DAF - Dissolved Air Flotation

Efficient Dissolved Air Flotation (DAF)

DAF systems are designed to remove total suspended solids (TSS), biochemical oxygen demand (BOD), and oils and greases (O&G) from a wastewater stream. Contaminants are removed using 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 the 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.

How Dissolved Air Flotation Works:

Air Dissolution: Air is pressurized and injected into a portion of the treated water (recycle stream). This creates a solution saturated with air.
Mixing: The air-saturated recycle stream is then mixed with the incoming wastewater in a contact chamber.
Bubble Formation: As the air escapes from the solution, it forms tiny bubbles. These micron-sized bubbles adhere to contaminants in the wastewater.
Flotation: The bubbles carry the contaminants to the surface of the water, forming a frothy layer.
Skimming: A surface skimmer removes the floating contaminants, which are then collected in a hopper for further processing or disposal.

Benefits of Dissolved Air Flotation:

Efficient Removal: Effectively separates suspended solids, oils, and greases from water.
Compact Design: Requires less space compared to some other treatment methods.
Versatile: Suitable for a wide range of wastewater types and industries.

Dissolved air flotation is widely used in industries like food and beverage, pulp and paper, and municipal wastewater treatment for its ability to enhance water quality and ensure compliance with environmental regulations.

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