Combination of computational techniques -: evaluation of CSO efficiency for suspended solids separation

During the last two decades, the use of simulation models has played an increasingly important role in the evaluation of the dynamic behaviour of sewer systems. One of the basic characteristics of these models is the number of dimensions taken into account during simulation. This paper demonstrates the benefits of the combination of two models with a different number of dimensions included. The evaluation of separation efficiency of suspended solids in the combined sewer overflow (CSO) was the basic objective of the project. Two simulation models have been used for the evaluation. The 1 D model output was the CSO inflow hydrograph, which was used as an input for the 3D model. With the help of the 3D model, the water flow inside the CSO was simulated. This paper includes the results of case study documenting the proposed methodology. Charts of concentration dynamics of suspended solids on the CSO inflow, outflow and overflow are presented (for particles with different characteristics).