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