Chemical composition and leaching characteristics of granules made of wood ash and dolomite |
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| Authors: | S L Holmberg B B Lind T Claesson |
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| Institution: | 1.Inst. of Natural Sciences, Kalmar University College, POB 905, SE-391 29 Kalmar, Sweden e-mail: sirkku.holmberg@hik.se,SE;2.Earth Sciences Centre, G?teborg University, POB 460, SE-405 30 G?teborg, Sweden and Swedish Geotechnical Institute,SE |
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| Abstract: | In 1995, the central heating plant Draken in Kalmar, Sweden, started manufacturing a granular ash product for nutrient recycling
to forest soil, instead of dumping the ash in landfills. Chemical composition, leaching and dissolution characteristics were
determined for the Draken wood ash, the dolomite used in granule manufacturing and the final granule product. The heavy metal concentrations in fly
ash were within the limit values recommended by the Swedish National Board of Forestry for ash recycling, except for Cd and
As levels which occasionally exceeded the limit values. The Ca, Mn and P levels were too low for nutrient recycling at the
time. Adding dolomite insures that the levels of the important nutrients Ca and Mg are sufficient in the granules. After 7
months in the field, about 60 % of Na and K was leached out from granules. Between 20 and 60% of trace elements Mo, Sc, V,
Y and Zr were leached out after 7 months. The release of Ca and Mg was low, 1–5% during 7 months.
Received: 12 July 1999 · Accepted: 31 August 1999 |
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| Keywords: | Wood ash Ash chemistry Granulated wood ash Biomass ash |
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