Application and function of polyacrylamide in Dissolved Air Flotation (DAF)

Dissolved Air Flotation (DAF) is a water treatment technology used to remove pollutants such as suspended matter, grease, and solid particles from water. Flotation technology has a high removal efficiency for fine suspended matter and can remove tiny particles that are difficult to remove by traditional sedimentation methods. Flotation technology is widely used in the treatment of urban sewage and industrial wastewater, such as paper-making wastewater, ore pulp, etc., to increase the water reuse rate or reduce the pollution of wastewater to the environment. 

Flotation technology can also effectively separate oil-water mixtures, and is therefore widely used in oil fields, metallurgy and other industries. In the flotation process, flocculants, such as polyacrylamide, are usually required to improve the treatment effect.

The role of polyacrylamide in the reaction zone of the flotation machine：
As a high molecular polymer, water treatment polyacrylamide has a strong flocculation ability. In the flotation process, the addition of PAM can promote the formation of larger floccules by suspended particles and colloidal substances in the water through electrical neutralization and bridge adsorption. Because these floccules have better sedimentation performance, they are more easily captured by microbubbles in the flotation machine and brought to the water surface to form scum, thereby achieving solid-liquid separation. 

In addition, the addition of polyacrylamide can improve the adhesion between bubbles and suspended particles, further enhancing the flotation effect.

In flotation treatment, polyacrylamide can inhibit the generation of bubbles, reduce the accumulation of foam, and increase the water surface tension, thereby reducing the interference of bubbles on sewage treatment.