Decolorization Of Textile Dye Solutions

Results are presented on the use of ozone to decolorize textile dye solutions. The results describe the rates of reaction and the stoichiometry for the use of ozone to decolorize a simulated wastewater containing a bisazo acid dye (Acid Red 158). These rates of reaction are not sensitive to pH and are only mildly affected by temperature. The effects of a combination of an uncolored organic compound on the rates of reaction were investigated because if ozone reacts preferentially with uncolored compounds, its use might not be economical. Guar gum used in the textile industry as an aid in dyeing carpets increases the consumption of ozone by 20–60% for the conditions studied and has a small effect on the reaction rate. The competition found is not severe enough to make ozone treatment uneconomical.