Vortex combined sewer overtlow (CSO) structures with a peripheral spill weir are sometimes used within UK sewerage systems for the prevention of tlooding and the retention of pollutants within the sewer system.

The velocity distribution within such a CSO chamber has been simulated using the 3D mathematical model FLUENT. Similarly the particle tracking routine of FLUENT has been utilised to predict the trajectory and final destination (treatment or spill) of individual particles with known size and terminal velocity which were introduced within the intlow to the chamber. From this data it has been possible to predict the solids separation retention efficiency for these particles and the results have been compared with previously published experimental data. Some agreement was observed between the two sets of results.

The paper is concluded by a discussion concerning the capability and limitations of the FLUENT model to predict the hydraulic and pollutant retention performance of a Vortex CSO chamber.

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