Solar Fenton Corrosion in the Recovery of Textile Wastewater: Influence of UV Radiation and Chlorides on the In-Situ Release of Fe

A solar corrosion Fenton reactor (SCFr) was developed by packing an iron-carbon steel filament inside the reactor to enable the in-situ release of Fe2+. A Box-Behnken experimental design was used to optimize the effect of HRT (20, 30, and 40 min), the mass ratios of the packed filament inside the reactor with respect to volume (0.1, 0.2, 0.3 w/v) and the peroxide dosage added (500, 1000, and 1500 mg/L), the response variables were % removal of COD, Color and Turbidity. The optimum conditions for SCFr were HRT of 24.5 min, a ratio of 0.16, and a peroxide dose of 1006.9 mg/L. The removal was 91.8%, 98.4%, and 87.3% COD, Color and Turbidity respectively. Without solar radiation, the % removal was reduced, 16.3%, 47.9%, and 34.0% COD, color and turbidity respectively. The concentration Fe2+ released was 25.4 mg/L of Fe2+. The w/v ratio was the most significant factor, the release of the Fe is stimulated by UV radiation and the chloride concentration of the wastewater which prevents the formation of an oxide layer, thus allowing its continuous release, it takes advantage of solar radiation, pH and chloride concentration of the raw sample.