Mejoramiento de la calidad de agua residual de una industria gráfica por método fisicoquímico y tratamiento Fotofenton

Abstract

Wastewater samples from flexographic printing machines of the graphic industry characterized by having high coloration, low pH, high oxygen demand and low biodegradability to primary physicochemical treatment followed by photofenton process with the objective of reducing chemical oxygen demand (COD). Initially, the pouring generator washing process was standardized, the primary treatment consisted of coagulation with aluminum polyhydroxychloride or ferric chloride, followed by filtration with activated carbon. The Fenton process was optimized by varying the pH, and the particles of iron and peroxide. The standardization of the washing process generated a 50% COD reduction, in the primary treatment, aluminum polyhydroxychloride was the best performance. After one hour of treatment with the photofenton process with UV lamp at pH: 4.0; 40.0 mgL-1 of Fe2+ and 200 mgL-1 of hydrogen peroxide, a 97% removal was processed. Thus, by coupling the physicochemical treatment with the photofenton process, the environmental impact of the wastewater of the graphic industry is reduced.