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Key outcomes:

  • Optimal additive location identified
  • Well mixed solution achieved

Figure 1: Water passing over a high weir generates a complex, turbulent flow field

In the water treatment industry, managing of metrics such as pH, additive concentration and micro-scale organisms is essential for assuring quality control over secondary treatment processes. For facilities that process contaminated waste water, properly controlled treatment is essential for achieving hygiene, safety and environmental goals. Properly mixing the water after dosing is critical both to the achieve a uniform effect and to permit accurate measurement. For this research Synergetics engineers used computer modelling to determine how many weirs were required to achieve a well mixed fluid after dosing a treatment solution into a waste water flow.

Achieving better understanding of systems like this allows for better mixing processes with minimised footprint and optimally located inlets/sampling stations. For the geometry modelled in this case study it was determined that at least three weirs were necessary to achieve adequate mixing.
CFD modelled concentration in a water stream, after a contaminated parcel of water passed over a weir.

Figure 2: Concentration of additive after a single pass over the weir. A moderate level of mixing has occurred, but the concentration is far from uniform.


For more examples of water and mixing modelling see our sector page.