Centrifugation

Centrifugation is the preferred method for harvesting algal cells [2, 20, 21]. However, centrifugation can be extremely energy intensive, especially when considering large volumes. Centrifugation involves the application of centripetal acceleration to sepa­rate the algal culture into regions of greater and lesser densities. Once separated, the algae can be removed from the culture by simply decanting the supernatant spent medium. Filters can also be used during centrifugation to enhance the separation of the supernatant from the medium. Mohn [20] compared the appropriateness of dif­ferent makes and brands of centrifuges for dewatering of microalgae. Key parame­ters included in the study consisted of the concentration factor produced, energy consumption, relative cost, operation mode and reliability.