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. 12, 2008
Filed:
Aug. 01, 2006
Takaaki Tokutomi, Tokyo, JP;
Takaaki Tokutomi, Tokyo, JP;
Kurita Water Industries Ltd., Tokyo, JP;
Abstract
In treating water containing ammonium-nitrogen by a combination of a nitrification process and autotrophic denitrification bacteria, high efficiency denitrification treatment is achieved by providing adequate ratio between nitrite and ammonia in effluent of the nitrification process. Ammonium-nitrogen concentration of the raw water introduced to a nitrification reactor and the ammonium-nitrogen concentration of the nitrified liquid from the nitrification reactor is measured, and on the basis of the measurement, the flow volume for aeration by a blower would be controlled. From the difference in NH—N concentration between the influent and the effluent of the nitrification reactor, nitrite concentration A in the nitrified liquid is calculated, and ratio A/B of the nitrite concentration A with the ammonia concentration B in the nitrified liquid is calculated. The flow volume for aeration by the blower to the nitrification reactor is controlled such that the A/B becomes 1.1 or more, preferably from 1.1 to 2.0.