dry scrubbers do not utilize a liquid to absorb contaminants. Because of this difference, steam is not produced by the reaction, and a wastewater system is not needed. A dry industrial scrubber is composed of a reaction center where the sorbent or dry reaction material that absorbs contaminants is mixed with the polluted gas. Also within the system is a material component that aids in the removal of the reaction product, which is the dry sorbent bound to the pollutant. Dry scrubbers are used primarily to remove acids found within gasses.
The dry sorbent used to remove the acid from the gas is usually made of an alkaline slurry. This slurry is basic in nature and will neutralize the acid found in the gas.