TW201703849A - Hollow fiber membrane module capable of thoroughly removing suspended matters attached to hollow fiber membranes - Google Patents

Abstract

The present invention provides a hollow fiber membrane module capable of thoroughly removing suspended matters attached to hollow fiber membranes. Raw water flows through an inflow opening (1e), an inflow chamber (5), holes (4a), a treating chamber (6), communicating pipes (10), a discharge chamber (9), and a discharge opening (1f). Penetrating water that penetrates the hollow fiber membranes (2) is extracted from a penetrating water chamber (7) through an extraction opening (1g). When bubbling cleaning is performed, air is supplied from the inflow opening (1e). Because the holes (4a) and the communicating pipes (10) are equally arranged in the whole region of pouring parts (4,3), the upper parts of all the hollow fiber membranes (2) can be sufficiently subjected to bubbling cleaning.

Description

Hollow fiber membrane module

The present invention relates to a hollow fiber membrane module, and more particularly to a hollow fiber membrane module capable of sufficiently washing and removing a suspended substance attached to a membrane.

When the hollow fiber membrane module is used to perform the filtration treatment of the dirty water by the external pressure method, when the suspended matter adheres to the hollow fiber membrane, the filtration life of the hollow fiber membrane module is shortened, and the filtration flow rate is lowered. Then, when a suspended substance adheres to the hollow fiber membrane, the suspended matter is removed by performing countercurrent washing and bubbling with air.

In the conventional hollow fiber membrane module, the discharge port for the bubbling air is often disposed on one side of the container directly below the upper infusion portion. In the hollow fiber membrane module, it is difficult for the foaming air to reach the hollow fiber membrane located on the side opposite to the discharge port, and the washing is incomplete.

Patent Document 1 discloses a hollow fiber membrane module in which an air discharge hole is provided in a peripheral portion of an upper upper side filling portion for binding the hollow fiber membrane, and air at the time of foaming passes through the air discharge hole to the upper pouring portion. The upper chamber is discharged. However, the hollow fiber disclosed in Patent Document 1 In the membrane module, since the air for foaming is concentrated on the peripheral portion of the upper infusion portion, the cleaning of the hollow fiber membrane on the central side of the infusion portion is incomplete.

Patent Document 2 discloses a hollow fiber membrane module in which a water to be treated (raw water) supply nozzle is provided in a central portion of a lower infusion portion, and a connection pipe for discharging concentrated water is connected to a central portion of the upper infusion portion. In the hollow fiber membrane module, the microparticles are housed in a processing chamber in which the hollow fiber membranes are disposed, and the treated water flows out from the nozzles in the radial direction to fly the microparticles, thereby preventing the gel layer from adhering to the hollow fiber membranes. .

In the hollow fiber membrane module of Patent Document 2, even if the microparticles are allowed to fly, the microparticles do not easily reach the upper portion of the processing chamber. Therefore, it is easy to cause incomplete cleaning of the upper portion of the hollow fiber membrane. In addition, since the connection pipe is disposed in the center portion of the upper infusion portion, the water to be treated and the fine particles are likely to be concentrated on the center side of the treatment chamber, and as a result, the upper portion of the hollow fiber membrane on the outer peripheral side of the perfusion portion is likely to be incompletely cleaned.

[Patent Document 1] Japanese Patent Laid-Open No. 6-343836

[Patent Document 2] Japan Real Fair 4-41932

As described above, in Patent Document 1, the hollow fiber membrane on the center side of the infusion portion is likely to be incompletely cleaned, and in Patent Document 2, the hollow fiber membrane on the outer peripheral side of the perfusion portion is likely to be incompletely cleaned.

The object of the present invention is to provide a hollow fiber membrane which can completely and completely remove the suspended matter adhered to the hollow fiber membrane. Module.

