Environmental Engineering Reference
In-Depth Information
(c) Breakthrough time (
t
bt
)
(d) Breakthrough volume (
V
T
).
Solution:
180 m
3
24 hrs
Q
Q
b
=
hr
75 m
3
(a) (
BV
)
=
0(
BV
)
=
3
.
2
.
75 m
3
)(400 kg
m
3
)
(b)
M
=
(
BV
)(
ρ
s
)
=
(3
.
/
=
1500 kg
V
pilot
B
M
pilot
2000 L
4
Since
V
pilot
T
=
2000 L at
C
=
8 mg/L
,
=
13 kg
=
484 L
/
kg
.
180 m
3
24 hrs
·
Q
V
=
1kg
484 L
·
1000 L
m
3
M
t
=
=
15
.
5kg
/
hr
(1500 kg)
M
M
t
=
hr
15 kg
(c)
t
bt
=
=
100 hrs or approx. 4 days
180 m
3
24 hrs
(100 hrs)
750 m
3
(d)
V
T
=
Qt
bt
=
=
.
Note
: If you are given the cross-sectional area of the pilot column, you can calculate
the diameter of the design column. The volumetric flowrate of each column is known
and the velocity in each column is the same. The design column length can then be
calculated since the bed volume is known.
250
200
150
100
at C= 8 mg L,
V= 2000 L
50
0
0
500
1000
1500
2000
2500
3000
3500
Volume of water treated (L)
Figure 7.12
Breakthrough curve for TOC removal from wastewater by GAC
adsorbent (Example 7.1).
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