DAF is an alternative clarification process that uses micro air bubbles to attach and float flocculated particles and suspended solids to the water surface for removal.In contrast, sedimentation removes settled solids from the bottom.

Before the flocculated water enters the clarification chamber, millions of tiny air bubbles are released from the diffuser nozzles to the water, which attach and float the floc particles to the water surface. The air bubbles are generated in a pumped recycle stream by an air compressor and are dissolved in water through a packed-tower-type of saturator. The floated sludge is removed periodically to a desludging trough, and the clarified water flows to the bottom of the clarifying chamber and then to an effluent control weir for collection. The air saturator is used to dissolve air in the water and then generate bubbles to float the floc particles.

By the compressor,the air will be sent into air tank.Then it will be taken in air dissolved tank by jet flow device.In the dissolved tank,the air will be liquefied under 0.35Mpa pressure.Then the liquefied are will be sent to air flotation tank.When released suddenly, the air will be dissolved out and turn into a microbubble group.The group will meet the flocculating suspension in the sewage which is sent by pump and already medicated.It will be absorded in the flocculated suspension while slowly rising up.Along with reduction of the suspension's density,the suspension will go up to the water surface.Finally,the SS and CODcr will be removed. 

One of the most common DAF applications is for the pretreatment of wastewater to remove suspended solids and oils and greases prior to discharge to a municipal sewer or a biological treatment system. For example:

Qingdao Yimei Environment Project Ltd. is found in 1988.We are located in the largest port city-Qingdao China. Our factary take up 36,000 square metres and there are more than 130 kinds machine for manufacturing. As a member of Shandong Province Environmental Protection Industrial Association, we have 360 staff and  72 experienced engineers.

Our main product is the equipment for Environment Protection and Waste Water Treatment.And the product is popular all over the world,such as Africa, North America,Domestic Market,Eastern Asia,Mid East.