Exercise: Fermentation Reactors

Questions for: Fermentation Reactors

In a fluidized bed reactor, the function of the disengagement zone is to
A:
reduce loss of particles from the reactor
B:
reduce the velocity of the particles near the surface of the reactor
C:
reduce foaming problems
D:
all of the above
Answer: D
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A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic
A:
will increase until the culture washes out
B:
will decrease after washout
C:
will be zero
D:
will be infinite
Answer: C
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A fed-batch reactor initially contains 2 litre of medium. If it was fed at 1 litre per hour, then after 10 hours, the volume of the reactor will be
A:
1 litre
B:
2 litre
C:
3 litre
D:
13 litre
Answer: B
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Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is
A:
time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
B:
total amount in rector = rate of addition to reactor - rate of removal + rate of formation
C:
rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation
D:
none of the above
Answer: A
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On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters μm = 0.3 h-1, Ks =0.05 g.l-1 and Yxs = 0.3 g.g-1 When this organism is grown in a 2 litre continuous on a medium containing 10 g.l-1 of glucose added at 1 l.h-1, the steady state concentration of biomass in the reactor will be
A:
0 g.l-1
B:
0.4 g.l-1
C:
0.5 g.l-1
D:
10 g.l-1
Answer: A
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