Batch Settling of Flocculated Clay Slurry

Abstract

This study employs a computerized axial tomography scanner (CATSCAN) to measure the spatiotemporal distributions of solidosity for a clay slurry flocculated with a cationic polyelectrolyte. Flocculation produces fast-settling sediment and a clear supernatant. Limited data revealed the finite role of sludge plasticity on rheological characteristics. However, owing to the deterioration of the sludge network structure during settling, the purely elastic constitutive equations properly interpreted the final sediment data. The null-stress solidosity was estimated using three different methods. Polyelectrolyte flocculation renders a low attainable solidosity at the settler bottom, the low null-stress solidosity, and a less-compressible sediment. Most of the sedimentation processes considering well-flocculated slurries is governed by sedimentation compaction. The solid flux in the sediment is not a unique function of solidosity.

Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

“…where, are weighted factors associated with each set of data. When weighted factors w 1 = w 2 = w n = 1, Equation (5) reduces to Equation (6). (6) .…”

Measurement and density normalisation of acoustic attenuation and backscattering constants of arbitrary suspensions within the Rayleigh scattering regime

“…The primary advantage of ultrasound, is the improved depth penetration in concentrated and opaque media, compared with optical based methods, such as laser scattering [1], CCD video techniques [2] and optical backscatter systems [3]. In situ backscatter devices, which measure the echo response, also offer better application flexibility than instrumentation which incorporate separate transmitters and receivers, including electrical tomographic methods [4,5], gamma or x-ray densitometers [6,7], as well as ultrasonic transmission methods [8][9][10][11]. Both single-frequency and array-based echo techniques are now widely utilised to measure particle properties in relatively low-concentration environmental sediment transport studies [12][13][14][15], and similar methods are being investigated for a number of industrial fields [16][17][18][19][20][21][22].…”

In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: Application of an acoustic backscatter system

“…Alternative approaches include those analysing the transmission-attenuation response of laser light in sample based devices such as the Lumizier (from Lum GmbH) and Turbiscan (Formulation, SA) [9][10][11]; however, these ex situ systems are only suitable for small sample analysis of slowly evolving suspensions. In situ devises include light based transmission/backscatter or fluorescence devices [12][13][14][15][16][17][18], CCD video analysis [19][20][21][22][23], gamma ray [24,25] or x-ray CATSCAN [26], and also tomographic techniques which measure electrical resistance within suspensions [27,28]. However, a number of these techniques suffer from common limitations to their use, such complicated set-ups that encompass specific vessel requirements (and hence are not suitable for deployment industrially) while many are highly intrusive, or complex and expensive in application [29].…”