Modelling of Chromium Behaviour and Transport at Sites Contaminated with Chromite ore Processing Residue: Implications For Remediation Methods.

The article focuses on the modelling of chromium behaviour and transport at sites contaminated with chromite ore processing residue. The presence of approximately 2.5 million tonnes of chromite ore processing residue on several sites in the vicinity of Glasgow has led to concern about the leaching of the known toxin, Cr(VI), into surface and ground waters and ultimately, into the River Clyde. Examination of the modelled mineralogical composition as a function of pH shows that the hydrogarnet dissolves first followed by the hydrocalumite in the pH range 11.5-10.5.