Methods for the separation of hydraulic retention time and solids retention time in the application of photosynthetic microorganisms in photobioreactors: a review

Methods for the separation of hydraulic retention time and solids retention time in the application of photosynthetic microorganisms in photobioreactors: a review

Photosynthetic microorganisms have a wide range of biotechnical applications, through the application of their versatile metabolisms. However, their use in industry has been extremely limited to date, partially because of the additional complexities associated with their cultivation in comparison to...

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Bibliographic Details
Published in:World journal of microbiology & biotechnology Vol. 40; no. 3; p. 100
Main Authors: Keet, Grant, Du Toit, J. P., Pott, Robert William McClelland
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01-03-2024
Springer Nature B.V
Subjects:
Applied Microbiology
Biocatalysts
Biochemistry
Biomass
Biomedical and Life Sciences
Bioreactors
Biotechnology
Environmental Engineering/Biotechnology
Flow system
Hydraulic retention time
Life Sciences
Microbiology
Microorganisms
Photobioreactors
Photosynthesis
Retention
Retention time
Review
Reviews
Separation
Photosynthetic microorganisms
Solid retention time
Biotechnical applications
Hydraulic retention time
Immobilisation
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Summary:Photosynthetic microorganisms have a wide range of biotechnical applications, through the application of their versatile metabolisms. However, their use in industry has been extremely limited to date, partially because of the additional complexities associated with their cultivation in comparison to other organisms. Strategies and developments in photobioreactors (PBRs) designed for their culture and applications are needed to drive the field forward. One particular area which bears examination is the use of strategies to separate solid- and hydraulic-residence times (SRT and HRT), to facilitate flow-through systems and continuous processing. The aim of this review is to discuss the various types of PBRs and methods which are currently demonstrated in the literature and industry, with a focus on the separation of HRT and SRT. The use of an efficient method of biomass retention in a PBR may be advantageous as it unlocks the option for continuous operation, which may improve efficiency, and improve economic feasibility of large-scale implementation of photosynthetic biocatalysts, especially where biomass is not the primary product. Due to the underexplored nature of the separation of HRT and SRT in reactors using photosynthetic microorganisms, limited literature is available regarding their performance, efficiencies, and potential issues. This review first introduces an overview into photosynthetic microorganisms cultivated and commonly exploited for use in biotechnological applications, with reference to bioreactor considerations specific to each organism. Following this, the existing technologies used for the separation of HRT and SRT in PBRs are explored. The respective advantages and disadvantages are discussed for each PBR design, which may inform an interested bioprocess engineer.
Bibliography:ObjectType-Article-2
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ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-024-03909-z