The hollow fiber membrane module of the present invention comprises a container, a plurality of hollow fiber membranes, and an upper infusion portion, wherein the container has a raw water inlet at a lower portion, and a permeated water outlet and a concentrated water outlet at an upper portion; the hollow fiber membrane The raw water is separated into permeated water and concentrated water, and is disposed in the container in the vertical direction; the upper infusion portion is an upper portion of the hollow fiber membrane that is fixed and disposed in the upper portion of the container; The utility model is characterized in that a partition plate is arranged on the upper side of the upper side pouring portion, a discharge chamber for concentrating water and foaming air is arranged on the upper side of the partition plate, and a permeated water chamber is arranged between the partition plate and the upper side pouring portion. The communication tube communicating with the permeated water chamber in the hollow fiber membrane and communicating with the lower side of the upper infusion portion is provided in the entire region of the upper perfusion portion.

In the present invention, it is preferable that the partition plate and the upper infusion portion are respectively provided with through holes in the vertical direction, and the upper end and the lower end of the communication tube are inserted into the through holes.

Further preferably, a lower portion lower pouring portion for restraining the hollow fiber membrane is provided, and an inflow chamber for communicating the lower side of the lower pouring portion is disposed in the upper and lower portions of the lower filling portion A communication hole of the processing chamber of the upper side of the lower side filling portion.

When the air for foaming and cleaning the hollow fiber membrane module of the present invention is introduced from the lower portion of the container, the bubbling air flows out of the concentrated water outlet through the processing chamber, the communication tube, and the discharge chamber.

In the present invention, since the communication tube is provided over the entire area of the upper infusion portion, the air for bubbling can be brought into contact with the upper portion of all the hollow fiber membranes without any omission, and all the hollow fiber membranes can be sufficiently washed. The performance of the hollow fiber membrane is completely restored.

In particular, by providing a hole in the upper and lower direction in the entire region of the lower infusion portion, the air for bubbling can be brought into contact with all the hollow fiber membranes without any omission, and the suspended matter can be completely removed from all the hollow fiber membranes. Remove.

1‧‧‧ container

1A‧‧‧胴

1B‧‧‧Top cover

1C‧‧‧ bottom cover

1a, 1b, 1c‧‧‧ flange

1e‧‧‧flow entrance

1f‧‧‧Export

1g‧‧‧Export

2‧‧‧ hollow fiber membrane

3‧‧‧Upper perfusion

3a, 8a‧‧‧through holes

4‧‧‧Inferior perfusion

4a‧‧‧Connected holes

5‧‧‧Inflow room

6‧‧‧Processing room

7‧‧‧through water room

8‧‧‧Baffle

9‧‧‧Exit room

10‧‧‧Connected pipe

Fig. 1 is a schematic longitudinal cross-sectional view showing a hollow fiber membrane module according to an embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view showing a part of the hollow fiber membrane module of the embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to Figs.

As shown in Fig. 1, the hollow fiber membrane module includes a container 1 that is disposed such that the axial direction of the cylinder is in the vertical direction (the vertical direction in the present embodiment). The container 1 has a cylindrical crotch portion 1A, a top cover body 1B, and a bottom cover body 1C. The crotch portion 1A, the top cover body 1B, and the bottom cover body 1C are connected by flanges 1a, 1b, and 1c, respectively. Raw water is provided in the bottom cover 1C The inflow port 1e for bubbling air is provided with a discharge port 1f for concentrating water or bubbling air in the top cover body 1B. An outlet 1g for treating water is provided in an upper portion of the crotch portion 1A.

A plurality of hollow fiber membranes 2 are disposed in the container 1. The hollow fiber membrane 2 is fixed at its upper end by an upper side pouring portion 3 made of synthetic resin, and its lower end is embedded in the lower infusion portion 4 to be closed. As the synthetic resin of the infusion portions 3 and 4, for example, an epoxy resin can be used. The filling portions 3, 4 are horizontally arranged.

The lower side of the lower infusion portion 4 serves as the inflow chamber 5, and the lower infusion portion 4 and the upper infusion portion 3 become the processing chamber 6. The partition plate 8 is provided substantially horizontally above the upper infusion portion 3, and becomes a permeated water chamber 7 between the upper infusion portion 3 and the partition plate 8. The upper side of the partition plate 8 serves as the discharge chamber 9.

