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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