High-precision oil-water separation system

Abstract

According to the high-precision oil-water separation system provided by the utility model, the oil-water separation device and the oleophobic ultrafiltration membrane filtering device are used for carrying out two oil removal processes on oil-containing wastewater and then carrying out biochemical treatment, so that the obtained purified water can be directly discharged or recycled. Small-diameter oil drops separated in the secondary oil removal process of the oleophobic ultrafiltration membrane are settled and separated after the diameters of the oil drops are increased through a fiber bed of a specific structure and a special plate group in the oil-water separation device, the two oil removal processes are high in efficiency and thorough in oil removal, and an oil phase separated in the oil-water separation device can be discharged out of a system to be recycled. The system is high in overall resource recycling rate, and has the advantages of small occupied area, simple process operation, low energy consumption, low input cost and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of oily wastewater purification, and further relates to a high-precision oil-water separation system. Background Art

[0002] At present, a large amount of oily wastewater is generated in the production process of titanium dioxide, petrochemical, steel, silicone, coal chemical and other industries in my country. This type of oily wastewater has a high oil content and is difficult to treat. It cannot be directly treated biochemically. At present, the treatment methods of this type of oily wastewater are mostly flotation + adsorption + biochemical. This type of oily wastewater has a long process route, occupies a large area, has high investment costs and requires a large amount of adsorbents. The adsorbents generally require hazardous waste treatment, causing secondary pollution and waste of resources. At the same time, as the adsorbent is used, the adsorption efficiency of the adsorbent gradually decreases, and the stability of the biochemical system gradually deteriorates, which eventually leads to unstable effluent water quality. There are also disadvantages such as large equipment footprint, high investment costs and high operating energy consumption.

[0003] Therefore, there is an urgent need for a high-precision oil-water separation system with high oily wastewater treatment efficiency, small footprint, low operating energy consumption, low investment cost and stable purified water quality. Utility Model Content

[0004] In view of the problems of low efficiency of existing oily wastewater treatment, large equipment footprint, high operating energy consumption and investment costs, the purpose of the utility model is to provide a high-precision oil-water separation system, which uses an oil-water separation device and an oleophobic ultrafiltration membrane filtration device to perform two oil removal processes on the oily wastewater and then perform biochemical treatment to obtain purified water that can be directly discharged or reused. The small-diameter oil droplets separated in the secondary oil removal process of the oleophobic ultrafiltration membrane are enlarged by the fiber bed and special plate group with a specific structure in the oil-water separation device and then precipitated and separated. The two oil removal processes are efficient and the oil removal is thorough. In addition, the oil phase separated in the oil-water separation device can be discharged from the system for recycling, and the overall resource recovery rate of the system is high.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high-precision oil-water separation system comprises: an oily wastewater inlet pipe, an oil-water separation unit, an oleophobic ultrafiltration membrane filtration unit and a biochemical treatment device; the oil-water separation unit comprises an oil-water separation device, the inlet of which is connected to the oily wastewater inlet pipe; the oleophobic ultrafiltration membrane filtration unit comprises an oleophobic ultrafiltration membrane filtration device, the water phase outlet of the oil-water separation device is connected to the inlet of the oleophobic ultrafiltration membrane filtration device; the oil-removed wastewater outlet of the oleophobic ultrafiltration membrane filtration device is connected to the inlet of the biochemical treatment device.

[0007] In some embodiments, the oleophobic ultrafiltration membrane filtration unit also includes a first reflux line and a second reflux line, and the oleophobic ultrafiltration membrane filtration device is also provided with a first outlet and a second outlet; the inlet of the first reflux line is connected to the first outlet, and the outlet of the first reflux line is connected to the inlet of the oil-water separation device; the inlet of the second reflux line is connected to the second outlet, and the outlet of the second reflux line is connected to the inlet of the oleophobic ultrafiltration membrane filtration device.

[0008] In some embodiments, the oleophobic ultrafiltration membrane filtration unit also includes a circulation tank and a circulation pump, the inlet of the circulation tank is respectively connected to the outlet of the second reflux pipeline and the water phase outlet of the oil-water separation device; the outlet of the circulation tank is connected to the inlet of the oleophobic ultrafiltration membrane filtration device via the circulation pump.

