title: Modelling of phosphorus removal from aqueous and wastewater samples using ferric iron.
abstract: Batch laboratory scale experiments were conducted to investigate the removal of phosphate from aqueous and municipal wastewater samples by addition of FeCl(3).6H(2)O. 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.
authors.affiliation: Environmental Pollution Control Laboratory, Chemistry Department, University of Thessaloniki, 540 06 Thessaloniki, Greece.
authors.forename: K
authors.initials: K
authors.lastname: Fytianos
authors.forename: E
authors.initials: E
authors.lastname: Voudrias
authors.forename: N
authors.initials: N
authors.lastname: Raikos