Dissolved Air Flotation (DAF)

Dissolved air flotation plants are suitable for industrial effluent as well as domestic sewage.

The use of a full or partial pressurisation system depends on the type of waste liquor being treated for example, an industrial effluent may require full pressurisation whilst activated sludge thickening may only require partial pressurisation.

Factors that need to be considered include particulate matter concentration and solids loading rate.

The efficiency of the process is determined by the size, number and velocity of the air bubbles and the effectiveness of the surface skimming system.

Dissolved air flotation is a continuous process, but as it is not a biological one it can be shut down for a period of time when there is no sludge to process.