Project Examples

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Meeting effluent standards at lowest possible cost (750,000 p.e. plant) Wastewater

Quantifying inhomogeneous mixing and biokinetics

Liquid and gas flow rates have a vast impact on tank performance and local oxygen and ammonia concentrations. We tested different scenarios to optimise plant performance both in terms of performance and cost. Currently we are looking at optimal sensor location to better control the plant.

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Improving flow patterns in a large drinking water reservoir Drinking water

Making retrofit decisions

Non-uniform discharge, dead zones and partly long residence time cause deterioration of the water quality. Relocation of the outlet structure could improve the general flow behaviour in the reservoir

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Design of a crystalliser Wastewater

Optimal impeller speed and baffle design

We tested 4 design scenarios before the reactor was constructed. Both the optimal baffle configuration and impeller speed were determined using CFD.

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Increasing accuracy of in-line suspension monitoring Pharma manufacturing

In-line NIR measurement channel

An optimal CFD-based design avoided turbulence in the pipe and increased sensor accuracy

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Improving aeration and ammonia profile Wastewater

Quantifying inhomogeneous mixing and biokinetics

We combined CFD with biokinetics and showed that surface aerators due to their design limitation have a significant impact on ammonium removal. Ammonium concentrations tended to accumulate at the bottom due to less dissolved oxygen concentrations.

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Optimising ion exchange column operation Drinking water

Efficient removal of brine after regeneration

CFD was used to visualize dead zones in the lower part of an ion exchange column. Different optimisation strategies were tested.

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Improved effluent predictions (secondary settler) Wastewater

Accounting for discrete settling

A flocculation model was combined with CFD. Outcomes could be used for settler design.

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Quantifying nitrous oxide emissions in wastewater treatment plants Wastewater

Impact of hydrodynamics on biokinetics

Greenhouse gas emissions from wastewater treatment plants (WWTPs) are a growing concern. Production of the strong greenhouse gas nitrous oxide (N2O) in WWTPs strongly depends on local oxygen concentrations in the large bioreactors. Only by accounting for hydrodynamics, accurate predictions of N2O emission can be obtained.

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