Page 451 - Elements of Chemical Reaction Engineering Ebook

422 Nonelementary Reaction Kinetics Chap. 7

(a) Determine the Monod growth parameters pmax and Ks.
(b) Estimate the stoichiometric coefficients, Ycls and Yslc.
W-30B The production of glycerol from corn amylum is to be carried out by fermen-
tation using yeast cells (Proc. 2nd Joint ChindUSA Chemical Engineering
Conference, Beijing, China, Vol. 111, p. 1094, 1997). The growth. law is

‘g = PCC
with

CS
tJ- = Po
K, + C, + Ci/ Ksl

k0 = 0.25 h-’
K, = 0.018 mg/mL
K,, = 11.8 mg/mL
CJ = 32.4 mg/mL
KpI = 0.06 mL/mg

= (ap+ p)C, a = 34.5 f3 = -0.147
dt
dS - 1 dP Ypis = 1.33
dt Ypis dt

Plot the concentration of cells, substrate, and product as a function of time for
initial concentrations of cells of g/dm3 and a substrate concentration of
50 g/dm3.
W-31B Wastewater containing terephthalic acid (TA) is treated using two aerobic
sludge tanks in series (Proc. 2nd Joint China/USA Chemical Engineering
Conference, Beijing, China, Vol. 111, p. 970, 1997). The first tank was 12 dm3
and the second was 24 dm3. It is determined to reduce the TA concentration
(reported in chemical oxygen demand, COD, mg/dm3) from 5000 mg/dm3 to
below 100 mg/dm3). The results of the experiments were reported in the fol-
lowing manner:
CCV
1
Tank 1: = 0.16- + 0.62
uo (Go - C,) CS
with po = 1.61 day-’ (g substrate/g cell+and Ks = 0.25 g/dm3 for the
Monod equation.

Tank 2:

where C, is the concentration of biomass in the tank and Cso and Cs represent
the entering and exiting concentration of TA in the waste stream.
Design a CSTR sludge system to handle a wastewater flow of 1000
m3/day:
loading = 5-6 -
kg COD
m3.h