阅读说明：本技术 便于性能评价的膜滤-聚结耦合的含油污水处理实验系统 (Membrane filtration-coalescence coupling oily sewage treatment experimental system convenient for performance evaluation ) 是由 桑义敏 何燎 刘晗 韩严和 陈家庆 胡建龙 于 2019-08-28 设计创作，主要内容包括：本发明公开了一种便于性能评价的膜滤-聚结耦合的含油污水处理实验系统,包括：原水槽下部设第一排空阀；原水槽的出水管上依次设驱动泵、第一压力表、第一取样阀和流量计,与聚结-过滤耦合分离器前端设置的进水管道连接；聚结-过滤耦合分离器的后端设置出水管道,经设置第五取样阀的管路与出水槽连接；聚结-过滤耦合分离器上分别设第二压力表、第二取样阀、第三取样阀和第四取样阀；出水槽下部设第二排空阀。该实验系统通过聚结材料和膜过滤过程中发生的膜孔内聚结提高油水分离效率；能评价条形聚结材料、分离膜前表面的以及分离膜内壁以及膜后表面的聚结性能；能评价分离膜本身的过滤性能；能根据研究需要和分离需要,进行功能的选取和组合。(The invention discloses a membrane filtration-coalescence coupling oily sewage treatment experiment system convenient for performance evaluation, which comprises: the lower part of the raw water tank is provided with a first emptying valve; a driving pump, a first pressure gauge, a first sampling valve and a flowmeter are sequentially arranged on a water outlet pipe of the raw water tank and are connected with a water inlet pipeline arranged at the front end of the coalescence-filtration coupling separator; the rear end of the coalescence-filtration coupling separator is provided with a water outlet pipeline which is connected with a water outlet tank through a pipeline provided with a fifth sampling valve; the coalescence-filtration coupling separator is respectively provided with a second pressure gauge, a second sampling valve, a third sampling valve and a fourth sampling valve; the lower part of the water outlet groove is provided with a second emptying valve. The experimental system improves the oil-water separation efficiency through coalescence of the coalescence material and the cohesion of the membrane pores generated in the membrane filtration process; the coalescence properties of the strip-shaped coalescence material, the front surface of the separation membrane, the inner wall of the separation membrane and the rear surface of the membrane can be evaluated; the filtration performance of the separation membrane can be evaluated; the selection and combination of functions can be carried out according to research needs and separation needs.)

1. A membrane filtration-coalescence-coupled oily-wastewater treatment experimental system facilitating performance evaluation, comprising: the system comprises a first emptying valve, a raw water tank, a driving pump, a first pressure gauge, a first sampling valve, a second pressure gauge, a second sampling valve, a third sampling valve, a fourth sampling valve, a flow meter, a coalescence-filtration coupling separator, a fifth sampling valve, a water outlet tank and a second emptying valve; wherein the content of the first and second substances,

the lower part of the raw water tank is provided with the first emptying valve;

the driving pump, the first pressure gauge, the first sampling valve and the flowmeter are sequentially arranged on a water outlet pipe of the raw water tank, and the water outlet pipe is connected with a water inlet pipeline arranged at the front end of the coalescence-filtration coupling separator;

the rear end of the coalescence-filtration coupling separator is provided with a water outlet pipeline which is connected with the water outlet tank through a pipeline provided with a fifth sampling valve;

the coalescence-filtration coupling separator is respectively provided with a second pressure gauge, a second sampling valve, a third sampling valve and a fourth sampling valve;

the lower part of the water outlet groove is provided with the second emptying valve.

