Process for the removal of heavy metals contained in wastewaters

US4664804A · kind A · utility

Assignee

• Linde GmbH · DE

Inventors

• Manfred Morper · Gauting, DE
• Allen Frydman · Munich, DE

Key dates

• Filing date: Nov 18, 1985
• Grant date: May 12, 1987
• Expiry date: Nov 18, 2005

Classification

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

Abstract

A process is provided for the removal of heavy metals from wastewater prior to being fed to a wastewater treatment installation, with anaerobic sludge to cause the anaerobic sludge to absorb heavy metals in the wastewater. Thus, the heavy metals depleted wastewaters can then be treated in a conventional treatment plant and thereafter, the resultant sludge can be directly employed for agricultural purposes without requiring further treatment to remove heavy metals therein. To effect the process a preferred reactor is made up of two parts, a cylindrical mixing tank and a superposed funnel-shaped sedimentation zone.