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Reference.org
Flue-gas desulfurization
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<p>Flue-gas desulfurization (FGD) is a set of technologies used to remove <a href="/facts/Sulfur_dioxide/jDK1fIDs">sulfur dioxide</a> (SO2) from <a href="/facts/Flue_gas/ETBGr9II">exhaust flue gases of fossil-fuel power plants</a>, and from the emissions of other sulfur oxide emitting processes such as waste <a href="/facts/Incineration/ALwWqMlv">incineration</a>, petroleum refineries, cement and lime kilns. </p>