WWTF Process Conversion, Upgrades, and Siphon Design

Randolph, Vermont

Process, civil, structural, mechanical and electrical design, permitting, and construction phase services for an $8.9 million comprehensive upgrade of the 40-year-old wastewater treatment facility that serves the Town of Randolph. D&K assembled a team of professionals including a local architect, geotechnical engineer, and energy management specialist. A new sequencing batch reactor (SBR) was designed to provide operational flexibility in the face of pending nutrient (including nitrogen) removal requirements in the Connecticut River drainage basin.

The project included new headworks, fine screen, grit removal, chlorine disinfection/dechlorination, aerated sludge storage, and centrifuge dewatering and a backup generator. Using a holistic and integrated design approach, opportunities were maximized to incorporate energy conservation and renewable energy features into the upgraded facility while minimizing ongoing operational and maintenance costs.

Included in the project is the Route 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. The siphon is comprised of two (2) 8-inch HDPE siphon barrels, each approximately 1,800 feet in length, along with associated inlet and outlet structures, as well as cleanouts along the siphon. This siphon allows the Town to downsize the Route 66 Pump Station, as the siphon vastly reduces the flow handled by the Route 66 Pump Station.