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Dissolved Aerated Flotation

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 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 is very widely used in treating the industrial wastewater  effluents  from  oil refineries,  petrochemical  and  chemical plants,  natural gas processing plants, paper mills, general water treatment and similar industrial facilities. A very similar process known as  induced gas flotation  is also used for wastewater treatment.  Froth flotation  is commonly used in the processing of mineral ores.

In the  oil industry,  dissolved gas flotation  (DGF) units do not use air as the flotation medium due to the explosion risk.  Nitrogen gas  is used instead to create the bubbles.


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