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

Table 1

Factors and respective levels used for the experiment matrix for the Box-Behnken in the treatment of dairy effluent by Photo-Fenton process.

Factor	Level (−1)	Level 0	Level (1)
pH	3	3.5	4
Fenton reagent (mH2O2 g + mFe^2+ g)*	30.0 g H2O2 + 2.1 g Fe^2+	32.5 g H2O2 + 2.6 g Fe^2+	35.0 g H2O2 + 3.6 g Fe^2+
Ultraviolet	None	15 W	28 W

∗Both H₂O₂ and Iron II were used in solutions whose concentrations were [H₂O₂] = 30% m/m and [Fe²⁺] = 0.82 mol L⁻¹ showing values proportional to 3 L of treated effluent.