JPS6338884Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is designed to remove colloids and other substances attached to the outer surface of the hollow fibers when filtering raw water containing colloidal substances such as metal colloids in a hollow fiber module. This invention relates to a hollow fiber module that allows contaminants to be easily removed.

[Conventional technology]

BACKGROUND ART Conventionally, it is known that raw water containing colloidal substances such as metal colloids is filtered by an external pressure method using a hollow fiber module.

[Problem that the invention attempts to solve]

When the above-mentioned hollow fiber type module is used for filtration using the external pressure method, colloids adhere to the outer surface of the hollow fiber, which reduces the amount of water and shortens the service life of the hollow fiber. Although backwashing and other methods have been carried out to remove colloids and the like that have adhered to the outer surface of the cylinder, there is a problem in that sufficient effects cannot be obtained, and countermeasures have been desired.

This invention solves the above-mentioned drawbacks and problems,
The purpose of this method is to remove colloids and the like attached to the outside of hollow fibers using a simple structure.

[Means for solving problems]

After studying various means and methods for preventing a drop in water volume when completely passing through a hollow fiber module using the external pressure method, the inventor of the present invention determined that the hollow fiber bundle was fixed by adhesively fixing the hollow fibers at the lower end of the hollow fiber module. A slit is provided at the end that penetrates the fixed end and opens directly into the module, and when the amount of water decreases as described above, the slit passes through the fixed end of the hollow fiber bundle and opens directly into the module. This paper discovered that by introducing a gas or a liquid containing gas, the introduced gas or liquid containing gas rises along the hollow fiber, and is effective in removing colloids attached to the outer surface of the hollow fiber. The idea has been completed,
That is, the hollow fiber module of the present invention is a hollow fiber module in which both ends of a large number of hollow fibers are adhesively fixed to provide a hollow fiber bundle fixed end, and the hollow fiber end at the lower end of the adhesively fixed module is provided. At the same time, a slit is provided at the fixed end of the hollow fiber bundle at the lower end that opens directly into the module, and the above-mentioned large number of hollow fibers are attached to the housing so as to be able to vibrate by gas introduced through the slit. It is characterized by what it has done.

[Effect]

The present invention seals the lower ends of a large number of hollow fibers whose both ends are fixed with adhesive, and provides a slit that opens directly into the module at the fixed end of the hollow fiber bundle having the sealed lower end. Since the above-mentioned large number of hollow fibers are attached to the housing so as to be able to vibrate by introducing gas or liquid containing gas, when raw water containing colloidal substances such as metal colloids is completely passed through by the external pressure method, the hollow fibers If colloids adhere to the outer surface of the module, causing a decrease in water volume, if gas or a liquid containing gas is directly introduced into the module through the slits described above, the introduced gas will flow along the hollow fibers. Since it rises while shaking, the colloid adhering to the outer surface of the hollow fiber is removed.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

1 is a housing, 2, 2, 2, ... are hollow fibers, the required number of hollow fibers 2, 2, 2, ... are formed into a bundle, these are formed into a bundle, and these are formed into a bundle. Both ends of the hollow fibers 2, 2, 2, . . . are fixed with an adhesive 3 or the like to form a hollow fiber bundle fixed end 4. The upper ends of the hollow fibers 2, 2, 2, . 5
directly passes through the fixed end portion 4 of the hollow fiber bundle on the lower end side of the hollow fiber bundle with the end portion sealed.
2, 2, . . . is a slit for introducing gas or a liquid containing gas. A large number of hollow fibers 2, 2, 2, . . . are bundled as described above.
... are vibrably mounted and assembled in the housing 1 to constitute a vertical hollow fiber module.

6 is a nozzle connected to the lower end of the housing 1 and used for introducing raw water, 7 is a water outlet nozzle connected to the upper end of the housing 1, 8 is a liquid outlet for backwashing, Reference numeral 9 denotes a gas outlet when gas is introduced, and a solenoid valve (not shown) is provided in a pipe (not shown) connected to each of the above-mentioned outlets 8 and 9 to control the discharge.

