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:
May. 20, 2008
Filed:
Mar. 29, 2004
Method and apparatus for the methane fermentation treatment of wastewater containing sulfur compound
Kazumasa Kamachi, Tokyo, JP;
Yasuhiro Honma, Tokyo, JP;
Toshihiro Tanaka, Tokyo, JP;
Toshio Tsukamoto, Tokyo, JP;
Kazumasa Kamachi, Tokyo, JP;
Yasuhiro Honma, Tokyo, JP;
Toshihiro Tanaka, Tokyo, JP;
Toshio Tsukamoto, Tokyo, JP;
Ebara Corporation, Tokyo, JP;
Abstract
A method and apparatus for the anaerobic methane fermentation treatment of a wastewater containing a sulfur compound. An oxidizing agent is added to an organic wastewater to oxidize the sulfur compound contained therein to molecular sulfur before the anaerobic treatment step. The wastewater is then introduced into the anaerobic treatment step for the methane fermentation treatment thereof. The amount of the oxidizing agent to be added to the wastewater is controlled using as an indicator the concentration of the residual oxidizing agent in the water flowing into the anaerobic treatment step and/or the concentration of hydrogen sulfide in a biogas generated. The oxidizing agent may be ozone, hydrogen peroxide, sodium hypochlorite or a bromine based oxidizing agent. When the concentration of hydrogen sulfide in a biogas generated in the anaerobic treatment step is used as said indicator, the oxidizing agent may be suitably added such that the concentration of hydrogen sulfide is 3% or less.