In:
Frontiers in Bioengineering and Biotechnology, Frontiers Media SA, Vol. 10 ( 2022-9-9)
Abstract:
Carbon capture and utilization has been proposed as one strategy to combat global warming. Microbial electrolysis cells (MECs) combine the biological conversion of carbon dioxide (CO 2 ) with the formation of valuable products such as methane. This study was motivated by the surprising gap in current knowledge about the utilization of real exhaust gas as a CO 2 source for methane production in a fully biocatalyzed MEC. Therefore, two steel mill off-gases differing in composition were tested in a two-chamber MEC, consisting of an organic substrate-oxidizing bioanode and a methane-producing biocathode, by applying a constant anode potential. The methane production rate in the MEC decreased immediately when steel mill off-gas was tested, which likely inhibited anaerobic methanogens in the presence of oxygen. However, methanogenesis was still ongoing even though at lower methane production rates than with pure CO 2 . Subsequently, pure CO 2 was studied for methanation, and the cathodic biofilm successfully recovered from inhibition reaching a methane production rate of 10.8 L m −2 d −1 . Metagenomic analysis revealed Geobacter as the dominant genus forming the anodic organic substrate-oxidizing biofilms, whereas Methanobacterium was most abundant at the cathodic methane-producing biofilms.
Type of Medium:
Online Resource
ISSN:
2296-4185
DOI:
10.3389/fbioe.2022.972653
DOI:
10.3389/fbioe.2022.972653.s001
DOI:
10.3389/fbioe.2022.972653.s002
DOI:
10.3389/fbioe.2022.972653.s003
DOI:
10.3389/fbioe.2022.972653.s004
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2022
detail.hit.zdb_id:
2719493-0
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