KR20220140353A - Pre-filter module to prevent contamination of submerged membrane module - Google Patents

Abstract

The present invention relates to a pre-filter module to prevent contamination of a submerged separation film module, and more specifically, to a pre-filter module which is disposed outside a submerged separation film module to prevent impurities or contaminants from flowing into the separation film module. The pre-filter module comprises: an installation frame installed outside the separation film module; a filter unit including a support frame and a filter net installed on the support frame to filter out impurities or contaminants flowing into the separation film module; and an inlet/outlet part formed on the installation frame to enable insertion and discharge of the filter unit. That is, the present invention suggests a pre-filter module to prevent contamination of a submerged separation film module, in which a pre-filter module having a pre-processing function is installed around a separation film module to filter out impurities or contaminants flowing into the separation film module, thereby preventing contamination. Through this, the membrane permeability of the separation film module can be maintained, a lifespan of a film extends, and replacement costs incurred by damage can be reduced.

Description

Pre-filter module to prevent contamination of submerged membrane module

The present invention prevents contamination by filtering contaminants or contaminants flowing into the separation membrane module by installing a pre-filter module having a pre-treatment function in the vicinity of the separation membrane module, thereby maintaining the membrane permeability of the separation membrane module, as well as maintaining the life of the membrane It relates to a pre-filter module for preventing contamination of an immersion-type membrane module that can reduce replacement costs due to extension and damage.

The submerged membrane module commonly used in sewage treatment plants is an MBR (Membrane Biological Reactor) that immerses the membrane device in the aeration tank of the bioreactor. It is miniaturized, completely removed from solids, effluent sterilized, high-concentration suspended solids operation, long solids retention time, and sludge Although there are advantages such as low production and non-occurrence of sludge bulking, there is a major disadvantage of membrane contamination.

Membrane contamination is a common phenomenon in most membrane processes, and in general, physical phenomena due to pore clogging can be divided into four major categories.

First, adsorption is a factor that makes all pores small, and a pore plugging phenomenon occurs in the small pores. Second, it is a case in which small particles block the pores rather than adsorption itself. The structure of the pores is conical, so there are many substrates for these small particles to get in. If the pore diameter is very large, the clogging phenomenon may be reduced. Third, an adhesion layer is formed on the surface of the film, and chemical bonding through the layer occurs as a reversible and irreversible reaction, and deposition on the film surface ultimately forms a cake layer. There may be a phenomenon of natural reduction. Finally, it is a case in which particles larger than the pore diameter block the relatively large pore size and the small pore size hole remains as it is, thereby reducing the overall pore distribution. Since such a case can occur naturally in the membrane process, equipment management and pretreatment are important.

On the other hand, foreign substances (hair, fibers, etc.) contained in sewage and wastewater are directly agglomerated on the hollow fiber membrane by the flow of fluid or the flow of cleaning air supplied to prevent contamination of the separation membrane, causing the separation membrane to break. There are many cases where it cannot be used by itself.

In addition, membrane agglomeration shortens the membrane cleaning cycle and applies a greater amount of physical force (overpressure watering, direct separation, etc.) to the membrane to remove foreign substances during membrane cleaning, which may shorten the life of the membrane and cause damage. . In addition, it appears that studies on preventing membrane contamination by foreign substances such as shortening the replacement cycle of membrane modules and worsening the quality of treated water are still insufficient.

Foreign substances cannot be completely removed with the pre-treatment process applied to the current sewage and wastewater treatment plants (such as sedimentation paper, coarse and fine screen). For this reason, a more thorough pretreatment process for protecting the submerged membrane module is required.

Republic of Korea Patent No. 10-1402197 (Registered on May 26, 2014)

The present invention has been devised to solve the problems as described above,

By installing a pre-filter module with a pre-treatment function around the separation membrane module, it prevents contamination by filtering out contaminants or contaminants flowing into the separation membrane module. One purpose is to reduce the replacement cost due to

Another object of the present invention is to ensure the convenience of replacement and installation of the filter unit, which is a consumable, by enabling the cartridge-type filter unit in the pre-filter module to be inserted and discharged in a slide manner into the inlet and outlet arranged in multiple stages on the installation frame. for the purpose of

Another object of the present invention is to prevent damage to the separation membrane module from the pre-filter module by the differential pressure generated in the separation tank by installing a protective net or a safety bar on the installation frame.

