- "By combining dry screening and washing, we get a solution that increases capacity and water efficiency. The result is a circular sand and stone product that can be reused in new infrastructure projects," says Daniel Carlberg, CEO of Norditek.
The new technology is scalable and cost-effective, making it suitable for implementation in more regions. The dry stage separates large rock and clay before washing, increasing capacity and reducing unnecessary water use - the clay does not need to be washed. In the next stage, all iron is removed before washing begins. The washing process itself removes the remaining silt, clay and impurities such as textiles, wood and plastics, leaving a final product of clean sand and stone completely free of impurities. The wash water is purified by sedimentation in a basin and then returned to the process, allowing up to 90% of the water to be reused.
- By washing and reusing contaminated excavated material instead of landfilling it, we can reduce the pressure on our landfills. At the same time, we increase the supply of reused aggregates, which is important for a resource-efficient future," says Tommy Ohlsson, Regional Manager at Ragn-Sells.
Despite technological advances, competing with the price of virgin aggregates remains a challenge, which the industry needs to address to accelerate the transition to more circular materials management.
- "In order for cities like Gothenburg to reach their ambitious target of 50% recycled aggregates by 2030, both the supply of and demand for recycled materials must increase," concludes Tommy Ohlsson.
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