Egham Water Treatment Works - PowerPoint PPT Presentation

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Egham Water Treatment Works

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  1. Egham Water Treatment Works Flow: 2920 m3/h

  2. Source • Thames River

  3. Screening • With surface boom

  4. Rotating Mesh Screen

  5. Debris from Screens

  6. Pre-ozone in-line injector • Purpose: to help with coagulation • They also add pre chlorine to breakpoint any ammonia • needed ~80% of time?

  7. 4 elements 700 mm diameter 196 mbar headloss 97% transfer efficiency Pre-O3 injector and static mixer

  8. Gravity Settling Tanks • Sludge blanket • submerged conical sludge collectors • can be barely seen here • suspended from above

  9. Nigel describing sludge cones to class

  10. Dual Media rapid filters • Anthracite & Sand • siphons (good practice)

  11. Intermediate Ozone Building

  12. Liquid Oxygen Tank

  13. Liquid oxygen equipment

  14. LOX handling • Heat transfer

  15. Ozone Generator • Trailigaz • One of 3 units • only one in use that day

  16. Ozone Generator • No blue glow, because of pure O2

  17. Intermediate O3 Monitor • Purpose of inter ozone: disinfection • criteria: 0.4 mg/L residual after 4 minutes in contact tank

  18. GAC contactors • Modular design • Avoided need for expensive in place concrete • problems with leaks

  19. Final Disinfection • Free chlorine • shoot for a residual of about 0.5 mg/L • requires a dose of ~ 2-3 mg/L • Addition of sulfur dioxide • to achieve target FRC • THMs are low (~30 ug/L) • except when prechlorinating • final pH is about 7

  20. Sludge Centrifuge