Air flotation is an abbreviation of air flotation machine, and it can also be used as a proper term, that is, air flotation in water treatment is to form highly dispersed tiny bubbles in water and adhere to the solid or liquid of the hydrophobic base in the wastewater. The particles form a water - gas - particle three-phase mixed system. After the particles adhere to the bubbles, they form flocs with an apparent density less than water and float to the water surface, forming a scum layer that is scraped off, thereby realizing solid-liquid or liquid-liquid separation process. Air flotation is to produce a large number of fine bubbles in the water, and the fine bubbles adhere to the small suspended particles in the wastewater. A composite of " bubble particles " with an overall density less than water is formed . The suspended particles rise to the surface of the water together with the bubbles to form foam scum, so that the suspended matter in the water can be separated.

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