The air flotation machine is a water treatment equipment that produces a large number of micro bubbles in the water by the dissolved air system, so that the air is attached to the suspended solids particles in the form of highly dispersed micro bubbles, resulting in a state of density less than that of water. It floats on the water surface by using the buoyancy principle, so as to realize the solid-liquid separation. The air flotation machine is divided into super efficiency shallow air flotation machine, vortex concave air flotation machine and advection air flotation machine. It is used in water supply, industrial wastewater and urban sewage treatment. The advantages of air flotation machine are that its solid-liquid separation equipment has the characteristics of low investment, small floor area, high degree of automation, convenient operation and management, etc.
Air flotation machine is a machine that uses small bubbles or tiny bubbles to make impurities in the medium surface. The air flotation device can be used for the fine particles whose specific gravity is close to that of water and whose self weight is difficult to sink or float up.
In terms of water supply and drainage, most of the pretreated water is light suspended particles, except for some raw water bodies with more sand and sewage with heavier mechanical impurities. For example, algae in lakes, reservoirs and some rivers; Plant residues and fine colloidal impurities; Dye particles in printing and dyeing industry; Short fibers in papermaking and chemical fiber industry; Droplets of petroleum and organic solvents in oil refining and chemical industry; Heavy metal ions in electroplating and pickling wastewater; Electrophoresis paint wastewater, etc; They are all light particles with a specific gravity very close to that of water. For these raw water, if the traditional sedimentation method is used, the effect is bound to be very poor, especially under the low temperature condition in winter, because of the deterioration of coagulation and hydraulic conditions, the treatment effect is more difficult to ensure. It is conceivable that if the flocs that are difficult to precipitate are forced to sink, it is bound to get half the result with twice the effort. It is better to take advantage of the situation by artificially introducing bubbles into the water to make them adhere to the flocs, so as to significantly reduce the overall density of flocs, and force them to float up by taking advantage of the rising speed of bubbles, so as to achieve rapid solid-liquid separation. In this sense, the emergence of air flotation technology is a revolution of gravity sedimentation method, which opens up a new field of solid-liquid separation technology.