KR101214439B1 - Immersed hollow fiber membrane module - Google Patents

Abstract

The present invention relates to an immersion type hollow fiber membrane module, by adopting a guide and a new structure air diffuser to protect the hollow fiber membrane, it is possible to prevent entanglement and breakage of the hollow fiber membrane, and to minimize contamination of the hollow fiber membrane The purpose is to provide a submerged hollow fiber membrane module.

The object of the present invention is the top end is a sealing end as a free end, the bottom end is a hollow fiber membrane bundle; A lower collector comprising an upper block on which a lower end of the hollow fiber membrane bundle is fixed by a fixing agent, and a lower block on which treated water discharged from the hollow fiber membrane is collected; Diffuser means formed on the upper block; An air supply pipe connected to the diffuser vertically; A treatment water discharge pipe connected to the inside of the lower block vertically; The immersion hollow fiber membrane module is characterized in that it comprises a guide surrounding the entire bundle of the hollow fiber membrane bundle and at the same time the lower end is coupled to the upper surface of the upper block.

Immersion hollow fiber membrane module, guide, diffuser means, lower collector, upper block, lower block

Description

Immersion hollow fiber membrane module

Figure 1a is a perspective view of the immersion hollow fiber membrane module according to the present invention,

Figure 1b is a perspective view showing another embodiment of the immersion hollow fiber membrane module according to the present invention,

2 is a perspective view illustrating a state in which the hollow fiber membrane module of FIG. 1 is arranged in a cassette in a plurality;

Figure 3a, 3b is an exploded perspective view showing a collector of the immersion hollow fiber membrane module according to the present invention,

Figure 4 is an assembled perspective view showing the collector of the immersion hollow fiber membrane module according to the present invention,

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a cross-sectional view taken along the line B-B of FIG.

7 is a cross-sectional view taken along the line C-C of FIG.

Figure 8 is a schematic diagram illustrating the action of inducing the cross-flow of the waste water by the diffuser of the immersion hollow fiber membrane module according to the present invention,

Figure 9 is a graph showing the film resistance value of the hollow fiber membrane with or without the guide adopted in the immersion hollow fiber membrane module of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 hollow fiber membrane 12 lower collector

14 guide 16: fixing agent

18: inlet 20: upper block

22: lower block 24: fixture

28: fastener 30: treated water discharge pipe

32: coupling end 34: air supply port

36: air supply line 38: air nozzle

40: air supply pipe 42: coupling groove

44: collecting passage 46: fitting groove

48: bolt 50: seal

52: cassette 54: air supply main pipe

56: final discharge pipe 58: leak prevention jaw

The present invention relates to an immersion type hollow fiber membrane module, and more specifically, by adopting a guide and a new structure air diffuser that can protect / support the hollow fiber membrane, to prevent entanglement and breakage of the hollow fiber membrane, It relates to an immersion hollow fiber membrane module that can minimize membrane fouling.

In the field of water treatment, sewage, and wastewater, the use of membranes has increased dramatically since the beginning of the 1960s, and the use of membranes so far separates the treated water primarily from the concept of advanced treatment. The purpose of this method is to obtain a better water quality by further separating the membrane process.

However, the conventional method is to arrange additional additional facilities in the water treatment plant, and has a disadvantage in that additional costs for installing, operating, and maintaining an additional facility (membrane process) are obtained, while obtaining good quality treated water. .

In view of this, based on the 1989 paper by "Kazuo Yamamoto et al.", "Direct Solid-Liquid Separation Using Hollow Fiber Membrane in an Activated Sludge Aeration Tank," Membrane BioReactor (MBR) has developed dramatically since the experiment of dipping to obtain treated water.

This MBR process maintains and operates a higher concentration of activated sludge (MLSS 8,000-15,000 ppm) than the existing activated sludge process, so that sewage can be treated within a short residence time in treating sewage. It is possible to reduce the space required for processing, and problems such as organic loading, bulking, foaming, etc. Even when the sedimentation property of the activated sludge is not good, there is an advantage to obtain a stable treated water.

