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Tytuł:
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Enrichment of salt-tolerant CO 2 -fixing communities in microbial electrosynthesis systems using porous ceramic hollow tube wrapped with carbon cloth as cathode and for CO 2 supply.
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Autorzy:
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Alqahtani MF; Biological and Environmental Science and Engineering (BESE) Division, Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Bajracharya S; Biological and Environmental Science and Engineering (BESE) Division, Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Katuri KP; Biological and Environmental Science and Engineering (BESE) Division, Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Ali M; Biological and Environmental Science and Engineering (BESE) Division, Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Xu J; Biological and Environmental Science and Engineering (BESE) Division, Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Alarawi MS; Computational Biosciences Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Saikaly PE; Biological and Environmental Science and Engineering (BESE) Division, Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia. Electronic address: .
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Źródło:
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The Science of the total environment [Sci Total Environ] 2021 Apr 20; Vol. 766, pp. 142668. Date of Electronic Publication: 2020 Oct 05.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Amsterdam, Elsevier.
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MeSH Terms:
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Carbon*
Carbon Dioxide*
Ceramics ; Electrodes ; Porosity
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Contributed Indexing:
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Keywords: CO(2) reduction; CO(2) valorization; Carbon capture and utilization; Dual-function cathode; Salt-tolerant chemolithoautotrophs
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Substance Nomenclature:
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142M471B3J (Carbon Dioxide)
7440-44-0 (Carbon)
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Entry Date(s):
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Date Created: 20201020 Date Completed: 20210218 Latest Revision: 20210218
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Update Code:
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20240105
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DOI:
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10.1016/j.scitotenv.2020.142668
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PMID:
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33077225
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Microbial inocula from marine origins are less explored for CO 2 reduction in microbial electrosynthesis (MES) system, although effective CO 2 -fixing communities in marine environments are well-documented. We explored natural saline habitats, mainly salt marsh (SM) and mangrove (M) sediments, as potential inoculum sources for enriching salt-tolerant CO 2 reducing community using two enrichment strategies: H 2 :CO 2 (80:20) enrichment in serum vials and enrichment in cathode chamber of MES reactors operated at -1.0 V vs. Ag/AgCl. Porous ceramic hollow tube wrapped with carbon cloth was used as cathode and for direct CO 2 delivery to CO 2 reducing communities growing on the cathode surface. Methanogenesis was dominant in both the M- and SM-seeded MES and the methanogenic Archaea Methanococcus was the most dominant genus. Methane production was slightly higher in the SM-seeded MES (4.9 ± 1.7 mmol) compared to the M-seeded MES (3.8 ± 1.1 mmol). In contrast, acetate production was almost two times higher in the M-seeded MES (3.1 ± 0.9 mmol) than SM-seeded MES (1.5 ± 1.3 mmol). The high relative abundance of the genus Acetobacterium in the M-seeded serum vials correlates with the high acetate production obtained. The different enrichment strategies affected the community composition, though the communities in MES reactors and serum vials were performing similar functions (methanogenesis and acetogenesis). Despite similar operating conditions, the microbial community composition of M-seeded serum vials and MES reactors differed from the SM-seeded serum vials and MES reactors, supporting the importance of inoculum source in the evolution of CO 2 -reducing microbial communities.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
