Effect of the mixing velocity and the active chlorine concentration in anolyte on the indirect electrochemical oxidation of the Acid Red35 dye

The main objective of this work is to study the effect of the agitation rate and the concentration of active chlorine on the efficiency of the degradation of the acid red35(ar35) dye by indirect electrochemical oxidation. the experimental tests were carried out in a stirred tank with a reaction volume of approximately 350 ml. the reynolds number is set to a high value so that the mixture is perfect. the synthetic solution of the dye at a concentration of 20 mg·l-1 and the initial ph of the anolyte used for the treatment is between 3.2 and 4.4. the stirring velocity has a very limited effect on the degradation of the dye for a 16.6% added anolyte volume fraction containing 210 ppm of active chlorine. for the same volume fraction of anolyte and a stirring velocity of 300 rpm,the temporal evolution of the dye concentration shows that the time required for an 80% reduction has increased from 3 to 40 minutes for chlorine,respectively,of 440 and 120 ppm. the effectiveness of the treatment of the synthetic solution of the ar35 dye increases as the concentration of active chlorine increases. in addition,empirical correlations expressing the results were developed based on curve fitting. these correlations estimate the time required for the degradation of the ar35 dye as a function of the volume added of the anolyte and the yield of the discoloration as a function of the reaction time for different concentrations of active chlorine. © 2017,university of mohammed premier oujda morocco.