Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub


    Processing of pine wood chips in a pilot-scale downdraft gasifier generated a carbon-rich fly ash as a byproduct. Studies on biomass-derived fly ashes have generally focused on their direct characterisation, as generated, to develop options for utilisation or disposal. Analogous to studies on coal-derived fly ashes, strategies were applied here to assess the feasibility of isolating chars for value-added applications and to determine their elemental compositions relative to that for the feedstock. The inorganic ash content of the biomass-derived fly ash was 48.4%. Sieving followed by washing with deionized water afforded large char particles (>10 mesh) with an ash content of only 3.59%. A subsequent acid treatment reduced the ash content to 1.55%; further demineralization treatments to obtain lower ash contents were deemed impractical. Elemental analyses showed calcium was the most abundant inorganic element in the feedstock, fly ash, and water-washed char. The apparent removal of calcium carbonate by the acid treatment afforded a char in which potassium was the most abundant element. Results suggested that the chars surviving gasification may function as adsorbents in situ for elements that are volatile under the conditions of gasification.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Eberhardt, Thomas L.; Pan, Hui. 2012. Elemental analyses of chars isolated from a biomass gasifier fly ash. Fuel 96:600-603.


    Google Scholar


    Bioenergy, Carbon, Gasification, Inorganic elements, PIXE

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page