Severn Trent Services to Provide World’s Largest Fixed-film Denitrification System

Severn Trent Services, a leading global supplier of water and wastewater treatment solutions, was awarded a contract from Archer Western Contractors, LLC., to provide itsTETRA® Denite®denitrification filter technology to theBack River Wastewater Treatment Plant(WWTP) in Baltimore, Md. The TETRA Denite fixed-film biological denitrification process will be used to reduce high levels of nutrients discharged into the Chesapeake Bay from the Back River WWTP. Upon completion, the installation will be the largest fixed-film denitrification system in the world. The project is the second of two very large project bids won for Denite deep bed gravity filters in the Chesapeake Bay area, the first being thePatapsco 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. 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 down time for backwashing and provides greater operational flexibility in meeting stringent Total Maximum Daily Load limits set forth by the Maryland Department Of Environment and the U.S. Environmental Protection Agency. The new facility will handle the plant's permitted flow of 180 million gallons per day (818,296 cubic meters per day). The design engineer for the Back River WWTP project is Whitman, Requardt and Associates, LLP, of Baltimore.

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• Consumer Products
• Membranes