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Microalgae can be produced using a wide variety of methods, ranging from closed fully controlled methods to less predictable methods in outdoor tanks. The terminologies used to describe the type of algal culture include indoor/oudoor, open/closed, axenic, batch, continuous and semi-continuous.
Open pond systems are shallow ponds in which algae are cultivated. Nutrients can be provided through runoff water from nearby land areas or by channeling the water from sewage/water treatment plants. Photobioreactors are different types of tanks or closed systems in which algae are cultivated. Algal cultures consist of a single or several specific strains optimized for producing the desired product. About ten microalgae are used for commercial applications. They are used as a whole without transformation (named whole algae in this report) or are used to produce extracts of interest (named extract in this report).
See also www.microalgae-market.com