Process for purifying and reusing surfactant-containing waste waters

US5885459A · kind A · utility

Assignee

• Buck Werke GmbH & Co. · DE

Inventors

• Elke Lerche · Schwedt, DE
• Karin Kneist · Schwedt, DE
• Hartmut Rohbeck · Schwedt, DE
• Doris Hillemann · Gransee, DE
• Ralf Schwarz · Schwedt, DE

Key dates

• Filing date: Nov 25, 1996
• Grant date: Mar 23, 1999
• Expiry date: Nov 25, 2016

Classification

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

Abstract

Waste water from a laundry (1) is collected in a storage container (3), fluffs and textile sheddings are separated through filtering sieves (2). The volume of the container is set so that it may store the amount of waste water produced for example during two days. The waste water is supplied with a bio-reactor (4) that works in aerobic conditions. Air is lead into the bio-reactor (4) at its lower end (5), establishing aerobic conditions therein. The biologically considered water leaves the bio-reactor (4) at the top end (6) of the column-shaped bio-reactor (4) and is supplied to an active coal column that acts as an adsorber (7). The adsorptively purified water leaves the adsorber (7) packed with active coal through the duct (8), is collected in a storage container (9) and if required is returned through duct (10) to the laundry, if required after 5 to 20% fresh water are added.