COMPARATIVE PILOT TEST OF CATALYTIC OZONE OXIDATION AND NaClO IN TREATING TITANIUM DIOXIDE WASTEWATER

Taking the secondary pressure filtration water from a titanium dioxide plant in Shandong as the research object, the catalytic ozonation process and the treatment of titanium dioxide wastewater were investigated through a self-designed pilot plant, and the best experimental conditions for catalytic ozonation process were determined as follows:at room temperature, the catalytic ozone oxidation reaction time was 60 min, and the ozone concentration was 125 mg/L. The original NaClO process was also optimized, and the best process after optimization was as follows:NaClO dosage was 1.2%, and the reaction time was 30 minutes. When the average influent COD and ammonia nitrogen were 109.7 mg/L and 12.8 mg/L, the average effluent COD and ammonia nitrogen of the catalytic ozone process were 43.5 mg/L and 3.8 mg/L, respectively, and the average removal rates were 60% and 70.4%, respectively; and the average effluent COD and ammonia nitrogen in the NaClO process were 49.8 mg/L and 4.7 mg/L, respectively, and the average removal rates were 54.5% and 63.1%, respectively. Within 30 days, the standard-meeting rate of the catalytic ozonation process effluent was 100%, and that of the NaClO process effluent was 26.7%; the running cost of catalytic ozonation ton water treatment was RMB 1.12/t, and that of the NaClO treatment was RMB 12/t. The catalytic ozonation process was more suitable for treating titanium dioxide wastewater, compared with The NaClO oxidation process.