Drinking water pellet softening

prediction the terminal settling velocity of natural particles

Conference paper (2017)

Authors

O.J.I. Kramer Sanitary Engineering - CEG , Waternet, Hogeschool Utrecht
P.J. de Moel Waternet, Sanitary Engineering - CEG , Omnisys
E.T. Baars Waternet
W.H. van Vugt Hogeschool Utrecht
J.P. van der Hoek Sanitary Engineering - CEG , Waternet
Research Group
Sanitary Engineering (CEG) (TU Delft)
Copyright: © 2017 O.J.I. Kramer, P.J. de Moel, E.T. Baars, W.H. van Vugt, J.P. van der Hoek
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Published Date

2017

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Water Management

Research Group

Sanitary Engineering

Abstract

Natural particles are frequently applied in drinking water treatment in up-flow fluidisation processes. Additionally, sedimentation processes are applied to clarify water and to concentrate solids. To estimate the terminal settling velocity of single solid particles in a liquid system, a comprehensive collection of equations is available. For perfectly round spheres, settling velocity can be calculated accurately. For naturally imperfect particles, however, experimentally measured settling velocity shows considerable deviation compared to calculated values. This article discusses a number of experiments demonstrating this deviation and the applicability of commonly used drag-coefficient equation by Brown-Lawler.