University of Oulu

Pesonen, J.; Rautio, P. New Nitrogen-Containing Recycled Fertilizers: Bioavailability of Nutrients and Harmful Elements. Recycling 2019, 4, 17.

New nitrogen-containing recycled fertilizers : bioavailability of nutrients and harmful elements

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Author: Pesonen, Janne1; Rautio, Pasi2
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
2Natural Resource Institute Finland, Ounasjoentie 6, FI-96200 Rovaniemi, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2019
Publish Date: 2019-06-19


Environmental policies of the European Union aim to increase recycling and re-use of waste-streams. One of the economically most profitable ways of re-using waste is to use it as a fertilizer. In this study, recycled nitrogen fertilizers were manufactured from industrial side-streams (sawdust, fly-ash, ammonium sulfate and lignosulfonate). A sequential extraction procedure was applied to all the products tested in this paper to make sure that the environmental requirements of a recycled fertilizer would be fulfilled. A mass fraction of up to 7.0% of nitrogen was achieved with sawdust granule and 7.2% with fly-ash-sawdust granule, indicating that the granules would be well suited to be used as nitrogen-containing fertilizers. Nitrogen release from sawdust granule was more controlled than from commercial salpetre. Sawdust combined with fly-ash can hence give a balanced nutrient mix when used together. Bioavailabilities and pseudo-total contents of harmful elements (As, Cd, Cr, Cu, Ni, Pb, and Zn) were small in all granules and cause no harm in field or forest fertilizer use.

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Series: Recycling
ISSN: 2313-4321
ISSN-E: 2313-4321
ISSN-L: 2313-4321
Volume: 4
Issue: 2
Article number: 17
DOI: 10.3390/recycling4020017
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
218 Environmental engineering
415 Other agricultural 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: © 2019 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).