Microalgae growth in ultra-thin steady-state continuous photobioreactors: assessing self-shading effects
Open accessAbstract
To disclose the net effect of light on microalgal growth in photobioreactors, self-shading and mixing-induced light–dark cycles must be minimized and discerned from the transient phenomena of acclimation. In this work, we performed experiments of continuous microalgal cultivation in small-scale photobioreactors with different thicknesses (from 2 to 35 mm): working at a steady state allowed us to describe the effect of light after acclimation, while the geometry of the reactor was adjusted to find the threshold light path that can discriminate different phenomena. Experiments showed an increased inhibition under smaller culture light paths, suggesting a strong shading effect at thicknesses higher than 8 mm where mixing-induced light–dark cycles may occur. A Haldane-like model was applied and kinetic parameters retrieved, showing possible issues in the scalability of experimental results at different light paths if mixing-induced light–dark cycles are not considered. To further highlight the influence of mixing cycles, we proposed an analogy between small-scale operations with continuous light and PBR operations with pulsed light, with the computation of characteristic parameters from pulsed-light microalgae growth mathematical modeling.
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Illumination intensity is attenuated before it reaches the microalgae cells due to absorption and self-shading effects caused by dense cultures inside the bioreactor.
“The illumination intensity is attenuated before it reaches the microalgae cells due to absorption and self-shading effects caused by dense cultures inside the bioreactor [161].”
From Multi-Sensing Monitoring of the Microalgae Biomass Cultivation Systems for Biofuels and Added Value Products Synthesis—Challenges and Opportunities (2025) · cites this paper as [161]
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- Authors
- Saccardo, A., Bezzo, F., & Sforza, E.
- Affiliations
- University of Padua (IT)
- Corresponding author
- Sforza, Eleonora
- Venue
- Frontiers in Bioengineering and Biotechnology
- Publisher
- Frontiers Media SA
- Published
- 2022-08-11
- Volume
- 10
- Pages
- 977429-977429
- ISSN
- 2296-4185 (ISSN-L)
- PMC
- PMC9402969
- OpenAlex
- W4290993283
- Cited by
- 54
- References
- 31
- Citations by year
- 2026: 24 · 2025: 18 · 2024: 6 · 2023: 5 · 2022: 1
- FWCI
- 1.35
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Frontiers in Bioengineering and Biotechnology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Padua Research Archive (University of Padova) (submittedVersion, 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
- Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
- Keywords
- microalgae growth, self-shading, light path, Haldane model, kinetic parameter estimation, scalability, pulsed light
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