A jellyfish-like combined fiber structure and a device and method for deep oil and suspended matter removal

Abstract

The application provides a jellyfish-like combined fiber structure, which comprises a cap structure and a plurality of heterogeneous fibers connected to the inner side of the cap structure, the upper end of the cap structure is provided with an oil discharge hole, the heterogeneous fibers comprise oil-wet fibers and water-wet fibers, and the oil-wet fibers are arranged more near the oil discharge hole, and the water-wet fibers are arranged more near the edge of the cap structure. The application also provides a deep oil and suspended matter removal device and method comprising the jellyfish-like combined fiber structure as a filler inner member, which is widely applicable to the collaborative separation of oil phase, dissolved organic matter and suspended matter in multiple scenes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewage treatment in the environmental protection field, and in particular relates to a jellyfish-like combined fiber structure and a device and method suitable for the cooperative separation of oil phase, dissolved organic matter and suspended matter in multiple scenes and deep oil removal and suspension removal. BACKGROUND

[0002] A large amount of wastewater containing dissolved organic matter, suspended matter and high oil content is generated in the processes of oil field exploitation, construction, petroleum chemical industry, mechanical manufacturing and kitchen waste treatment. The treatment methods for such wastewater generally include chemical methods and physical methods. The chemical method mainly involves the addition of chemical agents, but the addition of chemical agents will introduce new pollutants and cause secondary pollution, and different chemical agents need to be selected for different wastewater, which has poor applicability. The applicability of the physical method is relatively wide, but the physical method mainly includes centrifugal separation, filtration, electric field separation and ultrasonic separation, which has high energy consumption, complex device, high maintenance cost and is prone to blockage, and frequent backwashing operation is required. In addition, in the traditional wastewater treatment method, the removal of dissolved organic matter is usually treated by physical and chemical methods, but the treatment effect will become poor after a certain period of time and will eventually fail.

[0003] CN201911019348.4 discloses a high ferric acid salt oxidant composite fiber filter material and its preparation. The filter material removes organic matter in wastewater through oxidation reaction, and the filter material needs to be removed and replaced after failure. However, the removal of organic matter in wastewater depends on the chemical reaction of the added high ferric acid salt oxidant, which will introduce new pollutants, and the filter material will often fail, which has low economic benefit.

[0004] CN202121662568.1 discloses an activated carbon filter which can remove organic matter in wastewater by using the adsorption of activated carbon. However, the removal of organic matter by activated carbon is easily affected by other pollutants in wastewater, which weakens the removal effect of organic matter.

[0005] CN202221173516.2 discloses a fiber filter material for efficiently removing suspended matter in wastewater, which adopts a Y-shaped filter structure for intercepting suspended matter in wastewater. CN201720744675.6 and CN202122483676.9 both disclose a comet-shaped fiber filter material which is also used for filtering suspended matter in wastewater. By improving the connection mode of the comet nucleus and the comet tail, the disadvantages of the original fiber filter material, such as inconvenient installation and poor backwashing effect, are overcome. However, the above-mentioned fiber filter materials are only suitable for the separation of suspended matter in wastewater, and cannot cooperatively treat oil phase and dissolved organic matter in wastewater.

[0006] CN201410211202.0 and CN201410211201.6 disclose two fiber weaving methods suitable for oil-water separation, which can effectively remove the oil phase in sewage and also have a certain interception effect on suspended matter. However, different weaving treatments are required for the fiber materials according to different treatment conditions. The processing process is relatively complicated and tedious, and the interception of suspended matter by the weaving fibers is very likely to cause blockage and is difficult to clean.

[0007] Therefore, the present application aims to address the shortcomings of the above traditional sewage treatment methods and to provide a device and method that is energy-efficient, efficient, has a long treatment time, and can compactly treat multiple pollutants in sewage. Summary of the Invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a jellyfish-like combined fiber structure and a device and method for deep oil and suspended matter removal. Through a jellyfish-like structure with heterogeneous fibers and a lipophilic umbrella cap structure, efficient and compact collaborative separation of oil phases, soluble organic matter, and suspended matter in multiple scenarios can be achieved.

