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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 12, No. 10, 2015, pp. 3117-3124
Bioline Code: st15295
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 12, No. 10, 2015, pp. 3117-3124

 en An optimized pathway for phosphate ions removal from aqueous solution based on experimental design methodology
Zran, E.; Yao, B.; Trokourey, A.; Yobouet, A. & Drogui, P.

Abstract

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 secondorder 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.

Keywords
Eutrophication; Phosphate ions; Response surface methodology; Factorial design co-precipitation; Removal rate

 
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