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    Enrichment of salt-tolerant CO2-fixing communities in microbial electrosynthesis systems using porous ceramic hollow tube wrapped with carbon cloth as cathode and for CO2 supply.

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    Alqahtani et al_Accepted Manuscript_KAUST Repository.docx
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    Type
    Article
    Authors
    AlQahtani, Manal Faisal cc
    Bajracharya, Suman cc
    Katuri, Krishna
    Ali, Muhammad
    Xu, Jiajie
    Alarawi, Mohammed S
    Saikaly, Pascal cc
    KAUST Department
    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.
    Biological and Environmental Sciences and Engineering (BESE) Division
    Computational Biosciences Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
    Environmental Biotechnology Research Group
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    URF/1/2985-01-01
    Date
    2020-10-05
    Online Publication Date
    2020-10-05
    Print Publication Date
    2020-10
    Embargo End Date
    2022-10-20
    Submitted Date
    2020-06-25
    Permanent link to this record
    http://hdl.handle.net/10754/665650
    
    Metadata
    Show full item record
    Abstract
    Microbial inocula from marine origins are less explored for CO2 reduction in microbial electrosynthesis (MES) system, although effective CO2-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 CO2 reducing community using two enrichment strategies: H2:CO2 (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 CO2 delivery to CO2 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 CO2-reducing microbial communities.
    Citation
    Alqahtani, M. F., Bajracharya, S., Katuri, K. P., Ali, M., Xu, J., Alarawi, M. S., & Saikaly, P. E. (2020). Enrichment of salt-tolerant CO2–fixing communities in microbial electrosynthesis systems using porous ceramic hollow tube wrapped with carbon cloth as cathode and for CO2 supply. Science of The Total Environment, 142668. doi:10.1016/j.scitotenv.2020.142668
    Sponsors
    This work was supported by Competitive Research Grant (URF/1/2985-01-01) from King Abdullah University of Science and Technology to P.E.S.
    Publisher
    Elsevier BV
    Journal
    Science of The Total Environment
    DOI
    10.1016/j.scitotenv.2020.142668
    PubMed ID
    33077225
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0048969720361970
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.scitotenv.2020.142668
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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