An integrated electrocoagulation and ozonation process for removal of indigo carmine dye from denim processing effluent

The goal of this research was to improve the effectiveness of dye removal from textile wastewater by integrating electrocoagulation and ozone oxidation processes. Effluent from a denim dyeing facility where the primary pollutant is the organic dye indigo carmine was treated to reduce color, turbidity, and chemical oxygen demand (COD). While ozonation alone only removed 33% of the blue color, 34% of the turbidity, and 7% of COD, the integrated process removed 84, 92, and 8%, respectively. The UV-Vis spectra and cyclic voltammograms also show the improvement in water quality.