CN218980539U - Oil-water separation filter element and coalescing filter using same - Google Patents

Abstract

The application relates to the technical field of water treatment, in particular to an oil-water separation filter element and a coalescing filter using the same. Wherein, the water oil separating filter core includes: an inner wall skeleton; the filtering area comprises a plurality of filtering units, the filtering units are of hollow thin-wall structures, filtering holes communicated with the hollow inner cavities of the filtering units are formed in the surfaces of the filtering units, and first water outlet channels communicated with the hollow inner cavities of the filtering units are formed in the bottoms of the filtering units; wherein, a plurality of filter units are radial outwards extended from the periphery of inner wall skeleton. According to the oil-water separation filter element, the filtering area is formed by the plurality of hollow filtering units, and compared with a conventional filtering filter element, the filtering area is greatly increased so as to meet the requirement of high treatment capacity; furthermore, the super oleophobic surface layer is arranged on the surface of the filter element, so that the adhesion of oil substances is reduced, the blockage of the filter element is reduced, the oil-water separation effect is improved, and the filter element is particularly suitable for fine filtration treatment of oil-water separation.

Description

Oil-water separation filter element and coalescing filter using same

Technical Field

The utility model relates to the technical field of water treatment, in particular to an oil-water separation filter element and a coalescing filter using the same.

Background

The oil in the oily sewage mainly exists in the sewage in three forms of free oil, emulsified oil and dissolved oil. In general, the free oil has relatively large oil drop size, and can be separated by gravity sedimentation, cyclone separation, air flotation separation or other methods, and the separated oil can be recycled. Because the emulsified oil has a relatively wide particle size distribution (which is relatively large in relation to the emulsification mode and varies from 10-20 micrometers to tens of nanometers), chemical reagents such as reverse demulsifiers, flocculating agents and the like are usually used for separation by combining with subsequent air floatation or filtration treatment, and the residual oil-containing trace dissolved oil and sewage of the emulsified oil are discharged to a biochemical process for treatment. However, the introduction of the chemical reagent in the treatment process can lead the solid which is floated (or precipitated) later to be high-risk solid waste, so that the environment friendliness is low.

In the related art, for emulsified oil and suspended matters in oily sewage, there is a description that oil-water separation is achieved by filtering by using a filter, and after the oil enters the filter, the oil flows through a filter element, and the emulsified oil and suspended matters are trapped on the surface of the filter element, so that oil-water separation is achieved.

However, in the process of implementing the technical scheme of the utility model in the embodiment of the application, the inventor of the application finds that at least the following technical problems exist in the above technology: 1) The filter element is easy to be blocked due to the adhesion of oil substances, so that the maintenance period is shortened, and the problems are serious when the filter element has higher filtering precision; 2) When the treatment capacity is large, the filter is huge; 3) The treatment effect is poor, and more tiny emulsified oil remains in the effluent; 4) The whole process flow is longer, and a longer treatment period is required.

Disclosure of Invention

The utility model aims at providing an oil-water separation filter core and use its coalescing filter can solve among the prior art and filter the not high problem of filter core handling capacity, can high-efficient filtering oil emulsion and suspended solid in the oily sewage, and be difficult for adhesion oil substance to lead to the filter core to block up, is applicable to oily sewage's fine filtration treatment.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

in a first aspect, the present application provides an oil-water separation filter cartridge, characterized in that the filter cartridge comprises:

an inner wall skeleton;

the filtering area comprises a plurality of filtering units, the filtering units are of hollow thin-wall structures, filtering holes communicated with the hollow inner cavities of the filtering units are formed in the surfaces of the filtering units, and first water outlet channels communicated with the hollow inner cavities of the filtering units are formed in the bottoms of the filtering units;

wherein, a plurality of filter units are radial outwards extended from the periphery of inner wall skeleton.

According to the embodiment of the application, the filtering area is formed by extending the plurality of hollow filtering units along the peripheral radiation of the inner wall framework, and the plurality of wall surfaces are formed by the hollow filtering units, so that more filtering area is provided, and the oil-water separation filter element has higher treatment capacity.

In a possible implementation of the first aspect, the surface of the filter unit is provided with a super oleophobic surface layer, the super oleophobic surface layer having a contact angle of oil with its surface of not less than 120 °.

