JPH08108050A - Water treatment membrane module - Google Patents

Abstract

PURPOSE: To prevent a leak from a potting part and a flange part due to shrinkage or the like of the potting part by individually connecting permeated water from each unit membrane module to a concentrated pipe. CONSTITUTION: Unit membrane modules are supported in a module vessel 6 by fixed plates 4, 5. A water collecting pipe 7 having a tube joint 2 and an open end of the unit membrane module 1 having a tube joint 2 are connected by a tube 3. Raw water comes in from a raw water inlet 8 and is filtered by the unit membrane modules 1, and the permeated water is collected in the water collecting pipe 7 through the tube 3 and is discharged from a permeated water outlet 13. On the other hand, raw water which has not filtered by the unit membrane modules 1 is discharged from a raw water outlet 14. In case of an all filtration type, the raw water outlet 14 is closed and only the permeated water is discharged. When the water treatment membrane modules are used to filter turbid river water for 30 days while washed backward, clear water is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment membrane module having a permeated water discharge portion improved when clean water is obtained by filtering sewage or river water using a hollow fiber membrane.

[0002]

2. Description of the Related Art Conventionally, a hollow fiber membrane module used in a hollow fiber membrane type filter has a hollow fiber membrane arranged in the axial direction of a tubular container, and both ends or one end of the hollow fiber membrane are potting parts. It is fixed by (tube plate). Generally, sewage or river water (hereinafter referred to as raw water) that is subjected to a filtration treatment is supplied to the outside of the hollow fiber membrane through a raw water inlet, permeates from the outside to the inside of the hollow fiber membrane, is filtered, and is discharged outside the hollow fiber membrane. Suspension adheres to. Permeated water (hereinafter referred to as water permeation) passes through the hollow portion inside the hollow fiber membrane and is sent from the open end of the tube sheet to the water permeation outlet. A method of discharging water through a filter using a membrane module is disclosed in, for example, Japanese Unexamined Patent Publication No. 5-7740.
It is described that a module in which 0 and the rod 43 are bonded and fixed by the end member 36 is used, and the water permeation that has passed through the module is collectively guided to the water permeation outlet by using the space portion of the spacer 45 as a water collecting chamber.

[0003]

However, in the structure described in Japanese Patent Laid-Open No. 5-7740, the connection structure is such that the end portions of the hollow fiber bundle are connected to the end members 36, 31 and the holding plate 4. This is complicated, and therefore, when the module is increased in size, there is a problem that leakage prevention between the end member and the retainer plate becomes uncertain due to contraction of the end member or the potting member, and the connecting operation is complicated. The present invention aims to solve these problems.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a bundle of hollow fiber membranes (hereinafter referred to as a hollow fiber bundle) is bundled, and a plurality of membrane modules formed at both ends or one end are contained in one container. In the treatment membrane module, permeated water from each unit membrane module is individually connected to a water collection pipe, and relates to a water treatment membrane module, and a method of connecting to the water collection pipe is a simple joint or one-touch. The present invention also relates to a water treatment membrane module that is a joint and is provided in a water treatment membrane module whose water collection pipe is outside the water treatment membrane module container or inside the water treatment membrane module container.

[0005]

[Operation] Raw water is introduced from the raw water inlet to the outside of the hollow fiber membrane. The water permeation that has permeated into the hollow portion of the hollow fiber membrane is once collected in the water collection pipe through each tube connected by the tube joint from the open end of the tube sheet, and then discharged from the water permeation outlet. The shape, model, and operation method of this membrane module such as full filtration type or cross flow type can be appropriately selected. Furthermore, operations such as backwashing can be performed to extend the life of the membrane module.

[0006] When the adherence of the suspension on the outer surface of the hollow fiber membrane exceeds a certain amount, the filtration efficiency is lowered. Therefore, the adhered suspension can be removed by backwashing or hollow gas bubbling the hollow fiber membrane. In backwashing, for example, a backwashing liquid is introduced from a water permeation outlet and is allowed to flow back from the inside to the outside of the hollow fiber membrane to remove the suspension attached to the outer surface of the hollow fiber membrane. In gas bubbling, when the unit membrane module is filled with raw water,
A gas such as air is introduced from the raw water inlet and bubbled in the cylindrical container to vibrate the hollow fiber membrane bundle that constitutes the unit membrane module, and this vibration causes the suspension adhered to the outer surface of the hollow fiber membrane to be suspended. The gas is removed and discharged from the raw water outlet.