However, the biggest problem that arises in the MBR process is the membrane fouling phenomenon (membrane fouling).

The membrane fouling phenomenon is caused mainly by the pressure difference of the driving force of the membrane, and activated sludge and other membrane contaminants in the reactor accumulate in the membrane surface or in the pores, thereby reducing the effective membrane surface area. It causes the problem of reduced quantity.

Thus, in order to reduce the contamination of the membrane, many researchers have been studied on the membrane material, and methods of physically inducing cross-flow on the membrane surface have been studied.

In addition, the research on the membrane material has been mainly in the direction of modifying the surface of the membrane hydrophilically using a surfactant or plasma (Plasma), the physical method is mainly used for physical effects, such as using air on the surface of the membrane Research has been conducted in the direction of inducing cross flow so as not to shake off or accumulate sludge cake accumulated on the film surface.

Here, the conventional hollow fiber membrane module for solving the membrane contamination is as follows.

The treated water collector is arranged on both sides (both ends of the hollow fiber membrane are fixed to both collectors), and in the case of Mitsubishi rayon or Zenon hollow fiber membrane module, the treated water is treated through a separator The water first collects on both collectors and is pumped to the treatment tank.

In this way, when the collectors for treating water are arranged at both ends, both ends of the hollow fiber membranes are fixed by being tied to each collector and the movement of the hollow fiber membranes due to air is limited, and air supply (hollowing In spite of the cross flow of the treated water by the surface of the desert or the physical shaking caused by the supplied air (vibrating the hollow fiber membrane), the accumulated contaminants on the surface of the hollow fiber membrane (separation membrane) are not easily removed. There is a disadvantage.

In particular, since the hollow fiber membrane modules of both companies are located at two locations (that is, where the highest pressure difference is caused) at the first to be affected by the decompression, there is a disadvantage in that a strong contaminant accumulation phenomenon that occurs at the location cannot be prevented.

In addition, in the case of the module by Zenon, the air supplied from the lower side does not completely escape through the collector on the upper part of the module while the activated sludge is floated, and the upper collector is caught and the flow is not smooth. There is a problem that can not be completely circulated, the contaminants accumulate on the surface of the membrane again due to the pressure difference in the location, and also the air diffuser is installed at the bottom of the module to transfer air directly to the hollow fiber membrane module There is a lot of air loss and additionally the amount of acid is added, according to the maintenance cost during operation, the power supply of the air supply accounted for more than 30 ~ 70% has a disadvantage of high operating costs.

In this way, membrane contamination (especially due to sludge cake) initiated in the module because of poor air supply continues to be transferred to areas with higher pressure differences, that is, less contaminants, resulting in hollow fiber membranes. This will contaminate the whole, and this phenomenon is uneconomical, leading to faster maintenance cleaning cycles, resulting in shorter lifespans of the hollow fiber membranes.

Here, the conventional hollow fiber membrane module for solving membrane contamination, that is, the type of treated water collector (Collector) is arranged on one side (one end of the hollow fiber membrane fixed to the collector, the other end is as follows).

The collector is arranged on only one side, and the purpose of the module may be different, but it is similar to the “Use of Sealed-end Hollow Fibers for Bubbleless Membrane Aeration: experimental studies” published by T. Ahmed et al. In 1992. Modules are disclosed.

In addition, JP11128692, filed by Toray, and JP10202270, filed by Kuraray, disclose modules of almost the same type as the modules used in the above-mentioned paper.

As shown above, a module in which a collector is arranged only on one side has a great difference in operation, productivity, and durability of the module, unlike a method in which collectors are arranged on both sides. There is a big disadvantage in the durability of the module because it can see a lot of phenomena that the sealing portion is cut during the actual operation, in particular, there is a disadvantage in that the effect of reducing the membrane fouling due to the lack of air supply.

