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US Patent 7988866 Method of treating fumed silica-containing drainage water

Patent 7988866 was granted and assigned to Tokuyama Corporation on August, 2011 by the United States Patent and Trademark Office.

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Patent attributes

Current Assignee
‌
Tokuyama Corporation
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7988866
Date of Patent
August 2, 2011
Patent Application Number
11990739
Date Filed
August 17, 2006
Patent Primary Examiner
‌
Peter A. Hruskoci
Patent abstract

In a process for treatment of powdery fumed silica, fumed silica to be discarded is collected by dispersing the fumed silica in water. Disclosed is a method for treatment of a fumed silica-containing wastewater collected in the process. The method comprises the steps of: adding an inorganic coagulant containing a metal to a fumed silica-containing wastewater in an amount of 15 to 300 mg/l. in terms of the metal, wherein the wastewater is either a wastewater containing fumed silica at a concentration of 0.05 to 3.0% by mass or a wastewater whose fumed silica content is adjusted to 0.05 to 3.0% by mass; and adding an organic polymeric coagulant to the mixture.

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