Repairing and protecting a 1950s era wastewater digester tank

Environmental Science & Engineering Magazine | June 2021
Leigh Besanger, BEng, EIT | Engineer-in-Training and Daryl Prefontaine, BSc, MEng, P.Eng. | Principal

Wastewater treatment plant (WWTP) maintenance and upgrading programs can sometimes unearth issues that may not be apparent during regular operation. Such an occurrence happened at a WWTP consisting of eight digesters constructed at various times between 1955 and 2010. The plant had recently completed upgrades to a circa 1955 digester tank, requiring it to be taken out of service for an extended period of time, as part of ongoing maintenance and facility upgrading programs.

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