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Acidic and thermal pre-treatments for anaerobic digestion inoculum to improve hydrogen and volatile fatty acid production using xylose as the substrate

Author

Listed:
  • Mockaitis, Gustavo
  • Bruant, Guillaume
  • Guiot, Serge R.
  • Peixoto, Guilherme
  • Foresti, Eugenio
  • Zaiat, Marcelo

Abstract

Xylose is a by-product of lignocellulosic biomass processing for production of second-generation biofuels and could be suitable for bioproduct manufacturing. This paper describes an innovative approach that enables the system to achieve high yielding for hydrogen production. The study compared 4 physicochemical pre-treatments performed in an anaerobic mixed culture (acidic, thermal, acidic-thermal and thermal acidic) to achieve an inoculum with a high-efficiency xylose to hydrogen conversion under mesophilic conditions (30 °C). The acidic pre-treatment was the most efficient to select microorganisms able to produce hydrogen and volatile acid from xylose. Kinetics has shown that acidic pre-treatment had a hydrogen/xylose molar yielding factor of 1.57 (molar base) and a hydrogen maximum production rate of 253 mL H2 h−1. Mass balance considered all possible metabolic pathways using xylose as a substrate. Anaerobic degradation of ethanol was the most active pathway for hydrogen production in all experiments, except for the control. Each pre-treatment performed for the original inoculum resulted in different microbiological profiles, but the genus Clostridium was the most abundant in all assays. Acidic pre-treatment stimulated the growth of organisms from the genera Peptostreptococcaceae, Truepera and Kurthia, which could be related to the better results in hydrogen production found in this condition.

Suggested Citation

  • Mockaitis, Gustavo & Bruant, Guillaume & Guiot, Serge R. & Peixoto, Guilherme & Foresti, Eugenio & Zaiat, Marcelo, 2020. "Acidic and thermal pre-treatments for anaerobic digestion inoculum to improve hydrogen and volatile fatty acid production using xylose as the substrate," Renewable Energy, Elsevier, vol. 145(C), pages 1388-1398.
  • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:1388-1398
    DOI: 10.1016/j.renene.2019.06.134
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    Cited by:

    1. Moreira, F.S. & Rodrigues, M.S. & Sousa, L.M. & Batista, F.R.X. & Ferreira, J.S. & Cardoso, V.L., 2022. "Single-stage repeated batch cycles using co-culture of Enterobacter cloacae and purple non-sulfur bacteria for hydrogen production," Energy, Elsevier, vol. 239(PE).
    2. Ekwenna, Emeka Boniface & Tabraiz, Shamas & Wang, Yaodong & Roskilly, Anthony, 2023. "Exploring the feasibility of biological hydrogen production using seed sludge pretreated with agro-industrial wastes," Renewable Energy, Elsevier, vol. 215(C).
    3. Li, Jiangbo & Wang, Kai & Wang, Shaojie & Su, Haijia, 2023. "Spatially-ordered layer-by-layer biofilms of a two-species microbial consortium promote hydrogen production," Renewable Energy, Elsevier, vol. 215(C).

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