Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
BIOSUV group, Department of Chemical Engineering, University of Vigo, Isaac Newton Building, Campus As Lagoas Marcosende, 36310 Vigo, Spain.
Sci Total Environ. 2019 Jun 1;667:821-832. doi: 10.1016/j.scitotenv.2019.02.260. Epub 2019 Feb 22.
This study is focused on the selection of the best piping arrangement for a pilot scale annular channel reactor intended for the remediation of waters and wastewaters. Two annular channel reactors composed of a single UV lamp and distinct piping arrangements were considered: (i) a novel reactor with tangential inlet/outlet pipes - the FluHelik reactor, and (ii) a conventional Jets reactor. These two reactors were manufactured at lab scale and characterized in terms of residence time distribution (RTD), radiant power and ability to degrade aqueous solutions spiked with a model compound - 3-amino-5-methylisoxazole (AMI) - by HO/UVC and UVC processes. Computational fluid dynamics (CFD) simulations were used to assess the hydrodynamics, RTD and UV radiation intensity distribution of both reactors at pilot scale. In general, experimental results at lab scale revealed quite similar RTDs, radiant powers and AMI degradation rates for both reactors. On the other hand, CFD simulations at pilot scale revealed the generation of a helical motion of fluid around the UVC lamp in the FluHelik reactor, inducing: (i) a longer contact time between fluid particles and UV light, (ii) more intense dynamics of macromixing as a result of larger velocity gradients, turbulent intensities and dispersion of RTD values around the peak, and (iii) a more homogeneous UV radiation distribution. In addition, the design of the FluHelik reactor can favor the implementation of various reactors in series, promoting its application at industrial scale. The FluHelik reactor was chosen for scaling-up. A pre-pilot scale treatment unit containing this reactor was constructed and its feasibility was proven.
本研究专注于选择最佳的管道布置，用于中试规模的环形通道反应器，该反应器旨在修复水和废水。考虑了两种由单个 UV 灯和不同管道布置组成的环形通道反应器：（i）带有切线进出口管道的新型反应器 - FluHelik 反应器，和（ii）传统的 Jets 反应器。这两种反应器均在实验室规模下制造，并根据停留时间分布（RTD）、辐射功率以及通过 HO/UVC 和 UVC 工艺降解含有模型化合物 - 3-氨基-5-甲基异恶唑（AMI）的水溶液的能力进行了表征。计算流体动力学（CFD）模拟用于评估两种反应器在中试规模下的流体动力学、RTD 和 UV 辐射强度分布。一般来说，实验室规模的实验结果表明两种反应器的 RTD、辐射功率和 AMI 降解速率非常相似。另一方面，中试规模的 CFD 模拟揭示了 FluHelik 反应器中流体围绕 UV 灯产生螺旋运动，从而产生以下结果：（i） 流体颗粒与 UV 光的接触时间更长，（ii） 由于更大的速度梯度、湍流强度和 RTD 值的分散，宏观混合动力学更为剧烈，以及（iii）UV 辐射分布更加均匀。此外，FluHelik 反应器的设计可以有利于在系列中实施各种反应器，从而促进其在工业规模上的应用。选择 FluHelik 反应器进行放大。构建了包含该反应器的预中试规模处理单元，并证明了其可行性。
