Journal ArticleDOI
Mathematical modelling of time-dependent densified thickeners
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TLDR
In this article, a one dimensional dewatering model for a thickener consistent with time-dependent densification of aggregates within a sludge suspension has been developed, and the effects of different densification rate parameters and different underflow solids fluxes on the predictions of the sludge rheological properties and thickener performance have been explored.About:
This article is published in Chemical Engineering Science.The article was published on 2013-08-09. It has received 8 citations till now. The article focuses on the topics: Arithmetic underflow.read more
Citations
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Journal ArticleDOI
Effect of settling test procedure on sizing thickeners
TL;DR: In this paper, the effect of flocculation history, defined as the initial solids concentration where the flocs first were formed, on their settling velocity was investigated using batch settling tests.
Journal ArticleDOI
Mathematical modelling of batch sedimentation subject to slow aggregate densification
TL;DR: In this article, the authors considered an initially networked suspension in a batch settler subjected to very slow aggregate densification and showed that the suspension height approaches the consolidated bed height far more quickly when using weak gel formula than when using strong gel one.
Journal ArticleDOI
Effects of aggregate densification upon thickening of Kynchian suspensions
Paul Grassia,Yi Zhang,Alastair Martin,Shane P. Usher,Peter J. Scales,Adam H. Crust,Rudolf Spehar +6 more
TL;DR: In this article, a model for the thickening of a raked suspension is presented, which is based on Kynch theory (Kynch, 1952 ), i.e. it describes systems with solids fractions sufficiently low that the solids have not gelled into a weightbearing network.
Journal ArticleDOI
Designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification
TL;DR: In this article, a model 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 is presented.
Dissertation
Optimisation of thickener performance: incorporation of shear effects
TL;DR: In this article, the authors investigated the effect of shear on dewatering in a polymer flocculated calcite as a representative mineral suspension and further analyzed using novel analysis methods based on modifications to current techniques such as predictive modelling and densification analysis developed by van Deventer.
References
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Journal ArticleDOI
The consolidation of concentrated suspensions. Part 1.—The theory of sedimentation
Richard Buscall,Lee R. White +1 more
TL;DR: In this paper, the concentration or consolidation of suspensions of fine particles under the influence of a gravitational field has been analyzed and a constitutive equation is suggested for irreversibly flocculated suspensions undergoing consolidation which embodies the concept of a concentration-dependent yield stress Py(ϕ).
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Rheology and the resource industries
TL;DR: In this paper, an overview of thirty years of work with the resource industries on environmental waste minimisation can be found, and the authors conclude that a greater positive change in the waste management practice will occur in the future, motivated by a number of factors, including public perception and perhaps even by common sense accounting.
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The continuous‐flow gravity thickener: Steady state behavior
TL;DR: In this paper, the equations governing consolidation in a continuous-flow gravity thickener are developed based on the assumption that a flocculated suspension possesses a compressive yield stress Py(ϕ) that is a function of local volume fraction only.
Journal ArticleDOI
Steady state thickener modelling from the compressive yield stress and hindered settling function
Shane P. Usher,Peter J. Scales +1 more
TL;DR: In this article, an algorithm was developed to predict steady-state thickener operation from fundamental material properties, properly accounting for compression of the suspension network structure within the sediment bed, including compressive yield stress and hindered settling function.
Journal ArticleDOI
Numerical methods for the simulation of the settling of flocculated suspensions
TL;DR: In this article, finite difference methods and methods based on operator splitting are used to simulate the settling of flocculated suspensions in the phenomenological theory of sedimentation of liquid suspensions.