Process for treating waste water

US5445741A · kind A · utility

Assignee

• Solvay Deutschland GmbH · DE

Inventors

• Wolfgang Dilla · Rheinberg, DE
• Helmut Dillenburg · Rheinberg, DE
• Michael Klumpe · Rheinberg, DE
• Hans-Georg Krebber · Rheinberg, DE
• Horst Linke · Rheinberg, DE
• Detlef Orzol · Gladbeck, DE
• Erich Ploenissen · Rheinberg, DE

Key dates

• Filing date: Dec 23, 1993
• Grant date: Aug 29, 1995
• Expiry date: Dec 23, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S210/908
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for decreasing the content of organic-chemical substances in waste water by chemical oxidation, preferably in the presence of chlorine, and optionally additional alkaline thermal treatment of the waste water, in which the waste water, which has a COD content (chemical oxygen demand) and is alkaline or is rendered alkaline, is introduced into at least one reactor and is treated at a temperature of more than 15.degree. C. with a chlorine-containing and/or chlorine-releasing chemical substance, the introduction of chlorine taking place in a quantity of more than 1 g chlorine/g COD (relative to the chlorine content of the chlorine-containing and/or chlorine-releasing chemical substance), and a molar ratio of OH.sup.- to chlorine of more than 1.5 and a pH value of the waste water of .gtoreq.5 being maintained or set, and the resulting chlorine-treated, hypochlorite-containing waste water is subjected to a reaction time of more than 0.25 hours, with the organic compounds being at least partially oxidized, and subsequently the waste water is treated further and/or is discharged or drained from the reactor.