Little Patuxent Water Reclamation Plant Addition No. 7

Key Facts: Location: Savage, Md
Owner: Howard County, Md.
Contractor: Clark/US, a joint venture between Clark Construction Group, Bethesda, Md., and Ulliman Schutte Construction, Rockville, Md.
Engineer: PBS&J, Baltimore
Start Date: June 2009
Completion Date: Summer 2012

The $92-million Little Patuxent Water Reclamation Plant Addition No. 7 Enhanced Nutrient Removal Expansion and Improvements project in Savage, Md., will increase the plant�s ability to treat wastewater before its release into the Little Patuxent River and onward to Chesapeake Bay.

Clark/US, a joint venture between Clark Construction Group of Bethesda, Md., and Ulliman Schutte Construction of Rockville, Md., broke ground in June and is upgrading facilities for wastewater screening, disinfection and postaeration, biosolids, dewatering and final clarifiers. The team will install new tertiary denitrification and effluent polishing filters with a filter feed, backwash, backwash return and chemical feed facilities. Completion is scheduled for summer 2012.

The plant�s current capacity of 25 million gallons per day will meet Howard County�s needs through 2015, but with the expansion to 29 mgd, the plant should meet demand through 2030. The upgrades also will increase the plant�s ability to remove nitrogen and phosphorus from the wastewater.

Upon completion, the Little Patuxent River Water Reclamation Plant will remove 37,000 lbs of suspended solids, 4,730 lbs of nitrogen and 965 lbs of phosphorus every day.