Drinking water pellet softening

Drinking water pellet softening: prediction the terminal settling velocity of natural particles

Kramer, O.J.I. (TU Delft Sanitary Engineering; Waternet; Hogeschool Utrecht)
de Moel, P.J. (TU Delft Sanitary Engineering; Waternet; Omnisys)
Baars, E.T. (Waternet)
van Vugt, W.H. (Hogeschool Utrecht)
van der Hoek, J.P. (TU Delft Sanitary Engineering; Waternet)

2017

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.

drinking water
terminal settling velocity
calcium carbonate pellets
pellet softening
garnet sand
grained calcite seeding material
drag coefficient

http://resolver.tudelft.nl/uuid:9381dbcd-b77a-4f07-aa81-df65514c0c74

5th IWA Young Water Professionals BeNeLux conference: Ghent, Belgium

5th IWA Young Water Professionals BeNeLux conference, 2017-07-05 → 2017-07-07, Ghent, Belgium

Institutional Repository

conference paper

© 2017 O.J.I. Kramer, P.J. de Moel, E.T. Baars, W.H. van Vugt, J.P. van der Hoek