Optimization of cultural conditions of Spirulina platensis in stirred photobioreactor

The optimum cultural conditions of Spirulina platensis Geitl including agitation rate, aeration rate and light intensity were selected in the stirred photobioreactor by means of the orthogonal experiment. The best cultural condition was agitation rate 120 r·min -1,aeration rate 80 L·h -1and light intensity 5 000 lx. The harvest yield (dry weight) was 1.922 g·L -1 under the best cultural condition. The optimum cultural conditions were obtained according to the regression model, namely light intensity 5 000 lx, aeration rate 150 L·h -1 and agitation rate 111.70 r·min -1 and forecast value of harvest yield (dry weight) reached to 2.293 g·L -1. In addition, the inoculation rate of 10% is suitable for the growth of S. platensis in the stirred photobioreator.