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2-3_3. tok

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  • 1. Jaroslav Pollert Czech Technical University in Prague Faculty of Civil EngineeringDepartment of Sanitary and Ecological Engineering
  • 2. OutlineEcological and economical motivationDevelopment  Design description and operational principle  Mathematical and physical modellingInstallation  First specimens  Comparison with conventional typesConclusion and future
  • 3. CSO - motivation Collaboration with HOBAS company Using their production Environmental pollution from CSO Decreasing of suspended solids load European Water Framework directive 2000/60/EC Easy installation and operation
  • 4. DevelopmentDevelopment in CTU  Physical model  Mathematical modelMain aim of the development:  Simple construction  Cheap production  Easy installation  Decrease pollution load to environment  Easy operation  Trouble free and safe operation
  • 5. TOK – Tube Combined Sewer Overflow 1200Inflow part leads to 20 R1 0 accumulation chamber 600 600 100 R1 0Scumboard protect overflow against flotables which are 100 1200 R1 0 stored in accumulation chamer 600 600 R1 0Shape of the overflow slit were under development 200 1200 R1 0 200
  • 6. Developing TOK– mathematical and physical model  Overflow slit  Shape development for decreasing suspended solids overflow  Contraction of the slit on the end of CSO decrease turbulences  Comparison of mathematical model and physical model
  • 7. Mathematical model 1200 1200 R10 R10 20 20slit Normal shape, scumboard, not too Normal shape, no scumboard, not too linear pathlines linear pathlines 1200 R10 20 0slit 20 0 R10 1200 Open shape on the end, scumboard, Open shape on the begining, high turbulences on the end scumboard, linear pathlines
  • 8. TOK Moravský Krumlov Easy installation  2 pieces prepared in factory 2 manholes Scumboard x cofferdam Temporary outflow
  • 9. Scumboard x cofferdamFrom scumboard you can easily create cofferdamOn the right side temporary outflow
  • 10. Mathematical model TOK Děčín•Simulation of separationefficiencies in TOK Děčín(path lines of particles d=150μm, ρ=1800 kg/m3)
  • 11. ResultsTOK Děčín measuring x mathematical modelMathematical model Separation efficiency % d Density Sedimentation 2xQcrit 5xQcrit 7.5xQcrit velocity [m] [kg/m3] [m/hod]Fraction1 50,0% 1,00E-06 1300 0,00049 30% 6% 2%Fraction2 25,0% 1,00E-05 1800 0,131 46% 11% 4%Fraction3 22,5% 1,00E-04 2600 23,77 78% 33% 18%Fraction4 2,5% 1,00E-03 2600 593,19 100% 100% 100%Overall efficiency 46,55% 15,68% 8,55%
  • 12. Comparison with conventional types
  • 13. Conclusion and futureDevelopment of new CSO Main aims were achieved Mathematical model and physical model were compared Shape of the overflow slit were developedSeveral TOKs were installed and more are planned Moravský Krumlov, Děčín, Teplice …Future – further development and improvement
  • 14. 14
  • 15. Overall results cinf low − coverflow η= ⋅100% cinf low
  • 16. Comparison with conventionaltypes
  • 17. TOK Děčín •Inflow DN 1000 High traffic street Overnight instalation