JPH024328B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a hollow fiber filtration module for fluid filtration and a filtration system using the same. The present invention relates to a hollow fiber filtration module suitable for removing substances, etc., and a filtration system using the same.

[Prior Art] Hollow fiber filtration membranes have an excellent filtration function and have been widely used for various purposes including the production of high-purity industrial water and gas filtration.

There are two types of hollow fiber filtration modules: one that filters from the hollow part of the hollow fiber to the outside, and one that filters from the outside of the hollow fiber to the hollow part, but the former is based on the passage resistance inside the hollow fiber. is large,
Further, since suspended substances remain in the hollow portion of the hollow fiber and tend to cause clogging, the latter type has been often used for these applications.

[Problems to be solved by the invention] Most of these modules have a hollow fiber housed in a straight pipe, and the inlet and outlet for the fluid to be treated are provided on the side of the straight pipe. When used in combination, the flow of the fluid to be treated must be connected in a complicated manner, resulting in a large pressure loss of the fluid to be treated, requiring more pumping capacity than necessary, or limiting the number of connections. There were inconveniences such as high energy loss and high energy loss.

An object of the present invention is to provide a hollow fiber filtration module and a filtration system using the same, which has a completely new structure that solves the above-mentioned problems and can be used in industrial fluid processing.

[Means for Solving the Problems] That is, the gist of the present invention is to house a hollow fiber bundle bundled in a U-shape in a housing consisting of a straight pipe having a side pipe, and to keep the openings of the hollow fibers in an open state. There is a hollow fiber filtration module in which a bundle of hollow fibers, which is fixed to the end of the side tube, is present in the side tube section and a part of the straight tube section.
Furthermore, a plurality of modules are connected in series through the ends of each straight pipe, and one end of the serially connected module row has an inlet for the fluid to be treated, and the other end has an outlet for the fluid to be treated. The filtration system is provided with a side tube outlet of each module as a filtrate fluid outlet.

Instead of the U-shaped hollow fiber bundle of the hollow fiber module described above, a hollow fiber bundle may be used in which one end of the hollow fibers is kept open and the other end is closed.

[PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION] Hereinafter, the hollow fiber filtration module of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially cutaway schematic plan view showing one embodiment of the hollow fiber filtration module of the present invention, and FIGS. 2 and 3 are embodiments of a filtration system formed by connecting the hollow fiber filtration modules in series. It is a sectional view (hollow fiber filtration membrane not shown) showing the main part of an example. In the figure, the angle of the side pipe 2 of the straight pipe 1 having a side pipe is preferably 10 to 90 degrees. This angle is the angle of the part that joins with the straight pipe, and the side pipe may be straight or appropriately curved at its tip. Further, the straight pipe having the side pipe may be integrally molded, or may be formed by joining an elbowed pipe and a straight pipe. Further, the diameter of the straight pipe portion may be the same throughout, or may be connected to pipes of different diameters along the way. In this case, considering that a plurality of modules are connected in series, it is preferable that the diameters of both ends of the modules are the same. Of course, it is clear that even if the diameters do not match, it is possible to connect by devising the shape of the joint. Note that the joining portion between the straight tube and the side tube is preferably smooth so as not to damage the hollow fibers, and this portion may be tapered. or,
A restriction may be inserted in the straight pipe in order to retain the hollow fibers or locally increase the flow velocity, as long as the pressure loss is not too large.

There may be two or more side pipes for one straight pipe. In this case, the mutual positions of the side tubes are not limited in any way; for example, the side tubes may be arranged on one circumference of the straight tube or arranged in a spiral around the straight tube. FIG. 5 shows an example of arrangement on the circumference. When having a plurality of side tubes, the hollow fiber bundle may be contained in all of them, or in some of them. If there is a side tube that does not contain a hollow fiber bundle, the end of that side tube may be sealed.

By attaching a plurality of hollow fiber bundles to one straight pipe, it is also possible to make the flow of fluid in the straight pipe more uniform from a macroscopic perspective.

The hollow fiber filtration membrane 3 is inserted from the side pipe section as a hollow fiber bundle bundled in a U-shape or as a hollow fiber bundle with one end of the hollow fibers kept open and the other end closed, and then inserted into the straight pipe section. Extending. From the viewpoint of filtration efficiency, it is preferable that 90% or more of the effective portion of the hollow fiber be located in the straight pipe portion. In terms of space efficiency, it is preferable that the number of straight pipe portions 4 on the side where no hollow fibers is present is small.

The hollow fiber filtration membrane is preferably flexible, and examples of such hollow fibers include ultrafiltration or microfiltration hollow fiber membranes made of materials such as polyolefin, fluorinated polyolefin, polysulfone, and polyacrylonitrile. can be mentioned.

This hollow fiber membrane is held liquid-tightly fixed at the end of the side tube by a potting agent such as polyurethane, epoxy resin, unsaturated polyester resin, silicone resin, etc. while keeping the opening of the hollow fiber in an open state.
A suitable support member may be used to maintain the bent U-shape in the middle of the hollow fiber. It is preferable that the hollow fiber bundles are uniformly distributed in the cross-sectional direction of the straight pipe, but depending on the purpose of filtration, they may be unevenly distributed in a part. The module introduces the fluid to be treated from the straight pipe end a, and the fluid filtered through the membrane is taken out from the side pipe end c through the hollow fiber. on the other hand,
Unfiltered fluid is removed from the other end b of the straight pipe. As a result, the fluid to be filtered flows linearly in the straight pipe, so it has a characteristic that pressure loss is small.

