Toronto Wastewater Treatment Works Upgrade

NSW
Hunter Water
2022 - 2025

Abergeldie was engaged by Hunter Water to deliver Package 2 under the Toronto Wastewater Treatment Works (WWTW) upgrade. The works involved the installation of a new odour control facility (OCF), the implementation of an onsite recycled effluent system, and an upgrade to the control network infrastructure. Serving the region from Teralba to Wangi Wangi on Lake Macquarie's western side, the upgrade has improved capacity and performance, minimised odours, and adheres to contemporary safety and environmental standards. 

Scope of works

The scope of works included: 

  • Installation of a biotrickling filter tower system, offering the versatility to incorporate an activated carbon system, elevated vent stack, odour extraction system, and related components.
  • Modification of existing odour covers and ductwork at the inlet works and flow splitter chamber to integrate with the new OCF.
  • Installation of a new onsite recycled effluent system, including effluent pumps, storage tank, strainers, booster pumps, onsite reuse pipelines, and pump shelter.
  • Upgrades to the control network infrastructure.
  • Associated earthworks, civil, structural, mechanical, and electrical tasks. 

Collaborative approach

Abergeldie delivered the work under a panel arrangement and worked collaboratively with Hunter Water and its plant operator, Veolia. By attending monthly meetings and workshops, the team worked closely with all stakeholders to optimise design solutions. This collaboration provided valuable insights into the plant's operations and ensured visibility on issues that were not directly observable, enhancing the overall delivery of the project.

Optimising design and site layout for cost efficiency

Abergeldie worked closely with Hunter Water and the plant operator, to optimise the design for functionality and cost efficiency. The original plan called for two biotrickling filters and an Active Carbon Unit. However, one biotrickling filter was removed after consultation, significantly reducing costs. Abergeldie also suggested taking the active carbon unit offline during winter to extend its carbon life and lower operational expenses, using only the biotrickling filter during this period.

The team further refined the site layout, positioning the recycled effluent pump station and odour control unit together to share utilities. This reduced trenching and connection costs while improving site operations.

Improved WWTW for community reliability and sustainability

Abergeldie’s contribution to this project has ensured the continued reliable service of the treatment works for the local community in the future. The upgrade will improve capacity and performance, mitigate odour issues, and align with modern safety and environmental standards. Additionally, it will enable the utilisation of treated recycled water onsite, reducing reliance on drinking water to meet the wastewater treatment works’ process requirements.