Removal of arsenic from toxic ash after combustion of impregnated wood

L. M. Ottosen, A. J. Pedersen, I. V. Kristensen, Alexandra B. Ribeiro

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

In the next ten years the amounts of waste wood impregnated with Cu, Cr and As (CCA) is expected to increase dramatically. Mixed with municipal solid waste for incineration the wood constitutes a problem because As emission is not hindered through common flue gas treatment. Furthermore the ashes will contain higher concentrations of Cu, Cr and As. In different countries initiatives has been taken or are implemented to sort the impregnated wood from other waste and handle the wood separately. This handling can involve combustion in special plants. This paper deals with electrodialytic treatment of ash from combustion of CCA treated wood. The total concentrations in the ash were very high: 69 g Cu/kg, 62 g Cr/kg and 35 g As/kg. A SEM/EDX analysis showed that Cr was mainly build into the matrix structure of the ash. Cu, too, but some Cu was also precipitated on the surface of the particles. As, on the other hand, was only found associated with Ca and thus probably in a soluble form. As is the main problem of the ash due to the high toxicity and mobility and thus the treatment aims at removing this element. It was shown that during 5 days of electrodialytic treatment 92% As could be removed.

Original languageEnglish
Pages (from-to)993-996
Number of pages4
JournalJournal De Physique Iv
Volume107
Issue numberII
DOIs
Publication statusPublished - 1 Jan 2003
EventXII International Conference on Heavy Metals in the Environment - Grenoble, France
Duration: 26 May 200330 May 2003

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