Chemical fractionation method for characterization of biomass-based bottom and fly ash fractions from large-sized power plant of an integrated pulp and paper mill complex
(1. City of Kemi, Valtakatu 26, FI-94100 Kemi, Finland;
2. Stora Enso Oyj, Veitsiluoto Mill, FI-94800 Kemi, Finland;
3. Department of Forest Products Technology, School of Chemical Technology, Aalto University,
P. O. Box 16300, FI-00076 Aalto, Finland;
4. Division of Biomass Technology and Chemistry, Department of Forest Biomaterials and Technology,
Swedish University of Agricultural Sciences, P.O. Box SLU, SE-90183 Ume？, Sweden)
2. Stora Enso Oyj, Veitsiluoto Mill, FI-94800 Kemi, Finland;
3. Department of Forest Products Technology, School of Chemical Technology, Aalto University,
P. O. Box 16300, FI-00076 Aalto, Finland;
4. Division of Biomass Technology and Chemistry, Department of Forest Biomaterials and Technology,
Swedish University of Agricultural Sciences, P.O. Box SLU, SE-90183 Ume？, Sweden)
Abstract: The aim of this study was to extract the biomass-based bottom and fly ash fractions by a three-stage fractionation method for water-soluble (H2O), ammonium-acetate (CH3COONH4) and hydrochloric acid (HCl) fractions in order to access the leaching behaviour of these residues. Except for Mo, S, Na and elements whose concentrations were lower than the detection limits, the extractable element concentrations in both ash fractions followed the order H2O<CH3COONH4<HCl. The elements concentrations in this study were also lower than those in our previous studies, in which certain extraction stages followed the BCR extraction procedure.
Key words: ash; extraction; forest industry; landfilling; leaching; heavy metals; waste