1 / 13

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.

quang
Download Presentation

Annelies Aarts Jeroen Langeveld Marie-Claire ten Veldhuis Luuk Rietveld

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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?

More Related