School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China E-mail:
Department of Environmental Engineering, Chonbuk National University, Chonbuk 561-756, Korea.
Water Sci Technol. 2021 Mar;83(5):1217-1229. doi: 10.2166/wst.2021.063.
The ultraviolet photochemical degradation process is widely applied in wastewater treatment due to its low cost, high efficiency and sustainability. In this study, a novel rotating flow reactor was developed for UV-initiated photochemical reactions. The reactor was run in a continuous flow mode, and the tangential installation of the inlet and outlet on the annular reactor improved reaction rates. Numerical modelling, which combined solute transport, radiation transfer and photochemical kinetic degradation processes, was conducted to evaluate improvement compared to current reactor designs. Methylene Blue (MB) decomposition efficiency from the modelling results and the experimental data agreed well with each other. The model results showed that a rotational motion of fluid was well developed inside the designed reactor for a wide range of inflow rates; the generation of ·OH radicals significantly depended on UV irradiation dose, and thus the degradation ratio of MB showed a strong correlation with the UV irradiation distribution. In addition, the comprehensive numerical modelling showed promising potential for the simulation of UV/HO processes in rotating flow reactors.
由于成本低、效率高和可持续性，紫外线光化学降解工艺在废水处理中得到了广泛应用。本研究开发了一种新型旋转流反应器，用于 UV 引发的光化学反应。该反应器以连续流动模式运行，环形反应器上入口和出口的切向安装提高了反应速率。数值模拟结合了溶质传输、辐射传递和光化学动力学降解过程，以评估与现有反应器设计相比的改进。亚甲蓝（MB）的分解效率来自模型结果和实验数据吻合较好。模型结果表明，在较宽的入口流速范围内，设计的反应器内流体的旋转运动得到了很好的发展；·OH 自由基的生成显著依赖于紫外线辐射剂量，因此 MB 的降解率与紫外线辐射分布有很强的相关性。此外，综合数值模拟为旋转流反应器中 UV/HO 工艺的模拟提供了有前途的潜力。
