University of Oulu

Janne Pesonen, Toivo Kuokkanen, Pasi Rautio, Ulla Lassi, Bioavailability of nutrients and harmful elements in ash fertilizers: Effect of granulation, Biomass and Bioenergy, Volume 100, May 2017, Pages 92-97, ISSN 0961-9534,

Bioavailability of nutrients and harmful elements in ash fertilizers : effect of granulation

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Author: Pesonen, Janne1; Kuokkanen, Toivo1; Rautio, Pasi2;
Organizations: 1Research Unit of Sustainable Chemistry, P.O. Box 3000, 90014 University of Oulu, Finland
2Natural Recourses Institute Finland, Eteläranta 55, 96300 Rovaniemi, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.1 MB)
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Language: English
Published: Elsevier, 2017
Publish Date: 2019-05-01


Environmental policies of the European Union (EU) aim to increase the amount of renewable energy and to improve the use of waste streams. This will increase the amount of fly ash (FA) from biomass combustion, thereby increasing the need for its utilization. Biomass FA is a good fertilizer since it contains most of the nutrients that plants need. Sequential leaching would provide a more accurate assessment of the potential bioavailability of the harmful elements and nutrients than the pseudo-total and/or water-soluble concentration analysis that EU environmental legislation typically requires. This study investigated the effect of granulation and ammonium sulfate addition on the solubility and bioavailability of nutrients and harmful elements from peat and wood co-combustion FA by using sequential leaching and pseudo-total acid digestion. The recoveries of the easily bioavailable nutrients Ca, K, Mg, P, and S as well as the total bioavailability of Ca, K, Mg, and S reduced significantly after granulation. Therefore, granulation reduced the fertilizing effect of FA. The pseudo-total recovery of Ca, Mg, and S reduced after granulation, indicating that these types of FA form some very stable silicate compounds besides the common self-hardening products. Ammonium sulfate addition increased the recoveries of the easily bioavailable nutrients and total bioavailability recoveries of the Ca, K, and Mg back to the same levels as those in FA. The total bioavailability of the harmful elements As, Cd, Cr, Cu, Ni, Pb, and Zn was very low, and this does not limit the usability of FA as a fertilizer.

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Series: Biomass & bioenergy
ISSN: 0961-9534
ISSN-E: 1873-2909
ISSN-L: 0961-9534
Volume: 100
Issue: May
Pages: 92 - 97
DOI: 10.1016/j.biombioe.2017.03.019
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
1172 Environmental sciences
Funding: This work was done under the auspices of the Biotuhka (Bioash) ERDF Project (project no: A70101, funded by North Ostrobothnia Centre for Economic Development, Transport and the Environment; Napapiirin Vesi ja Energia Ltd.; Napapiirin Residuum Ltd. and Rovaniemen Kehitys Ltd.).
Copyright information: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license