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. 18, 2012
Filed:
Aug. 27, 2004
Warren Thomas Johnson, New South Wales, AU;
Thomas William Beck, New South Wales, AU;
Fufang Zha, New South Wales, AU;
Huw Alexander Lazaredes, New South Wales, AU;
Zhiyi Cao, New South Wales, AU;
Warren Thomas Johnson, New South Wales, AU;
Thomas William Beck, New South Wales, AU;
Fufang Zha, New South Wales, AU;
Huw Alexander Lazaredes, New South Wales, AU;
Zhiyi Cao, New South Wales, AU;
Siemens Industry, Inc., Alpharetta, GA (US);
Abstract
A method of backwashing a membrane filtration module (), said module () including one or more membranes () located in a feed-containing vessel (), the membranes () having a permeable wall which is subjected to a filtration operation wherein feed containing contaminant matter is applied to one side of the membrane wall and filtrate is withdrawn from the other side of the membrane wall, the method including: removing liquid from the feed-containing vessel () until the level of liquid in the feed-containing vessel () falls to a first level (L) below an upper level of the membranes; suspending the filtration operation; performing a liquid backwash of the membrane wall until liquid level within the feed-containing vessel () rises to a second predetermined level (L) above said first level; aerating the membrane surface with gas bubbles to dislodge fouling materials therefrom; performing a sweep or drain down of the feed-containing vessel () to remove the liquid containing the dislodged contaminant matter; and recommencing the filtration operation.