A fermentation system has a KLa of 3 s-1 and a C0* of 5 ppm of O2. If the bulk liquid is saturated with oxygen then the oxygen transfer rate will be equal to
Options
A. zero
B. 3 mg.l-1.s-1
C. 5 mg.l-1.s-1
D. 15 mg.l-1.s-1
Correct Answer
zero
Agitation and Aeration problems
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1. In aerobic microorganisms cultures radial flow impellers are used because
Options
A. they provide energy efficient high turbulent mixing conditions
B. they provide low shear mixing conditions
C. they provide high shear mixing conditions
D. they ensure that bubble size is maximized leading to high oxygen transfer rates
Correct Answer: using specially designed axial flow impellers
3. A fermentation system has a KLa of 3 s-1 and a C0* of 5 ppm of O2. If the bulk liquid is completely depleted of oxygen, then the oxygen transfer rate will be equal to
5. For aerated mixing vessels in an aqueous solution, the mass transfer coefficient (kL) co-relating power consumption (Pm) and fermenter volume (V) can be expressed as