Difference between simple stirred tank bioreactor and sparged stirred tank bioreactor

Dear Student,
A stirred tank bioreactor is cylindrical with a curved base to facilitate the mixing of the contents in reactor. Stirrer plays a role in mixing and equal oxygen availability throughout, So the difference is - Bubbles increases the surface area in sparged type hence increases transfer of oxygen whereas in simple type there is no presence of oxygen bubbles. 
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Simple stirred bioreactor has less surface area , but sparged stirred bioreactor has larger surface area . Formation of O 2 bubbles does not takes place in case of simple stirred bioreactor whereas 0 2 bubbles are formed in sparged stirred tank bioreactor -- BEST OF LUCK --
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