Dissolved Gas Flotation (DGF) Systems

Xylem provides systems that remove total suspended solids (TSS), biochemical oxygen demand (BOD), and oils and greases (O&G) from a wastewater stream. These systems include Dissolved Air Flotation (DAF), Dissolved Nitrogen Flotation (DNF) systems and systems which may contain the same components but utilize different gasses for certain applications, which comprise our line of Dissolved Gas Flotation (DGF) systems.

Using any of our DGF systems, contaminants are removed using a dissolved gas-in-water solution produced by injecting air under pressure into a recycle stream of clarified DGF effluent. This recycle stream is then combined and mixed with incoming wastewater in an internal contact chamber where the dissolved gas 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.

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