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Title
Verfahren zur Reinigung von Abwasser
Date Issued
2001
Author(s)
Patent No
1999-19953249
Abstract
Die vorliegende Erfindung betrifft ein verbessertes Verfahren zur Klaerung von kommunalem Abwasser.
WO 200132565 A UPAB: 20010625 NOVELTY - In a process for purifying sewage by carrying out a biological purification stage and a denitrification stage, the oxygen charge of the sewage in the denitrification stage is reduced. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for sewage plant, especially for carrying out this process. USE - The process is used for purifying sewage (claimed). ADVANTAGE - Filamentous microorganisms interfere with mechanical-biological treatment by the activated sludge process, mainly because they cause frothing and hence inhibit sedimentation. Reducing the oxygen level in the denitrification stage prevents massive occurrence of these microorganisms.
Language
de
Patenprio
DE 1999-19953249 A: 19991104