Conceptual Design of a 60-mgd UV Disinfection Facility

City of Syracuse, 
New York

Conceptual Design of a 60-mgd UV Disinfection Facility

Service Type: 
Project Highlights: 
  • Conceptual design of a 60-mgd UV disinfection facility.
  • Flexibility to treat and deliver water to two pressure zones.
  • Design that allows stand-alone operation or operation as part of a future water treatment facility.
Skaneateles Lake water supply
Carollo is part of a team assisting Syracuse with design of a UV disinfection facility. The facility will help Syracuse maintain the current filtration avoidance of its Skaneateles Lake water supply.

The water supply for the City of Syracuse is Skaneateles Lake, a highquality supply with low turbidity and low organics. The supply is of such high quality that Syracuse currently maintains filtration avoidance. Water flows from the lake through two intakes, enters a gatehouse where it splits into three conduits, and then exits the gatehouse where it is dosed with chlorine. The water then travels over 20 miles into open reservoirs or a standpipe to feed two pressure zones within the City. Sodium hypochlorite is added to the water as it leaves the reservoirs and standpipe and enters the distribution system. The entire system flows by gravity from the lake intake to the consumer’s tap.

To maintain filtration avoidance, Syracuse is investigating ultraviolet (UV) disinfection for the Skaneateles Lake supply. Carollo is part of the team that is providing conceptual design of a UV disinfection facility. The conceptual design consists of some unique features. Because the system flows completely by gravity, any hydraulic head used in the UV facility reduces the overall capacity of the conduits that carry water to Syracuse’s reservoirs. This required careful hydraulic design to minimize headloss through the facility. In addition, two separate pipelines carry water to two separate pressure zones within the City. To provide ultimate flexibility, each UV reactor can treat water from either of the two sources. The ultimate treatment capacity of the facility will be 60 mgd. The facility includes three reactors and an additional reactor for redundancy. Because a complete water treatment plant may eventually be located on the site, the UV facility design allows stand-alone operation or operation as part of the future water treatment facility.

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