The principle of air flotation technology is an efficient and fast method to separate solid particles from water and wastewater.

its working principle is that part of the treated wastewater circulates into the dissolved air tank. Under the condition of pressurized air, the air is supersaturated and dissolved, and then it is mixed with the raw water with flocculant at the entrance of the air flotation tank. Due to the pressure reduction, the supersaturated air is released, forming tiny bubbles, which quickly attach to the suspended matter and lift it to the surface of the air flotation tank.

As a result, a sludge floating layer which is easy to remove is formed, and heavier solid substances are precipitated at the bottom of the pond and also removed.

The air flotation tank has been widely used in the purification treatment of raw water with low turbidity, abundant algae, low temperature, high chroma and low dissolved oxygen, as well as in the wastewater treatment of various industries such as oil refining, paper making, printing and dyeing.

Extended data

According to the appearance, there are two types of air flotation tanks: circular air flotation tanks and rectangular air flotation tanks;

the circular air flotation tank is called super-effect shallow air flotation, which is the most advanced air flotation machine in the market. It mainly uses the shallow pool theory and the zero-velocity principle, and efficiently uses the internationally advanced micro-oxidation technology and high-density ion bubble technology, which changes the surface tension of water, improves the dissolved oxygen in water on a large scale, adsorbs a large number of short-chain organic molecules and colored groups in water, and makes a technical breakthrough in COD which is difficult to degrade both biochemically and physically.

The rectangular air flotation tank is a traditional air flotation process, which only uses a large number of bubbles to make the granular suspended matter float in the water, but it can't achieve the static floating effect in the operation process, and the effluent stability is generally poor.

Composition of air flotation cell

Generally, air flotation cell consists of flocculation chamber, bubble contact chamber and separation chamber. It has the functions of completing the formation and growth of flocs in water, the adhesion and capture of microbubbles to flocs, and the separation of flocs with air and water. In addition to the degassing flotation tank itself, other auxiliary facilities need to be combined with it, such as pressure degassing flotation tank, pressure degassing tank and dissolved gas releaser.

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