A strain of Azotobacter vinelandii is cultured in a 15-m³ stirred fermenter for alginate production. Under current operating conditions, ka is 0.17 s¹. The solubility of oxygen in the broth is approximately 8 × 10^-3 kg m ^-3.

(a) The specific rate of oxygen uptake is 12.5 mmol g^-1h^-1. What is the maximum cell concentration supported by oxygen transfer in the fermenter.............in g/l

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