Seneca Creek Wastewater Treatment Plant (WWTP) Enhanced Nutrient Removal (ENR) and Plant Expansion Project

Client: Washington Suburban Sanitary Commission
Location: Germantown, Maryland
Services: Cost Estimating
Completion Date: 2009

Project Details:
Keville Enterprises provided cost estimating services in connection with the $30M  upgrade to the Seneca Creek Wastewater Treatment Plant in Germantown, MD. The project involved upgrading the existing 20 million gallons per day (mgd) Seneca Creek Wastewater Treatment Plant (WWTP) with Enhanced Nutrient Removal (ENR) technology. Additionally, this plant plans to upgrade to 26 million gallons per day (mgd). Upon completion of the upgrade, this WWTP will be capable of achieving an effluent with Total Nitrogen goal of 3 mg/l and a Total Phosphorus goal of 0.18 mg/l. Project elements included:

• conversion of the existing four basins to flexible Modified Ludzack-Ettinger (MLE) mode
• construction of a secondary clarifier and a fifth aeration basin
• expansion of the filter gallery to include new de-nitrification sand filters
• construction of a methanol carbon storage/distribution facility
• construction of sludge de-watering and handling facility

Keville served as the cost estimating sub-consultant to PBS&J for the WSSC.