JPH03242230A - Hollow fiber filter module - Google Patents

Abstract

PURPOSE:To obtain a hollow fiber filter module having a large surface area of hollow fibers by dividing a bundle of hollow fibers into plural small bundles, arranging these bundles in a straight tube in a uniformly dispersed state and setting a bundle dispersing tube at the roots of the bundles fixed with a fixing member. CONSTITUTION:A hollow fiber filter module is composed essentially of a straight tube 1, a bent tube 2, a bundle 3 of hollow fibers, a bundle fixing member 4 and a bundle dispersing member 5. The bundle 3 is divided into plural small bundles, these bundles are arranged in the straight tube 1 in a uniformly dispersed state and the dispersing tube 5 nearly parallel to the tube 1 is set near the fixing member 4 at parts of the bundles exposed to the inside of the tube 1. The hollow fibers in the module can he kept in a dispersed state over a long period of time and a large surface area is ensured.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a hollow fiber filtration module in which hollow fibers are arranged approximately parallel to the straight pipe in which a fluid to be treated flows. The present invention relates to a hollow fiber filtration module equipped with a hollow fiber bundle dispersion tube for uniformly dispersing hollow fiber bundles in a straight pipe.

[Conventional technology]

Hollow fiber filtration membranes have an excellent filtration function and have a large membrane area that can be accommodated in a unit volume, so they are widely used in various applications.

Filtration methods using filtration membranes include a total filtration method in which the entire amount of the fluid to be treated is processed in a filtration module and recovered as purified fluid, and a cross-flow method in which the fluid to be treated is partially processed in the filtration module. The six-part filtration method, in which most of the remaining fluid to be treated is circulated, has the advantage of being able to filter at a controlled rate even when the concentration of suspended solids in the fluid to be treated is high. recently,
Various hollow fiber filtration modules using hollow fiber filtration membranes suitable for use in this method have been proposed.

For example, in JP-A No. 62-132503, hollow fibers bundled in a U-shape or the like are arranged in a straight pipe through which the water to be treated flows so as to be almost parallel to the flow of the water to be treated, and the outlet of the purified water is One end of the curved tube provided with a fixing member for fixing the open end of the hollow fiber is placed within the straight tube in a concentric circle with the straight tube, and the other end of the curved tube is inserted through the wall of the straight tube. Externally located hollow fiber filtration modules have been proposed. According to this module, the pressure loss of the water to be treated is small, damage to the hollow fibers is prevented, and a desired number of modules can be connected in series for use.

Problems to be Solved by the Invention] However, when this type of hollow fiber filtration module is used for partial filtration treatment, if the water to be treated contains impurities at a relatively high concentration, the outside of the hollow fibers There was a problem in that the hollow fibers easily adhered to each other due to impurities adhering to the surface, and the entire hollow fibers arranged in the module tended to form a bundle of rods. When such a bundle is formed, it is difficult for the water to be treated to enter the central part of the bundle, so that the effective membrane area of the hollow fiber filtration module decreases, resulting in a decrease in the filtration function. Furthermore, once a single bundle was formed, it became difficult to perform a function recovery process to eliminate clogging of the hollow fibers.

An object of the present invention is to provide a hollow fiber filtration module that can maintain the hollow fibers in the hollow fiber filtration module in a loose state with a large membrane surface area for as long as possible.

[Means for solving the problem] That is, the hollow fiber filtration module of the present invention includes a straight pipe,
A curved pipe whose one end is arranged concentrically with the straight pipe within the straight pipe and whose other end is located outside the straight pipe, and hollow fibers bundled in a U-shape arranged inside the straight pipe and/or one end of which is sealed. A hollow fiber filtration module comprising a bundle of hollow fibers and a fixing member that liquid-tightly fixes the open ends of the hollow fibers to the ends of the curved tubes while directing the open ends of the hollow fibers toward the inside of the curved tubes. A hollow fiber bundle dispersion tube divides the hollow fibers into bundles, uniformly disperses the small bundles within the straight pipe, and positions the exposed portion of the divided small bundles into the straight pipe approximately parallel to the straight pipe. It is characterized in that it is disposed near the fixing part by the fixing member.

[Function] Hereinafter, the hollow fiber filtration module of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a schematic sectional view showing an embodiment of the hollow fiber filtration module of the present invention, and FIG.
- It is a sectional view cut along the A line.

