Removal of Colour from Tannery Dye Wastewater Using Ozone

Colour removal of wastewater containing acid dye (Navitan Bordeaux MB) by ozone treatment has been studied in an attempt to abate pollution caused by leather dyeing houses. The Navitan Bordeaux MB dye is commonly used in commercial leather manufacturing. The effluent has been synthetically prepared using water with 100 ppm concentration of dye. Passing ozone in a bubble column reactor containing the dye solution carried out the decolourisation process of the premetallised acid dye. The effect of dye concentration, ozone dose and pH on the rate of decolourisation has been studied. The efficiency of the decolourisation has been evaluated by measuring absorbance of the dye solution.