DAF (Dissolved Air Flotation)

DAF, or Dissolved Air Flotation, is a physicochemical treatment method used in wastewater treatment. It is particularly used for the removal of oil, grease, suspended solids, and certain organic substances from water.

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How Does a DAF System Work?

  1. Chemical Coagulation & Flocculation: Coagulants (typically alum or iron salts) and flocculants are added to the wastewater to help small particles bind together.
  2. Dissolving Air in Water: Treated water is saturated with air under high pressure and then directed to the system inlet.
  3. Sudden Pressure Drop: The pressurized, air-saturated water experiences a sudden pressure drop upon entering the DAF tank. This causes the dissolved air to form microscopic bubbles.
  4. Flotation: The air bubbles attach to waste particles and carry them to the surface.
  5. Surface Skimming: The foamy sludge layer accumulated on the surface is removed using skimmers. The clarified water underneath exits the system.

Applications:

  • Food industry (meat, dairy, fish processing)
  • Greasy wastewater
  • Chemical and petrochemical industries
  • Textile and paper industries
  • Sludge thickening in treatment plants

Advantages of DAF Systems:

  • High-efficiency solid removal in a short time
  • High oil and grease removal rates
  • Optimized chemical consumption
  • Compact and modular design possibilities
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