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The efficiency of removing SO2 from the flue gas by limestone in wet scrubbers can be as high as

  • A.30%
  • B.50%
  • C.70%
  • D.90%

Answer: D

Limestone in a wet scrubber can remove as much as 90% of the SO2 from flue gas.

The gas is washed with a limestone slurry, which reacts with SO2 to form calcium sulphite and then calcium sulphate (gypsum). Well-designed wet limestone scrubbers reach removal efficiencies of about 90% or more. The lower figures of 30, 50 and 70% are efficiencies of simpler dry or partial processes, not the best figure that is asked for.

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