Aplicação de ozônio no tratamento de corante em efluentes da indústria têxtil

Abstract

The textile industry is one of the main sources of water contamination due to the discharge of effluents containing synthetic dyes, which are highly toxic and difficult to degrade. In this context, this study evaluated the efficiency of ozonation as an advanced oxidation process for the removal of the dye Procion Yellow (PY) in textile effluents, using the Box-Behnken experimental design to optimize operational conditions. Based on statistical analysis, the best treatment condition was determined as pH 4.45, an initial dye concentration of 143 mg L⁻¹, ozone production of 18 mg O₃ L⁻¹, and a reaction time of 34 minutes, achieving removals of 90.84% for PY, 80.01% for COD, and 36.04% for TOC. The adjusted statistical model demonstrated high accuracy, with elevated determination coefficients (R²), and the analysis of variance (ANOVA) confirmed the reliability of the results. The application of ozonation proved to be highly efficient in color removal and organic load reduction, highlighting its potential as a viable alternative for the treatment of textile effluents. However, the lower efficiency in TOC removal suggests the need for further investigations, including the combination of ozonation with other advanced oxidation processes, such as Photo-Fenton and heterogeneous photocatalysis, to enhance the mineralization of residual organic matter. Additionally, studies on the economic feasibility and scalability of the process are essential for its large scale implementation, ensuring a sustainable and efficient treatment for the textile industry. Keywords: Ozonation; AOP’s; Box-Behnken; Procion Yellow.