An important part of the rehabilitation process is the extraction, collection, treatment and disposal of water that has come into contact with waste, called leachate.
Cleanaway currently manages and oversees the rehabilitation and post closure works of landfills in Carroll Road, Clayton, Deals Road, Fraser Road, Ryans Road and Victory Road. Post Closure Specialist Srikar Rapole gives an insight into what it takes to rehabilitate landfills that have reached full capacity.
By Srikar Rapole
Highly engineered landfill sites at Fraser Road, Deals Road, Carroll Road and Victory Road were licenced to accept household and commercial residual waste, construction and demolition waste and other treated waste types but have since reached capacity.
This is when the rehabilitation and post closure phase kicks in to ensure the land is restored, protected and returned to the community in optimum condition. An important part of the rehabilitation process is the extraction, collection, treatment and disposal of water that has come into contact with waste, called leachate.
Leachate in the landfills and storage ponds is isolated from the natural ground using engineered layers that prevent contact with the groundwater and natural habitat. Leachate is collected at the base of the landfill and pumped from wells into a system of pipelines that transfer the leachate to storage ponds, all according to strict regulatory requirements. Aerators in the storage ponds help treat the leachate to the required quality for disposal.
As part of the ongoing rehabilitation of these sites, some of the existing infrastructure is also being upgraded to ensure optimal performance. Pond 5 has recently been rectified including:
removal of sediment and build up in the bottom of the pond
removal and replacement of unsuitable soils from the subgrade layer of the pond
installation of new geomembrane liner on the base and walls of the pond including gas system
installation of new perimeter fencing and lifesaving equipment
procurement of new aerators designed to effectively treat the leachate in Pond 5 while being more energy efficient.
Pictured: The largest pond midway through the rectification process
Here are a few interesting facts about our Fraser Road ponds:
Altogether the ponds have a holding capacity of over 60ML – that’s over twenty Olympic sized swimming pools!
The largest dam can hold over 44 million schooners
Over a year we will be aiming to treat up to 100ML of leachate water – it would take an average household over 500 years to go through this amount of water
Cleanaway’s engineering and stakeholder engagement team continue to work closely with the local community, council and the Environmental Protection Authority (EPA) to provide long term benefits from landfill sites and minimise any impact on the community and environment.
Contact us to learn more about how we’re making a sustainable future possible in the communities where we operate.