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Influence of tempereature on Struvite precipitation by CO 2 ‐deagassing method
Author(s) -
Ben Moussa S.,
Tlili M. M.,
Batis N.,
Amor M. Ben
Publication year - 2011
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201000571
Subject(s) - supersaturation , struvite , arrhenius equation , activation energy , chemistry , nucleation , arrhenius plot , solubility , kinetics , precipitation , thermodynamics , reaction rate constant , analytical chemistry (journal) , phosphate , chromatography , organic chemistry , physics , meteorology , quantum mechanics
The present study explores struvite precipitation by degassing method under different temperature (14.5‐35 °C). It is shown that an increase of temperature does not affect the nucleation kinetics but strongly influences the growth rate and the efficiency of the phosphate removal. This was attributed to the effect of temperature on the struvite solubility and then the reached supersaturation coefficient. It was also shown, by using degassing method, that the determined solubility constant ( pK s ) values of struvite, at 14.5, 20, 25 and 35 °C are 13.00, 12.82, 12.63 and 13.20, respectively, are close to those presented in the literature. The results show that temperature influences the kinetics of precipitation. First‐order kinetics were found to be sufficient to describe the rate data. The rates decreased with increasing temperature and the apparent rate constants for the reaction were determined. Arrhenius plots yielded a relatively apparent high activation energy E a = 31.0 kJ·mol –1 . (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)