Date
Tuesday, September 10, 2024
Time
2:30 PM - 3:00 PM
Location Name
M100
Name
Phase 1 Removing the Risk- Replacing one of the Oldest and Most Historic Pump Stations in the Nation
Track
Other/Special Topics
Description

The City of Nashville is supplied with drinking water by two water treatment plants, Omohundro Water Treatment Plant (OMO WTP) and K. R. Harrington Water Treatment Plant . To meet current demands in the system both treatment plants must remain operational 24 hours per day / 7 days per week. Growth and drinking water demand projections indicate that the current treatment plants will not meet the future needs of Nashville. To meet the future demands, expansion of the plants will begin at the OMO WTP and will be expanded from 90 MGD to 150 MGD. As one of the oldest water treatment plants in the nation, the OMO WTP consists of the George Reyer Pumping Station (GRPS) and the R. L. Lawrence Water Treatment Plant. The GRPS was constructed in 1888 - 1889 to upgrade the city’s fire protection and drinking water system, suppling additional water from the Cumberland River to the City of Nashville. The R. L. Lawrence Water Treatment Plant was constructed in 1927 - 1929 on the OMO WTP site to provide 28 mgd of filtered drinking water using conventional water treatment. The pumping and treatment capacity of the OMO WTP has increased to 90 mgd through improvements over the 135 years of operation. The OMO WTP is listed on the National Historic Register. To reduce risk due to the age of the existing pumping systems, the first phase of the process improvements includes both raw water and finished water pumping facility improvements. The team initially reviewed the options to retrofit the existing GRPS, but this was eliminated because of concerns of keeping the existing pumping systems operational during construction. The option for a new pumping station (RFWPS) was selected for replacement of GRPS. The new RFWPS will include raw water and finished water pumping systems combined in a single building. Numerous concepts and layouts were reviewed for this combined pumping systems. The selected alternative for advancement was vertical turbine pumps in wet wells for raw water and “canned” vertical turbine for finished water to provide a cost effective, maintenance friendly facility. The existing river intakes and one new river intake will be utilized for raw water flow to the new pumping station. Flow meters will pace chemical dosing of Sodium Permanganate and Powered Activated Carbon. The chemical storge and feed systems will be part of the new RFWPS. The RFWPS will include (6) vertical turbine pumps in cans for finished water pumping. The pumps will be supplied with flow meters to allow accurate determination of flows to Nashville and connections to the distribution system will be supplied with flow meters to allow better definition of flows in the distribution system. Water treatment plant backwash water will be metered and recycled to the RFWPS for reuse. A phased approach will be utilized to bringing the RFWPS online to meet current operations and future operations. Architectural renderings included will show how to conform to the State Historic Preservation requirements for the OMO WTP Historic Campus.