North Head Wastewater Treatment Plant upgrade

We replaced the odour control system (scrubber) on the Northern Suburbs Ocean Outfall Sewer (NSOOS) system early in 2017.

This will improve odour management at North Head Wastewater Treatment Plant.  
Some related projects remain and will continue until mid 2018.

Aerial view of treatment plant surrounded by trees and ocean cliffs

Our work is essential to ensure the treatment plant runs efficiently and reliably.

About the project

Illustration within photo of future work at the treatment plant

Select the image to see a larger version of the new  infrastructure.

We’ve replaced the existing Northern Suburbs Ocean Outfall Sewer (NSOOS) odour control system at North Head Wastewater Treatment Plant.
The system treats air from the NSOOS as well as the underground screenings area of the plant.

We have:

  • replaced the existing scrubber with nine bio-trickling filters(BTF) and associated infrastructure including duct work, a ventilation stack and water tank
  • modified the underground ventilation system at the plant
  • tested the BTF to confirm reliability during operation at the North Head Wastewater Treatment Plant.

In 2017, we built a standby polishing scrubber that will operate in the unlikely event the BTF is not performing as expected.
In March 2018, we'll decommission and dismantle the existing NSOOS chemical scrubber now that the BTF and standby polishing scrubber are operational.

There will be minimal impacts on the environment during construction and commissioning of the new infrastructure.

Read more about how we're planning to upgrade the biosolids treatment process at North Head Wastewater Treatment Plant

Work on this project at North Head Wastewater Treatment Plant is almost done.

Proposed timeline

October 2013 to November 2013 Review of environmental factors on display
March 2014 to September 2014 Detailed design work
June 2014 to October 2015 Construction
October 2015 to December 2017 Commissioning of the new infrastructure
January 2018 to March 2018 Dismantling and removing the old odour scrubber from site

Large grey pipes on concrete structure

The new Bio Trickling Filters have now been installed.

To learn more, contact our Community Relations Team by:

Sydney Water
Community Relations – Wastewater Treatment Plants
PO Box 399