The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 2001
Filed:
Jun. 21, 1999
Applicant:
Inventors:
Monica Hermans, Neuss, DE;
Ulrich Hermanns, Essen, DE;
Sigurd Schlegel, Moers, DE;
Andreas Stein, Duelmen, DE;
Assignee:
Messer Griesheim GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C02F 3/02 ;
U.S. Cl.
CPC ...
C02F 3/02 ;
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.