[0009] In some embodiments, the high-precision oil-water separation system further includes: a reclaimed water reuse pipeline and a sludge dewatering water supply pipeline respectively connected to the outlet of the biochemical treatment device.

[0010] In some embodiments, the oil-water separation device is also provided with a heavy phase oil outlet and a light phase oil outlet; the oil-water separation unit also includes an oil recovery device and an oil return pipeline, the inlet of the oil return pipeline is respectively connected to the heavy phase oil outlet and the light phase oil outlet, and the outlet of the oil return pipeline is connected to the oil recovery device.

[0011] In some embodiments, the oleophobic ultrafiltration membrane in the oleophobic ultrafiltration membrane filtration device is a rolled ultrafiltration membrane.

[0012] In some embodiments, the oil-water separation device is a phase separator, and a fiber bed and a special plate group are provided in the phase separator; the fiber bed is woven from modified oil-repellent, water-repellent and corrosion-resistant fiber filaments.

[0013] In some embodiments, the oil content in the water discharged from the water phase outlet of the oil-water separation device is less than 50 ppm.

[0014] In some embodiments, the oil content in the water discharged from the oil removal wastewater outlet of the oleophobic ultrafiltration membrane filtration device is less than 10 ppm.

[0015] Compared with the prior art, the high-precision oil-water separation system provided by the utility model has the following beneficial effects:

[0016] 1. The utility model is provided with an oil-water separation unit and an oleophobic ultrafiltration membrane filtration unit to perform two oil removal treatments on the oily wastewater. The oil-water separation unit removes large-diameter oil droplets, and the high precision and oleophobicity of the oleophobic ultrafiltration membrane can completely remove small-diameter oil droplets to achieve high-precision oil removal. The wastewater after complete oil removal is then subjected to biochemical treatment. The two oil removal treatments can ensure that the oil content of the water entering the biochemical treatment device is below 10ppm, reduce the load of the biochemical treatment, and ensure stable operation;

[0017] 2. In the oleophobic ultrafiltration membrane filtration unit provided by the utility model, the small-diameter oil droplets intercepted by the oleophobic ultrafiltration membrane are re-input into the phase separator in the front-end oil-water separation unit. Under the action of the fiber bed with a special structure and the special plate group, the small-diameter oil droplets are further rebounded and collided to increase the size, thereby accelerating the sedimentation speed and improving the oil-water separation effect;

[0018] 3. The high-precision oil-water separation system provided by the utility model has only one oil phase outlet and one water phase outlet, and the overall water reuse rate is high. Moreover, the oil phase separated by the oil-water separation unit has a water content of less than 50ppm, which can be collected through the oil reuse pipeline and discharged into the oil reuse device for utilization. The purified water treated by the biochemical treatment device fully meets the discharge standard and can be directly discharged. It can also be used for reclaimed water reuse or sludge dehydration process. The resource utilization rate of the entire high-precision oil-water separation system is high;

[0019] 4. The high-precision oil-water separation system provided by the utility model also has the advantages of small footprint, low energy consumption, simple process operation, no need to invest in chemicals, and low investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0021] Figure 1 A schematic diagram of the structure of the high-precision oil-water separation system provided by the utility model;

[0022] Figure 2 This is a schematic structural diagram of a high-precision oil-water separation system in another embodiment of the present invention.

[0023] Description of Figure Numbers:

[0024] 1—oil-water separation unit; 101—oil-water separation device; 102—water phase outlet; 103—heavy phase oil outlet; 104—light phase oil outlet; 105—oil recycling pipeline;

[0025] 2—oleophobic ultrafiltration membrane filtration unit; 201—oleophobic ultrafiltration membrane filtration device; 202—oil removal wastewater outlet; 203—first outlet; 204—second outlet; 205—first return pipeline; 206—second return pipeline; 207—circulation tank; 208—circulation pump;

[0026] 3—Oily wastewater inlet pipe; 4—Biochemical treatment device; 5—Recycled water reuse pipeline; 6—Sludge dewatering water supply pipeline. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0028] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0029] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0031] Example 1

[0032] The utility model provides a high-precision oil-water separation system, such as Figure 1 As shown, it includes: an oily wastewater inlet pipe 3, an oil-water separation unit 100, an oleophobic ultrafiltration membrane filtration unit 200 and a biochemical treatment device 4.

