DescriptionFor further treatment or utilisation of biomass ashes in the environment (e.g. in forests or on greenland) it is important to know their metal concentrations. In a first project, mainly fly ashes (also bottom ash from one incinerator) from different biomass incinerators have been investigated. For measurement the ash samples were dissolved in a microwave digestion unit using nitric acid and hydrochloric acid. Afterwards the concentration of the metals Al, As, B, Ba, Cd, Co, Cr, Cu, Fe, Hg, Mg, Mn, Ni, Pb, Sb, Sr, Ti, Tl, V and Zn were quantified by ICP-OES. It could be found that the metal concentrations in the ash fractions vary depending on the composition of the input material (different kinds of wood like used wood, wood chips, bark). Also it could be seen that some metals were found dominantly in fly ash (e.g. Cd, Cu, Pb, Tl, B, Zn and Mn), whereas others were mostly determined in the bottom ash (e.g. Co, Cr, Ni and Ti). Others showed a more or less equal distribution in both fractions (e.g. As, V, Ba, Sr, Al, Fe and Mg). In currently running projects more ash samples from biomass incinerators are being investigated in order to certify the preliminary results. Fly and bottom ash of about 30 biomass incinerators in Upper Austria are currently examined. In the future also samples from incinerators in Lower Austria are planned for investigation. The analysis of the data will be classified depending on power of biomass incinerators, input material (different kinds of wood or other biomasses) and gas cleaning systems.
|Period||31 May 2008|
|Event title||4. ASAC JunganalytikerInnen Forum|