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Table 1
The ranges and levels of experimental variables
Variables
.
Symbol
.
Range and levels
.
− 1
.
0
.
+ 1
.
H
2
O
2
concentration (g/L)
A
6.66
8.88
11.1
Reaction time (min)
B
120
180
240
Initial pH
C
1.5
3
4.5
Fe/C dosage (g/L)
D
400
800
1,200
Variables
.
Symbol
.
Range and levels
.
− 1
.
0
.
+ 1
.
H
2
O
2
concentration (g/L)
A
6.66
8.88
11.1
Reaction time (min)
B
120
180
240
Initial pH
C
1.5
3
4.5
Fe/C dosage (g/L)
D
400
800
1,200
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