Cited by 31Algal biology and biofuel productionFluid Dynamics and MixingMicrobial Metabolic Engineering and Bioproduction

Tackling old challenges in microalgal biotechnology: the role of photobioreactors to advance the technology readiness level

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Deprá, Mariany Costa, Dias, Rosangela Rodrigues, Zepka, Leila Queiroz, Jacob-Lopes, Eduardo·2024·Processes

Abstract

Microalgae biotechnology has taken the world by storm. However, despite its great potential promise, it still cannot be considered a fully consolidated technology due to a crucial challenge: the low rates of biomass productivity. To overcome this hurdle, photobioreactors have been developed as an innovative solution, promising to increase the efficiency of microalgae cultures by providing optimized conditions. However, the results obtained with these systems do not always meet initial expectations, and their large-scale implementation faces complex technical challenges. In light of this, the present review addresses the main aspects related to the design and engineering of photobioreactors, highlighting their potentialities and limitations in overcoming the critical challenges of microalgal biotechnology. Furthermore, we discuss the current technological readiness level and the commercial readiness index of microalgae-based bioproducts from the perspective of industrial-scale production.

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Crossref · 10.3390/pr13010051

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114 of 115 references verified0 citation errors · 1 not checkable

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  • Differences between laboratory and industrial-scale microalgae processes are largely attributed to the sensitivity of microalgae performance to critical operational parameters.

    “In fact, the differences observed between laboratory and industrial-scale processes are largely attributed to the sensitivity of microalgae performance to critical operational parameters.”

    From Microalgae biotechnology and its role in sustainable and healthy food design (2025) · cites this paper as Deprá et al., 2024

    Section 2 says process control decreases as cultivation moves to larger volumes, and Section 4 says control of temperature, pH, light, and nutrients maintains productivity. Together these support the importance of operational parameters, but the paper attributes the scale-up loss of control primarily to insufficient understanding of expansion requirements; it does not specifically say that laboratory–industrial differences are largely caused by microalgae’s sensitivity to those parameters. The indexed passages provide no page numbers. (LLM, conf=0.78)

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  • Polycarbonate combines good light transmittance, high mechanical strength, lower susceptibility to biofouling, and a favorable cost-benefit ratio for photobioreactor construction.

    “Polycarbonate, on the other hand, represents a promising alternative, as it combines good light transmittance, high mechanical strength, and lower susceptibility to biofouling, while also offering a more favorable cost–benefit ratio for photobioreactor construction (Deprá et al., 2024).”

    From Microalgae biotechnology and its role in sustainable and healthy food design (2025) · cites this paper as Deprá et al., 2024

    Section 2 reports that polycarbonate has 85–90% light transmittance, greater impact resistance, and higher resistance to biofouling than the other materials discussed. The paper discusses photobioreactor installation costs in Section 3, but does not establish that polycarbonate itself offers a more favorable cost–benefit ratio. (LLM, conf=0.88)

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  • The majority of these investigations have been conducted at the laboratory scale.

    “However, it is important to recognize that the majority of these investigations have been conducted at the laboratory scale.”

    From Microalgae biotechnology and its role in sustainable and healthy food design (2025) · cites this paper as Deprá et al., 2024

    Section 2, “Biomass Production—The Death Valley of Microalgal Biotechnology” (page not provided), says laboratory-scale work involves tests for process optimization before parameters are transferred to larger scales. It does not say that a majority of investigations have been conducted at laboratory scale. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Detailed techno-economic assessments are required before full-scale implementation, as changes in cell characteristics such as morphology or cell wall composition can impact downstream processing costs, regulatory compliance, and genetic stability.

    “Detailed techno-economic assessments are required before full-scale implementation, as changes in cell characteristics—such as morphology or cell wall composition—can impact downstream processing costs, regulatory compliance, and genetic stability.”

    From Microalgae biotechnology and its role in sustainable and healthy food design (2025) · cites this paper as Deprá et al., 2024

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  • Variations in operational parameters lead to substantial differences in growth rates, biomass yield, and metabolite accumulation, widening the performance gap between laboratory and industrial operations.

    “Consequently, variations in these parameters lead to substantial differences in growth rates, biomass yield, and metabolite accumulation, thereby widening the performance gap between laboratory and industrial operations”

    From Microalgae biotechnology and its role in sustainable and healthy food design (2025) · cites this paper as Deprá et al., 2024

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Cites

1 retracted

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Research works printed but not linked: 2

  1. Jacob-Lopes, E., Zepka, L.Q., Severo, I.A., Maroneze, M.M., Eds.; Woodhead Publishing: Cambridge, UK; Elsevier Science Ltd.: Amsterdam, The Netherlands, 2022; Volume 1, pp. 1019-1035.
  2. Jacob-Lopes, E., Maroneze, M.M., Queiroz, M.I., Zepka, L.Q., Eds.; Academic Press: London, UK, 2020; Volume 1, pp. 709-735. 114. Corbion-AlgaVia™ Culinary Algae Oils. Available online: https://www.corbion.com/products/algae-ingredients-products/ algavia (accessed on 17 December 2024). 115. ExxonMobil. Available online: https://corporate.exxonmobil.com/what-we-do/transforming-transportation/advanced- biofuels/advanced-biofuels-and-algae-research#Algaeforbiofuelsproduction (accessed on 17 December 2024). 116. Algenol. Available online: https://www.algenol.com/ (accessed on 17 December 2024).

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Authors
Deprá, M. C., Dias, R. R., Zepka, L. Q., & Jacob-Lopes, E.
Affiliations
  • Universidade Federal de Santa Maria (BR)
  • Bioprocess Intensification Group, Federal University of Santa Maria, UFSM, Roraima Avenue 1000, Santa Maria 97105-900, RS, Brazil
Corresponding author
Deprá, Mariany Costa
Venue
Processes
Publisher
MDPI AG
Published
2024-12-29
Volume
13
Issue
1
Pages
51
ISSN
2227-9717 (ISSN-L)
OpenAlex
W4405928337
Cited by
31
References
113
Citations by year
2026: 19 · 2025: 12
FWCI
2.07
Type
journal article
Language
en
Open access
Locations
Processes (publishedVersion, cc-by)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Physical Sciences › Engineering › Biomedical Engineering › Fluid Dynamics and Mixing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
Keywords
photobioreactors, microalgal biotechnology, microalgae productivity, technology readiness level

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