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← ScienceWhich outcome occurs when increasing impeller speed beyond a turbine bioreactor's mass transfer optimum?
A)Reduced shear stress exposure occurs
B)Increased carbon dioxide stripping occurs
C)Oxygen transfer approaches a constant✓
D)Nutrient concentration gradients minimize
💡 Explanation
Oxygen transfer plateaus because beyond the optimum, back-mixing overwhelms the improved interfacial area driven by bubble shear, therefore further impeller speed increases won't increase the overall mass transfer coefficient, rather than continuing linearly.
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