Project Start Date

April 2015

Project Completion Date

October 2016


Yarra Valley Water

Comdain's Role

Principal Contractor




Distribution Infrastructure

Electrical, Mechanical & Instrumentation

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Design, supply, installation and commissioning of new aeration diffusers and pipework for four aeration tanks at Craigieburn STP.

Works Undertaken

  • Design, Supply, Installation and Commissioning of fine bubble diffuser system, pipework and valves
  • Inspection and reporting of tank conditions
  • Refurbishment works, coating and minor repairs to tank internals
  • Relining and connections to WAS and RAS pipelines with PE pipe
  • Design and installation of RAS pump Bund
  • Design, supply and installation of access platforms
  • Design, supply and installation of scraper motor and gearbox
  • Replacement and upgrade of recycled water spray lines and wash down lines

Highlights & Innovations

  • The design of the diffuser system installed has a very efficient transfer oxygen rate reducing the amount of air required to reach the desired DO level in and therefore reduces aeration time, blowers run time and running costs.
  • Coordinating other essential maintenance works with operational personnel whilst tank is immobilised minimising tank down time.
  • Scraper motor and gearbox fitted with an overload switch which provides protection to the scraper if it fails and reduces the risk of tank damage.