According to the embodiment of the application, the surface of the filtering unit is enabled to form super oleophobic property, when the filtering unit is used for treating oily sewage, the formed surface has larger repulsive force on oil molecules, when an oil-water mixture simultaneously flows through, extra resistance can be formed on oil drops, and corresponding emulsified oil drops and suspended matters can be blocked by matching with different filtering apertures; meanwhile, the super oleophobic surface layer ensures that oil is not easy to adhere to the surface of the filtering unit, thereby reducing or avoiding blocking the filter element body; in addition, because the oil drops can not pass through the super oleophobic surface layer, the oil drops are suspended in the liquid on the surface of the filtering unit and collide with each other to form a coalescing effect, and through the arrangement, the filtering separation of most of emulsified oil and insoluble suspended matters in the oily sewage can be efficiently realized.

In one possible implementation of the first aspect, the super-oleophobic surface layer further has a contact angle of water with its surface of less than 10 °.

According to the embodiment of the application, the surface of the filtering unit has super-hydrophilic property, so that the oil-water separation effect is further improved.

In one possible implementation of the first aspect, the oil-water separation filter element further includes:

a first seal plate;

the second sealing plate is provided with a second water outlet channel communicated with the first water outlet channel;

the first sealing plate and the second sealing plate are respectively encapsulated at two ends of the filtering area.

In one possible implementation of the first aspect, a gap is formed between adjacent filter units, and the first sealing plate is provided with a penetration hole that communicates with the gap.

In a second aspect, the present application provides a coalescing filter comprising:

a housing, wherein an accommodating space is formed inside the housing;

an oil-water separation filter element, wherein the oil-water separation filter element is as described in the first aspect, and the oil-water separation filter element is arranged in the accommodating space;

a liquid inlet;

a water outlet;

and a flow passage for enabling fluid to flow through the oil-water separation filter element is arranged between the liquid inlet and the water outlet.

According to the embodiment of the application, the filter unit with a plurality of hollow structures forms a larger filtering area, and the treatment capacity of the filter is improved under the same volume.

In one possible implementation of the second aspect, the coalescing filter further includes:

and the air floatation port is communicated with the oil-water separation filter element and the micro-bubble generation mechanism.

According to the embodiment of the application, the air flotation is used for assisting the flotation of impurities on the surface of the filter element, so that the oil-water separation is further accelerated.

In one possible implementation of the second aspect, the micro-bubble generating mechanism includes a dissolved air pump.

In one possible implementation of the second aspect, the coalescing filter further includes:

and the back flushing port is communicated with the filtering area and the back flushing liquid.

In one possible implementation of the second aspect, the oil-water separation filter element is arranged vertically, the inner wall skeleton extends above the coalescing unit, and an oil liquid collecting area is arranged above the filtering area; the coalescing filter further includes an oil outlet, and the oil accumulation region communicates with the oil outlet.

Drawings

FIG. 1 illustrates a schematic diagram of a configuration of an oil-water separation cartridge, according to some embodiments of the present application;

FIG. 2 illustrates a cross-sectional view of a filtration zone, according to some embodiments of the present application;

FIG. 3 illustrates a schematic view of a coalescing filter structure in accordance with some embodiments of the present application;

FIG. 4 illustrates a cross-sectional view of a coalescing filter in accordance with some embodiments of the present application;

FIG. 5 illustrates a schematic diagram of an oil accumulation zone, according to some embodiments of the present application.

Detailed Description

The technical features and advantages of the present application are described in more detail below with reference to the accompanying drawings so that the advantages and features of the present application may be more readily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.

It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application.

It should be noted that, in the description of the present application, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.

The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying an importance of the illustrated technical features.

Furthermore, it should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

In a first aspect, an embodiment of the present application provides an oil-water separation filter element 3, please refer to fig. 1-2, the filter element includes:

an inner wall skeleton 320;

the filtering area 310 comprises a plurality of filtering units 311, the filtering units 311 are in a hollow thin-wall structure, filtering holes communicated with a hollow inner cavity 312 of the filtering units 311 are formed in the surface of the filtering units 311, and a first water outlet channel 314 communicated with the hollow inner cavity 312 of the filtering units 311 is formed in the bottom of the filtering units 311;

wherein, the plurality of filtering units 311 extend radially outwards from the periphery of the inner wall skeleton 320.

