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Syngas Biomethanation in a Semi-Continuous Reverse Membrane Bioreactor (RMBR)
University of Borås, Faculty of Textiles, Engineering and Business. (Biotechnology)
University of Borås, Faculty of Textiles, Engineering and Business. (Biotechnology)ORCID iD: 0000-0002-6886-4994
University of Borås, Faculty of Textiles, Engineering and Business. (Biotechnology)
2016 (English)In: Fermentation, MDPI, ISSN 2311-5637, Vol. 2, no 2, 8Article in journal (Refereed) Published
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

Syngas biomethanation is a potent bio-conversion route, utilizing microorganisms to assimilate intermediate gases to produce methane. However, since methanogens have a long doubling time, the reactor works best at a low dilution rate; otherwise, the cells can be washed out during the continuous fermentation process. In this study, the performance of a practical reverse membrane bioreactor (RMBR) with high cell density for rapid syngas biomethanation as well as a co-substrate of syngas and organic substances was examined in a long-term fermentation process of 154 days and compared with the reactors of the free cells (FCBR). The RMBR reached maximum capacities of H2, CO, and CO2 conversion of 7.0, 15.2, and 4.0 mmol/Lreactor.day, respectively, at the organic loading rate of 3.40 gCOD/L.day. The highest methane production rate from the RMBR was 186.0 mL/Lreactor.day on the 147th day, compared to the highest rate in the FCBR, 106.3 mL/Lreactor.day, on the 58th day. The RMBR had the ability to maintain a high methanation capacity by retaining the microbial cells, which were at a high risk for cell wash out. Consequently, the system was able to convert more syngas simultaneously with the organic compounds into methane compared to the FCBR.

Place, publisher, year, edition, pages
2016. Vol. 2, no 2, 8
Keyword [en]
syngas fermentation; methane production; semi-continuous process; reverse membrane bioreactor; co-substrate; cell retention
National Category
Engineering and Technology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-9817DOI: 10.3390/fermentation2020008OAI: oai:DiVA.org:hb-9817DiVA: diva2:924187
Available from: 2016-04-28 Created: 2016-04-28 Last updated: 2016-04-29Bibliographically approved

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Publisher's full texthttp://www.mdpi.com/2311-5637/2/2/8

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Youngsukkasem, SupansaChandolias, KonstantinosTaherzadeh, Mohammad
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CiteExportLink to record
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