Oxidation Ditch Converted to Multi-Zone Activated Sludge Basin	Completed Deep Bed Filters	3D Rendering of CAD Model Used to Design the Deep Bed Filters

Wiley|Wilson recently completed a nutrient removal treatment upgrade at the Town of Tappahannock WWTP. The upgrade project successfully achieved effluent nutrient limits of 4 mg/l total nitrogen and 0.3 mg/l total phosphorus. The upgrade project converted the Town’s existing 0.8-MGD oxidation ditch activated sludge treatment system to a 5-stage Bardenpho process with enhanced biological phosphorus removal and insitu chemical addition for total phosphorus removal followed by deep bed sand filters capable of denitrication. Sustainable features of the project included conversion of the existing oxidation ditch basins to nutrient removal treatment basins, upgrades to the phosphorous treatment system to reduce chemical usage, and improved process monitoring to optimize power consumption and chemical use.

• Preliminary Engineering, Detailed Design, and Construction Administration
• Grant and Loan Funding Support, Permitting, and Compliance Services
• 3D Modeling to Assist in Client Visualization and Design Review
• Limit of Technology Nutrient Treatment
• 5-Stage Bardenpho Activated Sludge Process
• Deep Bed Sand Filters Capable of De-Nitrification
• Supplemental Carbon Storage and Feed Facility
• Sodium Hypochlorite (Basin Foam Control) and Polymer Storage and Feed Facility
• Aerobic Digester and Belt Filter Press