In particular, the problem that is most easily found in the case of a module in which only one hollow fiber membrane is fixed is an abnormal flow in the fluid flow of the treated water due to the collapse of the hollow fiber membrane in the module or a different amount of air flow during operation. The hollow fiber membrane is tangled, and the physical stress due to abnormal flow is concentrated in the tangled portion, so that the tangled portion is broken or broken at the interface position with the fixative.

More specifically, when the hollow fiber membrane (separation membrane) in the module collapses, it may not occur during operation in the settling tank, but may easily occur when the hollow fiber membrane module is taken out of the aeration tank for maintenance, etc. If the hollow fiber membrane is entangled and broken, the level of the diffuser is not perfect during operation, resulting in a difference in the water pressure received by the diffuser. In many areas, the flow of fluid occurs in the lesser supply, and the hollow fiber membranes are oriented along the flow, causing entanglement.

In addition, when the hollow fiber membrane module is inclined to either side, the positions of the supplied air flow in contact with the module are different from each other, so that a certain pattern of fluid flow cannot be induced. Backlashing flow occurs and the hollow fiber membranes are entangled with each other, and in this tangled position, the physical stresses of the fluid flow are continuously received, and thus the hollow fiber membrane is cut off, or the overall stress is applied to the interface between the fixing agent and the hollow fiber membrane and thus the interface position. In this case, the hollow fiber membrane is cut.

The present invention has been researched and developed in order to solve the problems of the existing hollow fiber membrane module as described above, by adopting a guide that can protect the hollow fiber membrane, it is possible to prevent the phenomenon of tilting or entangled hollow fiber membrane, the guide itself The purpose of the present invention is to provide a submerged hollow fiber membrane module which adds a new structure air diffuser to minimize the surface contamination of the hollow fiber membrane with a small amount of air.

The present invention for achieving the above object is:

The upper end is sealed with a free end, and the lower end is a hollow fiber membrane bundle; A lower collector comprising an upper block on which a lower end of the hollow fiber membrane bundle is fixed by a fixing agent, and a lower block on which treated water discharged from the hollow fiber membrane is collected; Diffuser means formed on the upper block; An air supply pipe connected to the diffuser vertically; A treatment water discharge pipe connected to the inside of the lower block vertically; It provides an immersion type hollow fiber membrane module characterized in that it comprises a guide that is coupled to the upper surface of the upper block while protecting the entire hollow fiber membrane bundle.

In a preferred embodiment, the guide is a rectangular structure, the waste water inlet is formed through the front and rear surfaces of the lower side.

The upper block of the lower collector has a rectangular structure, a fastener for adhesively fixing the hollow fiber membrane bundle by a fixing agent is formed at the center of the upper surface, a fastener of the treated water discharge pipe is formed at one end thereof, and the bottom surface thereof. The coupling end coupled to the lower block is formed to protrude.

The lower block of the lower collector also has a rectangular structure, and a coupling groove for receiving the coupling end is formed on an upper surface thereof, and inside the coupling groove, a collecting passage for treated water discharged from the open lower end of the hollow fiber membrane bundle. Is formed deeper, one side end is formed with a fitting groove for receiving the treated water discharge pipe.

As a preferred embodiment, the diffuser means and the air supply port formed on the upper surface of one end of the upper block (opposite the fastener of the treated water discharge pipe) so that the lower end of the air supply pipe is inserted; An air supply line communicating with the air supply port and formed along front and rear edges of the fastener to which the hollow fiber membrane bundle is fixed; An injection hole of 45 ° to 65 ° angle to the hollow fiber membrane, and comprises a plurality of air nozzles formed at equal intervals in the air supply line.

The immersion hollow fiber membrane module as described above is arranged in a row in a cassette, which is a skeletal structure, in accordance with the capacity of the aeration tank.

