Dissolved Air Flotation (DAF)

Definition - What does Dissolved Air Flotation (DAF) mean?

Dissolved air flotation (DAF) refers to a water treatment process used to clarify water by incorporating oxygen, nitrogen and other gaseous molecules into the water under pressure. Dissolved air flotation devices may be prone to corrosion if not closely monitored and maintained due to their frequent contact with fluids.

Corrosionpedia explains Dissolved Air Flotation (DAF)

Dissolved air flotation facilitates the removal of suspended solids in wastewater that it is used to treat. This is done by injecting air into the water, which forms bubbles that adhere to any suspended material and brings them to the water's surface. Chemicals may be added to the wastewater processing tank to improve solid adhesion and recovery.

Dissolved air flotation is very effective for removing biological solids from wastewater. Key advantages include:

  • Small footprint
  • Fast implementation
  • High sludge solids content
  • Ability to recover floating bulk solids
  • Reliable effluent quality

The two main types of dissolved air flotation tanks are open tank and plate pack.

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