RELEASE OF TOXIC ELEMENTS FROM SOLIDIFIED WASTES - A MATHEMATICAL-MODEL

A mathematical model to predict the release of toxic elements immobilized in different cementitious matrices is presented. This model has been obtained on the basis of previous experiments carried out adopting a dynamic leaching test proposed by America Nuclear Society. During the tests lithium and bivalent copper have been used as tracer: different types of cementitious matrices anf lime-pozzolana mortars have been tested. To correlate the release of two toxic elements with the intrinsic properties of the matrix and the immobilized element system a statistical approach has been used. The final semiempirical model obtained has been very satisfactory for the prediction of contaminant loss from the immobilizing matrices.