Which statement describes Scrubbers?

• A. Move gases through a spray of water that dissolves many pollutants
• B. Measure oxygen content in exhaust
• C. Filter solid particles from air
• D. Generate electricity from exhaust gases

Answer: (A)

Scrubbers clean exhaust by forcing the gas to contact a liquid, usually water, so pollutants dissolve into the liquid or react with it and are carried away from the gas stream. This is exactly what the statement describes—moving gases through a spray of water to dissolve or remove pollutants. Wet scrubbers are commonly used to remove acid gases like sulfur dioxide from industrial emissions.

The other ideas don’t fit scrubbers: measuring oxygen content is done by gas analyzers, not scrubbers; filtering solid particles from air is the job of filters or dust collectors; generating electricity from exhaust is a function of energy-recovery or turbine systems, not scrubbers.