Nurses Retreat Sewage Pump Station Odour Control Unit

Nurses Retreat Proposed Odour Control Unit

The generation of odour at Nurses Retreat Sewage Pump Station

The nature of the Wynyard sewerage network is that wastewater becomes ‘stale’ as it passes through the system which generates odourous and corrosive gasses. This is more pronounced in the section leading to the Nurses Retreat Sewage Pump Station (SPS); the final stop before the waste is pumped to the Wynyard Sewage Treatment Plant.

At this point the gasses can escape into the atmosphere impacting surrounding properties and degrading electrical infrastructure at the pump station.

In response to continued complaints from customers surrounding the SPS, TasWater commissioned a report investigatingContinue reading

Nurses Retreat Proposed Odour Control Unit

The generation of odour at Nurses Retreat Sewage Pump Station

The nature of the Wynyard sewerage network is that wastewater becomes ‘stale’ as it passes through the system which generates odourous and corrosive gasses. This is more pronounced in the section leading to the Nurses Retreat Sewage Pump Station (SPS); the final stop before the waste is pumped to the Wynyard Sewage Treatment Plant.

At this point the gasses can escape into the atmosphere impacting surrounding properties and degrading electrical infrastructure at the pump station.

In response to continued complaints from customers surrounding the SPS, TasWater commissioned a report investigating ways to manage the odour.

The report identified the need for dosing with a chemical into the network until an odour control unit (OCU) can be installed at the Nurses retreat site.

The chemical dosing has been seen to reduce the levels of hydrogen sulphide generated by the wastewater but does not remove them. We have little control over external factors such as weather and changes to the waste stream and, as such, we cannot guarantee that the odour won’t return in the future.

The corrosive sulphide gas presents a significant risk to our infrastructure, regularly degrading the electrical components of the SPS and risking power failure to the site which would cause sewage to backup and overflow from the SPS.

The Proposed Solution

The proposed OCU is the smallest solution available to achieve the technical specifications required and will remove 99% of the gasses from the air inside the pump station.

The unit has a footprint of 1.5 x 3m and consists of a cylindrical unit and associated pipework. An image of the unit and a series of artists impressions can be found on the right. The unit is designed so that, once removed, the site will be returned to its previous state.

After feedback from the community, TasWater has committed to removing the OCU unit after three years. This has become a condition of the planning application DA 163/2015 approved by Waratah/Wynyard Council on 15 February 2016.

TasWater is currently undertaking investigations into re-configuring the sewage network and upgrading the Wynyard Sewage treatment Plant. Under our Price and Services Plan 2015-18, TasWater has committed $17M to the future upgrades of the Wynyard Sewage network which will see major upgrades to the Wynyard Sewage service within the next 3 – 5 years.

A new Dissolved Air Filtration (DAF) unit is under construction at the Fonterra plant. A new pipeline is planned to be constructed to transfer the treated outlet from the Fonterra DAF plant to the existing Wynyard sewage treatment plant. By removing a large percentage of the high strength waste from the existing sewage network, the load on the system at the Sewage treatment plant and at the Nurses Retreat pump station will be reduced and may remove the need for odour management.

For more information about the Nurses Retreat odour control project, please contact TasWater Community Engagement Officer, John J Murray, on (03) 6422 5422 or via email at john.j.murray@taswater.com.au

  • Nurses Retreat Odour Control Unit Community Feedback Survey

    TasWater is seeking feedback from the community on the visual impact of the proposed odour control unit at the Nurses Retreat Sewage Pump Station.

    In particular we would like your thoughts on the colour of the unit, the fencing around it and whether you think it should be shaded by planting or signage or kept to a minimal design.

    We encourage you to be creative however after the three years is up we would like to remove the unit and return the site to its previous state.

    TasWater is seeking feedback from the community on the visual impact of the proposed odour control unit at the Nurses Retreat Sewage Pump Station.

    In particular we would like your thoughts on the colour of the unit, the fencing around it and whether you think it should be shaded by planting or signage or kept to a minimal design.

    We encourage you to be creative however after the three years is up we would like to remove the unit and return the site to its previous state.

    Take Survey