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. 04, 2003
Filed:
May. 07, 2001
Fanny Lefevre, Poissy, FR;
Philippe Caulet, Bailly, FR;
Bruno Bujon, Chatou, FR;
Jean-Pierre Philippe, Herblay, FR;
Suez Lyonnaise des Eaux, Nanterre Cedex, FR;
Abstract
A process is disclosed for regulating the aeration in a biological wastewater treatment plant using a carbon removal stage, a nitrification stage and a denitrification stage. The process includes the step of continuously measuring the value of oxidation-reduction potential of the treated medium as well as measuring oxygen concentration of the treated medium during aeration phases. This permits maintaining aeration if the oxygen concentration falls within a preselected reference range. Alternately there is reduction of the aeration if the oxygen concentration is above the preselected reference range, or increasing the aeration if the oxygen concentration falls below the preselected reference range. The process requires comparing the oxygen concentration in the treated medium with the preselected reference range during a transition of the oxidation-reduction potential (partial nitrification/total nitrification); and adjusting the reference range of oxygen concentration to a new set of values to correct the oxygen concentration toward a preselected desired level.