Patent ID: 6432310
Filing Date: 2002-08-13
Classification: B01D

Abstract:
A method of running a spiral wound membrane element for dead-end filtration,said spiral wound membrane element comprising a spiral membrane component including a perforated hollow pipe, a plurality of independent or continuous envelope-like membranes wound around the outer peripheral surface of said perforated hollow pipe and a raw liquid passage forming member interposed between said plurality of envelope-like membranes, a liquid-permeable membrane covering the outer peripheral portion of said spiral membrane component and an outer peripheral passage forming member entirely or partially covering the outer peripheral surface of said liquid-permeable membrane, said method comprising steps of: supplying a raw liquid containing an amount of contaminants and a chemical having a function of separating contaminants or a bactericidal action, from at least an outer peripheral side of said spiral wound membrane element; flowing the raw liquid through the outer peripheral passage forming member to the outer peripheral portion of the spiral membrane component; separating contaminants from the raw liquid with the spiral membrane component by dead-end filtration, thereby producing a captured contaminants component and a permeate liquid; routing the permeate liquid from the spiral membrane component to the perforated hollow pipe; and removing the permeate liquid from at least one opening end of said perforated hollow pipe.