The Treatment ProcessEvery day approximately 11 million gallons of wastewater flows from Nashua and Hudson into the Nashua Wastewater Treatment Facility. Wastewater is sent from homes, businesses, and industries into Nashua’s sewer/collection system. At the facility, the wastewater is channeled through several different treatment processes to remove pollutants before being discharged into the Merrimack River.
Preliminary TreatmentIn preliminary treatment, two mechanical bar screens are used to remove large solids and other coarse debris that might damage downstream pumps and other equipment. The flow then proceeds to aerated grit chambers where the grit and sand is allowed to settle. This material is washed and loaded into trucks for disposal at the city’s landfill.
Nashua Wastewater Treatment Facility
Primary Sedimentation Tanks