A wet scrubber is a specialised control apparatus designed to separate pollutants from a gas stream through the absorption process. Absorption entails the physical or chemical removal of pollutants from a gas phase medium by dissolving them into a solvent medium. Typically, the solvent medium is in a liquid phase, but in certain systems, it can also be a dry bulk solid. The substance that absorbs pollutants is termed the solvent, while the gas subject to absorption is known as the solute.
An example of the wet, packed tower scrubber's practical application is in acid gas scrubbing. Acid gas scrubbers play a crucial role in managing emissions resulting from the oxidation of halogenated compounds like HCl, H2S, and SO2. These compounds have the potential to form acid gases during the oxidation process in a thermal oxidizer.