Patent · US Expired

Biological waste water purification process and device

US6280624A · kind A · utility

3Cited by

12References

10Claims

0Family size

Assignee

Messer Griesheim GmbH · DE

Inventors

Monica Hermans · Neuss, DE
Ulrich Hermanns · Essen, DE
Sigurd Schlegel · Moers, DE
Andreas Stein · Schneverdingen, DE

Key dates

Filing date	Jun 21, 1999
Grant date	Aug 28, 2001
Priority date	—
Expiry date	Jun 21, 2019

Classification

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

Abstract

Biological wastewater is purified in a sewage treatment plant having an activation tank of a depth greater than approximately 5 m per meter into which a feed of compressed air is fed. An oxygen-containing gas having an oxygen content is increased with respect to the air or pure oxygen and is fed to the mixed liquor in at least a part of the aerobic tank volume of the activation tank. The oxygen containing gas is fed until the total content of the gas in the mixed liquor based upon saturation value is below 150% before the mixed liquor is fed to a secondary clarification.

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