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Direct utilization of industrial carbon dioxide with low impurities for acetate production via microbial electrosynthesis. | LitMetric

Direct utilization of industrial carbon dioxide with low impurities for acetate production via microbial electrosynthesis.

Bioresour Technol

Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Mohali (IISER Mohali), Sector 81, S.A.S. Nagar, Manauli PO 140306, Punjab, India. Electronic address:

Published: January 2021

The present study aimed to demonstrate the utilization of unpurified industrial CO with low impurities for acetate production via microbial electrosynthesis (MES) for the first time. In MES experiments with CO-rich brewery gas, the enriched mixed culture dominated by Acetobacterium produced 1.8 ± 0.2 g/L acetic acid at 0.26 ± 0.03 g/L/d rate and outperformed a pure culture of Clostridium ljungdahlii (1.1 ± 0.02 g/L; 0.138 ± 0.004 g/L/d). The electron recovery in acetic acid was also more for mixed culture (84 ± 13%) than C. ljungdahlii (42 ± 14%). Electrochemical analysis of biocathodes suggested the role of microbial biofilm in improved hydrogen electrocatalysis. In comparative gas fermentation tests, the mixed culture outperformed C. ljungdahlii and produced acetic acid at a similar level with both industrial and pure CO feedstocks. These results suggest the robustness and capability of the mixed microbial community for utilizing slightly impure industrial CO for bioproduction and presents a major advancement in MES technology.

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Source
http://dx.doi.org/10.1016/j.biortech.2020.124289DOI Listing

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