Environmental Pollution And Waste Management Practice Test

Which pollutant is commonly targeted by wet scrubbers in industrial exhaust streams?

SO2 CO2 Lead Ozone

Correct Answer:

SO2

Explanation:

Wet scrubbers are designed to remove pollutants by dissolving them into a liquid as the exhaust gas passes through a spray or packed bed. They work best for acid gases that readily dissolve and react with the liquid. Sulfur dioxide fits this well: it dissolves in water and reacts with alkaline slurries (like lime) to form sulfite and sulfate compounds, effectively pulling SO2 out of the gas stream. This makes SO2 a primary target for wet scrubbers in many industrial exhaust systems. In contrast, CO2 is harder to remove with simple wet scrubbing on a cost-effective basis; lead is mainly captured as particulates by filtration devices rather than absorption in water; ozone requires different technologies. So the pollutant commonly targeted by wet scrubbers is sulfur dioxide.

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