Noosa Ozone Generators Replacement Lake MacDonald

About the project

Pensar was engaged to upgrade the Noosa Water Treatment Plant (WTP) to ensure safe and reliable treatment of water from the Mary River and Lake MacDonald.


Lake MacDonald, Queensland

Client & Duration

August 2018 - February 2019

Project Scope

  • Decommissioning of existing ozone generators
  • Structural modification of concrete plinths to suit new unit’s footprint
  • Installation and commissioning of two new ozone generators
  • Modification of pipework to inlet and outlet lines for service water, dry air and ozone
  • All electrical works, including disconnection of redundant systems and installation of new equipment
  • Supply, installation, testing and commissioning of ozone diffuser discs and associated 316SS pipework
  • Supply, installation and commissioning of three desiccant dryers and associated 316SS pipework
  • Installation of air-conditioning system in the ozone room


  • The project had to be completed within a tight timeframe as the new generators had to be operational before peak flow periods
  • The works required confined space work and working at heights
  • Risk of residual ozone and possible leaks had to be managed via testing methodology and continuous air monitoring
  • Planning and scheduling of activities
  • Had to ensure that sufficient drinking water was available during shut-down periods
  • Commissioning had to be performed by specialist engineers with limited availability
  • Works and products had to meet the requirements of AS4020 ‘testing of products for use in contact with drinking water’


  • The project team collaborated with plant operators to optimise plant shutdowns
  • All works were completed ahead of schedule, minimising impact to plant operations
  • The controls implemented ensured zero safety incidents despite the high-risk activities and work environment; including confined spaces, HV connections, high concentration of ozone and working at heights
  • The plant operators and project manager expressed their satisfaction with the team’s performance onsite

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