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One of the questions regarding algae fuel is the best method to harvest algae. It should be noted that algae harvesting could form a significant part of the total cost of producing algae fuel.

A number of methods are discussed – sedimentation, filtering, centrifugation, coagulation / flocculation & froth flotation. It is difficult to say which is the best, but different companies have been having success with differing methods so it is indeed a tough call.

On filtration, some of the questions are what type of filters should be used if indeed one is looking at filtration as the method to harvest. On this, based on the case studies I have seen so far, I think the most common filters that have been used are the drum filters. These types of filters are rather standard fare and have been used in industries for many years.

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