Dissolved air flotation (DAF) is a water treatment process that clarifies wastewaters (or other waters) by the removal of suspended matter such as oil or solids. The removal is achieved by dissolving air in the water or wastewater under pressure and then releasing the air at atmospheric pressure in a flotation tank or basin. The released air forms tiny bubbles which adhere to the suspended matter causing the suspended matter to float to the surface of the water where it may then be removed by a skimming device.

Dissolved Air Flotation Clarifier is suited for wastewater streams containing solids, oils, and greases, which are difficult to settle or have a tendency to float. With proper chemical conditioning we remove colloidal and emulsified materials. Complete pretreatment systems can be supplied.

• High rate design 
• High removal efficiency 
• Meet effluent discharge requirements 
• Recovering suspended material 
• Reclaiming water for reuse 
• Thickening of slurries and sludges 

Dissolved Air Flotation (DAF) is a process for the removal of fine suspended material from an aqueous suspension. The term "flotation" indicates something floated on or at the surface of a liquid. 

The DAF provides the energy for effective flotation in the form of extremely fine air bubbles, which become attached to the suspended material to be removed. This attachment of bubbles to the particle "reduces" the density of the particle resulting in increased buoyancy, thus effecting flotation. Chemical conditioning is often used to increase the effectiveness of the dissolved air flotation process.

The most reliable and positive method of producing bubbles of the proper size is to dissolve air into water under pressure and to then reduce the pressure of the solution. As the pressure is reduced, the air comes out of solution in the form of microbubbles.

1. Wastewater is pretreated with chemicals. 
2. Treated influent is fed to DAF unit. 
3. Recycle is drawn off effluent line and is sent through the air dissolving system and then sent back into the DAF. 
4. Air is released from the recycle flow and the bubbles help to float solids in the DAF tank. 
5. Float is skimmed from the top of the tank. 
6. Clear effluent flows out of the unit.