Randolph Wastewater Treatment Facility

Randolph, Vermont | Town of Randolph

The 40-year-old wastewater treatment facility, originally designed for a 20-year service life, was past due for a total treatment process change and facility upgrade. The project objectives included: utilize a state-of-the-art treatment process, design capacity for nitrogen removal, consider operational efficiencies and long-term operating costs, address issues with the location in a floodplain, and develop a demonstration facility that would be accessible for all users and could be used for educational purposes. D&K provided design, permitting, and construction phase services for an $8.9 million comprehensive upgrade of the facility. The D&K team designed a new sequencing batch reactor (SBR) to provide operational flexibility in the face of pending nutrient removal requirements in the Connecticut River drainage basin. The project included the addition of the VT 66 Siphon, which is a two-barrel siphon that conveys approximately 40% of the Town’s wastewater flow under Ayers Brook and to the wastewater treatment facility.

Markets:

Project Elements

• Project included new headworks, fine screen, grit removal, chlorine disinfection/dechlorination, aerated sludge storage, centrifuge dewatering, and a backup generator
• The VT 66 siphon comprises two 8-in HDPE siphon barrels, each approximately 1,800 ft long, along with associated inlet and outlet structures, as well as cleanouts along the siphon.
• This siphon allowed the Town to downsize the VT 66 Pump Station, as the siphon vastly reduces the flow handled by the VT 66 Pump Station.

Awards

Merit Award for Engineering Excellence, ACEC-VT

Sustainable Elements

Using a holistic and integrated design approach, opportunities were maximized to incorporate energy conservation and renewable energy features into the upgraded facility while minimizing operational and maintenance costs.