eesti teaduste
akadeemia kirjastus
SINCE 1952
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of the estonian academy of sciences
ISSN 1736-7530 (Electronic)
ISSN 1736-6046 (Print)
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Extractability of heavy metals in cyclone ash; pp. 100–106

Full article in PDF format | doi: 10.3176/proc.2008.2.04

Risto Pöykiö, Hannu Rönkkömäki, Hannu Nurmesniemi, Toomas Tenno, Lilli Paama


Landfill disposal is the only reasonable option for cyclone ash due to its elevated concentrations of the heavy metals Cd (25 mg kg–1; d.w.), Zn (3630 mg kg–1; d.w.), Ba (4260 mg kg–1; d.w.), and Hg (1.7 mg kg–1; d.w.). The distribution of heavy metals (i.e. Cd, Cu, Pb, Cr, Zn, As, V, and Ba) after a three-stage BCR sequential extraction procedure between the exchangeable (CH3COOH), easily reduced (NH2OH–HCl), and oxidizable (H2O2 + CH3COONH4) fractions showed that the highest concentra­tions of most of the heavy metals occurred in the oxidizable fraction. This indicates that a major part of the heavy metals retained in the cyclone ash originating from a small-scale (6 MW) municipal district heating plant incinerating forest residues (i.e. wood waste and bark) are not easily liberated under the conditions normally found in nature.


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