Preferably, both sides of the upper end of the cassette are attached with an air supply main pipe which is in communication with the air supply pipe of each submerged hollow fiber membrane module and a final discharge pipe which is in communication with each treated water discharge pipe at the same time.

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

1A and 1B are perspective views illustrating an immersion type hollow fiber membrane module according to the present invention, and FIG. 2 is a perspective view illustrating a state in which a plurality of hollow fiber membrane modules of FIG. 1B are arranged in a cassette.

The present invention adopts a rectangular guide that can protect the hollow fiber membrane bundle in order to prevent the tilting and tangling of the hollow fiber membrane, and also by adding a new air diffuser to the lower collector with a small amount of air The main point is that the surface contamination of the hollow fiber membrane can be minimized.

The submerged hollow fiber membrane module of the present invention comprises a hollow fiber membrane 10, a lower collector 12, a guide 14 for protecting the hollow fiber membrane, and an air diffuser.

As shown in Figure 1a, the upper end of the individual hollow fiber membrane 10 is sealed as a free end, the lower end is in the form of an open tube, the lower end is collected in the bundle in the lower collector 12 It is fixed with the fixing agent 16: adhesive.

As another example, as shown in FIG. 1B, the entire upper end bundle of the hollow fiber membrane 10 may be sealed with a sealing material (adhesive).

In particular, the rectangular guide 14 is coupled to the lower collector 12, the hollow fiber membrane 10 bundle is embedded in the guide 14, the hollow fiber membrane 10 is tilted to one side It can be protected from losing, tangling and breaking.

That is, when the hollow fiber membrane 10 is inclined to one side by an external force (flow of air and wastewater), the hollow fiber membrane 10 is inclined to one side because the guide 14 of the rectangular shape plays a role of supporting it. In addition to losing, tangling and breaking (cutting) can be prevented.

On the other hand, the inlet 18 through which the waste water flows into the hollow fiber membrane bundle inside the front and rear surfaces of the lower end of the guide 14 is formed. At this time, the waste water inlet 18 in each hollow fiber membrane module is formed on both the front and rear of the lower guide 14 so that the waste water can be smoothly introduced into the guide (14). Since the wastewater inlet 18 is installed at both the front and the rear of the guide 14, as shown in FIG. 2, a plurality of hollow fiber membrane modules are arranged in a row in the cassette 52 while the hollow fiber membrane bundles are arranged in the lower collector 12. Even though the lower end of the guide 14 is fixed by the lower collector 12, the wastewater can be smoothly introduced into the guide 14 through the wastewater inlet 18. Forming the waste water inlet 18 in the lower and front and rear surface positions of the guide 14, the air discharged from the lower collector 12 by the lower diffuser means while protecting the hollow fiber membranes 10 and upwards and In the configuration of the present invention installed in the rectangular structure that can surround the hollow fiber membranes 10 as much as possible, the guide 14, which also performs a certain role of confinement, it is important to allow the waste water to smoothly flow into the guide 14 Play a role. In particular, a structure in which several hollow fiber membrane modules are arranged in a row in the cassette 52, a structure in which the guide 14 surrounds the hollow fiber membranes 10 as much as possible, and the lower collector 12 and the guide 14 are coupled to each other. Considering that the lower end of the guide 14 is closed, it is preferable that the waste water inlet 18 is formed at the lower portion of the guide 14 (the upper end of the guide is open) and the front and rear positions, and is advantageous and advantageous for the waste water inflow. It's a structure.

Here, look at the configuration of the lower collector containing the diffuser as follows.

3A and 3B are separate perspective views illustrating a collector of the immersion hollow fiber membrane module according to the present invention, and FIG. 4 is an assembled perspective view.

The lower collector 12 has an upper block 20 at which a lower end of the bundle of hollow fiber membranes 10 is fixed with a fixing agent 16, and a lower block at which treated water discharged from a lower end of the hollow fiber membrane 10 is collected ( 22).

