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Phosphorus transformations in plant- and bio-waste feedstocks induced by pyrolysis: Implications for fertilizer replacement potential
Autor: Robinson, S., K. Baumann, L. Kebelmann, P. Hagemann, Y. Hu, P. Leinweber
In:
Ambio
Bandangabe: 47 (Suppl 1)
ISBN: 0044-7447
Seite: 73 - 82
Jahr: 2018
Einordung:
Institut: Professur Bodenkunde
Abstract:
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. Ansprechpartner Weitere Information im WWW
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Letzte Änderung des Eintrages:
30.01.2019
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