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:
Apr. 10, 2012
Filed:
Mar. 04, 2009
Hiroaki Ikebe, Narashino, JP;
Hiroaki Ikebe, Narashino, JP;
Toyo Engineering Corporation, Tokyo, JP;
Abstract
A method of treating a wastewater, containing the steps of: filtering a wastewater supplied into an activated sludge tank and biologically-treated therein, in a membrane module installed outside the activated sludge tank; chemical-cleaning the membrane module with a membrane-cleaning agent while the membrane module is disconnected from the activated sludge tank with a valve; and water-flushing off the substances contained in the wastewater that react with the membrane-cleaning agent and form hazardous substances and/or operation-inhibiting substances, or the membrane-cleaning agent remaining in the membrane module with water while the membrane module and the activated sludge tank are disconnected from each other by the valve, wherein the membrane-cleaning agent is prevented from contacting the substances contained in the wastewater that react with the membrane-cleaning agent and form hazardous substances and/or operation-inhibiting substances.