Flotation (DAF)

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Flotation for WTPs (DAF)

For:water treatment plants, waste water treatment plants


Dissolved Air Flotation (DAF) is a separation process that is included as the first separation stage in the drinking water treatment process or when cleaning various waste water types.

Flotation Principle

Suspended substances (flakes, particles, organisms) join the air micro-bubbles in the contact zone to be brought up to the level in the separation zone where they form floating layer of a sludge foam removed in the hydraulic or mechanical manner.

Rising velocities of the aggregates created this way are higher by one or two orders than the original sedimentation velocities of these flakes. As compared to the sedimentation process , this enables work under the high surface flotation load.


  • Compact dimensions
  • High separation efficiency
  • Efficient and cost-effective operation
  • High percent of the sludge dry matter
  • Installation into steel or concrete tanks
  • Optional installation even into the existing single-stage treatment plants that have flocculation reactors of sufficient dimensions
  • Lower investment and operational costs for the consequent separation stage (filtering, membranes)


  • High surface load value (up to 10x higher than in the sedimentation tank and clarifier)
  • High separation efficiency even in poorly settleable particles (small particles of a density that is close to the water density, for example, organisms)
  • Better quality of treated water
  • Reduced loading of the next separation stage
  • Quick start-up of flotation while flotation is shut down
  • Easier processing of sludge waters