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Donnish Journal of Pure and Applied Chemistry

April 2015 Vol. 1(1), pp. 008-019

Copyright 2015 Donnish Journals




Original Research Paper


Study of Ca2+, K+, and Fe3+ ions Influence on Struvite Precipitation from Synthetic Water by Dissolved CO2 Degasification Technique


1,2,3Hassidou Saidou*, 2,3Atef Korchef, 2Sami Ben Moussa and 2Mohamed Ben Amor

1Department of Chemistry, Faculty of Sciences and Techniques, University of Maradi, Niger.
2Laboratory of Natural Water Treatment, Water Research and Technology Centre, Technopark of Borj-Cedria, Tunisia.
3Laboratory of Valorization of Useful Materials, National Centre of Research in Material Sciences, Technopark of Borj-Cedria, Tunisia.

Corresponding Author E-mail: saidouhassidou@gmail.com

Accepted 20th March, 2015.



Abstract


The influence of Ca2+, K+, and Fe3+ on struvite precipitation was investigated in this study, by dissolved CO2 degasification technique. The results obtained showed that increasing the calcium ions improved phosphates removal efficiency and the precipitated solid changes from crystalline phase (struvite) to an amorphous one, identified as Ca9(PO4)6 ∙nH2O from an initial Ca2+ concentration of 4 mM. However, the formation of this amorphous phase preceded the struvite formation in the Ca2+ concentration range of [2.5 -3.5 mM]. The increase in Ca2+ concentration from 2 to 4 mM approaches a homogeneous distribution of the average particle size. Increasing the concentration of K+ improves phosphates removal yield, and did not affect the purity of the struvite obtained. The introduction of Fe3+ in the solution causes enormous change both on physicochemical parameters and on the morphology of the precipitate obtained. Indeed, the increase in the molar ratio destroyed struvite crystallization immediately and formed an amorphous phase identified as FePO4∙2H2O at pH 6.5 and Fe3+/PO43- molar ratio ≥ 1. Furthermore, the presence of Fe3+ promoted the increasing particle size of the two phases (crystalline and amorphous). It should be noted that the yield of phosphate removal is better when forming the amorphous phase.

Keywords: Dissolved CO2 degasification technique, Synthetic water, Struvite, Ca2+, K+, Fe3+

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Cite This Article:

Hassidou Saidou, Atef Korchef, Sami Ben Moussa and Mohamed Ben Amor. H. Almgheer. Study of Ca2+, K+, and Fe3+ ions Influence on Struvite Precipitation from Synthetic Water by Dissolved CO2 Degasification Technique. Donnish Journal of Pure and Applied Chemistry 1(1) 2015 pp. 008-019.


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