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Lignin Syngas Bioconversion by Butyribacterium methylotrophicum : Advancing towards an Integrated Biorefinery

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  • Marta Pacheco

    (LNEG, Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 1649-038 Lisboa, Portugal
    Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal)

  • Filomena Pinto

    (LNEG, Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 1649-038 Lisboa, Portugal)

  • Joana Ortigueira

    (LNEG, Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 1649-038 Lisboa, Portugal
    Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal)

  • Carla Silva

    (Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal)

  • Francisco Gírio

    (LNEG, Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 1649-038 Lisboa, Portugal)

  • Patrícia Moura

    (LNEG, Laboratório Nacional de Energia e Geologia, Unidade de Bioenergia e Biorrefinarias, Estrada do Paço do Lumiar, 1649-038 Lisboa, Portugal)

Abstract

Hybrid bio-thermochemical based technologies have the potential to ensure greater feedstock flexibility for the production of bioenergy and bioproducts. This study focused on the bioconversion of syngas produced from low grade technical lignin to C 2 -/C 4 -carboxylic acids by Butyribacterium methylotrophicum . The effects of pH, medium supplementation and the use of crude syngas were analyzed. At pH 6.0, B. methylotrophicum consumed CO, CO 2 and H 2 simultaneously up to 87 mol% of carbon fixation, and the supplementation of the medium with acetate increased the production of butyrate by 6.3 times. In long-term bioreactor experiments, B. methylotrophicum produced 38.3 and 51.1 mM acetic acid and 0.7 and 2.0 mM butyric acid from synthetic and lignin syngas, respectively. Carbon fixation reached 83 and 88 mol%, respectively. The lignin syngas conversion rate decreased from 13.3 to 0.9 NmL/h throughout the assay. The appearance of a grayish pellet and cell aggregates after approximately 220 h was indicative of tar deposition. Nevertheless, the stressed cells remained metabolically active and maintained acetate and butyrate production from lignin syngas. The challenge that impurities represent in the bioconversion of crude syngas has a direct impact on syngas cleaning requirements and operation costs, supporting the pursuit for more robust and versatile acetogens.

Suggested Citation

  • Marta Pacheco & Filomena Pinto & Joana Ortigueira & Carla Silva & Francisco Gírio & Patrícia Moura, 2021. "Lignin Syngas Bioconversion by Butyribacterium methylotrophicum : Advancing towards an Integrated Biorefinery," Energies, MDPI, vol. 14(21), pages 1-16, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7124-:d:669711
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    Citations

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    Cited by:

    1. Marta Pacheco & Filomena Pinto & Anders Brunsvik & Rui André & Paula Marques & Ricardo Mata & Joana Ortigueira & Francisco Gírio & Patrícia Moura, 2023. "Effects of Lignin Gasification Impurities on the Growth and Product Distribution of Butyribacterium methylotrophicum during Syngas Fermentation," Energies, MDPI, vol. 16(4), pages 1-17, February.
    2. Marta Pacheco & Patrícia Moura & Carla Silva, 2023. "A Systematic Review of Syngas Bioconversion to Value-Added Products from 2012 to 2022," Energies, MDPI, vol. 16(7), pages 1-24, April.

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