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Annelies Aarts Jeroen Langeveld Marie-Claire ten Veldhuis Luuk Rietveld

Combined sewer overflows in urban areas – interpreting and comparing European CSO monitoring results. Annelies Aarts Jeroen Langeveld Marie-Claire ten Veldhuis Luuk Rietveld. Research questions.

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Annelies Aarts Jeroen Langeveld Marie-Claire ten Veldhuis Luuk Rietveld

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  1. Combined sewer overflows in urban areas – interpreting and comparing European CSO monitoring results Annelies Aarts Jeroen Langeveld Marie-Claire ten Veldhuis Luuk Rietveld

  2. Research questions • Is it necessary to collect local data toestimate the Event MeanConcentrations from Combined Sewer Overflow pollutants? • Which location specific properties cause differences in EMC between CSO locations?

  3. The database • Event Mean Concentrations from literature search • Individual CSO events • European locations • Information about the CSO location available • The final database contained 278 CSO events measured at 24 catchments in 8 countries

  4. The database

  5. The database

  6. Analysis • Kruskal Wallis (non-parametric equivalent of ANOVA) to compare medians • Spearman rank correlations (no assumption of linear relationships) to study the correlations between the pollutant EMC and the location specific properties

  7. Results

  8. Results Kruskal Wallis test • EMC of TSS, COD, BOD, total-N, total-P, Cd, Pb and Zn is significantly different in at least one location • EMC of NH4+ is NOT significant different between the locations • (insufficient data from the other pollutants)

  9. Results Correlation matrix: location properties and EMC

  10. Results Correlation matrix: rain event properties and EMC

  11. Results Correlation matrix: location and rain properties!

  12. Conclusion • There is a significant difference of the pollutant EMC between locations but not for NH4+ • Weak correlations between EMC and the location specific properties was identified • Stronger correlations were observed between EMC and PDWD, rain duration and max rain intensity • Correlation with not included sewer and land/area characteristics is possible but couldn’t be verified

  13. Continuation… • This CSO databasecould (should) be • the start of CSO data sharing between city’s, countries • a direct source of information for sewer, CSO treatment designers • a reference for future CSO monitoring campaigns • a source of calibration data for wet sewage models • other? • Would you like to add/share your own CSO data?

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