Small aggregation-induced oil-water separation testing device

Abstract

The utility model relates to a small aggregation-induced oil-water separation testing device which comprises a tank body, the demulsification filter element is located in the tank body, the demulsification filter element is provided with an inner cavity and a demulsification layer defining the inner cavity, and the demulsification layer is formed by winding multiple layers of demulsification function filter materials; the separation filter element is located in the tank body, the separation filter element is provided with an inner cavity and a separation layer defining the inner cavity, and the separation layer is formed by winding multiple layers of filter materials with an oil-water separation function and is used for carrying out oil-water separation on the demulsified liquid penetrating through the separation layer from outside to inside; the liquid inlet is positioned on the tank body, is communicated with the inner cavity of the demulsification filter element and is used for inputting oil-water emulsion into the inner cavity of the demulsification filter element; and the liquid outlet is positioned on the tank body, is communicated with the inner cavity of the separation filter element and is used for discharging liquid in the inner cavity of the separation filter element. According to the utility model, the problems that the currently adopted equipment is only limited to verify partial performance of a single-layer filter material and cannot show the demulsification separation performance after the combination of multiple layers of filter materials are solved.

Description

Technical Field

[0001] This utility model relates to the field of oil-water separation technology, and in particular to a small aggregation-induced oil-water separation testing device. Background Technology

[0002] Wastewater treatment plants need to reduce the volume of oily wastewater generated at the end of different processes to meet the requirements for biological influent.

[0003] Currently, oil-water separation testing equipment in the industry requires clamping a single-layer functional filter material to conduct single-layer material filtration tests. This is limited to verifying some properties of a single-layer material and cannot demonstrate the demulsification and separation performance of a multi-layer material combination. Utility Model Content

[0004] In view of this, the present invention provides a small aggregation-induced oil-water separation test device to solve the problem that the current equipment is limited to verifying part of the performance of a single layer of filter material and cannot demonstrate the demulsification and separation performance of a multi-layer filter material combination.

[0005] This utility model provides a small-scale aggregation-induced oil-water separation testing device, comprising:

[0006] A tank, used to hold the liquid to be separated;

[0007] A demulsifying filter element is located inside the tank. The demulsifying filter element has an inner cavity and a demulsifying layer surrounding the inner cavity. The demulsifying layer is formed by winding multiple layers of demulsifying filter material and is used to demulsify oil-water emulsions that permeate from the inside to the outside of the demulsifying layer.

[0008] A separation filter element is located inside the tank. The separation filter element has an inner cavity and a separation layer surrounding the inner cavity. The separation layer is formed by winding multiple layers of oil-water separation functional filter material and is used to separate oil and water from the demulsified liquid that passes through the separation layer from the outside to the inside.

[0009] The inlet is located on the tank body and communicates with the inner cavity of the demulsifying filter element, and is used to input oil-water emulsion into the inner cavity of the demulsifying filter element;

[0010] The liquid outlet is located on the tank body and communicates with the inner cavity of the separator filter element, and is used to discharge the liquid in the inner cavity of the separator filter element.

[0011] Optionally, the demulsifying filter element is a hydrophilic demulsifying filter element, and the separating filter element is an oleophilic water-blocking filter element. The hydrophilic demulsifying filter element and the oleophilic water-blocking filter element are used together for solvent dehydration.

[0012] Optionally, the demulsifying filter element is an oleophilic demulsifying filter element, and the separating filter element is a water-passing oil-blocking filter element. The oleophilic demulsifying filter element and the water-passing oil-blocking filter element are used together for oil removal in water.

[0013] Optionally, it also includes an upper outlet located at the top of the tank and a lower outlet located at the bottom of the tank. The upper outlet is used to discharge the floating liquid and air with low density in the tank, and the lower outlet is used to discharge the sinking liquid with high density in the tank.

[0014] Optionally, it further includes a liquid supply container, an inlet pipe, a pump, an upper discharge pipe, and an outlet pipe; the liquid supply container contains the liquid to be separated, and the liquid supply container is a laboratory sample bottle or a production line pipe; one end of the inlet pipe is connected to the liquid supply container, and the other end is connected to the inlet port, and the pump is installed on the inlet pipe; one end of the outlet pipe is connected to the outlet port, one end of the upper discharge pipe is connected to the upper discharge port, and the other ends of the outlet pipe and the upper discharge pipe are both connected to the liquid supply container.

[0015] Optionally, the tank body includes an upper end plate, a cylinder, and a lower end plate arranged sequentially from top to bottom. A sealing structure is provided between the upper end plate and the top of the cylinder, and between the lower end plate and the bottom of the cylinder. The sealing structure includes a sealing gasket, and the sealing gasket is in sealing contact with the top and bottom end faces of the cylinder. A pressing structure is provided between the upper end plate and the lower end plate, which is used to press the upper end plate against the top of the cylinder and press the lower end plate against the bottom of the cylinder.

