膜接触反应器臭氧传质及其对模拟印染废水的降解

Using a membrane contactor for ozone mass transfer study and model dye wastewater treatment

对膜接触反应器传质过程及其在模拟印染废水降解中的应用进行了研究。实验表明,产水臭氧浓度随着液相雷诺数、气相臭氧浓度和膜长的增加而升高,随着温度升高而下降。在膜接触反应器中,臭氧体积传质系数kLa可达0.317s^(-1),比鼓泡反应器大15~62倍。对模拟印染废水的降解速率常数ka可达0.336 s^(-1),比鼓泡反应器大65%,而比臭氧消耗量为鼓泡反应器的45%。实验表明,膜接触反应器具有体积较小,臭氧利用效率较高等优势。

In this work,the mass transfer principles and dyestuff treatment in a membrane contactor were studied. The results indicated that the ozone concentration in the outlet water was promoted by its Reynolds number,ozone concentration in gas phase,and membrane length,while it was restrained by temperature. The mass transfer coefficient kLa was 0. 317 s^-1,which was 15 to 62 times greater than that of the bubble contactor. The degradation rate coefficient of the model dyestuff was 0. 336 s^-1,which was 65% greater than that of the bubble contactor,while the ozone consumption rate was 45% lower. The results indicated that the membrane contactor was smaller in size and had a higher ozone utilization efficiency compared to traditional contactors.