Discussion
What provision a typical bioreactor possess to overcome the vortex formation during fermentation ?
Answer: A
The provision is baffles on the side walls.
An impeller spinning in an unbaffled vessel makes the whole broth rotate, forming a vortex: mixing and gas dispersion become poor and air is drawn down the shaft. Baffles, vertical metal strips usually four in number and about a tenth of the tank diameter wide, are fixed to the vessel wall to break up this swirl and convert it into top-to-bottom mixing.
A stuffing box seals the agitator shaft where it enters the vessel, a sparger introduces air at the bottom, and an oxygen probe measures dissolved oxygen. None of them prevents a vortex.
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