Estudo da remoção de corantes em colunas de leito fixo utilizando como adsorventes quitosana e escama de peixe

Abstract

This study evaluated the use of the technique of adsorption in fixed-bed column using chitosan and fish scale to treat wastewater contaminated with dyes (Indigo Carmine (IC), Reactive Black 5 (RB05) and Reactive Orange 16 (RO16)). We tried to identify the interaction between the adsorbate and adsorbent and evaluate the influence of parameters: initial concentration of the dye in the effluent, bed height and flow rate in the maximum adsorption capacity. To achieve these objectives the adsorption studies were conducted in fixed bed in a glass column 9 cm and 0.6 cm in diameter. The concentration of dye in the effluent was monitored by measuring their absorbance alert of a UV-VIS spectrophotometer. The results of adsorption of the dyes on the chitosan and fish scales are presented in the form of breakthrough curves (C / Co vs. t). The adsorbed amount of each solid in the column, the balance was calculated. Starting of the curve data burst data were obtained from many different alert nonlinear models (Thomas, Model Adams-Bohart, Model Model Yan and Yoon-Nelson). Starting studies of fixed bed adsorption, is obsevou RO16 that the adsorption of the chitosan showed the highest amount adsorbed on average 30 mg g-1, the amounts found in HF and RB05 chitosan. As for the fish scale, the RB05 had the highest amount adsorbed on average 56 mg g-1, compared to IC and RO16. It was also observed that the model of Yan was suitable to represent the results obtained for the adsorption column so as to HF and RB05 RO16 in chitosan. No model was adequate to represent the results obtained for the adsorption column IC and RO16 in fish scales. Models Thomas and Adams-Bohart were the most suitable to represent the curve data burst in the adsorption RB05 fish scales. These results show that the parameters: initial concentration of dye in the effluent flow and the bed height influence the maximum quantity adsorbed and that the employed methods were adequate in view of the results obtained allow to make a clear and consistent evaluation, the performance of such adsorption technique for effluents contaminated with dyes.