Abstract
With increasing concerns regarding energy and environment, algae biofuel is generating considerable interest around the world. Nevertheless, the harvesting step required before downstream biomass processing is a major bottleneck. Commonly employed methods include addition of chemicals or use of mechanical equipment that increase dramatically the biofuel production cost. This review deals with naturally occurring processes that can help offset those costs by causing microalgae flocculation. Interaction theories are briefly reviewed. In addition, operational parameters such as pH, irradiance, nutrients, dissolved oxygen, and temperature effect on microalgae flocculation are evaluated. Finally, microalgae flocculation is also considered from an ecological point of view by taking advantage of their interaction with other microorganisms.
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