Computational fluid dynamics simulation and parametric study of an open channel ultra-violet wastewater disinfection reactor

IF 2 Q3 Environmental Science

Water Quality Research Journal of Canada Pub Date : 2015-02-01 DOI:10.2166/WQRJC.2014.034

R. Saha, M. Ray, Chao Zhang

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引用次数: 6

Abstract

The disinfection characteristics of an open channel ultra-violet (UV) disinfection reactor is investigated numerically. The computational fluid dynamics (CFD) model used in this study is based on the volume of fluid (VOF) method to capture the water–air interface. The Lagrangian particle tracking method is used to calculate the microbial particle trajectory and the discrete ordinate (DO) model is used to calculate the UV intensity field inside the reactor. A commercial CFD software package ANSYS FLUENT is used to solve the governing equations. Custom user defined functions (UDFs) are developed to calculate the UV doses. A post-processor is developed in MATLAB to implement the inactivation kinetics of the microbes. The post-processor provides the probabilistic dose distribution and reduction equivalent dose (RED) values achievable in the reactor. The numerical predictions are compared with available experimental data to validate the CFD model. A parametric study is performed to understand the effects of different parameters on disinfection performance of the reactor. The low/high dosed particle trajectories, which can provide an insight for hydraulic and optical characteristics of the reactor for possible design improvements, are identified.

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明渠紫外线废水消毒反应器的计算流体动力学模拟及参数化研究

对明渠紫外线消毒反应器的消毒特性进行了数值研究。本研究使用的计算流体力学(CFD)模型是基于流体体积(VOF)方法来捕获水-空气界面的。采用拉格朗日粒子跟踪法计算微生物粒子运动轨迹，采用离散坐标(DO)模型计算反应器内紫外强度场。利用商用CFD软件ANSYS FLUENT求解控制方程。开发了自定义用户定义函数(udf)来计算紫外线剂量。在MATLAB中开发了一个后置处理器来实现微生物的失活动力学。后置处理器提供反应器中可达到的概率剂量分布和减少等效剂量(RED)值。将数值预测结果与实验数据进行了比较，验证了CFD模型的有效性。进行了参数研究，以了解不同参数对反应器消毒性能的影响。确定了低/高剂量粒子轨迹，这可以为反应器的水力和光学特性提供见解，为可能的设计改进提供依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Quality Research Journal of Canada WATER RESOURCES-

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Water Quality Research Journal publishes peer-reviewed, scholarly articles on the following general subject areas: Impact of current and emerging contaminants on aquatic ecosystems Aquatic ecology (ecohydrology and ecohydraulics, invasive species, biodiversity, and aquatic species at risk) Conservation and protection of aquatic environments Responsible resource development and water quality (mining, forestry, hydropower, oil and gas) Drinking water, wastewater and stormwater treatment technologies and strategies Impacts and solutions of diffuse pollution (urban and agricultural run-off) on water quality Industrial water quality Used water: Reuse and resource recovery Groundwater quality (management, remediation, fracking, legacy contaminants) Assessment of surface and subsurface water quality Regulations, economics, strategies and policies related to water quality Social science issues in relation to water quality Water quality in remote areas Water quality in cold climates The Water Quality Research Journal is a quarterly publication. It is a forum for original research dealing with the aquatic environment, and should report new and significant findings that advance the understanding of the field. Critical review articles are especially encouraged.