Phosphorus recovery from animal manure: Technical opportunities and agro-economical perspectives
By Schoumans O.F , W.H. Rulkens, O. Oenema, and P.A.I Ehlert 2010. Phosphorus recovery from animal manure; Technical opportunities and agro-economical perspectives. Wageningen, Alterra, Alterra report 2158. 110 pages; 4 figs,; 10 tables.; 73 refs.
Keywords: manure, phosphate, phosphorus, recovert, treatment, separation, digestion, drying, incineration, pyrolysis, ash, biochar.
The report ”Phosphorus recovery from animal manure” sums up recent years research concerning the removal of phosphorus from pig slurry.The studies have been made in co-operation with waste and phosphorus processing companies.
Abstract from the report:
All options start with the seperation of slurries in a liquid solid fraction, with or without an initial anaerobic digestion for biogas recovery. The solid fraction contains most of the phosphorus and organic matter, and the liquid fraction contains most of the soluble salts including nitrogen. The solid fraction can be used directly for soil amendment, or for bio-energy production through incineration or pyrolysis with a subsequent recovery of phosphorus from ashes and biochar.
From a technical point of view, there are many opportunities for energy, phosphorus and nitrogen recovery from pig slurry via various processing treatments. However, the separation of manure in liquid and solid fractions, drying of the solid fraction and the transport of liquid and solid fractions are associated with relatively high economic costs. The agro-economical perspectives of manure processing highly depend on the prices of crude oil and phosphorus fertilizers, the environmental and legal restrictions and alternatives of manure disposal.
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