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Particle-visualisation - a tool for determination of rise velocities

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Author

Summary, in English

Particles from post denitrifying Kaldnes Moving Bed(TM) Process were studied using an optical borescope, a visualisation technique that provides opportunities for both qualitative and quantitative studies of the separation mechanism in Dissolved Air Flotation (DAF). Rise rates for particle/bubble aggregates were estimated showing great variability. Two groups of aggregates were distinguished; relatively small floes (<100 mum) with single bubble's attached rising comparatively slowly and large flocs (>100 mum) with several bubbles attached rising very fast. The high rise rates for large aggregates are discussed, possibly explained and suggested as the reason for the effective separation of large particles noticed in previous studies. Removal efficiency of different size categories of particles in DAF were investigated on the basis of particle size analysis indicating increased separation efficiency with increasing particle size.

Publishing year

2004

Language

English

Pages

229-236

Publication/Series

Water Science and Technology

Volume

50

Issue

12

Document type

Journal article

Publisher

IWA Publishing

Topic

  • Water Engineering

Keywords

  • visualisation
  • particle
  • particle size analysis
  • DAF
  • particle separation
  • rise velocity

Status

Published

ISBN/ISSN/Other

  • ISSN: 0273-1223