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Designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification

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Designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification. / Zhang, Yi; Grassia, Paul; Martin, Alastair; Usher, Shane P.; Scales, Peter J.

In: Chemical Engineering Science, Vol. 134, 29.09.2015, p. 297-307.

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Zhang, Yi ; Grassia, Paul ; Martin, Alastair ; Usher, Shane P. ; Scales, Peter J. / Designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification. In: Chemical Engineering Science. 2015 ; Vol. 134. pp. 297-307.

Bibtex

@article{1c95e99791694a679766272f6c67c65d,
title = "Designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification",
abstract = "A model is presented for design of a thickener for solid-liquid separation where the flocs or aggregates within the solid-liquid suspension undergo an aggregate densification process due to the action of rakes. This aggregate densification facilitates suspension dewatering. The novel feature of the model is that it manages to couple together a hindered settling zone (higher up in the thickener, where the flocs are separated from one another, and the suspension cannot bear weight) and a gelled suspension zone (lower down in the thickener, where the flocs are packed together, and the suspension is able to bear weight). The model determines solids fraction profiles throughout the hindered settling zone and the gelled suspension zone, and also gives zone heights and residence times. Parametric investigations using the model are carried out for different suspension fluxes (which influence the solids fluxes and underflow solids fractions attained), and also for different specified amounts of and rates of aggregate densification. ",
keywords = "Gels, Mathematical modelling, Rheology, Suspension, Compressive yield stress, Hindered settling function, COMPRESSIVE YIELD-STRESS, FLOCCULATED SUSPENSIONS, RESOURCE INDUSTRIES, SEDIMENTATION, CONSOLIDATION, PERFORMANCE, SLUDGE",
author = "Yi Zhang and Paul Grassia and Alastair Martin and Usher, {Shane P.} and Scales, {Peter J.}",
year = "2015",
month = sep,
day = "29",
doi = "10.1016/j.ces.2015.05.016",
language = "English",
volume = "134",
pages = "297--307",
journal = "Chemical Engineering Science",
issn = "0009-2509",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification

AU - Zhang, Yi

AU - Grassia, Paul

AU - Martin, Alastair

AU - Usher, Shane P.

AU - Scales, Peter J.

PY - 2015/9/29

Y1 - 2015/9/29

N2 - A model is presented for design of a thickener for solid-liquid separation where the flocs or aggregates within the solid-liquid suspension undergo an aggregate densification process due to the action of rakes. This aggregate densification facilitates suspension dewatering. The novel feature of the model is that it manages to couple together a hindered settling zone (higher up in the thickener, where the flocs are separated from one another, and the suspension cannot bear weight) and a gelled suspension zone (lower down in the thickener, where the flocs are packed together, and the suspension is able to bear weight). The model determines solids fraction profiles throughout the hindered settling zone and the gelled suspension zone, and also gives zone heights and residence times. Parametric investigations using the model are carried out for different suspension fluxes (which influence the solids fluxes and underflow solids fractions attained), and also for different specified amounts of and rates of aggregate densification.

AB - A model is presented for design of a thickener for solid-liquid separation where the flocs or aggregates within the solid-liquid suspension undergo an aggregate densification process due to the action of rakes. This aggregate densification facilitates suspension dewatering. The novel feature of the model is that it manages to couple together a hindered settling zone (higher up in the thickener, where the flocs are separated from one another, and the suspension cannot bear weight) and a gelled suspension zone (lower down in the thickener, where the flocs are packed together, and the suspension is able to bear weight). The model determines solids fraction profiles throughout the hindered settling zone and the gelled suspension zone, and also gives zone heights and residence times. Parametric investigations using the model are carried out for different suspension fluxes (which influence the solids fluxes and underflow solids fractions attained), and also for different specified amounts of and rates of aggregate densification.

KW - Gels

KW - Mathematical modelling

KW - Rheology

KW - Suspension

KW - Compressive yield stress

KW - Hindered settling function

KW - COMPRESSIVE YIELD-STRESS

KW - FLOCCULATED SUSPENSIONS

KW - RESOURCE INDUSTRIES

KW - SEDIMENTATION

KW - CONSOLIDATION

KW - PERFORMANCE

KW - SLUDGE

U2 - 10.1016/j.ces.2015.05.016

DO - 10.1016/j.ces.2015.05.016

M3 - Journal article

VL - 134

SP - 297

EP - 307

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

ER -