Productivity and photosynthetic efficiency ofSpirulina platensis as affected by light intensity, algal density and rate of mixing in a flat plate phot

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Productivity and photosynthetic efficiency ofSpirulina platensis as affected by light intensity, algal density and rate of mixing in a flat plate photobioreactor

Journal - Journal of Applied Phycology
Publisher - Springer Netherlands
Issue - Volume 8, Number 2 / March, 1996
DOI - 10.1007/BF02186317
Pages - 139-145
SpringerLink Date - Tuesday, September 20, 2005

Productivity and photosynthetic efficiency ofSpirulina platensis as affected by light intensity, algal density and rate of mixing in a flat plate photobioreactor
Hu Qiang1 and Amos Richmond1
(1)
Microalgal Biotechnology Laboratory, The Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev Sede Boker Campus, 84990, Israel
Received: 14 February 1996 Revised: 20 May 1996 Accepted: 22 May 1996
Abstract The effect of the rate of mixing on productivity of algal mass in relation to photon flux density and algal concentration was quantitatively evaluated in cultures ofSpirulina platensis grown in a newly designed flat-plate photobioreactor. Special emphasis was placed on elucidating the principles underlying efficient utilization of high photon flux density for maximal productivity of algal-mass. Whereas the rate of mixing exerted little influence on productivity and photosynthetic efficiency in cultures of relatively low algal density, its effect became ever more significant as algal concentration was increased. Maximal mixing-enhanced cell concentrations and productivity of biomass were obtained at the highest light intensity used. At each level of incident light intensity, maximum productivity and photosynthetic efficiency could be achieved only when algal concentration and mixing rates were optimized. The higher the intensity of the light source, the higher became the optimal culture density, highest algal concentrations and productivity of biomass being obtained at the highest light intensity used. The rate of mixing required careful optimization: when too low, maximal productivity resulting from the most efficient utilization of light could not be obtained. Too high a rate of mixing resulted in cell damage and reduced output rate.

Key words Spirulina platensis - mixing rate - light intensity - algal density - photobioreactor - productivity - photosynthetic efficiency

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