Conventional filter cartridges, the throughput of which is limited by their volume, require an increase in the volume or number of cartridges when higher throughput is required; in this embodiment, the plurality of hollow filter units 311 radially extend along the periphery of the inner wall skeleton 320 to form the filter area 310, and the hollow structure forms a plurality of side walls, so that a larger filter area is provided, and the oil-water separation filter element 3 has higher treatment capacity. After the oil-water mixture is introduced into the oil-water separation filter element 3, impurities such as emulsified oil, suspended matters and the like flowing through each filter unit 311 are trapped on the surface of the filter unit 311, water passes through the wall surface of the filter unit 311 to reach the inner cavity 312 thereof, and is discharged from the first water outlet channel 314 at the bottom of the filter unit 311 under the action of gravity.

In some possible embodiments, the filtering unit 311 may be an axially extending thin-walled elongated structure, the axial cross section of which may be rectangular, fan-shaped or other suitable shape, each wall surface of the filtering unit 311 contacting the oily sewage may have a porous structure, the porous structure forms the filtering holes, and the pore diameter of the filtering holes may be set according to the treatment index of the oily sewage.

In some preferred embodiments, referring to fig. 2, the cross section of the filtering unit 311 may be rectangular.

The wall thickness of the filter unit 311 may be set according to the pressure of the sewage containing oil, and the larger the wall thickness is, the better the pressure-bearing capability is.

In some possible embodiments, the filter unit 311 may be made of metal, ceramic, PE, polypropylene, or the like.

Illustratively, the filter unit 311 of the present embodiment forms a porous filter structure by ceramic sintering.

It should be noted that, the number of the filter units 311 may be determined according to the throughput, if the filter area needs to be increased, the number of the filter units 311 may be increased by installing more filter units 311 on the inner wall skeleton 320 with the same size, or by increasing the size of the inner wall skeleton 320 to install more filter units 311; meanwhile, it may be also realized by extending the axial length of the filter unit 311.

The inner wall skeleton 320 provides skeleton support for the plurality of filter units 311, and the plurality of filter units 311 may be fixedly mounted on the inner wall skeleton 320 or may be detachably mounted on the inner wall skeleton 320. Illustratively, the plurality of filtering units 311 of the present embodiment are mounted on the inner wall skeleton 320 by means of a slot connection, so as to facilitate subsequent disassembly and maintenance.

In some preferred embodiments, the surface of the filter unit 311 is provided with a super-oleophobic surface layer having a contact angle of oil with its surface of not less than 120 °.

When the conventional filter element is used for filtering and separating oily sewage and other liquids with higher viscosity, oil substances are extremely easy to adhere to the surface of the filter element, so that the blocking of the filter element is caused or accelerated, and the subsequent maintenance period is shortened; meanwhile, the impurity trapped on the surface of the filter element is difficult to separate, and the separation treatment effect is affected.

According to the oil-water separation filter element 3, the super oleophobic surface layer is arranged on the surface of the filter unit 311, and the contact angle between oil and the surface is not smaller than 120 degrees, so that the surface of the filter unit 311 has the characteristic of super oleophobic, and the surface formed by the super oleophobic surface layer has larger repulsive force to oil when being used for oil-containing sewage treatment, and can form additional resistance to oil drops when an oil-water mixture simultaneously flows through, and can block corresponding emulsified oil drops and suspended matters by matching with different filter apertures; meanwhile, the super oleophobic surface layer ensures that oil is not easy to adhere to the surface of the filtering unit 311, thereby reducing or avoiding blocking the filter element body; in addition, because the oil drops can not pass through the super oleophobic surface layer, the oil drops are suspended in the liquid on the surface of the filtering unit 311 and collide with each other to form a coalescing effect, and through the arrangement, the filtering separation of most of emulsified oil and insoluble suspended matters in the oily sewage can be efficiently realized.

Preferably, the super oleophobic surface layer has a contact angle between the oil and the surface of the super oleophobic surface layer greater than or close to 150 degrees, so that the surface of the filtering unit 311 has better oleophobic property, the coalescence-separation effect is improved, and the treatment time is shortened.

In some preferred embodiments, the super oleophobic skin layer further has a contact angle of water with the surface of less than 10 °. The super oleophobic surface layer enables the filter unit 311 to have the characteristic that water passes through and oil drops are trapped, and by utilizing the characteristic, emulsified oil and suspended matters with small particle size in the oily sewage which are not easy to separate by a conventional physical method can be separated, and the separation speed is high, and the separation effect is good.

