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Sand filter design and standardisation using CFD

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Sand filtrationDesign

Our customer the Dutch drinking water company Vitens wants to standardise the design of it's rapid sand filters. Many design types exist (circular, rectangular, with different dimensions). Using a very realistic CFD model, we assessed:

  • The filtration cycle: is loading over the bed equally distributed?
  • The backwash cycle: can we shorten or optimise the backwash?

Methodology

We applied a 3-phase CFD model that very realistically modelled different full-scale sand fitlers in 3D.

Outcomes

The placement of inlet/outlet gutters, nozzles, filter dimensions, filter aspect ratio's, water levels, .... were assessed. We could propose optimal inlet configurations that led to a more homogeneous distribution (and loading) over the filter.

We also proposed improvements for the bottom part of the filter (nozzles and space under the filter).

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