In the pre-filter module for preventing contamination of the submerged membrane module according to the present invention, the pre-filter module is disposed on the outside of the submerged membrane module to prevent the inflow of contaminants or contaminants into the separation membrane module. installed frame; a filter unit comprising a support frame and a filter network installed on the support frame to filter out contaminants or contaminants flowing into the separation membrane module; And it is formed on the installation frame to enable insertion and discharge of the filter unit;

The installation frame according to the present invention is composed of a front frame, a rear frame, a side frame and a floor frame, and the lead-in/out portion is made of a pair and is arranged in a plurality on the front, rear, both sides and the floor frame of the installation frame, The filter unit is manufactured in the form of a cartridge and is configured to be inserted and discharged in both directions with respect to each of the plurality of inlet and outlet portions.

The front, rear, both sides and the bottom frame of the installation frame according to the present invention is characterized in that the protection net is further provided on the inside or outside, or on the inside and outside.

The front, rear, and side frames of the installation frame according to the present invention are characterized in that the safety bar is further provided in the inward direction.

The support frame of the filter unit and the inlet/out portion of the filter unit according to the present invention may further include coupling means for fixing and detaching the filter unit to the in/out portion.

The coupling means according to the present invention comprises a first coupling hole formed in the lead-in/out portion, and a second coupling hole formed in the support frame of the filter unit and corresponding to the first coupling hole, wherein the coupling means comprises: It characterized in that it further comprises a coupling bolt fastened to the first and second coupling holes.

In order to remove foreign substances attached to the filter network of the filter unit according to the present invention, a removal means for spraying a high-pressure fluid to the filter network is further provided, wherein the removal means includes a unit flow rate passing through the filter network at a set flow rate If it is less than, it is characterized in that it is driven by the control unit.

The filter network of the filter unit according to the present invention is composed of a mesh network in the form of agglomeration in a double-membrane structure, and the filter network is made of polypropylene material and is characterized in that it is made of 200 denier.

The pre-filter module for preventing contamination of the submerged separation membrane module according to the present invention prevents contamination by installing a pre-filter module having a pre-treatment function around the separation membrane module to filter out contaminants or contaminants flowing into the separation membrane module, and through this It is possible not only to maintain the membrane permeability of the separation membrane module, but also to extend the life of the membrane and reduce the replacement cost due to damage.

In addition, in the present invention, the cartridge-type filter unit in the pre-filter module can be inserted and discharged in a slide manner to the inlet/outlet disposed in a plurality of stages in the installation frame, thereby guaranteeing the convenience of replacement and installation of the filter unit, which is a consumable item.

In addition, the present invention can prevent damage to the separation membrane module from the pre-filter module by the differential pressure generated in the separation tank by installing a protective net or a safety bar on the installation frame.

In addition, the present invention can improve the durability of the product because the filter unit inserted and discharged to the inlet and outlet formed in the installation frame can be firmly fixed on the installation frame by the coupling means.

1 is a perspective view showing a pre-filter module for preventing contamination of an immersion-type separation membrane module according to the present invention;
2 is an exploded perspective view showing a pre-filter module according to the present invention;
3 is an operation diagram showing the operating state of the filter unit of the pre-filter module according to the present invention;
4 is an enlarged view showing 'A' of FIG. 1;
5 is a front view showing a protective net and a safety bar mounted on the installation frame according to the present invention,
6 is a photograph showing a filter network of a pre-filter module according to the present invention and a conventional filter network;
7 and 8 are graphs showing test results for the filter network of FIG. 6;

In order to explain the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, preferred embodiments of the present invention will be exemplified below and will be described with reference to them.

First, the terms used in the present application are used only to describe specific embodiments, and are not intended to limit the present invention, and the singular expression may include a plural expression unless the context clearly indicates otherwise. In addition, in this application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other It is to be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.

In describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 to 4, the pre-filter module for preventing contamination of the submerged membrane module according to the present invention is a filter unit ( 20) and a lead-in/out portion 30 .

First, the submerged membrane module according to the present invention is an MBR for immersing the membrane device in a bioreactor. It is miniaturized, completely removed, effluent sterilization, high-concentration suspended solids operation, long solids residence time, low sludge production, and no sludge bulking phenomenon. Although there are advantages such as, there is a major disadvantage of membrane contamination.

In this regard, the pretreatment process (sampling paper, milling and fine screen, etc.) applied to the existing sewage and wastewater treatment plants to solve the problems mentioned in the background art cannot completely remove foreign substances, but also In a wastewater treatment plant, there is a need for a pretreatment process for more thorough protection of the submerged membrane module in order to reduce the replacement cost of the membrane that accounts for more than 50% of the operating cost, and the present invention is proposed to provide a solution to this.

Therefore, hereinafter, the pre-filter module will be described in more detail with reference to the accompanying drawings in order to prevent contamination of the submerged membrane module according to the present invention.

1 to 4, the installation frame 10 according to the present invention is installed outside the separation membrane module and functions as a structure on which the filter unit 20 is mounted.

The installation frame 10 is made of a substantially hexahedral structure, and constitutes the front and rear frames 11 and 12, the side frames 13 connected to the front and rear frames 11 and 12, and the bottom of the structure. It is composed of a bottom frame (14). That is, after the installation frame 10 is installed with a frame structure, each side except the upper surface in the hexahedron, that is, the front, rear, side and bottom frames 11, 12, 13, and 14 of the frame structure Each is fastened to the structure in the same way as welding or bolting.

In this case, as shown in Figs. 1 and 2, the front, rear and side frames 11, 12, and 13 of the installation frame 10 are each divided into three parts in the vertical direction, and divided into two parts in the horizontal direction. It is configured so that each of the six filter units 20 can be mounted on each frame.

In addition, as shown in Fig. 2, the bottom frame 14 of the installation frame 10 is partitioned in the horizontal direction and the vertical direction, respectively, so that four filter units 20 can be mounted thereon.

However, as described above, the division on each frame of the installation frame 10 can be increased or decreased as needed.

An accommodating space is formed inside the installation frame 10 configured as described above, and the separation membrane module may be installed in the accommodating space. However, when the separation membrane module is installed in the field, it is also possible to install it in a form in which each frame structure of the installation frame 10 is combined and fixed.

1 to 4, the filter unit 20 according to the present invention serves to primarily filter contaminants or contaminants as a pretreatment for preventing membrane contamination of the separation membrane module as described above. .

To this end, the filter unit 20 includes a support frame 21 and a filter network 23 installed on the support frame 21 to primarily filter contaminants or contaminants flowing into the separation membrane module.

That is, the support frame 21 of the filter unit 20 is made of a rectangular frame made of aluminum and serves to firmly support the filter network 23 . In this case, it is desirable to secure a uniform support force by binding the support frame 21 and the filter net 23 using a rubber ring, which is to allow the filter net 23 to withstand the differential pressure ( The effect of the differential pressure in the separation tank will be described in detail in the section describing the protection net 40 and the safety bar 50 provided in the installation frame 10).

The pre-filter module (PF) according to the present invention is installed on the outer end face of the existing separation membrane module to block the inflow of contaminants or contaminants. Therefore, the permeability of the pre-filter module (PF) becomes a very important driving factor.

Therefore, hereinafter, the results of experiments using two filters with respect to the permeation performance of the filter network 23 of the filter unit 20 will be described.

To this end, a filtration experiment to evaluate the permeability of the pre-filter module (PF) was performed by cutting two types of filters 4.7 cm in size and applying an operating transmittance of about 9.6 L/min/m 2 . In the separation membrane module that is actually operated, aeration for membrane permeation is performed, but in the filtration experiment conducted in the laboratory, it is dead without aeration condition for filter cleaning in order to prevent the experimental time from being prolonged when aeration is applied and to evaluate the filter performance under the worst conditions. The filtration experiment was carried out in the -end method. The permeate used in the filtration experiment was MLSS from the membrane separation tank of the S sewage treatment plant, and the concentration was about 12,000 mg/L.

