WWTP Expansion Planning & Design Services

The Hampton Roads Sanitary District (HRSD) in Virginia selected Weston & Sampson and AH Environmental to design a complete facility upgrade and expansion of the King William wastewater treatment plant (WWTP), from 100,000-gpd facility to 200,000 gpd.

The original planning recommendation was to upgrade the existing WWTP to a new larger membrane bioreactor (MBR) process. Our team worked with HRSD to refine the process decision for the expansion, and a sequencing batch reactor (SBR) process was selected for the upgrade. After preliminary design completion, final design was initiated. Process modeling was used to advance the design including process modeling software and Revit 3D design software was used for detailed systems and structures design. The system is designed to achieve an effluent total nitrogen of 3 mg/l and a total phosphorus of 0.3 mg/l and includes provisions for subsequent expansion to 300,000 gpd average daily flow. The plant also has provisions for the reuse of final effluent at a nearby industrial facility.