Pneumatic ejectors are often used in wastewater treatment plants. Which of the following descriptions best describes a pneumatic ejector?

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A pneumatic ejector is a device that uses the pressure of compressed air to force the movement of fluid. Pneumatic ejectors are typically used in treatment plants to raise wastewater or sludge to a higher elevation. Smaller-scale pneumatic ejectors have been in widespread use for over 140 years in sewer collection systems to move sewage from residential plumbing systems to mainline sewers.

Pneumatic Ejectors Are Often Used in Wastewater Treatment Plants