In terms of water supply and drainage, the pre-treatment water quality, except for some raw water bodies with more sand and sewage with heavy mechanical impurities, is mostly composed of lightweight suspended particles. For example, algae in lakes, reservoirs, and some rivers; Plant residues and small colloidal impurities; Dye particles in the printing and dyeing industry; Short fibers in the papermaking and chemical fiber industries; Microdroplets of petroleum and organic solvents in the refining and chemical industries; Heavy metal ions in electroplating and pickling wastewater; Electrophoretic paint wastewater, etc; They are all lightweight particles with a density very close to that of water. For these raw water, if traditional sedimentation methods are used, the effect will inevitably be poor, especially under low temperature conditions in winter. Due to the deterioration of coagulation and hydraulic conditions, the treatment effect is more difficult to ensure. It can be imagined that if flocs that are difficult to settle are forced to sink, it will be twice the result with half the effort. Instead, it is better to use the situation to artificially introduce bubbles into the water, making them adhere to the flocs, thereby greatly reducing the overall density of flocs, and using the speed of bubble ascent to force them up, in order to achieve rapid solid-liquid separation. In this sense, the emergence of air flotation technology is a revolution in the gravity settling method, which has opened up new fields of solid-liquid separation technology.

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