title: Stabilization of a chromium-containing solid waste: immobilization of hexavalent chromium
abstract: This article describes the stabilization/solidification (S/S) of a steel industry waste, using a common type-F fly ash from a coal power station as the main binder. The waste, which contains hazardous levels of metals, may be stabilized by a conventional S/S to achieve permissible Pb, Cd, and Zn concentrations in the Toxicity Characteristic Leaching Procedure (TCLP) leachates of S/S solids. On the other hand, the stabilization of Cr(VI), also present in the waste, requires a reducing pretreatment stage with ferrous sulfate to attain TCLP leachates within limits. A bibliographic study on the stabilization of Cr(VI)-containing wastes is included in the paper, along with a discussion on the lowest Cr concentration in TCLP and aqueous (DIN) leachates.
authors.affiliation: Departamento de Ingenieria Quimica y Ambiental, Universidad de Sevilla, Spain.
authors.initials: M
authors.lastname: Rodriguez-Pinero
authors.lastname: Fernandez Pereira C
authors.lastname: de Elvira Francoy CR
authors.lastname: Vale Parapar JF