Carbon monoxide conversion and syngas biomethanation mediated by different microbial consortia
2020
Li, Chunxing | Zhu, Xinyu | Angelidaki, I.
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.
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