A key part of operating the landfill is the management and treatment of stormwater and leachate. Leachate is the liquid that has come into contact with waste within the landfill cell.
The leachate is treated on site prior to being discharged to sewer in accordance with a trade waste agreement. Treatment using aeration helps break down the organic material within the leachate. Once the leachate meets the specifications of the trade waste agreement, the site seeks approval from the water authority to discharge the leachate to sewer. The leachate will then receive further treatment off site at the Eastern Treatment Plant.
Currently, we are treating leachate that has been on site for longer than its usual cycle. This is due to delays in a construction process. Typically, leachate would be treated more readily than currently experienced on site.
We welcome and thank you for your feedback. The site has made adjustments to our management process. We will do everything possible to minimise disruption.
Thank you - The Hallam Road Landfill Team.
SUEZ is completing the following actions:
Progress update (November 5, 2020):
Due to recent feedback, the site has completed further, comprehensive site investigations. The leachate being treated has predominantly been the key source of recent odour. Actions have been taken to address the management of leachate and the search has led to additional improvements, including:
Ongoing leachate sampling indicates that these measures are progressing and addressing the issue.
EPA Victoria has published a report summary: landfill odours and human health, which is available to view here.
Progress Update (November 11, 2020):
With the existing matured leachate responding well to aeration, the site has planned the filling of the remaining leachate treatment pond with adjustments in the management process.
The aeration has improved the chemistry and biology of the matured leachate, reducing odour over time.
This treated leachate will be used to help dilute the leachate entering the remaining pond from the landfill cells. By completing the process this way, the aerators will be able to commence treating the new leachate immediately.
The site also has cultures prepared to dose the ponds, speeding up the process. These cultures help address the biology of the ponds, much like a probiotic addresses gut health.
The site has plans to fill this pond during November. The initial filling has the potential to cause odour. These revised management actions have been undertaken to help reduce this odour.
If you would like to provide the site with feedback, please use the SUEZ Environmental Report Hotline or the EPA hotline below.
Progress Update (November 20, 2020):