DAF™ Dissolved Air Flotation

Dissolved Air Flotation (DAF) systems remove suspended solids, fats, oils, greases and nonsoluble organics by a process of dissolving air into water under pressure. The process begins with the water to be treated entering the DAF through an influent header box that reduces velocity and distributes the water across the length of the vessel. In order to optimize treatment, the influent header box is designed with multiple points at which whitewater, a highly saturated pressurized stream of air and DAF effluent, and flocculant, where applicable, are injected. Wastewater then enters the flotation zone and microbubbles from the whitewater attach to the particle surface and affect the particle density, causing the suspended solids to float to the surface of the DAF where they are skimmed by a chain and flight and separated into the sludge hopper. The treated wastewater is continuously removed at several points inside the DAF and discharges over pipe weirs into an effluent chamber. From there, it flows out of the DAF.