The working principle of air flotation machine in wastewater treatment is mainly based on the flotation principle. By introducing a large number of tiny bubbles into the wastewater, these bubbles attach to suspended solid particles in the wastewater, thereby changing the density and buoyancy of the particles, making them float to the water surface. Then, these floating slag are removed by a scraper device to achieve solid-liquid separation. The specific steps are as follows:

Dissolving process: Firstly, the air flotation machine pressurizes the air through a dissolving pump and dissolves it in water to form dissolved air water. Dissolved gas water contains a large number of fine bubbles, with diameters typically ranging from 20 to 100 micrometers.

Release dissolved water: Then, release the dissolved water into the wastewater through a release device. During the release process, due to the sudden decrease in pressure, bubbles in the dissolved water will rapidly expand and release, forming a large number of tiny bubbles.

Attachment of bubbles and suspended particles: Suspended particles in wastewater are prone to contact and adhere to bubbles due to surface tension. This adhesion effect reduces the density of suspended particles, thereby increasing their buoyancy.

Floating separation: Suspended particles with attached bubbles begin to float to the surface due to an increase in buoyancy. This process usually requires a certain amount of time for bubbles and suspended particles to have enough time to come into contact and adhere.

Scraping slag removal: When suspended particles float to the water surface, a layer of floating slag will be formed. These floating slag are scraped off from the water surface by a scraper device (such as a rotating scraper or a chain scraper), and then discharged from the system through the slag discharge outlet.

Clear water discharge: After air flotation treatment, the suspended solids content of the clear water is significantly reduced, which can meet the discharge standards or further treatment needs.

The working principle of air flotation machine is simple and efficient, especially suitable for removing light suspended solids such as oil, fiber, algae, etc. from wastewater. Compared with traditional sedimentation tanks, air flotation machines have the advantages of small footprint, high treatment efficiency, and easy operation.

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