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RESEARCH PRODUCT

Modelling biological and chemically induced precipitation of calcium phosphate in enhanced biological phosphorus removal systems

Aurora SecoJosé FerrerT. MontoyaRamón Barat

subject

Precipitation (chemical)Waste component removalCalcium PhosphatesKinematicsPrecipitation (chemistry)Sequencing batch reactorWastewater treatmentPrecipitationActivated sludge modelWastewaterChemicals removal (water treatment)Precipitation processchemistry.chemical_compoundMathematical modelCalcium ionAqueous solutionChemical PrecipitationAmorphous calcium phosphateChemical equilibriumsEnvironmental RemediationWaste Management and DisposalEnvironmental Restoration and RemediationCalcium concentrationPriority journalWater Science and TechnologyWaste water managementMathematical modellingChemistryEcological ModelingPhosphorusPollutionRaw wastewatersSequencing batch reactorAmorphous calcium phosphateBiodegradation EnvironmentalEnhanced biological phosphorus removalPollutant removalCalibrationCrystallizationEnvironmental EngineeringInorganic chemistryAqueous phase reactionschemistry.chemical_elementArticleHydroxyapatitePhosphatesNumerical modelSolidChemical engineeringPhysicochemical propertyComputer SimulationCalcium phosphate precipitationBiological water treatmentTECNOLOGIA DEL MEDIO AMBIENTECivil and Structural EngineeringActivated sludge modelActivated sludge processBatch reactorsPrecipitation (chemistry)PhosphorusPrecipitation modelPhosphateChemical processKineticsActivated sludgeCalcium phosphateModels ChemicalActivated sludgePotassiumEnhanced biological phosphorus removalCalciumExperimentsSequencing batch reactorsCalcium phosphate dibasicHydrogen

description

The biologically induced precipitation processes can be important in wastewater treatment, in particular treating raw wastewater with high calcium concentration combined with Enhanced Biological Phosphorus Removal. Currently, there is little information and experience in modelling jointly biological and chemical processes. This paper presents a calcium phosphate precipitation model and its inclusion in the Activated Sludge Model No 2d (ASM2d). The proposed precipitation model considers that aqueous phase reactions quickly achieve the chemical equilibrium and that aqueous-solid change is kinetically governed. The model was calibrated using data from four experiments in a Sequencing Batch Reactor (SBR) operated for EBPR and finally validated with two experiments. The precipitation model proposed was able to reproduce the dynamics of amorphous calcium phosphate (ACP) formation and later crystallization to hydroxyapatite (HAP) under different scenarios. The model successfully characterised the EBPR performance of the SBR, including the biological, physical and chemical processes. © 2011 Elsevier Ltd.

yearjournalcountryeditionlanguage
2011-01-01Water Research
https://doi.org/10.1016/j.watres.2011.04.028