[0009] In view of the shortcomings of the current existing technology, the technical solutions provided by the present invention are as follows:

[0010] A jellyfish-like composite fiber structure includes an umbrella cap structure and a plurality of heterogeneous fibers connected to the inner side of the umbrella cap structure. The umbrella cap structure is a hemispherical shell structure with an oil drainage hole provided at the upper end. The heterogeneous fibers form a fiber bundle structure. The heterogeneous fibers include oleophilic fibers and hydrophilic fibers. The oleophilic fibers arranged near the oil drainage hole are more numerous than the hydrophilic fibers, and the hydrophilic fibers arranged near the edge of the umbrella cap structure are more numerous than the oleophilic fibers.

[0011] The present invention is further configured such that the ratio d / D of the diameter of the oil drainage hole to the diameter of the umbrella cap structure is 0.2-0.6, preferably 0.2-0.4; the ratio L / D of the length of the heterogeneous fiber to the diameter of the umbrella cap structure is 1-3, preferably 1.5-2.

[0012] Preferably, the diameter D of the umbrella cap structure is 5 to 20 mm, the diameter d of the oil drainage hole is 1 to 6 mm, and the length L of the heterogeneous fiber is 20 to 30 mm.

[0013] The present invention is further configured such that the ratio of the hydrophilic fibers to the oleophilic fibers in the fiber bundle structure is 1:1 to 1:3.

[0014] The application is further configured that the umbrella cap structure is divided into an inner ring area and an outer ring area in a radial direction, a ratio d0 / D of a diameter of the inner ring area to a diameter of the umbrella cap structure is 0.25-1, preferably 0.4-0.6; a number ratio of the oleophilic fibers to the hydrophilic fibers arranged in the inner ring area of the umbrella cap structure is 3:1-5:1, and a number ratio of the oleophilic fibers to the hydrophilic fibers arranged in the outer ring area is 1:5-1:3.

[0015] The application is further configured that the umbrella cap structure is made of an oleophilic material, and the material can be selected from one or more of PP, PTFE, PET and PA; the material of the oleophilic fibers can be selected from one or more of PP, PTFE, PET and PA; and the material of the hydrophilic fibers can be selected from one or more of 316 stainless steel, cotton fiber and nylon fiber.

[0016] The application is further configured that the jellyfish-like combined fiber structure can be used as a filler inner part alone or in combination to form a combined inner part filler.

[0017] The second aspect of the application provides a deep oil and suspended matter removal device, which comprises a synergistic separation device, the synergistic separation device comprises a shell, the shell is provided with an emulsion inlet, an oil phase outlet and a purified water outlet, the shell is sequentially provided with a flow distribution device and an oleophilic / hydrophilic random packing bed along a material flow direction, and the packing in the oleophilic / hydrophilic random packing bed comprises the jellyfish-like combined fiber structure.

[0018] The third aspect of the application provides a deep oil and suspended matter removal method, which comprises the following steps:

[0019] The wastewater to be treated enters the synergistic separation device, is uniformly distributed by the flow distribution device, and then passes through the oleophilic / hydrophilic random packing bed comprising the jellyfish-like combined fiber structure to capture, coalesce and grow oil droplets, and the internal circulation flow caused by the shear flow of the oil droplets can capture dissolved organic matter and micro-nano suspended matter particles, and the suspended matter particles are captured by the interception of the packing bed, and the oil phase carrying the dissolved organic matter and the micro-nano suspended matter particles and the purified water are separated and discharged.

[0020] The application is further configured that the concentration of the suspended matter in the wastewater to be treated is 50-2000 mg / L, the concentration of the dissolved organic matter is 8-1500 mg / L, and the oil content is 6-5000 mg / L.

[0021] The application is further configured that the flow rate of the fluid in the synergistic separation device is 0.001-0.02 m / s.

[0022] The application is further provided that the deep oil and suspended matter removal device further comprises a static mixing unit arranged upstream of the synergistic separation device, so as to ensure sufficient dispersed oil phase in the sewage, and the sewage to be treated, external oil phase and / or part of the oil phase separated by the synergistic separation device are mixed in the static mixing unit and then enter the synergistic separation device for synergistic separation.

