Concentration profiling of a horizontal sedimentation tank utilising a bespoke acoustic backscatter array and CFD simulations

Timothy N. Hunter*, Jeff Peakall, Darrell Egarr, David M.J. Cowell, Steven Freear, Alastair S. Tonge, Lucy Horton, Hugh P. Rice, Iain Smith, Kevin Malone, David Burt, Martyn Barnes, Geoff Randall, Simon Biggs, Michael Fairweather

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

2 Citations (Scopus)

Abstract

The performance of a pilot-scale horizontal sedimentation tank was characterised utilising computational fluid dynamics (CFD) and a bespoke ultrasonic backscatter array, for both spherical glass and flocculated calcite separation. The CFD simulation was developed in OpenFOAM, using algebraic slip and hindered settling models, in order to solve the transport of multiple particle size classes, enabled through a population balance approach. Simulations of concentration compared closely to samples for the glass dispersions, but under-predicted concentration with flocculated calcite (likely due to complexities from modelling floc break-up in the mixer). In comparison, the acoustic array measured the calcite concentration with a high degree of resolution, where in particular, evidence suspension mobilisation near the outlet was observed, due to recirculation. Overall, we demonstrate the performance and current limitations of large-scale CFD for complex floc systems, as well as the use of ultrasonics to significantly aid process understanding, through online monitoring of solid-liquid separations.

Original languageEnglish
Article number115560
JournalChemical Engineering Science
Volume218
Early online date10 Feb 2020
DOIs
Publication statusPublished - 8 Jun 2020

Keywords

  • Acoustic backscatter systems
  • CFD
  • Clarifier
  • Flocculation
  • Horizontal sedimentation
  • Ultrasonics

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    Hunter, T. N., Peakall, J., Egarr, D., Cowell, D. M. J., Freear, S., Tonge, A. S., Horton, L., Rice, H. P., Smith, I., Malone, K., Burt, D., Barnes, M., Randall, G., Biggs, S., & Fairweather, M. (2020). Concentration profiling of a horizontal sedimentation tank utilising a bespoke acoustic backscatter array and CFD simulations. Chemical Engineering Science, 218, [115560]. https://doi.org/10.1016/j.ces.2020.115560