Case Study: New Technology Enhances Data Monitoring, Reduces Community Energy BillSource: Schneider Electric
Northwest of Hartford, Conn., are the towns of Simsbury, Avon and Granby. These towns share a history that began before the Revolutionary War, but in the 1970s, they became linked in another way: through the Simsbury Water Pollution Control Facility. This 3.8 million gallons per day (MGD)-rated facility processes about 2.2 MGD and receives 70 percent of its water from Simsbury, 25 percent from Avon and 5 percent from Granby.
In the early 1970s, Simsbury, Granby and Avon had separate sewer systems and treatment facilities. Most of these municipalities used either Imhoff tanks or lagoons for water treatment. When it became apparent that the Clean Water Act would be created in 1972, Simsbury decided to upgrade to a conventional activated sludge facility. Soon after, treatment quality, costs and regulations led the other cities to integrate into Simsbury's new activated sludge facility. In 2006, the facility upgraded to a modified nutrient removal process based around an Eimco® Oxidation Ditch. The 2006 upgrade was extensive and also introduced a completely new electrical distribution and control system to the facility.
The current treatment system consists of influent screens, a vortex grit classifier, rectangular primary clarifiers with chain and rake sludge extraction, a ditch-based nutrient removal system, circular secondary clarifiers, a belt press, and ultraviolet (UV) disinfection. Flow into the facility is predominantly sanitary and comes through three sewers via five main pump stations and four flow meters. Pressed biosolids are sent to an incinerator. The lift stations use dial-up phone lines to report alarms, and the flow meters report data via manual download.