Wastewater treatment

  • The GMWC facility is the largest wastewater treatment plant in the Province of New Brunswick.
  • 34.2 Kilometers of collector sewers run from Dieppe, Moncton and Riverview to the Greater Moncton Wastewater Treatment Facility.
  • A 1100-meter tunnel conveys wastewater under the Petitcodiac River to the treatment Facility.
  • The Greater Moncton Wastewater Commission can efficiently collect and provide primary treatment to 115 000 cubic meters of wastewater per day.
  • The main pumping station is as tall as a 12-storey building-but nine of the stories are underground.
  • The Greater Moncton Wastewater Commission deals with the disposal of solids in an environmentally sound manner by removing them through treatment and using these biosolids to produce “AA” grade compost. 
  • The Greater Moncton Wastewater Commission compost facility produces 10,000 tonnes of compost per year.
  • The Wastewater Systems Effluents Regulations (WSER) enacted in June 2012 under the Fisheries Act has set the National Performance Standards for Carbonaceous Biochemical Oxygen Demand (CBOD5) and Total Suspended Solids (TSS) to 25 mg/L respectively. These concentrations are typical for secondary treatment facilities. 
  • The GMWC facility is a chemically assisted primary treatment plant, and the only wastewater treatment plant in the Province of New Brunswick without secondary treatment.
  • GMWC is currently not complying to the WSER National Performance Standards. The GMWC has therefore applied for a transitional authorization that will allow it to complete all upgrades to its wastewater facility to undertake secondary treatment and comply to the regulation before December 2020.
  • There are many processes for secondary treatment. GMWC has chosen a Biological Nutrient Removal (BNR) process that not only removes CBOD and TSS but nutrients that cause excessive algeal growth. No toxic chemicals will be used in this process.
  • GMWC requires $90.4 million dollars to upgrade its treatment facility to a secondary treatment plant.
  • Although the regulation does not require it to do so, the GMWC also plans to incorporate ultraviolet light treatment as part of its upgrades such as to disinfect the treated water prior to discharging it to the Petitcodiac River.


© GMWC, 2014. All rights reserved.