Estudo de fotodegradação de efluente sintético composto pelos corantes alimentícios, vermelho de eritrosina e azul brilhante: utilizando radiação ultravioleta em um sistema dinâmico

Abstract

It is a necessity to make the actions of man a social and environmental responsibility, for this reason it is possible to point out the problem of the disposal of the effluents by the food industries in the bodies of water without the due treatment. In these effluents the synthetic dyes are present and their strong coloration diminishes the capacity of penetration of the solar radiation in the flow damaging the aquatic biota. Thus, this work proposed the treatment of synthetic effluent composed of erythrosine red and blue dye, through the photodegradation by ultraviolet radiation, observing the factors: irradiation time and pH of the solutions, aiming at the development of color removal techniques from this effluent. For this purpose, a reactor was used whose main component is ultraviolet radiation, produced by a high-pressure mercury vapor lamp with a perpendicular laminar flow. The solution was homogenized by a universal electric pump, causing the simulated effluent to pass continuously through the insulated system containing the lamp. The results showed that this methodology was satisfactory in the total discoloration of the solutions in less than 120 minutes. In addition, the irradiation study of the samples as a function of pH showed a dependence of the efficiency of this process with this parameter, obtaining better results for the acid medium.