Overcoming Shear Stress of Microalgae Cultures in Sparged Photobioreactors

Barbosa, M.J. and Hadiyanto, H. and Wijffels, R.H. (2004) Overcoming Shear Stress of Microalgae Cultures in Sparged Photobioreactors. Biotechnology and Bioengineering, 85 . pp. 78-85.

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Official URL: http://dx.doi.org/10.1002/bit.10862


In the present work we identified and quantified the effect of hydrodynamic stress on two different microalgae strains, Dunaliella tertiolecta and D. salina, cultivated in bench-scale bubble columns. The cell death rate constant increased with increasing gas-entrance velocity at the sparger. Dunaliella salina was slightly more sensitive than D. tertiolecta. The critical gas-entrance velocities were f50 and 30 m s–1 for D. tertiolecta and D. salina, respectively. The effects of gas-flow rate, culture height, and nozzle diameter on the death rate constant were also studied. From these results it was concluded that bubble rising and bubble bursting are not responsible for cell death. Regarding nozzle diameter, small nozzles were more detrimental to cells. The bubble formation at the sparger was found to be the main event leading to cell death.

Item Type:Article
Subjects:S Agriculture > S Agriculture (General)
Q Science > QK Botany
S Agriculture > SB Plant culture
Divisions:Faculty of Engineering > Department of Chemical Engineering
Faculty of Engineering > Department of Chemical Engineering
ID Code:161
Deposited On:09 May 2009 10:09
Last Modified:09 May 2009 10:09

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