Metro Finds New Ways to Save the Bay

December 17th, 2014 Leave a comment Go to comments

Largo Stormwater Treatment Facility

Largo Stormwater Treatment Facility

Metro’s new Largo stormwater facility is making progress towards the Authority’s sustainability goals including reduced water and energy use, carbon emissions, and operating costs.

On November 13, Metro hosted a tour of its high-efficiency stormwater treatment facility at Largo. Highlighted during its design phase in a previous post on Metro’s Sustainability Agenda. The facility is now fully functional – with a green roof and solar panels that create enough energy to run the plant round the clock. “With a truly innovative design, this facility provides a green and cost effective model for organizations in the region as they make investments in similar facilities” according to Metro’s sustainability manager, Rachel Healy. The open house provided an opportunity for interested regional stakeholders to tour all of the facilities uniquely practical design in operation. Representatives from the Metropolitan Washington Council of Governments, Maryland Department of the Environment, Environmental Protection Agency, and Prince George’s County Council were in attendance.

Designed to ensure Metro meets stricter new discharge permit requirements that form part of the Chesapeake Bay Preservation Act, the facility pumps an estimated 27,000 gallons of water per day from Metrorail tunnels near the Largo Town Center Station. The new state of the art facility houses a unique combination of features designed to reduce energy consumption and continue Metro’s commitment to invest in sustainability and reduce operating costs.

Instead of using more traditional heavy duty water pumps that have a high energy consumption and operating cost, the new Largo facility features a combination of gravity-fed treatment tanks and a high-efficiency mixing system that uses bubbles of compressed air to “circulate” the water. On the roof, solar panels supply extra electricity back to grid during the day and the building only draws grid power at night or during extended periods of low sunlight.  Metro will prevent an estimated 3 tons of C02 emissions per year through solar energy generation alone. This is the equivalent of half the emissions from an average homes electric use over the same period.

The Largo treatment facility showcases the dedication of Metro’s engineers and design staff in developing what is truly a cutting edge facility to meet State requirements and deliver ongoing operating savings for the Authority. Check out Metro’s video of the project and let us know what you think.

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