The following [Table 1] is a mesh network (filter 1) comprising a double membrane agglomerated structure according to the present invention shown in FIG. This is a comparison of the specifications for the network (filter 2).

Item filter 1 filter 2 1. Material PP PP 2. Form mash mesh 3. Denier 200 400 4. Color black white 5. Weight (g/m ² ) 105 155 6. Thickness (mm) about 0.2 about 0.3

7 is a graph showing the results of a filtration experiment for filter 1 and filter 2; The inflow flow rate was 9.6 L/min/m2, which is the actual operating flow rate, and the flow rate (12 mL/min) corresponding to the filter area used in the experiment was applied. 'Filter 1' showed stable filtration performance for a longer period of time, with 'Filter 1' and 'Filter 2' taking 35 minutes for the same inflow and permeate flow rates. In addition, the permeate flow rate decreased due to clogging of the filter paper, and the final occlusion period was found to be about 10 minutes for 'Filter 1' and 5 minutes for 'Filter 2'.

From the above results, compared to 'Filter 1', 'Filter 2' was occluded within a short period of time and showed a tendency to abruptly decrease the transmission rate when occlusion occurred. Therefore, as a result of this experiment, 'Filter 1', which showed relatively stable filtration performance, was selected as the material of the filter network 23 of the filter unit 20 according to the present invention, and a linear foreign matter removal characteristic analysis and a full-scale pre-filter module were manufactured and applied. .

Based on the above results, the filter network 23 of the filter unit 20 according to the present invention is made of a mesh network in the form of agglomeration in a double-membrane structure, and is specified as a material having 200 denier as a polypropylene material.

Also, based on the above results, FIG. 8 is a result of analyzing the filtration characteristics when 50% (6 mL/min) and 200% (24 mL/min) of the actual operating flow rate (12 mL/min) are applied to Filter 1.

The graph (a) of FIG. 8 shows that the permeate flow rate slightly decreased after 50 minutes when operated at 50% of the actual operating flow rate, but did not continuously decrease and a constant permeate flow rate was stably maintained. On the other hand, in the graph of FIG. 8 (b), when the operation was performed at 200% of the operating flow, a decrease in the permeate flow was observed from about 5 minutes after the start of the operation, and then a sharp decrease in the flow rate appeared and completely blocked after 7 minutes. tWhen the pre-filter is installed and operated in the actual separation membrane module, the replacement and cleaning time of the pre-filter is shortened depending on the high concentration and the amount of contaminants. It was concluded that it was necessary to establish cleaning standards.

Since the pre-filter module according to the present invention configured as described above affects the permeation performance when the contaminants or contaminants filtered by the filter network 23 of the filter unit 20, or these substances are adhered, periodically As a result, it is necessary to wash or clean the filter network 23 or perform a replacement operation.

To this end, it is necessary to facilitate replacement and maintenance of the filter unit 20 .

For replacement and maintenance of the filter unit, the installation frame 10 on which the filter unit 20 is mounted is taken out of the separation tank, or, if necessary, after all the fluid inside the separation tank is discharged, the filter unit is placed on the filter unit. replacement and maintenance work.

In this case, in the present invention, the inlet/outlet portion 30 of the installation frame 10 is introduced to facilitate replacement and maintenance of the filter unit 20, which will be described below.

1 to 4, the lead-in/out part 30 according to the present invention is formed in the installation frame 10 to easily insert and combine the filter unit 20 without taking out the installation frame 10 to the outside, Separate discharge is possible.

The lead-in/out part 30 according to the present invention is made of a pair and is arranged in plurality in the front, rear, both sides and the bottom frame 14 of the installation frame 10 . The lead-in portion 30 is provided with a slide member 31 formed with a 'C'-shaped insertion groove 33 to vertically correspond to the vertical partition in the front, rear and side frames 13 of the installation frame 10 . installed as much as possible. Accordingly, the filter unit 20 may be coupled through the insertion groove 33 in both directions of the slide member 31 at each end on each frame through a sliding operation. Conversely, when discharging, the filter unit 20 may be discharged from the insertion groove 33 from both directions.

