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Digester & Heating Upgrades

The Digester & Heating Upgrades Project involves the construction of a fourth digester and required ancillary equipment which will improve capacity for solids and gas.

This project also includes the installation of new mechanical mixing and gas handling systems, new electrical and mechanical connections, a new heat exchanger, new boilers, modifications to pumping and sludge feeds, modification and relocation of utilities, and associated works including landscaping. Construction notice with site map (PDF).

The Digester & Heating Upgrades Project is a 3-year, $48.2 million project, expected to be completed in winter 2022. This project is funded by the Government of Canada ($9.5 million) and Government of Saskatchewan ($9.5 million) through their New Building Canada Fund, with a $29.2 million investment by the City of Saskatoon.

  Fourth Digester Tank

Above: Rendering of new gas scrubbing and heating building

Frequently Asked Questions

What are digesters?

  • Digesters are the last stage in the wastewater treatment process. The solids removed during the treatment process are held in an oxygen deprived environment to allow bacteria to form and break the solids down.
  • The digesters produce two types of renewable resources; biogas (energy) and biosolids (soil nutrient).
  • This expansion includes a new sustainable energy recovery process that will condition biogas to be used as fuel in the boilers while the solid matter is used as nutrient for local crops.

Why is a fourth digester being built?

  • Construction of a fourth digester tank will improve capacity and will allow the City to maintain Water Security Agency processing standards when a digester is taken out of service for maintenance purposes.
  • Upgrades to boilers will also be made to accommodate the additional heat that will be required to run all four digesters.

Will residents in neighbourhoods surrounding the Wastewater Treatment Plant be affected?

  • Residents may see additional traffic near the Wastewater Treatment Plant. Due to the residential location of the Wastewater Treatment Plant, all large traffic will be required to use the appropriate Haul Route which is Lenore Drive.
  • Residents may hear noise from construction activities including hydro-excavation, drilling, and demolition near the Wastewater Treatment Plant.
  • After construction is complete, residents will no longer see an open flame as the existing flare is being replaced with two enclosed flares.