Carbon monoxide conversion and syngas biomethanation mediated by different microbial consortia

Chunxing Li, Xinyu Zhu*, Irini Angelidaki

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Syngas biomethanation is an attractive process for extending application of gasification products. In the present study, anaerobic sludges from three methanogenic reactors feeding cattle manure (CS), sewage sludge (SS) and gaseous H2/CO2 (GS) were used to investigate the effect of microbial consortia composition on syngas biomethanation. The results showed that CS presented the highest CO consumption rate due to its highest relative abundance of CO consuming bacteria. The CO was mainly converted to acetate, and syntrophic acetate oxidization (SAO) bacteria converted acetate to H2/CO2 for hydrogenotrophic methanogenesis in CS and SS. However, acetate was accumulated in GS for lacking acetoclastic methanogens and SAO bacteria, leading to lower biomethanation efficiency. Additionally, adding stoichiometric H2 could convert CO and CO2 to nearly pure methane, while, the CO consumption rate declined in H2 added systems. The results present novel insights into microbial consortia on CO conversion and syngas biomethanation.

Original languageEnglish
Article number123739
JournalBioresource Technology
Volume314
Number of pages9
ISSN0960-8524
DOIs
Publication statusPublished - 2020

Keywords

  • Biomethanation efficiency
  • CO conversion
  • Energy
  • Microbial component
  • Syngas

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