The filling portions 3, 4 have a disk shape, and the outer peripheral surface thereof is fluid-tightly connected to the inner surface of the container 1. In Fig. 1, in order to easily show that only four hollow fiber membranes 2 are shown in the drawings, in practice, the hollow fiber membrane 2 is provided with a plurality of strips. The upper end side of the hollow fiber membrane 2 is inserted through the pouring portion 3, and the opening at the upper end thereof faces the permeated water chamber 7, and the inside of the hollow fiber membrane 2 communicates with the permeated water chamber 7.

A communication pipe 10 having an inner diameter of about 4 to 10 mm is provided to connect the processing chamber 6 and the discharge chamber 9. As shown in the enlarged view of Fig. 2, through holes 8a, 3a are formed in the partition plate 8 and the upper infusion portion 3 in the vertical direction, respectively, and the upper end and the lower end of the communication tube 10 are inserted into the holes 8a, 3a. The outer peripheral surface of the upper portion of the tube 10 and the inner peripheral surface of the hole 8a, and the outer peripheral surface of the lower portion of the tube 10 and the inner peripheral surface of the hole 3a are each liquid-tightly fixed by an adhesive or the like. The holes 8a, 3a are equally arranged over the entire area of the disk surface of the partition plate 8 and the upper side filling portion 3. The communication tube 10 is made of a water-impermeable material such as metal or synthetic resin.

In the lower filling portion 4, as shown enlarged in FIG. 2, the communication hole 4a for connecting the inner diameter of the inflow chamber 5 and the processing chamber 6 to about 5 to 10 mm is continuous in the vertical direction. The hole 4a is equally disposed over the entire area of the disk surface of the lower infusion portion 4.

When the raw water is treated by the hollow fiber membrane module having the above-described configuration and the water is collected, the raw water is supplied to the inflow port 1e by a raw water supply device (not shown) having at least the raw water pump and the pipe. The raw water flows into the processing chamber 6 through the inflow port 1e, the inflow chamber 5, and the hole 4a. While the raw water rises in the processing chamber 6, a part of the water passes through the hollow fiber membrane 2, and the permeated water passes through the permeated water chamber 7 and is taken out from the take-out port 1g.

The water that has not passed through the hollow fiber membrane 2 during the rise in the processing chamber 6 is concentrated water, and is discharged from the communication tube 10 to the outside of the container 1 through the discharge chamber 9 and the discharge port 1f.

When the raw water treatment operation is continued as described above, the suspended matter is adhered to the hollow fiber membrane 2, and the countercurrent washing and the foaming washing are performed. When the countercurrent washing is performed, the countercurrent washing washing water (preferably the water that has passed through the hollow fiber membrane module) is supplied from the outlet 1g to the permeated water chamber 7, and the countercurrent washing drainage is discharged from the inflow port 1e. .

When the foaming is performed, air or air and water (for example, raw water) are supplied from the inlet 1e in a state where raw water or concentrated water is stored in the processing chamber 6, and foaming occurs in the processing chamber 6. Air is supplied by an air pump and piping. Air bubbles are raised in the processing chamber, thereby allowing the hollow fiber membrane to 2 Vibration, and the attached suspended matter is peeled off. The suspended substance after the peeling is discharged from the discharge port 1f via the communication pipe 10 and the discharge chamber 9.

After the completion of the foaming washing, the washing water is allowed to flow from the inlet 1e, and the water containing the suspended matter remaining in the processing chamber 6 is discharged from the discharge port 1f. As the washing water, it is sufficient to use raw water, but other clean water can also be used.

After such a washing step, the water collecting step is started again.

In the cleaning step, since the holes 4a and the communication tubes 10 are equally disposed in the entire region of the pouring portions 4, 3, the air for bubbling can contact all the hollow fiber membranes 2 without fail, and all the hollow fibers can be provided. The film 2 is sufficiently washed to completely restore the performance of the hollow fiber membrane 2. According to the present embodiment, even if the air for bubbling is in contact with all of the hollow fiber membranes 2 directly under the upper infusion portion 3, the suspended matter can be sufficiently removed in the upper portion of all the hollow fiber membranes 2 . The washing and draining liquid containing the suspended substance after peeling flows out through the communicating pipe 10 to the discharge chamber 9, and therefore does not mix into the permeated water chamber 7 at all.