[0023] Further, the oil phase introduced into the static mixing unit is selected from one or more of crude oil, diesel oil, silicone oil, lubricating oil and edible oil.

[0024] The application is further provided that when the synergistic separation device operates for a certain period of time, backwashing liquid and backwashing gas can be introduced for gas-water combined backwashing, so as to avoid device blockage caused by long use time.

[0025] Further, during backwashing, the intensity of backwashing water is 40-60 m 3 / (m 2 ·h), the intensity of backwashing gas is 20-30 m 3 / (m 2 ·h), and the backwashing time is 3-30 minutes.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] The application innovatively provides a separation and dispersion internal component with jellyfish type combined fiber structure, which can be widely applied to compact and efficient synergistic separation and treatment of oil phase, dissolved organic matter and suspended matter in ordinary domestic sewage, construction wastewater, kitchen wastewater and oilfield exploitation wastewater in cooperation with related devices.

[0028] The device and method of the application have the advantages of good separation effect, large treatment capacity, high separation efficiency, low energy consumption, simple device, low maintenance cost and wide applicability, and improve the problems of low separation efficiency, high energy consumption and poor applicability of traditional process equipment. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The application is a deep oil and suspended matter removal device and process flow diagram;

[0030] Figure 2 The application is a front view and top view of the jellyfish type combined fiber structure;

[0031] Figure 3 The application is a mechanism diagram of the jellyfish type combined fiber structure;

[0032] Figure 4 The application is a schematic diagram of the jellyfish type combined fiber structure combination with array combination;

[0033] Figure 5 Front view of the jellyfish-like combined fiber structure combination with rectangular array combination of the present application;

[0034] Wherein, 1, static mixing unit; 2, oil phase inlet; 3, synergistic separation device; 4, shell; 5, emulsion inlet; 6, oil phase outlet; 7, purified water outlet; 8, backwash inlet; 9, backwash outlet; 10, rectifier distributor; 11, oil-wet / hydrophilic random packed bed; 12, backwash waste liquid collection tank; 13, backwash waste liquid inlet; 14, backwash waste liquid outlet; 15, oil tank; 20, umbrella cap structure; 21, oil discharge hole; 22, oil-wet fiber; 23, hydrophilic fiber; 24, oil droplet; 25, dissolved organic matter; 26, inner ring area; 27, outer ring area. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described below in specific embodiments. It should be understood that the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application. Unless otherwise defined, all professional and scientific terms used herein have the same meaning as familiar to those skilled in the art.

[0036] The technical concept of the present application is: first, to provide a jellyfish-like combined fiber structure as an internal component, which utilizes the material and structural characteristics to produce demulsification separation effect on oil-water emulsion at the intersection node of heterogeneous media, and the umbrella cap structure in the jellyfish-like structure can enrich and capture oil droplets, and the coalesced oil droplets continuously capture dissolved organic matter and micro-nano suspended particles under the action of shear flow, and the packing structure formed by the jellyfish-like structure combination can realize interception of suspended particles, and the combined action of deep interception of suspended particles through the packing bed and the auxiliary action of internal circulation of oil droplets realizes removal, and finally realizes the synergistic separation of oil phase, dissolved organic matter and suspended particles in wastewater.

[0037] Secondly, to construct a device and process method for deep oil and suspended removal including the jellyfish-like combined fiber structure, to mix the wastewater to be treated with part of the external oil phase or / and part of the separated oil phase again in the static mixing unit to ensure sufficient dispersed oil phase; to distribute the obtained mixed liquid through the rectifier distributor, and to complete the demulsification, interception of suspended particles and removal of dissolved organic matter in the packing bed with the jellyfish-like combined fiber structure according to the above-mentioned mechanism, to realize the synergistic separation of oil phase, dissolved organic matter and suspended particles in wastewater, and to discharge the purified water and oil phase after separation to the subsequent process flow, and the separated oil phase can also be recycled to the static mixing unit when the oil content of the wastewater to be treated is low.

