Customer: GU Partnerships, UK

Product/Service: Design Consultancy

Problem: Operational problems with pulsator clarifiers at Iver WTW resulted in unstable sludge blankets and solids carry-over, and led to increased chemical expenditure.

Objectives: To look at the flow patterns and mixing regimes within the clarifier drop-shaft and outlet pipe using CFD, to investigate these phenomena and improve hydraulic conditions.

Approach: Following a site review of hydraulic factors influencing clarifier performance, the drop shaft was modelled using CFD. Data from the study revealed short-circuiting and recirculation phenomena in the existing design. Modifications and remodelling of the drop shaft and outlet pipe were undertaken using CFD.

Outcome/Benefits: The modifications reduced short-circuiting , increased the contact time for coagulant blending and flocculation and produced a better mixture qualitiy. The overall improvement in clarifier performance produced significant savings in chemicals.

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