World’s largest fixed-film denitrification system to be installed at Baltimore WWTP




FORT WASHINGTON, PA, Feb. 10, 2014 -- The Back River Wastewater Treatment Plant (WWTP) in Baltimore, Md., will soon receive the largest fixed-film denitrification system in the world from Severn Trent Services, a global supplier of water and wastewater treatment solutions. Archer Western Contractors, LLC., awarded Severn Trent a contract to provide its TETRA® Denite® denitrification filter technology to the Black River WWTP. The TETRA fixed-film biological process will be used to reduce high levels of nutrients discharged into the Chesapeake Bay from the facility. The project is the second of two very large project bids won for Denite deep bed gravity filters in the Bay area, the first being the Patapsco WWTP, which currently ranks as the largest in the world. The $24-million project's unique design will consist of 52 filters -- four sets of 13, 11'- 8" x 100'- 0" filters (3.6m X 30.5m). Each set will operate independently of the others with its own controls and operation programming, and all 13 systems will share the same backwash and chemical feed system. The filters were designed to operate independently due to varying flows, allowing the filter sets to be backwashed at once. This design eliminates downtime for backwashing and provides greater operational flexibility in meeting stringent Total Maximum Daily Load (TMDL) limits set forth by the Maryland Department Of Environment and the Environmental Protection Agency (EPA).