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:
Oct. 30, 2018
Filed:
Jul. 04, 2014
Degremont, Paris la Defense, FR;
Gildas Manic, Paris, FR;
Philippe Ginestet, Chateaufort, FR;
DEGREMONT, Paris la Defense, FR;
Abstract
A method for biologically denitrifying waste water, includes a nitrification-denitrification sequence followed, for a first fraction of water, by a post-denitrification step during which an electron donor is injected into the first fraction, while a second fraction of water passes through a bypass, then is mixed with the first fraction downstream of the post-denitrification step; the first fraction of waste water is subjected, during the post-denitrification, to a nearly complete denitrification so as to exit the step at a nitrate [N—NO] concentration less than 4 mg/L, to minimize nitrous oxide production. The bypass rate is determined based on: a measurement of the nitrate concentration of the water upstream of the post-denitrification, the desired nitrate concentration for the mixture of the two fractions downstream of the post-denitrification treatment, and the nitrate concentration of the first fraction at the outlet of the post-denitrification, before the mixing of the two fractions.