Design of Fermentation Processes
Figure 9.8. Transient in a constant-Z), stirred tank continuous reactor following a change in substrate
feed concentration from
4 g L'1. Kinetic parameters as in Example 9.12, and
0.4 h'1. A: z =
and 4 g L'1.
substrate concentration, g L"1.
Figure 9.8 A and B shows the transients of
z ~ x / x0
for the same set of kinetic
parameters as were used in figure 9.7. D = 0.4 h
and ^ = 4 g L 1. It is noted that
returns to its
g L l) as is the case whenever
is a function of
constant during the experiment. In the beginning there is an overshoot in
sf> s ) .
not enough biomass available to cope with the larger influx of substrate, but eventually
increases to its final valuer* =
f ), i.e
The curves on figure 9.8 were simulated using Matlab to solve
+ ( / -
a ~ fK^z
+ ( / -
) exp(-Dr) +
with z = 1 for / = 0 ; / = S/ /
= 0.4 h '1.
Transients caused by pulse addition of substrate.