Summary

Giving The Environment Agency an accurate measure of levels of incinerator bottom ash aggregate (IBAA) and pulverised-fuel ash (PFA) in surface and ground water.

6 partners working with TRL and The Environment Agency
All trial objectives met
Data provided for accurate risk assessments

The Challenge

The Environment Agency had data from laboratory leaching tests but needed to check how accurately they reflected field conditions. Six partners funded the work along with The Environment Agency, through the EU Life and EQual bodies. Joint industry and regulator steering groups would monitor the field trials.

Our approach

We worked in a consortium to lead the design and construction of the trials. The TRL team drew on our experience of trials of recycled and secondary materials in a range of applications. We adapted best practice from engineering performance tests.

'I’m really pleased the trials were such a success – many thanks for the positive approach throughout'
Sue Hornby, Senior Advisor - Environment Agency

The results

Using specialist instruments, we recorded water content, suction and drainage flow in the designated locations. Regular samples were analysed by the National Laboratory Service. The Environment Agency now has complete data to assess the leaching behaviour of these materials. It contributes to their risk assessments for the use of IBAA and PFA. 

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