双频超声-臭氧氧化处理含对硝基苯胺和硝基苯的废水

Treatment of Wastewater Containing p-Nitroaniline and Nitrobenzene by Bi-frequency Ultrasonic Enhanced Ozonation Process

分别采用单独臭氧氧化、单频超声协同臭氧氧化、双频超声协同臭氧氧化处理含对硝基苯胺和硝基苯的废水。实验结果表明,双频超声协同臭氧氧化处理废水的效果明显优于单频超声协同臭氧氧化和单独臭氧氧化。在废水初始pH为11、臭氧流量为30 mg/min、反应时间为50 min、HT-50型超声波发生器功率为50 W、NXG-S型超声波发生器功率为110 W的最佳条件下,COD、对硝基苯胺和硝基苯的去除率分别为96.4%、99.8%和98.8%。处理后水质达到GB8978—1996《污水综合排放标准》的一级排放标准。

The wastewater containing p-nitroaniline and nitrobenzene was treated respectively by processes of ozonation, frequency ultrasonic enhanced ozonation and bi-frequency ultrasonic enhanced ozonation. The experimental results show that the treatment effect by hi-frequency ultrasonic enhanced ozonation process is the best. Under the optimum conditions of initial wastewater pH 11, ozone flow 30 mg/min, reaction time 50 rain, power of the HT-50 ultrasonic generator 50 W , power of the NXG-S ultrasonic generator 110 W, the removal rates of COD, p-nitroaniline and nitrobenzene are 96.4%, 99.8% and 98.8% respectively. The water quality of the effluent can meet the first grade discharge standards of GB 8978 - 1996.