[0038] Example 1

[0039] like Figure 2 The figure shows the front view and top view of the jellyfish-like combined fiber structure of the present invention. The jellyfish-like combined fiber structure includes an umbrella cap structure 20 and a plurality of heterogeneous fibers connected to the inner side of the umbrella cap structure 20. The umbrella cap structure 20 is an oleophilic hemispherical shell structure with a circular oil drainage hole 21 at the upper end. The heterogeneous fibers form a fiber bundle structure. The heterogeneous fibers include oleophilic fibers 22 and hydrophilic fibers 23. The oleophilic fibers 22 arranged near the oil drainage hole 21 are more than the hydrophilic fibers 23, and the hydrophilic fibers 23 arranged near the edge of the umbrella cap structure are more than the oleophilic fibers 22.

[0040] Furthermore, the diameter of the umbrella cap structure 20 is D, the diameter of the oil drainage hole 21 is d, and the length of the heterogeneous fiber is L. The ratio of the diameter of the oil drainage hole 21 to the diameter of the umbrella cap structure 20 is d / D = 0.2 to 0.6, preferably 0.2 to 0.4; the ratio of the length of the heterogeneous fiber to the diameter of the umbrella cap structure 20 is L / D = 1 to 3, preferably 1.5 to 2. Specifically, the diameter D of the umbrella cap structure 20 is preferably 5 to 20 mm, the diameter d of the oil drainage hole 21 is preferably 1 to 6 mm, and the length L of the heterogeneous fiber is preferably 20 to 30 mm.

[0041] Furthermore, the ratio of the hydrophilic fibers 23 to the oleophilic fibers 22 in the heterogeneous fibers is 1:1 to 1:3. The umbrella-cap structure 20 is radially divided into an inner ring region 26 and an outer ring region 27. The diameter of the inner ring region 26 is d0, and the ratio of the diameter of the inner ring region 26 to the diameter of the umbrella-cap structure 20 is d0 / D = 0.25 to 1, preferably 0.4 to 0.6. The ratio of the oleophilic fibers 22 to the hydrophilic fibers 23 arranged within the inner ring region 26 of the umbrella-cap structure 20 is 3:1 to 5:1, while the ratio of the oleophilic fibers 22 to the hydrophilic fibers 23 arranged within the outer ring region 27 is 1:5 to 1:3. The distribution structure of the heterogeneous fibers is more conducive to the coalescence and demulsification of oil droplets.

[0042] Furthermore, the umbrella cap structure 20 is made of an oleophilic material, and its material can be selected from one or more materials such as PP, PTFE, PET and PA; the oleophilic fiber 22 is made of an oleophilic material, and its material can be selected from one or more materials such as PP, PTFE, PET and PA; the hydrophilic fiber 23 is made of a hydrophilic material, and its material can be selected from one or more materials such as 316 stainless steel, cotton fiber, nylon fiber, etc.

