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:
Mar. 24, 1992
Filed:
Sep. 21, 1990
Applicant:
Inventors:
Gerard Faup, Versailles, FR;
Jean-Marc Audic, Paris, FR;
Assignee:
Lyonnaise des Eaux, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210605 ; 210625 ; 210630 ; 210903 ; 210906 ;
Abstract
A method of treating water with activated sludge, comprising a process for depolluting said water including a stage in which carbon pollution is oxidized, a nitrification stage which may optionally be associated with a denitrification state and/or a dephosphating stage, and a sludge ageing process. The method further includes a sludge concentration stage, said stage being performed upstream from the sludge ageing stage, said concentration being performed by phase separation using compressed air, e.g. in a flotation tank (3), and the concentrated sludge being recycled via the sludge ageing stage.