Abstract
The influence of several variables on the growth rate of the green algae Chlorella pyrenoidosa Chick has been studied. The effects of changes in culture medium, temperature and light are reported. For the production of algae biomass, three different types of closed-cultured systems or bioreactors were used (flexible sheath, translucent tubes and rigid panels, all of them in PVC) under different environmental conditions (chamber, greenhouse and outdoor culture). The results show that the growth of Chlorella is influenced by water quality. However, the algae have a good resistance to temperature variations and they can grow even under low light intensity conditions. Comparing the performance of different bioreactors, it was shown that the outdoor rigid panel system with integrated temperature regulation resulted in a biomass production similar to that for cultures grown in outdoor open ponds in regions with better climatic conditions.
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