Net Zero Water Treatment Facility at Largo

April 24th, 2014


Net Zero Water Treatment Facility

Near the Largo Town Center Metrorail Station, Metro is constructing a water treatment facility that features a modular green roof system and rain garden to filter stormwater. The facility will manage subsurface water from the track bed and has been designed with photovoltaic panels and battery storage system to achieve net zero energy specifications. Designing the facility to net zero means the building will produce as much energy as it needs on-site, without drawing power from the electric grid, to perform the entire subsurface water treatment process.

Currently, in accordance with State of Maryland requirements, track bed water at the station is treated to balance acidity and sulfate solids prior to being discharged into the storm sewer system. New regulations require Metro to undertake more comprehensive stormwater treatment to remove also remove iron and suspended solids. Initially, expanding the current underground water treatment facility at the site was considered. However, the existing location did not have sufficient space to allow the new requirements to be met and a new treatment facility was necessary. The new treatment facility will utilize three large submersible pumps to transport the stormwater to the surface for treatment. Pumping the water to the surface presented new process load requirements, but to address these the facility has been designed with a gravity feed system that uses less energy over the life of the project to perform the water treatment process. In addition, the facility also showcases a host of operating cost reducing green building technologies, including:

  • Photovoltaic panels with a battery storage system to provide sufficient power to manage the entire water treatment process
  • A modular green roof system to filter for precipitation and reduce stormwater run off
  • Building automation controls to monitor and manage building processes
  • An on-site rain garden to manage surface storm water from the parking  lot

This project provides a successful example of Metro’s ability to be a leader in the development of facilities that support regional sustainability efforts while remaining efficient, resilient, and effective.

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