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  • Volume 50, Issue 1

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

Rajib Kumar Saha, Madhumita Ray, Chao Zhang
Published February 2015, 50 (1) 58-71; DOI: 10.2166/wqrjc.2014.034
Rajib Kumar Saha
Department of Mechanical and Materials Engineering, Western University, London, Ontario, Canada N6A 5B9 E-mail: czhang@eng.uwo.ca
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Madhumita Ray
Department of Chemical and Biochemical Engineering, Western University, London, Ontario, Canada N6A 5B9
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Chao Zhang
Department of Mechanical and Materials Engineering, Western University, London, Ontario, Canada N6A 5B9 E-mail: czhang@eng.uwo.ca
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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.

  • CFD simulation
  • open channel flow
  • UV disinfection
  • wastewater treatment
  • First received 8 October 2013.
  • Accepted in revised form 19 September 2014.
  • © IWA Publishing 2015
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Water Quality Research Journal: 53 (1)
  Volume 50, Issue 1

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Computational fluid dynamics simulation and parametric study of an open channel ultra-violet wastewater disinfection reactor
Rajib Kumar Saha, Madhumita Ray, Chao Zhang
Water Quality Research Journal Feb 2015, 50 (1) 58-71; DOI: 10.2166/wqrjc.2014.034
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Computational fluid dynamics simulation and parametric study of an open channel ultra-violet wastewater disinfection reactor
Rajib Kumar Saha, Madhumita Ray, Chao Zhang
Water Quality Research Journal Feb 2015, 50 (1) 58-71; DOI: 10.2166/wqrjc.2014.034

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  • Article
    • Abstract
    • NOMENCLATURE
    • INTRODUCTION
    • CONFIGURATION OF THE UV REACTOR
    • MODEL DESCRIPTION
    • GRID GENERATION
    • BOUNDARY CONDITIONS AND NUMERICAL SOLUTION TECHNIQUE
    • GRID INDEPENDENT TEST
    • CFD MODEL VALIDATION
    • EFFECT OF FLOW RATE ON THE FREE SURFACE PROFILE
    • EFFECT OF FLOW RATE AND UV SENSITIVITY ON THE DISINFECTION PERFORMANCE
    • EFFECT OF WATER UVT ON THE DISINFECTION PERFORMANCE
    • VISUALIZATION OF THE UV RADIATION INTENSITY DISTRIBUTION AND PARTICLE DOSES
    • CONCLUSION
    • ACKNOWLEDGEMENTS
    • REFERENCES
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Keywords

CFD simulation
open channel flow
UV disinfection
wastewater treatment
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