Alternative filter media for potable water treatment

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Need for Research

Roughing filters at London works:

  • Low backwash rates for filters at older works
  • Inability to keep sand clean (rising normalised starting head loss)
  • Vulnerability to algal laden water
  • Loss of production at critical times during the year
  • Objective: identify mono-medium & dual media alternatives to
    • BSS 14/25 sand
    • BSS 14/25 sand / grade 2 coarse anthracite
  • Which demonstrate hydraulic advantage & produce acceptable filtrate quality

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