[0033] Specifically, the oil-water separation unit 100 includes an oil-water separation device 101 , and the oil-water separation device 101 is provided with an inlet, a water phase outlet 102 and an oil phase outlet.

[0034] The oily wastewater inlet pipe 3 is connected to the inlet of the oil-water separator 101 so as to input the oily wastewater to be treated into the oil-water separator 101 and perform preliminary oil removal in the oil-water separator 101 .

[0035] The oil-water separation device 101 is preferably a phase separator, which can perform two-phase and three-phase separation on the oily wastewater. The phase separator is provided with a fiber bed and a special plate group, wherein the fiber bed is woven from modified oil-repellent, water-repellent and corrosion-resistant fiber filaments by a special weaving process, and the diameter of the fiber filaments is one twentieth of a hair, about 1 to 6 μm. The characteristics of the fiber bed can make the oil droplets in the oily wastewater rebound and collide on the surface of the fiber bed, increase the diameter of the oil droplets, and accelerate the sedimentation of the oil droplets.

[0036] The special plate group is formed by the accumulation of plates with special structures. The oil droplets enlarged by the fiber bed further rebound and collide on the surface of the special plate group to increase in size, further accelerating the sedimentation speed of the oil droplets.

[0037] The oleophobic ultrafiltration membrane filtration unit 200 includes an oleophobic ultrafiltration membrane filtration device 201, which is provided with an inlet and an oil-removed wastewater outlet 202. The inlet of the oleophobic ultrafiltration membrane filtration device 201 is connected to the water phase outlet 102 of the oil-water separation device 101, and the oil-removed wastewater outlet 202 is connected to the inlet of the biochemical treatment device 4.

[0038] Furthermore, the oleophobic ultrafiltration membrane filtration device 201 has a built-in oleophobic ultrafiltration membrane, which is a roll-type ultrafiltration membrane that can withstand a solid content of 20 g / L, breaking through the solid resistance limit of conventional roll-type membranes, and can withstand an oil content of 10,000 ppm.

[0039] The oil content of the wastewater after the initial oil removal decreases (for the convenience of expression, it is referred to as low-concentration oily wastewater below). Subsequently, the low-concentration oily wastewater enters the oleophobic ultrafiltration membrane filtration device 201 for secondary oil removal. The small-diameter oil droplets in the low-concentration oily wastewater are retained on the inner side of the membrane by the oleophobic ultrafiltration membrane, and water passes through the membrane layer to obtain the oil phase and the deoiled wastewater that fully meets the requirements of biochemical treatment. The deoiled wastewater is discharged into the biochemical treatment device 4 through the deoiled wastewater outlet 202, and the organic matter in the wastewater is removed by microorganisms to finally obtain purified water.

[0040] Furthermore, the present production also includes a reclaimed water reuse pipeline 5 and a sludge dewatering water supply pipeline 6 respectively connected to the outlet of the biochemical treatment device 4. The purified water obtained after two oil removals combined with biochemical treatments has reached the national emission standards and can be discharged directly. It can also be passed into the reclaimed water reuse pipeline 5 for reclaimed water reuse as needed, or passed into the sludge dewatering water supply pipeline 6 for the sludge dewatering process.

[0041] In this embodiment, the oil-water separator 101 is further provided with a heavy phase oil outlet 103 and a light phase oil outlet 104 . The heavy phase oil outlet 103 is preferably arranged at the bottom of the oil-water separator 101 , and the light phase oil outlet 104 is preferably arranged at the top of the oil-water separator 101 .

