This is a view of the agitators inside of a 12,000 liter fermenter. There are three 24 inch diameter turbine type Rushton impellers, capable of turning from 10 to 500 RPM (14, 45, 68).
In the background can be seen the 100 hp dc variable speed drive motor for the 12,000 liter fermenter. Mounted above it is an air blower with ducting to direct air through the motor to keep it cool during agitation without aeration, such as during sterilization. In the foreground is the right angle gearbox, and rising up form it is a 6 inch diameter drive shaft that passes through the bottom of the vessel. It rises inside to 75% the height of the vessel and has three 24 inch diameter impellers to provide agitation (14, 45, 68, 73).
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