2. The membrane filtration-coalescence-coupled oily-wastewater treatment experimental system facilitating performance evaluation according to claim 1, wherein the coalescence-filtration coupled separator comprises:

the device comprises a fixed support, a transparent cylinder, a front flange cover, a rear flange cover, a first porous plate, a second porous plate and a strip-shaped coalescence component; wherein the content of the first and second substances,

the transparent cylinder is transversely arranged on the fixed bracket;

a front flange cover is fixedly installed on the front end opening of the transparent cylinder, a water inlet is formed in the middle of the front flange cover, the outside of the water inlet is connected with a water inlet pipeline, a rear flange cover is fixedly installed on the rear end opening of the transparent cylinder, a water outlet is formed in the middle of the rear flange cover, and the outside of the water outlet is connected with a water outlet pipeline;

the transparent cylinder is internally provided with a first porous plate, a strip-shaped coalescence material, a separation membrane and a second porous plate from front to back in sequence.

3. The experimental system for membrane filtration-coalescence-coupled oily wastewater treatment convenient for performance evaluation as claimed in claim 2, wherein the first porous plate is fixed at the front end in the transparent cylinder through a plurality of supports arranged at the front end of the inner wall of the transparent cylinder, and a space is kept between the first porous plate and the front flange cover;

one end of the strip-shaped coalescence material is fixed on the first porous plate, and the other end of the strip-shaped coalescence material is a free end;

the separation membrane is attached to the second porous plate;

the second porous plate is fixed at the rear end in the transparent cylinder body through a plurality of supporting bodies arranged at the rear end of the inner wall of the transparent cylinder body, and an interval is kept between the second porous plate and the rear flange cover;

the second pressure gauge is arranged on the pipe wall of the middle section of the transparent cylinder;

the second sampling valve is arranged outside the transparent cylinder between the strip-shaped coalescence material and the separation membrane;

the third sampling valve and the fourth sampling valve are respectively arranged at the outer part of the transparent cylinder body tightly attached to the front end of the separation membrane, and the third sampling valve and the fourth sampling valve are respectively arranged at the upper end position and the lower end position of the transparent cylinder body.

4. The membrane filtration-coalescence-coupled oily-wastewater treatment experimental system convenient for performance evaluation according to claim 3, wherein the spacing between the first porous plate and the front flange cover is 0.11 m;

the distance between the second porous plate and the rear flange cover is 0.08 m;

the installation positions of the third sampling valve and the fourth sampling valve are 5mm away from the separation membrane.

5. The membrane filtration-coalescence-coupled oily water treatment experimental system convenient for performance evaluation as claimed in claim 2 or 3, wherein the outer diameter of the first porous plate is matched with the inner diameter of the transparent cylinder, and 14 through holes with the diameter of 5mm are uniformly arranged on the first porous plate;

the external diameter of the second perforated plate is matched with the internal diameter of the transparent cylinder, and at least 20 through holes are uniformly distributed in the second perforated plate.

6. The membrane filtration-coalescence-coupled oily-wastewater treatment experimental system convenient for performance evaluation according to claim 4, wherein each through-hole of the second perforated plate has a diameter of 5mm or less.

7. The experimental system for membrane filtration-coalescence-coupled oily wastewater treatment convenient for performance evaluation as claimed in claim 2 or 3, wherein the effective length between the front and rear flange covers in the transparent cylinder is 1.0m, and the inner diameter of the transparent cylinder is 50 mm.

8. The membrane filtration-coalescence-coupled oily-wastewater treatment experimental system convenient for performance evaluation according to claim 2 or 3, wherein the coalescence-filtration coupled separator further comprises:

the front separation membrane is tightly attached to the water inlet surface of the first porous plate.

Technical Field

The invention relates to the field of sewage treatment, in particular to a membrane filtration-coalescence coupling oily sewage treatment experimental system convenient for performance evaluation.

