STP1123

    A Critical Review of the Effectiveness of Stabilization and Solidification of Hazardous Organic Wastes

    Published: Jan 1992


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    Abstract

    A critical review is presented on the stabilization/solidification (S/S) of hazardous organic wastes (WASTES). The literature on the S/S of WASTES with cementing agents containing expandable lattice clay binders modified by cation exchange with quaternary ammonium cations (MODIFIED CLAYS) suggests that hazardous organic waste constituents (ORGANICS) may form permanent chemical bonds preventing future releases of ORGANICS into the environment. This conclusion is compared with basic studies on the sorption of ORGANICS from aqueous solutions by soils and MODIFIED CLAYS. This latter literature would suggest that sorption of ORGANICS from aqueous solutions is an equilibrium process wherein the MODIFIED CLAYS buffer the concentration of ORGANICS in the equilibrium aqueous solution rather than a process forming permanent chemical bonds, thereby preventing the movement of ORGANICS into the environment. Often the buffered concentration of ORGANICS in the equilibrium aqueous solution is far in excess of drinking water standards and therefore S/S WASTES are not necessarily environmentally safe. Discussions are presented on difficulties in relating data on the sorption of ORGANICS by MODIFIED CLAYS to conclusions regarding possible retention of ORGANICS against releases to the environment. Overall considerations are then given to the practice of S/S of WASTES at treatment, storage, and disposal (TSD) facilities.

    Keywords:

    stabilization and solidification, hazardous organic wastes, quaternary ammonium modified clays, sorption and desorption equilibrium


    Author Information:

    Brown, RE
    Chief technical advisor, environmental manager, and environmental manager, State of Ohio, Hazardous Waste Facility Board, Columbus, OH

    Jindal, BS
    Chief technical advisor, environmental manager, and environmental manager, State of Ohio, Hazardous Waste Facility Board, Columbus, OH

    Bulzan, JD
    Chief technical advisor, environmental manager, and environmental manager, State of Ohio, Hazardous Waste Facility Board, Columbus, OH


    Paper ID: STP19540S

    Committee/Subcommittee: D34.91

    DOI: 10.1520/STP19540S


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