[0016] Optionally, the clamping structure includes multiple columns and a pressure cap. The columns are distributed around the cylinder and are fixedly connected to the lower end plate. The top of the column extends above the upper end plate and connects to the pressure cap, which is used to press the upper end plate downward.

[0017] Optionally, the lower end plate is provided with two hollow cylinders, which are respectively used to insert into the inner cavity of the demulsifying filter element and the inner cavity of the separating filter element. Multiple liquid outlet holes are provided at intervals along the height direction on the hollow cylinder. The bottom of the hollow cylinder is connected to the liquid inlet / liquid outlet, and the top is threaded with a filter element fixing cap. The filter element fixing cap is used to press down the top of the filter element. Both the top and bottom of the filter element are provided with end caps.

[0018] Optionally, the cylindrical body is a transparent tube.

[0019] Optionally, the inner wall of the tank and the surface of the metal parts inside the tank are provided with a hydrophobic and oleophobic surface modification layer.

[0020] The technical solution of this utility model has the following advantages:

[0021] 1. The equipment includes two types of filter elements: a demulsifying filter element and a separating filter element. The filter elements are made by a functional filter media winding process. The functional filter media is wound in multiple layers, which solves the problem that the current equipment is limited to verifying part of the performance of a single layer of filter media and cannot demonstrate the demulsifying and separating performance of the combination of multiple layers of filter media.

[0022] 2. The equipment has two sets of replaceable filter elements and two functions; one set of filter elements is a combination of a hydrophilic demulsifying filter element and an oleophilic water-blocking filter element, which is used for dehydration of various solvents; the other set of filter elements is a combination of an oleophilic demulsifying filter element and a water-passing oil-blocking filter element, which is used for oil removal in water.

[0023] 3. The internal metal parts and transparent cylinder of the equipment have been surface modified by low-temperature plasma surface treatment technology, which polymerizes fluorinated acrylate onto the surface to improve the hydrophobic and oleophobic properties of the equipment cavity, making the system less susceptible to contamination.

[0024] 4. The equipment can adopt a fully enclosed circulation mode to prevent the leakage of volatile and odorous liquids.

[0025] 5. Facilitates observation of the separation process of oil-water mixtures. In particular, the emulsion is transformed from turbid micro-droplets into larger droplets by the filter element's functional materials, which then detach from the filter element and separate, ultimately forming a layered system of oil-water separation. This greatly facilitates observation, testing, and optimization.

[0026] 6. The liquid supply container can be a laboratory sample bottle or a production line pipeline. It can not only provide laboratory-level observation and testing functions, but also directly connect the device to the material conveying pipeline of the production line for on-site online testing in the production plant. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the small-scale aggregation-induced oil-water separation test device in the embodiment.

[0029] Figure 2 This is a schematic diagram of the cyclic operation structure of the small aggregation-induced oil-water separation test device in the embodiment.

[0030] Figure 3 This is a schematic diagram of the sealing structure in the embodiment.

[0031] In the diagram: Tank 1, Upper end plate 11, Upper outlet 111, Cylinder 12, Lower end plate 13, Inlet 131, Outlet 132, Lower outlet 133, Mounting boss 134, Hollow cylinder 135, Filter element fixing cap 136, Demulsifying filter element 2, Separating filter element 3, Liquid supply container 4, Inlet pipe 5, Pump 6, Upper outlet pipe 7, Outlet pipe 8, Sealing gasket 9, Pressure gauge 10, Column 14, Pressure cap 15. Detailed Implementation

[0032] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0033] Unless otherwise explicitly specified and limited, the terms "setup," "installation," and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms based on the specific circumstances.

[0034] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0036] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0037] Please refer to Figure 1This utility model provides a small aggregation-induced oil-water separation test device, including a sealed tank 1. A demulsifying filter element 2 and a separating filter element 3 are fixed inside the tank 1. Both the demulsifying filter element 2 and the separating filter element 3 have an inner cavity, which is formed by multiple layers of functional filter material. The tank 1 has a liquid inlet 131 and a liquid outlet 132. The liquid inlet 131 communicates with the inner cavity of the demulsifying filter element 2 and is used to input the mixed liquid to be separated into the inner cavity of the demulsifying filter element 2. The liquid outlet 132 communicates with the inner cavity of the separating filter element 3 and is used to discharge the liquid in the inner cavity of the separating filter element 3.

