Revealing the hydrodynamic effects on phosphorus recovery as vivianite in stirring and aeration systems through PIV experiments and theoretical calculations

Wang, SN; Chen, YH; Ge, R; Cao, JS; Ni, BJ; Fang, F

Revealing the hydrodynamic effects on phosphorus recovery as vivianite in stirring and aeration systems through PIV experiments and theoretical calculations

Wang, SN Chen, YH Ge, R Cao, JS Ni, BJ Fang, F

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Publisher:: ELSEVIER SCIENCE SA
Publication Type:: Journal Article
Citation:: Chemical Engineering Journal, 2023, 475
Issue Date:: 2023-11-01

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Field	Value	Language
dc.contributor.author	Wang, SN
dc.contributor.author	Chen, YH
dc.contributor.author	Ge, R
dc.contributor.author	Cao, JS
dc.contributor.author	Ni, BJ
dc.contributor.author	Fang, F
dc.date.accessioned	2024-04-12T09:10:14Z
dc.date.available	2024-04-12T09:10:14Z
dc.date.issued	2023-11-01
dc.identifier.citation	Chemical Engineering Journal, 2023, 475
dc.identifier.issn	1385-8947
dc.identifier.issn	1873-3212
dc.identifier.uri	http://hdl.handle.net/10453/177856
dc.description.abstract	Hydrodynamic conditions have an essential influence on the precipitation and agglomeration processes of crystals. However, the influence of hydrodynamics under different operating conditions on vivianite crystallization is commonly ignored in the phosphorus recovery process. To this purpose, the effects of hydrodynamics on vivianite properties in stirring and aeration systems were investigated with the aid of particle image velocimetry (PIV). Hydrodynamic parameters of shear rate (G), flow velocity, Kolmogorov microscale (η), turbulent dissipation rate (ε), and turbulent kinetic energy (k) were calculated, and the generated vivianite properties were recorded. The analysis of flow field distribution showed that the mixing state under the stirring system was more homogeneous and formed a smaller hydraulic dead zone, which may be more favorable for the formation and growth of crystals. Compared with the aeration system at the same G, the stirring system has higher hydrodynamic parameters, producing stronger turbulent intensity and higher shear rate. The higher recovery efficiency, as well as larger crystal size in the stirring system, demonstrated that higher shear rates (95–309 s−1) increased the crystallization rate, ultimately improving the crystal size and settling performance. Significant relationships between hydrodynamic parameters and the harvested crystal size showed that the flow velocity, η, ε, and k were suitable hydrodynamic parameters for evaluating the growth of vivianite. This work is expected to provide the theoretical basis and technical support for the design and operation of vivianite recovery reactors.
dc.language	English
dc.publisher	ELSEVIER SCIENCE SA
dc.relation.ispartof	Chemical Engineering Journal
dc.relation.isbasedon	10.1016/j.cej.2023.146454
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 0907 Environmental Engineering
dc.subject.classification	Chemical Engineering
dc.subject.classification	4004 Chemical engineering
dc.subject.classification	4011 Environmental engineering
dc.subject.classification	4016 Materials engineering
dc.title	Revealing the hydrodynamic effects on phosphorus recovery as vivianite in stirring and aeration systems through PIV experiments and theoretical calculations
dc.type	Journal Article
utslib.citation.volume	475
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	0907 Environmental Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2024-04-12T09:10:11Z
pubs.publication-status	Published
pubs.volume	475

Abstract:

Hydrodynamic conditions have an essential influence on the precipitation and agglomeration processes of crystals. However, the influence of hydrodynamics under different operating conditions on vivianite crystallization is commonly ignored in the phosphorus recovery process. To this purpose, the effects of hydrodynamics on vivianite properties in stirring and aeration systems were investigated with the aid of particle image velocimetry (PIV). Hydrodynamic parameters of shear rate (G), flow velocity, Kolmogorov microscale (η), turbulent dissipation rate (ε), and turbulent kinetic energy (k) were calculated, and the generated vivianite properties were recorded. The analysis of flow field distribution showed that the mixing state under the stirring system was more homogeneous and formed a smaller hydraulic dead zone, which may be more favorable for the formation and growth of crystals. Compared with the aeration system at the same G, the stirring system has higher hydrodynamic parameters, producing stronger turbulent intensity and higher shear rate. The higher recovery efficiency, as well as larger crystal size in the stirring system, demonstrated that higher shear rates (95–309 s−1) increased the crystallization rate, ultimately improving the crystal size and settling performance. Significant relationships between hydrodynamic parameters and the harvested crystal size showed that the flow velocity, η, ε, and k were suitable hydrodynamic parameters for evaluating the growth of vivianite. This work is expected to provide the theoretical basis and technical support for the design and operation of vivianite recovery reactors.

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http://hdl.handle.net/10453/177856