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Recycling slaughterhouse waste into fertilizer: how do pyrolysis temperature and biomass additions affect phosphorus availability and chemistry?
- Source :
-
Journal of the Science of Food & Agriculture . Jan2015, Vol. 95 Issue 2, p281-288. 8p. - Publication Year :
- 2015
-
Abstract
- BACKGROUND Pyrolysis of slaughterhouse waste could promote more sustainable phosphorus (P) usage through the development of alternative P fertilizers. This study investigated how pyrolysis temperature (220, 350, 550 and 750 °C), rendering before pyrolysis, and wood or corn biomass additions affect P chemistry in bone char, plant availability, and its potential as P fertilizer. RESULTS Linear combination fitting of synchrotron-based X-ray absorption near edge structure spectra demonstrated that higher pyrolysis temperatures decreased the fit with organic P references, but increased the fit with a hydroxyapatite ( HA) reference, used as an indicator of high calcium phosphate ( CaP) crystallinity. The fit to the HA reference increased from 0% to 69% in bone with meat residue and from 20% to 95% in rendered bone. Biomass additions to the bone with meat residue reduced the fit to the HA reference by 83% for wood and 95% for corn, and additions to rendered bone by 37% for wood. No detectable aromatic P forms were generated by pyrolysis. High CaP crystallinity was correlated with low water-extractable P, but high formic acid-extractable P indicative of high plant availability. Bone char supplied available P which was only 24% lower than Triple Superphosphate fertilizer and two- to five-fold higher than rock phosphate. CONCLUSION Pyrolysis temperature and biomass additions can be used to design P fertilizer characteristics of bone char through changing CaP crystallinity that optimize P availability to plants. © 2014 Society of Chemical Industry [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00225142
- Volume :
- 95
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of the Science of Food & Agriculture
- Publication Type :
- Academic Journal
- Accession number :
- 99730515
- Full Text :
- https://doi.org/10.1002/jsfa.6716