The value of waste: CDE

Waste Management Review explores how CDE wet processing technology is supporting Melbourne-based recycling company Repurpose It to reduce a reliance on landfills.

Operating from its 150-acre rehabilitated quarry site in Epping, Repurpose It has an ambitious vision to achieve a 100 per cent recycling rate across its complete waste portfolio.

Likewise, it aims to ensure zero unnecessary waste is destined for landfill. This vision is perfectly aligned with CDE, an industry-leading manufacturer of wet processing technologies, whose ethos is unlock a “New World of Resource”.

To achieve its aspirational environmental aims, George Hatzimanolis, CEO of Repurpose It, turned to CDE to design and engineer a state-of-the-art solution to transform construction, demolition and excavation (CD&E) waste, along with contaminated railway ballast, into in-spec sand and aggregate products that meet the requirements of the local building industry.

George says Repurpose It is committed to recycling products at the end of their lifecycle to transform them into materials that will be used at the beginning of a new lifecycle. These include waste previously considered difficult to process, he adds.

“To achieve 100 per cent recycling of construction and demolition waste, we required a wet processing solution that could efficiently separate and wash every available fraction of material in the feed,” George says.

CDE’s solution, a first-of-its-kind in Australia, incorporates a selection of modular elements that work in synergy to produce best-in-class results, including an AggMax logwasher, the latest in the CDE patented Infinity screening range, a ProGrade H2-60 screen, an EvoWash sand classification and dewatering system, conveyors, a decanter centrifuge and AquaCycle thickener.

Every day, the plant processes up to 150 tonnes an hour of CD&E waste into high-value construction products, which would have otherwise been bound for landfill.

CDE’s customised solution processes CD&E waste and rinses and grades it to make six in-spec products, four aggregates (4-10, 10-20, 20-150, 50-100 oversize) and two sands (0-2 and 0-4).

Daniel Webber, CDE Australasia Regional Manager, says entrepreneurial companies such as Repurpose It have identified that the Sydney Basin and Melbourne are running out of sand.

“The depletion of local sand reserves means that construction and concrete companies now have to transport sand via road from further away or turn increasingly to the production of manufactured sands from hard rock deposits which are more expensive to mine and more hard-wearing on plant and equipment,” Daniel explains.

“This is where CD&E waste processing plants come into their own. They accept waste feed from metropolitan areas and clean it to repurpose it back into the local construction market.”

At the same time, Daniel says there is limited room available for tailing ponds.   

“CDE’s world-leading water recovery and tailings treatment technologies are used to make dry tailings that can be transformed into marketable products themselves,” he adds.

Hand-in-hand with protecting the planet’s finite natural resources is protecting the Earth itself and minimising the carbon emissions associated with the industry.

Vitally, the innovative wet processing plant commissioned for Repurpose It by CDE enables the waste-to-resource business to reduce its carbon dioxide output by more than 84,000 tonnes per year, based on processing 500,000 tonnes of feed material.

“Our investment demonstrates our commitment to reducing the construction industry’s reliance on extractive resources and underpins our company values of creating value from waste,” George says.

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