Tratamiento de efluentes contaminados con colorantes azoicos, provenientes de una industria textil, mediante un proceso foto-Fenton continuo

Abstract

In this work the degradation of two azo dyes: Direct Blue 1 and Acid Brown 83 were studied: and also the treatment through a photo-Fenton process of colored effluent from a textile industry in Pelileo. Pure dye solutions and a mixture of them were treated to determine the kinetics of the process under different conditions and the best dose of ferrous sulfate to allow reaching the maximum degradation of these dyes and greater removal of true color in the mixture thereof. Dyes were degraded according to a pseudo first order kinetics with values of k between 0,18-0,50 min-1 for the color Direct Blue 1 and 0,53-1,54 min-1 for color Acid Brown 83. The highest color removal was achieved with 200 mg/L of ferrous salt under a molar ratio Fe2+: H2O2 of 1: 5. This value was set in the treatment of effluent in "batch" mode, for which, at 8 min treatment,the highest COD and color reduction in the textile effluent was reached, and these values were within the legislation. According to the residence time given, two reactor feed streams: 30 and 50 mL/min for continuous treatment were tested. 60 % reduction of COD and 98 % removal of true color at a flow of 30 mL/min was obtained. The total cost to implement the treatment system of 3 m3/day was estimated at 205 749.00 USD. The cost per m3 of treated effluent was 15,88 USD.