Biological CO2 fixation in up-flow reactors via exogenous H2 addition

P. G. Kougias, Panagiotis Tsapekos*, L Treu, M Kostoula, S Campanaro, G Lyberatos, Irini Angelidaki

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Gas fermentation for the production of building block molecules and biofuels is lately gaining attention as a means to eliminate the greenhouse gases emissions. Especially CO2 capture and recycling are in focus. Thus, the biological coupling of CO2 and H2 is of high interest. Therefore, the focus of the present work was to evaluate the performances of two up-flow reactors for CO2 and H2 assimilation. Process monitoring showed that the gas-liquid H2 transfer was highly affected by reactor design. A reactor filled with Raschig rings could lift up gases utilization leading to a CH4 content of 81% at 6 h gas retention time and 8.8 L/LR.h gas recirculation rate. In contrast, limited biomethanation was achieved in the absence of Raschig rings highlighting the positive role of packing material to the performance of up-flow-reactors. Additionally, high-throughput 16S rRNA sequencing revealed that the microbial community was ultimately resided by Methanothermobacter methanogens.

Original languageEnglish
JournalJournal of Biotechnology
Volume319
Pages (from-to)1-7
ISSN0168-1656
DOIs
Publication statusPublished - 2020

Keywords

  • CO2fixation
  • Packed column reactors
  • Hydrogenotrophic methanogenesis
  • Homoacetogenesis
  • Anaerobic digestion

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