The solutions used for this process are characterized by a specific pH that determine its acidity or basicity. Conventionally pH value is inside a range from 0 (maximum acidity) to 14 (maximum basicity). At 7 the pH is neutral: typical value of water at a temperature of 25°C.
The acqueous solution used inside scrubbers will have a pH suitable to abate the pollutants. The basic VIC are reduced thanks to an acid reagent, while the acid VIC are reduced through the use of a basic reagent.
To guarantee the abatement efficiency, the solution contained into the tank under the scrubber, is linked to reagent tank. In this way, a special pump transfers the reagent directly inside the tank in order to compensate the pH values.
The following image could be used to better understand the working principle of the scrubber: