The pool surface is usually rectangular, flat or cone bottom. The outlet pipe is slightly higher than the bottom of the pool. A mud scraper and a mud collecting tank are installed on the water surface . Because the floating speed of the particles with bubbles is very fast, the volume of the air flotation tank is small, and the water retention time is only more than ten minutes. There are basically three ways of attaching suspended matter and bubbles in wastewater : ① bubbles are deposited on the surface of particles; ② bubbles and particles are adsorbed; ③ bubbles are entrapped in flocs. Whether the bubbles can effectively adhere to the suspended particles depends on the surface properties of the particles . If the particles are hydrophobic on the surface, air floatation should be used .

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