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Ex-situ biogas upgrading in thermophilic up-flow reactors: The effect of different gas diffusers and gas retention times

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  • Parisa Ghofrani-Isfahani, Technical University of Denmark
  • ,
  • Panagiotis Tsapekos, Technical University of Denmark
  • ,
  • Maria Peprah, Technical University of Denmark
  • ,
  • Panagiotis Kougias, Hellenic Agricultural Organisation “DEMETER”
  • ,
  • Xinyu Zhu, Technical University of Denmark
  • ,
  • Adam Kovalovszki, Technical University of Denmark
  • ,
  • Athanasios Zervas
  • Xiao Zha, Suzhou University of Science and Technology
  • ,
  • Carsten S. Jacobsen
  • Irini Angelidaki, Technical University of Denmark

Four different types of ceramic gas distributors (Al2O3 of 1.2 μm and SiC of 0.5, 7 and 14 μm) were evaluated to increase biomethane formation during ex-situ biogas upgrading process. Each type of gas diffuser was tested independently at three different gas retention times of 10, 5 and 2.5 h, at thermophilic conditions. CH4 production rate increased by increasing input gas flow rate for all type of distributors, whereas CH4 concentration declined. Reactors equipped with SiC gas distributors effectively improved biomethane content fulfilling natural gas standards. Microbial analysis showed high abundance of hydrogenotrophic methanogens and proliferated syntrophic bacteria, i.e. syntrophic acetate oxidizers and homoacetogens, confirming the effect of H2 to alternate anaerobic digestion microbiome and enhance hydrogenotrophic methanogenesis. A detailed anaerobic bioconversion model was adapted to simulate the operation of the R1-R4 reactors. The model was shown to be effective for the simulation of biogas upgrading process in up-flow reactors.

Original languageEnglish
Article number125694
JournalBioresource Technology
Publication statusPublished - Nov 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

    Research areas

  • 16S rRNA gene sequencing, Biomethanation, Ceramic membrane, Ex-situ biogas upgrading, Gas-liquid mass transfer rate

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