Dissolved Air Flotation
VanAire offers a full range of equipment and technical service solutions for your DAF application. We exclusively offer rectangular DAF clarifier designs, utilizing stainless steel and non-metallic construction for long, trouble-free service.
What is Dissolved Air Flotation (DAF)?
DAF is a mechanical process using ultra-fine air bubbles to separate somewhat neutral or positively buoyant contaminates from water. These contaminates form nuclei on which microscopic air bubbles coalesce. The air bubbles add buoyancy to contaminates, causing them to float to the surface.
Our principles are simple. First, we create the finest, most effective bubbles for the removal of contaminates from industrial wastewater. Then, we introduce them properly to the wastewater stream to maximize the natural attraction of the bubbles to the contaminates.
Finally, we utilize chemical assistants such as coagulants or flocculants only when necessary; and only then for the purpose of precipitating and removing dissolved, emulsified, and colloidal contaminates. Our main contribution has been to eliminate the use of polymers and other chemical assistants that compensate for mechanical deficiencies in DAF equipment design and operation. VanAire’s wastewater pretreatment equipment helps our customers save money by reducing TSS, BOD, and FOG discharge levels, therefore reducing surcharges, increasing by-product recovery, reducing loads on lagoons and secondary treatment facilities, and preventing costly expansions of secondary treatment facilities.
A properly designed and operated DAF aeration/recycle system will generate bubbles that are so small that they are invisible turning the water in a flotation clarifier an intense white color. These bubbles will remain suspended in the water for several minutes, providing sufficient time for the bubbles to contact contaminates in the water.
Concurrent skimming allows the float to age and become more dense, reducing rendering, hauling and land application costs.