The biomass reaction is carried out in a 6 dm 3 chemostat with a heat exchanger. The volumetric flow rate is I dm 3 /h and the entering substrate concentration and temperature are 100 g/dm 3 and 280...

The biomass reaction

is carried out in a 6 dm³
chemostat with a heat exchanger.

The volumetric flow rate is I dm³/h and the entering substrate concentration and temperature are 100 g/dm³
and 280 K, respectively. The temperature dependence of the growth rate follows that given by Aibe et al., Equation (9-63)

(a) Plot G(D and R(D for both adiabatic and non-adiabatic operation assuming a very large coolant rate (i.e., Q = UA (T_a- D with A = 1.1 m²
and T. = 290 K).

(b) What is the heat exchanger area that should be used to maximize the exiting cell concentration for an entering temperature of 290 K? Cooling water is available at 290 K and up to a maximum flow rate of I kg/min.

(c) Identify any multiple steady states and discuss them in light of what you learned in this chapter. [Hint: Plot T_s
vs. T₀
from Part (a).]

(d) Vary T₀, m_e, and Ta and describe what you find.