Estudo da fotodegradação de efluentes de indústrias de tintas

Abstract

The paint industries use in their processes a large amount of dyes and pigments. Which in turn leave the colored effluent can be highly interfering in photosynthetic processes. Recent studies have shown that approximately 12% of synthetic dyes are lost in the process of production and use, reaching the environment, and their color can suppress the photosynthetic processes in water courses. Besides the environmental problems related to color, many of primary degradation products of these effluents can be toxic and / or not biodegradable. In this study we assessed the dependence of photodegradation process effluent samples from a paint manufacturing industry, according to the type of radiation and variables contact time, pH, the presence and absence of photocatalysts. Quantification of dyes and pigments in solutions before and after photobleaching was performed using UV / Vis spectroscopy. The results showed that there is a strong dependence of this process with the acidic or basic conditions of the solutions. And that the best conditions for photocatalysis this effluent takes place in an acid medium. At the end of this work, it can be said that the use of this methodology is possible, with technical and economic feasibility for the solution of a problem of water pollution, arising from no treatment of industrial effluents.