The drying process is one of the major limitations in the production of low-cost commod­ities (fuel, food, feed) and high-value products (p-carotene, polysaccharides). The process to be selected depends on the final product desired. The use of dehydration increases the shelf life of the biomass as well as the final product.

Several methods have been used to dry Chlorella, Scenedesmus, and Spirulina. Some of the most widely used methods include spray drying, drum drying, freeze drying, and sun drying (Richmond, 2004). Due to the high water content, the sun-drying method is not efficient to transform humid biomass into powder. The spray-drying method is not economically feasible for low-value products such as biofuels and protein (Mata et al., 2010).