Adsorption For Environmental Remediation:
The Use Of Activated Carbon As A By-product
From A Biomass Gasification Plant Compared
With Commercial Activated Carbon
Author(s)
A. S. Oliveira, C. M. Cardoso, C. G. Maia & P. Brito
Abstract
Activated carbon is a well known amorphous adsorbent for hydrophobic
pollutants, having the ability to take in its porous structure molecules of very
different sizes. Portalegre Polytechnic Institute has a pilot plant for biomass
gasification for syngas production, the residues of which need remediation. The
syngas production process produces tar rich liquid condensates and powdered
carbon as main residues. The powdered carbon is in fact activated carbon once it
results from partial combustion at high temperatures and so it can be used as an
adsorbent for pollutant removal from any effluent. Condensates resulting from
gasification are coloured and strongly odoured residues; rich in hydrocarbon
contaminants usually known as tars. In this work, powdered carbon residue was
used to adsorb the contaminants present in the condensate residue produced in
the process. The adsorption process was shown to be highly efficient in the
removal of odour and colour from gasification condensates and the results were
not very much different from the ones obtained for commercial activated carbon.
After being used for adsorption, the carbon residue can be reburned in the
gasification plant (which also needs coal for the heating start up procedure) to
promote a final destruction process of the adsorbed contaminants with
production of freshly activated carbon.
Keywords: activated carbon, adsorption, biomass gasification, tars,
condensates, remediation of biomass residues.
Keywords
activated carbon, adsorption, biomass gasification, tars,
condensates, remediation of biomass residues.
Related Book
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