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'''Dissolved air flotation''' (DAF) is a [[water treatment]] process that clarifies [[wastewater]]s (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 or basin. The released air forms tiny bubbles which adhere to the suspended matter causing the suspended matter to float to the suface of the water where it may then be removed by a skimming device.<ref name=Aqueous>{{cite book | |||
|author=Beychok, Milton R. | |||
|title=[[Aqueous Wastes from Petroleum and Petrochemical Plants]] | |||
|edition=1st edition | |||
|publisher=John Wiley & Sons | |||
|year=1967 | |||
|id=[[Library of Congress Control Number|LCCN]] 67019834 | |||
}}</ref><ref>{{cite book | |||
|author=Lawrence K. Wang, Yung-Tse Hung, Howard H. Lo and Constantine Yapijakis | |||
|title=Handbook of Industrial and Hazardous Wastes Treatment | |||
|edition=2nd edition | |||
|publisher=CRC Press | |||
|year=2004 | |||
|id=ISBN 0-8247-4114-5 | |||
}}</ref><ref>{{Citation | |||
|editor-last =Kiuru | |||
|editor-first =H. | |||
|editor2-last =Vahala | |||
|editor2-first =R. | |||
|contribution =Dissolved air flotation in water and waste water treatment | |||
|title =International conference on DAF in water and waste water treatment No. 4, Helsinki, Finland | |||
|year =2000 | |||
|publisher =IWA Publishing, London | |||
|id = ISBN 1-900222-81-7 | |||
}}</ref> | |||
Dissolved air flotation is very widely used in treating the industrial wastewater [[effluent]]s from [[Oil refinery|oil refineries]], [[petrochemical]] and [[chemical plant]]s, [[Natural gas processing|natural gas processing plants]] and similar industrial facilities. A very similar process known as ''[[froth flotation]]'' is commonly used in the processing of mineral ores. | |||
== Process description == | |||
The feed water is to the DAF float tank is often (but not always) dosed with a coagulant (such as ferric chloride or aluminum sulfate) to flocculate the suspended matter. | |||
A portion of the clarified effluent water leaving the DAF tank is pumped into a small pressure vessel (called the air drum) into which compressed air is also introduced. This results in saturating the pressurized effluent water with air. The air-saturated water stream is recycled to the front of the float tank and flows through a pressure reduction valve just as it enters the front of the float tank, which results in the air being released in the form of tiny bubbles. The bubbles adhere to the suspended matter, causing the suspended mater to float to the surface and form a froth layer which is then removed by a skimmer. The froth-free water exits the float tank as the clarified effluent from the DAF unit.<ref name=Aqueous/> | |||
Some DAF unit designs utilize parallel plate packing material to provide more separation surface and therefore to enhance the separation efficiency of the unit. | |||
==References== | |||
{{reflist}} | |||
== External links == | |||
*[http://www.envirowise.gov.uk/page.aspx?o=166728#n2 DAF Application and design] | |||
*[http://www.h2flow.com/Website2003/Products/eimco/Dissolved%20Air%20Flotation%20(pg).pdf Dissolved Air Flotation] Eimco website provide excellent diagrams of DAF flotation systems | |||
*[http://www.rempec.org/admin/upload/publications/Activity%20B%20-%20Final%20Report%20Consolidated.pdf Treatment and Disposal of Ship-Generated Solid and Liquid Wastes] (Regional Marine Pollution Emergency Response Centre for the Mediterranean Sea, Project MED.B4.4100.97.0415.8, April 2004) | |||
Revision as of 01:01, 15 March 2008
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 or basin. The released air forms tiny bubbles which adhere to the suspended matter causing the suspended matter to float to the suface of the water where it may then be removed by a skimming device.[1][2][3]
Dissolved air flotation is very widely used in treating the industrial wastewater effluents from oil refineries, petrochemical and chemical plants, natural gas processing plants and similar industrial facilities. A very similar process known as froth flotation is commonly used in the processing of mineral ores.
Process description
The feed water is to the DAF float tank is often (but not always) dosed with a coagulant (such as ferric chloride or aluminum sulfate) to flocculate the suspended matter.
A portion of the clarified effluent water leaving the DAF tank is pumped into a small pressure vessel (called the air drum) into which compressed air is also introduced. This results in saturating the pressurized effluent water with air. The air-saturated water stream is recycled to the front of the float tank and flows through a pressure reduction valve just as it enters the front of the float tank, which results in the air being released in the form of tiny bubbles. The bubbles adhere to the suspended matter, causing the suspended mater to float to the surface and form a froth layer which is then removed by a skimmer. The froth-free water exits the float tank as the clarified effluent from the DAF unit.[1]
Some DAF unit designs utilize parallel plate packing material to provide more separation surface and therefore to enhance the separation efficiency of the unit.
References
- ↑ 1.0 1.1 Beychok, Milton R. (1967). Aqueous Wastes from Petroleum and Petrochemical Plants, 1st edition. John Wiley & Sons. LCCN 67019834.
- ↑ Lawrence K. Wang, Yung-Tse Hung, Howard H. Lo and Constantine Yapijakis (2004). Handbook of Industrial and Hazardous Wastes Treatment, 2nd edition. CRC Press. ISBN 0-8247-4114-5.
- ↑ Kiuru, H. & R. Vahala, eds. (2000), Dissolved air flotation in water and waste water treatment, International conference on DAF in water and waste water treatment No. 4, Helsinki, Finland, IWA Publishing, London, ISBN 1-900222-81-7
External links
- DAF Application and design
- Dissolved Air Flotation Eimco website provide excellent diagrams of DAF flotation systems
- Treatment and Disposal of Ship-Generated Solid and Liquid Wastes (Regional Marine Pollution Emergency Response Centre for the Mediterranean Sea, Project MED.B4.4100.97.0415.8, April 2004)