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Toronto WWTW Diffuser & EAT Upgrade

About the project

This project involves the design and construction of an upgrade to the Extended Aeration Tanks (EAT) at the Toronto wastewater treatment works (WWTW) to facilitate better air diffusion.

Location

Toronto, New South Wales

Client & Duration

Hunter Water Corporation
September 2022 - August 2024

Project Scope

  • Assessment of diffusers in the marketplace and justification including consideration to future O&M of the system
  • Installation of a new diffuser lifting frame and diffusers, and commissioning while EAT 1 was in operation
  • Decanting of EAT 1 & 2, hydromine sludge and clear out EATs
  • Replacement of all six decant weirs, risers and trumpets
  • Concrete repairs to both EATs
  • Commissioning of the two new diffuser systems.

Challenges

  • Optioneering a suitable lifting frame to minimise future issues with lifting frames and providing suitable durability was a challenge that our project team navigated through in close collaboration with Hunter Water
  • Undertaking removal and installation works in a brownfield environment whilst maintaining plant operations.

Achievements

  • Our team successfully removed and installed the diffuser systems within the EATs whilst keeping services operational
  • Desludging the EAT via hydromining provided a large cost benefit for Hunter Water Corporation
  • Ongoing collaboration and positive communication with Hunter Water Corporation led to successful outcomes for the design, construction and commissioning phases.

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