WPC18 Technical Tours



Metro Water Services Central Wastewater Treatment Plant

Central Biosolids

Covering over 72 acres, Metro Water Services’ Central Wastewater Treatment Plant processes over 40 billion gallons of wastewater per year. This tour will highlight current treatment processes and discuss the future of this expanding wastewater facility.
Nashville’s first attempt at sewers began in 1823 utilizing brick and clay sewers constructed for both sanitary sewage and stormwater to be discharged to the Cumberland River. It was not until 1958 that Nashville constructed a centralized wastewater treatment plant to process flows from the developing city. Metro Water Services began an aggressive program of infrastructure improvements in 1990 to reduce the number of CSOs and SSOs, making tremendous progress toward improving water quality in the Cumberland River and its tributaries. Today Central WWTP has the capacity to treat 220 MGD of dry weather flow and 320 MGD during rainy weather.
Central WWTP is currently undergoing an extensive expansion to add an additional 100 MGD of treatment capacity. This tour will discuss plans for the massive multi-million dollar undertaking to optimize treatment processes and hydraulics.

Photo courtesy of Metro Water Services



Metro Water Services Omohundro Water Treatment Plant


Omohundro is a combination of impressive civil engineering and magnificently beautiful architecture. The George Reyer pumping station, when placed in service in 1889, was able to pump raw water from the Cumberland River to the residents of Nashville at a rate of 10 MGD. After several upgrades and the addition of the Robert L. Lawrence Filtration Plant in 1929, the treatment facility, now known as Omohundro, has a capacity of 90 MGD and consists of five low service pumps, seven high service pumps, two grit tanks, 22 flocculators, three sedimentation basins, and 30 filters. The chemicals used in the treatment process today consist of alum, powder activated carbon, liquid fluorosilicic acid, liquid lime, non-ionic polymer, potassium permanganate, ortho-polyphosphate, and on-site bleach generation. During this tour, you will enjoy the ageless beauty of historic architecture such as terrazzo tile floors and marble control stations alongside the latest technology such as on-site generation of bleach.

Photo courtesy of Metro Water Services




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