The Application of Response Surface Methodology in the Study of Photodegraded Industrial Dairy Effluents by the Photo-Fenton Process: Optimization and Economic Viability

Table 2

Box-Behnken matrix values in the study of dairy effluent treatment by a Photo-Fenton process, through the factors pH, Fenton reagent, and UV irradiation, operating on 3 levels (low represented by −1, intermediate represented by 0, and high represented by 1).

Exp.	Central point	Block	pH	Fenton	UV
1	2	1	−1	0	−1
2	2	1	−1	0	−1
3	0	1	0	0	0
4	2	1	−1	−1	0
5	2	1	0	1	1
6	0	1	0	0	0
7	2	1	−1	0	1
8	2	1	0	1	1
9	2	1	−1	1	0
10	2	1	0	−1	−1
11	0	1	0	0	0
12	0	1	0	0	0
13	2	1	1	0	−1
14	0	1	0	0	0
15	2	1	−1	−1	0
16	2	1	0	1	−1
17	2	1	1	−1	0
18	2	1	−1	1	0
19	2	1	0	−1	−1
20	2	1	1	−1	0
21	2	1	−1	0	1
22	2	1	1	1	0
23	2	1	0	−1	1
24	2	1	0	−1	1
25	2	1	0	1	−1
26	2	1	1	0	1
27	0	1	0	0	0
28	2	1	1	1	0
29	2	1	1	0	1
30	2	1	1	0	−1