In addition, the lead-in/out portion 30 disposed on the bottom frame 14 is mounted so that the slide member 31 corresponds to the horizontal or vertical partitioning portion, and even in this case, the filter unit 20 is inserted into the insertion groove ( 33) through a slide operation to enable insertion and extraction.

The lead-in/out unit 30 configured as described above inserts the filter unit 20 from both directions in the separation tank even without taking out the installation frame 10 to the outside when replacing or maintaining the filter unit 20, By enabling the discharge, it is possible to easily and easily perform a replacement operation of the filter unit 20, a maintenance operation, and the like.

In this case, when the filter unit 20, which is a consumable, is manufactured in the form of a cartridge, the filter unit 20 is installed easily, conveniently, and quickly by the inlet/outlet part 30 when performing operations such as replacement of a plurality of filter units 20. (10) It is possible to improve the work efficiency in that it can be inserted and combined and separated and discharged.

On the other hand, in general, in the membrane filtration process, the influent is introduced into the separation tank through pretreatment, and is blown to the bottom of the filtration membrane for cleaning and sludge activity. As more than a certain amount of air is blown, natural agitation is achieved, and thus the contaminated influent is treated cleanly using a filtration pump. By repeating suction and pause of the filtration membrane, the load of filtration and equipment is kept constant, and backwashing through differential pressure management is also performed periodically.

Therefore, the installation frame 10 and the filter unit 20 installed in the separation tank need to be designed in consideration of the influence of the differential pressure as described above.

To this end, in the present invention, a coupling means 60 is introduced so that the filter unit 20 can be firmly coupled to the installation frame 10 (or the inlet/outlet part 30 ).

The coupling means 60 includes a first coupling hole 61 formed in the slide member 31 of the lead-in/out part 30 and a first coupling hole 61 formed in the support frame 21 of the filter unit 20 . It is configured to include a second coupling hole 63 corresponding to the. In addition, the coupling means 60 is composed of coupling bolts 65 fastened to the first and second coupling holes 61 and 63 . That is, after inserting the filter unit 20 into the lead-in/out part 30 , the coupling bolts are inserted into the first and second coupling holes 61 and 63 formed at positions corresponding to the slide member 31 and the support frame 21 . By fastening (65) so that the filter unit 20 can be firmly fixed and supported, the filter unit 20 is separated from the installation frame 10 or the inlet/outlet part 30 when a differential pressure occurs in the separation tank. and, through this, it is possible to protect the separation membrane module.

In addition, as shown in Fig. 5, the front, rear, both sides and the bottom frame 11, 12, 13, 14 of the installation frame 10 are provided with a protective net 40 on the inside or outside, or on the inside and outside. can The protective net 40 is preferably made of a material having a certain strength or more as a wire mesh. That is, the protection net 40 can prevent the filter net 23 of the filter unit 20 from being lost and damaging the separation membrane module as described above.

In addition, as shown in FIG. 5 , a plurality of safety bars 50 may be further provided in the front, rear, and side frames 11 , 12 and 13 of the installation frame 10 in the inward direction and in the transverse direction. That is, the safety bar 50 can prevent the separation membrane module and the installation frame 10, more specifically, the protection net 40 from being lost because the protection net 40 is disposed in close proximity to the separation membrane module.

That is, the coupling means 60, the protective net 40, and the safety bar 50 are subjected to a certain amount of pressure or more toward the separation membrane module when a differential pressure is generated in the separation tank. There is always the possibility of loss or loss. Therefore, the coupling means 60 , the protection net 40 , and the safety bar 50 may be introduced as means for protecting the separation membrane module complementary to each other.

Furthermore, in order to remove foreign substances attached to the filter network 23 of the filter unit 20 according to the present invention, it is preferable that a removal means for spraying a high-pressure fluid to the filter network 23 is further provided.

That is, the removal means increases the durability of the filter network 23 by spraying a fluid at high pressure, such as a water jet or an air jet, to remove contaminants or other foreign substances attached to or adhering to the filter network 23, and also transmits It is desirable to allow performance to be maintained.

