A systematic simulation of disinfection for the flow-through UV reactors with staggered ring baffles under the Eulerian framework

迷惑 流量(数学) 停留时间(流体动力学) 停留时间分布 平均流量 材料科学 体积流量 混合(物理) 航程(航空) 机械 工程类 湍流 物理 复合材料 热力学 岩土工程 量子力学
作者
Jiming Wu,Baoqing Deng,Xiaonan Zou,Jiajia Luo
出处
期刊:Journal of water process engineering [Elsevier BV]
卷期号:52: 103598-103598
标识
DOI:10.1016/j.jwpe.2023.103598
摘要

An integrated UV disinfection model is presented to simulate the disinfection in the flow through UV reactors. The concentration of microorganisms, the mean residence time, and the mean dose are solved under the Eulerian framework. An unbaffled reactor and three baffled reactors with staggered baffles are simulated. The accuracy of the computation is validated against Sozzi's measurement and simulation in the unbaffled reactor. The staggered baffles improve the flow field and enhance the mixing. The mean residence time is significantly changed by baffles. The cumulative frequency distributions of the mean residence time in the outlet plane may become narrow and wide depending on the size of baffles. The radiation intensity is nearly the same for all reactors. The mean dose is significantly affected by the baffles. The area-averaged mean doses at the outlet are nearly the same for all reactors whereas the range of the mean dose in the outlet plane is narrowed by baffles. Better disinfection levels are obtained in the baffled reactors than the unbaffled reactor, which is determined by the narrower distribution of the mean dose in the outlet plane. The increasing flow rate decreases the disinfection level for all reactors. The reduction equivalent dose is proportional to the minimum mean dose Dmin in the outlet plane and the slope decreases as the inactivation constant increases, meaning a decreasing effect of Dmin on the reduction equivalent dose. Dmin in the outlet plane can be used to characterize the disinfection capability of the flow-through UV reactors.
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