Stochastic flocculation of cohesive sediment: Analysis of floc mobility within the floc size spectrum

The Effect of Impeller Type on Floc Size and Structure during Shear-Induced Flocculation

The effect of impeller type and shear rate on the evolution of floc size and structure during shear-induced flocculation of polystyrene particles with aluminum sulfate is investigated by image analysis. One radial flow (six-blade Rushton turbine) and two axial flow (three-blade fluid foil, four-blade 45° pitch) impeller configurations are examined. The steady state average floc size is show...

Image Processing Methods for in Situ Estimation of Cohesive Sediment Floc Size, Settling Velocity, and Density 2

Structural analysis of sludge floc

Free settling tests, small angle light scattering (SALS), microtome-slicing techniques, and confocal laser scanning microscopy (CLSM) were performed to examine how the cationic flocculation or freezing and thawing affected the floc structure. The floc size, internal pore size, mass fractal dimensions determined from free-settling test or small angle light scattering test, aeral porosity, bounda...

Stochastic Flocculation Model for Cohesive Sediment Suspended in Water

Existing flocculation models for cohesive sediments are classified into two groups: population balance equation models (PBE) and floc growth models. An FGM ensures mass conservation in a closed system. However, an FGM determines only the average size of flocs, whereas a PBE has the capability to calculate a size distribution of flocs. A new stochastic approach to model the flocculation process ...

Fibre Floc Morphology and Dewaterability of a Pulp Suspension: Role of Flocculation Kinetics and Characteristics of Flocculation Agents

The aim of this investigation was to find out how properties of a flocculation agent and flocculation kinetics affect the morphology of fibre flocs and how dewatering of a fibre suspension may be attributed to floc morphology. Fibre flocculation, analysed in terms of floc size, mass fractal dimension, floc strength, and the kinetic constant of flocculation, was measured with a digital image ana...