Which piece of equipment is operated in conjunction with air pressure?

The ejector is specifically designed to utilize air pressure or vacuum to move liquids. It employs the principle of the Venturi effect, where a fluid's velocity increases in a constricted section of piping, which, in turn, creates a localized drop in pressure. This drop allows for another fluid—often a liquid—to be drawn into the stream and transported along with the primary fluid being moved. Ejectors are commonly used in sewage treatment systems to handle sludges or waste materials where air pressure is needed to facilitate the movement, offering efficiency in transferring materials without the need for mechanical parts that could wear out over time.

Other equipment, like centrifugal pumps or sump pumps, primarily rely on mechanical action to move fluids and do not directly operate based on air pressure. Although a Venturi can function similarly by utilizing air pressure changes, the focus in this question is on equipment that operates directly with air pressure as part of its primary function in sewage treatment processes.