A systematic study of enhanced ozone mass transfer for ultrasonic-assisted PTFE hollow fiber membrane aeration process
A systematic study of enhanced ozone mass transfer for ultrasonic-assisted PTFE hollow fiber membrane aeration process
复制标题
DOI：
10.1016/j.cej.2018.09.188
复制
发表时间：
2019-02
影响因子：
15.1
通讯作者：
B. Wang;Xingaoyuan Xiong;Yiyu Shui;Zhiyu Huang;K. Tian
中科院分区：
文献类型：
--
作者：
B. Wang;Xingaoyuan Xiong;Yiyu Shui;Zhiyu Huang;K. Tian
研究了聚四氟乙烯中空纤维膜曝气和超声波辅助聚四氟乙烯中空纤维膜曝气过程中基于去离子水的臭氧传质效率，并用传质系数（KLa）来描述。还通过图像技术研究了气泡尺寸分布，以分析传质过程。所有PTFE中空纤维膜都是疏水性的并且具有不对称结构。结果表明，单膜曝气系统中1#膜（0.22μm）在进水流量为300L/h时获得最大KLa值（0.438min−1）。这种气液传质强烈依赖于压力。引入超声波功率后，超声波功率为1000W时，KLa值达到0.632min−1，这种增强与本体溶液与高浓度臭氧液体界面处局部液体的周期性更换有关。磺化酚醛树脂（SMP）的降解证实了其矿化是通过臭氧增强的气液传质和本体溶液中自由基dotOH的生成而促进的。
The ozone mass transfer efficiency based on deionized water of both the PTFE hollow fiber membrane aeration and ultrasonic-assisted PTFE hollow fiber membrane aeration processes have been studied and described by mass transfer coefficient (KLa). Bubble size distributions were also investigated via an image-technology to analyze mass transfer processes. All the PTFE hollow fiber membranes were hydrophobic and had an asymmetrical structure. Results showed that the maximum value of KLa (0.438 min−1) was obtained at an intake flow rate of 300 L/h with 1#membrane (0.22 µm) in single membrane aeration system. This gas-liquid mass transfer was strongly dependent on pressure. After the introduction of ultrasonic power, the KLa value reached 0.632 min−1with an ultrasonic power of 1000 W. This enhancement was related to the periodical replacement of local liquid at the interface between the bulk solution and the liquid with high concentration of ozone. The degradation of sulfonated phenolic resin (SMP) confirms that its mineralization was promoted by the enhanced gas-liquid mass transfer of ozone and the generation of radical dotOH in the bulk solution.