Open Access
Impact of Photosynthetically Active Radiation (PAR) on the cultivation of marine microalgae in open systems under tropical climatic conditions
Juan C. Zavala-Reyes
,
Regina M. González-Balderas
,
Regina M. González-Balderas
Escuela Nacional de Estudios Superiores Unidad Mérida, Universidad Nacional Autónoma de México
Abstract
Solar energy is the most cost-effective source for microalgae cultivation. Open-system biomass production enhances the sustainability of biofuel processes due to lower installation and operational costs. However, these systems are less efficient than closedsystems, as controlling light intensity and quality is challenging. This study evaluates the effect of photosynthetically active radiation (PAR) on marine microalgae cultivation in an open system under tropical climate conditions. The experiment was conducted in Mérida, Yucatán, using native microalgal strains to enhance adaptation. Throughout cultivation, PAR, nutrient concentrations, pH, and temperature were monitored to assess their interactions. Two trials were conducted in autumn (October–November) using three reactors exposed to different durations of solar radiation. Results indicate that the total daily PAR (30.6 mol/m²/day) exceeded the optimal growth range (20 mol/m²/day), leading to culture collapse within 14 days. Additionally, reactors exposed to longer sunlight exhibited greater temperature and pH fluctuations. No significant biomass accumulation or nutrient variation was observed. This study underscores the need for environmental monitoring in outdoor systems to optimize microalgae cultivation and better understand its applications and limitations.
Keywords
Photosynthetically active radiation,open pounds,microalgae
How to Cite
Barajas Cardona, V. I., Zavala Reyes, J. de la C., & González Balderas, R. de M. (2026). Impact of Photosynthetically Active Radiation (PAR) on the cultivation of marine microalgae in open systems under tropical climatic conditions. Renewable Energy, Biomass & Sustainability, 8(1), 1–7. https://doi.org/10.56845/rebs.v8i1.659
References
APHA, AWWA, & WPCF. (1992). Standard methods for the examination of water and wastewater (18 ed.). Washington, E.U.A.
Barceló-Villalobos, M., Fernandez-del Olmo, P., Guzmán, J. L., Fernández-Sevilla, J. M., & Acien Fernández, F. G. (2019). Evaluation of photosynthetic light integration by microalgae in a pilot-scale raceway reactor. Bioresource Technology, 280, 404–411. https://doi.org/10.1016/j.biortech.2019.02.032
Chisti, Y. (2007). Biodiesel from microalgae. Biotechnology Advances, 25(3), 294–306. https://doi.org/10.1016/j.biotechadv.2007.02.001
Dias, R. R., Lasta, P., Vendruscolo, R. G., Wagner, R., Zepka, L. Q., & Jacob-Lopes, E. (2021). Mapping the performance of photobioreactors for microalgae cultivation. Part II: Equatorial and tropical climate zone. Journal of Chemical Technology and Biotechnology, 96, 613–621. https://doi.org/10.1002/jctb.6574
Dolganyuk, V., Shkrabets, F., Azarkina, A., Zayats, Y., Shevchuk, O., Pashtetskiy, V., & Nagurskaya, N. (2020). Microalgae: A review of the basics of cultivation, use, and prospects for development. Energies, 13(19), 4927. https://doi.org/10.3390/en13194927