Phosphorus transformations in plant-based and bio-waste materials induced by pyrolysis

Robinson, J. S., Baumann, K., Hu, Y., Hagemann, P., Kebelmann, L. and Leinweber, P. (2018) Phosphorus transformations in plant-based and bio-waste materials induced by pyrolysis. Ambio, 47 (Suppl 1). pp. 73-82. ISSN 1654-7209 doi: 10.1007/s13280-017-0990-y

Abstract/Summary

Strategies are needed to increase the sustainability of phosphorus (P) fertiliser management in agriculture. This paper reports on the potential of pyrolysis treatment to recycle P from renewable materials previously regarded as wastes. The study used K-edge X-ray absorption near-edge structure (XANES) spectroscopy to examine chemical forms of P in the waste feedstock materials and corresponding biochars (pyrolysis at 480–500 °C) of four ligno-cellulosic, plant-based residues and five relatively P-rich livestock and water-treatment by-products, to acquire information on changes in potential P fertiliser value. Pyrolysis enriched P in the biochars by factors of 1.3–4.3, thus offering wide-ranging P fertiliser potential. XANES spectroscopy revealed hydroxyapatite (HAP) as one of the dominant chemical P compounds in the feedstocks, ranging from 14% (rice husks) to 98% (animal bone) of total P. For most materials, pyrolysis increased the proportion of HAP, and pyrophosphates were generated in several cases. These alterations possibly lead to diversity in the P solubility characteristics of the biochars if used as soil amendments; this is an important property of environmentally sound P fertilisers.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/74347
Identification Number/DOI	10.1007/s13280-017-0990-y
Refereed	Yes
Divisions	Science > School of Archaeology, Geography and Environmental Science > Department of Geography and Environmental Science
Uncontrolled Keywords	Article, Biochar, Bio-waste, Fertiliser, Phosphorus
Publisher	Springer Netherlands
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