after the first application step (ferrate application in time 0.75 h) and also after the
second application step (first dose of hydrogen peroxide in time 1.25 h). Rapid
increase in the dissolved oxygen concentration after the second application step was
caused by decomposition of dosed hydrogen peroxide. Significant increase in both
Container
Blank
Container
Blank
Container
Blank
Dissolved oxygen (mg/L)
1.25
0.75
5.00
Eh
1.25
0.75
5.00
5.00
1.25
0.75
pH
a
b
c
8
7.5
6.5
7
6
5.5
5
0
600
500
400
300
40
35
30
25
20
15
10
5
0
0
4
8
1 2
1 6
2 0
2 4
Time (h)
200
100
0
0
4
8
1 2
1 6
2 0
2 4
Time (h)
4
8
12
16
20
24
Time (h)
Fig. 14.5 Evolution of
physicochemical parameters
in the reaction container and
in the blank sample during
the pilot test: (a) pH, (b)
redox potential (E h ), (c)
concentration of dissolved
oxygen; the time axis
includes times of the
applications (corresponding
to Table 14.3)
14 Field Study V: Combined Oxidation Technology Using Ferrates (Fe
IV–VI
). . .
325