Stabilization of hazardous inorganic waste in cement : physical properties, evaluation and leaching experiments in static and dynamic conditions
To prevent the risk of contamination of the biosphere by hazardous and toxic industrial waste, confinement in an appropriate matrix is widely used. Solidification of a hazardous waste mixture containing As(2)O(3), CrCl(3), K(2)CrO(4), CdCl(2), HgO and Pb(No(3)) compounds in Ordinary Portland Cement (OPC) has been investigated. The resistance to water action of hazardous and toxic waste immobilized in a cement matrix has been tested under two extreme leaching procedures i.e. in static and in dynamic (5mL/min) water conditions. Even in dynamic water conditions, the metal concentration of As(III), Cr(VI) and Pb(II) are much below the permissible limits reported for EPA drinking water quality. The release of heavy metals in dynamic water tests increased in the following order: Hg(2+) > Pb(2+) > Cd(2+). The amount of waste incorporated in cement presents no adverse effect on the matrix durability measured by the release of calcium which is a matrix constituent. The results indicate that cement is a favourable confinement matrix for the solidification of As, Cd, Cr, metals.
Bibliographic Reference: Paper presented: V Conferenza Internazionale Gestione Rifiuti Industriali Roma (IT), April 26-29, 1989.
Availability: Available from (1) as Paper EN 34727 ORA
Record Number: 198910549 / Last updated on: 1994-12-01
Original language: en
Available languages: en