Next, a filtration system formed by connecting the modules in series will be explained. FIG. 2 shows an example in which two modules are connected using a joining straight pipe member, and in this way, the necessary number of stages can be connected. The method of coupling is not limited to the method shown in FIG. 2, and for example, a method of directly fitting straight pipes together may be used. FIG. 3 shows an example in which straight pipes are joined with a curved pipe, and if a curved pipe having an inner diameter approximately equal to or larger than the inner diameter of the straight pipe is used, the pipe can be made compact without increasing the pressure loss. When connecting the modules, connect the hollow fiber bundles so that the U-shaped ends face the same direction, and make sure that the U-shaped ends of the hollow fiber bundles are on the downstream side (outlet side) of the fluid to be treated. , one end of a series of modules connected in series may be used as an inlet for the fluid to be treated, and the other end may be used as an outlet for the fluid to be treated. A pipe for collecting the filtrate fluid at the outlet of the filtrate fluid may be provided to collect the fluid at one location, or the fluid may be received at each location.

FIG. 4 shows an embodiment of a plant that integrates a filtration system using the hollow fiber filtration module of the present invention, a pump, and ancillary equipment. In this example, raw water is circulated through a straight pipe and a circulation line 20. I'm starting to do that. That is, the fluid to be treated (referred to as raw water in this example) is supplied to the raw water line 18 by the supply pump 24, merges with the circulating fluid, and enters the straight pipe via the circulation pump 15. There, the liquid that has been filtered by contacting the hollow fiber membrane exits through the treated water line 19. The unfiltered fluid is circulated through a circulation line by a circulation pump. A valve 25 is provided between each side pipe and the treated water line, and the valve 25 may be opened while checking the quality of the treated water to collect only the treated water of a predetermined quality. A fixed amount of concentrated raw water may be extracted while circulating, or concentrated raw water may be extracted in one pass without circulation. However, in such a system, it is preferable to circulate at least 10 times the amount of raw water supplied. The concentrated raw water may be sent to other treatment steps or returned to the raw water tank. There is an air bleed solenoid valve at the top of the system and a sludge bleed solenoid valve at the bottom.

[Effects of the present invention] As described above, the hollow fiber filtration module of the present invention has a simple structure, is easy to assemble, is easy to connect modules to each other, and has low passage resistance for the fluid to be treated. The system of the present invention is also easy to connect, the pressure loss is very small compared to conventional modules, the filtered and separated substances are easy to recover, and the use of jointed curved pipe members allows it to be installed in narrow spaces. It is also excellent in that it can be placed compactly. This feature of low pressure loss has the effect of saving pump energy.

When the system of the present invention is used vertically, the filtered substances fall to the bottom and settle.
Can be easily separated and taken out. It is also possible to introduce pressurized water or pressurized air from the lowest stage to separate and precipitate substances attached to the hollow fiber bundle, or to float them under pressure. Furthermore, since the system of the present invention has a small pressure drop, it is easy to clean by increasing the flow rate of the fluid to be filtered or by creating a pulsating flow, and it is also easy to clean with chemicals. or,
Replacing the hollow fiber bundle, removing it and cleaning it, etc., becomes easy because only the hollow fiber bundle can be removed from the straight pipe having the side pipe. Of course, it is also possible to replace the entire module.

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

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing one embodiment of the hollow fiber filtration module of the present invention, and FIGS. 2 and 3 show a filtration system in which the hollow fiber filtration modules are connected in series. FIG. 3 is a cross-sectional view showing main parts of an embodiment. Figure 4 shows an embodiment of a plant that integrates a filtration system using the hollow fiber filtration module of the present invention, a pump, and ancillary equipment, and Figure 5 shows how a plurality of side pipes are connected to the circumference of a straight pipe. This is an example placed above. In the figure, 1 is a housing made of a straight pipe with a side pipe, 2 is a side pipe, 3 is a hollow fiber filtration membrane, 4 is a straight pipe part on the side where no hollow fiber is present, 5
6 indicates a joint member, and 6 indicates a cap nut. The fluid to be treated enters through a and exits through b. The filtrate fluid exits at C. In Fig. 4, 11 is a straight pipe with a side pipe, 12 is a connector, 13 is an inlet connector, 14 is an outlet connector, 15 is a circulation pump, 16 is an air vent solenoid valve, 17 is a sludge vent solenoid valve, 18 is a raw water line, 19 is a treated water line, 20 is a circulation line, 21 is a circulating water flow meter, 22 is a treated water flow meter,
23 is an inlet pressure gauge, 24 is a supply pump, 25-2
9 indicates a flow rate control valve.

Claims (1)

[Claims] 1. A hollow fiber bundle bundled in a U-shape or a hollow fiber bundle with one end of the hollow fibers kept open and the other end closed is housed in a housing consisting of a straight pipe having a side pipe. , a hollow fiber filtration module in which a bundle of hollow fibers is present in a part of a side tube part and a part of a straight tube part, which is formed by fixing the opening of the hollow fibers to the end part of the side tube while keeping the openings in an open state. 2. A hollow fiber bundle bundled in a U-shape or a hollow fiber bundle with the opening of the hollow fibers at one end kept open and the other end closed is housed in a housing consisting of a straight tube having a side tube, and the opening of the hollow fibers is A plurality of hollow fiber filtration modules each having a hollow fiber bundle present in the side tube part and a part of the straight pipe part are fixed to the end part of the side pipe while keeping it in an open state. and providing an inlet for the fluid to be treated at one end of the serially connected module row and an outlet for the multi-processing fluid at the other end,
A filtration system in which the side pipe outlet of each module serves as a filtrate fluid outlet.