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. Air flotation is an alternative to precipitation. There are two commonly used methods for generating microbubbles: aerated air floatation and dissolved air floatation. In addition, the electrolysis method is not commonly used. 

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