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APPENDIX
APPENDIX C
ESTIMATED CARBON CAPACITIES FOR CONTAMINANT
This section is provided to present a list giving estimated activated carbon capacities for contaminant
vapours. The adsorption capacity of activated carbon for the various vapours varies with:
• concentration,
• humidity and temperature,
• actual velocity used through the filters,
• contact time,
• particle size of the activated carbon,
• diffusion coefficient of the constituent(s) to be adsorbed,
• distribution of the pore sizes of the activated carbon.
The numbers given in the list represent typical or average conditions, presuming that a good pre filtration
has removed liquid and/or solid impurities which could also be present in the gas/air to be cleaned. The
given capacities are equilibrium capacities. In fixed bed adsorbers, the effective capacity could be
somewhat lower due to the mass transfer zone (MTZ) in the activated carbon bed. This MTZ is
influenced by the type of activated carbon, the process conditions and the required removal efficiency.
Impregnation of activated carbon is used to increase the capacity for some gases, such as mercury,
hydrogensulphide, acid gases, ammonia, etc. The components marked in the list with an asterisk can be
removed by use of an impregnated carbon. Combination of impregnated and non impregnated carbons
can solve cases in which various components have to be removed.
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