The removal means can be implemented in various forms, and the injection nozzle mounted on the slide member 31 of the lead-in/out unit 30 moves in both directions, and the injection nozzle is driven up and down to adjust the injection angle. do. Therefore, each injection nozzle moves in the left and right direction, and by turning the injection nozzle in the vertical direction to adjust the angle to a predetermined angle, the high-pressure fluid can be sprayed over the entire area of the filter network 23, so that it is attached to the filter network 23 It is desirable to increase the removal efficiency of foreign matter or other foreign matter that has been or is adhered.

In this case, the removal means is driven by a pressure sensor when the unit flow rate passing through the filter network 23 is less than the set flow rate, that is, when the permeation amount of the fluid passing through the filter network 23 does not reach the preset permeation amount. Driving may be controlled by a control unit (not shown) at maintenance time.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, but this is only exemplary, and various modifications and equivalent other embodiments are possible by those skilled in the art. will understand

Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

PF : pre-filter module
10: installation frame
11: front frame 12: rear frame
13: side frame 14: floor frame
20: filter unit
21: support frame 23: filter net
30: inlet and outlet
31: slide member 33: insertion groove
40: protection net
50: safety bar
60: coupling means
61: first coupling hole 63: second coupling hole
65: coupling bolt

Claims (8)

In the pre-filter module (PF) disposed on the outside of the submerged membrane module to prevent the inflow of contaminants or contaminants into the separation membrane module,
an installation frame 10 disposed on the outside of the separation membrane module;
a filter unit 20 comprising a support frame 21 and a filter network 23 installed on the support frame 21 to filter out contaminants or contaminants flowing into the separation membrane module; and
A pre-filter module for preventing contamination of an immersion-type membrane module comprising a; inlet/outlet portion (30) formed in the installation frame (10) to enable insertion and discharge of the filter unit (20).
The method of claim 1,
The installation frame 10 is composed of a front frame 11, a rear frame 12, a side frame 13 and a floor frame 14,
The lead-in/out portion 30 is made of a pair and is disposed in plurality in the front, rear, both sides of the installation frame and in the bottom frame 11, 12, 13, and 14,
The filter unit (20) is manufactured in the form of a cartridge and is inserted and discharged in both directions with respect to each of the plurality of inlet/outlets (30).
3. The method of claim 2,
The front, rear, both sides of the installation frame and the bottom frame 11, 12, 13, 14 of the submerged membrane module, characterized in that the protection net 40 is further provided on the inside or outside, or on the inside and outside. Pre-filter module to prevent contamination.
3. The method of claim 2,
The pre-filter module for preventing contamination of the submerged membrane module, characterized in that the front, rear, and side frames 11, 12, and 13 of the installation frame further include a safety bar 50 in the inward direction.
The method of claim 1,
The support frame 21 and the inlet/out portion 30 of the filter unit 20 are further provided with coupling means 60 that enables the filter unit 20 to be fixed to and separated from the inlet/out portion 30. Pre-filter module for preventing contamination of submerged membrane module, characterized in that.
6. The method of claim 5,
The coupling means 60 is formed in the first coupling hole 61 formed in the lead-in/out portion 30 and the support frame 21 of the filter unit 20 to correspond to the first coupling hole 61 . Doedoe including a second coupling hole 63 to be
The coupling means (60) is a pre-filter module for preventing contamination of the submerged membrane module, characterized in that it further comprises a coupling bolt (65) fastened to the first and second coupling holes (61) (63).
The method of claim 1,
In order to remove foreign substances attached to the filter network 23 of the filter unit 20, a removal means for spraying a high-pressure fluid to the filter network 23 is further provided,
The removal means is a pre-filter module for preventing contamination of the submerged membrane module, characterized in that it is driven by the control unit when the unit flow rate passing through the filter network (23) is less than the set flow rate.
The method of claim 1,
The filter network 23 of the filter unit 20 has a double membrane structure and is composed of a mesh network in the form of agglomeration, and the filter network 23 is made of polypropylene material of 200 denier Contamination of the submerged separator module Pre-filter module for prevention.

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