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In-situ biological biogas upgrading using upflow anaerobic polyfoam bioreactor (UAPB): operational and biological aspects.
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  • Isam Sabbah,
  • Katie Baransi-Karkaby,
  • Keren Yanuka-Golub,
  • Mahdi Hassanin,
  • Nedal Massalha
Isam Sabbah
Galilee Society

Corresponding Author:isabbah@gal-soc.org

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Katie Baransi-Karkaby
Galilee Society
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Keren Yanuka-Golub
Galilee Society
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Mahdi Hassanin
Galilee Society
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Nedal Massalha
Galilee Society
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Abstract

A high rate upflow anaerobic polyfoam-based bioreactor (UAPB) was developed for lab-scale in-situ biogas upgrading. The use of a porous diffuser, alongside high gas recirculation, led to a higher H 2 liquid mass transfer, and subsequently to a better uptake for high CH 4 content (up to 90%). Although our attempts to optimize both operational parameters (H 2 flow rate and gas recirculation ratio) were not successful, at a very high recirculation ratio (32) and flow rate (54 mL/h), a significant improvement of the hydrogen consumption was achieved. These operational conditions have in turn driven the methanogenic community towards the dominance of Methanosaetaceae, which out-competed Methanosarcinaceae. Nevertheless, a highly stable methane production rate was observed despite the methanogenic turnover. During the different applied operational conditions, the bacterial community was especially impacted, resulting in substantial shifts of taxonomic groups. Notably, Aeromonadaceae was the only bacterial group positively correlated with increasing hydrogen consumption rates. The capacity of Aeromonadaceae to extracellularly donate electrons suggests that direct interspecies electron transfer (DIET) enhanced biogas upgrading. Overall, the proposed innovative biological in-situ biogas upgrading technology using the UAPB configuration shows promising results for stable, simple and effective biological biogas upgrading.
08 Nov 2023Submitted to Biotechnology and Bioengineering
09 Nov 2023Submission Checks Completed
09 Nov 2023Assigned to Editor
09 Nov 2023Review(s) Completed, Editorial Evaluation Pending
18 May 2024Submission Checks Completed
18 May 2024Assigned to Editor
18 May 2024Review(s) Completed, Editorial Evaluation Pending
28 May 2024Reviewer(s) Assigned
03 Jun 20242nd Revision Received
05 Jun 2024Submission Checks Completed
05 Jun 2024Assigned to Editor
05 Jun 2024Review(s) Completed, Editorial Evaluation Pending
10 Jul 2024Editorial Decision: Accept