Dissolved Air Flotation (DAF)

This technology serves as a pre-treatment to remove fats or suspended solids in the industrial waste water, or to thicken the excess sludge. Prior to Dissolved Air Flotation (DAF) coagulation and flocculation are used to form larger floc particles in the waste water treatment stream.

How does DAF work?

Water and air are pressurized in the right proportion to create a supersaturated mixture. We call this 'sparkling water' or 'white water'. The mixture is injected into the treatment stream through the bottom of the flotation tank. This creates micro-bubbles that cause the floc particles in the tank to float up as a sludge layer. This layer is then thickened and scummed off.

DAF in the food industry


Activated sludge does not work if it contains waste water. The food industry frequently works with oil or other fat-rich products. It is therefore unwise to send its waste water directly to a water treatment plant with activated sludge.

DAF represents an economically and ecologically responsible choice in such cases. This technology removes high-fat waste substances from waste water quickly, cheaply and efficiently.


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