新型静态混合器强化臭氧水产生羟基自由基

Enhancing hydroxyl radical production in ozone waterby new type static mixer

目的:采用新型静态混合器强化臭氧气—液相传质。方法:考察不同臭氧气体流量、液体流量及液体温度对臭氧液相浓度和羟基自由基产生的影响,并与微孔曝气法和循环射流法进行对比。结果:随着气液流量的增大,臭氧水饱和浓度和羟基自由基浓度均增大;随着温度的升高,臭氧水饱和浓度降低,但羟基自由基浓度增大,当气体流量为2 L/min、液体流量为12 L/min、液体温度为10℃时,臭氧水质量浓度达到12.67 mg/L,臭氧水中羟基自由基浓度高达85.11μmol/L,其羟基自由基的产量较微孔曝气法和循环射流法分别提高了73.4%,20.6%。结论:新型静态混合器对臭氧水液相传质和羟基自由基的产生具有显著的强化作用。

Objective:A new type of static mixer to enhance the ozone gas-liquid phase mass transfer was established in this study.Methods:The effects of different ozone gas flow rates,liquid flow rates and liquid temperature on the concentration of ozone liquid phase and the generation of hydroxyl radicals were investigated,and were compared with the microporous aeration method and the circulating jet method.Results:With the increase of the gas-liquid flow rate,the ozone water saturation concentration and the hydroxyl radical concentration both increased;as the temperature increased,the ozone water saturation concentration decreased,but the hydroxyl radical concentration increased.With the gas flow rate at 2,the liquid flow rate at 12 L/min and the liquid temperature at 10℃,the saturated concentration of ozone water reached 12.67 mg/L,and the concentration of hydroxyl radicals in ozone water was 85.11μmol/L.The output of hydroxyl radicals was higher than that of microporous exposure.The air method and the circulating jet method increased by 73.4%and 20.6%,respectively.Conclusion:The new static mixer has a significant strengthening effect on the ozone-water liquid phase mass transfer and the generation of hydroxyl radicals.