Method of decontaminating solid materials contaminated with heavy metals
AssigneeGSF-Forschungszentrum fur Umwelt und Gesundheit GmbH
InventorsKlaus Fischer, Hans-Peter Bipp, Peter Riemschneider, Antonius Kettrup, Dieter Bieniek
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Abstract
In a method for reducing the content of heavy metals of solid materials, particularly of soils, a 0.1-10% aqueous solution of chemically modified biomasses of waste and residue materials is applied to the solid material whereby the heavy metals are released and extracted from the solid material. The biomass solution residues remaining in the solid material after the heavy metal extraction procedure is rapidly biodegradable so that no objectionable traces remain in the solid materials or soils.
Claims12
A method for reducing the content of heavy metals in solid materials comprising the steps of subjecting a biomass consisting of at least one of molasses, succrose, peeling sludge, starch, whey powder and carbohydrate-containing residues to an oxydation digestion process to provide chemically modified biomasses, preparing a 0.1-10% aqueous solution of said chemically modified biomasses, and extracting heavy metals containing compounds from said solid materials using said aqueous solution of said chemically modified biomasses.
Dependencies are inferred from the claim text.