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. 2014 Jan 14;12:31. doi: 10.1186/2052-336X-12-31

Table 3.

The experimental design for the reduction rate of TPH from oily sludge sample at Shiraz oil refinery using Taguchi method

Number of experiment Levels of different variables
 TPH reduction rate (%)
H2O2 to sample mass ratio H2O2 to Fe(II) molar ratio Retention time pH 1st repetition 2nd repetition
1
 3
 3
 3
 3
 14.1
 14.26
2
 3
 1
 3
 3
 8.76
 8.85
3
 1
 4
 4
 3
 21.41
 21.53
4
 2
 1
 2
 4
 4.58
 46
5
 4
 1
 4
 2
 11.31
 11.36
6
 4
 4
 2
 1
 9.41
 9.51
7
 2
 3
 4
 1
 15
 15.05
8
 4
 2
 3
 1
 34.99
 35.05
9
 2
 2
 1
 3
 7.66
 7.74
10
 4
 4
 1
 4
 23.28
 23.24
11
 2
 4
 3
 2
 19.87
 19.87
12
 3
 2
 4
 4
 35.1
 34.97
13
 4
 3
 2
 3
 20.89
 20.99
14
 1
 3
 3
 4
 1.32
 1.41
15
 1
 1
 1
 1
 6.2
 6.3
16 1 2 2 2 22.54 22.57