In the unit membrane module of the present invention, at least the open end, that is, one end on the water-permeable side is attached to the fixing plate (2) 5 as shown in FIG. 1, and the other end, that is, the sealing side is free. State or fixed plate (1) 4
It may be attached to. The material of the hollow fiber membranes constituting the unit membrane module is polypropylene, a polyolefin resin such as polyethylene, a polysulfone resin, a silicone resin, a polyvinylidene fluoride resin, a fluororesin such as a copolymer of ethylene and tetrafluoroethylene, or cellulose acetate. Resins are preferred. The peripheral wall forming the hollow fiber membrane is porous having a large number of fine pores, and the average pore diameter of the fine pores is preferably 0.01 to 1 μm. Further, the porosity of the hollow fiber membrane may be generally about 20 to 80%.

The fixing plate used in the present invention is disk-shaped or polygonal plate-shaped and does not need to be airtightly adhered to the module container, as long as each unit membrane module is favorably supported in the module container. . The material of the fixing plate is not particularly limited, but metals such as stainless steel and resins such as polyvinyl chloride are preferably used.

The water collecting pipe is preferably outside the module container, but may be inside the module container. Further, it is preferable that the water collecting pipes are arranged in the same circumference. For example, as shown in FIG. 1, the open ends of the unit membrane modules 1 are individually connected to the tube joints 2, and the water collecting pipes 7 are individually and independently provided in the same circumference with the tubes 3.
It is connected to.

The tube is made of a material having appropriate flexibility,
For example, polyvinyl chloride, silicone resin, urethane resin and the like are preferable in terms of attachment / detachment operation. The wall thickness of the tube is not particularly limited as long as it can withstand water pressure and pressure during backwashing.

[0011]

Embodiments will be described in detail below with reference to embodiments of the present invention. In the figure, the flow of water is indicated by an arrow.

Embodiment 1 FIG. 1 is a sectional view showing an embodiment of the water treatment membrane module of the present invention. In FIG. 1, a plurality of unit membrane modules in which the ends of a polypropylene hollow fiber membrane having an average pore diameter of 0.3 μm and a porosity of 70% are bundled are arranged in parallel in a cylindrical polyvinyl chloride container, and fixed plate 4 5 to support in the module container 6. The water collection pipe 7 having the tube joint 2 and the open end of the unit membrane module 1 having the tube joint 2 are connected by a tube 3. And the connection method of the water collection pipe 7 and the membrane module is a simple joint or a one-touch joint. The simple joint or the one-touch joint in the present invention means
The material is metal or plastic and has a tube insertion hole on one side, a removal ring, a lock ring, an edge, an O-ring, etc., and an O-ring, a stop ring, etc. on the other side, and the edge is a tube. It bites into the outer peripheral surface and is fixed. It is a commonly used joint that has characteristics that it can be adapted to the material of the tube to be connected, does not require a special tool for attachment and detachment, and that the screw upper body can be freely moved. For example, a touch connector Fuji, a one-touch joint [trade name, manufactured by Chiyoda Co., Ltd.], a one-touch joint [trade name, Nippon Pisco Co., Ltd.] and the like can be used.

Raw water enters through the raw water inlet 8, is filtered by the unit membrane module 1, and permeate passes through the tube 3 and collects in the water collecting pipe 7 and is discharged through the water permeating outlet 13. On the other hand, the raw water not filtered by the unit membrane module 1 is the raw water outlet 14
Emitted from. In the case of the full filtration type, the raw water outlet 14 is closed and only the permeated water is discharged. When the polluted river water was filtered for 30 days while backwashing using this water treatment membrane module, clear water permeation was obtained. 2 is shown in FIG.
9 is a cross-sectional view taken along the line A-A of FIG. 1 and shows an example in which the unit membrane module 1 has a total of 9 membrane modules, one in the center and eight in a concentric (circular) shape around the unit. And it is being fixed by the flange 15 and the pillar 16.

[0014]

By adopting the structure of the simple joint of the present invention,
When the structure is simplified and the membrane module is increased in size, it is possible to reliably prevent leakage between the potting portion and the flange portion due to contraction of the potting portion or the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a water treatment membrane module of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of the water treatment membrane module of the present invention.

[Explanation of symbols]

 1 unit membrane module 2 tube joint 3 tube 4 fixing plate (1) 5 fixing plate (2) 6 module container (outer cylinder) 7 water collection pipe 8 raw water inlet 9 holes 10 tube plate (open end) 11 tube plate (sealing) End) 12 Hollow fiber membrane bundle 13 Permeate outlet 14 Raw water outlet 15 Flange 16 Strut

Claims (4)

[Claims] 1. A water treatment membrane module in which a bundle of hollow fiber membranes are bundled and a plurality of membrane modules formed at both ends or one end are housed in one container, and permeated water from each unit membrane module is individually A water treatment membrane module that is independently connected to a water collection pipe. 2. The water treatment membrane module according to claim 1, wherein a simple joint or a one-touch joint is used for connection to the water collecting pipe. 3. The water treatment membrane module according to claim 1, wherein the water collection pipe is provided outside the water treatment membrane module container. 4. The water treatment membrane module according to claim 1, wherein the water collection pipe is provided inside the water treatment membrane module container.