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:
Sep. 23, 2008
Filed:
Jul. 15, 2004
Kazumasa Kamachi, Tokyo, JP;
Yasuhiro Honma, Tokyo, JP;
Toshihiro Tanaka, Tokyo, JP;
Yuji Tsukamoto, Tokyo, JP;
Kazumasa Kamachi, Tokyo, JP;
Yasuhiro Honma, Tokyo, JP;
Toshihiro Tanaka, Tokyo, JP;
Yuji Tsukamoto, Tokyo, JP;
Ebara Corporation, Tokyo, JP;
Abstract
An object of the present invention is to provide a process for a high-performance upflow anaerobic sludge treatment (methane fermentation treatment) targeting an organic wastewater containing an inorganic sulfur compound and an apparatus therefor. The invention relates to a process for methane fermentation treatment of an organic wastewater containing a sulfur compound, which includes: detecting a concentration of hydrogen sulfide in a biogas generated from a step of methane fermentation treatment; and, conducting a control of subjecting the organic wastewater to a desulfurization treatment operation in the case that the concentration of hydrogen sulfide in the biogas exceeds a predetermined value, and to an apparatus therefor. It is preferred that the predetermined value of the concentration of hydrogen sulfide is from 1 to 4%, preferably from 1% to 2%, and the desulfurization treatment operation comprises adding a desulfurizing agent containing an iron ion so that a molar ratio of the iron ion to sulfur is from 0.05 to 1.