Optimising ion exchange column operation - Efficient removal of brine after regeneration

Computational fluid dynamics (CFD) was used to simulate ion exchange regeneration with brine. Brine wash out could be optimised, shortening the cycle time. Project together with Evides industriewater (Netherlands).

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Curing dead zones in lower part column

Brine removal after resin regeneration was calculated and optimised. The density of the brine solution is much higher than that of water. In the original configuration, brine severely interfered during operation after regeneration. Different geometrical adaptations were tested. The period of salt flushing out could be significantly shortened.

Major findings

Lower part of column contained dead zones
Brine washed out slowly during normal operation
The implemented geometrical improvements significantly lowered the impact of brine

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Reservoir mixing

Mixing in large drinking water reservoirs: CFD project at water-link

CFD was used to optimise mixing (remove dead zones, avoid short-circuiting) in a large drinking water storage basin for surface water, preventing blue algae blooms and stratification.

Disolved Air Flotation

CFD-based design of dissolved air flotation

Settling

Secondary settler (clarifier) design optimisation with CFD

Secondary clarifiers (or settlers) can be optimised using computational fluid dynamics (CFD). Inlet structure (energy dissipation well) and sludge removal mechanism can be designed using sludge solids and liquid modelling using density currents.

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