The upper block 20 of the lower collector 12 is a rectangular block structure, the rectangular fastener 24 is formed in the center of the upper surface of the hollow fiber membrane 10 bundle is adhesively fixed by the fixing agent 16 At one end, a fastener 28 through which the treated water discharge pipe 30 is inserted and formed is penetrated, and a coupling end 32 coupled to the lower block 22 is protruded from the bottom thereof. The coupling end 32 has a structure in which the inside thereof communicates with the fixture 24 into which the lower end of the hollow fiber membrane bundle is put.

On the inner circumferential surface of the fastener 24, a leak prevention jaw 58 for preventing a leak during contraction of the fastener 16 is formed stepwise.

Therefore, the lower end of the bundle of the hollow fiber membrane 10 is adhesively fixed by molding the adhesive 24 to the fixture 24 of the upper block 20, and then the hollow fiber membrane 10 protruding downward through the fixture 24. By cutting the lower end of the bundle together with the fixing agent, the lower end of the bundle of the hollow fiber membrane 10 is arranged in parallel with the coupling end 32 and is in an open state.

In addition, the upper block 20 is provided with an air dispersing means, the air supply port 34 is formed through the upper surface of one side end of the upper block 20 (opposite the fastener 28 of the treated water discharge pipe), Two rows of air supply lines 36 are formed along the inside of the front and rear edges of the fastener 24 to which the hollow fiber membrane 10 bundle is fixed while being in communication with the air supply port 34, wherein the air supply line 36 is formed. A plurality of air nozzles 38 formed at equal intervals are formed, so that the diffuser means of the present invention, that is, the air supply path, is achieved.

At this time, the air nozzle 38 is formed by the injection hole of about 45 ° to 65 ° angle with respect to the bundle of the hollow fiber membrane (10).

On the other hand, the lower end of the air supply pipe 40 is inserted into the air supply port 34 of the upper block 20, the lower end of the treated water discharge pipe 30 is inserted into the fastener 28 formed on the opposite side. When the air supply pipe 40 and the treated water discharge pipe 30 are fastened vertically, the air supply pipe 40 and the treated water discharge pipe 30 are vertically embedded at both ends of the guide 14 and extend upward from the upper end of the guide 14.

The lower block 22 of the lower collector 12 has a rectangular structure that is integrally coupled to the bottom of the upper block 20, and the coupling end 32 formed on the bottom of the upper block 20 on the upper surface thereof. A coupling groove 42 is formed to be inserted and received, and the collection passage 44 of the treated water discharged from the open lower end of the bundle of the hollow fiber membrane 10 is formed deeper into the coupling groove 42, and one side thereof. The end is provided with a structure in which the fitting groove 46 further accommodates the lower end of the treated water discharge pipe 30.

Therefore, the coupling end 32 of the upper block 20 is inserted and seated in the coupling groove 42 of the lower block 22, and then formed along the edges of the upper block 20 and the lower block 22. By fastening the bolt 48 to the bolt fastening groove of the upper block 20 and the lower block 22 is assembled, and the lower end of the bundle of hollow fiber membrane 10 cut in parallel with the coupling end 32 The end (open state) is in a state of communicating with the treated water collecting passage 44 of the lower block 22. As such, the upper block and the lower block are separated from each other and are assembled by bolts to form an integral lower collector. Particularly, in the state where the upper block and the lower block are separated, the treated water collecting passage of the lower block is moved to the outside. It has a structure that can be exposed.

On the other hand, the sealing seal 50 of the rubber material is arranged on the upper surface of the lower block 22 coupled to the upper block 20, that is, the outer groove of the coupling groove 42, the collecting passage 44 of the lower block 22 Leakage of the treated water collected in

On the other hand, the immersed hollow fiber membrane module as described above may be arranged in a row in a cassette 52 made of a skeleton structure of steel as shown in Figure 2 attached to the capacity of the aeration tank.

