What are gas scrubbers

One of the most effective and common techniques used in gas scrubbers is to subject the gases to a gas-liquid absorption process. To accomplish this, the contaminated gas is introduced at the bottom of the scrubbing tower and circulated to the top of the tower, internally the scrubbing liquid is found running through the top and is distributed throughout the body of the column to absorb the contaminants and thus scrub the air.
The type of liquid used inside the scrubbing tower will be determined by the contaminants to be scrubbed, among the commonly used liquids are: Water, acid solution, alkaline solution, sodium hypochlorite, potassium permanganate or a combination of liquids as the case may be, if the contaminants present in the gases are the result of the handling of nitrogen they can be absorbed in an acid medium, on the other hand if they are from the use of sulfur these particles are sensitive to the absorption of an alkaline or oxidizing liquid, and in other cases the particles are soluble in ordinary water and therefore does not require any chemical reagent.