It should be noted that, the super oleophobic surface layer may be disposed on the surface of the filter unit 311 in a material modification manner, may be disposed on the surface of the filter unit 311 in a spraying manner, or may be attached to the surface of the filter element body in other reasonable manners, so that the implementation of the technical effect of the present application will not be affected.

In some preferred embodiments of the present application, the super oleophobic skin is provided on the surface of the coalescing element by spraying.

In some possible embodiments, referring to fig. 1, the oil-water separation filter element 3 further includes:

a first seal plate 330;

a second sealing plate 340, where the second sealing plate 340 is provided with a second water outlet channel that communicates with the first water outlet channel 314;

the first sealing plate 330 and the second sealing plate 340 are respectively encapsulated at two ends of the filtering area 310.

The first sealing plate 330 and the second sealing plate 340 are used for radially sealing and fixing the plurality of filtering units 311, and are convenient for connecting and installing the oil-water separation filter element 3 and other components, the second sealing plate 340 is arranged at the bottoms of the plurality of filtering units 311, and is provided with a second water outlet channel communicated with the first water outlet channel 314, and is used for discharging filtered water.

Further, referring to fig. 2, a gap 313 is formed between adjacent filter units 311, the first sealing plate 330 is provided with a penetration hole communicating with the gap 313, and impurities trapped on the surface of each filter unit 311 can be discharged through the penetration hole after passing through the gap 313 when floating upwards.

According to the oil-water separation filter element 3, the filtering area 310 is formed by the plurality of hollow filtering units 311, compared with a conventional filtering filter element, the filtering area is greatly increased, the number of the filtering units 311 can be further expanded, the volume of the filter element is small, and the requirement of high treatment capacity is met; furthermore, by arranging the super oleophobic surface layer on the surface of the filter element, the adhesion of oil substances is reduced, the blockage of the filter element is reduced, the oil-water separation effect is improved, and the filter element is particularly suitable for fine filtration treatment of oil-water separation.

In a second aspect, embodiments of the present application provide a coalescing filter, referring to fig. 3-4, comprising:

a housing 1, wherein an accommodating space 110 is formed inside the housing 1;

an oil-water separation filter element 3, wherein the oil-water separation filter element 3 is as described in the first aspect, and the oil-water separation filter element 3 is disposed in the accommodating space 110;

a liquid inlet 2;

a water outlet 5;

wherein, a flow passage for enabling fluid to flow through the oil-water separation filter element 3 is arranged between the liquid inlet 2 and the water outlet 5.

In some possible embodiments, the housing 1 may be in a vertical structure, the oil-water separation filter element 3 is vertically disposed in the accommodating space 110, and the housing 1 may be vertically installed by a plurality of legs 11, and the vertical structure has a smaller occupied space.

Further, the upper mounting member 120 and the lower mounting member 130 may be disposed in the casing 1, and the oil-water separation filter element 3 is clamped between the lower mounting member 130 and the upper mounting member 120 through the first sealing plate 330 and the second sealing plate 340, so that the installation of the filter element is simpler and more convenient.

In some possible embodiments, the coalescing filter further comprises: the air floatation port 6 is communicated with the oil-water separation filter element 3 and the micro-bubble generation mechanism, so that the impurity separation on the surface of the filter element is accelerated by utilizing the air floatation effect.

By introducing the air floatation effect, dynamic flushing is formed, so that the adhesion of oil drops, asphaltene or other viscous substances can be prevented, large oil drops are selected in an auxiliary floatation manner, the impurity separation speed is increased, and the treatment time of the whole flow is shortened.

The air floatation method is one of water treatment methods, and forms highly dispersed tiny bubbles in water, solid or liquid particles of hydrophobic groups in wastewater are adhered to form a water-air-particle three-phase mixed system, and after the particles are adhered to the bubbles, flocs with surface density smaller than that of water are formed to float to the water surface to form a scum layer, so that the solid-liquid or liquid-liquid separation process is realized.

In some preferred embodiments of this application, through super oleophobic top layer's oleophobic characteristic, combine the microbubble to wash, further prevent the oil drop adhesion and reduce the filter core jam when supplementary flotation impurity, promoted oil water separation's effect and treatment effeciency.

