Journal
CHEMICAL ENGINEERING JOURNAL
Volume 354, Issue -, Pages 304-313Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.06.019
Keywords
Photobioreactor; Multiscale; Microbubble; Mass transfer; CFD
Categories
Funding
- SARI youth fund
- National Natural Science Foundation of China [81400658]
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Based on experimental and computational fluid dynamics simulations, the scale effect between the bubbles and the algae for different sizes in the culture process were investigated in a photobioreactor column under single and combined gas intake conditions, including factors such as the bubble distribution, gas holdup and mass transfer coefficient of different scale bubbles (500 mu m microbubbles and 5 mm bubbles). In general, microbubbles could improve mass transfer and photo bio-reaction. For microalgae cultures with large particle sizes or high biomass concentration, the mixing ability of microbubbles was weakened, and therefore, the culture efficiency decreased. However, this can be improved by using millimeter bubbles with the strong turbulent characteristic. Therefore, a multiscale bubble combination intake method was proposed. This method can significantly strengthen both the multiphase mixture and mass transfer processes and was beneficial to improving the growth efficiency of Chlorella.
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