Reducción de color con cloruro de magnesio en soluciones con colorantes comerciales

Abstract

The aim of this study was to experiment with diIerent concentrations of magnesium chloride (MgCl2) as a coagulant to reduce the color in commercial dye solutions: black, blue and brown. The parameters analyzed according to the Mexican Standards were pH, color, chemical oxygen demand (COD) and total suspended solids (TSS). Additionally, an activated carbon was added to the samples to reduce residual color after the coagulation-Docculation test. The reduction of color and COD values was greater when more amount of MgCl2 (1.8 g/L) was added. The reduction percentages were ≥90% in the color and >50% for COD. The TSS increased with the addition of MgCl2. Activated carbon removed residual color.