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How to optimise photosynthetic biogas upgrading: a perspective on system design and microalgae selection. | LitMetric

How to optimise photosynthetic biogas upgrading: a perspective on system design and microalgae selection.

Biotechnol Adv

Environmental Research Institute, MaREI Centre, University College Cork, Cork, T23 XE10, Ireland; School of Engineering, University College Cork, Cork, Ireland. Electronic address:

Published: December 2019

AI Article Synopsis

  • - Photosynthetic biogas upgrading using microalgae presents a sustainable alternative to traditional upgrading methods by enabling carbon capture and reuse in a circular economy.
  • - A proposed system combines an absorption column with photobioreactors, requiring careful microalgae species selection based on five criteria for optimal performance.
  • - Challenges for commercial implementation include land requirements, the need to reduce microalgae solution recirculation, and determining the best way to utilize microalgae, with Spirulina platensis emerging as the top candidate among other species.

Article Abstract

Photosynthetic biogas upgrading using microalgae provides a promising alternative to commercial upgrading processes as it allows for carbon capture and re-use, improving the sustainability of the process in a circular economy system. A two-step absorption column-photobioreactor system employing alkaline carbonate solution and flat plate photobioreactors is proposed. Together with process optimisation, the choice of microalgae species is vital to ensure continuous performance with optimal efficiency. In this paper, in addition to critically assessing the system design and operation conditions for optimisation, five criteria are selected for choosing optimal microalgae species for biogas upgrading. These include: ability for mixotrophic growth; high pH tolerance; external carbonic anhydrase activity; high CO tolerance; and ease of harvesting. Based on such criteria, five common microalgae species were identified as potential candidates. Of these, Spirulina platensis is deemed the most favourable species. An industrial perspective of the technology further reveals the significant challenges for successful commercial application of microalgal upgrading of biogas, including: a significant land footprint; need for decreasing microalgae solution recirculation rate; and selecting preferable microalgae utilisation pathway.

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Source
http://dx.doi.org/10.1016/j.biotechadv.2019.107444DOI Listing

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