Background

In the petroleum and petrochemical industry, a large amount of oil-containing sewage such as oil extraction sewage, oil refining sewage and the like is generated every year. At present, most oil fields in China enter the middle and later stages of exploitation, and with the development of secondary or tertiary oil recovery technology, the water content of oil field produced liquid is continuously increased, so that a large amount of oil extraction sewage is generated, and further treatment is needed to avoid environmental pollution and reduce emission or reinjection into the underground to recover water resources. In addition, industries such as steel, machining, food, etc. also generate a large amount of oily sewage, which brings harm and challenge to ecological environment and human health. Under the background, novel and efficient oily sewage treatment technology and equipment are urgently needed objectively. The research on the oily sewage treatment technology is mostly to carry out the test in a laboratory and then carry out the debugging or the application expansion test in the industrial fields of oil fields, petrochemical industry and the like. Thus, the emergence and development of new processing techniques and mechanisms are of particular importance.

In the practice of oily wastewater treatment, coalescence and membrane separation are two important oil-water separation units. During the tests, the inventors found that there was a more pronounced coalescence of the oil droplets during the membrane separation process, for two possible reasons: firstly, the wetting and coalescence of the surface of the membrane material; the second is the squeezing and merging action of oil drops when the oil drops pass through the membrane pores. The method is a novel research field, and besides only a few foreign documents, related reports are rare, so that the research has a good innovative significance. However, no experimental facility or system for carrying out the research is needed at present.

Disclosure of Invention

Based on the problems in the prior art, the invention aims to provide a membrane filtration-coalescence coupled oily sewage treatment experimental system convenient for performance evaluation, which can solve the problem that the research on the coalescence mechanism of membrane separation oil drops cannot be well carried out without experimental equipment or a system for researching the obvious coalescence phenomenon of the oil drops in the membrane separation process.

The purpose of the invention is realized by the following technical scheme:

the embodiment of the invention provides a membrane filtration-coalescence coupling oily sewage treatment experimental system convenient for performance evaluation, which is characterized by comprising: the system comprises a first emptying valve, a raw water tank, a driving pump, a first pressure gauge, a first sampling valve, a second pressure gauge, a second sampling valve, a third sampling valve, a fourth sampling valve, a flow meter, a coalescence-filtration coupling separator, a fifth sampling valve, a water outlet tank and a second emptying valve; wherein the content of the first and second substances,

the lower part of the raw water tank is provided with the first emptying valve;

the driving pump, the first pressure gauge, the first sampling valve and the flowmeter are sequentially arranged on a water outlet pipe of the raw water tank, and the water outlet pipe is connected with a water inlet pipeline arranged at the front end of the coalescence-filtration coupling separator;

the rear end of the coalescence-filtration coupling separator is provided with a water outlet pipeline which is connected with the water outlet tank through a pipeline provided with a fifth sampling valve;

the coalescence-filtration coupling separator is respectively provided with a second pressure gauge, a second sampling valve, a third sampling valve and a fourth sampling valve;

the lower part of the water outlet groove is provided with the second emptying valve.

According to the technical scheme provided by the invention, the membrane filtration-coalescence coupling oily sewage treatment experimental system convenient for performance evaluation provided by the embodiment of the invention has the beneficial effects that:

through the coalescence-filtration coupling separator, and the raw water tank, the driving pump, the first pressure gauge, the first sampling valve, the second pressure gauge, the second sampling valve, the third sampling valve, the fourth sampling valve, the flowmeter, the fifth sampling valve and the water outlet tank are organically connected, an experimental system which integrates coalescence and filtration and is convenient for performance evaluation is formed, and the oil-water separation efficiency can be improved through the strip-shaped coalescence material in the coalescence-filtration coupling separator and the membrane pore cohesion generated in the membrane filtration process. The experimental system can meet the requirements of innovative research contents and overcome the defect that the device in the prior art only has oil-water separation or single function of experimental research.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic diagram of a membrane filtration-coalescence-coupled oily wastewater treatment experimental system for facilitating performance evaluation, provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram showing the configuration of a coalescence-filtration coupled separator in an experimental system according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the first perforated plate at A-A of the coalescing-filtration coupled separator of FIG. 2;

FIG. 4 is a schematic cross-sectional view of a second perforated plate at B-B of the coalescing-filtration coupled separator of FIG. 2;