At this time, an upper end of the air supply pipe 40 of each submerged hollow fiber membrane module is attached to one of the upper end of the cassette 52, the air supply main pipe 54 is attached, and the upper end of the cassette 52 The other end is attached to the final discharge pipe 56, the upper end of the treated water discharge pipe 30 of each submerged hollow fiber membrane module is combined.

Of course, the air supply main pipe 54 is connected to the air supply means (not shown), and the final discharge pipe 56 is connected to the place where the treated water is collected or after-treatment.

Here, the operational state of the immersion hollow fiber membrane module of the present invention will be described.

First, a cassette 52 in which several immersed hollow fiber membrane modules are arranged in an aeration tank (not shown) filled with waste water is immersed.

Thus, the waste water in the aeration tank is filled into the hollow fiber membrane 10 through the inlet 18 of the guide 14, and at the same time the waste water is filtered and passed through the inside of the hollow fiber membrane 10 by external pressure.

For example, the hollow fiber membrane 10 is a tube structure having an outer diameter of 0.2 to 4.2 mm and an inner diameter of 0.05 to 4.1 mm using polysulfone, sulfonated polysulfone, polyether sulfone, polyvinylidene fluoride, and the like. A number of pores are formed that are too minute to be visually discernible.

Therefore, the waste water is filtered from the outside of the hollow fiber membrane 10 to the inside, and the filtration action of the waste water passing through is made.

The filtered water thus flows downward through the inside of the hollow fiber membrane 10 and is collected in the treated water collecting passage 44 of the lower block 22 of the lower collector 12.

Subsequently, the treated water collected into the treated water collecting passage 44 of the lower block 22 as shown in FIG. 7 is inserted into the fitting groove 46 of the lower block 22. The water is discharged through the 30, and subsequently the treated water flows to the post process or the water collecting facility through the final discharge pipe 56 in which the treated water discharge pipes 30 of each hollow fiber membrane module are combined into one.

At the same time as the filtration of the waste water, the membrane surface of the hollow fiber membrane is a membrane contamination by the sludge cake (sludge cake), especially by the filtered foreign matter (cold matter, cake, clogging), such a In order to prevent membrane fouling, foreign matter removal (dropping) is performed by the air diffuser.

Here, looking at the foreign matter removal effect by the acid device of the present invention.

According to the present invention, by spraying air toward the membrane surface of the hollow fiber membrane 10, foreign substances such as sludge cake can be eliminated, and in particular, the cross-flow of waste water is induced by the injected air, thereby accumulating on the membrane surface. The sludge cake will not accumulate.

First, air is supplied to the air supply pipe 40 of each hollow fiber membrane module through the air supply main pipe 54 attached to the upper end side of the cassette 14 (see FIG. 5).

Subsequently, the air is supplied to the air supply line 36 in a two-row array through the air supply port 34 of the upper block 20, and finally, the air nozzles are formed at equal intervals in the air supply line 36. (38: injection hole at an angle of about 45 ° to 65 ° to the hollow fiber membrane) (see Fig. 6).

That is, the air is evenly sprayed at the front and rear positions of the lower end of the bundle of the hollow fiber membrane 10, thereby easily removing the film surface contaminants of the hollow fiber membrane 10 even with a small amount of air.

Therefore, the film surface of the hollow fiber membrane 10 is generated by the air pressure injected through the air nozzle 38 and by the injected air, and then scrubbed and vibrated by the continuously rising bubbles. Foreign substances such as sludge cake accumulated in the drop-out is removed, thereby filtration of the hollow fiber membrane 10 can be maintained continuously.

In particular, as shown in the accompanying FIG. 8, the waste water is filtered by acting in a vertical (left and right) flow with respect to the hollow fiber membrane 10, while the air and bubbles generated by the air rise upwards. It acts to eliminate foreign substances on the surface of the membrane.

More specifically, the filtration direction of the waste water to the hollow fiber membrane 10 and the rising direction of the bubbles by the air has a cross flow, the cross flow is foreign matter accumulated on the membrane surface of the hollow fiber membrane 10 It acts to drop off in real time, further minimizing the membrane fouling of the hollow fiber membrane.

