Kinetic Analysis of the Growth of Spirulina sp. on Continuous Culture :

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Abstract

Continuous cultivation of Spitulina sp. was carried our under limited light conditions at 30℃ in the pH range of 9.2 to 9.7. Kinetic analysis was done using the relationship between the extinction of luminous flux in the culture solution and growth rate of algal cells. Luminous flux which was extinguished in the culture solution could be calculated from the luminous transmittance on the surfaces of the culture vessel, and the extinction rate of luminous flux per cell concentration, designated as specific extinction rate G(x, L), could be expressed by an equation where the cell concentration only was variable. When the dilution rate of the culture solution was changed under fixed incident luminous flux, G(x, L)was in close proportion to the dilution rate D(x, L). Moreover, the relationship between incident luminous flux L and G(x, L)could be expressed by the following equation : [numerical formula] where k_1=0.003 l/h, k_2=0.045 g/l・h and km=287lm. Except for cell concentrations of less than 0.15 g/l under incident luminous flux of 360 lm, the dilution rate calculated from this equation was in good agreement with the value set as the dilution rate for continuous culture. Furthermore, this formula is in good agreement with the equation for the growth rate of algal cells cultured under illumination with parallel light rays, where the luminous intensity is variable, when the cell concentration is constant and the dilution rate is greater than the k_1 value.

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