A device used to remove non-particulate air pollutants such as sulfur dioxide from the exhaust gases released from all types of combustion, from incinerated waste to incinerated coal used to generate energy. The type of scrubber used depends on the pollutants to be removed from the exhaust. Coal-fired generator scrubbers typically use lime (calcium oxide) as a reactive agent. This substance reacts with sulfur dioxide to produce calcium sulfate, a solid substance which is more easily manageable than gaseous sulfur dioxide.

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