Process for the biological purification of waste water

US4500429A · kind A · utility

Assignee

• Linde GmbH · DE

Inventors

• Hans Reimann · Ebenhausen, DE
• Allen Frydman · Munich, DE
• Uwe Fuchs · Munich, DE

Key dates

• Filing date: Jan 19, 1984
• Grant date: Feb 19, 1985
• Expiry date: Jan 19, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S210/906
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A process and apparatus are provided for the biological purification of phosphate-containing wastewater, wherein the wastewater is treated, in the presence of activated sludge at least a portion of which is fixed on a carrier material. The process is conducted in at least one aerobic, an anaerobic, and optionally an anoxic zone, to thereby discharge a substantially phosphate-free wastewater stream. In order to attain a high purifying effect with low cost expenditure, the activated sludge is carried on a movable carrier. The carrier material is conveyed from the anaerobic zone, optionally through the anoxic zone, to the aerobic zone, and simultaneously a like amount of carrier material is returned from the aerobic zone, optionally through the anoxic zone, to the anaerobic zone. In this process, the activated sludge is enriched with phosphates, and a portion of the phosphate-enriched activated sludge is separated from the discharged effluent.