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Title: Comparison of immobilisation of air pollution control residues with cement and with silica
Authors: Geysen, Daneel ×
Vandecasteele, Carlo
Jaspers, M
Wauters, G #
Issue Date: Mar-2004
Publisher: Elsevier science bv
Series Title: Journal of hazardous materials vol:107 issue:3 pages:131-143
Abstract: Cement as agent for immobilising Pb from air pollution control residues is compared with the use of different silica-containing materials. The DIN 38414-S4 leaching test was used to control Pb leachability and to compare obtained Pb leachate concentrations with the landfill limit of 2 mg/l for Pb. Firstly, one scrubber residues was treated with cement and micro-silica. With cement, the Pb leachability could be reduced with a factor ranging from 3 to 50 depending on the type and amount of cement used and depending on the curing time. The landfill limit of 2 mg/l was, however, never attained. From all tested silica-containing additives, aerosil could reduce the initial Pb leaching (101.3 mg/l) to below the detection limit at a dosage of 0.13 g aerosil/g residue. Second best and an economically. preferable silica-containing additive was micro-silica: a reduction from 101.3 to 0.7 mg/l was observed at a dosage of 0.4 g micro-silica/g residue. The formation of Ca-silicates was found to be responsible for the decreased Pb leachability.
URI: 
ISSN: 0304-3894
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Process Engineering for Sustainable Systems Section
Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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