Dry Scrubbing

In "dry scrubbing" a solid sorbent is injected into the gas stream which reacts with the contaminant and is removed on a filter, together with any other particulates. This produces a dry powder for disposal. Alkalis such as lime or sodium bicarbonate are injected for the removal of acid gases such as sulphur dioxide and hydrogen chloride. Powdered active carbons can be injected to remove heavy metals and trace organic compounds such as dioxin.