Open AccessNucleation and Crystal Growth Rates of Struvite in DTM Type Crystallizer with a Jet-Pump of Descending Suspension Flow in a Mixing Chamber
Author(s) -
J. Koralewska,
Krzysztof Piotrowski,
B. Wierzbowska,
A. Matynia
Publication year - 2007
Publication title -
american journal of agricultural and biological sciences
Language(s) - English
Resource type - Journals
eISSN - 1557-4997
pISSN - 1557-4989
DOI - 10.3844/ajabssp.2007.260.266
Subject(s) - nucleation , crystallization , suspension (topology) , chemistry , precipitation , struvite , jet (fluid) , ion , kinetic energy , crystal growth , mixing (physics) , thermodynamics , analytical chemistry (journal) , materials science , magnesium , crystallography , chromatography , physics , mathematics , meteorology , quantum mechanics , homotopy , pure mathematics , organic chemistry
The kinetic data concerning reaction crystallization of struvite from diluted water solutions of Mg2+, NH4+ and PO43 ions in a continuous DTMtype liquid jet-pump crystallizer with internal circulation of suspension are presented and discussed. The measurements were performed with the assumption of minimal value of unit power of a jet-pumps feeding stream, providing thus a minimal level of internal circulation intensity. Nucleation and linear growth rates of struvite crystals were calculated on the basis of population density distributions of product particles. A mathematically convenient kinetic model for MSMPR crystallizer, making allowance for a size dependent growth (SDG) phenomenon, was adopted for description of a complex process of precipitation integrated with crystals growth. It was concluded, that in the concentration range of magnesium ions in a feeding solution [Mg2+]RM = 0.1 2.0 mass % and, in stoichiometric proportions, phosphate ions [PO43]RM = 0.39 7.81 mass % as well as the ammonium ions [NH4+]RM = 0.074 1.48 mass %, the Rojkowski hyperbolic SDG kinetic model proved to be an equation the best statistically fitted to the own experimental data