Review: Catalytic Ozonation of Textile Dyes

Abstract

The textile industry consumes large quantities of water and chemicals for textile processing units. The
effluents have high concentrations of organic and inorganic compounds. Wastewater from spent dye baths and dye
rinsing operations in the textile industry contains unfixed dyes that may be highly colored. Considering volume discharge
and wastewater composition, textile wastewater is considered as the most polluting among all industrial sectors.
Through new environmental concerns and regulations, pressure is being placed on textile companies to reduce pollutants
and reuse process water and chemicals. The presences catalysts significantly improve the degradation efficiency of the
dye, the utilization efficiency of ozone and the production of oxidative intermediate species compared to the results from
non-catalytic ozonation, and the improvement of them is even more pronounced in the presence catalyst. Some of the
main operating variables like amount of catalyst, ozone dose and pH exert a positive influence on the degradation
efficiency of dye. Ozonation process along with catalyst was found to be effective.