title: Effect of incineration temperature on phosphorus availability in bio-ash from manure.
abstract: In the near future phosphorus (P) will be a limited resource in high demand. This will increase the incentives for recycling P in animal manure. In this study the dry-matter-rich fraction from slurry separation was incinerated and the P availability of the ash fraction examined. The aim was to adjust incineration temperature to support a high plant-availability of P in ash. The plant-availability of P was approximately halved when the incineration temperature was increased from 400 to 700 degrees C. This decrease in plant-availability was probably due to the formation of hydroxyapatite. Incineration temperatures should therefore be kept below 700 degrees C to ensure a high fertilizer efficiency of P in ash. This may conflict with the energy production, which is optimal at temperatures above 800 degrees C. An alternative to incineration may therefore be thermal gasification of the dry-matter-rich fraction, which can be carried out efficiently at lower temperatures.
authors.affiliation: Department of Chemical Engineering, Biotechnology and Environmental Technology, Faculty of Engineering, University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark.
authors.forename: A M
authors.initials: AM
authors.lastname: Thygesen
authors.forename: O
authors.initials: O
authors.lastname: Wernberg
authors.forename: E
authors.initials: E
authors.lastname: Skou
authors.forename: S G
authors.initials: SG
authors.lastname: Sommer
mesh_terms: D000818:Animals; D017745:Incineration / Q000379:methods*; D008372:Manure; D010710:Phosphates / Q000032:analysis / Q000737:chemistry*; D013696:Temperature
chemical_list: D008372:Manure; D010710:Phosphates