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. 13, 2010
Filed:
Apr. 25, 2005
Hiroshi Hayashi, Saitama, JP;
Hitoshi Takeuchi, Saitama, JP;
Hajime Negishi, Saitama, JP;
Shigeyuki Tsuzaki, Kitamoto, JP;
Yoshio Aikawa, Kasukabe, JP;
Ayako Mimoto, Saitama, JP;
Shintaro Nakaya, Iwaki, JP;
Hiroshi Hayashi, Saitama, JP;
Hitoshi Takeuchi, Saitama, JP;
Hajime Negishi, Saitama, JP;
Shigeyuki Tsuzaki, Kitamoto, JP;
Yoshio Aikawa, Kasukabe, JP;
Ayako Mimoto, Saitama, JP;
Shintaro Nakaya, Iwaki, JP;
Mitsubishi Materials Corporation, Tokyo, JP;
Abstract
A reducing water purification material having a reducing iron-based precipitate selected from green rust, iron ferrite, reducing iron hydroxide, and a mixture thereof. A wastewater treatment process having steps of adding a reducing iron compound to wastewater, leading the wastewater to which the reducing iron compound is added to a reaction tank and forming a precipitate, separating the formed precipitate by a solid-liquid separation to obtain a sludge, and alkalinizing all or a portion of the separated sludge to form an alkaline sludge followed by returning to the reaction tank, wherein in the precipitation step, the wastewater to which the reducing iron compound is added and the alkaline sludge are mixed and are allowed to react in a non-oxidizing atmosphere under alkaline condition to form a reducing iron compound precipitate as the precipitate, thereby incorporating contaminants in the precipitate to remove the contaminants from the wastewater.