Patent ID: 7018533
Filing Date: 2006-03-28
Classification: B01D

Abstract:
1. A method of cleaning a membrane filtration module, the module comprising, an upper header, a lower header, and at least one membrane situated in a feed-containing vessel, wherein the membrane extends longitudinally between the upper header and the lower header, wherein a first end of the membrane is potted in the upper header, wherein a second end of the membrane is potted in the lower header, wherein the upper header and the lower header are vertically spaced, wherein at least one of the upper header and the lower header comprises at least one opening, and wherein the membrane comprises a permeable wall, the method comprising: a) applying a feed comprising at least one contaminant to a first side of the permeable wall and withdrawing a filtrate from a second side of the permeable wall and through a first vessel port; b) suspending applying the feed and withdrawing the filtrate; c) cleaning the permeable wall by applying a backwash, whereby the contaminant is dislodged from the permeable wall and into a liquid surrounding the membrane; d) sweeping the feed-containing vessel with feed in a direction substantially parallel to the membrane, whereby the liquid containing contaminant is removed through the opening and through a second vessel port; and e) recommencing applying the feed and withdrawing the filtrate.