Spiral wound type membrane element, running method and washing method thereof

A method (A) for running a raw liquid filter system performing dead-end filtration, the system comprises:

• a housing, a generally cylindrical spiral membrane component generally having an outer perimeter defined by two ends of the spiral membrane component and a membrane peripheral surface extending between the two ends, the spiral membrane being disposed in the housing to allow raw liquid to flow through a space provided between the outermost peripheral surface of the membrane and the housing, wherein the spiral membrane component comprises:
• a perforated hollow pipe having at least one opening end for guiding permeate and having a peripheral surface, a plurality of envelope-like membranes each having an end disposed proximate to said peripheral surface of said perforated hollow pipe and each extending generally radially outwardly therefrom, the ends of adjacent membranes forming a plurality of envelope openings open to said perforated hollow pipe, the envelope openings substantially surrounding the entire peripheral surface of the perforated hollow pipe, and raw liquid passage forming members interposed between said plurality of envelope-like membranes, the raw liquid passage forming members being positioned to supply raw liquid, which enters the spiral membrane component through the membrane peripheral surface of the outer perimeter in a generally axial direction, which is generally perpendicular to the peripheral surface of the perforated hollow pipe, to the perforated hollow pipe, the method comprising the steps of,
• supplying raw liquid from at least the peripheral side of said spiral wound type membrane element to said membranes via said raw liquid passage forming members,
• guiding permeate generally radially inwardly through said membranes, and
• taking out permeate from at least one opening end of said perforated hollow pipe.

A method for washing a raw liquid filter system for performing dead-end filtration, the system comprises:

• a housing, a generally cylindrical spiral membrane component generally having an outer perimeter defined by two ends of the spiral membrane component and a membrane peripheral surface extending between the two ends, the spiral membrane being disposed in the housing to allow raw liquid to flow through a space provided between the outermost peripheral surface of the membrane and the housing, wherein the spiral membrane component comprises:
• a perforated hollow pipe having at least one opening end for guiding permeate and having a peripheral surface, a plurality of envelope-like membranes each having an end disposed proximate to said peripheral surface of said perforated hollow pipe and each extending generally radially outwardly from said perforated hollow pipe, the ends of adjacent membranes forming a plurality of envelope openings open to said perforated hollow pipe, the envelope openings substantially surrounding the entire peripheral surface of the perforated hollow pipe, and raw liquid passage forming members interposed between said plurality of envelope-like membranes, the raw liquid passage forming members being positioned to supply raw liquid, which enters the spiral membrane component through the membrane peripheral surface of the outer perimeter in a generally axial direction, which is generally perpendicular to the peripheral surface of the perforated hollow pipe, to the perforated hollow pipe, the method comprising the steps of,
• introducing a washing liquid from at least one opening end of said perforated hollow pipe, and
• discharging the washing liquid guided out from the peripheral surface of said perforated hollow pipe from at least the periphery of said spiral wound type membrane element.

A method for running a raw liquid filter system for performing dead-end filtration, the system comprises:

• a housing, a generally cylindrical spiral membrane component generally having an outer perimeter defined by two ends of the spiral membrane component and a membrane peripheral surface extending between the two ends, the spiral membrane being disposed in the housing to allow raw liquid to flow through a space provided between the outermost peripheral surface of the membrane and the housing, wherein the spiral membrane component comprises:
• a perforated hollow pipe having at least one opening end for guiding permeate and having a peripheral surface, a plurality of envelope-like membranes each having an end disposed proximate to said peripheral surface of said perforated hollow pipe and each extending generally radially outwardly from said perforated hollow pipe, the ends of adjacent membranes forming a plurality of envelope openings open to said perforated hollow pipe, the envelope openings substantially surrounding the entire peripheral surface of the perforated hollow pipe, and raw liquid passage forming members interposed between said plurality of envelope-like membranes, the raw liquid passage forming members being positioned to supply raw liquid, which enters the spiral membrane component through the membrane peripheral surface of the outer perimeter in a generally axial direction, which is generaslly perpendicular to the peripheral surface of the perforated hollow pipe, to the perforated hollow pipe, the method comprising the steps of,
• when running, supplying raw liquid from at least the peripheral side of said spiral wound type membrane element, and taking out permeate from at least one opening end of said perforated hollow pipe, and
• when washing, introducing permeate from at least one opening end of said perforated hollow pipe, and discharging the permeate guide out from the peripheral surface of said perforated hollow pipe from at least the periphery of said spiral wound type membrane element.

A method for running a raw liquid filter system for dead-end filtration comprising:

• a housing, a generally cylindrical spiral membrane component generally having an outer perimeter defined by two ends of the spiral membrane component and a membrane peripheral surface extending between the two ends, the spiral membrane being disposed in the housing to allow raw liquid to flow through a space provided between the outermost peripheral surface of the membrane and the housing, wherein said spiral wound type membrane element comprises a perforated hollow pipe having at least one opening end for guiding permeate and having a peripheral surface, a plurality of envelope-like membranes each having an end disposed proximate to said peripheral surface of said perforated hollow pipe and each extending generally radially outwardly therefrom, the ends of adjacent membranes forming a plurality of envelope openings open to said perforated hollow pipe, the envelope openings substantially surrounding the entire peripheral surface of the perforated hollow pipe, and a plurality of raw liquid passage forming members interposed between said plurality of envelope-like membranes, said raw liquid passage forming members being positioned to supply raw liquid, which enters the spiral membrane component through the membrane peripheral surface of the outer perimeter in a generally axial direction, which is generally perpendicular to the peripheral surface of the perforated hollow pipe, to the perforated hollow pipe, the method comprising the steps of:
• supplying raw liquid through said inlet of said vessel from at least the peripheral side of said spiral wound type membrane element to said membranes via said raw liquid passage forming members;
• guiding permeate generally radially inwardly through said membranes;
• and
• taking out permeate from at least one opening end of said perforated hollow pipe.

A method for washing a spiral wound type membrane module, wherein said spiral wound type membrane module comprising:

• a housing, a generally cylindrical spiral membrane component generally having an outer perimeter defined by two ends of the spiral membrane component and a membrane peripheral surface extending between the two ends, the spiral membrane being disposed in the housing to allow raw liquid to flow through a space provided between the outermost peripheral surface of the membrane and the housing, wherein said spiral wound type membrane element comprises a perforated hollow pipe having at least one opening end for guiding permeate and having a peripheral surface, a plurality of envelope-like membranes each having an end disposed proximate to a peripheral surface of said perforated hollow pipe and each extending generally radially outwardly therefrom, the ends of adjacent membranes forming a plurality of envelope openings open to said perforated hollow pipe, the envelope openings substantially surrounding the entire peripheral surface of the perforated hollow pipe, and a plurality of raw liquid passage forming members interposed between said plurality of envelope-like membranes, said raw liquid passage forming members being positioned to supply raw liquid, which enters the spiral membrane component through the membrane peripheral surface of the outer perimeter in a generally axial direction, which is generally perpendicular to the peripheral surface of the perforated hollow pipe, to the perforated hollow pipe, the method comprising the steps of:
• introducing a washing liquid from at least one opening end of said perforated hollow pipe;
• discharging the washing liquid guided out from the peripheral surface of said perforated hollow pipe from at least the periphery of said spiral wound type membrane element;
• and
• taking out the washing liquid from said continuous space through said outlet of said vessel.