Answer to Question #97042 in Chemistry for declasha

Question

A value of kLa = 30 h-1 has been determined for a fermenter at its maximum practical agitator
rotational speed and with aie being sparged at 0.5 L gas / L reactor volume-min. E. coli with
a qO2 of 10 mmol O2/g-dry wt-h are to be cultured. The critical dissolved oxygen concentration
is 0.2 mg/L. The solubility of oxygen from air in the fermentation broth is 7.3 mg/L at 30°C.
a) What is the maximum concentration of E. coli that can be sustained in this fermenter
under aerobic conditions?
b) What is the concentration could be maintained if pure oxygen was used to sparge the
reactor?

Answer 1

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