Dissolved Air Flotation system is an advanced wastewater treatment used mostly in the industrial sector in the country to treat wastewater algae, organics, oil and grease. It is very efficient for the reduction of Chemical Oxygen Demand (COD) present in fat, grease, oil, biological sludge, coloured organic matter, and colloidal material. It is also excellent for removing oil and grease from industrial wastewater, as mentioned. http://www.ysle-et.com/horizontal-daf/dissolved-air-flotation-systems.html