Recommended turbulent energy dissipation rate for biomass and lipid production of Scenedesmus obliquus in an aerated photosynthetic culture system
2020
An, Mei | Yang, Songqi | Wu, Haiming | Luo, Guanghong | Li, Ming
Effects of turbulent energy dissipation rate (increased from 1.28 × 10⁻⁶ to 1.67 × 10⁻⁵ m² s⁻³) on Scenedesmus obliquus biomass and lipid accumulation at different aeration rates (0.3, 0.6, 0.9, 1.2, and 1.5 L min⁻¹) were investigated. The turbulent energy dissipation rate was calculated by CFD model simulation. When the turbulent energy dissipation rate increased to 7.30 × 10⁻⁶ m² s⁻³, the biomass and lipid productivity increased gradually, and finally reached their maximum values of 1.11 × 10⁷ cells mL⁻¹ and 16.0 mg L⁻¹ day⁻¹, respectively. When it exceeded 7.30 × 10⁻⁶ m² s⁻³, the biomass and lipid productivity showed a decreasing trend. Therefore, the most favorable turbulent energy dissipation rate for S. obliquus growth and lipid accumulation was 7.30 × 10⁻⁶ m² s⁻³.
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