SYSTEM AND METHOD FOR MICRO-AERATION BASED FERMENTATION
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United States of America Patent
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Dec 4, 2013
filing date -
Jun 4, 2012
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Abstract
A method and apparatus for micro-aeration of large scale fermentation systems is provided. The micro-aeration system includes a fermentation reactor, a sparging apparatus, and a micro-aeration gas mixture delivered to the fermentation reactor via the sparging apparatus. The micro-aeration gas mixture is a very low oxygen concentration mixture comprising: (i) an oxygen containing gas; and (ii) an inert carrier gas or reactive carrier gas that is recycled through the fermentation reactor. The gas mixture is introduced to the fermentation reactor at a minimum superficial velocity of about 0.04 m/sec to produce a uniform dispersion of the oxygen throughout the fermentation broth while concurrently mixing the entire fermentation broth. For a reactive gas consuming fermentation process, the amount of reactive carrier gas included as part of the gas mixture exceeds the reaction stoichiometric requirements in order to provide sufficient dispersion and agitation of the broth.
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