Previous Project Case Studies
Water and Wastewater Treatment System Design Projects
Wetland Bed at Black Rock Retreat
This recirculating sand filter/constructed wetland system was installed at Black Rock Retreat in Lancaster County, PA in October 2001.  This wastewater treatment system was funded in total by a new and innovative technologies grant from the Pennsylvania Department of Environmental Protection.  This system replaced a sequential batch reactor wastewater treatment system. The SBR had been installed in 1998 at Black Rock Retreat but failed to meet the discharge limits for total nitrogen.  The key advantage of the recirculating sand filter/wetland system is the separation of aerobic and anoxic treatment zones to accomplish denitrification.  This approach eliminates the need for expensive process control equipment typically required where the design attempts to fluctuate between these two treatment states within one reactor.
In January of 1999, the University of Pennsylvania's Veterinary School (New Bolton Center) contacted Whitehill Consulting Engineers to resolve a problem related to the corrosivity of their water supply.  The Veterinary Campus had experienced elevated lead and copper levels in water samples as well as frequent copper plumbing failures.  By March of that year the treatment system had been installed and samples collected in April brought this facility back into compliance with the lead and copper rule.  Additional benefits noted by the staff were a significant decrease in copper plumbing leaks and improved wastewater treatment performance. 
Caustic Soda and Sodium Hypochlorite Feed Arrangement
Musser's Market RSF/Wetland WWTP
Shown at left is the Recirculating Sand Filter/Constructed Wetland Wastewater Treatment Plant constructed in July and placed in service in August of 2002.  This treatment system is designed to provide tertiary (total nitrogen removal) treatment for the Musser's Market complex waste flow.  The advantage of this system is the separation of aerobic and anoxic treatment phases.  This results in much lower operator attention to maintain the plant.  The effluent quality from this plant met discharge limits during it's first month of operation and has maintained compliance since.  The treated water leaving the wetland is so well purified that it meets disinfection requirements without further treatment.  The effluent is so clear that when placed next to well water it matches its clarity.