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Wastewater Treatment Plant Upgrades

Council is upgrading its two wastewater treatment plants (WWTP) located at Kincumber and Woy Woy. Kincumber WWTP is the region's major treatment facility servicing around 140,000 residents across most of Gosford City. Woy Woy WWTP services close to 40,000 residents across the Woy Woy Peninsula including Woy Woy Bay, Pearl Beach and Patonga.

Upgrade works at the plants will reduce odour emissions from the plants, and will also ensure they continue to have the capacity to provide for the growing future demands of the catchment area whilst meeting council's own carbon emission reduction targets.

The upgrade works involve

  • Upgrading the inlet works at both plants;
  • Improving the odour control and bio-solids handling systems at both plants;
  • Refurbishing the aeration and digester systems at the Kincumber plant; and
  • Other various associated works.

Council has engaged NSW Public Works to assist in the delivery of the project.

Project status

Completed works include: improved screening and grit removal, new odour control and scrubbing equipment, new bio-solids handling systems and a new highly efficient aeration system.

Significant upgrades have been completed at the Kincumber treatment plant to reduce odours within and surrounding the site. The inlet works at the Kincumber treatment plant have been covered and a new odour control facility now captures odours and treats them through a new biotrickling filter with activated carbon polishing before releasing them through a 15 metre stack.

In addition, major upgrades to the sludge dewatering and storage facilities at the Kincumber treatment plant have reduced the handling of sludge and length of time the sludge is stored on-site.

A new belt filter press removes more moisture from the sludge, eliminating the need for further onsite drying. Dewatered sludge is now stored in a covered hopper before direct transfer to trucks for beneficial reuse off-site.

Reduced handling and storage of the sludge on-site has minimised odours from this area of the plant. Council is now undertaking further odour sampling and analysis to better understand remaining sources of odour and refine future odour management works.

Information resources

For more information on the project you can click on the information resources below or contact council on (02) 4325 8222.

Fact sheets

Kincumber WWTP Upgrade – Project Update

Woy Woy WWTP Upgrade – Project Update

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