Monday, March 8, 2021
“Scenic City Says Sayonara to Chlorine Gas”
Tennessee American Water Company’s Citico WTP Conversion to Liquid Sodium Hypochlorite
Tyler Cross, P.E., Tennessee American Water Company
Justin Bolender, P.E., HDR Engineering, Inc.
Tennessee American Water Company (TAWC) owns and operates the Citico Water Treatment Plant (WTP) on the south bank of the Tennessee River in Chattanooga, Tennessee. This plant is the largest source of potable water supply in the metropolitan Chattanooga area. The plant previously used chlorine gas as a pre-treatment chemical and post-treatment disinfection agent at the plant. This presentation will highlight the planning, design and construction of TAWC’s conversion to disinfection with bulk storage liquid sodium hypochlorite. As this project was put into service in late 2019, the discussion will not only speak from the experience of the design and construction phases, but also provide lessons learned based on operation of the facility for over a year.
The new disinfection facility includes four 10,000-gallon liquid sodium hypochlorite tanks which allows a 15-day supply for disinfection of the pre-treatment chemical and post-treatment disinfection for the 65 MGD WTP. The new building includes a storage tank room with secondary containment, separate chemical feed pump and electrical rooms, heating, ventilation, fire protection and security components. The roof of the building is designed such that the Fiberglass Reinforced Plastic (FRP) tanks can be replaced in the future by lifting the tanks through removable skylight openings. The chemical feed system includes nine separate peristaltic pumps with independent piping systems to feed each chemical feed point.
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