TRATAMENTO DE EFLUENTE DE LATICÍNIO POR PROCESSO OXIDATIVO AVANÇADO TIPO FENTON-FOTOCATALISADO

TREATMENT DAIRY INDUSTRY WASTEWATER BY ADVANCED OXIDATION PROCESSES PHOTOCATALYSIS-SELF-FENTON SYSTEM

With the increase in industrial production, there is a direct increase in waste generation. Milk processing industries are one of these cases that results in a complex effluent with a high organic load. If the effluent is discarded without proper treatment, it can compromise the survival of biota in water courses. Advanced oxidation processes (AOP) are one of the main technologies used in the treatment of effluents, especially the Photocatalysis-Self-Fenton System (PF) type. The present study aimed to evaluate the efficiency of the PF process and to optimize the parameters of dairy effluent treatment. The raw effluent was characterized considering the parameters: conductivity, pH, chemical oxygen demand (COD), solids, and oils and greases. Through an experimental design, the variation of the concentrations of Fe²⁺, H₂O₂ and the reaction time were optimized, and the influence of these three variables on the removal of COD was evaluated. Statistical analysis showed that all variables were statistically significant, and the model used had a coefficient of determination of 0.97, confirming that the model was well adjusted. The ideal conditions for COD removal, reaching 79%, were obtained in 60 min, 0.625 g L^-1 of Fe²⁺ and 0.829 mL L^-1 of H₂O₂.