FIG. 5 is a diagram showing a distribution of particle sizes of oil droplets in incoming water and outgoing water of a separation membrane in a sewage treatment performed by the experimental system according to the embodiment of the present invention;

the part names corresponding to the marks in the figure are as follows: 1-a first purge valve; 2-raw water tank; 3-driving the pump; 4-a first sampling valve; 5-a first pressure gauge; 6-a flow meter; 7-coalescence-filtration coupled separators; 8-front flange cover; 9-a first perforated plate 1; 10-a strip of coalescing material; 11-a second pressure gauge; 12-a second sampling valve; 13-a third sampling valve; 14-a fourth sampling valve; 15-a separation membrane; 16-a second perforated plate; 17-rear flange cover; 18-a fifth sample valve; 19-water outlet groove; 20-a second evacuation valve; 21-a water inlet pipeline; 22-an outlet conduit; 23-pre separation membrane.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.

As shown in fig. 1, an embodiment of the present invention provides a membrane filtration-coalescence coupled oily wastewater treatment experimental system for facilitating performance evaluation, including: the system comprises a first emptying valve, a raw water tank, a driving pump, a first pressure gauge, a first sampling valve, a second pressure gauge, a second sampling valve, a third sampling valve, a fourth sampling valve, a flow meter, a coalescence-filtration coupling separator, a fifth sampling valve, a water outlet tank and a second emptying valve; wherein the content of the first and second substances,

the lower part of the raw water tank is provided with the first emptying valve;

the driving pump, the first pressure gauge, the first sampling valve and the flowmeter are sequentially arranged on a water outlet pipe of the raw water tank, and the water outlet pipe is connected with a water inlet pipeline arranged at the front end of the coalescence-filtration coupling separator;

the rear end of the coalescence-filtration coupling separator is provided with a water outlet pipeline which is connected with the water outlet tank through a pipeline provided with a fifth sampling valve;

the coalescence-filtration coupling separator is respectively provided with a second pressure gauge, a second sampling valve, a third sampling valve and a fourth sampling valve;

the lower part of the water outlet groove is provided with the second emptying valve.

As shown in fig. 2, in the above experimental system, the coalescence-filtration coupled separator includes:

the device comprises a fixed support, a transparent cylinder, a front flange cover, a rear flange cover, a first porous plate, a second porous plate and a strip-shaped coalescence component; wherein the content of the first and second substances,

the transparent cylinder is transversely arranged on the fixed bracket;

a front flange cover is fixedly installed on the front end opening of the transparent cylinder, a water inlet is formed in the middle of the front flange cover, the outside of the water inlet is connected with a water inlet pipeline, a rear flange cover is fixedly installed on the rear end opening of the transparent cylinder, a water outlet is formed in the middle of the rear flange cover, and the outside of the water outlet is connected with a water outlet pipeline;

the transparent cylinder is internally provided with a first porous plate, a strip-shaped coalescence material, a separation membrane and a second porous plate from front to back in sequence.

In the experimental system, a first porous plate is fixed at the front end in the transparent cylinder body through a plurality of supporting bodies arranged at the front end of the inner wall of the transparent cylinder body, and an interval is kept between the first porous plate and the front flange cover; preferably, the distance between the first perforated plate and the front flange cover is 0.11 m; thus facilitating water inlet and distribution;

one end of the strip-shaped coalescence material is fixed on the first porous plate, and the other end of the strip-shaped coalescence material is a free end;

the separation membrane is attached to the second porous plate;

the second porous plate is fixed at the rear end in the transparent cylinder body through a plurality of supporting bodies arranged at the rear end of the inner wall of the transparent cylinder body, and an interval is kept between the second porous plate and the rear flange cover; preferably, the distance between the second perforated plate and the rear flange cover is 0.08 m; thus facilitating water outlet;

the second pressure gauge is arranged on the pipe wall of the middle section of the transparent cylinder;

the second sampling valve is arranged outside the transparent cylinder between the strip-shaped coalescence material and the separation membrane; preferably, the strip-shaped coalescent material is a soft structure composed of a strip-shaped coalescent soft material;

the third sampling valve and the fourth sampling valve are respectively arranged at the outer part of the transparent cylinder body tightly attached to the front end of the separation membrane, and the third sampling valve and the fourth sampling valve are respectively arranged at the upper end position and the lower end position of the transparent cylinder body.