Further, when the arrangement density of the hollow fiber membranes 2 of the upper perfusion portion 3 is set to 300 to 600 per 100 cm ² (10 × 10 cm ² ), the arrangement density of the communication tubes 10 is preferably set to 10 per 100 cm ^{2 .} ~90, more preferably 50~70. In this case, the arrangement density of the holes 4a of the lower infusion portion 4 is preferably set to be 10 to 90, more preferably 50 to 70, per 100 cm ² .

The above embodiment is an example of the present invention, and the present invention may also It is a form other than the illustration. For example, in the above embodiment, air is supplied from the inflow port 1e, but an air introduction port or an air nozzle which is different from the inflow port 1e may be provided. Further, a water-passing gap may be formed between the outer circumference of the lower infusion portion 4 and the inner circumferential surface of the container 1. Further, the lower infusion portion 4 may not be provided, and the lower end of the hollow fiber membrane 2 may be a free end. In this case, the lower end of the hollow fiber membrane is latched (closed).

The present invention has been described in detail with reference to the particular embodiments of the invention, and various modifications may be made without departing from the scope of the invention.

This application is based on Japanese Patent Application No. 2014-114075 filed on Jun. 2, 2014, the entire disclosure of which is hereby incorporated by reference.

1‧‧‧ container

1A‧‧‧胴

1B‧‧‧Top cover

1C‧‧‧ bottom cover

1a, 1b, 1c‧‧‧ flange

1e‧‧‧flow entrance

1f‧‧‧Export

1g‧‧‧Export

2‧‧‧ hollow fiber membrane

3‧‧‧Upper perfusion

4‧‧‧Inferior perfusion

4a‧‧‧Connected holes

5‧‧‧Inflow room

6‧‧‧Processing room

7‧‧‧through water room

8‧‧‧Baffle

9‧‧‧Exit room

10‧‧‧Connected pipe

Claims (6)

A hollow fiber membrane module comprising a container, a plurality of hollow fiber membranes and an upper filling portion, the container having a raw water inlet at a lower portion and a permeated water outlet and a concentrated water outlet at an upper portion; the hollow fiber membrane is The raw water is separated into permeated water and concentrated water, and is disposed in the container in the vertical direction; the upper infusion portion is an upper portion of the hollow fiber membrane that is fixed and disposed in the upper portion of the container; a partition plate is disposed above the upper side pouring portion, a discharge chamber for concentrating water and foaming air is disposed on the upper side of the partition plate, and a permeated water chamber is disposed between the partition plate and the upper side pouring portion. The communication tube communicating with the permeated water chamber in the processing chamber and communicating with the discharge chamber is disposed in the entire area of the upper perfusion portion. The hollow fiber membrane module according to the first aspect of the invention, wherein the partition plate and the upper infusion portion are respectively provided with through holes in the vertical direction, and the through holes are inserted into the upper end and the lower end of the communication tube. The hollow fiber membrane module according to claim 1 or 2, wherein a lower end side infusion portion for restraining the hollow fiber membrane is provided, and a lower side of the lower side infusion portion is an inflow chamber, the lower portion The side filling portion and the aforementioned upper side pouring portion become the aforementioned treatment The chamber has a communication hole for communicating the inflow chamber and the processing chamber in an upper and lower direction in the entire region of the lower infusion portion. The hollow fiber membrane module according to claim 3, wherein the hollow fiber membranes in the upper side infusion portion have a density of 300 to 600 per 100 cm ² , and the arrangement density of the communication tubes is 100 cm ² It is 10~90. The hollow fiber membrane module according to the invention of claim 4, wherein the arrangement density of the communication holes in the lower infusion portion is 10 to 90 per 100 cm ² . A method for cleaning a hollow fiber membrane module, which is a method for cleaning a hollow fiber membrane module according to any one of claims 1 to 5, which comprises: supplying air to a lower portion of the container Or air and water to cause foaming in the aforementioned treatment chamber.