sigma

Sigma Journal of Engineering and Natural Sciences

1304-7191 1304-7205

Yildiz Technical University

Clinical Chemistry

Klinik Kimya

The effect of photobioreactor height/diameter ratio on Chlorella variabilis microalgae growth and oil production efficiency

https://orcid.org/0000-0001-7879-3854

Altin

Necla

Department of Chemical Engineering, Kocaeli University, Kocaeli, 41001, Türkiye

https://orcid.org/0000-0002-6267-5631

Uyar

Başar

Department of Chemical Engineering, Kocaeli University, Kocaeli, 41001, Türkiye

08 01 2024

42 4 1194 1201 01 30 2023 04 12 2023

1983

Sigma Journal of Engineering and Natural Sciences

This study aims to reveal how height/diameter ratio of column photobioreactors affect the growth and lipid content of microalgae. For this purpose, Chlorella variabilis cells were grown in aerated column photobioreactors with height/diameter ratio of 1, 2, and 3 in defined (BG11) culture medium. Results obtained showed that maximum microalgae biomass con-centration, cell productivity, cell doubling time, and lipid productivity were found to increase as the height/diameter of photobioreactor increased. After 15 days of cultivation, the highest cell productivity (0.139 gdw/L.day), cell lipid content (21.1%) and lipid productivity (29.33 mg/L.day) were obtained in the photobioreactor with the highest height/diameter ratio (3), whereas the highest specific growth rate (0.045 h-1) was obtained in the photobioreactor with the smallest height/diameter ratio (1). These findings contribute to the knowledge on pho-tobioreactor design and pave way for more efficient use of column type photobioreactors in producing microalgae.

Chlorella Variabilis Microalgae Photobioreactor

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