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CFD-based process optimization of a dissolved air flotation system for drinking water production.

K Satpathy1, U Rehman2, B Cools3

  • 1BIOMATH, Ghent University, Coupure Links 653, B-9000 Gent, Belgium; Current affiliation: Silicon Institute of Technology, 751 024, Bhubaneswar, Odisha, India E-mail: satpathy2011@gmail.com; kamalakanta.satpathy@silicon.ac.in.

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Summary

Dissolved air flotation (DAF) optimization was studied using computational fluid dynamics. Design modifications, like a perforated tube, improved performance by preventing floc loss, enhancing wastewater treatment efficiency.

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Area of Science:

  • Environmental Engineering
  • Fluid Dynamics
  • Water Treatment Technologies

Background:

  • Dissolved air flotation (DAF) is increasingly used for drinking and wastewater treatment.
  • The DAF process and its preceding flocculation step are complex and not fully understood.
  • Fluid dynamics are crucial for optimizing DAF system design and operation.

Purpose of the Study:

  • To perform a comprehensive computational analysis for optimizing the DAF treatment plant design in Kluizen, Belgium.
  • To investigate the multiphase flow dynamics within a scaled-down DAF model.
  • To propose and evaluate design modifications for improved system performance.

Main Methods:

  • Setting up a computational modelling framework for multiphase flow.
  • Conducting 3D numerical simulations on a scaled-down DAF model.
  • Validating the numerical model against experimental data for stratified flow.

Main Results:

  • Flow features were analyzed, providing confidence in the simulation.
  • Floc escape through the outlet was identified as a key issue affecting performance.
  • A modified design using a perforated tube for water extraction proved satisfactory.

Conclusions:

  • Computational fluid dynamics is a valuable tool for DAF system analysis and optimization.
  • Design modifications can effectively address performance limitations, such as floc loss.
  • The proposed perforated tube design enhances DAF efficiency and ease of maintenance.