OZONE APPLICATION AS AN ALTERNATIVE METHOD TO THE CHEMICAL TREATMENT TECHNIQUE FOR TEXTILE WASTEWATER

Abstract

In this study, chemical oxidation demand (COD) and color removal efficiencies of a textile industry were tested using chemical and ozone oxidation treatment techniques. The industry uses chemical processes to treat its wastewater, so it needs much time and operation cost. Herein, the applicability of ozone oxidation techniques was discussed as an alternative to the chemical treatment. The optimum treatment time was determined to be 10 min of zonation, and the optimum ozone concentration was 32 mg/L. With this dose, the effluent quality was maximized, the time was shortened and the cost of the treatment decreased to 54.9%. While the COD and color removal were 56% and 87.5%, respectively, with the current chemical treatments, these values increased under the ozone application to 59.8% and 91.4% for COD and color, respectively. The removal rate of the color and COD via zonation can be described by the pseudo-first-order kinetics. The kinetic results show that the effect of zonation on color removal exhibited higher removal rates than COD removal.