title: A dynamic physicochemical model for chemical phosphorus removal.
abstract: A dynamic physico-chemical model for chemical phosphorus removal in wastewater is presented as a tool to optimize chemical dosing simultaneously while ensuring compliant effluent phosphorus concentration. This new model predicts the kinetic and stoichiometric variable processes of precipitation of hydrous ferric oxides (HFO), phosphates adsorption and co-precipitation. It is combined with chemical equilibrium and physical precipitation reactions in order to model observed bulk dynamics in terms of pH. The model is calibrated and validated based on previous studies and experimental data from Smith et al. (2008) and Szabo et al. (2008) as a first step for full-plant implementation. The simulation results show that the structure of the model describes adequately the mechanisms of adsorption and co-precipitation of phosphate species onto HFO and that the model is robust under various experimental conditions.
authors: Université de Toulouse, INSA, UPS, INP, LISBP 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France; CNRS, UMR5504, F-31400 Toulouse, France. Electronic address: Helene.Hauduc@insa-toulouse.fr.
authors: H
authors: H
authors: Hauduc
authors: Dynamita, Nyons, France. Electronic address: imre@dynamita.com.
authors: I
authors: I
authors: Takács
authors: Wilfrid Laurier University, Waterloo, Ontario, Canada. Electronic address: Ssmith@wlu.ca.
authors: S
authors: S
authors: Smith
authors: Inno-Water Ltd., Budapest, Hungary. Electronic address: Szabo.Anita@innowater.hu.
authors: A
authors: A
authors: Szabo
authors: DCWater, Washington, DC, USA. Electronic address: Sudhir.Murthy@dcwater.com.
authors: S
authors: S
authors: Murthy
authors: CH2MHill, Denver, CO, USA. Electronic address: Glen.Daigger@ch2m.com.
authors: G T
authors: GT
authors: Daigger
authors: Université de Toulouse, INSA, UPS, INP, LISBP 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France; CNRS, UMR5504, F-31400 Toulouse, France. Electronic address: Mathieu.Sperandio@insa-toulouse.fr.
authors: M
authors: M
authors: Spérandio
mesh_terms: D000327:Adsorption; D011232:Chemical Precipitation; D007700:Kinetics; D008956:Models, Chemical; D010710:Phosphates / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D010710:Phosphates; D014874:Water Pollutants, Chemical; D010758:Phosphorus
keywords: Chemical phosphorus removal; Ferric chloride; Hydrous ferric oxide; Phosphate adsorption; Physicochemical modelling