[0043] Combine Figure 3As shown, the diagram shows the principle of oil droplet coalescence and capture of dissolved organic matter and micro-nano suspended particles on the jellyfish-like combined fiber structure. When the emulsified sewage flows through the jellyfish-like structure, the oil phase in the emulsion is captured by the oleophilic fibers 22 of the jellyfish-like structure, the oil droplets 24 wet and wrap around the surface of the oleophilic fibers 22, when the oil droplets 24 collide with the hydrophilic fibers 23, they will adhere to one side of the hydrophilic fibers 23 with a certain contact angle without wrapping the fibers, therefore the oleophilic fibers 22 have the effect of capturing and inducing coalescence of small oil droplets, and the hydrophilic fibers 23 have the effect of fixing the coalesced and grown oil droplets, which produces a demulsification and separation effect on the oil-water emulsion at the intersection node of the heterogeneous media. As the oil droplets 24 coalesce along the fiber bundle, the oil droplets 24 undergo internal circulation flow caused by shear flow, which can continuously capture dissolved organic matter 25 and micro-nano suspended particles (not shown in the figure, the schematic diagram is similar to the dissolved organic matter 25) in the sewage. And after the oil droplets 24 gather and grow, they contact the umbrella cap structure 20 with oleophobic and hydrophobic properties, which will further enrich the oil droplets 24 and increase the time for capturing dissolved organic matter and micro-nano suspended particles, and also have a more efficient treatment effect on oil-water separation. Finally, due to the fact that there are more oleophilic fibers 22 and fewer hydrophilic fibers 23 in the inner ring area 26 near the oil discharge hole 21 of the umbrella cap structure, the oil droplets start to gather from the top of the umbrella cap structure 20, and there are more hydrophilic fibers 23 and fewer oleophilic fibers 22 in the outer ring structure 27 near the edge of the umbrella cap structure 20, so the water phase will start to gather from the outer ring area 27, when it reaches a certain degree, the oil phase will separate from the top of the jellyfish-like structure, and the water phase will separate from the outer ring area 27, completing the demulsification process, finally obtaining the oil phase carrying dissolved organic matter and micro-nano suspended particles and purified water, realizing the removal of oil phase, dissolved organic matter and micro-nano suspended particles in the sewage. When the jellyfish-like combined fiber structure is scattered to form a filler bed, the suspended particles can be intercepted and captured by the interception effect of the filler bed, and the suspended particles are removed by the combined action of the deep interception effect of the filler bed and the internal circulation capture effect of the oil droplets.

[0044] The jellyfish-like combined fiber structure can be used as a filler inner part alone, or can be combined to form a combined inner part filler. As shown in Figures 4-5 The diagram shows several combined inner parts with array combinations of the jellyfish-like combined fiber structure, different array combinations can be used to adapt to different oil-water separation and suspended particle interception requirements. The inner part type formed by a single or multiple arrays of the jellyfish-like combined fiber structure is within the scope of protection of the present application.

[0045] Further, when the oil droplet particle size and suspended particle size in the sewage are large, the Figure 4The rectangular array combined internals of (a) can be used as filler internals when the oil droplet size and the suspended particle size gradually decrease, respectively Figure 4 The circular array combined internals of (b), Figure 4 The rhombic array combined internals of (c), Figure 4 The triangular array combined internals of (d), and the single jellyfish-like combined fiber structure as filler internals.

[0046] Further, the removal effects of the oil phase, the dissolved organic matter and the suspended matter in the sewage can also be ensured by the combined use of different combined internals. The top layer of the filler bed is the scattered packing of the rectangular array combined internals, and the scattered packing of the circular array combined internals, the rhombic array combined internals, the triangular array combined internals and the single jellyfish-like combined fiber structure are sequentially arranged downward, so as to ensure the synergistic treatment effect and the treatment efficiency.

[0047] Example 2

[0048] As shown in Figure 1 , it is a device and process flow diagram for deep oil and suspended removal according to the present application. The device for deep oil and suspended removal comprises a synergistic separation device 3, wherein the synergistic separation device 3 comprises a shell 4, and an emulsion inlet 5 is arranged on the shell 4, which is used for feeding the sewage to be treated or the mixed emulsion of the sewage to be treated and the oil phase into the synergistic separation device 3. An oil phase outlet 6 and a purified water outlet 7 are respectively arranged at the upper part and the lower part of the shell 4. An oil / water scattering type filler bed 11 and a flow distributor 10 are sequentially arranged in the shell 4 along the material flow direction. The filler in the oil / water scattering type filler bed 11 comprises the jellyfish-like combined fiber structure described in the above example 1.

[0049] The method for deep oil and suspended removal by using the synergistic separation device comprises the following steps:

[0050] The sewage to be treated enters the synergistic separation device 3 through the emulsion inlet 5, is uniformly distributed by the flow distributor 10, and then passes through the oil / water scattering type filler bed 11 comprising the jellyfish-like combined fiber structure, so as to capture, coalesce and grow the oil droplets. The internal circulation flow caused by the shear flow of the oil droplets can capture the dissolved organic matter and the micro-nano suspended particles. Meanwhile, the large particle suspended particles are captured by the interception of the filler bed 11. The oil phase carrying the dissolved organic matter and the micro-nano suspended particles and the purified water are separated and discharged from the oil phase outlet 6 and the purified water outlet 7, respectively, or are fed into the subsequent process flow.

