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:
Jul. 05, 2011
Filed:
Nov. 10, 2009
Takaaki Tokutomi, Tokyo, JP;
Motoyuki Yoda, Tokyo, JP;
Takaaki Tokutomi, Tokyo, JP;
Motoyuki Yoda, Tokyo, JP;
Kurita Water Industries Ltd., Tokyo, JP;
Abstract
A method and apparatus of anaerobic treatment which makes it possible to prevent disintegration of granular sludge and perform high-load high-velocity anaerobic treatment stably even in the case where treatment is performed under conditions where the granular sludge is easily disintegrated. In a reaction tankwhich retains the granular sludge, nitric acid or nitrous acid is adjusted so that they have a certain concentration range. For example, nitric acid is added to the liquid to be treated by connecting the nitric acid addition pathto a midway point of the path of the liquid to be treatedwhich introduces the liquid to be treated to the reaction tank, and nitric acid is mixed with the liquid to be treated. By introducing nitric acids within the reaction tank, denitrifying bacteria etc. can multiply, and disintegration of the granules is prevented.