The installation positions of the third sampling valve and the fourth sampling valve are 5mm away from the separation membrane. The water before the separation membrane is convenient to sample, and in use, the water sample obtained by the third sampling valve and the water sample obtained by the fourth sampling valve can be uniformly mixed and then used as the water sample before the separation membrane for subsequent analysis and research.

Referring to fig. 3, the outer diameter of the first porous plate is matched with the inner diameter of the transparent cylinder, and 14 through holes with the diameter of 5mm are uniformly distributed on the first porous plate;

referring to fig. 4, the outer diameter of the second porous plate is matched with the inner diameter of the transparent cylinder, and at least 20 through holes are uniformly arranged on the second porous plate. Preferably, each of the through holes of the second porous plate has a diameter of 5mm or less.

In the above experimental system, the effective length between the front and rear flange covers in the transparent cylinder is 1.0m, and the inner diameter of the transparent cylinder is 50 mm.

The experimental system is an oily sewage treatment and performance evaluation test platform integrating coalescence and filtration, and improves the efficiency of oil-water separation by the cohesion of strip-shaped coalescence materials and membrane pores generated in the process of membrane filtration. The experimental system has the following functions of high-efficiency oil-water separation and other multiple performance evaluation: evaluating the coalescence performance of the strip-shaped coalescence material prepared into the strip-shaped coalescence material; evaluating the coalescence performance of the front surface of the separation membrane; thirdly, evaluating the filtering performance of the separation membrane; and fourthly, the coalescence performance of the inner wall of the separation membrane and the rear surface of the separation membrane.

The embodiments of the present invention are described in further detail below.

As shown in FIG. 1, the embodiment of the present invention provides a membrane filtration-coalescence coupling oily sewage treatment experimental system convenient for performance evaluation, when the system is used, oily sewage is placed in a raw water tank 2, a first emptying valve 1 is installed at the lower end of the left side of the raw water tank 2, the oily sewage in the raw water tank 2 is pumped into a water inlet pipe through a driving pump 3, sequentially flows through a valve installed on the water inlet pipe, a first sampler 4, a first pressure gauge 5 and a flowmeter 6, reads a flow value, then enters a coalescence-filtration coupling separator 7 through a water inlet pipeline 21 connected with a water inlet at the center of a front flange cover 8 of the coalescence-filtration coupling separator 7, enters the oily sewage of the coalescence-filtration coupling separator 7, firstly passes through a first porous plate 9, and then passes through a strip-shaped coalescence material 10 hung on the first porous plate 9 along the axial direction of a transparent cylinder of the separator, then flows through the separation membrane 15 and the second porous plate 16 which plays a supporting role after the separation membrane 15 in sequence, and finally flows out of the coalescence-filtration coupling separator through the central water outlet of the rear flange cover 17 and the water outlet pipeline.

In the above experimental system, the effective length (between the front and rear flange covers) of the transparent cylinder of the coalescing-filtering coupled separator 7 was 1.0m, and the inner diameter was 50 mm. In order to facilitate observation of the test phenomenon, the transparent cylinder is made of organic glass or other transparent materials; a space of 0.11m is reserved between the first porous plates 9 at the water inlet of the transparent cylinder body, so that the effect of uniform water distribution is achieved; the front flange cover and the rear flange cover can be conveniently disassembled on the transparent cylinder body, and the first porous plate, the second porous plate, the strip-shaped coalescent material 10 and the separation membrane 15 which are arranged in front of and behind the transparent cylinder body can be replaced according to the research needs. Both perforated plates are supported by 3 or 5 bar supports fixed on the inner wall of the transparent cylinder of the separator, so that the front bar-shaped coalescent material 10 swings with the water flow without running off, and the rear separation membrane 15 is attached to the second perforated plate 16 under the action of the water flow, and the distance between the second perforated plate 16 and the rear flange cover of the separator is 0.08 m.

