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    The commonly used types of air flotation machines for sewage treatment are as follows. 

    1. Dissolved air flotation machine: The dissolved air flotation machine adopts a new and efficient dissolved air equipment - microbubble generator, which replaces traditional air introduction equipment to dissolve air into water. Several inclined tube groups are installed in the air flotation area, including a box, scraper, and spiral discharge machine, to form a complete air flotation water purification device. 

    2. Shallow air flotation machine: In the process of water supply and drainage treatment, solid liquid separation technology and its equipment are one of the key processes of shallow air flotation machine. Air flotation is an effective method for removing small suspended particles with a density close to water. The shallow air flotation machine has been successfully designed using the "shallow pool theory" and the "zero speed" principle, integrating flocculation, air flotation, slag skimming, sedimentation, and mud scraping. It is an efficient and energy-saving water purification equipment. Widely used in water supply and drainage treatment engineering. 

    3. Vortex concave air flotation machine: Vortex concave air flotation machine is used to remove solid suspended solids, oils, gelatinous substances and other impurities in industrial and urban sewage. With the help of chemical flocculants, SS and COD in wastewater can be greatly reduced. In the paper industry, this machine can be used for the treatment of white water and intermediate wastewater such as de ink wastewater. 

    On the one hand, it can recover fibers, and on the other hand, it can reuse or discharge the treated wastewater in compliance with standards, greatly reducing the pressure on environmental protection.