JP2016107182A - Spiral type membrane element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral type membrane element where water treatment efficiency is hardly reduced even when water treatment is performed under high pressure conditions or the treatment of high temperature water is performed for a long time.SOLUTION: In a spiral type membrane element comprising: an element body where a separation membrane, a supply side flow passage material and a permeation side flow passage material are wound around a perforated center tube; an upstream side end member disposed at the upstream side of the element body; and a downstream side end member disposed at the downstream side of the element body, the upstream side end surface of the element body and the rib of the upstream side end member are joined.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spiral membrane element. Such a spiral membrane element is suitable for the production of ultrapure water, brine or desalination of seawater, etc., and from contamination that causes pollution such as dyed wastewater and electrodeposition paint wastewater. Alternatively, effective substances can be removed and recovered, contributing to the closure of wastewater. Moreover, it can be used for advanced treatments such as concentration of active ingredients in food applications and removal of harmful components in water purification and sewage applications. It can also be used for wastewater treatment in oil fields, shale gas fields, and the like.

  As a conventional spiral membrane element (hereinafter also simply referred to as “membrane element”), a sheet-like separation membrane and a permeate flow path material folded with a raw liquid flow path material sandwiched between them are used as a set of material groups. There is known one in which a plurality of sets of material groups are overlapped and wound around the outer peripheral surface of a perforated hollow tube (Patent Document 1).

  FIG. 1 is a partially cutaway perspective view of a conventional membrane element. The membrane element 1 has a structure in which a separation membrane unit including a separation membrane 2, a supply-side flow path material 6 and a permeation-side flow path material 3 is wound around a central tube 5. More specifically, an envelope-like membrane (bag-like membrane) is formed by overlaying the separation membrane 2 on both sides of the permeate-side flow path material 3 and adhering three sides, and the opening of the envelope-like membrane is centered. It is configured by being attached to the tube 5 and spirally wound around the outer peripheral surface of the central tube 5 together with the net-like (net-like) supply-side channel material 6. An upstream end member 10 such as a seal carrier is provided on the upstream side of the element body R, and a downstream end member 20 such as a telescope prevention member is provided on the downstream side.

  When the membrane element 1 is used, the supply liquid 7 is supplied from one end face side of the membrane element 1. The supplied supply liquid 7 flows along the supply-side flow path member 6 in a direction parallel to the axial direction of the central tube 5, and is discharged as a concentrated liquid 9 from the other end face side of the membrane element 1. Further, the permeated liquid 8 that has permeated through the separation membrane 2 in the process in which the supply liquid 7 flows along the supply-side flow path material 6 is centered from the opening 5a along the permeation-side flow path material 3 as shown by the broken line arrows in the figure. It flows into the inside of the pipe 5 and is discharged from the end of the central pipe 5.

  However, when water treatment is performed under high pressure conditions using a conventional membrane element, or when water treatment of high-temperature water (for example, water at 50 to 80 ° C.) is performed, there is a problem that water treatment efficiency gradually decreases. It was.

JP 10-137558 A

  An object of the present invention is to provide a membrane element in which the water treatment efficiency is not easily lowered even when water treatment is performed under high-pressure conditions or when high-temperature water treatment is performed for a long time.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above object can be achieved by the membrane element shown below, and have completed the present invention.

That is, the present invention includes an element body in which a separation membrane, a supply-side channel material and a permeate-side channel material are wound around a perforated central tube, an upstream end member provided on the upstream side of the element body, In the spiral membrane element having a downstream end member provided on the downstream side of the element body,
The present invention relates to a spiral membrane element, wherein an upstream end face of the element body and a rib of the upstream end member are joined.

  The present inventor examined the cause of the water treatment efficiency gradually lowering when water treatment was performed under high pressure conditions using a conventional membrane element or when high temperature water treatment was performed. An envelope membrane wound in a spiral shape (with a separation membrane superimposed on both sides of the permeate-side channel material and bonded on three sides) gradually shrinks due to pressure or heat applied during water treatment, and the end surface of the element body Has been found to be caused by the depression (the envelope-like film at the end of the element main body shrinks and warps inward). Further, it has been found that the depression of the end face of the element body becomes larger at the upstream end face where the pressure applied in the initial stage of the water treatment operation is larger. And this inventor discovered that the upstream end surface of an element main body can be prevented from sinking by joining the upstream end surface of an element main body, and the rib of an upstream end member.

