Avaliação da eficiência dos processos oxidativos avançados para o tratamento de efluentes sintéticos contendo azul de metileno

Abstract

In recent decades, environmental problems have become increasingly worrying and frequent, mainly due to population growth and increased industrial activities. The textile industry has a major impact on the world economy, however, textile dyes impact the environment mainly because they are difficult to break down. The process for development and optimization of the process of consuite such processing. Advanced Oxidative Processes (POAs) are processes that basically generate free radicals, especially the hydroxyl radical (OH), with high oxidizing power and can promote a degradation of several pollutants efficiently. They are becoming the alternative process of treating effluents due to their high efficiency in the degradation of these dyes. In this work, the oxidation of a synthetic solvent based on the POAs: photolysis, H2O2 / UV, TiO2 / UV and their association, such as: H2O2 / TiO2 / UV, was carried out. From the obtained results it was observed that the use of POAs was efficient, without total reaction time with the exception of photolysis. The association of POAs had a greater efficiency in a shorter time, that is, a reduction of the time in which the POAs individually occurred. The necessary measurements were followed to the following efficiency sequence: TiO2 / H2O2 / UV >> TiO2 / UV> H2O2 / UV> photolysis (UV). Although there was a reduction of more than 90% of the dye concentration for some processes, the COD reduction of the solution was insignificant for this result. Thus, all the processes indicated that the combination was obtained only with chromium growth oxidation which reduced the resolution.