Abstract: Researched into effects and affection of different treatments, i. e. stimulated dyeing wastewater containing reactive brilliant blue KN－R treated by UV, O3－oxide and process of combined UV/O3 respectively. The effects of operation parameters such as initial dye concentration, catalyst loading, hydrogen peroxide dosage as well as initial pH value were studied. Experiment results showed that the effect of single UV method was not obvious, O3 method had a high effect on decoloration, however, was not that efficient on COD removal rate, the decoloration effect of UV/O3 combined method was obviously better than single UV method or O3 oxidation process, the decoloration rate was 99.4 ％ and the COD removal rate up to 32.0 ％ in conditions that the pH of wastewater was 12, the air ozonation flow rate was controlled at 80 L／h and the reaction time was 60 min.

Key words: ultraviolet radiation, ozone, active brilliant blue KN－R, decoloration rate, removal rate of COD, textile wastewater