Kinetic conditions of struvite continuous reaction crystallisation from wastewater in presence of aluminium(III) and iron(III) ions

Hutnik, N.; Stanclik, Anna; Piotrowski, Krzysztof; Matynia, A.

doi:10.1504/ijep.2018.099466

Cited by 3 publications

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“…This model is based on the population balance equation. It is a method used to estimate the kinetic parameters of the crystallization of struvite, which depend on the crystal size distribution (CSD) of the product [ 17 , 25 , 26 ]. The crystal growth rate and nucleation rate affect CSD in solution, which is the key to control the quality of struvite [ 27 ].…”

Section: Model Of Struvite Crystallizationmentioning

confidence: 99%

“…In the MSMPR model, the population density of the mean size of struvite crystal

based on CSD data. The model is described by the following equation [ 17 ]:

where

denotes the mean size of the ith crystal;

is the mass of the crystal;

is the volume of the crystal;

is the shape factor;

is the density of the crystal;

denotes the crystal size range;

is the total volume of the system.…”

Section: Model Of Struvite Crystallizationmentioning

confidence: 99%

“…When the concentration of aluminum ions was increased from 10 to 100 mg/L, the nucleation rate of struvite decreased by 5%. In contrast, the linear growth rate of struvite crystals increased by 8%, and the average size of crystals increased by 22% [ 17 ]. In addition, Hutnik et al [ 65 ] reported that the existence of K + increases the growth rate of struvite crystal, and the average size of struvite was about 46 um.…”

Section: The Parameters That Influence Struvite Crystallizationmentioning

confidence: 99%

“…Currently, the dynamic kinetics of struvite crystallization are described by the following models: the population density model [ 17 ], the surface growth model [ 18 ], and the first-order dynamic model of substrate concentration [ 19 ]. Furthermore, the population density model describes how the total rate of change in the crystal number occurs due to variations in following parameters: diameter, surface area, volume, shape, etc.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Physicochemical Parameters on Struvite Crystallization Based on Kinetics

et al. 2022

IJERPH

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The precipitation of struvite (MgNH4PO4·6H2O) is considered to be a promising method for the recovery of phosphate from wastewater. In this review, the kinetic models, which are commonly used to explain the process of struvite crystallization, are described. The mixed-suspension mixed-product removal (MSMPR) model is based on the population balance equation (the size-dependent growth model and the size-independent growth model). Thereafter, the first-order kinetic fitting model that aligned with concentration changes in the substrate is summarized. Finally, the several physical and chemical factors that affected the efficiency of struvite crystallization are determined. The supersaturation ratio, which is seen as the driving force of struvite crystallization, is the main factor that influences crystallization; however, it cannot be used in practical applications of engineering because it is indirectly associated with the following factors: pH, the molar ratio of Mg:N:P, and the interference of foreign impurities. In this study, we present conclusions that should be used to guide further research studies, and encourage the engineering practice of wastewater treatment with struvite precipitation.

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Section: Model Of Struvite Crystallizationmentioning

confidence: 99%

“…In the MSMPR model, the population density of the mean size of struvite crystal

based on CSD data. The model is described by the following equation [ 17 ]:

where

denotes the mean size of the ith crystal;

is the mass of the crystal;

is the volume of the crystal;

is the shape factor;

is the density of the crystal;

denotes the crystal size range;

is the total volume of the system.…”

Section: Model Of Struvite Crystallizationmentioning

confidence: 99%

Section: The Parameters That Influence Struvite Crystallizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Physicochemical Parameters on Struvite Crystallization Based on Kinetics

et al. 2022

IJERPH

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Effects of heavy metal ions Cu2+/Pb2+/Zn2+ on kinetic rate constants of struvite crystallization

Huang

Zhou

Zhang

et al. 2023

Chinese Journal of Chemical Engineering

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Optimizing Struvite Crystallization at High Stirring Rates

2023

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Phosphorus and ammonium can both be recovered in the presence of magnesium through struvite (MgNH4PO4·6H2O) crystallization. The present work aimed to optimize struvite crystallization at turbulent solution flow. Struvite was crystallized by magnetic stirring at different initial phosphorus concentrations between 200 and 800 mg·L−1 and high stirring rates between 100 and 700 rpm. The crystals obtained were analyzed by powder X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. For all experiments, the only phase detected was struvite. It was shown that for an initial phosphorus concentration of 200 mg·L−1, increasing the stirring rate to 500 rpm accelerated the precipitation of struvite, improved the phosphorus removal efficiency, and obtained larger struvite crystals. A decrease in the phosphorus removal efficiency and smaller struvite crystals were obtained at higher stirring rates. This was attributed to the solution turbulence. The limiting effect of turbulence could be overcome by enhancing the initial phosphorus concentration or by lowering the stirring rate. The highest phosphorus removal efficiency (~99%) through large struvite crystals (~400 μm in size) was obtained for an initial phosphorus concentration of 800 mg·L−1 and a stirring rate of 100 rpm.

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Kinetic conditions of struvite continuous reaction crystallisation from wastewater in presence of aluminium(III) and iron(III) ions

Cited by 3 publications

References 0 publications

Effects of Physicochemical Parameters on Struvite Crystallization Based on Kinetics

Effects of Physicochemical Parameters on Struvite Crystallization Based on Kinetics

Effects of heavy metal ions Cu2+/Pb2+/Zn2+ on kinetic rate constants of struvite crystallization

Optimizing Struvite Crystallization at High Stirring Rates

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