How does a dissolved air flotation process for water clarification work?

Oct. 26, 2017

Wastewater is pumped into a dissolved air flotation system and mixed with a stream of recirculated clarified water. As these two stream mix together, microscopic bubbles attach to solid particulates, giving them enough buoyancy to go to the surface of the dissolved air flotation tank.

As solids accumulate in a floating layer of sludge on the top of the dissolved air flotation tank, a skimmer gently pushes the sludge toward a discharge tank or hopper.

Any solids that don’t float will sink to the “V” bottom of the dissolved air flotation tank. Settled solids are concentrated and discharged by an automatically controlled pneumatic drain valve.

The clarified water flows out via an under-over weir on either side of thedissolved air flotation unit. Some of this water is used in the recirculation loop while the rest flows out of the vessel for discharge or further treatment.

dissolved air flotation process for water clarification

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