Protection of Groundwater by Immobilization of Heavy Metals in Industrial Waste Impacted Soil Systems

摘要

Immobilization processes in soil/waste systems impacted by hazardous wastes containing heavy metals were investigated. Samples of contaminated material (soil and/or waste) from nine sites in the Intermountain West and California included milling, electroplating, cement kiln dust, petroleum, and tailing and waste rock from mining operations. A sequential extraction procedure, originally developed to fractionate metals in sludge amended soils into water soluble, mobile, and plant available forms, was used to obtain preliminary identification of the leachable metal fraction for the hazardous waste contaminated soils studied. Sorption kinetics and batch sorption/desorption studies were performed to determine the interaction of Cu and Cd, from an acidic leachate of a mine waste, with calcareous soils. Solid phase diagrams, exchange models and GEOCHEM were used to define the mechanisms of metal attenuation of these soils.