Companies that generate a large amount of wood ash will need an industrial process to agglomerate the ash and
lower its reactivity, because untreated ash is a dust hazard for workers and is difficult to spread evenly on forest soil. In
addition, untreated ash can cause burning damage to vegetation owing to its alkalinity and rapid release of salts.
Production of large amounts of wood ash agglomerates demands an effective dehydration process. The reactivity and
release of inorganic constituents from wood ash pellets dehydrated at room temperature using hot air and flue gas was
investigated. Our results imply that flue gas-treated pellets have significantly lower reactivity in terms of pH and electrical
conductivity, and release less Ca2+ and more Mg2+ compared to pellets dried at room temperature or in hot air. Ash pellets
dehydrated in hot air are very reactive, and release more Ca2+ than pellets dried in other ways. The formation of syngenite
during the flue-gas treatment decreases K+ release from the ash pellets.