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:
Jun. 27, 2000
Filed:
May. 09, 1997
Applicant:
Inventors:
Friedrich Wagner, Heuweiler, DE;
Hubert Wienands, Emmendingen, DE;
Assignee:
Wehrle-Werk AG, Emmendingen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210652 ; 210650 ; 210636 ; 210660 ; 210663 ; 2101952 ; 2102572 ;
Abstract
A process and apparatus for the purification of waste water includes a nano-filteration stage (19) which returns a stream of retained substance (20) in a cycle (15, 16, 17, 18) in order to effect a concentration of the content substances. Concentrate (29) is taken out of the cycle and is introduced into a physical and/or chemical treatment stage. At least a part of the treated concentrate (47) is returned into the cycle of the nano-filtration stage (19).