In some embodiments of the present application, the method for generating the microbubbles by the microbubble generating mechanism may be an electrolysis method, an aeration air floatation method, a dissolved air floatation method or others, preferably, the embodiment of the present application adopts the dissolved air floatation method to generate the microbubbles, the microbubble generating mechanism generates dissolved air and water, the dissolved air and water is introduced into the accommodating space 110 through the air floatation port 6, the air floatation port 6 is disposed at a position close to the lower side of the accommodating space 110, and the surface of the oil-water separation filter element 3 is dynamically washed by the microbubbles in the rising process, so as to float out impurity particles.

In some preferred embodiments of the present application, the micro-bubble generating mechanism may be a dissolved air pump, and compared with a conventional pressurized dissolved air method, the micro-bubble generated by the dissolved air pump has a more uniform particle size and a better bubble stability, so that the flotation effect can be further improved.

In some possible embodiments, referring to fig. 4, the coalescing filter further comprises: a pressurizing port 9, the pressurizing port 9 is communicated with the accommodating space 110. The pressurization port 9 pressurizes the inside of the accommodating space 110, thereby maintaining the liquid level in the accommodating space 110 and accelerating the drainage.

For example, the pressure may be formed in the accommodating space 110 by introducing compressed gas into the pressurizing port 9, and the pressure range may be set between 0 mpa and 0.3 mpa.

In some possible embodiments, the accommodating space 110 may be communicated with a pressure monitoring device, so as to monitor the pressure value inside the accommodating space in real time, and facilitate an operator to monitor whether the oil-water separation filter element 3 is blocked.

For example, referring to fig. 4, the pressure monitoring device may be a pressure gauge 10 disposed above the housing 1.

In some possible embodiments, referring to fig. 4, the coalescing filter further comprises: and the back flushing port 7 is communicated with the oil-water separation filter element 3. The back flushing liquid is injected into the back flushing port 7 to back flush the oil-water separation filter element 3, so that the maintenance of the filter element is realized.

Illustratively, the backwash liquid may be clean water, dissolved air water, or water discharged after coalescence and separation, and the backwash port 7 may be provided with a one-way valve.

In some possible embodiments, referring to fig. 4, the back flushing port 7 may be disposed below the housing 1 near the second sealing plate 340, and the back flushing liquid sequentially passes through the second water outlet channel of the second sealing plate 340 and the first water outlet channel 314 of the filter unit 311 to communicate with the hollow cavity 312 of the filter unit 311, so as to implement back flushing on each filter unit 311.

Preferably, the back flushing port 7 can be automatically opened at fixed time, so that the oil-water separation filter element 3 is flushed at fixed time in an on-line mode.

In some possible embodiments, referring to fig. 4, the oil-water separation filter 3 may be disposed at the center of the housing 1, and the upper end of the inner wall skeleton 320 extends out of the filtering area 310 to connect the housing 1, and the oil collecting area 4 is formed above the filtering area 310.

In some possible embodiments, referring to fig. 4, the oil collecting area 4 includes a rectifying area 410 and an oil bin 420 sequentially from bottom to top, and oil droplets and impurities floated in the filtering area 310 first enter the rectifying area 410 through the penetrating holes of the first sealing plate 330 and then are collected in the oil bin 420; the coalescing filter further comprises: an oil outlet 8, the oil outlet 8 is communicated with the oil bin 420 to realize the discharge of floating oil; the oil outlet 8 is simultaneously communicated with the accommodating space 110, and part of impurities filtered out by the filtering area 310 can be directly led to the oil outlet 8 from the accommodating space 110 to be discharged.

For example, referring to fig. 5, the oil collecting region 4 is disposed at an extending end portion of the inner wall skeleton 320, and may include a rectifying plate 413, a partition wall 420, a plurality of spacers 411 and an upper cover plate 430, wherein the spacers 411 are disposed between the first sealing plate 330 and the rectifying plate 413, a rectifying channel 412 is formed between the spacers 411, the partition wall 420 is disposed at the peripheries of the first sealing plate 330 and the rectifying plate 413, a closed rectifying region 410 is formed between the partition wall 420, the inner wall skeleton 320, the first sealing plate 330 and the rectifying plate 413, impurities of each filtering unit 311 float into the rectifying region 410, and a plurality of rectifying holes 414 are disposed on the rectifying plate 413; oil sump 420 is formed among rectifying plate 413, upper cover plate 430 and partition wall 420, and oil is discharged from rectifying holes 414 to oil sump 420 for collection.

