超声-Fenton高级氧化降解淀粉废水的研究

Research on Degradation of Starch Wastewater by Ultrasonic-Fenton Oxidation Process

采用超声与Fenton高级氧化技术联合处理实际高浓度玉米淀粉废水,超声波与Fenton试剂联合作用时,在超声波的作用下,极短时间(<10μs)内形成空化气泡会发生空化现象.由于玉米淀粉浓度较高,在超声作用时有机物更容易发生碰撞,产生较多的自由基,使玉米淀粉废水中的有机物得到降解.最终达到较好的去除效果.通过单独超声实验得到最佳的超声时间为150 min,超声波频率为45 kHz,超声波功率为200 W,pH值为3;通过超声与超声-H2O2联合的对比实验,得出H2O2最佳投加量为40 mmol/L;通过单独加入Fenton试剂与超声-Fenton联合的对比实验,得出FeSO4最佳投加量为8 mmol/L.在最佳参数条件下,超声-Fenton法处理高浓度玉米淀粉废水,其COD去除率可达到92%.

Corn starch wastewater belongs to high concentration organic wastewater. This experiment uses the ultrasound with senior Fenton oxidation technology processing. With the joint action of ultrasound and Fenton reagent,under the action of ultrasonic wave,cavitation phenomenon will happen with the formation of cavitation bubble in a very short time（ 〈 10 μs）. Because corn starch concentration is higher,in the ultrasonic action, organic matter are more likely to collide,then produce more free radicals which make the organic matter of the corn starch wastewater degraded. Ultimately it achieves better removal effect. Through the single ultrasonic experiment,the best ultrasonic time of 150 min,ultrasonic frequency of 45 kHz,ultrasonic power of 200 W,pH value of 3 are obtained. By ultrasound and ultrasound-H2 O2 joint contrast experiment,the optimum dosing amount of H2 O2 is 40 mmol/ L. Through a separate join Fenton reagent and the contrast experiment of ultrasonic-Fenton joint,the optimum dosing amount of FeSO4 is 8 mmol/ L. Under the condition of optimum parameters,using ultrasonic-Fenton treatment of high concentration of corn starch wastewater,the COD removal rate can reach 92. 0% .