  In the membrane element of the present invention, it is preferable that the downstream end face of the element body and the rib of the downstream end member are joined. Thereby, the downstream end surface of the element body can be prevented from being depressed.

  The upstream end surface of the element body has a concave portion in the outer circumferential direction from the center, the rib of the upstream end member has a convex portion, and the concave portion and the convex portion are joined. preferable. Further, the downstream end surface of the element body has a concave portion in the outer peripheral direction from the center, the rib of the downstream end member has a convex portion, and the concave portion and the convex portion are joined. It is preferable. Joining can be strengthened by joining the concave part and the convex part, and the depression of the end face of the element body can be more reliably prevented.

  The said recessed part and the said convex part may be joined by the adhesive agent, and may be joined by the hook structure or the male-female structure. Thereby, the depression of the end face of the element body can be prevented more reliably.

  In the membrane element of the present invention, the upstream end face of the element main body and the rib of the upstream end member are joined. Therefore, when water treatment was performed under high pressure conditions, or high temperature water treatment was performed for a long time. Even in this case, the upstream end face of the element body does not sink, and the water treatment efficiency is unlikely to decrease. Further, by joining the upstream end face of the element body and the rib of the upstream end member, it is possible to prevent the envelope film from being wound around the central tube, thereby further preventing the water treatment efficiency from being lowered. be able to.

It is a perspective view which shows an example of the conventional membrane element. It is a front view which shows an example of an upstream end member. It is a perspective view which shows an example of an element main body. It is a perspective view which shows another example of an element main body. It is a front view which shows an example of the upstream end member which has an attachment part in a rib. It is a perspective view which shows an example of an element main body and an upstream end member.

  Embodiments of the present invention will be described below. The membrane element of the present invention includes an element body in which a separation membrane, a supply-side channel material and a permeate-side channel material are wound around a perforated central tube, and an upstream end member provided on the upstream side of the element body And a downstream side end member provided on the downstream side of the element body.

  The element body can be manufactured by a known method using a known separation membrane, a supply-side channel material, a permeation-side channel material, a center tube, and the like.

  In the membrane element of the present invention, the upstream end face of the element body and the rib of the upstream end member are joined. The method of joining is not particularly limited, and examples thereof include a method of joining the upstream end face of the element body and the rib of the upstream end member using an adhesive. Specifically, the upstream end surface of the element body and the rib of the upstream end member can be joined by the following method.

  FIG. 2 is a front view showing an example of the upstream end member (seal carrier). The upstream end member 10 has a structure in which an outer annular portion 11 and an inner annular portion 12 are connected by a rib 13. The number of ribs 13 is not particularly limited. Further, the shape of the rib 13 is not particularly limited, and may be linear or curved.

  FIG. 3 is a perspective view showing an example of the element body. The upstream end member 10 is mounted by inserting the inner annular portion 12 into the central tube 5 on the upstream side of the element body R and fixing the outer annular portion 11 to the outer peripheral surface of the element body R. At that time, an adhesive is provided on the surface of the rib 13, and the surface of the rib 13 provided with the adhesive and the upstream end surface 14 of the element main body R are adhered to each other, whereby the upstream end surface 14 and the upstream of the element main body R are upstream. The rib 13 of the side end member 10 can be joined. By joining the upstream end face 14 and at least one rib 13, it is possible to prevent the upstream end face of the element body from being depressed. However, in order to prevent the depression more reliably, the diameter 2 is provided in the diametrical direction. It is preferable to join the ribs 13 and the upstream end surface 14, and it is more preferable to join all the ribs 13 and the upstream end surface 14. The upstream end face 14 and the rib 13 are preferably joined from the inside to the outside as much as possible. The adhesive to be used is not particularly limited, and examples thereof include acrylic adhesives, urethane adhesives, rubber adhesives, epoxy adhesives, and polyester adhesives.