On the other hand, the existing technologies have the hollow fiber membrane collapsed or entangled the hollow fiber membrane due to the abnormal flow of waste water and different air flow during operation, the hollow fiber membrane is eventually cut, but according to the present invention the hollow fiber membrane ( 10) Since the bundle is arranged in the guide 14 of the rectangular shape, the phenomenon in which the hollow fiber membrane 10 falls or tangles to one side does not occur at all.

That is, even if the physical stress due to the abnormal flow is concentrated on the hollow fiber membrane 10, the rectangular guide 14 is to support the function, so the hollow fiber membrane is erected vertically without tilting or tangling to one side. Will be maintained.

Such immersed hollow fiber membrane module of the present invention has almost no damage to the hollow fiber membrane compared to the existing technology, as a result of Experimental Examples 1 and 2 below, the air supply amount is reduced to 1/3, 30 ~ 70 in terms of operating maintenance costs It was found that there is a% energy reduction effect.

Experimental Example 1

In order to find out the air supply amount by the diffuser means of the submerged hollow fiber membrane module according to the present invention, and the air supply amount by the diffuser means of the existing hollow fiber membrane module, the following experiment was performed.

At activated sludge microbial concentration (MLSS 8,000), the flux (throughput) of each module of the present invention, the company M and the company Z was fixed at 25 LMH (L / m ² / hr) and the hollow fiber membrane area of each module was 1 m ^2. It was set as.

Subsequently, the operation cycle was backwashed for 1 minute at 14 minutes, and the optimum air amount was measured while changing the air flow rate until there was no minimum pressure change and flow rate change by the fixed flow rate operation by the inverter.

As a result, as shown in Table 1 below, the air supply amount of the present invention, which can prevent membrane fouling, is 0.08 Nm ³ / min module, and it can be seen that the air supply amount can be reduced by 1/3 compared to the conventional technology. Could.

Experimental Example 2

As an experiment to determine the maintenance cost per ton for the immersion type hollow fiber membrane module of the present invention and the existing hollow fiber membrane module, the present invention and M company, Z company measured the maintenance cost per ton of the sewage treatment plant applied MBR actually.

In addition, since 30% or more of the power portion represents the blower power ratio due to the air supply of the hollow fiber membrane module, a large portion of the maintenance ratio is occupied by the module air supply.

Therefore, as shown in Table 2 below, it can be seen that the maintenance cost per ton of the present invention can be reduced by about 40% or more compared to the existing technology.

Experimental Example 3

The degree of membrane fouling of the hollow fiber membranes according to the presence or absence of a guide of a rectangular body adopted in the submerged hollow fiber membrane module according to the present invention was measured, and the results are shown in the graph of FIG. 9.

Referring to FIG. 9, it could be seen that the difference in membrane resistance was more than two times according to the presence or absence of the guide, and in the absence of the guide, the air loss was large and the membrane contamination was accelerated to increase the membrane resistance.

As a result, the guide adopted in the submerged hollow fiber membrane module of the present invention prevents air loss and entanglement of the hollow fiber membrane, and at the same time prevents air loss, so that the membrane resistance of the hollow fiber membrane is almost equivalent to the initial value. It can be seen that the membrane fouling of the hollow fiber membrane can be minimized.

As seen above, the immersion hollow fiber membrane module according to the present invention provides the following excellent effects.

1) Air is supplied to both sides through the diffuser means (apparatus) configured inside the lower collector to easily remove and remove membrane contaminants (clumps, cakes, clogging) of the hollow fiber membrane, so that the existing hollow fiber membrane module It can fundamentally solve the problems of entanglement and cleavage of membranes and membrane contamination.

2) The air supply by the air diffuser of the present invention causes cross flow-like water flow in the guide, prevents air from counting outside, and speeds up the flow rate in the guide, thereby providing a film surface of the hollow fiber membrane. It is very excellent in the effect that can prevent the accumulation of foreign matter.

