450
J. Thiiming et al.
•
•
:::J 50
100
--(5
E
~
E
0
--80 c
c
40
Cil
.Q
Hg-removal
>
~
60
0
E
C
HOCI
~
CIJ
u
0>
c
40 I
0
30
u
0
0
0
20
I
20
0
0
50
100
150
time /min
Fig. 6. Leaching kinetics for the German sample (G) during EL-IL
0.04
100
::::J
0 _ _ 0 ______
--0
80
(5
..s 0.03
0
~ 0
c
c
.Q
0
60 Cil
~
0
>
0
C 0.02
E
ID
~
u
40
c
0>
0
u
I
0 0.01
- 0 - Hg-removal
0
I
0 HOCI
20
0.00
0
5
6
7
8
pH
Fig. 7. Influence of pH on the reaction rate and consumption of hypochlorite
readsorption effect is assumed to be responsible for the remaining 1 mg/kg of
mercury in the soil.
Electrolytic Purification of the Leachate
Results of electrodeposition of mercury, from the resulting leachates, are shown
for the worse case which is a highly concentrated leachate. Figure 9 shows how
the current efficiency varies with time during the potentiostatic electrodeposition