Posted: Thursday 12th December 2013

According to Siltbuster, leading waste treatment specialists, the newly published revised edition of the Waste and Resources Action Programme (WRAP) Protocol on the recovery of Aggregates from Waste is a major development for water utilities, as it means they can now recycle the bulk of the sand and grit recovered from their wastewater treatment works decreasing the need for sending it to landfill.

The recent announcement by WRAP, states that the mineral fraction recovered by Mechanical and/or Biological Treatment (MBT) can now be used as feed stock for aggregate recycling, therefore allowing recovered material to be removed from the waste chain for the first time and achieve ‘End of Waste Status’.

The change stems from the allowance of the mineral fraction recovered by mechanical and/or biological treatment (MBT) (European Waste Code 19-12-09) be used as feed stock for aggregate recycling. To enable recovery by this route, the mineral fraction of stones, grit and sand must be put through an MBT process designed to produce a product that is substantially free from the organics and other contaminants.

“Simply screening the material without further treatment will not achieve the required separation,” Dr. Coulton said: “The material must be put through a washing system, such as Siltbuster’s Gritbuster, which is specifically designed to separate the components on both size and density. Following separation, the material can then be transferred in accordance with the Duty of Care Regulations for aggregates recovery or further processed on site under a suitable Quality Protocol and sold as aggregate.”

He concluded: “Whilst achieving end of waste status for the recovered aggregates will potentially involve additional processing costs this change should result in a significant saving for utility companies through reduced landfill gate fees and associated tax.”

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April 2021

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