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Low cost method for determining occurrence and duration of combined sewer overflows

Low cost method for determining occurrence and duration of combined sewer overflows A. Montserrat , O. Gutierrez, M. Poch , Ll. Corominas. 7th International Conference on Sewer Processes and Networks (28-30 Sep 2013). Table of contents. INTRODUCTION THE METHOD CASE-STUDY RESULTS

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Low cost method for determining occurrence and duration of combined sewer overflows

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  1. Low cost method for determining occurrence and duration of combined sewer overflows A. Montserrat, O. Gutierrez, M. Poch, Ll. Corominas 7th International Conference on Sewer Processes and Networks (28-30 Sep 2013)

  2. Table of contents • INTRODUCTION • THE METHOD • CASE-STUDY • RESULTS • CONCLUSIONS

  3. PROBLEM STATEMENT • Combined sewer overflows (CSO) are a threat for the environment EPA

  4. CSO legal framework • UWWTD (1991) – Dotnot precise control measures • WFD (2000) – Requiresgoodqualityforwaters • Updating of UWWTD transpositionstoaccountforCSOs(e.g. Real Decreto 1290/2012) MONITORING

  5. Reviewed CSO monitoringmethods Visual inspections Conductivity meter Waterquality sensor Level sensor Flowmeter

  6. Reviewed CSO monitoringmethods MAIN DRAWBACK: TOO EXPENSIVE TO MONITOR THE ENTIRE CSO NETWORK

  7. THE METHOD Principle: temperaturedifferencesbetweenthesewer gas phase and the CSO

  8. Materials & installationsetup Tº sensor Waterproofcasing 45€ per unit Optic data reader Waterproofcasing 240€ 3-minutes frequency logging interval -> 120 days storing data

  9. Materials & installationsetup

  10. Case-study La Garriga village (16.000 inhabitants) Barcelona Besòsriverbasin

  11. Case-study La Garriga CSS 370Ha drainage area 7.3 km long pipes Ø 300-800mm 13 weirs studied: - 6 transverse w. - 7 side-flow w. Flowdirection

  12. Case-study La Garriga CSS 370Ha drainage area 7.3 km long pipes Ø 300-800mm 13 weirs studied: - 6 transverse w. - 7 side-flow w. Flowdirection TOTAL MATERIAL INVESTMENT 924€

  13. Methodvalidationforone single weir

  14. Methodvalidationforone single weir 1h CSO

  15. Types of temperature responses 3 categories of temperature response weredefined

  16. Methodeffectivenessassessmentfortheentire CSO network EP = (Category 1 responses + Category 2 responses) / (Category 1,2,3 responses) * 100 For 1 yearperiod, 57 rainfallepisodes, 13 weirs: 723 responses

  17. Methodeffectivenessassessmentfortheentire CSO network For 1 yearperiod, 57 rainfallepisodes, 13 weirs: 723 responses

  18. Methodeffectivenessassessmentfortheentire CSO network Loweffectivenesscloselyrelatedtothecharacteristics of theweir CSO13 EP: 49% CSO11 EP: 54% CSO9 EP: 40% Stuckwater in thestructure High turbulence in thesewer pipe Sensor in contactwiththewater in dryconditions

  19. Characterization of the La Garriga CSS Lookingforthecriticalweirs

  20. Conclusions • A low-costmethodtoquantifyoccurrence and duration of CSOswasdeveloped • Themethodwasvalidated, and higheffectivenessobtained in most cases • Theeffectivenesswasaffectedbysomephysicalcharacteristics of theweir • Highlyvaluable data wasobtainedwith a minimalinvestment of 924€ • Themethodofferspotentialapplications Science of the Total Environment 463–464 (2013) 904 – 912

  21. Acknowledgements ENDERUS (CTM2009-13018) Juan de la Cierva (jci-2009-05604) EcoMaWat(MC-CIG CareerIntegrationGrants, ref 293535) FPI (BES-2010-039247)

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