Methods of running and washing spiral wound membrane module

A method of washing 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 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;
• supplying a washing liquid containing a chemical having a function of separating contaminants or a bactericidal action from at least one opening end of said perforated hollow pipe;
• and
• discharging said washing liquid derived from the outer peripheral surface of said perforated hollow pipe from at least the outer peripheral portion of said spiral wound membrane element.

A method of running a spiral wound membrane module for dead-end filtration comprising a pressure vessel having a raw liquid inlet and one or a plurality of spiral wound membrane elements stored in said pressure vessel,

• 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 the outer peripheral side of said spiral wound membrane element through said raw water inlet of said pressure vessel;
• 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.

A method of washing a spiral wound membrane module comprising a pressure vessel and one or a plurality of spiral wound membrane elements stored in said pressure vessel,

• 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 from at least an outer peripheral side of said spiral wound membrane element;
• flowing raw liquid through the outer peripheral 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;
• removing the permeate liquid from at least one opening end of said perforated hollow pipe;
• supplying a washing liquid containing a chemical having a function of separating contaminants or a bactericidal action from at least one opening end of said perforated hollow pipe;
• and
• discharging said washing liquid derived from the outer peripheral surface of said perforated hollow pipe through at least the outer peripheral portion of said spiral wound membrane element for taking out said washing liquid from said pressure vessel.

A method of running a spiral wound membrane element,

• 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 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;
• and
• diffusing bubbles continuously or intermittently in a liquid coming into contact with the outer peripheral portion of said spiral membrane component.

A method of running a spiral wound membrane element,

• 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 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;
• and
• applying ultrasonic vibration continuously or intermittently to a liquid coming into contact with the outer peripheral portion of said spiral membrane component.

A method of running a spiral wound membrane module comprising a pressure vessel and one or a plurality of spiral wound membrane elements stored in said pressure vessel,

• 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 material 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 material,
• said method comprising steps of:
• supplying a raw liquid containing an amount of contaminants 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;
• and
• diffusing bubbles continuously or intermittently in a liquid stored in said pressure vessel.

A method of running a spiral wound membrane module comprising a pressure vessel and one or a plurality of spiral wound membrane elements stored in said pressure vessel,

• 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 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;
• and
• applying ultrasonic vibration continuously or intermittently to a liquid stored in said pressure vessel.

A method of running a spiral wound membrane element,

• 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 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;
• and
• stopping running for a prescribed time period and holding said spiral wound membrane element in a state dipped in a liquid for the prescribed time during a running period.

A method of running a spiral wound membrane module comprising a pressure vessel having a raw liquid inlet and one or a plurality of spiral wound membrane elements stored in said pressure vessel,

• 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 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;
• and
• stopping running for a prescribed time period and holding said spiral wound membrane module in a state sealing a liquid in said pressure vessel for the prescribed time period.