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Production of chemicals from C1 gases (CO, CO2) by Clostridium carboxidivorans

  • Ánxela Fernández-Naveira
  • Haris Nalakath Abubackar
  • María C. Veiga
  • Christian Kennes
Review

Abstract

Bioprocesses in conventional second generation biorefineries are mainly based on the fermentation of sugars obtained from lignocellulosic biomass or agro-industrial wastes. An alternative to this process consists in gasifying those same feedstocks or even other carbon-containing materials to obtain syngas which can also be fermented by some anaerobic bacteria to produce chemicals or fuels. Carbon monoxide, carbon dioxide and hydrogen, which are the main components of syngas, are also found in some industrial waste gases, among others in steel industries. Clostridium carboxidivorans is able to metabolise such gases to produce ethanol and higher alcohols, i.e. butanol and hexanol, following the Wood–Ljungdahl pathway. This does simultaneously allow the removal of volatile pollutants involved in climate change. The bioconversion is a two step process in which organic acids (acetate, butyrate, hexanoate) are produced first, followed by the accumulation of alcohols; although partial overlap in time of acids and alcohols production may sometimes take place as well. Several parameters, among others pH, temperature, or gas-feed flow rates in bioreactors, affect the bioconversion process. Besides, the accumulation of high concentrations of alcohols in the fermentation broth inhibits the growth and metabolic activity of C. carboxidivorans.

Keywords

Acetogens Clostridia Greenhouse gases Syngas Waste gas 

Notes

Acknowledgements

The authors thank Prof. I. Maddox and the WJMB for inviting them to prepare this manuscript. AFN acknowledges a pre-doctoral fellowship from the Xunta de Galicia (Spain).

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Ánxela Fernández-Naveira
    • 1
  • Haris Nalakath Abubackar
    • 1
  • María C. Veiga
    • 1
  • Christian Kennes
    • 1
  1. 1.Chemical Engineering Laboratory, Faculty of Sciences and Center for Advanced Scientific Research (CICA)University of La CoruñaLa CoruñaSpain

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