In the coalescence-filtration coupled separator 7, the outer diameter of a first perforated plate 9 is 50mm, and 14 circular through holes with the diameter of 5mm are uniformly arranged on the first perforated plate 9 so as to bind a strip-shaped coalescence material 10 required by research; the second perforated plate 16 also has an outer diameter of 50mm and the number of small circular holes in its face plate is 20 or more (the more the better), or other porous materials that can be used as membrane material supports can be used instead.

The front surface of the second perforated plate 16 is provided with test separation membranes 15 with different filtration characteristics and different layers, the separation membranes 15 are tightly attached to the front surface (the distance is 5mm) of the separation membrane 15, and the outer wall of a transparent cylinder of the separator is provided with a third sampling valve 13; the third sampling valve 13 represents the water sampling property at the front surface of the separation membrane 15, and since the large surface of the separation membrane 15 makes the single sampling non-representative, the fourth sampling valve 14 is also installed at the same position at the lower end of the third sampling valve 13 in the vertical direction, and the samples of the third sampling valve 13 and the fourth sampling valve 14 are uniformly mixed to be used as the sample of the sampling valve at the position. A second pressure gauge 5 is installed on the wall of the middle section of the transparent cylinder of the coalescence-filtration coupling separator 7 for measuring the pressure, and a valve is installed on the wall of the transparent cylinder behind the strip-shaped coalescence material 10 and in front of the separation membrane 15 as a second sampling valve 12.

The above coalescence-filtration coupled separator further includes: and the front separation membrane 23 is tightly attached to the water inlet surface of the first porous plate. Can conveniently control the particle size of the entering oily sewage.

The oily sewage treated by the coalescence-filtration coupling separator 7 flows into a water outlet tank 19 after passing through a fifth sampling valve 18 on a water outlet pipe, and a second emptying valve 20 is arranged at the lower end of the right side of the water outlet tank 19.

Based on the above structure and flow of the present invention, the implementation approach for realizing the established function objective, that is, the working principle, is as follows:

the experimental system structurally comprises two units, namely a coalescence unit and a membrane filtration unit; the functions of the method comprise the high-efficiency oil-water separation of oily sewage, the filtration and the classification evaluation of coalescence characteristics.

Firstly, according to the invention, the efficient oil-water separation of oily sewage can be realized through the coalescence of the strip-shaped coalescence material and the synergistic coupling effects of the filtration effect, the front and back surface coalescence and the like of the separation membrane, which is the primary functional target of the invention.

In addition, the evaluation of filtration, coalescence properties contains a number of functional objectives. The coalescence properties of the strip-shaped coalescence material can be evaluated by comparing the two water samples of the first sampling valve 4 and the second sampling valve 12: after the oily sewage passes through the porous plate bound with the coalescence material, the oily sewage is fully contacted with the coalescence material, so that the particle size of oil drops in the sewage is generally increased, and the oil drops are coalesced. The surface coalescence property of the front surface of the separation membrane 15 can be evaluated by comparing the water samples taken by the second sampling valve 12 (water sample before coalescence) and the third sampling valve 13 and the fourth sampling valve 14 (both are mixed as water sample after coalescence). The oil content in the water sample at the fifth sampling valve 18 is reduced and the oil drop size is significantly reduced compared to the water samples of the third sampling valve 13 and the fourth sampling valve 14, revealing the filtering action of the separation membrane 15 itself. Comparing the particle size distribution of the oil drops in the water sample of the fifth sampling valve 18 with the aperture and the distribution of the aperture of the separation membrane, it can be obviously found that the particle size of a certain amount of oil drops is obviously larger than the aperture of the membrane, which is caused by the coalescence performance of the inner wall of the separation membrane and the rear surface of the membrane, so that the oil drops in the oily sewage have obvious coalescence phenomenon in the membrane separation process. Therefore, by analyzing the water sample of the third sampling valve 13 (including the sample of the fourth sampling valve 14) and the water sample of the fifth sampling valve 18 in combination with the membrane pore size, the coalescence property in the separation membrane and the membrane rear surface can be evaluated.

