Agriculture Reference
In-Depth Information
k
1
= 0.1 hr
-1
1.0
k
2
= 1 hr
-1
0.1
0.01
0.001
b
= 1,
K
f
= 1
0.8
0.6
0.4
0.2
0
0
1
2
3
4
5
6
7
8
9
10
V/V
o
FIGURE 3.18
Breakthrough curves for several values of the kinetic rate coefficients
k
1
and
k
2
. (From Selim
and Amacher, 1997. With permission.)
where
K
f
= 2, nearly three pore volumes were required prior to the detection
of solute in the effluent solution. In the meantime, a reduction of concentra-
tion maxima and the presence of tailing of the desorption side is observed
for large
K
f
values. This is due not only to the large
K
f
values used but also to
the nonlinearity of the equilibrium mechanism (
b
≠ 1) chosen here.
The influence of a wide range of
b
values on the shape of the BTC is shown
in Figures 3.16 and 3.17. For all the BTCs shown in Figures 3.16 and 3.17, a
K
f
of unity was used. For values of
b
< 1, the shape of the BTCs indicates a sharp
k
1
/
k
2
= 1
k
2
=
k
2
= 1 hr
-1
0.1
0.001
1.0
0.8
0.6
0.4
0.2
0
0
1
2
3
4
5
6
7
8
9
10
V/V
o
FIGURE 3.19
Breakthrough curves for several
b
values where the kinetic rate coefficients
k
1
and
k
2
where the
ratio
k
1
/
k
2
remains invariant. (From Selim and Amacher, 1997. With permission.)
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