What are scrubbers? Scrubbers are high efficiency air pollution control equipments used to remove particulate matter, fumes and gases (especially acid gases) from industrial processes. The process takes place by ‘scrubbing’ the pollutants by contacting them with a scrubbing media (either wet or dry) thus resulting in a residual exhaust of negligible particulate size. We thus categorise them into dry and wet scrubber systems.

Wet Scrubbers: A Wet Scrubber System uses either water or other liquid solutions to scrub particulate matter and harmful gases from the gas stream. A Wet scrubber captures the particles in fine liquid mist droplets or in layers of scrubbing liquid and then separates the liquid droplets from the gas stream.

Efficiency of scrubber depends upon the following major parameters:

o Formation of mist of tiny droplets

o Resistance produced due to pressure drop creation

o Selection of suitable scrubbing liquid for gaseous pollutants

o Relative velocities between dust particles & liquid droplets

o Uniform mixing between gas molecules and liquid phase

o Treatment and reaction time between liquid droplets and gas molecule

o Selection of appropriate liquid to gas ratio