Based on the phenomena and the principle of the invention, the invention can objectively and effectively evaluate the coalescence performance of the strip-shaped coalescence material, the filtration performance of the separation membrane, the inner wall of the separation membrane and the coalescence performance of the surface of the separation membrane so as to meet the actual requirements of different research subjects.

If the coalescence performance of the strip-shaped coalescence material is to be evaluated, a separation membrane is not required to be installed in front of the first porous plate 9 and the second porous plate 16, and the evaluation target can be realized only by binding the coalescence material on the first porous plate 9 and comparing the physicochemical characteristics of the oil drop particle size distribution and the like of the first sampling valve 4 and the second sampling valve 12 before and after the coalescence material.

In order to better evaluate the coalescence performance of the front surface of the separation membrane, the front separation membrane 23 is installed in front of the second porous plate 16, and no coalescence material is bound to the first porous plate 9, so that the evaluation object can be achieved by comparing the physicochemical characteristics such as the oil drop particle size distribution of the second sampling valve 12 and the third sampling valve 13 (including the sampling of the fourth sampling valve 14). In order to control the physical and chemical properties of the second sampling valve 12, such as the oil droplet size distribution (meeting the needs of research), front separation membranes 23 with different pore diameters may be placed in front of the first porous plate 9.

If the filtration performance of the separation membrane is to be evaluated, the separation membrane is only required to be arranged in front of the second porous plate 16, no coalescing material is required to be bound on the first porous plate 9, and the evaluation target can be realized by comparing the physical and chemical properties such as the oil content and the oil drop particle size distribution of the third sampling valve 13 (including the sampling of the fourth sampling valve 14) and the fifth sampling valve 18. Similarly, in order to control the physical and chemical properties such as the oil droplet size distribution of the third sampling valve 13 (including the sampling of the fourth sampling valve 14) (to meet the needs of the research subject), front separation membranes 23 having different pore sizes may be placed in front of the first porous plate 9.

If the coalescence performance of the inside of the pores of the separation membrane and the rear surface of the membrane is to be evaluated, the separation membrane is only required to be arranged in front of the second porous plate 16, the first porous plate 9 is not required to be bound with the coalescence material, the particle size distribution of oil drops in the water sample of the fifth sampling valve 18 is compared with the pore size and the distribution of the pore size of the separation membrane, the particle size of a certain amount of oil drops can be found to be obviously larger than the pore size of the membrane, and the coarse graining degree reflects the coalescence performance of the inside of the pores of the separation membrane.

Compared with the prior art, the invention has the following advantages: firstly, the efficiency of oil-water separation is improved through coalescence of a coalescence material and film pores generated in the film filtering process; secondly, the coalescence performance of the strip-shaped coalescence material can be evaluated; thirdly, the surface coalescence performance of the front surface of the separation membrane can be evaluated; fourthly, evaluating the filtering performance of the separation membrane; evaluating the coalescence performance of the inner wall of the separation membrane and the rear surface of the membrane; the selection and combination of the functions can be carried out according to research needs and separation needs, and the types and the number of the coalescent materials and the types and the number of layers of the separation membranes can be conveniently adjusted, so as to meet the needs of innovative research.

In order to clearly and completely describe the technical scheme of the invention, the following embodiments are provided. Of course, the embodiments provided herein are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art can obtain the embodiments without creative efforts, and the embodiments belong to the protection scope of the present invention.