DAF (Dissolved Air Flotation) system is a commonly used technology in wastewater treatment plants for the removal of suspended solids, oils, greases, and other pollutants. The system uses fine bubbles of compressed air to float the contaminants to the surface of the water, where they are removed by skimming.
In a DAF system, wastewater is first pretreated with coagulants and flocculants to help agglomerate the suspended solids and make them more buoyant. The water is then pumped into a flotation tank, where compressed air is introduced to create a layer of small bubbles. The bubbles attach to the agglomerated solids and float them to the surface, where a skimming mechanism removes them.
The clarified water then exits the flotation tank and moves on to further treatment, while the solids are collected and transferred to a sludge handling system for disposal. DAF systems are particularly effective at removing fine suspended solids, as well as fats, oils, and greases, and are widely used in industrial and municipal wastewater treatment applications.