Baltimore Wastewater Treatment Plant Contracts for Denitrification System

The Baltimore City Department of Public Works’ Patapsco Wastewater Treatment Plant has contracted with Severn Trent Services for its TETRA® Denite® denitrification system.

The tertiary treatment system will help reduce the plant’s discharge of total nitrogen (TN) by more than 80 percent and total phosphorous (TP) by more than 90 percent, significantly reducing nutrients discharged to the Patapsco River and, ultimately, the Chesapeake Bay, according to a company press release. The treatment plant is undergoing upgrades and expansion over the next two years.

The contract for the denitrification system was awarded by Fru-Con Construction Corporation in Woodbridge, Va., the project’s general contractor. Rummel, Klepper & Kahl, LLP of Baltimore is the consulting engineer for the plant expansion and selected the system for use at the Patapsco facility.

The construction project, which is scheduled for completion in 2013, is designed to treat an average flow rate of 81 million gallons per day (mgd) and a maximum of 150 mgd. The denitrification system will enable the Patapsco facility to reduce nitrate-nitrogen (NO3-N) to 0.5 mg/L and total suspended solids (TSS) to 5 mg/L at the plant’s average flow rate. Severn Trent Services has provided a process performance guarantee for the effluent parameters of the Denite system.

Denite is a fixed-film biological denitrification process that also serves as a deep bed filtration system capable of removing suspended solids to virtually any final effluent level requirement.

According to Joe Bonazza, Filtration Business Unit director for Severn Trent Services, “The Chesapeake Bay is the nation’s largest estuary and has long been the focus of intensive government-sponsored restoration efforts, including strategies to reduce nitrogen and phosphorous discharges. Fixed-film biological denitrification has proven to be highly effective in helping wastewater treatment facilities meet low NO3-N, TSS and TN limits.”

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