Heavy metal removal from soils and biosolids

The presence of heavy metal contamination in soils is a global problem that prevents the development and use of significant amounts of industrial and agricultural land. This project examines the operation of a pilot plant for the treatment of soils and sludges contaminated with heavy metals, with the aim of reducing the category of contamination to avoid the need for landfill disposal. This research follows from a previous HazWaste Fund project with the EPA, where Category A soils could be remediated using acid digestion and soil washing methods. This project attempts to improve extraction rates by examining solid phase chemistry using XRD/XRF spectroscopy pre- and post-treatment. Various additives will be investigated in order to optimise extraction efficiencies.