[0051] Further, the flow rate of the fluid in the synergistic separation device 3 is 0.001-0.02 m / s.

[0052] Further, the concentration of suspended solids in the sewage to be treated is 50-2000 mg / L, the concentration of dissolved organic matter is 8-1500 mg / L, and the oil content is 6-5000 mg / L. The water phase treated by the synergistic separation device 3 can meet the pollutant limit value for direct discharge of sewage in GB31570-2015.

[0053] Further, the deep oil and suspended solids removal device further comprises a static mixing unit 1, the outlet of the static mixing unit 1 is connected with the emulsion inlet 5, which is used to mix part of the oil phase and then enter the synergistic separation device 3 when the oil content of the sewage to be treated is low. The oil phase inlet 2 of the static mixing unit 1 is connected with the oil phase outlet 6 and / or the oil tank 15. The oil phase from the oil tank 15 and / or the oil phase separated from the synergistic separation device 3 is mixed with the sewage to be treated in the static mixing unit 1 to form an emulsion, which is then introduced into the synergistic separation device 3 for synergistic separation. The separated oil phase is discharged, or is introduced into a subsequent process, or is partially recycled to the static mixing unit 1 for recycling, so as to ensure sufficient dispersed oil phase in the sewage, which is beneficial to the capture of dissolved organic matter and micro-nano suspended solids particles in the subsequent process.

[0054] Further, the oil phase introduced into the static mixing unit 1 can be selected from one or more of crude oil, diesel oil, silicone oil, lubricating oil, and edible oil.

[0055] Further, the shell 4 is provided with a backwashing inlet 8 and a backwashing outlet 9 below and above the lipophilic / hydrophilic random packing bed 11 respectively, which are used for the introduction and discharge of backwashing liquid and backwashing gas respectively. The backwashing outlet 9 is also connected with a backwashing waste liquid collection tank 12 for temporary storage of backwashing waste liquid. The backwashing liquid and backwashing gas can be introduced periodically or aperiodically according to the pressure difference of the packing bed after the device is operated for a period of time, so as to avoid blockage caused by long-term use of the device. The backwashing liquid and backwashing gas are introduced from the backwashing inlet 8, and the backwashing waste water and waste gas are discharged from the backwashing outlet 9. The backwashing waste water is sent to the backwashing waste liquid collection tank 12 through the backwashing waste liquid inlet 13, and the collected backwashing waste liquid is discharged to a subsequent process through the backwashing waste liquid outlet 14.

[0056] Further, during backwashing, the intensity of the backwashing water is 40-60 m 3 / (m 2 ·h), the intensity of the backwashing gas is 20-30 m 3 / (m 2 ·h), and the backwashing time is 3-30 minutes.

[0057] Example 3

[0058] The oil content of the wastewater from an oil field in China reaches 3000 mg / L, the suspended substance concentration reaches 1800 mg / L, and a large amount of dissolved organic matters are contained, and the concentration reaches 1500 mg / L, the wastewater is treated by the cooperative separation device, and the filler bed is formed by single jellyfish type combined fiber structure loose packing filler.

[0059] The oil content in the treated water is reduced to 5 mg / L, the suspended substance concentration is reduced to 30 mg / L, and the dissolved organic matter concentration is reduced to 10 mg / L, the content of the pollutants after being treated by the device meets the wastewater discharge pollutant limit value in GB 31570-2015.

[0060] The application is described in detail, the purpose is to enable those skilled in the art to understand the content of the application and to implement, and cannot limit the protection scope of the application, any equivalent changes or modifications made according to the spirit and essence of the application should be covered within the protection scope of the application.

