Diverting C&D waste from landfill to produce new products

Mildura-based Waters Excavation has invested in a construction and demolition wash plant designed to recover valuable recycled sand and aggregates from concrete waste.

The 80 Tph wash plant, designed by wet processing expert CDE, is being used by the family-run business to produce a range of sand (0–2 mm, 0–4 mm) and aggregate (4–10 mm, 10–16 mm and 16 mm–oversize) products, which have been recovered from concrete waste.

The solution incorporates the EvoWash sand wash plant, AggMax modular logwasher, a feed hopper and stockpile conveyor.

The S20 Hopper meters feed to the plant, with a feed conveyer that includes an integrated magnet for steel recovery.

The high-frequency Infinity D1-63 pre-screen removes sand prior to the attrition process, with high-frequency screening action for maximum sand removal. The incorporation of the Infinity D1-43 screen dewaters organic and lightweight wastes from the attrition process, enabling the production of two sands.

CDE’s RotoMax logwasher can be used in the processing of a variety of materials including sand and gravel, crushed rock, construction and demolition waste material, and a range of mineral ores. The logwasher scrubs material for maximum attrition.

The incorporation of the AggMax modular logwasher upward flow function rejects lightweight contaminants, which are dewatered on the integrated trash screen. The Infinity H2-60 sizing screen separates the material into three washed aggregates and allows the removal of sand liberated by the RotoMax attrition process.

Fines are passed to the EvoWash, a high-frequency dewatering screen with hydro cyclone technology. This gives control of silt cut points, allowing production of high-value, in-spec product straight from the belt.

The solution is allowing the business to produce a range of five high-quality sand products to meet local demand, whilst also diverting waste from landfill.

According to the Director of Waters Excavation, Michael Waters, one of the plant’s main features is the ability to scrub aggregates of clay and float off lightweight contaminants such as leaves, sticks and light plastics.

“It’s been a real success,” he said. “I’m blown away with the level of contaminants we were able to remove from the waste stream and how clean the end products were.”