Biological CO 2 fixation in up-flow reactors via exogenous H 2 addition

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 CO capture and recycling are in focus. Thus, the biological coupling of CO and H is of high interest. Therefore, the focus of th...

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Bibliographic Details
Published in:Journal of biotechnology 2020-08, Vol.319, p.1
Main Authors: Kougias, P G, Tsapekos, P, Treu, L, Kostoula, M, Campanaro, S, Lyberatos, G, Angelidaki, I
Format: Article
Language:English
Subjects:
Anaerobiosis
Biofuels
Bioreactors - microbiology
Carbon Cycle - physiology
Carbon Dioxide - metabolism
Hydrogen - metabolism
Methane - metabolism
Methanobacteriaceae - genetics
Methanobacteriaceae - metabolism
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Summary: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 CO capture and recycling are in focus. Thus, the biological coupling of CO and H is of high interest. Therefore, the focus of the present work was to evaluate the performances of two up-flow reactors for CO and H assimilation. Process monitoring showed that the gas-liquid H transfer was highly affected by reactor design. A reactor filled with Raschig rings could lift up gases utilization leading to a CH content of 81% at 6 h gas retention time and 8.8 L/L .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.
ISSN:1873-4863