4.2 ± 0.21 A/m), coulombic efficiency (CE: 44 ± 4.1 to 103 ± 7.2%) and substrate degradation rate (64.9 ± 6.3 to 99.7 ± 0.5%), while the low-concentration reactors produced higher and dynamic performance (I: 1.1 ± 0.12 to 4.6 ± 0.1 A/m; CE: 52 ± 2.5 to 105 ± 2.7%; substrate degradation rate: 87.2 ± 0.2 to 99.9 ± 0.06%) with the different substrates tested. Correlating reactor's performance with temporal dynamics of microbial communities showed that relatively similar anodic microbial community composition but with varying relative abundances was observed in all the reactors despite differences in the substrate and concentrations tested. Particularly, Geobacter was the predominant bacteria on the anode biofilm of all MECs over time suggesting its possible role in maintaining functional stability of MECs fed with low and high concentrations of acetate and propionate. Taken together, these results provide new insights on the microbial community dynamics and its correlation to performance in MECs fed with different concentrations of acetate and propionate, which are important volatile fatty acids in wastewater.
dc.description.sponsorshipThis work was sponsored by a Ph.D. fellowship, a Global Research Partnership-Collaborative Fellows Award (GRP-CF-2011-15-S) and Center Competitive Funding (FCC/1/1971–05–01) to PS from King Abdullah University of Science and Technology (KAUST). The authors thank Prof. Bruce E. Logan, Pennsylvania State University, United States for comments and suggestions on previous versions of this manuscript.
dc.publisherFrontiers Media SA
dc.relation.urlhttp://journal.frontiersin.org/article/10.3389/fmicb.2017.01371/full
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectAcetate
dc.subjectGeobacter
dc.subjectMicrobial community dynamics
dc.subjectMicrobial electrolysis cells
dc.subjectPropionate
dc.titleTemporal Microbial Community Dynamics in Microbial Electrolysis Cells – Influence of Acetate and Propionate Concentration
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalFrontiers in Microbiology
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionCentre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, SA, , Australia
dc.contributor.institutionDepartment of Civil, Environmental and Architectural Engineering, University of Kansas, Lawrence, KS, , United States
kaust.personRao, Hari Ananda
kaust.personKaturi, Krishna
kaust.personSaikaly, Pascal
refterms.dateFOA2018-06-13T13:25:05Z


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This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Except where otherwise noted, this item's license is described as This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.