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Related Experiment Videos

Separation characteristics in dissolved air flotation--pilot and full-scale demonstration.

M Ljunggren1, L Jönsson

  • 1Department of Water and Environmental Engineering, Lund Institute of Technology, P.O. Box 118, 221 00 Lund, Sweden. Michael.Ljunggren@vateknik.lth.se

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 2, 2003
PubMed
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Particle separation in Dissolved Air Flotation (DAF) primarily occurs upstream. Larger particles are more effectively removed by the DAF process, improving water treatment efficiency.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Particle Science

Background:

  • Dissolved Air Flotation (DAF) is a crucial process for water purification.
  • Understanding particle separation dynamics within DAF is essential for optimizing its efficiency.
  • Current knowledge gaps exist regarding the precise location and size-specific removal of particles in DAF systems.

Purpose of the Study:

  • To pinpoint the specific zones within the DAF process where particle separation occurs.
  • To identify the range of particle sizes effectively removed by DAF.
  • To provide practical insights for enhancing particle separation in DAF.

Main Methods:

  • Investigation of both pilot- and full-scale Dissolved Air Flotation plants.
  • Utilisation of a light-blocking particle counter for precise particle size analysis.

Related Experiment Videos

  • Employing an optical borescope for visualising particle-bubble aggregate formation.

    • Main Results:

    • Particle separation is predominantly observed in the upstream sections of the DAF process, near the initial contact zone.
    • The efficiency of particle removal by DAF demonstrates a positive correlation with increasing particle size.
    • Visualisation confirmed the aggregation of particles with bubbles as a key separation mechanism.

    Conclusions:

    • Optimizing DAF performance can be achieved by focusing on upstream process conditions.
    • DAF is particularly effective in removing larger suspended particles from water.
    • This study offers valuable data for refining DAF operational strategies and design for enhanced particle removal.