[0042] The oil phase separated from the initial oil removal of the oily wastewater is divided into heavy phase oil and light phase oil. The heavy phase oil can be discharged through the heavy phase oil outlet 103 , and the light phase oil can be discharged through the light phase oil outlet 104 .

[0043] More preferably, an oil return pipeline 105 and an oil recovery device (not shown in the figure) are also provided, the inlet of the oil return pipeline 105 is respectively connected to the heavy phase oil outlet 103 and the light phase oil outlet 104, and the outlet of the oil return pipeline 105 is connected to the oil recovery device, so that the separated light phase oil and heavy phase oil are reused according to demand.

[0044] In some embodiments, Figure 2 As shown, the above-mentioned oleophobic ultrafiltration membrane filtering device 201 is also provided with a first outlet 203 and a second outlet 204 .

[0045] The oleophobic ultrafiltration membrane filtration unit 200 also includes a first reflux pipeline 205 and a second reflux pipeline 206, wherein the inlet of the first reflux pipeline 205 is connected to the first outlet 203, and the outlet of the first reflux pipeline 205 is connected to the inlet of the oil-water separation device 101; the inlet of the second reflux pipeline 206 is connected to the second outlet 204, and the outlet of the second reflux pipeline 206 is connected to the inlet of the oleophobic ultrafiltration membrane filtration device 201.

[0046] The oil phase (mainly small-diameter oil droplets) separated by the oleophobic ultrafiltration membrane is divided into two paths. One part of the oil phase returns to the oil-water separation device 101 through the first reflux line 205, and rebounds and collides again in the phase separator to increase the diameter of the oil droplets. After sedimentation, it is recovered through the oil return line 105, while the other part of the oil phase re-enters the oleophobic ultrafiltration membrane filtration device 201 through the second reflux line 206 for circulating oil removal.

[0047] Furthermore, on the basis of the above-mentioned embodiment, the oleophobic ultrafiltration membrane filtration unit 200 also includes a circulation tank 207 and a circulation pump 208, the inlet of the circulation tank 207 is respectively connected to the outlet of the second reflux pipeline 206 and the water phase outlet 102 of the oil-water separation device 101, and the outlet of the circulation tank 207 is connected to the inlet of the oleophobic ultrafiltration membrane filtration device 201 via the circulation pump 208.

[0048] The circulation tank 207 mainly plays a buffering role, storing the low-concentration oily wastewater discharged from the oil-water separation device 101, and the oil phase returned from the second return pipe 206 to the oleophobic ultrafiltration membrane filtration device 201 for circulation treatment. This part of the oil phase, together with the low-concentration oily wastewater entering the circulation tank 207, maintains the stability of the oil content of the oily wastewater in the circulation tank 207.

[0049] The circulation pump 208 increases the pressure of the oily wastewater and provides conveying power.

[0050] In summary, in the high-precision oil-water separation system provided by the utility model, the phase separator can remove oil droplets with a diameter of more than 1um in the oil-containing wastewater, and the oleophobic ultrafiltration membrane can intercept oil droplets with a diameter of less than 1um. After the oil droplets with a diameter of less than 1um enter the oleophobic ultrafiltration membrane filtration device 201 along with the water phase, the oil droplets with a diameter of less than 1um are intercepted by the oleophobic ultrafiltration membrane and sent back to the phase separator, and the oil droplets with a diameter of less than 1um collide and grow in the phase separator, and then settle and separate and are sent to the oil recovery device through the oil recycling pipeline 105.

[0051] The oil content in the water discharged from the water phase outlet 102 of the oil-water separation device 201 is less than 50 ppm, and the oil content in the water discharged from the oil removal wastewater outlet 202 of the oleophobic ultrafiltration membrane filtration device 201 is less than 10 ppm.

[0052] It should be noted that in the actual purification process, depending on the oil content of the oily wastewater, the oleophobic ultrafiltration membrane filtration device 201 in the oleophobic ultrafiltration membrane filtration unit 200 can be used alone to treat low-concentration oily wastewater, or the oil-water separation unit 100 and the oleophobic ultrafiltration membrane filtration unit 200 can be used in combination to treat high-concentration oily wastewater.

