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Background of the study

Methods to accompany and evaluate the planning of CSO treatment concepts for complex sewer systems .

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Background of the study

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  1. Methods to accompany and evaluate the planning of CSO treatment concepts for complex sewer systems Kai Klepiszewski, Stefanie Seiffert, Mario Regneri, Emmanuel HenryPublic Research Centre Henri Tudor, Luxembourg7th International Conference on Sewer Processes & Networks, 28thAugust 2013

  2. Introduction • Background of the study • Planers & authorities confronted with comprehensive simulation results for complex combined sewer systems • Need to evaluate the performance of CSO treatment strategies • Tools to assess  volume and substance flows local treatment capabilities local emissions and to put it in a global context • The simpler the better

  3. Introduction • Development and test of three approaches • Simplified method to balance CSO emissions • Sankey diagrams to illustrate volume and substance flows • Indicator approach to analyse local loading conditions, treatmentcapabilities and emissions in a global context of a system

  4. Methodologies & Results • Sankey diagrams to illustrate volume and substance flows • Flows in network Contributing Areas represent RWF (relevant volume flows) PE represent DWF (relevant substance flows) Line width reflects percentage of local parameters to the total at WWTP • Emissions to receiving water courses Emissions of network (e.g. simulation results for CSOs)  Line width reflects local CSO volume or substance emissions to total CSO emissions of network

  5. Methodologies & Results • Sankey diagram for observed network

  6. Methodologies & Results • Indicator evaluation approach • Evaluation from the perspective of emission points (CSO structures) Set of Indicators:- Loading indicator (Acont, PE, Qoutof upstream structures)- Treatment indicator (V, Qout, treatment efficiency)- Emission indicator (CSO volume, CSO loads) Range of values of indicators: 0% - 100%  Indicators put local conditions into global context

  7. Methodologies & Results • Results of indicator evaluation

  8. Conclusions • Sankey diagram  Good overview on relevant flows in network Percentage of local emissions to total emissions of network valuable additional information • Indicator evaluation approach valuable overview of catchment and network characteristics  Reduction of CSO emissions Taking into account ocal constraints Applicable for storm water systems C related indicator for immission based approach

  9. Thank you!Merci villmols!

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