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:
Feb. 13, 2007
Filed:
Oct. 01, 2002
Harald Kraft, Oberkirch-Nussbach, DE;
Hans-thomas Armbruster, Ahcern-Grossweier, DE;
Wendelin Benz, Oberkirch-Zusenhofen, DE;
Harald Kraft, Oberkirch-Nussbach, DE;
Hans-Thomas Armbruster, Ahcern-Grossweier, DE;
Wendelin Benz, Oberkirch-Zusenhofen, DE;
Papierfabarik August Koehler AG, Oberkirch, DE;
Abstract
The invention relates to a method for purifying wastewaters, particularly wastewaters produced in the paper industry, involving the following steps: a) aerobic clarification of the wastewater using activated sludge in an activation stage; b) carrying out, in a secondary settling tank, a subsequent clarification of a portion of the wastewater/activated sludge mixture leaving the activation stage; c) desiccating, in a desiccation unit, another portion of the wastewater/activated sludge mixture leaving the activation stage; d) returning at least a portion of the activated sludge removed in steps b) and c) into the activated sludge tank.