UV chemical degradation is a low-cost and sustainable wastewater treatment technology that protects the environment. In this study, computational fluid dynamics (CFD), mass transfer, and photochemical kinetic models combined with the continuous flow mode of UV/H2O2 were applied for the photochemical reaction of internal airlift circulation photocatalytic reactor to improve the efficiency of the reaction. Results show that with the increase in gas flow rate, the turbulence intensity and internal circulation effect of liquid in the reactor can be enhanced under the condition of constant baffle spacing. The CFD simulation prediction results of the chemical components in the liquid flow show that H2O2 has a high correlation with the OH radical formation, which depends on the intensity of UV. Thus, the degradation rate of methylene blue (MB) has a high correlation with UV intensity. The degradation efficiency of MB is improved with the increase in gas velocity by comparing the experimental data with the numerical simulation data. The experimental data are generally lower than the numerical prediction data, and although a certain difference range is observed, the overall prediction results are better.

中文翻译：

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内气升循环光反应器中UV/H2O2过程的CFD建模

紫外线化学降解是一种保护环境的低成本、可持续的废水处理技术。本研究将计算流体动力学 (CFD)、传质和光化学动力学模型结合 UV/H2O2 的连续流动模式应用于内气升循环光催化反应器的光化学反应，以提高反应效率。结果表明，在挡板间距不变的情况下，随着气体流量的增加，反应器内液体的湍流强度和内循环效果得到增强。液流中化学成分的 CFD 模拟预测结果表明，H2O2 与 OH 自由基的形成有很高的相关性，这取决于 UV 的强度。因此，亚甲蓝 (MB) 的降解率与紫外线强度有很高的相关性。通过比较实验数据与数值模拟数据，MB的降解效率随着气体速度的增加而提高。实验数据普遍低于数值预测数据，虽然观察到一定的差异范围，但总体预测结果较好。