KR20040052192A - Hollow Fiber Membrane Module Combined with Air Diffuser - Google Patents

Abstract

PURPOSE: Provided is a diffuser coupled hollow fiber separating membrane module which occurs less fouling, a phenomenon of adhering contaminants to the surface of the hollow fiber separating membrane when the hollow fiber separating membrane module filters and discharges treating water in a biological reaction tank. CONSTITUTION: The diffuser coupled hollow fiber separating membrane module comprises a hollow fiber separating membrane, a lower part structure comprising diffusers(1-a,1-b), where the hollow fiber separating membrane is hanged as a U-shape, a lower part support(4-a), a diffuser connector(4-b) and a leg(6) where an air or oxygen inlet and an air or oxygen generating hole(2) are formed, an upper part hollow fiber separating membrane distributing structure able to disperse and position the end of a bundle of the hollow fiber separating membrane, a head sealing the hollow fiber separating membrane and the upper part hollow fiber separating membrane distributing structure and having a filtered water outlet supports connecting the upper part hollow fiber separating membrane distributing structure and the lower part structure.

Description

Hollow Fiber Membrane Module Combined with Air Diffuser}

The present invention relates to a hollow fiber membrane module that can filter out only the treated water except solid liquids including activated sludge by immersing in a bioreactor. More specifically, when the hollow fiber membrane module filters and discharges the treated water in the bioreactor, contaminants adhere to the surface of the hollow fiber membrane, that is, fouling occurs. It is about.

In the lower structure of the hollow fiber membrane module provided by the present invention has an diffuser including a hole capable of generating air or oxygen, the hollow fiber membrane suspended in the U-shape in the diffuser can generate the air or oxygen It can be directly cleaned by air or oxygen generated from the hole. In other words, the present invention by the air or oxygen supplied to the hollow fiber membrane, the hollow fiber membrane which is suspended in the diffuser and sealed in the upper hollow fiber membrane distribution structure vibrates left and right to minimize fouling of the hollow fiber membrane In addition, the present invention provides a diffuser integrated hollow fiber membrane module that can maintain permeation performance for a long time.

Conventional flat membrane or hollow fiber membrane module has a problem in that the permeation performance and the life of the membrane decreases due to the deposition of activated sludge and other reaction by-products on the surface of the membrane in filtration and discharge of the treated water by immersing in the bioreactor. In order to overcome this problem, there are efforts to maintain permeation performance by inhibiting or removing adhesion of activated sludge and other by-products to the membrane module by drugs such as NaOCl, NaOH, and H ₂ O ₂ .

Meanwhile, since most membrane modules are provided by installing a membrane corresponding to a treatment capacity in a structure called a frame, a technique of applying a separate or circular shaped diffuser to the bottom of the membrane module of the frame structure is used to suppress fouling. come. However, even in this case, after several months, fouling to the membrane becomes severe, requiring the means by the aforementioned chemicals.

On the other hand, in the prior art, when the diffuser, such as a separate circular or cylindrical for the cleaning of the membrane module and the membrane structure to the frame structure is to increase the volume of the entire frame. Therefore, there is a disadvantage in that it is not easy to install the separator module in a suitable element.

The present inventors to suppress the fouling of the hollow fiber membrane module, to provide a hollow fiber membrane module that does not degrade the permeation performance even if used for a long time.

1 is a schematic view of the lower structure of the hollow fiber membrane module of the present invention.

Figure 2 is an air inlet or oxygen inlet of the diffuser of the present invention.

Figure 3 is a front view of the entire structure of the hollow fiber membrane module of the present invention.

4 is a schematic view of the upper hollow fiber membrane distribution structure of the present invention.

5 is a top view of the hollow fiber membrane module head of the present invention.

Figure 6 is a side view of the diffuser integrated hollow fiber membrane module of the present invention.

Figure 7 is a schematic diagram of the ventilation system of the diffuser integrated hollow fiber membrane module of the present invention.

8 is a wastewater treatment process using the diffuser integrated hollow fiber membrane module of the present invention.

9 is a chart of the results of Example 1 and Comparative Example 1. FIG.

