An air flotation machine is a common water treatment equipment, primarily used for the removal of suspended solids, colloids, and oils from wastewater. Below, we will provide a detailed introduction to the principles, classifications, working methods, and application fields of air flotation machines.
Firstly, the working principle of the flotation machine is to separate suspended substances from water by utilizing the buoyancy of gas in it. After pre-treatment, the water enters the flotation tank. The suspended substances in the wastewater flow into the tank along with the water current. Then, a certain amount of gas, usually compressed air, is injected into the tank. Upon entering, the gas forms tiny bubbles that physically react with the suspended substances. The bubbles generate upward force in the water, lifting the suspended substances along with them, creating a foam layer. The clear water above the foam layer is discharged through overflow pipes. The suspended substances on the foam layer, after coagulation, become very fine and are discharged through the overflow outlet.
Based on the differing structures and working methods, air flotation machines can be categorized into various types. Common types include pressure-type, saturated-type, and sub-atmospheric pressure-type air flotation machines. Pressure-type air flotation machines achieve flotation by injecting gas into a pressurized container and creating a high-speed airflow at the overflow outlet. Saturated-type air flotation machines dissolve gases in water to saturation, then produce bubbles and achieve flotation by reducing pressure. Sub-atmospheric pressure-type air flotation machines partially saturate the gas, then expel it through a nozzle to form tiny bubbles for flotation.
The flotation machine boasts high treatment efficiency and a wide range of applications. It effectively removes suspended matter, colloids, and oils from water, thereby purifying the water quality. It is extensively used in industrial sectors such as wastewater treatment plants, paper mills, and food factories for processing industrial and production wastewater. Additionally, the flotation machine can be applied in urban wastewater treatment, water purification in waterworks, and rural wastewater treatment, among others. Its prospects in water treatment are vast.
In summary, the flotation machine is a widely-used water treatment equipment that separates suspended matter from water by utilizing the buoyancy of gases. It comes with various working principles and classifications, applicable to water treatment projects across various fields. With the enhanced environmental awareness and the scarcity of water resources, the application prospects of the flotation machine in the water treatment industry will be even broader.