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Clarifier group inlet channelMany types of clarifiers are found in water and wastewater treatment plants and their primary function is to provide a "plug flow" that encourages the settlement of suspended particulate matter into a sludge blanket.

Sometimes the design of inlet channels that carry flow to clarifiers produce imbalances (right).  In these situtations, CFD can be used to identify reasons for the flow imbalance and to develop cost effective corrective actions. 

CFD can also be used to model fluid flow and the simultaneous settlement of solids.  This allows us to assess the performance of secondary (final) clarifiers.  The results below show the 3D form of a sludge blanket that has migrated across the hopper that is used to withdraw settled sludge.  The “launders” through which the clarified water flows are shown at the bottom right of the graphic.

Large format rectangular clarifier with sludge blanket

CFD simulations allow us to identify important flow features and to determine the ability of design changes to improve the performance of clarifiers in advance of fieldwork or remediation proposals.

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