臭氧相关水处理工艺及其传质特征研究进展

Application of ozone for water treatment and implication of mass transfer characteristics

通过对臭氧的性质和不同的反应机理介绍,回顾了臭氧在水处理中的应用发展概况,并介绍了臭氧在实际处理应用中的设备的3个关键部分,包括臭氧发生器、臭氧接触反应系统和臭氧破坏装置。在工艺设计、活化及催化方法开发的基础上,臭氧在水中传质过程的优化也是技术创新的重要环节,所以本文阐述了臭氧的传质速率影响因素,而臭氧接触器是改善传质的具体工程手段。基于人们对臭氧传质过程的理解,逐渐对臭氧接触器进行了设计和改进,本文对几种典型类型的接触器的发展历程和研究现状进行了介绍,并且对其各自的传质特征研究进行对比与总结,结果得出大流量工况下静态混合器的体积传质系数K_(L)a高达2s^(-1),而小流量工况下射流式接触器和微气泡反应器的KLa可分别达到216.15s^(-1)和4000s^(-1),并且发现臭氧反应中仍有某些问题需要进一步研究,如气泡直径等参数可以多加注意和臭氧体系中的界面反应的进一步研究。

By introducing the properties and different reaction mechanisms of ozone,the application and development of ozone in water treatment are reviewed,and the three key parts of ozone treatment equipment are introduced,including ozone generator,ozone contact reaction system and ozone destruction device.On the basis of process design,activation and catalytic method development,the optimization of mass transfer process of ozone in water is also an important part of technological innovation.Therefore,the influencing factors of mass transfer rate of ozone are elaborated,and the ozone contactor is a specific engineering means to improve mass transfer.Based on people's understanding of the mass transfer process of ozone,ozone contactors are gradually designed and improved.In this paper,the development history and research status of several typical types of contactors are introduced,and their mass transfer characteristics are compared and summarized.The results show that the volumetric mass transfer coefficient KLa of static mixer can reach 2s^(−1),and the KLa of jet contactor and microbubble reactor can reach 216.15s^(−1) and 4000s^(−1) respectly under the condition of small flow rate.It is found that there are still some problems in the ozone reaction,such as the bubble diameter and other parameters can be paid more attention,and the interface reaction in the ozone system can be studied further.