Northfield Wastewater Treatment Facility

Northfield, Vermont | Town of Northfield

The 40-year-old Northfield Wastewater Treatment Facility (WWTF) required a comprehensive upgrade of the facility and process conversion from Trickling Filter (TF) to Sequencing Batch Reactor (SBR) to comply with stringent phosphorous limitations. The site was constrained by the railroad and the Dog River, requiring geotechnical measures to protect rails. D&K conducted all professional engineering services associated with the facility, including structural, civil, electrical, mechanical, and construction inspection and management.

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Project Elements

• Replaced outdated headworks with a fine screen and aerated grit chamber to improve the removal of inorganics and FOG
• Completed upgrade/replacement of biosolids processing, including replacement of anaerobic digesters with aerated sludge storage, evaluation of alternative sludge dewatering technologies, a new centrifuge and dewatered sludge screw conveyor, and efficient on-site storage/off-site hauling

Sustainable Elements

• Energy-efficient design techniques included premium efficient motors, a blower room heat recovery system, innovative daylighting building control, and a new SCADA system for improved on-site/off-site monitoring
• Reuse of an existing TF tank for post-SBR flow equalization, resulting a in $200,000 savings
• Elimination of a public health/safety threat by converting from a one-ton gas chlorine to liquid chlorination/dechlorination system.