Biomedical Engineering Reference
In-Depth Information
TABLE P12.21
Time, h
X
, g/L
P
, g/L
0
0.25
1
0.28
2
0.57
3
0.87
4
1.29
5
1.85
6
2.56
0
7
3.40
0.004
8
4.53
0.019
9
5.89
0.054
10
7.97
0.120
11
9.05
0.207
12
9.44
0.324
13
9.63
0.481
14
9.78
0.703
15
9.86
0.916
16
9.93
1.008
17
9.95
1.055
18
9.95
1.073
19
9.95
1.077
20
9.95
1.077
12.22. The BOD
5
(Biological Oxygen Demand in 5 days) value of a wastewater feed stream to
an activated sludge unit is
S
0
¼
0.30 g/L, and the effluent is desired to be
S
¼
0.03 g/L.
10
7
L/day. For the recycle ratio of
R
The feed flow rate is
Q
¼
2
¼
0.5 and a steady-
state biomass concentration of
X
¼
5 g/L, calculate the following:
(a) Required reactor volume (
V
).
(b) Biomass concentration in recycle (
X
R
).
(c) Solids concentration ratio
c
R
.
(d) Determine the daily oxygen requirement.
Use the following kinetic parameters:
day
1
day
1
m
max
¼ 1:5
;
K
S
¼ 0:4
g
=
L
; YF
X
=
S
¼ 0:50
g-X
=
g-BOD
; k
d
¼ 0:07
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