3) Although the upper end of the hollow fiber membrane of the present invention is arranged in the free end through the individual sealing (blocking), it can prevent the phenomenon such as tilting or tangling to one side by the protection and support action of the guide.

4) The hollow fiber membrane module of the present invention has a rectangular structure arranged at the same time to facilitate the large-capacity, each module has a narrow gap, it can be made in a compact system with a smaller installation area than the conventional immersion type commercialized module.

5) The hollow fiber membrane module of the present invention can check whether the membrane is broken during operation, which can be connected to the treated water pipe of the hollow fiber membrane module air to check whether the hollow fiber membrane is damaged by pressure changes and visual inspection.

6) The submerged hollow fiber membrane module of the present invention can reduce the amount of air supplied by 1/3 compared to the conventional submerged hollow fiber membrane module, and has an energy reduction effect of 30 to 70% in terms of operation maintenance management cost.

Claims (7)

In the submerged hollow fiber membrane module, The upper end is sealed with a free end, and the lower end is a hollow fiber membrane bundle; A lower collector comprising an upper block on which a lower end of the hollow fiber membrane bundle is fixed by a fixing agent, and a lower block on which treated water discharged from the hollow fiber membrane is collected; Diffuser means formed on the upper block; An air supply pipe connected to the diffuser vertically; A treatment water discharge pipe connected to the inside of the lower block vertically; Surrounding and protecting the entire bundle of the hollow fiber membrane, the lower end is configured to include a guide coupled to the upper surface of the upper block, The guide has a rectangular structure in which wastewater inlets are formed in the front and rear surfaces of the lower side, and the lower collector has an upper block and a lower block so as to be separated, and the upper block and the lower block are assembled by bolting to each other. Consisting of, wherein the submerged hollow fiber membrane module, characterized in that the collection block of the treated water formed in the lower block is exposed in the state that the upper block and the lower block is separated. delete The method according to claim 1, The upper block of the lower collector has a rectangular structure, a fastener for adhesively fixing the hollow fiber membrane bundle by a fixing agent is formed at the center of the upper surface, a fastener of the treated water discharge pipe is formed at one end thereof, and the bottom surface thereof. The submerged hollow fiber membrane module is characterized in that the lower end of the hollow fiber membrane bundle is communicated with the fixture is coupled to the coupling end coupled to the lower block is formed. The method according to claim 1, The lower block of the lower collector has a rectangular structure, the upper surface of which is formed in communication with the fixture of the upper block into which the lower end of the hollow fiber membrane bundle is inserted, and at the same time a coupling groove is formed to receive the coupling end protruding from the lower surface of the upper block. The inside of the coupling groove is formed in the collecting passage of the treated water discharged from the open lower end of the hollow fiber membrane bundle deeper, characterized in that the one side end is formed with a fitting groove for receiving the treated water discharge pipe Immersion hollow fiber membrane module. The method according to claim 1, wherein the diffuser means: An air supply port formed on an upper surface of one end of the upper block (opposite to a fastener of the treated water discharge pipe) so that the lower end of the air supply pipe is inserted and fastened; An air supply line communicating with the air supply port and formed along front and rear edges of the fastener to which the hollow fiber membrane bundle is fixed; Immersion hollow fiber membrane module comprising a plurality of air nozzles formed at equal intervals in the air supply line as the injection hole of 45 ° to 60 ° angle to the hollow fiber membrane. The method according to claim 1, 3, 4 or 5, Immersion hollow fiber membrane module, characterized in that several arranged in a row in the cassette, the skeletal structure according to the capacity of the aeration tank. The method of claim 6, An immersion hollow fiber membrane module, characterized in that the air supply pipe and the treated water discharge pipe is connected to each of the air supply main pipe and the final discharge pipe attached to both sides of the upper end of the cassette.

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