Study of Cd2+, Al3+, and SO42− Ions Influence on Struvite Precipitation from Synthetic Water by Dissolved CO2 Degasification Technique


The effect of cadmium, aluminum, and sulphate ions on struvite precipitation kinetics and morphology of solids obtained was investigated in this study. Thus, these ions were introduced as additives in solution where struvite precipitation was achieved. The main results obtained showed that the Cd2+ ions cause the probable co-formation, with struvite, of an amorphous phase observed from Cd2+ concentration of 10 mg/L; the addition of aluminum ions in the solution does not affect the nature of the crystalline phase, identified as struvite. However, these ions cause the formation of agglomerates of larger and larger as the concentration rises. Moreover, their increasing improved significantly the yield of phosphates removal; although the sulfate ions have no effect on the nature of the precipitated phase identified as struvite, independently of molar ratio studied, they affect the thermal decomposition of struvite. This latter is done in a single step by increasing the concentration of these ions for the SO42−/PO43− molar ratio of 8.

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Saidou, H. , Korchef, A. , Moussa, S. and Amor, M. (2015) Study of Cd2+, Al3+, and SO42− Ions Influence on Struvite Precipitation from Synthetic Water by Dissolved CO2 Degasification Technique. Open Journal of Inorganic Chemistry, 5, 41-51. doi: 10.4236/ojic.2015.53006.

Conflicts of Interest

The authors declare no conflicts of interest.


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