Well, also the deodorization is based on the phenomenon of absorption. The molecules present in the gas phase migrate into the liquid phase and react with suitable deodorizing chemical compounds, which modify the chemical structure of odor molecules and will neutralize olfactory effects.
In order make happen this efficiently, it is appropriate to create a large contact surface between gas and liquid, by means of a fine dispersion of droplets which come into contact with the entire gaseous phase.
There is a method which allows to neutralize odors by chemical transformations: biofiltration.
For us humans the odorous molecules are often annoying. You cannot say the same for some microorganisms, which are greedy and that cleverly fit into their metabolism. Biofiltration is based on this principle: the use of specific strains of microorganisms to metabolize the volatile compounds and odors.
Ok, the principle is simple. How can we develop it in practice? In practice, it makes necessary the presence of a substrate, on which the microorganisms can flourish. To this end, it is used the ligno-cellulosic material, ideal for the development of the microorganisms themselves if mantain in certain operating conditions. Among these we include: