Exploitation of plastic wastes

US5402946A · kind A · utility

Assignee

• BASF SE

Inventors

• Thomas Geiger · Dießen, DE
• Rainer Roemer · Hemsbach, DE
• Helmut Seifert · Serba, DE
• Ulrich Traegner-Duehr · Trier, DE
• Ulrich Broeckel · Schifferstadt, DE
• Joachim Meyer · Frankenthal (Pfalz), DE
• Axel Griebel · Heidelberg, DE

Key dates

• Filing date: Sep 7, 1993
• Grant date: Apr 4, 1995
• Expiry date: Sep 7, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S241/38
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A process for exploiting plastic wastes arising in the production or further processing or after use of the plastic, by, in a sewage treatment plant, comminuting the plastic wastes then mixing them with a sewage sludge to which organic flocculants are added with or without the addition of further amounts of finely divided coal and/or ash, if appropriate, modifying the surface properties of the plastic with binders in such a way that it binds better into the sludge, filtering the pretreated sludge mixture, where the plastic can assume the properties of a filtration aid, i.e. the filtering residue is reduced, incinerating the resulting filter cake, where the plastic assumes the function of an additional energy source and depositing the ash for example in a sanitary landfill or exploiting it.