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

Parisa Ghofrani-Isfahani, Panagiotis Tsapekos*, Maria Peprah, Panagiotis Kougias, Xinyu Zhu, Adam Kovalovszki, Athanasios Zervas, Xiao Zha*, Carsten S. Jacobsen, Irini Angelidaki

*Corresponding author for this work

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Abstract

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
Volume340
ISSN0960-8524
DOIs
Publication statusPublished - 2021

Keywords

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

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