The hollow fiber filtration module of the present invention basically includes a straight pipe 1, a curved pipe 2, a hollow fiber bundle 3, a fixing member 4, and a hollow fiber bundle dispersion pipe 5. In addition to the parts,
Various auxiliary members may be attached.

The bent pipe 2 has one end located almost concentrically with the straight pipe 1 within the straight pipe 1 and serves as an outlet for purified water filtered by hollow fibers, and the other end penetrates the wall of the straight pipe and serves as an outlet for the purified water filtered by the hollow fibers. 1 and serves as an outlet for purified water. Although FIG. 1 shows an example in which the bent pipe 2 is bent by 90 degrees and comes out of the straight pipe 1, the angle formed by the straight pipe 1 and the bent pipe 2 can be freely selected. Further, the inner diameter of the curved pipe 2 may be partially different as shown in the figure. It is preferable that the bent pipe 2 is firmly fixed to the straight pipe 1. In FIG. However, the fixing means is not limited to this mode. It is preferable that this flange 8 is provided with a flow path having a sufficient area so that the water to be treated can freely flow. FIG. 3 is a plan view showing an example of such a flange 8. Although the straight pipe 1 is exemplified as having the same inner diameter over its entire length, it may have portions with different inner diameters, such as by adding a throttle or a baffle plate, as long as the pressure loss is not too large.

The hollow fiber bundle 3 is arranged in the straight pipe 1 almost parallel to the straight pipe 1, and the shape of the hollow fibers constituting the hollow fiber bundle 3 is U.
It is preferable to use a bundled bundle in a letter shape, but of course a linear bundle with one end closed can also be used. In addition, the material for the hollow fibers is preferably one that is flexible and can withstand external forces and chemicals during functional recovery operations for clogging of the hollow fiber filtration membrane. Examples of such hollow fibers include polyolefin, fluorine, etc. Examples include hollow fiber membranes for ultrafiltration or precision filtration made of materials such as polyolefin, polysulfone, and polyacrylonitrile.

This hollow fiber bundle 3 has its open end fixed by a fixing member 4 made by solidifying a botting agent such as polyurethane, epoxy resin, unsaturated polyester resin, silicone resin, etc. while keeping the open end of the hollow fiber in an open state. The surface is held fixed so as to be liquid-tight with the end of the curved pipe 2. The hollow fiber bundle 3 is directly fixed to the end of the curved pipe 2 (if a fixing means such as a flange is used, the opening of the fixing means connected to the opening of the curved pipe 2, hereinafter collectively referred to as the end of the curved pipe). Alternatively, it is convenient and preferable to fix the hollow fiber bundle 3 in advance to a tubular member that can be inserted into the end of the curved tube 2, and then insert and fix this into the end of the curved tube 2, since this is convenient for manufacturing the module.

The hollow fiber bundle distribution pipe 5 is disposed at the base of the hollow fiber bundle 3 to which the hollow fiber bundle 3 is fixed by the fixing member 4 . The hollow fiber bundle dispersing tube 5 divides the hollow fiber bundle arranged in the straight pipe into a plurality of small bundles, and distributes these small bundles so that they are not unevenly distributed in a part of the straight pipe, as shown in FIG. Any material can be used as long as it functions to uniformly distribute and arrange the hollow fiber bundles in the cross section of the straight pipe and position the hollow fiber bundles exposed from the hollow fiber bundle distribution pipe into the straight pipe almost parallel to the straight pipe. It may have such a shape. In the hollow fiber bundle dispersion tube 5 shown in FIG. The tip is bent so as to be parallel to the straight pipe l. The larger the number of small dispersion tubes 7, the more the hollow fiber bundle is divided into straight tubes 1.
The number of dispersing tubes is preferably about 5 to 200, more preferably about 14 to 50, since it is difficult to manufacture the module.

The cross-sectional shape of the dispersion tube is not particularly limited, although it is convenient to make it circular.

