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Sugar or sunlight?
That’s one of the fundamental questions for companies trying to transform algae into transportation fuel or dietary supplements. Solazyme says it will grow algae through fermentation–for instance, feeding the algae sugars in a heated, sealed environment.
“We’re not growing it photosynthetically. We put it in stainless steel tanks similar to what you see in a brew pub,” said Solazyme President Harrison Dillon.
By contrast, GreenFuel Technologies and LiveFuels will exploit the sun to grow the single-celled creatures. And here there is a divide, too. GreenFuel grows its algae in sealed, transparent tubes it calls bioreactors. LiveFuels, by contrast, is setting up an open pond near the Salton Sea in Southern California.