A chemostat with cell recycle is shown in the figure. The feed flow rate and culture volume are \( F = 75 \, \text{L h}^{-1} \) and \( V = 200 \, \text{L} \), respectively. The glucose concentration in the feed \( C_{S0} = 15 \, \text{g L}^{-1} \). Assume Monod kinetics with specific cell growth rate:
\[
\mu_g = \mu_m \frac{C_S}{K_S + C_S},
\]
where \( \mu_m = 0.25 \, \text{h}^{-1} \) and \( K_S = 1 \, \text{g L}^{-1} \). Assume maintenance and death rates to be zero, input feed to be sterile (\( C_{S0} = 0 \)) and steady-state operation. The glucose concentration in the recycle stream, \( C_{S1} \), in \( \text{g L}^{-1} \), rounded off to 1 decimal place, is:
\includegraphics[width=0.5\linewidth]{q62 CE.PNG}