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Humin Assists Reductive Acetogenesis in Absence of Other External Electron Donor

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  • Mahasweta Laskar

    (Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
    Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan)

  • Takuya Kasai

    (Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
    Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan)

  • Takanori Awata

    (National Institute for Land and Infrastructure Management, Tsukuba 305-0804, Japan)

  • Arata Katayama

    (Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
    Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan)

Abstract

The utilization of extracellular electron transfer by microorganism is highly engaging for remediation of toxic pollutants under “energy-starved” conditions. Humin, an organo-mineral complex of soil, has been instrumental as an external electron mediator for suitable electron donors in the remediative works of reductive dehalogenation, denitrification, and so forth. Here, we report, for the first time, that humin assists microbial acetogenesis as the extracellular electron donor using the electron acceptor CO 2 . Humin was obtained from Kamajima paddy soil, Japan. The anaerobic acetogenic consortium in mineral medium containing CO 2 / HCO 3 − as the inorganic carbon source used suspended humin as the energy source under mesophilic dark conditions. Retardation of acetogenesis under the CO 2 -deficient conditions demonstrated that humin did not function as the organic carbon source but as electron donor in the CO 2 -reducing acetogenesis. The consortium with humin also achieved anaerobic dechlorination with limited methanogenic activity. Total electron-donating capacity of humin was estimated at about 87 µeeq/g-humin. The metagenomic sequencing of 16S rRNA genes showed the predominance of Firmicutes (71.8 ± 2.5%) in the consortium, and Lachno spiraceae and Ruminococcaceae were considered as the CO 2 -reducing acetogens in the consortium. Thus, microbial fixation of CO 2 using humin introduces new insight to the holistic approach for sustainable treatment of contaminants in environment.

Suggested Citation

  • Mahasweta Laskar & Takuya Kasai & Takanori Awata & Arata Katayama, 2020. "Humin Assists Reductive Acetogenesis in Absence of Other External Electron Donor," IJERPH, MDPI, vol. 17(12), pages 1-13, June.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:12:p:4211-:d:370824
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    References listed on IDEAS

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    1. Mahasweta Laskar & Takanori Awata & Takuya Kasai & Arata Katayama, 2019. "Anaerobic Dechlorination by a Humin-Dependent Pentachlorophenol-Dechlorinating Consortium under Autotrophic Conditions Induced by Homoacetogenesis," IJERPH, MDPI, vol. 16(16), pages 1-13, August.
    2. Margaret S. Torn & Susan E. Trumbore & Oliver A. Chadwick & Peter M. Vitousek & David M. Hendricks, 1997. "Mineral control of soil organic carbon storage and turnover," Nature, Nature, vol. 389(6647), pages 170-173, September.
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    Cited by:

    1. Tingting Hu & Duyen Minh Pham & Takuya Kasai & Arata Katayama, 2022. "The Emergence of Extracellular Electron Mediating Functionality in Rice Straw-Artificial Soil Mixture during Humification," IJERPH, MDPI, vol. 19(22), pages 1-18, November.
    2. Biec Nhu Ha & Duyen Minh Pham & Takuya Kasai & Takanori Awata & Arata Katayama, 2022. "Effect of Humin and Chemical Factors on CO 2 -Fixing Acetogenesis and Methanogenesis," IJERPH, MDPI, vol. 19(5), pages 1-16, February.

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