Journal
BIORESOURCE TECHNOLOGY
Volume 286, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121413
Keywords
Biogas upgrading; Gas fermentation; Microbial community; Acetogens; Acetyl-CoA pathway
Funding
- Novo Nordisk Foundation [NNF16OC0021568]
- Danish Council for Independent Research [DFF-1335-00142]
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The present study proposes a novel alternative method of the current biogas upgrading techniques by converting CO2 (in the biogas) into valuable chemicals (e.g., volatile fatty acids) using H-2 as energy source and acetogenic mixed culture as biocatalyst. The influence of thermal treatment (90 degrees C) on the inhibition of the methanogenic archaea and enriching the acetogenic bacteria in different inocula (mesophilic and thermophilic) was initially tested. The most efficient inoculum that achieved the highest performance through the fermentation process was further used to define the optimum H-2/CO2 gas ratio that secures maximum production yield of chemicals and maximum biogas upgrading efficiency. In addition, 16S rRNA analysis of the microbial community was conducted at the end of the experimental period to target functional microbes. The maximum biogas content (77% (v/v)) and acetate yield (72%) were achieved for 2H(2):1CO(2) ratio (v/v), with Moorella sp. 4 as the most dominant thermophilic acetogenic bacterium.
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