DAF is a water & wastewater treatment system which remove contaminants like oil and suspended solids. In DAF system wastewater is treated by dissolving air in wastewater under pressure and then released at atmospheric pressure in a flotation tank basin. It is one of the most effective and versatile process in water treatment. Depending upon the type of filtration system DAF can be installed after pre-treatment or at initial. In some industries like oil & flammable gases, DAF unit use nitrogen as medium because as compared to air, nitrogen has less risk of explosion.