DAF dissolved air flotating water treatment equipment

Dissolved Air Flotation (DAF) Clarifiers

In a DAF clarifier, microscopic air bubbles are produced and mixed with the incoming wastewater. The air bubbles attach themselves to the contaminants, which gives them buoyancy. The buoyant mixture of particles and air bubbles float to the surface and are removed by a skimming mechanism.

Air bubble production is achieved by pressurizing a portion of the clean effluent and recycling it back to the influent to be mixed with the waste stream. As the super saturated water enters the DAF the pressure is removed and millions of microscopic air bubbles are produced. The bubbles become entrained in the solids, rise to the surface and form a bed of material that is skimmed into an isolated chamber.

     The effluent quality of a DAF is greatly improved with chemical pre-treatment. Our Snake-Blend™ and CAT systems offer the latest in design technologies. Removal rates for FOG and TSS are typically 95% to 97% with proper chemical pretreatment.

     The Snake-Blend system is an effective way to introduce and mix a chemical recipe using water turbulence in a series of winding pipes. The design features winding, clog free mixing zones for ideal mixing of the chemistry. The design is compact and has no moving parts.

    The Chemical Addition Tank (CAT) system is designed based on flow and retention time. They are typically used when greater contact time and mixing are required to effectively mix the chemistry. The systems are custom designed to match the flow requirement of the DAF and are offered in A-36 carbon, 304 or 316 stainless steel. Mixers and chemical pumps are supplied as standard.