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Introduction
The air flotation apparatus is a water treatment apparatus which causes the suspended matter to adhere to the water and rises to the surface of the water, thereby separating the water and the suspended matter. But also to the surface of the water surfactant attached to the surface of the bubble floating, and thus separated from water, known as the bubble air float method. The equipment used in the float process consists of an air float pool and a bubble-generating accessory that completes the separation process. In the water treatment, the air floatation method can be used in the case where the precipitation method is not suitable to separate the suspended matter close to the water and difficult to precipitate, such as grease, fiber, algae and so on, and can also be used to concentrate the activated sludge.

working principle
Air flotation water is in the case of high pressure, so that the water into a large number of gas for the working fluid, in a sudden decompression, the release of numerous fine bubbles and mixed with impurities in the water after mixing together, so that the proportion of less than 1, and floating on the liquid surface, the formation of foam (gas, water particles) mixture, so that contaminants from the separation of waste water to achieve the purification effect.

Applications
Air flotation machine is mainly used for solid - liquid or liquid - liquid separation. Through the dissolved gas and the release system in the water to produce a large number of fine bubbles, so that the adhesion of water in the density of water close to the solid or liquid particles, resulting in the overall density of less than the state of water, and rely on buoyancy to rise to the surface, so To achieve solid - liquid or liquid - liquid separation purposes. In the field of water treatment, air flotation machines are used in the following areas:
1. To separate smll suspended solids and alga in surface water.
2. In recycling useful substances in industrial wastewater, such as pulp in papermaking wastewater.
3. To take the place of secondary sedimentation tank in separating and concentrating sludge in water.

Main types
1. Electrolytic a ir flotation equipment
Electrolytic flotation equipment is electrolytic wastewater directly with incompetent anode and cathode. The flocculated suspended matter is floated to the surface of the water by the small bubbles of hydrogen and oxygen produced by electrolysis. To achieve the purpose of solid-liquid separation.
2. Dispersed air flotation equipment
Smoke air flotation equipment is a high-speed rotation of the impeller by the centrifugal force caused by the vacuum negative pressure state of the air inhaled into a fine air bubbles and spread in the water.
3. Dissolved-air vacuum flotation equipment
The supersaturated air in the water can be released in the form of fine bubbles during decompression, so that the impurity particles in the water are adhered and floated.
4. Pressurized dissolved-air flotation equipment
 Pressurized dissolved air flotation equipment is the pressurized water to (3-4) × 105Pa, while adding air, the air dissolved in water, and then suddenly reduced to atmospheric pressure, dissolved in water in the form of tiny bubbles (bubble diameter About 20-100 μm), precipitated from the water, and the suspended particles in the water are supported on the surface of the water. Thereby achieving solid-liquid separation. Pressurized dissolved air flotation equipment is a wide range of applications of a flotation equipment. The equipment can be widely applied to all types of wastewater treatment (especially oil-containing wastewater treatment), sludge concentration and water treatment.