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4.2.4 - Adsorption

Depending on requirements, compressed air or gas can, in a further process, also be separated from gaseous impurities by passing it through a layer of activated charcoal or other adsorptive material. Activated charcoal adsorbs gas molecules which could cause odour, taste or subsequent condensation back into a liquid phase. In general, there are two types of activated carbon filter element which are distinguished by the type of construction and the form by which the activated carbon takes. The fist type is an impregnated paper or other substrate which may be wrapped or pleated, the second type being based upon granular carbon in the form of a deep bed. Both have odour removal capability, but care is required during selection of these types due to life versus pressure drop consideration.