Enrichment of extremophilic exoelectrogens in microbial electrolysis cells using Red Sea brine pools as inocula

Noura A. Chehab; Juan F. Ortiz Medina; Krishna Katuri; Hari Ananda Rao; Gary L. Amy; Bruce E. Logan; Pascal Saikaly

doi:10.1016/j.biortech.2017.04.122

Enrichment of extremophilic exoelectrogens in microbial electrolysis cells using Red Sea brine pools as inocula

Noura A. Chehab, Juan F. Ortiz Medina, Krishna Katuri, Hari Ananda Rao, Gary L. Amy, Bruce E. Logan, Pascal Saikaly

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

Applying microbial electrochemical technologies for the treatment of highly saline or thermophilic solutions is challenging due to the lack of proper inocula to enrich for efficient exoelectrogens. Brine pools from three different locations (Valdivia, Atlantis II and Kebrit) in the Red Sea were investigated as potential inocula sources for enriching exoelectrogens in microbial electrolysis cells (MECs) under thermophilic (70°C) and hypersaline (25% salinity) conditions. Of these, only the Valdivia brine pool produced high and consistent current 6.8 ± 2.1 A/m2-anode in MECs operated at a set anode potential of +0.2 V vs. Ag/AgCl (+0.405 V vs. standard hydrogen electrode). These results show that exoelectrogens are present in these extreme environments and can be used to startup MEC under thermophilic and hypersaline conditions. Bacteroides was enriched on the anode of the Valdivia MEC, but it was not detected in the open circuit voltage reactor seeded with the Valdivia brine pool.

Original language	English (US)
Pages (from-to)	82-86
Number of pages	5
Journal	Bioresource Technology
Volume	239
DOIs	https://doi.org/10.1016/j.biortech.2017.04.122
State	Published - May 3 2017

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10.1016/j.biortech.2017.04.122

https://repository.kaust.edu.sa/bitstream/10754/623408/1/1-s2.0-S0960852417306302-main.pdf

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@article{bc033207dc3c4fb7b4f488937b745b6a,

title = "Enrichment of extremophilic exoelectrogens in microbial electrolysis cells using Red Sea brine pools as inocula",

abstract = "Applying microbial electrochemical technologies for the treatment of highly saline or thermophilic solutions is challenging due to the lack of proper inocula to enrich for efficient exoelectrogens. Brine pools from three different locations (Valdivia, Atlantis II and Kebrit) in the Red Sea were investigated as potential inocula sources for enriching exoelectrogens in microbial electrolysis cells (MECs) under thermophilic (70°C) and hypersaline (25% salinity) conditions. Of these, only the Valdivia brine pool produced high and consistent current 6.8 ± 2.1 A/m2-anode in MECs operated at a set anode potential of +0.2 V vs. Ag/AgCl (+0.405 V vs. standard hydrogen electrode). These results show that exoelectrogens are present in these extreme environments and can be used to startup MEC under thermophilic and hypersaline conditions. Bacteroides was enriched on the anode of the Valdivia MEC, but it was not detected in the open circuit voltage reactor seeded with the Valdivia brine pool.",

author = "Chehab, {Noura A.} and {Ortiz Medina}, {Juan F.} and Krishna Katuri and Rao, {Hari Ananda} and Amy, {Gary L.} and Logan, {Bruce E.} and Pascal Saikaly",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): FCC/1/1971-05-01 Acknowledgements: This work was sponsored Center Competitive Funding Program (FCC/1/1971-05-01) to P.E.S. from King Abdullah University of Science and Technology (KAUST).",

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TY - JOUR

T1 - Enrichment of extremophilic exoelectrogens in microbial electrolysis cells using Red Sea brine pools as inocula

AU - Chehab, Noura A.

AU - Ortiz Medina, Juan F.

AU - Katuri, Krishna

AU - Rao, Hari Ananda

AU - Amy, Gary L.

AU - Logan, Bruce E.

AU - Saikaly, Pascal

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): FCC/1/1971-05-01 Acknowledgements: This work was sponsored Center Competitive Funding Program (FCC/1/1971-05-01) to P.E.S. from King Abdullah University of Science and Technology (KAUST).

PY - 2017/5/3

Y1 - 2017/5/3

N2 - Applying microbial electrochemical technologies for the treatment of highly saline or thermophilic solutions is challenging due to the lack of proper inocula to enrich for efficient exoelectrogens. Brine pools from three different locations (Valdivia, Atlantis II and Kebrit) in the Red Sea were investigated as potential inocula sources for enriching exoelectrogens in microbial electrolysis cells (MECs) under thermophilic (70°C) and hypersaline (25% salinity) conditions. Of these, only the Valdivia brine pool produced high and consistent current 6.8 ± 2.1 A/m2-anode in MECs operated at a set anode potential of +0.2 V vs. Ag/AgCl (+0.405 V vs. standard hydrogen electrode). These results show that exoelectrogens are present in these extreme environments and can be used to startup MEC under thermophilic and hypersaline conditions. Bacteroides was enriched on the anode of the Valdivia MEC, but it was not detected in the open circuit voltage reactor seeded with the Valdivia brine pool.

AB - Applying microbial electrochemical technologies for the treatment of highly saline or thermophilic solutions is challenging due to the lack of proper inocula to enrich for efficient exoelectrogens. Brine pools from three different locations (Valdivia, Atlantis II and Kebrit) in the Red Sea were investigated as potential inocula sources for enriching exoelectrogens in microbial electrolysis cells (MECs) under thermophilic (70°C) and hypersaline (25% salinity) conditions. Of these, only the Valdivia brine pool produced high and consistent current 6.8 ± 2.1 A/m2-anode in MECs operated at a set anode potential of +0.2 V vs. Ag/AgCl (+0.405 V vs. standard hydrogen electrode). These results show that exoelectrogens are present in these extreme environments and can be used to startup MEC under thermophilic and hypersaline conditions. Bacteroides was enriched on the anode of the Valdivia MEC, but it was not detected in the open circuit voltage reactor seeded with the Valdivia brine pool.

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U2 - 10.1016/j.biortech.2017.04.122

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VL - 239

SP - 82

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JO - Bioresource Technology

JF - Bioresource Technology

ER -

Enrichment of extremophilic exoelectrogens in microbial electrolysis cells using Red Sea brine pools as inocula

Abstract

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