Which aeration method uses a physical structure to enhance air mixing?

The packed-tower aeration method is designed to enhance air mixing by utilizing a physical structure that facilitates the movement of air and water together. In a packed tower, water flows down through the packing material, which is designed to create maximum surface area and contact between the water and the air.

As air is introduced at the bottom of the tower, it rises against the downward flow of water. The packing material promotes turbulence and enhances the interaction between the air and water, allowing for effective transfer of oxygen from the air into the water. This method is particularly efficient in removing volatile organic compounds and improving water quality through effective aeration.

This structure and design of the packed tower is key to its effectiveness, as it maximizes the interface for gas exchange, leading to improved aeration efficiency compared to methods that do not utilize such a physical enhancement.