Heavy metal contamination is commonly encountered on brownfield sites. Lead is ubiquitous at such sites, and is typically the primary metal contaminant of concern.
TRAPPS™ treatment of Pb contaminated soil or made ground at brownfield sites is a very effective remedial option. Treatment can be carried out either in-situ or ex-situ utilising standard, readily available mixing equipment. TRAPPS™ is easy to apply, requiring only a thorough, homogenous mixing of the soil and TRAPPS™ additive.
A key difference between TRAPPS™ and cement stabilisation is that soil is physically unaltered after TRAPPS™ treatment. This allows for TRAPPS™ treated material to be reused on-site in landscaping applications.
An urban site in the UK was contaminated with a range of heavy metals including lead. Total metal concentrations were 1850mg.kg-1 Pb, 55mg.kg-1 Cd and 2100mg.kg-1 Cr. The preferred remedial option was to treat the contaminated soil in-situ and retain the stabilised material on site for reuse.
TRAPPS™ demonstrated that this was possible. After TRAPPS™ treatment the levels of leachable metal in soil porewater were significantly reduced (to below drinking water standards).
