Dissolved Air Floatation

A Technology For TSS / BOD / Petroleum from Water

Dissolved Air Floatation

 

D.A.F. - Dissolved Air Floatation

What is D. A. F. ?

Dissolved Air Flotation (DAF) systems are designed to remove suspended solids (TSS) , biochemical oxygen demand (BOD5), and oils and greases (O&G) from a wastewater stream. Contaminants are removed through the use of a dissolved air-in-water solution produced by injecting air under pressure into a recycle stream of clarified DAF effluent. This recycle stream is then combined and mixed with incoming wastewater in an internal contact chamber where the dissolved air comes out of solution in the form of micron-sized bubbles that attach to the contaminants. The bubbles and contaminants rise to the surface and form a floating bed of material that is removed by a surface skimmer into an internal hopper for further handling.

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.

Dissolved Air Floatation

Dissolved air flotation operates on the principal of the transfer of floc to the surface of water through Floating air bubbles in the water. The floc accumulated on the surface, known as the float, is skimmed off as sludge with countinuous process. The clarified water is removed from the bottom and is sometimes called the treated water. Since rain, snow, wind, freezing could cause problems with the float, flotation tanks must be fully enclosed in a building; some users enclose the flocculation tanks as well.

Like all clarification processes flotation performance depends on the effectiveness of coagulation and flocculation. Polyelectrolyte dosing is often included to compensate for reduced performance at low water temperature or if the floc is fragile. Although the process has been successfully used for some directly abstracted waters other clarification methods tend to be more suitable for treatment of such waters especially when the turbidity consistently exceeds about 100 NTU.

Key Features

Main Features of D.A.F.

Dissolved air flotation is one of our best product with high level technology for industries. Neotech Water Solutions is countinuously improves the quality of products with more and advance features. like ..

  • Complete, skid-mounted design available for ease of installation
  • Rectangular profile for maximum space utilization
  • Designed to stand with extreme environment
  • Superior performance with less inputs
  • An improved high level system which is both efficient and simple to use
  • Compact design to reduce space.
  • Removes high concentration of oil and suspended solids
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Case Study

Performance Of Dissolved Air Floatation

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We took waste water effected with polutant and treated with our DAF. Dissolved Air Floatation System worked well and we found the clear water, most of all floating floc have been removed and visibly clean.

How does it Work?

Dissolved air flotation (DAF) is a water treatment process that clarifies wastewaters 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.

DAF has major sections

  • Pressurised Air Bubble System
  • Floatation Tank
  • Under Flow Baffle
  • Outlet Weir

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