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Wood Ash Database

– Wood for Energy -

WoodAsh reference search

This reference database is meant to provide further reading and understanding of wood ash use in forestry and related research areas.

Use the search function below to access references to hundreds of publications in the form of books, articles, dissertations etc.

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TitleEvaluation of the leaching characteristics of wood ash and the influence of ash agglomeration
Author(s)Steenari BM;Karlsson LG;Lindqvist O;
Date1999 16
JournalBiomass & Bioenergy
Start page119
End page136
Volume16
Issue2
AbstractThe release of mineral nutrients and other species from untreated and stabilized wood ash was investigated. Stabilization was applied to form dense ash particle agglomerates. This process induces the formation of several secondary minerals. The most important reaction is the transformation of Ca(OH)2 to CaCO3 which lowers the Ca leaching rate significantly. A significant fraction of the alkali metals, K and Na, is present in salts which are rapidly released. The short-term release of these salts, as simulated in laboratory experiments, was not reduced by the stabilization methods applied. In general, low leaching rates were observed for P and Mg as well as for Fe and other metals from both untreated and agglomerated ashes. Thermodynamic equilibrium modelling of the hardening process showed that in addition to the transformation of Ca(OH)2 to CaCO3, formation of ettringite is possible at a high pH. Experimental results confirmed this. As the pH in the pore solution decreases during long-term leaching ettringite will be transformed into CaCO3 and gypsum. In accordance with the experimental results, no formation of secondary solubility controlling K or Na compounds was indicated by the modelling results