High efficiency dissolved air flotation machine is mainly used for solid-liquid or liquid-liquid separation.  A large number of fine bubbles are generated in water through a dissolved and release gas system, in which the fine bubbles are adhered to solid or liquid particles in wastewater with similar density , so that the overall density of particles is less than that of water, and the fine bubbles are lifted to the water surface by buoyancy, thereby achieving solid-liquid or liquid-liquid separation.