Dungog Wastewater Treatment Plant


The Dungog Wastewater Treatment Plant (WWTP) was commissioned in 1938, making it over 80+ years old. Hunter Water Corporation (Hunter Water) acquired the plant from Dungog Shire Council in 2008.   This plant services a township of just over 2,000 residents (just north of Newcastle) and is right in the middle of dairy and timber country. The existing plant has just completed a $28 million upgrade project to improve water quality, which we were proudly part of.

The new upgrades will replace the plant’s ageing infrastructure and provide the town of Dungog and surrounding areas with a modern wastewater treatment plant, allowing for better reuse of effluent and recycled water and improved water quality for the community. Hunter Water Managing Director Darren Cleary said the major upgrade would also help deliver improved environmental outcomes.


The project brief was to build a temporary plant to the side while they demolished the old plant to build a modern facility without disrupting the treatment plant.  One critical component was the dosing of Sodium Hydroxide into the wastewater.

The build team required a complete solution they could connect and turn on without building unnecessary infrastructure around it, which ultimately would need to be torn down in the new build.


With any new build, there are complexities that need to be thought through. This particular design team had an added challenge of ‘shoe-horning a new plant on the same site as the existing plant, which had to remain operational at all times.

We provided two 30,000ltr Self Bunded Chemical tanks with a dosing system to help dose Sodium Hydroxide into the wastewater. A fully integrated dosing system was housed within each cabinet of the 30,000ltr Self Bunded Chemical tanks. As Sodium Hydroxide is suitable for our polyethylene tanks, it was a perfect solution.

The designers provided us with a detailed P&ID for the dosing system to ensure they received a system that ideally suited their application. Our Self Bunded tanks comply with AS3780 (bund capacity of 110%), so the installation crew did not require the expensive and unnecessary construction of a concrete bund.  Ultimately, the end solution Polymaster provided is cost-effective and efficient – saving time and money.

In addition, the installers were able to connect the ‘turn-key system’ with minimal on-site works, enabling the plant to operate continually. Great job to all involved!  The Dungog plant is now complete, and we’re super pleased to have played a little but crucial part in keeping the operation humming along during the build.  The plant is a showpiece of modern technology and innovative design.


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