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Light/dark cycle of microalgae cells in raceway ponds: Effects of paddlewheel rotational speeds and baffles
Zhijie Chen1, Xinru Zhang2, Zeyi Jiang2
1School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; School of Mechanical and Energy Engineering, Jimei University, Xiamen 361021, China.
Abstract:
The aim of this work was to study the light/dark (L/D) cycle in raceway ponds (RWPs) by the computational fluid dynamics (CFD) method via determining the hydrodynamics of culture media and cell trajectories. The effects of paddlewheel rotational speed and flow-deflector baffles installation on the L/D cycle were analyzed. The results indicated that, the L/D cycles of microalgae cells decreased with the increase of the paddlewheel rotational speeds, when the paddlewheel rotational speeds ranged from 5 to 12rpm. In addition, the installation of the flow-deflector baffles in RWPs can greatly increase the light time and the ratio of light time to L/D cycle for microalgae cells. The study provided an effective method to characterize the L/D cycles in RWPs, and may have important implications for designing the effective large-scale microalgae culture system.
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