[0053] On the basis of the above, the utility model also provides a process flow of the high-precision oil-water separation system, including the following steps:

[0054] The oily wastewater inlet pipe 3 introduces the oily wastewater to be treated into the oil-water separation device 101, and the oily wastewater undergoes preliminary oil-water separation in the phase separator, and the separated heavy phase oil and light phase oil are discharged into the oil recycling pipeline 105 through the heavy phase oil outlet 103 and the light phase oil outlet 104 respectively. The low-concentration wastewater after preliminary oil removal enters the circulation tank 207 for temporary storage, and enters the oil-phobic ultrafiltration membrane filtration device 201 after being pressurized by the circulation pump 208.

[0055] The oil droplets that are not removed in the low-concentration oily wastewater are further removed due to the oleophobicity and absolute accuracy of the oleophobic ultrafiltration membrane, and the oil droplets are retained on the inner side of the membrane. The deoiled water passes through the membrane layer and is sent to the biochemical treatment device 4, while the retained oil phase is divided into two paths, one of which is discharged into the second reflux pipeline 206 through the second outlet 204 and sent to the circulation tank 207, and enters the oleophobic ultrafiltration membrane filtration device 201 together with the wastewater from which the oil has been initially removed, for secondary deoiling.

[0056] The other route is discharged into the first reflux pipeline 205 through the first outlet 203 and sent to the oil-water separation device 101, i.e., the phase separator. The small-diameter oil droplets further rebound and grow under the action of the fiber bed and special plate group in the phase separator, and the large-diameter oil droplets are precipitated, separated and reused.

[0057] The deoiled wastewater is purified by the microorganisms in the biochemical treatment device 4 , and the purified water meets the discharge standard and can be discharged directly, or discharged into the reclaimed water reuse pipeline 5 , or discharged into the sludge dewatering water supply pipeline 6 .

[0058] Example 2

[0059] In combination with the above embodiments, the present invention provides a specific implementation method:

[0060] Oily wastewater treatment capacity is 10m 3 / h, pressure is 2 kg, temperature is 40°C, oil content is 500ppm, water phase density is 995kg / m 3 , light phase oil density is 850kg / m 3 , the density of heavy phase oil is 1300kg / m 3 .

[0061] The oily wastewater enters the phase separator through the oily wastewater inlet pipe 3. After the oily wastewater is treated by the phase separator, the light phase oil in the oily wastewater (the light phase oil flow rate is about 1L / h, and the water content is less than 50ppm) enters the oil recycling pipeline 105 through the light phase oil outlet 104, and the heavy phase oil in the oily wastewater (the heavy phase oil flow rate is about 4L / h, and the water content is less than 50ppm) enters the oil recycling pipeline 105 together with the light phase oil through the heavy phase oil outlet 103, and then is discharged from the system for oil recycling; the oily wastewater after preliminary oil removal by the phase separator (the water phase flow rate is about 10m 3 / h, oil content <50ppm) enters the circulation tank 207 through the water phase outlet 102 to wait for further purification of the oily wastewater.

[0062] The oily wastewater entering the circulation tank 207 is pressurized by the circulation pump 208 and then enters the oleophobic ultrafiltration membrane filtration device 201. After the initial oil removal, the wastewater is treated by the oleophobic ultrafiltration membrane to obtain a clear liquid (oil-removed wastewater) and a concentrated liquid (oil phase). The oil-removed wastewater (the flow rate of the oil-removed wastewater is about 10m 3 / h, oil content <10ppm) enters the biochemical treatment device 4 through the oil removal wastewater outlet 202, and the oil phase returns to the circulation tank 207 through the second outlet 204, thereby ensuring the circulation flow rate of the circulation pump 208 at 40m 3 / h, while increasing the oil content in the circulation tank 207 to 500ppm.

