Dissolved air flotation system is an advanced equipment combined flotation and settling functions. High surface loading, short retention time and shallow water depth were uniqueness of this system compared to the conventional designs.

Theory
The air is pressurized to be dissolved in the air dissolving tube，and the fine bubbles will be released when it is discharged into the open basin.
The diameter of fine bubble is 1um approximately and the flotation velocity is about 15cm/min.The  floc in the solution will be attached by fine bubbles and floated to the top of water. The  flotation process will be completed within 3 minutes and consistency of buoyant sludge is 2-3% solid content.