Study of the Crystallisation Reaction Behaviour to Obtain Struvite

Abstract The potential of N and P recovering from digestate by means its precipitation in the form struvite is evident. However, it necessary to optimise process at a larger scale, achieve results that can be extrapolated evaluate technical economic feasibility an industrial scale. In this work, batch pilot plant tests were carried out order consolidate, sufficiently relevant obtained lab For purpose, parameters have greatest effect on reaction yield fludised bed reactor selected (Mg concentration, flow rate fluidising agent (air) time). Digestate produced anaerobic digestion pig manure was used as raw material. According obtained, for crystallisation reaction, great operational levels Mg/P, N/P, air time are 1.5, 4.0, 6.0 NL·min ?1 0.5 h, respectively. Finally, study establish agronomic salt (struvite) biofertiliser turf crop, obtaining similar behaviour work commercial struvite. Graphical