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Treatment Systems at WPCF

The Norwalk WPCF involves the following processes prior to discharging clean water into the Norwalk River:

  • Headworks/Preliminary Treatment (Mechanical Bar Screens, Main Lift Station, Aerated Grit Chambers);
  • Primary Treatment (Primary Clarifiers);
  • Secondary Treatment (Aeration tanks, Final Clarifiers, Secondary Lift Station);
  • Disinfection (Chlorination and Dechlorination);
  • Supplemental Treatment (Wet Weather)

The Norwalk WPCF also handles the solid waste generated during the wastewater treatment process. The final product in the biosolids treatment process is liquid sludge and dewatered cake which are removed to offsite locations for further treatment and disposal. The solids handling processes includes:

  • Primary Sludge Thickening using Gravity Thickener Tanks;
  • Waste Activated Sludge (WAS) Thickening using Gravity Belt Thickeners;
  • Primary and Thickened WAS Blending Tank and Storage;
  • Sludge Dewatering using Centrifuges