Page 430 - Elements of Chemical Reaction Engineering Ebook

Sec. 7.5 Bioreactors 401

Air Vent

-

Spirillla
(spirals)

Figure 7-15 Bioreactor.
The Icorresponding substrate balance is

rate of rate of
rate substrat! + rate sub;; of
of
leaving, generation,
g/s '7-118)

In most systems the entering microorganism concentration Cc, is zero.
For a batch system the mass balances develop are as follows:

Cell

dCc
Batch V - rpV- rdV
=
dt
Dividing by the reactor volume V gives
('7-1 19)

Substrate
The irate of disappearance of substrate, -r-, results from substrate used for cell
growth and substrate used for cell maintenance,