10 is a chart of the results of Example 2 and Example 3. FIG.

-Explanation of symbols for the main parts of the drawings

1-a. Diffuser 1-b. Diffuser

2. Air or oxygen generating hole 3-a. Diffuser connecting rod

3-b. Diffuser connector 4-a. Lower support and diffuser connection

4-b. Lower support and diffuser connection 5-a. Lower support insertion hole

5-b. Lower support insertion hole 6. Leg

7-a. Air or oxygen inlet 7-b. Air or oxygen inlet

8-a. Support 8-b. support fixture

9. Upper Hollow Fiber Membrane Distribution Structure 10-a. Upper support insertion hole

10-b. Top support insertion hole 11. Hollow fiber membrane distribution hole

12. Head 13. Filtrate outlet

14-a. Frame Retaining Groove 14-b. Frame fixing groove

15. Hollow fiber separator 16. Sealing

17. Drops of air or oxygen generation 18. Influent wastewater

19. Bioreactor 20. Filtration line

21. Suction pump 22. Treatment water

23. Air or oxygen line 24. Brow

To this end, the present invention provides an diffuser-integrated hollow fiber separator that integrally forms an diffuser that supplies air or oxygen to the lower portion of the hollow fiber separator.

That is, the diffuser integrated hollow fiber membrane of the present invention

a) hollow fiber membrane (15),

b) an air inlet (7-a), an air or oxygen generating hole (2) is formed and the diffuser (1-a, 1-b) through which the hollow fiber membrane (15) is hung in a U-shape, An undercarriage comprising a lower support and an diffuser attachment (5-a, 5-b) and a leg (6),

c) an upper hollow fiber membrane distribution structure 9 capable of dispersing the ends of the hollow fiber membrane bundle bundles;

d) the head 12 sealing the hollow fiber membrane 15 and the upper hollow fiber membrane distribution structure 9, the filter 12 is provided with a discharge water (13) and

e) a support (8-a) for connecting the upper hollow fiber membrane distribution structure (9) and the lower structure.

The present invention is further characterized by a diffuser connecting rod (3-a) connecting the diffuser and the distal end of the diffuser.

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 8.

The present invention is integrally installed in the lower portion of the hollow fiber separation membrane and also by the air or oxygen droplets (17) generated in the diffuser (1-a, 1-b) that is hanging the bundle of the hollow fiber membrane in the U-shape It relates to a diffuser integrated hollow fiber membrane to minimize the contamination of the hollow fiber membrane (15) by vibrating the bundle of hollow fiber membrane (15) left and right (Fig. 7). In addition, the hollow fiber membrane of the present invention, the air or oxygen droplet 17 rises to the outside and inside of the hollow fiber membrane module (Fig. 6) and induces the diffusion of contaminants on the surface of the hollow fiber membrane (Fig. 7), The effect of removing the fouling material can be maintained to maintain the permeability for a long time. That is, the present invention provides a diffuser integrated hollow fiber membrane module (FIG. 6) that does not need to separately install a diffuser such as a circular or cylindrical shape.

The hollow fiber separator used in the present invention may be a conventional hollow fiber separator. Preferably, the hollow fiber separator of the present invention has a polyvinylidene on the surface of the hollow fiber fibers composed of polypropylene (PP) or polyethylene (PE) having a pore of 0.1 to 0.4 ㎛, preferably in the range of 0.2 ㎛ The polyvinylidene fluoride (PVDF), polysulfone (polysulfone, PSf), polyethersulfone (polyethersulfone (PES), and the like is applied or coated with one or more polymers of polymers, such as PP and PE. The hollow fiber membrane has a tensile strength of 30,000 gf / fil or more, an outer diameter of 1.5 to 2.5 mm, preferably 2.0 mm, and a number of 500 to 2000 with a length of 0.5 to 1.5 m and an area of 5 to 15 m ^2. It is characterized by that.

