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FEED BATCH FERMENTOR
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A stream of reactant A (CAo = 4, CBo = 0, CCo = 0) is to be decomposed by the following microbial fermentation

(1,2) Calculate C, which can be obtained in a single mixed flow reactor of size Vm = 1 for a feed rate of

(1)  v = 1/4

(2)  v = 4

Also calculate CA which can be obtained with two connected mixed flow reactors, each of volume V = 2, for a feed rate of

(3)  v = 3

(4) v = 2

(5) A culture of E. coli was grown on lactose in a mixed flow reactor (V = 2 litre) using various flow rates of a CAo = 200 mg lactose/litre feed. The following results were obtained:

 v, litre/hr CA, mg/litre Cell Concentration, Arbitrary 0.3 6 16.6 0.8 12 16 1.4 48 14 2.0 110 8

Find a rate equation to represent this growth.

(6) How curious-two different flow rates of CAo = 600 mol/m3 feed to a 1.5 m3 mixed flow reactor produces the same 100 gm/hr of yeast cells in the exit stream, namely

·         at 1 m3/hr of feed for which we find CA = 200 mol/ m3

·         at 1.5 m3/hr of feed for which we find CA = 400 mol/ m3

Yeast formation can be represented by substrate limiting Monod kinetics. Find

a)      the fractional yield of yeast,

b)     the kinetic equation for yeast formation,

c)      the flow rate for maximum yeast production,

d)     the maximum production rate of yeast.

(7,8) E. coli lives and grows on mannitol with the following kinetics:

Find the outlet concentration of cells from the reactor when 1.5 m3/hr of mannitol solution (CAo = 6.3 gm/m3) is fed directly to a mixed flow reactor of volume

(7) Vm = 4 m3

(8) Vm = 2 m3

How can the production of cells be improved from the reactor for

(9) problem (7)?

(10) problem (8)?

by bypass or recycle of fluid

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