Which of the following is true regarding a crossflow tower?

A crossflow tower is an air stripping technique that allows for the efficient removal of volatile organic compounds (VOCs) or gases from liquids, particularly wastewater. In this process, air is introduced countercurrent to the flow of the contaminated liquid, promoting the exchange of gases. This setup is beneficial because it creates a larger interface between the air and the liquid, enhancing mass transfer and facilitating the stripping of unwanted components from the liquid phase.

While multiple concepts are associated with towers in wastewater treatment, such as packed towers and diffused aeration, the defining characteristic of a crossflow tower is its functionality in air stripping. This illustration makes it clear that its primary role is focused on improving the quality of wastewater by removing unwanted volatile substances, rather than serving as a general packed tower or aeration method typically seen in other specialized applications.