The Town of Thompson’s Station (the Town) provides wastewater collection and treatment services for a portion of its residents. As part of this service, the Town operates the Regional Wastewater Treatment Plant (WWTP). The Regional WWTP, located at 4549 Columbia Pike, provides wastewater treatment for the majority of the Town’s system. The plant was constructed in 2005 and currently treats an average of 375,000 gallons per day (GPD). The current system is composed of two wastewater lagoon ponds that provide biological breakdown of domestic wastewater during the detention time within the basin. Once the water has had sufficient reaction time, wastewater is filtered and then disinfected with ultraviolet light.
To accommodate future growth, development, and increased flows, the town is designing a plant expansion at the Regional WWTP. The new facility will convert the existing system from a lagoon system to membrane technology and provide a higher level of treatment for future potential changes in effluent disposal permit limits. Membrane technology provides superior treatment and dramatically decreases the footprint of the treatment plant area. By decreasing the footprint and increasing the treatment capacity, the town is able to provide a more sustainable system for the future.
The proposed improvements generally include the following:
- Upgraded influent pumps
- New headworks screens
- New aeration basins
- Membrane bioreactor (MBR) treatment
- Ultra-violet disinfection
- Solids digestion and dewatering
- Standby generator
The new permitted treatment capacity will be initially increased from the current 470,000 gallons per day (gpd) to 1,000,000 gpd. A location map for the existing Regional WWTP site and the proposed location of the upgrades is shown below.
Regional Plant Upgrades Layout
Estimated Construction Schedule
