Air flotation is a traditional process in the process of operation. During the operation, its work is mainly completed by four major parts: the dissolved gas process, the outgassing process, the contact and separation process of dissolved gas water and raw water.

The air flotation treatment method is effective to a certain extent to pass air into the wastewater, and to a certain extent, it precipitates out of the water in the form of tiny bubbles as a carrier, so that the emulsified oil, fine suspended particles and other pollutants in the wastewater adhere to On the bubbles, they float up to the water surface together with the bubbles to form a three-phase mixture of foam, water, and particles (oil). The purpose of separating impurities and purifying wastewater is achieved by collecting foam or scum. 

Air flotation is mainly used to treat emulsified oil or small suspended particles with a relative density close to 1 that are difficult to remove by natural sedimentation or floating in the wastewater. When the flocculate with air bubbles floats up in the water, it will be macroscopically affected by external forces such as gravity G buoyancy F.

When air flotation is in operation, the speed at which the air-carrying floccules rise can be derived from Newton's second law. To a certain extent, the floating speed of the equipment mainly depends on the density difference between water and air-carrying floccules. The diameter (or characteristic diameter) of the gas floccules and the temperature and flow state of the water.

In air flotation, if the proportion of bubbles in the air-carrying flocs is larger, the density of the air-carrying flocs is smaller, and the main characteristic diameter increases accordingly. This change between the two can greatly increase the floating speed. However, the actual flow of water; gas floc particles with different sizes, resistance is caused by changing an external force while changes also occur in flotation, the floating body and the velocity of the bubbles so formed are changing. 

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