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Table 3 Experiment design according to RSM method and the measured response

From: Improved biodegradability of hardly-decomposable wastewaters from petrochemical industry through photo-Fenton method and determination of optimum operational conditions by response surface methodology

Test number Input variable parameters (mg L−1) Response Test number Input variable parameters (mg L− 1) Response
COD H2O2 Fe2+ TDS BOD/COD COD H2O2 Fe2+ TDS BOD/COD
1 1750 1000 1750 8000 0.299756 28 1750 4000 1750 8000 0.451106
2 1375 1750 1125 9750 0.385659 29 2500 2500 1750 8000 0.356573
3 2125 3250 1125 9750 0.374284 30 1750 2500 1750 8000 0.474479
4 1750 2500 1750 11,500 0.421166 31 1750 2500 1750 8000 0.396539
5 1375 1750 1125 9750 0.38932 32 1375 3250 1125 6250 0.503843
6 1375 3250 2375 6250 0.581491 33 1375 3250 1125 6250 0.501281
7 1750 4000 1750 8000 0.44911 34 1375 1750 1125 6250 0.388727
8 1750 2500 1750 4500 0.424155 35 2125 3250 1125 6250 0.374841
9 1750 2500 1750 8000 0.37437 36 2125 1750 2375 6250 0.336815
10 1375 3250 2375 9750 0.581357 37 1375 1750 2375 9750 0.444746
11 1000 2500 1750 8000 0.59867 38 2125 3250 2375 6250 0.428827
12 2125 1750 1125 9750 0.300457 39 2125 3250 1125 6250 0.374444
13 1750 2500 1750 8000 0.460101 40 1375 1750 2375 9750 0.444746
`14 1375 3250 2375 9750 0.581357 41 2125 3250 2375 9750 0.426278
15 1375 1750 2375 6250 0.444545 42 1375 1750 2375 6250 0.443841
16 2125 1750 1125 6250 0.301307 43 1750 2500 1750 11,500 0.422882
17 1750 2500 500 8000 0.319115 44 2125 1750 2375 9750 0.337247
18 1000 2500 1750 8000 0.599777 45 2500 2500 1750 8000 0.356953
19 1750 2500 3000 8000 0.441197 46 1750 2500 3000 8000 0.442775
20 1375 3250 2375 6250 0.581833 47 2125 1750 2375 9750 0.337247
21 2125 3250 2375 6250 0.426786 48 2125 1750 1125 9750 0.30085
22 2125 3250 2375 9750 0.426357 49 2125 1750 2375 6250 0.337467
23 2125 1750 1125 6250 0.30085 50 1750 2500 500 8000 0.319653
24 1375 3250 1125 9750 0.470356 51 2125 3250 1125 9750 0.375318
25 1750 2500 1750 8000 0.422495 52 1375 1750 1125 6250 0.387379
26 1750 2500 1750 8000 0.422799 53 1750 1000 1750 8000 0.300979
27 1750 2500 1750 4500 0.422799 54 1375 3250 1125 9750 0.501288