Optimization of semi- and decentralized rainwater treatment for elimination of AFS63, Cu, Zn and PSM by mathematical modelling

Precipitation runoff from surfaces can contain a wide range of pollutants. Dirty precipitation water must therefore be treated in the separation system during drainage. The separation decree "Anforderungen an die Niederschlagsentwässerung im Trennverfahren " (2004, MULNV) specifies the implementation of rainwater treatment. Semi-central and decentralised treatment methods are preferable to centralised methods (rain clarifiers), if their comparability to centralised systems can be proven.

In semi-centralised and decentralised systems, several treatment stages are often used. In addition to the separation of particles by physical-mechanical processes (sedimentation and filtration), dissolved heavy metals are retained by chemical-physical processes (adsorption on filter material).

This project deals with the optimisation of semi- and decentralized plants for precipitation water treatment. With the help of computational fluid dynamics and mathematical modelling, insights for the improvement of the plants with regard to the sedimentation behaviour of particles and the filter retention will be gained.