Dissolved Air Flotation system is a kind of commonly used solid-liquid separation equipment in the sewage treatment industry, which can effectively remove the suspended matter, grease, rubber substances in the sewage, and is the main equipment of the sewage preliminary treatment.

Flotation of solid is accomplished by introduction of microscopic air bubbles into the processing waster. As the bubbles rise, they attach to the particles in suspension and carry them to the surface for removing. DAF is an innovation combined with traditional dissolved air flotation concept and modern technology.

http://www.envset.com/Dissolved-Air-Flotation/DAF.shtml