[0063] When the oil content in the circulation tank 207 reaches 500 ppm, the pipeline is switched so that a portion of the oil phase (oil phase flow rate is about 1m 3 / h, oil content is 500ppm) returns to the phase separator through the first outlet 203 for preliminary oil removal and purification again; the other part of the oil phase (oil phase flow rate is about 39m 3 / h, oil content 500ppm) enters the circulation tank 207 through the second outlet 204, and along with the preliminary oil-removed wastewater in the circulation tank 207, it enters the oleophobic ultrafiltration membrane filtration device 201 for purification treatment again (the oil concentration in the circulation tank 207 and the circulation flow of the circulation pump 208 continue to be maintained).

[0064] The wastewater entering the biochemical treatment device 4 is the wastewater that has been purified by two oil removals. One stream of the purified water obtained after treatment by the biochemical treatment device 4 is discharged from the system through the reclaimed water reuse pipeline 5, that is, it meets the national emission standards or is reused for reclaimed water; the other stream is discharged from the system through the sludge dewatering water supply pipeline 6 for sludge dewatering treatment.

[0065] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A high-precision oil-water separation system, characterized in that: include: Oily wastewater inlet pipe, oil-water separation unit, oleophobic ultrafiltration membrane filtration unit and biochemical treatment device; The oil-water separation unit comprises an oil-water separation device, the inlet of which is connected to the oily wastewater inlet pipe; The oleophobic ultrafiltration membrane filtration unit includes an oleophobic ultrafiltration membrane filtration device, the water phase outlet of the oil-water separation device is connected to the inlet of the oleophobic ultrafiltration membrane filtration device; the oil-removed wastewater outlet of the oleophobic ultrafiltration membrane filtration device is connected to the inlet of the biochemical treatment device.

2. The high-precision oil-water separation system according to claim 1, characterized in that: The oleophobic ultrafiltration membrane filtration unit further comprises a first reflux pipeline and a second reflux pipeline, and the oleophobic ultrafiltration membrane filtration device further comprises a first outlet and a second outlet; The inlet of the first reflux pipeline is connected to the first outlet, and the outlet of the first reflux pipeline is connected to the inlet of the oil-water separation device; The inlet of the second reflux pipeline is connected to the second outlet, and the outlet of the second reflux pipeline is connected to the inlet of the oleophobic ultrafiltration membrane filtering device.

3. The high-precision oil-water separation system according to claim 2, characterized in that: The oleophobic ultrafiltration membrane filtration unit also includes a circulation tank and a circulation pump. The inlet of the circulation tank is connected to the outlet of the second reflux pipeline and the water phase outlet of the oil-water separation device respectively; The outlet of the circulation tank is connected to the inlet of the oleophobic ultrafiltration membrane filtering device via the circulation pump.

4. The high-precision oil-water separation system according to claim 1, characterized in that: Also includes: A reclaimed water recycling pipeline and a sludge dewatering water supply pipeline are respectively connected to the outlet of the biochemical treatment device.

5. The high-precision oil-water separation system according to claim 1, characterized in that: The oil-water separation device is also provided with a heavy phase oil outlet and a light phase oil outlet; The oil-water separation unit further comprises an oil recovery device and an oil recycling pipeline, wherein the inlet of the oil recycling pipeline is respectively connected to the heavy phase oil outlet and the light phase oil outlet, and the outlet of the oil recycling pipeline is connected to the oil recovery device.

6. The high-precision oil-water separation system according to claim 1, characterized in that: The oleophobic ultrafiltration membrane in the oleophobic ultrafiltration membrane filtering device is a rolled ultrafiltration membrane.

7. The high-precision oil-water separation system according to claim 1, characterized in that: The oil-water separation device is a phase separator, and a fiber bed and a special plate group are provided in the phase separator; The fiber bed is woven from modified oil-repellent, water-repellent and corrosion-resistant fiber filaments.

8. The high-precision oil-water separation system according to claim 1, characterized in that: The oil content in the water discharged from the water phase outlet of the oil-water separation device is less than 50 ppm.

9. The high-precision oil-water separation system according to claim 1, characterized in that: The oil content in the water discharged from the oil removal wastewater outlet of the oleophobic ultrafiltration membrane filtration device is less than 10 ppm.

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