Sustainable Design > Project Case Study

Water Pollution Control Facility Upgrade

The Killingly Water Pollution Control Authority owns and operates a wastewater treatment plant that receives an average daily flow of 3.0 MGD. Septage received from 18 neighboring towns is typically ten percent of the flow and six percent of the BOD loading. The influent is three times the strength of typical domestic wastewater due to high industrial content.

Septage received at the facility was originally discharged to an open sump from which the septage drained to the headworks. A new septage receiving facility, sized for an average flow of 30,000 GPD, was provided. The facility includes a septage screening unit that removes large solids from the septage and discharges the solids into a dumpster for disposal; an aerated septage holding tank that allows the septage to be metered into the plant during low BOD loading periods; odor control equipment consisting of chlorination equipment and biological filters; a septage receiving building; and a personal identification number (PIN) access system that allows septage haulers to activate the septage screening unit for discharge of septage while the unit records date, time discharge volume and other information for billing and record keeping purposes.

Energy Recovery and Reuse

Wright-Pierce designs often include features that recover and re-use energy that would be either excess waste heat or simply lost through high ventilation rates. While these design features are typically very simple and inexpensive, they yield significant savings. An example of a re-use design is the Roger’s Village Pump Station in Killingly where the energy that would be lost by high ventilation requirements for the below grade pump room is recovered and re-used through a heat recovery ventilator which recovers 75% of the heat.

Wright-Pierce worked with the WPCA and the industry to obtain 100% funding for filter improvements from the local industry and 50% grant funding for the energy saving aeration system.

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