(585d) Removal of Color By Eletrocoagulation Method - Preliminary Results in Textile Dyes

This work is aimed to the study of the electrocoagulation process (EC) applied to the removal of two characteristic dyes from the textile industry: Danix Marinho S-2G 200% (Disperse, Dye A), Remazol Brilliant Blue Reactive (Reactive, Dye B). A lab-scale electro-coagulation reactor consisting of a set of six equidistant and parallel aluminum plates within a 2,5 L container was used whose performance change according to two important variables: effluent initial pH (Dye A: 5-7; B: 7-9) and electric current (6-8 A). To obtain a significant effect in the process, it was also evaluated by Response Surface Methodology (RSM), with a 2² factorial design. The response variable to evaluate the efficiency of the process was the percentage of color removal. An important influence of the initial pH on the two dyes was observed, showing that in the ranges of study, higher initial values achieve to higher color removal results in both dyes. In relation to the intensity of current it was evidenced that the highest value, the best as color removal. Resulting in the best reactor performance was achieved at 8 A and 7 initial pH for the dye A, while 8 A and 9 initial pH, was achieved for the dye B. Under these conditions, more than 99% of color was removed, for both dyes. The EC treatment to study Danix Marinho S-2G 200% and Remazol Brilliant Blue Reactive showed favorable responses. Thus, indicating clearly that the method of electrocoagulation is very promising alternative for textile industrial applications.