In the case of a hollow fiber module used vertically, when complete passage is performed by the external pressure method, the flow in the pipes connected to the liquid outlet 8 and the gas outlet 9 is closed with a solenoid valve. Therefore, raw water containing colloidal substances such as metal colloids is introduced under pressure into the housing 1 through the nozzle 6 connected to the lower end of the housing 1, and the introduced raw water is passed through the hollow fibers 2, 2, 2, . It is passed through and becomes colloid-free water, which is then passed through the hollow fibers 2, 2, 2,...
The hollow fibers 2, 2, 2, . . .
The water is extracted from the upper end through the liquid outlet nozzle 7, but if the operation is continued under excessive pressure using the external pressure method, colloids will adhere to the outer surface of the hollow fibers 2, 2, 2, etc. When the water volume decreases in this way, the hollow fiber bundle fixed end 4 to which the sealed lower ends of the hollow fibers 2, 2, 2, . . . are bonded is fixed. A gas such as air or a liquid containing gas is introduced through a slit 5 formed through the module and opened directly into the module, and a solenoid valve communicating with a gas outlet 9 is opened.

The gas introduced through the slit 5 rises along the hollow fibers 2, 2, 2, . . . while shaking the hollow fibers 2, 2, 2, . , 2, 2, . be. Furthermore, if the colloid is not sufficiently removed by the gas or liquid containing gas introduced through the slit 5, backwashing is performed through the upper nozzle 7 of the module. The colloid can be completely removed by opening the solenoid valve of the pipe connected to the pipe, taking out the liquid for backwashing, and then cleaning again with gas or the like, in combination with backwashing.

In order to remove colloids etc. attached to the hollow fibers 2, 2, 2, . Since the purpose is to introduce gas or a liquid containing gas and cause the gas to rise along the respective surfaces of the hollow fibers 2, 2, 2, . . ., the slits 5 are provided as many as possible,
It is effective to make the gas etc. come into contact with the hollow fibers 2, 2, 2, etc. evenly, but on the other hand, if the number of slits 5 is too large, the membrane surface will be reduced, so it is not practical. The number of slits 5 is preferably about 2 to 6, and the shape thereof may be rectangular, circular, or a combination thereof, as shown in FIG. It may be. The slit 5 shown in Fig. 2A is a combination of T-shaped slits, and the slit 5 shown in Fig.
5, . . . are a combination of a plurality of slits 5, .

In addition, 10, 10 in the figure are hollow fibers 2, 2, 2,
This is a protective net provided above and below the hollow fiber bundle in order to prevent the ... from being sucked into the liquid outlet 8 and gas outlet 9 by the flow of the liquid.

〔effect〕

The hollow fiber type module according to the present invention seals the lower ends of a large number of hollow fibers, and forms a slit that penetrates the fixed end of the hollow fiber bundle at the sealed lower end and opens directly into the module. Therefore, when colloids etc. adhere to the outer surface of the hollow fiber and the water volume decreases, gas or a liquid containing gas is introduced through the slit, and the introduced gas, etc. is sealed at the lower end of the hollow fiber. This makes it possible to remove colloids that rise along the hollow fibers and adhere to the outer surface of the hollow fibers, thereby restoring the water volume and significantly extending the life of the module. It has practical effects.

[Brief explanation of the drawing]

Fig. 1 is a conceptual explanatory diagram of a longitudinal section of a part of the hollow fiber module of the present invention, and each of Fig. 2 A to E shows the fixed end of the hollow fiber bundle at the lower end of the hollow fiber module of the present invention. FIG. 3 is a conceptual diagram showing the shape of a slit to be opened. 1: Housing, 2, 2, 2, ...: Hollow fiber,
4: Hollow fiber bundle fixed end, 5: Slit, 6: Introducing nozzle for raw water, etc., 7: Water outlet nozzle, 8: Water outlet during backwashing, 9: Gas outlet during gas introduction, 10 : Protective net.

Claims (1)

[Scope of utility model registration request] In a hollow fiber type module in which a hollow fiber bundle fixed end is provided by adhesively fixing both ends of a large number of hollow fibers, the hollow fiber ends at the lower end of the adhesively fixed module are sealed, and the hollow fibers at the lower end are sealed. A hollow fiber type module characterized in that a slit that opens directly into the module is provided at the fixed end of the bundle, and the plurality of hollow fibers described above are mounted on a housing so that they can vibrate by gas introduced through the slit.