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Egham Water Treatment Works - PowerPoint PPT Presentation


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Egham Water Treatment Works. Flow: 2920 m 3 /h. Source. Thames River. Screening. With surface boom. Rotating Mesh Screen. Debris from Screens. Pre-ozone in-line injector. Purpose: to help with coagulation They also add pre chlorine to breakpoint any ammonia needed ~80% of time?.

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Presentation Transcript
source
Source
  • Thames River
screening
Screening
  • With surface boom
pre ozone in line injector
Pre-ozone in-line injector
  • Purpose: to help with coagulation
  • They also add pre chlorine to breakpoint any ammonia
    • needed ~80% of time?
pre o3 injector and static mixer
4 elements

700 mm diameter

196 mbar headloss

97% transfer efficiency

Pre-O3 injector and static mixer
gravity settling tanks
Gravity Settling Tanks
  • Sludge blanket
  • submerged conical sludge collectors
    • can be barely seen here
    • suspended from above
dual media rapid filters
Dual Media rapid filters
  • Anthracite & Sand
  • siphons (good practice)
lox handling
LOX handling
  • Heat transfer
ozone generator
Ozone Generator
  • Trailigaz
  • One of 3 units
    • only one in use that day
ozone generator19
Ozone Generator
  • No blue glow, because of pure O2
intermediate o3 monitor
Intermediate O3 Monitor
  • Purpose of inter ozone: disinfection
  • criteria: 0.4 mg/L residual after 4 minutes in contact tank
gac contactors
GAC contactors
  • Modular design
  • Avoided need for expensive in place concrete
    • problems with leaks
final disinfection
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