The substructure of the hollow fiber membrane module is divided into three parts in the longitudinal direction of the air or oxygen inlets (7-a, 7-b), diffusers (1-a, 1-b), legs (6), and diffusers. Consists of the support and the diffuser connector (4-a, 4-b) and may be provided with a diffuser connector (3-a, 3-b) for connecting both ends of the diffuser if necessary. The air or oxygen inlet is provided in the diffuser or diffuser connecting rod is provided with one or two or more.

The diffuser (1-a, 1-b) is provided with air or oxygen generating holes, the hollow fiber membrane 15 is caught in a U-shape. The diffuser 1-a, 1-b may be square or circular, and the inside is empty. The holes 2 for generating air or oxygen of the diffusers 1-a and 1-b have a diameter of 0.5 to 4 mm, preferably 2 to 3 mm. It can be the same or different. For example, the air or oxygen generating hole 2 may gradually increase in size as it moves away from the air or oxygen inlet. The interval between the air or oxygen generating holes 2 can be 1 to 5 cm. Air or oxygen generating hole (2) may be provided at one or more positions of the upper, lower, left, right of the diffuser, the number can be 2 to 8 between the leg (6) and the leg (6).

The amount of air or oxygen generated in the air or oxygen generating hole 2 is 0.5 to 3.5 m / hr, preferably 0.8 to 2.5 m / hr, per unit area of the hollow fiber separation membrane 15.

The lower support and the diffuser connector (4-a, 4-b) of the lower structure (FIG. 1) have lower support insertion holes, and the upper hollow fiber membrane distribution structure at the lower support insertion holes (5-a, 5-b). The upper support insertion holes (10-a, 10-b) of (9) can connect the support (8-a, 8-b). The support (8-a, 8-b) can be used round, oval or square, but preferably round or oval with a diameter of 1 to 3 cm, the length of the hollow fiber separation membrane 15 in length It is adjusted to and provided at 0.2 to 1 m. Meanwhile, the support may be located outside the distribution structure 9.

Hollow fiber membrane distribution holes 11 of the upper hollow fiber membrane distribution structure 9 capable of distributing both ends of the hollow fiber membrane 15 in a U-shape in the diffuser pipes 1-a and 1-b. Shall be 6-12. The number of hollow fiber separation membranes 15 inserted into the distribution holes 11 can be 100 to 300. The upper support insertion holes 10-a and 10-b of the upper hollow fiber membrane distribution structure 9 may be positioned at three centered points in the longitudinal direction of the upper hollow fiber membrane distribution structure 9.

Also provided is a head 12 portion for sealing 16 an upper hollow fiber separator distribution structure 9 comprising a hollow fiber separator 15. The provided head 12 is provided with a filtered water outlet 13 for discharging the filtered water of the hollow fiber separation membrane 15, the frame fixing groove that can connect and fix the hollow fiber membrane module (Fig. 6) to the frame ( 14-a, 14-b). The frame fixing grooves 14-a and 14-b are provided at one side on each side, but may be placed at both sides.

It is preferable that the length of the head 12 portion and the lower structure (Fig. 1) sealing the upper hollow fiber membrane distribution structure 9 is the same, and the width is the same or different, in a ratio of 1: 1 to 1: 2.5. Is provided. The diffuser integrated hollow fiber membrane module (FIG. 6) provided with a width ratio of 1: 1.5 has a trapezoidal shape from the side.

According to FIG. 7, the air or oxygen droplets 17 generated through the holes 2 through which air or oxygen is generated shake the bundle of U-shaped hollow fiber membranes 15 to the left and right, and the upper distribution structure and the lower structure. The effect of vibrating both ends of the hollow fiber separation membrane (15) over (Fig. 1) will contribute to minimize the fouling element. In addition, the air bubbles 17 rising to the center rise to the outside and inside of the hollow fiber membrane and induce the diffusion of contaminants on the surface of the hollow fiber membrane (FIG. 7), giving the effect of removing the potential fouling material for a long time Permeability can be maintained.

According to the process example shown in FIG. 8, when the wastewater is introduced 18, the provided diffuser-integrated hollow fiber membrane module (FIG. 6) is provided with the treated water (20) by the suction pump 21 through the filtration-treated water line 20. 22) is filtered out, and air or oxygen droplets (17) through the air or oxygen inlet (7-a, 7-b) of the air line 23 and the module by the blower 24 for injecting air Provided continuously. The treatment amount FLUX of the diffuser-integrated hollow fiber membrane module of the present invention is 30 to 45 LMH (L / m 2 · hr).