  Further, as shown in FIG. 4, the upstream end surface 14 of the element body R is provided with a recess 15 in the outer peripheral direction from the center, and an upstream end member 10 having a convex-shaped rib 13 is used. The upstream end face 14 of the element main body R and the rib 13 of the upstream end member 10 may be joined by fitting the convex rib 13. The recess 15 can be formed using, for example, an ultrasonic cutter. The cross-sectional shape of the recess 15 is not particularly limited, and examples thereof include an arc shape, a triangle, a quadrangle, and a polygon. What is necessary is just to match the cross-sectional shape of the convex part of the rib 13 with the cross-sectional shape of the recessed part 15. FIG. The depth of the recess 15 is not particularly limited, but is usually about 25 to 75% of the lateral width of the adhesive portion of the envelope film. The recess 15 is preferably provided from the center to the outer peripheral edge as much as possible. The length of the convex portion of the rib 13 may be adjusted to the length of the concave portion 15. The number of the concave portions 15 is not particularly limited, and may be one, may be two or more, and may be matched with the number of the convex-shaped ribs 13. In order to more reliably prevent the upstream end face 14 of the element body R from being depressed, it is preferable to provide two recesses 15 on the diameter of the upstream end face 14. Moreover, it is more preferable to use the upstream end member 10 in which all the ribs 13 have a convex shape, and to fit all the ribs 13 into the recesses 15 provided on the upstream end surface 14. In addition, when fitting the convex-shaped rib 13 in the concave part 15, you may adhere | attach the concave part 15 and the convex-shaped rib 13 using an adhesive agent. The adhesive to be used is not particularly limited, and examples thereof include the adhesive.

  Further, instead of making the rib 13 of the upstream end member 10 into a convex shape, as shown in FIG. 5, a convex-shaped accessory 16 may be provided on the rib 13.

  Further, as shown in FIG. 6, the upstream end face 14 of the element main body R and the rib 13 of the upstream end member 10 are joined by a hook structure using a hook receiving-shaped recess 15 and a hook-shaped rib 13. May be. When two hook-receiving concave portions 15 are provided on the diameter of the upstream end surface 14, it is preferable that the directions of the two hook receivers are reversed. Accordingly, the two hook-shaped ribs 13 can be easily fitted into the two hook-receiving concave portions 15. Moreover, the recessed part 15 and the convex-shaped rib 13 may be joined by the male-female structure. Further, when the concave portion 15 and the convex-shaped rib 13 are joined by a hook structure or a male-female structure, the concave portion 15 and the convex-shaped rib 13 may be bonded using an adhesive.

  In the membrane element of the present invention, it is further preferable that the downstream end face of the element body and the rib of the downstream end member (telescope prevention material) are joined. The joining method is not particularly limited, and examples thereof include the same joining method as described above.

  The spiral type membrane element of the present invention is suitable for the production of ultrapure water, desalination of brackish water or seawater, etc., and it is included in the stains that cause pollution such as dyeing wastewater and electrodeposition paint wastewater. It can contribute to the closure of wastewater by removing and recovering contaminated sources or effective substances. Moreover, it can be used for advanced treatments such as concentration of active ingredients in food applications and removal of harmful components in water purification and sewage applications. It can also be used for wastewater treatment in oil fields, shale gas fields, and the like.

1: Spiral membrane element 2: Separation membrane 3: Permeate side channel material 5: Center tube 5a: Opening 6: Supply side channel material 7: Supply liquid 8: Permeate 9: Concentrate 10: Upstream end member 11: Outer ring part 12: Inner ring part 13: Rib 14: Upstream end face 15: Recess 16: Accessory 20: Downstream end member 21: Sealing part R: Element body A1: Axial direction

Claims (6)

The separation membrane, the supply side channel material and the permeation side channel material are wound around the perforated central tube, the upstream end member provided on the upstream side of the element body, and the downstream side of the element body. In a spiral membrane element having a downstream end member provided,
A spiral membrane element, wherein an upstream end face of the element body and a rib of the upstream end member are joined. The spiral membrane element according to claim 1, wherein the downstream end face of the element body and the rib of the downstream end member are joined. The upstream end surface of the element main body has a concave portion in the outer peripheral direction from the center, the rib of the upstream end member has a convex portion, and the concave portion and the convex portion are joined. 3. A spiral membrane element according to 1 or 2. The downstream end surface of the element body has a concave portion in the outer peripheral direction from the center, the rib of the downstream end member has a convex portion, and the concave portion and the convex portion are joined. 2. The spiral membrane element according to 2 or 3. The spiral-type membrane element according to claim 3 or 4, wherein the concave portion and the convex portion are joined by an adhesive. The spiral membrane element according to any one of claims 3 to 5, wherein the concave portion and the convex portion are joined by a hook structure or a male-female structure.

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