ABSTRACT
The need for mass cultivation of microalgae and the available technology for such cultivation are presented. In the design of photobioreactors used for mass cultivation of algae surface/volume ratio, light path, mixing frequency and light intensity are important and several designs of photo bioreactors are described. The possibility to adapt the light absorption capacities via genetic modification of microalgae is discussed. Milking the microalgae – a method to extract carotenoids while keeping cells alive making it possible to reuse stressed cells is recommended.
