Project Completion Date

August 2017



Comdain's Role

Principal Contractor

Value Range Category

$5m - $10m




Electrical, Mechanical & Instrumentation

Treatment Infrastructure

The North Pine Water Treatment Plant (WTP) is the region’s second largest WTP with a nominal capacity of 250ML/d and was connected to the South East Queensland (SEQ) Water Grid in 2008 via the Northern Pipeline Interconnector. It is a conventional treatment plant using coagulation, sedimentation, sand filtration and chloramination.

The main reason for the works was to mitigate the risk of a failure recurrence in meeting supply during severe wet weather events, following the 2011 SEQ floods. The failures in 2011 impacted water quality and supply to the Brisbane area.

Works Undertaken

  • Demolition of the internal filter structures of filters 1, 2, 3 and 5 and construction of new reinforced concrete gullet walls
  • Filter under drain system refurbishment requiring the removal of compromised asbestos cement piping to eliminate risk of failure and maintenance workers safety.
  • Replacement of 20 year old filter media reducing operational inefficiencies and turbidity water quality excursions.
  • Installation of new filter air backwash system.
  • Design and construction of new blower facility including all civil, structural, mechanical, electrical and instrumentation scopes.
  • Construction of new caustic dosing facility including dosing tanks, dosing board, chemical unloading bund, injection points, control panel, double contained pipework, PLC and SCADA integration.


Highlights & Innovations

  • ­Installed a purpose built gantry crane to remove the reinforced concrete sections during the demolition of the filters and handling of new stainless steel piping and filter media minimising manual handling.
  • ­ Project delivered in a Safe manner, with no LTI’s and positive feedback in regards to the safety culture on-site from Seqwater.

“…Nothing has been too much trouble for your team to ensure that we continue to produce water within our guidelines while you have continued to push forward with the project. However, the greatest appreciation is for the safe manner you tackle your works, ensuring not only the safety of your own staff but the inclusion of all Seqwater staff and visitors”

Terry Martin Coordinator, South East Queensland Water