Graphene-Coated Hollow Fiber Membrane as the Cathode in Anaerobic Electrochemical Membrane Bioreactors - Effect of Configuration and Applied Voltage on Performance and Membrane Fouling

Craig M. Werner, Krishna P. Katuri, Ananda Rao Hari, Wei Chen, Zhiping Lai, Bruce Ernest Logan, Gary L. Amy, Pascal E. Saikaly

Research output: Contribution to journalArticle

25 Citations (Scopus)

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 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 that in 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.

Original languageEnglish (US)
Pages (from-to)4439-4447
Number of pages9
JournalEnvironmental Science and Technology
Volume50
Issue number8
DOIs
StatePublished - May 3 2016

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Membrane fouling
Graphite
Bioreactors
fouling
bioreactor
Cathodes
Biofouling
membrane
Membranes
Fibers
Electric potential
biofouling
Hydrogen production
hydrogen
Suspensions
Current density
Cells
reactor
effect
fibre

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Werner, Craig M. ; Katuri, Krishna P. ; Hari, Ananda Rao ; Chen, Wei ; Lai, Zhiping ; Logan, Bruce Ernest ; Amy, Gary L. ; Saikaly, Pascal E. / Graphene-Coated Hollow Fiber Membrane as the Cathode in Anaerobic Electrochemical Membrane Bioreactors - Effect of Configuration and Applied Voltage on Performance and Membrane Fouling. In: Environmental Science and Technology. 2016 ; Vol. 50, No. 8. pp. 4439-4447.
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Graphene-Coated Hollow Fiber Membrane as the Cathode in Anaerobic Electrochemical Membrane Bioreactors - Effect of Configuration and Applied Voltage on Performance and Membrane Fouling. / Werner, Craig M.; Katuri, Krishna P.; Hari, Ananda Rao; Chen, Wei; Lai, Zhiping; Logan, Bruce Ernest; Amy, Gary L.; Saikaly, Pascal E.

In: Environmental Science and Technology, Vol. 50, No. 8, 03.05.2016, p. 4439-4447.

Research output: Contribution to journalArticle

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AU - Werner, Craig M.

AU - Katuri, Krishna P.

AU - Hari, Ananda Rao

AU - Chen, Wei

AU - Lai, Zhiping

AU - Logan, Bruce Ernest

AU - Amy, Gary L.

AU - Saikaly, Pascal E.

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