Hereinafter, the present invention will be described in detail with reference to Examples, but the scope of the present invention is not limited in any form by the following Examples.

The amount of treated water (FLUX) is described as an average value of the amount of treated water (l / m 2 · hr) obtained per unit time per unit area of the hollow fiber membrane.

<Example 1>

It carried out based on FIG. 8 using the diffuser integrated hollow fiber membrane module of this invention. The amount of air provided was 0.8 m / hr per unit hollow fiber membrane area, and the size of the hole of the diffuser was 2.5 mm. The number of the air was 5 between the legs 6 and 6, and the total was 15 in one diffuser. . The amount of water treated by the separator is shown in Table 1 and FIG. 9.

Comparative Example 1

Using the same hollow fiber membrane module of the present invention was carried out as in Example 1 by mounting a separate circular diffuser under the module. The amount of water treated is shown in Table 1 and FIG. 9.

<Example 2>

The hole size of the diffuser of the diffuser-integrated hollow fiber membrane module was 2.5 mm, the number of holes between the legs 6 and 6 was 3, and the amount of air supplied was 1 m / hr per hollow fiber membrane area. . The amount of water treated is shown in Table 1 and FIG. 10.

<Example 3>

The hole size of the diffuser of the diffuser integrated hollow fiber membrane module was 2.5 mm, the number of holes between the bridge 6 and the bridge 6 was 3, and the amount of air supplied was 1.5 m / hr per hollow fiber membrane area. . The amount of water treated is shown in Table 1 and FIG. 10.

<Example 4>

In the diffuser integrated hollow fiber membrane module, one air or oxygen inlet was provided in the diffuser connecting rod, and the size of the air or oxygen generating hole was increased to be 0.5 to 2.5 mm as the distance from the inlet is increased. The number of air or oxygen generating holes was three between the legs 6 and 6, and nine were provided in one diffuser. The amount of air supplied was 1.5 m / hr per hollow fiber membrane area. The treated water amount is shown in Table 1.

TABLE 1

Size of air or oxygen generating hole (mm) Number of air or oxygen generating holes Air volume (m / hr) Treatment amount (ℓ / ㎡ · hr) Example 1 2.5 5 0.8 32.5 Example 2 2.5 3 1.0 31.0 Example 3 2.5 3 1.5 33.0 Example 4 0.5 to 2.5 3 1.5 33.5 Comparative Example 1 0.8 21.0

As described above, the diffuser-integrated hollow fiber separator of the present invention is a hollow fiber separator by air or oxygen droplets 17 generated in the air or oxygen generating holes 2 of the diffusers 1-a and 1-b. In the module (FIG. 6), the fouling phenomenon is minimized in filtering out the treated water in the bioreactor. That is, the air or oxygen droplets generated in the diffusers 1-a and 1-b cause the hollow fiber separation membrane 15 to be U-shaped in the diffuser to swing left and right, and also the rising air or oxygen droplets ( 17) is a long-term hollow fiber membrane is excellent as a result of the ventilation system (Fig. 7) ascending to the center, again passing through or passing through the hollow fiber membrane (15) to induce the diffusion of contaminants on the surface of the hollow fiber membrane It has the effect of maintaining the permeability.

Claims (16)

