Water Treatment

A division or service unit of the Public Utilities Department

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The treatment process used at the new Dempsey E. Benton Water Treatment Plant begins with adding ozone to the raw water and ends with ultraviolet (UV) disinfection and chloramination.

Suspended solids are coagulated with ferric sulfate, settled in a solids contact clarifier, and gravity fed through a two-stage filtration system.

The filtered water is then disinfected with both ultraviolet light and chloramines before it is stored in a five million gallon on-site storage reservoir. From the storage reservoir, water is pumped directly to customers in Raleigh and Garner.





Wastewater Treatment Process

Advanced or tertiary treatment means that wastewater undergoes three stages of treatment: primary, secondary and advanced treatment.

  1. Primary treatment is a physical process removing debris, sand, heavy organic solids, and grease and oils.
  2. Secondary treatment is a biological process referred to as "activated sludge" in which microorganisms convert ammonia-nitrogen to nitrogen gas through the process of nitrification/denitrification. Secondary clarification separates the microorganisms from the treated water and returns them to the biological process.
  3. Advanced treatment is the process of filtering the clarified water in sand filters and disinfecting the water by ultraviolet (UV) light before the water is metered and returned to the Neuse River.

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