超声-Fenton工艺处理炼油碱渣废水的研究

摘要

采用超声-Fenton工艺处理炼油碱渣废水,探讨反应时间、n(H2 O2 )(Fe2+)、H2 O2浓度、初始pH值以及超声波功率等因素对炼油碱渣废水中酚和COD去除率的影响.研究结果表明,在反应温度为30℃、超声波频率为25 kHz时,超声-Fenton工艺处理碱渣废水的最佳工艺条件为:反应时间60 min、n(H2O2)(Fe2+)=30、H2 O2浓度293.7 mmol/L、pH值4.0、功率900 W,此时酚和COD的去除率分别达到87.4％和42.2％.此法的处理效果明显优于单一超声法和单一Fenton法.%Factors influencing the ultrasound-Fenton combined process for treating alkaline waste of refinery were investigated including the effects of n(H2O2 )(Fe2+) , H2O2 concentration, initial system pH value and ultrasonic frequency on the removal rates of phenol and COD. Test results showed that at constant reaction temperature of 30 °C and ultrasonic frequency of 25 kHz, under the optimum process conditions of a w(H2O2)/w(Fe2+) of 30,H2O2 concentration of 293. 7 mmol/L,initial system pH value of 4. 0,an ultrasonic power of 900 W and a reaction time of 60 min,the removal rate of phenol and COD by this combined process reached 87. 4% and 42. 2% respectively. Treatment by this combined process was much better than that of by single ultrasound method or single Fenton oxidation.