a) hollow fiber membrane (15), b) an air inlet (7-a), an air or oxygen generating hole (2) is formed, the diffuser (1-a, 1-b) in which the hollow fiber membrane (15) is hung in a U-shape, An undercarriage comprising a lower support and diffuser linkages 4-a, 4-b and legs 6 (FIG. 1), c) the upper hollow fiber membrane distribution structure (9) capable of dispersing the ends of the hollow fiber membrane (15) bundles, d) the head 12 sealing the hollow fiber membrane 15 and the upper hollow fiber membrane distribution structure 9, the filter 12 is provided with a discharge water (13) and e) diffuser-integrated hollow fiber membrane module comprising a support (8-a, 8-b) for connecting the upper hollow fiber membrane distribution structure (9) and the lower structure (Fig. 1). According to claim 1, wherein the diffuser (1-a, 1-b) is in the form of a square or a circle, the size of the air or oxygen generating hole (2) provided is 0.5 to 4 mm, the number of holes is a leg ( 6) and the diffuser-integrated hollow fiber membrane module, characterized in that consisting of two to eight between the bridge (6). The diffuser-integrated hollow fiber membrane module according to claim 2, wherein the spacing of air or oxygen generating holes (2) is 1 to 5 cm. The method of claim 1, wherein the hollow fiber separation membrane 15 is made of polyvinylidene fluoride, polysulfone, polysulfone, on the surface of the hollow fiber fibers composed of polypropylene (PP) and / or polyethylene (PE). The diffuser-integrated hollow fiber membrane module, characterized in that the tensile strength is more than 30,000 gf / fil is coated or coated with one or more polymers of polyethersulfone, PP and PE. 5. The diffuser-integrated hollow fiber membrane module according to claim 4, wherein the voids of the hollow fiber membranes (15) are 0.1 to 0.4 µm and the outer diameter is 1.5 to 2.5 mm. The diffuser-integrated hollow fiber membrane module according to claim 1, wherein the hollow fiber membrane membrane has a length of 0.5 to 1.5 m and a number of 500 to 2000 hollow fiber membranes of 5 to 15 m ² . The diffuser integrated hollow fiber membrane module according to claim 1 or 2, wherein the amount of air or oxygen supplied to the diffusers 1-a and 1-b is 0.5 to 3.5 m / hr per hollow fiber membrane area. . The air inlet according to claim 1, further comprising an air inlet (3-a, 3-b) which connects both ends of the diffuser (1-a) and the diffuser (1-b) to the substructure. The diffuser integrated hollow fiber membrane module, characterized in that provided at one or more places of the diffuser connecting rod. 2. The supporters 8-a and 8-b of claim 1, wherein the supports 8-a and 8-b have lower support insertion holes 5-a and 5-b and upper support insertion holes 10-a and 10-b of the upper hollow fiber membrane distribution structure. ), The support (8-a, 8-b) is a circular or oval, 1 to 3 cm in diameter, 0.2-1 m in length diffuser integrated hollow fiber membrane module. 2. The diffuser integrated type according to claim 1, wherein the hollow fiber membrane distribution holes of the upper hollow fiber membrane distribution structure 9 are 6-12, and the number of hollow fiber membranes filled per distribution hole is 100-300. Hollow fiber membrane module. The diffuser integrated hollow fiber membrane module according to claim 1, wherein the head (12) has a fixing groove for connecting and fixing the diffuser integrated hollow fiber membrane module to the frame. The diffuser-integrated hollow fiber membrane module according to claim 12, wherein two to four frame fixing grooves are provided. The diffuser-integrated hollow fiber membrane module according to claim 1, wherein the length of the substructure relative to the head portion sealing the hollow fiber membrane is the same, and the width is in the ratio of 1: 1 to 1: 2.5. 14. The diffuser-integrated hollow fiber membrane module according to claim 13, wherein the width of the substructure relative to the head portion sealing the hollow fiber membrane is trapezoidal in a ratio of 1: 1.5 to 1: 2.5. In using the diffuser-integrated hollow fiber membrane module of claim 1, the air or oxygen droplets (17) generated through the air or oxygen generating holes are disposed on the upper distribution structure and the lower structure (FIG. 1). Air or oxygen droplets 17 rising to the center rise to the outside and inside of the hollow fiber membrane and induce the diffusion of contaminants on the surface of the hollow fiber membrane to foul the hollow fiber membrane. Aeration system to minimize the ring. Air or oxygen droplets 17 are continuously provided through the air inlet 7-a of the air line and the module by the blower 24 for injecting air or oxygen, and the filtered water is discharged by the suction pump. Water treatment method using the diffuser integrated hollow fiber membrane module of claim 1.