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An optimized pathway for phosphate ions removal from aqueous solution based on experimental design methodology.

Zran, Ernest; Yao, Benjamin; Trokourey, Albert; Yobouet, Yao Augustin; Drogui, Patrick (2015). An optimized pathway for phosphate ions removal from aqueous solution based on experimental design methodology. International Journal of Environmental Science and Technology , vol. 12 , nº 10. p. 3117-3124. DOI: 10.1007/s13762-014-0738-1.

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Résumé

Wastewaters can contain residual phosphorus concentrations above the recommended limiting values, and it could have a high environmental impact. The discharge of such effluents is undesirable and can cause excessive nutrients and eutrophication in the receiving water. In order to produce an effluent suitable for stream discharge, chemical precipitation of phosphate based on a sequential experimental design has been explored. The influence of factors [pH, type of salt (calcium or iron)] involved in the co-precipitation of phosphate ions was studied by a complete factorial design. It was established that the optimal parameter values obtained from a second-order model allowed conclusion to be drawn on the effectiveness of the removal. So in the best conditions (pH 8.41 and a dose of 97.07 mg/L Ca(OH)₂ with 10 mg/L FeSO₄.7H₂O), 95.80 % (removal rate) of the phosphate ion were removed from the synthetic solution. A second-order mathematical model of the removal of phosphate ions, depending on two parameters which are pH and Ca(OH)₂ concentration, was finally proposed. Moreover, on the basis on the pH solution, it was shown that the precipitate formed was hydroxyapatite Ca₁₀(PO₄)6(OH)₂ and the scanning electron microscopy views revealed the amorphous and homogeneous aspect of the precipitates.

Type de document: Article
Mots-clés libres: eutrophication; factorial design co-precipitation; phosphate ions; removal rate; response surface methodology
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 avr. 2018 19:49
Dernière modification: 18 avr. 2018 19:49
URI: http://espace.inrs.ca/id/eprint/3704

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