Homogeneous Catalytic Ozonation Treatment Of Simulated Acid Red B Wastewater In A Ratating Packed Bed

Dyes have very extensive uses including textile dyeing and finishing industry, papermaking, plastic, leather industry, rubber products and food industry. The discharge of dye wastewater contaminates the ecosystem and leads to many environmental problems. So the treatment of dye wastewater becomes one of the most important subjects in water treatment. This work investigated homogeneous catalytic ozonation of simulated Acid Red B wastewater in a rotating packed bed (RPB). Several main factors which affected the decolorization were discussed and appropriate operating conditions were proposed. The main work is as follows:1,The degradation of Acid Red B by O3 in RPB. The effects of rotating speed, pH, gas flow rate, liquid flow rate and initial concentration of Acid Red B on the decolorization were explored. The results showed that the decolorization increased with the increase of rotating speed and gas flow rate. The decolorization decreased with the increase of liquid flow rate and initial concentration of Acid Red B. Alkaline environment is favorable for O3 degradation. 2,The degradation of Acid Red B by O3/Fe2+ in RPB. The effects of rotating speed, pH, Fe2+ concentration, gas flow rate, liquid flow rate and initial concentration of Acid Red B on the decolorization were explored. The result showed that decolorization effect of homogeneous catalytic ozonation is much better than that of O3 degradation in acid conditions. The decolorization of Acid Red B reached above 97% with a temperature of 25℃, rotating speed of 800 r/min, pH of 2, Fe2+ concentration of 0.5 mmol/L, gas flow rate of 120 L/h(O3 concentration 64 mg/L), and liquid flow rate of 20 L/h.3,The degradation of Acid Red B by 03/Fenton in RPB. The optimal H2O2:Fe2+ ratio and Fenton dosage were determined. The result showed that the optimal H2O2:Fe2+ ratio and Fenton dosage were determined as 10:1 and 1.0 mmol/L (Fe2+ concentration) respectively in the investigated system. Five different advanced oxidation processes (AOPs) were evaluated in terms of the decolorization rates and pH changes in the investigated system with liquid circulation. The result showed that 03/Fenton process has the largest reaction rate and decolorization percentage.