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Treatment to improve Chesapeake Bay water

Xylem’s advanced treatment technology will play a key role in an initiative to improve water quality in the Chesapeake Bay. The company has been awarded a contract to provide an existing wastewater treatment plant with technology to assist in nutrient removal.

The City of Frederick, Maryland, is a contributor to the Chesapeake Bay watershed, the water quality of which is being damaged due to excess nutrients entering the system. These nutrients fuel the growth of algae blooms, which in large quantities can block sunlight to underwater grasses and remove oxygen from the water preventing the bay from acting as a healthy ecosystem.

“The Chesapeake Bay area is a unique ecosystem that needs to be protected,” said Marc Stachowski, Deputy Director of Public Works for the City of Frederick. “It is our goal to comply with the requirements of the Chesapeake Bay Initiative Enhanced Nutrient Removal program and, as part of this process, the city is converting a key element of its water treatment process from chemical (chlorine) to ultraviolet (UV) disinfection. Xylem is supporting this project by developing innovative and sustainable ways to reduce the levels of nitrate nitrogen and total phosphorus in the water before it is discharged into the Chesapeake Bay.”

Supporting long-term sustainability

“We are pleased that our technology and expertise will support the long-term sustainability of this important waterway,” said Greg Claffey, Xylem’s Director of Treatment Sales for North America. “By switching from chlorine to UV disinfection, the City of Frederick will reduce the disinfection by-products going back into receiving streams. Furthermore, the removal of chlorine makes the site and the surrounding community a safer place to live and work.”

Xylem will also provide training and service support to the facility’s operators as the plant shifts from chlorine to UV disinfection to ensure a smooth and efficient transition.

Construction is scheduled to take place later this year, with the plant scheduled to be in operation in mid-2017.

About the solution

The Xylem solutions that will be used in this project include a Leopold elimi-NITE denitrification system, Sanitaire Silver Series II membrane disc diffusers and Wedeco’s TAK 55 UV disinfection system.

Leopold’s elimi-NITE deep bed filter system will use methanol as a carbon source to grow biology within the filter bed to reduce nitrate nitrogen to less than 1 mg/l (milligram/liter). Total Phosphorus levels will be reduced through the system to levels of less than 0.3 mg/l TP (Total Phosphorus). The Sanitaire aeration systems will be installed in swing zone tankage, anoxic/equalization tankage and the effluent channel at the plant for purposes of secondary treatment and oxidation of organic material as well ammonia removal.

by Simon