Modelling of phosphorus removal from aqueous and wastewater samples using ferric iron

Batch laboratory scale experiments were conducted to investigate the removal of phosphate from aqueous and municipal wastewater samples by addition of FeCl 3.6H 2O. The effect of pH, Fe-dose and initial phosphate concentration were assessed. Optimum phosphate removal, 63% for 1:1 molar addition of F...

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Bibliographic Details
Published in:Environmental pollution (1987) 1998, Vol.101 (1), p.123-130
Main Authors: Fytianos, K., Voudrias, E., Raikos, N.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Iron addition
Mathematical modelling
Municipal wastewater
Other wastewaters
Phosphorus removal
Pollution
Wastewaters
Water treatment and pollution
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Summary:Batch laboratory scale experiments were conducted to investigate the removal of phosphate from aqueous and municipal wastewater samples by addition of FeCl 3.6H 2O. The effect of pH, Fe-dose and initial phosphate concentration were assessed. Optimum phosphate removal, 63% for 1:1 molar addition of Fe(III) was observed at pH 4.5. However, a 155% excess of Fe-dose was necessary for complete phosphorus removal. Phosphorus removal from municipal wastewater was slightly higher than that observed for the aqueous solutions. A chemical precipitation mathematical model was developed and tested with the available experimental data. The model included a total of 15 chemical reactions and 4 solid phases with the option of single-phase precipitation or two-phase co-precipitation. The resulting system of non-linear algebraic equations was solved numerically, using the Wijngaarden-Dekker-Brent method.
ISSN:0269-7491
1873-6424
DOI:10.1016/S0269-7491(98)00007-4