In some possible embodiments, referring to fig. 4, a water accumulating area 140 is formed below the accommodating space 110, and the water accumulating area 140 communicates with the second water outlet channel and the water outlet 5, so as to realize water outlet and drainage of each filter unit 311.

According to the coalescing filter disclosed by the embodiment of the application, a larger filtering area is formed by the plurality of hollow-structure filtering units 311, the treatment area of the filter is increased under the same volume, and the oil-water separation is accelerated by the super oleophobic coating on the surface of the filter element; furthermore, by combining air floatation flushing and assisting in floatation of emulsified oil and suspended matters in the sewage, quick and efficient separation of oil and water is realized, according to the test result of the applicant, the filtration of the oily sewage can be completed within 10-20 minutes at the shortest, and after the oily sewage is treated, the oil content and the suspended matters content can be reduced to below 3ppm, so that the method is particularly suitable for the fine filtration treatment of the oily sewage; meanwhile, the whole separation process is a pure physical method, no chemical reagent is added, no new to-be-treated substance is generated, and the environment is friendly; reasonable structure layout and small occupied space, and is suitable for industrial popularization and application.

The foregoing description is only exemplary embodiments of the present application and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the present application.

Claims (10)

1. An oil-water separation filter element (3), characterized in that it comprises:

an inner wall skeleton (320);

the filtering area (310), the filtering area (310) comprises a plurality of filtering units (311), the filtering units (311) are of hollow thin-wall structures, filtering holes communicated with a hollow inner cavity (312) of the filtering units (311) are formed in the surfaces of the filtering units (311), and a first water outlet channel (314) communicated with the hollow inner cavity (312) of the filtering units (311) is formed in the bottom of the filtering units (311);

wherein, the plurality of filtering units (311) radially extend outwards from the periphery of the inner wall skeleton (320).

2. The oil-water separation filter element (3) according to claim 1, characterized in that the surface of the filter unit (311) is provided with a super oleophobic surface layer having a contact angle of oil with its surface not smaller than 120 °.

3. An oil-water separation cartridge (3) according to claim 2, characterized in that the super oleophobic surface layer further has a contact angle of water with its surface of less than 10 °.

4. The oil-water separation cartridge (3) according to claim 1, characterized in that it further comprises:

a first seal plate (330);

a second sealing plate (340), wherein the second sealing plate (340) is provided with a second water outlet channel communicated with the first water outlet channel (314);

wherein the first sealing plate (330) and the second sealing plate (340) are respectively encapsulated at two ends of the filtering area (310).

5. The oil-water separation filter element (3) according to claim 4, wherein a gap is formed between adjacent filter units (311), and the first seal plate (330) is provided with a penetration hole communicating with the gap.

6. A coalescing filter, the coalescing filter comprising:

a housing (1), wherein an accommodating space (110) is formed inside the housing (1);

an oil-water separation filter element (3), wherein the oil-water separation filter element (3) is as set forth in any one of claims 1 to 5, and the oil-water separation filter element (3) is disposed in the accommodating space (110);

a liquid inlet (2);

a water outlet;

the oil-water separation filter comprises a water inlet (2) and a water outlet, wherein a flow passage for enabling fluid to flow through the oil-water separation filter element (3) is arranged between the water inlet (2) and the water outlet.

7. The coalescing filter according to claim 6, further comprising:

an air floatation port (6), wherein the air floatation port (6) is communicated with the oil-water separation filter element (3) and the micro-bubble generation mechanism.

8. The coalescing filter of claim 7, wherein the microbubble generation mechanism comprises a dissolved air pump.

9. The coalescing filter according to claim 7, further comprising:

and the back flushing port (7) is communicated with the filtering area (310) and back flushing liquid.

10. The coalescing filter according to claim 7, wherein the oil-water separation filter element (3) is arranged vertically, the inner wall skeleton (320) extends above the coalescing unit, and an oil liquid collecting area (4) is arranged above the filtering area (310); the coalescing filter further comprises an oil outlet (8), and the oil collecting area (4) is communicated with the oil outlet (8).

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