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Changes in Trace Element Mobility as Affected by PDF Print E-mail

Presented at 15th ICHMET conferene in GDANSK, September 2010.  HEAVY METALS IN SEDIMENTS AND REMEDIATION TECHNOLOGIES. Authors  Hamberg, Nordmark, Kumpiene, Lagerkvist.


Thermal treatment effectively removes organic compounds from contaminated soil,

but impact on co-present trace elements needs further investigations. The aim of this study

was to modify properties of thermally treated soil by adding industrial by-products with

qualities likely to alter the leaching of Cr, Cu and As. Soil samples from a former industrial

wood impregnation site contaminated with chromated copper arsenate and creosote was

mixed either with gypsum (waste of gypsum boards), magnetite (steel processing residue,

69% Fe2O3), steel abrasive (Fe0) or fly ash (all 5 wt%) before thermal treatment at 800 °C.

The addition of by-products followed by thermal treatment had a minor effect on Cr, Zn and

Cu leaching, while all amendments stabilized As after thermal treatment compared to the

non-amended thermally treated soil. Nevertheless, As leaching from thermally treated soil,

whether amendments were used or not, was considerably higher than in soil without thermal

treatment. Further solid state analyses can help to identify reasons for changed As

mobility after thermal treatment of soil amended with industrial by-products.