Detoxifying Metal-Contaminated Solid Wastes by Induced Ion Exchange—A Theoretical Evaluation

by Arup K. Sengupta, Lehigh Univ, Bethlehem, PA, USA,

Document Type: Proceeding Paper

Part of: Environmental Engineering


The presence of minor amounts of insoluble heavy metal precipitates may render a large body of innocuous solids (say fly ash, soil, calcium carbonate or even biological sludge) potentially hazardous according to the present regulations. Selective removal of such heavy metal precipitates from the sludge by induced ion exchange (a) will yield the main body of the sludge innocuous and hence, typical non-hazardous solid wastes disposal programs can be applied; (b) will concentrate the heavy metals in the ion-exchange resins, and they may be recycled after regeneration with dilute acids. High regeneration efficiency of weak-acid cation-exchange resins makes them particularly suitable for this process. The article deals with the kinetic study of a basket type continuous stirred tank reactor utilizing selective ion-exchange resins.

Subject Headings: Heavy metals | Waste treatment | Solid wastes | Hazardous wastes | Sludge | Waste disposal | Recycling | Chemical wastes

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