JPS61291008A - Hollow yarn filter module and filtering system using the same - Google Patents

Abstract

PURPOSE:To facilitate the mutual connection of modules and to reduce pressure loss, by receiving a hollow yarn bundle in a housing comprising a straight pipe having a side pipe and fixing the opening parts of hollow yarns to the end part of the side pipe and allowing the hollow yarn bundle to be partially present in the side pipe part and the straight pipe part. CONSTITUTION:A hollow yarn bundle bundled in a U-shape or a hollow yarn bundle 3 opened at one end thereof and sealed at the other end thereof is inserted in a straight pipe 1 having a side pipe 2 from the side pipe part thereof. A fluid to be treated is introduced into the straight pipe 1 from the end (a) thereof to be filtered by the hollow yarn membrane while the filtered fluid is passed through the hollow yarns to be taken out from the side pipe end (c). The fluid not filtered is taken out from the other end (b) of the straight pipe. Because the fluid to be filtered straightly flows through the straight pipe, pressure loss is reduced. When this module is connected in series, the necessary number of stages are connected by a connection straight pipe member 5.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a hollow fiber filtration module for fluid filtration and a filtration system using the same, and more specifically, 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 suspended solids 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. The latter type has been widely used for these applications because of the large diameter and the tendency for suspended matter to remain in the hollow portions of the hollow fibers and cause clogging.

[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. Receive or
There were inconveniences such as large 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 two 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. A hollow fiber filtration module, 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, and a plurality of such modules are attached to the end of each straight tube. One end of the serially connected module row is provided with an inlet for the fluid to be treated [1], the other end is provided with an outlet for the fluid to be treated, and each module has a side pipe outlet. There is a filtration system with a fluid outlet.

Instead of the U-shaped hollow fiber bundle of the hollow fiber module described in -1-, 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 schematic plan view showing a 1m example 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. It is a sectional view (hollow fiber filtration membrane is not shown) showing the main part of an example of an embodiment. In Figure +L, the angle of the side pipe (2) of the straight pipe (1) having the side pipe is preferably 10 to 90°. 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 at 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 joint 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. Further, a restriction may be inserted in the straight pipe in order to retain the hollow fibers or to locally increase the flow velocity, as long as the pressure drop is not too large.

- The number of side pipes for a straight wooden pipe may be two or more.

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 bundles 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 multiple bundles of hollow fibers to a straight wooden pipe, it becomes 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 part as a hollow fiber bundle bundled in a U-shape or as a hollow fiber bundle with one end kept open and the other end closed. It extends to the section. 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. From the viewpoint of space efficiency, it is preferable that the number of straight pipe portions (4) on the side where no hollow fibers are present is small.

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

This hollow fiber membrane is fixed and held in a liquid-tight manner 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 they may be unevenly distributed in a part depending on the purpose of filtration. The module introduces the fluid to be treated from the straight pipe end a, and the filtered fluid passed through the membrane is taken out from the side pipe end C through the hollow fibers. Meanwhile, unfiltered fluid is removed from the other end of the straight pipe. As a result, the flow of the wave body to be filtered flows linearly in the straight pipe, so that the filter has a characteristic that pressure loss is small.

Next, a filtration system in which the modules are connected 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 required 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. Figure 3 shows an example of joining a straight pipe with a curved pipe.If a curved pipe with an inner diameter approximately equal to or larger than that of the straight pipe is used, the pressure loss will not increase.
Combaku) can be made. When connecting the modules, connect them so that the U-shaped rings of the hollow fiber bundles face the same direction, and connect them in series so that the U-shaped rings of the hollow fiber bundles are on the downstream side (outlet side) of the fluid to be treated. One end of the connected module row 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.

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. In this example, raw water is distributed through straight pipes and circulation lines (20). It is designed to circulate. That is, the fluid to be treated (referred to as raw water in this example) is supplied to the supply pump (2
4) is supplied to the raw water line (18), merges with the circulating fluid, and enters the straight pipe via the circulation pump (15). There, the liquid that has come into contact with the hollow fiber membrane and is filtered 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 can be opened while checking the quality of the treated water to collect only the treated water of a predetermined quality. A certain amount of concentrated raw water may be removed while circulating, or the concentrated raw water may be removed 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] The hollow fiber filtration module of the present invention has a simple structure, is easy to assemble, and can be easily connected to each other, and has low resistance to passage of 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, it is easy to recover filtered and separated substances, and the system of the present invention is easy to connect and can be used in narrow spaces by using joint curved pipe members. It is an excellent product that can be installed compactly anywhere. 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 and separated substances fall to the lowest stage and settle, making it easy to separate and take 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 can be easily cleaned by increasing the flow rate of the fluid to be filtered or by creating a pulsating canal, and it is also easy to clean with chemicals. In addition, 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 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, alloy 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.

[Brief explanation of the drawing]

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 show a filtration system in which the hollow fiber filtration modules are connected in series. FIG. 3 is a 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 of placing 1 on top. 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 membrane, 4 is a straight pipe part on the side where no hollow fiber is present, 5 is a joining member, and 6 is a cap nut. show. The fluid to be treated enters through a and exits through b. The filtered 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, and 15
is a circulation pump, 16 is an air bleed solenoid valve, 17 is a sludge bleed 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-
29 indicates a flow control valve.

Claims (1)

[Scope of Claims] 1. A hollow fiber bundle bundled in a U-shape or a hollow fiber bundle with the opening of the hollow fibers kept open at one end and closed at the other end 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 the side tube part and a part of the straight tube part, and the hollow fibers are fixed to the end part of the side tube while the openings of the hollow fibers are kept open. 2. The hollow fiber bundle bundled in a U-shape or the hollow fiber bundle with the opening of the hollow fibers left open at one end and closed at the other end is housed in a housing consisting of a straight tube with a side tube, and the opening of the hollow fibers is A plurality of hollow fiber filtration modules are fixed to the end of the side tube while the section is kept open, and the hollow fiber bundle is present in the side tube section and a part of the straight tube section. The serially connected module row is provided with an inlet for the fluid to be treated at one end and an outlet for the fluid to be treated at the other end, with the side pipe outlet of each module serving as the filtrate fluid outlet. filtration system.