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Which 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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