Lei Han, Guan Xiaohong, Sun Yuankui, Yan Hexiang
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, China.
School of Ecological and Environmental Sciences, East China Normal University, Shanghai, China.
Water Environ Res. 2022 May;94(5):e10725. doi: 10.1002/wer.10725.
An increasing number of chemical technologies to wipe out contaminants within an incredibly short period of time have been developed recently, while their application was always hindered by the inefficient or improper mixing of reactants. To address this issue, the present work proposed a new static mixer named Tai-Chi which consists of blade, fin, and spoiler elements. Tai-Chi mixer can slice and divert the solutions inside and generate high shear flow to promote mixing process. Numerical simulations helped to determine the optimal operating conditions for Tai-Chi mixer, including laying its components anterior to the injection nozzles and keeping the velocity rate ratio of main pipe to branch pipe within the range of 0.5 to 1. Numerical simulations further proved that Tai-Chi mixer could strike a great balance between mixing performance (coefficient of variation [CoV] reaches 0.1 within 5 to 7 pipe diameters downstream) and head loss (nearly a half of other high shear static mixer in the market). Data of pilot-scale testing by Tai-Chi mixer confirm that 80% sulfamethoxazole could be eliminated in permanganate/bisulfite process within 8 pipe diameters, as well as showed the superiority of Tai-Chi's mixing performance in early stage compared with other static mixers in the market. PRACTITIONER POINTS: A Tai-Chi static mixer with blade, fin, and spoiler elements is devised. The optimal condition of flow rate and installment of Tai-Chi mixer is determined. Ultra-fast mixing is achieved by Tai-Chi (CoV < 0.1 within 5-7 pipe diameters). Pilot-scale test verifies the mixing efficiency of Tai-Chi mixer.
近年来，人们开发出了越来越多能在极短时间内消除污染物的化学技术，但其应用总是因反应物混合效率低下或不当而受到阻碍。为了解决这个问题，本研究提出了一种名为太极的新型静态混合器，它由叶片、翅片和扰流元件组成。太极混合器可以对内部溶液进行切割和分流，并产生高剪切流以促进混合过程。数值模拟有助于确定太极混合器的最佳运行条件，包括将其组件放置在喷嘴前方，并使主管与支管的流速比保持在0.5至1的范围内。数值模拟进一步证明太极混合器可以在混合性能（下游5至7个管径内变异系数[CoV]达到0.1）和水头损失（几乎是市场上其他高剪切静态混合器的一半）之间取得很好的平衡。太极混合器的中试测试数据证实，在高锰酸盐/亚硫酸氢盐工艺中，8个管径内可去除80%的磺胺甲恶唑，并且与市场上其他静态混合器相比，太极混合器在早期阶段的混合性能更优越。从业者要点：设计了一种带有叶片、翅片和扰流元件的太极静态混合器。确定了太极混合器的最佳流速条件和安装方式。太极混合器实现了超快混合（在5 - 7个管径内CoV < 0.1）。中试测试验证了太极混合器的混合效率。
