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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 8, No. 4, 2011, pp. 667-676
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Bioline Code: st11061
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 8, No. 4, 2011, pp. 667-676
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Heavy metal chemical fractionation and immobilization in lightweight aggregates produced from mining and industrial waste
González Corrochano, B.; Alonso Azcárate, J. & Rodas Gonzalez, M.
Abstract
The fractionation of five heavy metals in a washing aggregate sludge, a sewage sludge, a clay-rich sediment, the mixtures of these materials and the lightweight aggregates manufactured with them has been deterined by
applying the optimized European Community Bureau of Reference sequential extraction procedure in order to evaluate
the effects of the heating process on the extraction of these elements. Additionally, preparation of eluates by aggregate
leaching has been performed in accordance with the UNE-EN-1744-3 standard. The availability of all the studied heavy
metals has been reduced by the thermal treatment, since most of the heavy metals have become part of the undigested
material in the lightweight aggregates. Nickel has been the heavy metal that has presented the highest concentration in
the eluates obtained after completion of the single extraction procedure in the lightweight aggregates. The studied
lightweight aggregates may be used in lightweight concrete manufacturing from the standpoint of heavy metal leaching.
Keywords
Availability; Leaching; Sequential extraction procedure; Single extraction procedure; Thermal treatment
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