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Expecting the Unexpected: As Featured in Waste Management Review

05 August 2019

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As featured in Waste Management Review

During an interview with Waste Management Review, our Business Development Executive Riccardo Wong highlighted the importance of a tailored approach to remediating contaminated spoils.

As Business Development Executive at CDEnviro, Riccardo Wong is passionate about topics spanning environmental remediation, landfill diversion and waste-to-energy.  

Riccardo spoke to WMR about how developments such as the West Gate Tunnel in Melbourne are meaning that safer and quicker processes such as non-destructive digging and hydro excavation are fast becoming popular. He explained to WMR that while these safer processes protect utilities, the downside is they produce a wet waste product. This wet waste is a lot more difficult to manage and control, particularly if the material is deemed contaminated.  “With increased works we are seeing increased volumes of excavated spoils generated in a wet or dry form depending on the method of excavation,” Riccardo explained.

The disposal of these spoils is made even more difficult when it is found to be contaminated – which is often the case for works happening in dense metropolitan areas. “Now that we’re heading into the cold and wetter months, a traditional reliance on letting wet material dry is becoming more challenging. This is exacerbated by higher rainfall, which also leads to increased risk of contaminants leaching into the environment if excavated waste is not properly disposed or treated." CDEnviro has for this reason looked at a proven treatment option for contaminated soils, helping companies recover reusable material such as sand and aggregates from these streams.

As a business, we are seeing a lot more contamination as it increases its scope of works in densely populated areas, including demolition activities for example, we see old fuel stations being demolished and having excavated materials with contaminants such as hydrocarbons removed from disused industrial sites or sites in the metropolitan area where there’s heavy traffic. During his interview, Riccardo explained that what sets CDEnviro apart is its extensive experience with processing different waste streams.  “Our technology needs to be robust enough to handle variability and material can come from anywhere and contain anything,” he said. “For example we have plants that are able to process both wet and dry contaminated spoils produced from different activities.”  Riccardo added that CDEnviro works with its customers to wash and recover as much clean sand and aggregates for reuse. “We recover sand and aggregates as reusable products which can be reused in low grade construction or put back on site. Contamination is pushed into the wastewater stream where it’s then treated.”

The recovered materials can be reused and offset the demand on virgin material. This reduces the need to travel hours out of the metropolitan area which has a financial and environmental cost attached to it. He says that in many cases, CDEnviro’s products are bespoke and the company co-develops a solution with its customers. “A lot of our work is being able to expect the unexpected in a way that provides a system which can deal with their capabilities.”


For more information on CDEnviro solutions for contaminated wastes, get in touch


We'll be continuing the conversation at the Australian Waste & Recycling Expo on 30th-31st October. If you're attending, make sure to arrange a meeting with us to see how valuable resources can be extracted from your waste. 



Waste Management Review Contaminated spoils Hydro excavation NDD