2-3_3. tok

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2-3_3. tok

  1. 1. Jaroslav Pollert Czech Technical University in Prague Faculty of Civil EngineeringDepartment of Sanitary and Ecological Engineering
  2. 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. 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. 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. 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. 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. 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. 8. TOK Moravský Krumlov Easy installation  2 pieces prepared in factory 2 manholes Scumboard x cofferdam Temporary outflow
  9. 9. Scumboard x cofferdamFrom scumboard you can easily create cofferdamOn the right side temporary outflow
  10. 10. Mathematical model TOK Děčín•Simulation of separationefficiencies in TOK Děčín(path lines of particles d=150μm, ρ=1800 kg/m3)
  11. 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. 12. Comparison with conventional types
  13. 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. 14
  15. 15. Overall results cinf low − coverflow η= ⋅100% cinf low
  16. 16. Comparison with conventionaltypes
  17. 17. TOK Děčín •Inflow DN 1000 High traffic street Overnight instalation

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