What is Dissolved Air Flotation?

Dissolved air flotation (DAF) is a method of treating waste water which involves separating oils, grease and solids. When pollution is caused mostly by suspended or dissolved matter, we recommend the installation of a Dissolved Air Flotation separation system.

DAF systems will thicken the sludge of wastewater and also allow for fast and efficient removal of the waste.

HowDoes It Work?

Chemicals such as aluminium chloride and iron chloride are often used to destabilise colloidal particles so that floc formation occurs. Flocculation with other chemicals, for example,polyelectrolate, enables larger masses to form that can easily be removed.

The process of dissolved air flotation involves production of minute bubbles which attach to the solids of the wastewater and bring these solids to the surface of the water. These solids, or sludge, can then be removed by a mechanical device designed to scrape the top of the water.

Next, the water exits the float tank as clarified effluent. DAF systems can be either circular or rectangular in shape. The dissolved air filtration process is very fast, saving your business time and money.

Recommended Uses for Dissolved Air Flotation Devices

Dissolved air flotation is usedin waste water treatmentfor separating fats and light inorganic solidsfrom industrial wastewater. Once this has been completed the water can then be recycled or reused, or treated further if required.

Usesof DAF’s include:

  • Pretreatment of sewerage to meet discharge limits
  • Removal of grease and silt from industrial water
  • Organic waste treatment
  • Treatment of drinking water

DAF treatment is commonly used in oil refineries as an oil water separator, in petrochemical plants, paper mills, chemical plants,food manufacturing factories, natural gas processing plants and various other industries. An approved industrial wastewater treatment expert can advise you on dissolved air flotation devices and the best and most efficient device to meet your business’s needs.


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