Dissolved air flotation machine because in decontamination operation is inseparable from the chemical, equipment processing need resistance to corrosion of the material to manufacture. In the use of corrosion-resistant materials, but also need to ensure that the use of mechanical equipment cycle time enough. And in dealing with the same time to avoid the breeding of bacteria. Bacterial production conditions are very simple, so when dealing with the need for a better way to deal with. Dissolved air flotation machine equipment using circulating water, coupled with the air mixture, to a certain extent, the formation of water soluble gas. Generally such water treatment, under the control of the control system, the formation of tiny bubbles, and finally the formation of a large surface area of the bubble water. This bubble water has a very strong adsorption capacity, the sewage treatment has a very good way to deal with. After treatment, the water can be treated by a series of particles, and then through the formation of the bubble after the suspension of the suspension. To achieve the results of recycling. The suspended solids adsorption of scum on the surface of water, are removed by foam scraper.