Patent · US Expired

Process for the biological purification of waste water

US4517093A · kind A · utility

1Cited by

5References

7Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Gerhard Leistner · Schmitten, DE
Gerhard Muller · Grafing, DE
Gunther Sell · Norden, DE
Alexander Bauer · Rosenheim, DE

Key dates

Filing date	Sep 26, 1984
Grant date	May 14, 1985
Priority date	—
Expiry date	Sep 26, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W10/10
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

In a process for the biological purification of waste water by mixing a sludge-water mixture and air in an activation chamber charged continuously with waste water, activated sludge and air and from which an equivalent quantity of sludge-water mixture is discharged, the sludge-water mixture is guided along with the air in the activation chamber so as to define at least one loop shape motion. In a further embodiment of the process that part of the sludge-water mixture that does not continue its loop shape course is submitted to a biological after-reaction, preferably occurring in the activation chamber, while avoiding backmixing with the mixture in loop shape motion.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.