Proceedings of the Estonian Academy of Sciences | |
Extractability of heavy metals in cyclone ash | |
Lilli Paama1  Toomas Tenno1  Hannu Nurmesniemi1  Risto Pöykiö1  Hannu Rönkkömäki1  | |
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关键词: environmental research; air pollution; ash; cyclone; extraction; heavy metals; waste; | |
DOI : 10.3176/proc.2008.2.04 | |
学科分类:化学(综合) | |
来源: Teaduste Akadeemia Kirjastus | |
【 摘 要 】
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 concentraÂtions 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.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912040510646ZK.pdf | 73KB | download |