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Wastewater Treatment Facility Improvements

The City of Manchester owns and operates the largest wastewater treatment facility in New Hampshire. The facility has a design maximum monthly flow capacity of 35 MGD and peak wet weather flows of 80 MGD.

In order to improve efficiency and reduce costs, the old belt filter presses used to dewater biosolids were replaced. Following evaluation and pilot testing of various replacement alternatives, centrifuges were selected. The new dewatering facility provided immediate benefits, specifically, reducing operating costs by approximately $500,000 per year, and more importantly, restoring reliability to the critical task of biosolids processing.

Wright-Pierce has completed several projects for the City including the following:

  • Comprehensive odor control assessment
  • Upgrade of influent pump station facility, including new screening facilities, SCADA systems and HVAC improvements
  • Secondary clarifier evaluation
  • Development of a master plan for the sludge handling facilities including  thickening, storage, dewatering, cake storage and incineration
  • Upgrade of the dewatering facilities with new centrifuge and cake conveyors as well as incinerator feed pumping improvements
  • Currently developing a capital improvements plan for the 9 municipal pump stations in the collection system.

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Project Highlights

Largest wastewater treatment facility in New Hampshire with a design average flow 35 MGD and peak wet weather flow of 80 MGD.

The new dewatering facility provided immediate benefits, specifically, reducing operating costs by approximately $500,000 per year, and more importantly, restoring reliability to the critical task of biosolids processing.

Multiple plant upgrades include:

  • Odor control assessment
  • Influent pump station upgrades
  • Master plan developed for sludge handling facilities
  • Upgrade of dewatering facilities
  • Development of CIP for 9 collection system pump stations