JPS61192309A - Hollow yarn type module - Google Patents

Abstract

PURPOSE:To make it possible to simply and efficiently remove a contaminant such as colloid, by embedding air sending pipes opened at both ends in hollow yarn bundles in a dispersed state so as to pierce through the lower adhered and fixed part of a hollow yarn type module. CONSTITUTION:Hollow yarn bundles comprising hollow yarns 2 each opened at the upper end thereof and closed at the lower end thereof are received in a housing 1 and a large number of air sending pipes 5 longer than a lower adhered and fixed part 3 and opened at both ends thereof are embedded in the hollow yarn bundles in a dispersed state so as to pierce through the lower adhered and fixed part 3. When the filtering efficiency of each hollow yarn is lowered by the adhesion of colloid to the outer wall of the hollow yarn during the filtering of raw water, the supply of raw water is stopped and gas or a gas-containing liquid is sent into the hollow yarns through the air sending pipes 5 and a contaminant such as colloid is released from the wall of each hollow yarn by sent-in gas to restore the activity of the hollow yarn. Because hollow yarns hold sufficient intervals by the isolation pipes 4 in an upper adhered and fixed part 3, the sent-in gas uniformly rises through the hollow yarn bundles to enhance removal capacity.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention uses a hollow system module to filter raw water containing contaminants using an external pressure method. The present invention relates to a hollow fiber module that allows contaminants such as colloids to be easily removed.

(Prior art and its problems) When raw water containing colloidal substances such as metal colloids or raw water containing other contaminants is filtered using a hollow fiber module using an external pressure method, the outer surface of the hollow fiber As contaminants such as colloidal substances adhere to the water, the amount of water passing through the mouth gradually decreases.
Moreover, the -1 hollow fiber has the disadvantage that its service life is shortened. Therefore, backwashing and the like have been carried out to remove colloids and the like adhering to the outer surface of the hollow fibers, but sufficient effects have not been obtained.

In order to solve this problem, the inventor separately provided a slit that penetrates the adhesive fixing part in which the hollow fiber bundle is adhesively fixed at the bottom of the hollow fiber type module, so that when the amount of water passing through the mouth decreases. proposed that colloidal substances adhering to the hollow fibers be removed by introducing gas or a liquid containing gas through the slit I. According to this proposal, it is effective in removing colloids, etc., but on the other hand, the hollow fibers are easily damaged when making slits, and if the number of slits is small, the colloidal substances are removed only by the hollow fibers near the slits. However, if the number of slits is increased, the work becomes difficult.

(Object of the Invention) In order to solve the above-mentioned problems, the present invention provides a hollow fiber module that can easily and efficiently remove contaminants such as colloids attached to the outside of the hollow fibers. .

(Structure of the Invention) The present invention provides a hollow type module in which the upper and lower ends of a large number of hollow fibers, each of which is open at the upper part and closed at the lower part, are fixed with an adhesive. The trachea is dispersed and buried within a hollow fiber bundle, and in some cases,
Furthermore, it is characterized in that isolation tubes with at least one end closed are embedded in the upper adhesive fixing part and are dispersed within the hollow fiber bundle.

(Embodiment) Next, the hollow fiber type module of the present invention will be explained with reference to the drawings.

1 to 3 show an example of a hollow fiber type module of the present invention. The hollow bundle is housed in a housing (1) with its upper and lower ends fixed with adhesive. Each hollow fiber (2) is open at the -F end and closed at the lower end; one end is fixed by an upper adhesive fixing part (3) and the lower end is fixed by an adhesive fixing part (3) described below. In the lower adhesive fixing part (3), a large number of air supply pipes (5), which penetrate the fixing part and are longer than the thickness of the adhesive fixing part and are open at both ends, are dispersed and buried within the hollow fiber bundle. (Figure 2). On the other hand, in the upper adhesive fixing part (3),
Isolation tubes (4) with both ends or one end of the hollow fibers closed are dispersed and embedded within the hollow fiber bundle (Fig. 3).

Raw water pressurized into the module from the raw water inlet (6) enters the outside of each hollow fiber (2) in the housing, and contaminants such as colloids contained in the raw water are removed to the outside of the hollow fibers (2). The remaining clean water passed through the hollow fiber wall passes through the upper adhesive fixing part and is discharged from the passed water outlet (7).

When colloids etc. gradually adhere to the outer wall of the hollow fiber and the filtration efficiency decreases, the raw water is fed through the air pipe (5).
A gas or a liquid containing gas is introduced through the Contaminants such as colloids are peeled off from the walls of the hollow fibers by the introduced gas, and the activity of the hollow fibers is restored. The injected gas collects at the bottom of the upper adhesive fixing part after removing contaminants. Furthermore, if isolation tubes (4) are dispersed and buried in the adhesive fixing part (3) in the upper part, each hollow fiber will maintain sufficient spacing, so the injected gas will be distributed uniformly within the hollow fiber bundle. It flows upward, further improving removal performance. Since the isolation tube (4) is closed at both ends or at one end, gas will not be mixed into the drinking water. Contaminants removed from the hollow fiber wall are removed from the colloid liquid outlet (8).
Then, the gas is discharged and removed intermittently from the gas outlet (8), and after the activity of the hollow fibers is restored, the filtration is restarted.

The diameter of the air pipe is preferably about 0.1 to 10 fflI11 in inner diameter. If it is less than 0.1 mm, the amount of gas or gas-containing liquid introduced through the air pipe will be insufficient, and colloids etc. adhering to the outer surface of the hollow fibers will be insufficiently removed.
Moreover, if it exceeds 10 mm, problems such as the introduced gas not being sufficiently dispersed or the number of hollow fibers decreasing will occur, such as a decrease in filtration efficiency.

The length of the air supply pipe can be adjusted arbitrarily so that gas can be suitably introduced. The number of air pipes varies depending on the diameter of the air pipe and the diameter of the module used. The larger the number, the more effective it is in removing colloids, etc., but the hollow fiber membrane area will decrease, so please take these points into consideration. It is necessary to decide appropriately.

(Effects of the Invention) The hollow fiber module of the present invention allows easy removal of contamination and substances, and can maintain high filtration efficiency.

[Brief explanation of drawings]

FIG. 1 is a conceptual explanatory diagram showing a part of the hollow fiber type module of the present invention in longitudinal section. FIG. 2 is a cross-sectional view taken along line AA' in FIG. 1, conceptually enlarging the relationship between the air pipe and the hollow fibers, and FIG. 3 is a cross-sectional view taken along line AA' in FIG. 1. This is a cross-sectional view drawn by lines, conceptually enlarging the relationship between the hollow system and the isolation tube. 1 Housing 5 Air supply pipe 2 Hollow fiber 6 Raw water inlet 3 Adhesive fixing part 70 Super water outlet 4 Isolation pipe 8 Gas extraction outlet 9 Colloid liquid outlet

Claims (2)

[Claims] (1) In a hollow fiber module in which the upper and lower ends of a large number of hollow fibers are fixed with adhesive, the upper part is open and the lower part is closed, the hollow fibers pass through the lower adhesive fixing part and connect the air pipe with both ends open. A hollow fiber module characterized by being dispersed and buried within a bundle. (2) In a hollow fiber module in which both the upper and lower ends of a large number of hollow fibers, which are open at the upper end and closed at the lower end, are fixed with an adhesive, the air supply tube with both ends open is inserted into the hollow fiber bundle by passing through the lower adhesive fixing part. What is claimed is: 1. A hollow fiber module characterized in that isolation tubes with at least one end closed are dispersed and buried within the hollow fiber bundle in the upper adhesive fixing part.