The length β of the hollow fiber bundle dispersion tube 5 in the straight pipe 1 (the length from the connection part to the fixing member to the tip of the dispersion tube) is preferably as short as possible from the viewpoint of the effective membrane area of the hollow fibers. Furthermore, at least some of the small dispersion tubes 7 extend from the fixed part of the hollow fiber bundle by the fixing member 4 toward the pipe wall of the straight pipe,
It is necessary to have a shape for dispersing hollow fiber bundles. By scattering small bundles of hollow fibers within the straight pipe, it is possible to prevent the hollow fiber bundles from being stuck together due to contaminants, and to extend the period in which the effective membrane area is large.

The cylindrical body 6 constituting the joint of the hollow fiber bundle dispersion tube 5 to the fixing member 4 is embedded in the fixing member 4 in this example, but it may also be fixed by fitting into the curved pipe 2, for example. .

The hollow fiber bundle dispersion tube 5 only needs to have enough rigidity to fix the position of the small bundle of hollow fibers to some extent, and can be easily manufactured from plastic such as hard PVC, but metal with excellent corrosion resistance can also be used. .

The length of the portion of the straight pipe 1 where no hollow fibers are present is preferably as short as possible from the viewpoint of space efficiency.

In the hollow fiber filtration module of the present invention, water to be treated is introduced from the left side of the straight pipe 1, and purified water filtered by the hollow fiber filtration membrane is taken out from the end of the bent pipe 2 through the inside of the hollow fiber. Ru. On the other hand, most of the unfiltered water to be treated is taken out from the right side of the straight pipe 1 and supplied to the next hollow fiber filtration module connected in series, or is circulated and treated. In this way, most of the water to be treated flows along straight pipes, so
The pressure loss of the water to be treated within the module is extremely small.

Furthermore, even when performing recovery treatments for the filtration function of various modules such as chemical treatment and bubble contact treatment, the entire hollow fibers within the module are not integrated, making it easier for the chemical liquid and bubbles to come into contact with each hollow fiber. Therefore, the function recovery process can be performed more efficiently and in a shorter time.

The hollow fiber filtration module of the present invention can be used for drinking water, industrial water,
Filtration of various types of water such as medical water, ultrapure water, pyrogen-free water, polishing wastewater, oil-containing wastewater, flocculation treated water, chelate reaction treated water, biologically treated water, turbid water, metal-containing powder wastewater, degreasing liquid,
It can be suitably used for the filtration of SS-containing solvents, the filtration and recovery of valuable metal powders such as gold and silver, and flocs, and the recovery of valuable liquids in the food and pharmaceutical industries.

[Effects of the Invention] The hollow fiber filtration module of the present invention is provided with a hollow fiber bundle dispersion tube, in which the hollow fibers are physically separated into small bundles according to the number of small distribution tubes, and small bundles are arranged in the straight pipe. Because the bundles are arranged in a uniformly scattered manner, even when used for treated water with a relatively high concentration of pollutants, the entire hollow fibers in the module are difficult to integrate into a single rod shape, and can be used for a relatively long period of time. The effective membrane area of the hollow fibers within the module is maintained in a large state, making it possible to extend the useful life of the module. Furthermore, since it is difficult to integrate the entire hollow system within the module, it has become easier to efficiently perform function recovery processing to eliminate clogging of the module.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the hollow fiber filtration module of the present invention, and FIG. 2 is a cross-sectional view of the module shown in FIG.
A cross-sectional view taken along line A, and FIG. 3 is a plan view of the flange. 1. Straight pipe 3: Hollow fiber bundle 5: Hollow fiber bundle dispersion pipe 7: Dispersion small pipe 2: Bent pipe 4: Fixing member 6: Cylindrical body 8: Flange

Claims (1)

[Claims] 1) A straight pipe, a curved pipe whose one end is arranged concentrically with the straight pipe within the straight pipe and whose other end is located outside the straight pipe, and hollow fibers bundled in a U-shape arranged inside the straight pipe. or a hollow fiber filtration module comprising a bundle of hollow fibers with one end sealed, and a fixing member that liquid-tightly fixes the open ends of the hollow fibers to the ends of the curved tubes while directing the open ends of the hollow fibers toward the inside of the curved tubes. Hollow fiber bundle dispersion in which a fiber bundle is divided into a plurality of small bundles, the small bundles are uniformly distributed within a straight pipe, and the exposed portion of the divided small bundles into the straight pipe is positioned approximately parallel to the straight pipe. 1. A hollow fiber filtration module, characterized in that the tube is disposed near a portion fixed by a hollow fiber fixing member.