Claims

1. A jellyfish-like composite fiber structure, characterized in that: The invention comprises an umbrella cap structure and a plurality of heterogeneous fibers connected to the inner side of the umbrella cap structure, wherein an oil drainage hole is provided at the upper end of the umbrella cap structure, and the heterogeneous fibers include oleophilic fibers and hydrophilic fibers, wherein more oleophilic fibers are arranged near the oil drainage hole than hydrophilic fibers, and more hydrophilic fibers are arranged near the edge of the umbrella cap structure than oleophilic fibers; The umbrella cap structure is radially divided into an inner ring area and an outer ring area, and the ratio d0 / D of the diameter of the inner ring area to the diameter of the umbrella cap structure is 0.25 to 1; the number ratio of the oleophilic fibers to the hydrophilic fibers in the inner ring area of ​​the umbrella cap structure is 3:1 to 5:1, and the number ratio of the oleophilic fibers to the hydrophilic fibers in the outer ring area is 1:5 to 1:

3.

2. The jellyfish-like composite fiber structure according to claim 1, characterized in that: The ratio of the hydrophilic fiber to the oleophilic fiber in the heterogeneous fiber is 1:1 to 1:3; the ratio d / D of the diameter of the oil drainage hole to the diameter of the umbrella cap structure is 0.2 to 0.6; and the ratio L / D of the length of the heterogeneous fiber to the diameter of the umbrella cap structure is 1 to 3.

3. The jellyfish-like composite fiber structure according to claim 1, characterized in that: The diameter D of the umbrella cap structure is 5 to 20 mm, the diameter d of the oil drainage hole is 1 to 6 mm, and the length L of the heterogeneous fiber is 20 to 30 mm.

4. The jellyfish-like composite fiber structure according to claim 1, characterized in that: The umbrella cap structure is made of an oleophilic material, and the material is selected from one or more of PP, PTFE, PET and PA materials; the material of the oleophilic fiber is selected from one or more of PP, PTFE, PET and PA materials; the material of the hydrophilic fiber is selected from one or more of 316 stainless steel, cotton fiber, and nylon fiber materials.

5. A device for deep oil and suspension removal, comprising a collaborative separation device, wherein the collaborative separation device is provided with an oleophilic / hydrophilic random packing bed, characterized in that: The filler in the oleophilic / hydrophilic random packing bed comprises the jellyfish-like combined fiber structure described in any one of claims 1 to 4. The jellyfish-like combined fiber structure is used alone as a packing internal or in combination to form a combined internal packing.

6. A method for deep oil and suspension removal using the deep oil and suspension removal device according to claim 5, characterized in that: The steps include: The sewage to be treated enters the collaborative separation device, is first evenly distributed by the rectifier distributor, and then passes through the oleophilic / hydrophilic random packing bed to capture and agglomerate oil droplets. The internal circulation flow caused by the shear flow of the oil droplets can capture dissolved organic matter and micro-nano suspended particles. At the same time, the suspended particles are intercepted and captured by the interception effect of the packing bed, and the oil phase carrying dissolved organic matter and micro-nano suspended particles and purified water are separated and discharged separately.

7. The method for deep oil and suspension removal according to claim 6, characterized in that: The concentration of suspended matter in the sewage to be treated is 50-2000 mg / L, the concentration of dissolved organic matter is 8-1500 mg / L, and the oil content is 6-5000 mg / L; the flow rate of the fluid in the collaborative separation device is 0.001-0.02 m / s.

8. The method for deep oil and suspension removal according to claim 6, characterized in that: The deep oil and suspended phase removal device further comprises a static mixing unit disposed upstream of the collaborative separation device. To ensure sufficient dispersed oil phase in the sewage, the sewage to be treated is mixed with the external oil phase and / or part of the oil phase separated by the collaborative separation device in the static mixing unit before entering the collaborative separation device for collaborative separation. The oil phase introduced into the static mixing unit is selected from one or more of crude oil, diesel, silicone oil, lubricating oil and edible oil.

9. The method for deep oil and suspension removal according to claim 6, characterized in that: After the collaborative separation device has been running for a certain period of time, backwash liquid and backwash gas are introduced to perform gas-water combined backwashing to avoid device blockage; during the backwash operation, the intensity of the backwash water is: 40-60m 3 / (m 2 ·h), the intensity of backwash gas is: 20~30m 3 / (m 2 ·h), backwash time: 3 to 30 minutes.

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