Graphene-coated hollow fiber membrane as the cathode in anaerobic electrochemical membrane bioreactors – Effect of configuration and applied voltage on performance and membrane fouling

Handle URI:
http://hdl.handle.net/10754/592615
Title:
Graphene-coated hollow fiber membrane as the cathode in anaerobic electrochemical membrane bioreactors – Effect of configuration and applied voltage on performance and membrane fouling
Authors:
Werner, Craig M.; Katuri, Krishna; Rao, Hari Ananda ( 0000-0002-8916-1809 ) ; Chen, Wei; Lai, Zhiping ( 0000-0001-9555-6009 ) ; Logan, Bruce E.; Amy, Gary L.; Saikaly, Pascal ( 0000-0001-7678-3986 )
Abstract:
Electrically conductive, graphene-coated hollow-fiber porous membranes were used as cathodes in anaerobic electrochemical membrane bioreactors (AnEMBRs) operated at different applied voltages (0.7 V and 0.9 V) using a new rectangular reactor configuration, compared to a previous tubular design (0.7 V). The onset of biofouling was delayed and minimized in rectangular reactors operated at 0.9 V, compared to those at 0.7 V due to higher rates of hydrogen production. Maximum transmembrane pressures for the rectangular reactor were only 0.10 bar (0.7 V) or 0.05 bar (0.9 V) after 56 days of operation, compared to 0.46 bar (0.7 V) for the tubular reactor after 52 days. The thickness of the membrane biofouling layer was approximately 0.4 µm for rectangular reactors and 4 µm for the tubular reactor. Higher permeate quality (TSS = 0.05 mg/L) was achieved in the rectangular AnEMBR than the tubular AnEMBR (TSS = 17 mg/L), likely due to higher current densities that minimized the accumulation of cells in suspension. These results show that the new rectangular reactor design, which had increased rates of hydrogen production, successfully delayed the onset of cathode biofouling and improved reactor performance.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC); Advanced Membranes and Porous Materials Research Center
Citation:
Graphene-coated hollow fiber membrane as the cathode in anaerobic electrochemical membrane bioreactors – Effect of configuration and applied voltage on performance and membrane fouling 2015 Environmental Science & Technology
Publisher:
American Chemical Society (ACS)
Journal:
Environmental Science & Technology
Issue Date:
22-Dec-2015
DOI:
10.1021/acs.est.5b02833
PubMed ID:
26691927
Type:
Article
ISSN:
0013-936X; 1520-5851
Additional Links:
http://pubs.acs.org/doi/10.1021/acs.est.5b02833
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorWerner, Craig M.en
dc.contributor.authorKaturi, Krishnaen
dc.contributor.authorRao, Hari Anandaen
dc.contributor.authorChen, Weien
dc.contributor.authorLai, Zhipingen
dc.contributor.authorLogan, Bruce E.en
dc.contributor.authorAmy, Gary L.en
dc.contributor.authorSaikaly, Pascalen
dc.date.accessioned2015-12-27T13:37:31Zen
dc.date.available2015-12-27T13:37:31Zen
dc.date.issued2015-12-22en
dc.identifier.citationGraphene-coated hollow fiber membrane as the cathode in anaerobic electrochemical membrane bioreactors – Effect of configuration and applied voltage on performance and membrane fouling 2015 Environmental Science & Technologyen
dc.identifier.issn0013-936Xen
dc.identifier.issn1520-5851en
dc.identifier.pmid26691927-
dc.identifier.doi10.1021/acs.est.5b02833en
dc.identifier.urihttp://hdl.handle.net/10754/592615en
dc.description.abstractElectrically conductive, graphene-coated hollow-fiber porous membranes were used as cathodes in anaerobic electrochemical membrane bioreactors (AnEMBRs) operated at different applied voltages (0.7 V and 0.9 V) using a new rectangular reactor configuration, compared to a previous tubular design (0.7 V). The onset of biofouling was delayed and minimized in rectangular reactors operated at 0.9 V, compared to those at 0.7 V due to higher rates of hydrogen production. Maximum transmembrane pressures for the rectangular reactor were only 0.10 bar (0.7 V) or 0.05 bar (0.9 V) after 56 days of operation, compared to 0.46 bar (0.7 V) for the tubular reactor after 52 days. The thickness of the membrane biofouling layer was approximately 0.4 µm for rectangular reactors and 4 µm for the tubular reactor. Higher permeate quality (TSS = 0.05 mg/L) was achieved in the rectangular AnEMBR than the tubular AnEMBR (TSS = 17 mg/L), likely due to higher current densities that minimized the accumulation of cells in suspension. These results show that the new rectangular reactor design, which had increased rates of hydrogen production, successfully delayed the onset of cathode biofouling and improved reactor performance.en
dc.language.isoenen
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/10.1021/acs.est.5b02833en
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science & Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/10.1021/acs.est.5b02833.en
dc.titleGraphene-coated hollow fiber membrane as the cathode in anaerobic electrochemical membrane bioreactors – Effect of configuration and applied voltage on performance and membrane foulingen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.identifier.journalEnvironmental Science & Technologyen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, USAen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorWerner, Craig M.en
kaust.authorKaturi, Krishnaen
kaust.authorRao, Hari Anandaen
kaust.authorChen, Weien
kaust.authorLai, Zhipingen
kaust.authorAmy, Gary L.en
kaust.authorSaikaly, Pascalen

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