Scrubber technology is considered and designed to: absorb and adsorb harmful substances; cool gases; condense vapours; and even separate dust particulates, if present. The main common assemblies used are either Chemical Aborption; Biological Oxidation; or Adsorption. Depending on the problem at hand, it is even common for a combined system to be designed depending on the off-gas stream  to be treated.


Chemical Scrubbers are used as high efficient removal applications. The gas stream is absorbed by dissolving the pollutant into the scrubbing liquid, then the correct scrubbing liquid, concentration and quality are used to target the particular pollutant. The setup is a counter-flow direction flow of gas stream versus scrubbing liquid.

Activated Carbon Scrubbers are typically used in processes which generate emissions of high levels of volatile organic compounds (VOCs), odours, Mercaptans, and sulfurous compounds such as H2S (Hydrogen Sulfide). The critical aspect of adsorption technology is the temperature of the incoming exhaust stream and humidity/moisture levels. This form of scrubbing is commonly used in food manufacturing and water treatment facilities


The following table categorises which Scrubber is suitable for the common compounds to be treated:

Dry Scrubbing Contaminants

Wet Scrubber Contaminants

SO2 – Sulfur dioxide

SO2 – Sulphur dioxide

NH3 – Ammonia (low concentrations)


SO3 – Sulphur trioxide

H2S – Hydrogen sulfide

H2S – Hydrogen sulfide

Sulfurous components

HBr – Hydrogen bromide

HCN – Formonitrile

HNO3 – Nitric Acid

CCl4 – Carbon tetrachloride

CO2 – Carbon dioxide

Hg – Mercury

CO – Carbon monoxide

HF – Hydrofluoric acid

HF – Hydrofluoric acid

VOCs – Volatile organic compounds

NH3 – Ammonia


CO2 – Carbon dioxide

HCl – Hydrochloric acid

Odorous compounds

Cl2 – Chlorine

F2 – Difluorine

Br2 – Bromine Dibromine


Odorous compounds


VOCs – Volatile organic compounds