Method of decontaminating solid materials contaminated with heavy metals

US5849567A · kind A · utility

Assignee

• GSF FORSCHUNGSZENTRUM FUR UMWELT UND GESUNDHEIT GMBH · DE

Inventors

• Klaus Fischer · Speyer, DE
• Hans-Peter Bipp · Hersbruck, DE
• Peter Riemschneider · Eichenau, DE
• Antonius Kettrup · Bad Staffelstein, DE
• Dieter Bieniek · Unterschleißheim, DE

Key dates

• Filing date: Apr 28, 1997
• Grant date: Dec 15, 1998
• Expiry date: Apr 28, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S210/912
• WIPO field: Environmental technology
• WIPO sector: Chemistry

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.