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Biological syngas methanation via immobilized methanogenic archaea on biochar
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-5014-3275
Ruhr-University, Bochum, Germany.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-3485-5440
Bochum University of Applied Sciences, Bochum, Germany.
2017 (English)In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 105, 823-829 p.Article in journal (Refereed) Published
Abstract [en]

Syngas containing H2, CO, CO2 and CH4 produced by thermalprocesses such as gasification or pyrolysis is typically converted to methane via thermochemical methanation. This process is characterized by a high heat demand utilizing a sensitive chemical catalyst at increased pressure conditions. Alternatively, methanogenic archaea could be exploited as a naturalcatalyst in a biological methanation process with a lower energy demand. However, the mass transfer between the gas phase and the microbial cell is a major challenge for efficient conversion of the syngas components. Therefore, in this work methanogenic archaeafrom anaerobic digestion residueswere successfully immobilized on biochar particles obtained from green waste pyrolysis with two distinct particle sizes (0.25-1 mm and 1-2 mm). After incubation of the inoculated particles with an artificial syngas mixture CH4 was formed within the first 24 hours, while H2, CO2 and CO simultaneously declined. However, the particle size had no influence on the CH4 yield, content and conversion efficiency. According to the maximum theoretical conversion rate of H2 with CO2 and CO to CH4 only about 50% of the syngas components were converted to methane. These results suggest that CO was rather utilized by the methanogens involved for acetate/formate formation than for methanogenesis due to slight inhibition of the latter processby CO present in the syngas. The impact of CO inhibition during biological syngas methanation needs to be further evaluated for a continuous application of the process. However, a proof of concept for this process using inoculated biochar particles could be shown within the study presented here.

Place, publisher, year, edition, pages
2017. Vol. 105, 823-829 p.
Keyword [en]
biogas, syngas, methanation, biochar, anaerobic digestion, pyrolysias
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-34275DOI: 10.1016/j.egypro.2017.03.396Scopus ID: 2-s2.0-85020711595OAI: oai:DiVA.org:mdh-34275DiVA: diva2:1057393
Conference
8th International Conference on Applied Energy, ICAE 2016; Beijing; China; 8 October 2016 through 11 October 2016
Available from: 2016-12-18 Created: 2016-12-18 Last updated: 2017-06-29Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • modern-language-association-8th-edition
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