What method is commonly used to remove emulsified oil from wastewater?

Dissolved air flotation is commonly utilized for the removal of emulsified oil from wastewater due to its effectiveness in separating lighter-than-water materials, such as oil, from the liquid phase. In this process, air is dissolved in the wastewater under pressure and then released at atmospheric pressure in a flotation tank. This causes tiny air bubbles to form, which attach to the emulsified oil droplets, increasing their buoyancy. As a result, the oil rises to the surface, forming a scum layer that can be easily removed.

This method is particularly advantageous for treating wastewater with emulsified oils because it can efficiently handle high oil concentrations and provides effective separation without the need for coalescing agents or extensive chemical treatment, making it a favored choice in industrial processes. Other methods, while effective for different treatments, are not specifically designed for the efficient removal of emulsified oils.