Dissolved Air Flotation (DAF) Systems

Dissolved Air Flotation is a proven and effective physical/chemical technology for treating a variety of wastewater streams

DAF systems are designed to remove total suspended solids (TSS), biochemical oxygen demand (BOD), and oils and greases (O&G) from a wastewater stream. Contaminants are removed using a dissolved air-in-water solution produced by injecting air under pressure into a recycle stream of clarified DAF effluent. This recycle stream is then combined and mixed with incoming wastewater in an internal contact chamber where the dissolved air comes out of the solution in the form of micron-sized bubbles that attach to the contaminants. The bubbles and contaminants rise to the surface and form a floating bed of material that is removed by a surface skimmer into an internal hopper for further handling.

Our DAF systems are used extensively in markets where water reuse is essential such as mining, oil and gas production. The use of Evoqua's DAF technology in produced water has resulted in millions of gallons of water being recycled. This cost-effective measure has reduced the need for freshwater in areas where finding freshwater is challenging, can be deployed quickly, and has helped to mitigate the environmental impact of deep well disposal.

In addition to capital sales our DAF systems are available as a rental service.