Environmental Engineering Reference
In-Depth Information
100
90
80
70
60
50
40
30
Treated vermiculite
Vermiculite
20
10
0
30
60
90
120
150
180
Time (min)
Fig. 5.14
Hg
0
adsorption ability of vermiculite treated by dipping of active MnO
2
100
90
80
70
60
Treated vermiculite
Vermiculite
50
40
30
20
0
30
60
90
120
150
Time (min)
Fig. 5.15
Hg
0
adsorption ability of vermiculite treated by dipping of FeCl
3
5.3.2.5 Evaluation of the Mercury Adsorption Ability of Modified Sorbents
Adsorption efficiency, cost and operation complexity of the modified method were
the three important factors considered in the project application of adsorption
technology. The effective adsorption times of modified sorbents with good Hg
0
adsorption abilities were all acquired at reasonable cost. These modified sorbents
included the following: activated carbon treated by dipping into active MnO
2
(AC-MnO
2
), vermiculite treated by dipping into active MnO
2
(ZS-MnO
2
), bentonite
treated by dipping into active MnO
2
(PT-MnO
2
), zeolite treated by dipping into
active MnO
2
(FS-MnO
2
), activated carbon treated by dipping into ferric trichloride
(AC-FeCl
3
), and vermiculite treated by dipping into ferric trichloride (ZS-FeCl
3
).
A comparison of the preparation process of three modification methods showed
that the simplest modification method was the dipping treatment of FeCl
3
, which
merely required the addition of a certain amount of FeCl
3
into HCl and mixing. The
dipping treatment of active MnO
2
was prepared by mixing Mn(NO
3
)
2
, KMnO
4
, and
HNO
3
in a fixed way for a combined reaction. The process of sulphurization was the
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