[0038] The demulsifying filter element 2 is formed by winding multiple layers of demulsifying filter material to form a demulsifying layer and surrounding the inner cavity of the demulsifying filter element 2. The mixed liquid entering the inner cavity of the demulsifying filter element 2 from the inlet 131 is demulsified as it passes through the demulsifying layer from the inside to the outside. The tank 1 is a sealed container that holds the liquid to be separated after demulsification. The separating filter element 3 is formed by winding multiple layers of oil-water separating filter material to form a separating layer and surrounding the inner cavity of the separating filter element 3. The liquid in the tank 1 is separated into oil and water as it passes through the separating layer from the outside to the inside. After demulsification, the liquid with lower density floats on the upper layer of the tank 1, and the liquid with higher density sinks to the lower layer of the tank 1.

[0039] Furthermore, the separator filter element 3 can be used to allow water to pass through while blocking oil or vice versa, as needed. Therefore, the liquid purified by the separator filter element 3 is allowed to pass through and is discharged through the liquid outlet 132. The other phase liquid is blocked by the separator filter element 3 and floats or sinks in the tank 1 before being discharged. Specifically, in this embodiment, the demulsifying filter element 2 includes two types: a hydrophilic demulsifying filter element and an oleophilic demulsifying filter element; the separation filter element 3 includes two types: an oleophilic water-blocking filter element and a water-passing oil-blocking filter element; wherein the hydrophilic demulsifying filter element and the oleophilic water-blocking filter element are used together as a set for dehydration of various solvents. After demulsification by the hydrophilic demulsifying filter element, water droplets of the dispersed phase in the liquid will be captured by the hydrophilic skeleton of the filter element material. With the continuous impact of the liquid entering the inner cavity of the filter element, the water droplets will spontaneously aggregate and grow larger, eventually detaching from the skeleton. Depending on the solvent density, the water will sink to the bottom of the tank 1 or float to the top of the tank 1; the oleophilic demulsifying filter element and the water-passing oil-blocking filter element are used together as a set for oil removal in water. After demulsification by the oleophilic demulsifying filter element, oil droplets of the dispersed phase in the liquid will be captured by the oleophilic skeleton of the filter element material. With the continuous impact of the liquid entering the inner cavity of the filter element, the oil droplets will spontaneously aggregate and grow larger, eventually detaching from the skeleton and floating to become floating oil.

[0040] Furthermore, an upper discharge port 111 is provided at the top of the tank 1. The upper discharge port 111 is used not only to discharge the less dense floating liquid in the tank 1, but also to discharge air to prevent excessive pressure inside the tank 1. A pressure gauge 10 can also be installed on the outer wall of the tank 1, which is connected to the inside of the tank 1, to monitor the pressure inside the tank 1. A lower discharge port 133 is provided at the bottom of the tank 1 to discharge the denser sinking liquid in the tank 1. More preferably, both the upper discharge port 111 and the lower discharge port 133 are equipped with switches.

[0041] Please refer to Figure 2 Furthermore, the small aggregation-induced oil-water separation test device proposed in this embodiment can also achieve laboratory-level fully enclosed circulation filtration through the following structure: The oil-water separation test device also includes a liquid supply container 4, a liquid inlet pipe 5, a liquid outlet pipe 8, an upper discharge pipe 7, and a pump 6; the liquid supply container 4 is a laboratory sample bottle, which contains the liquid to be separated, such as an oil-water emulsion or an aqueous solvent; one end of the liquid inlet pipe 5 is connected to the liquid supply container 4, and the other end is connected to the liquid inlet 131 of the tank 1; the pump 6 is installed on the liquid inlet pipe 5, and the liquid in the liquid supply container 4 is continuously input into the inner cavity of the demulsifying filter element 2 by the pump 6; one end of the liquid outlet pipe 8 is connected to the liquid outlet 132 of the tank 1, and the other end is connected to the liquid supply container 4; one end of the upper discharge pipe 7 is connected to the upper discharge outlet 111 of the tank 1, and the other end is connected to the pipe wall of the liquid outlet pipe 8 or directly connected to the liquid supply container 4.

[0042] Taking the oil-water separation test device's water removal function circulation process as an example: the oil-water emulsion in the supply container 4 flows through the inlet pipe 5, and through the pump 6, enters the inner cavity of the oleophilic demulsifying filter element from the inlet port 131. The oleophilic demulsifying filter element allows both oil and water to pass through it. The oil droplets in the dispersed phase are captured by the oleophilic skeleton of the demulsifying filter element 2. With the continuous impact of the incoming liquid, the oil droplets spontaneously aggregate and grow larger, eventually detaching from the skeleton and floating to become floating oil. The upper discharge port 111 is opened, and the recovered oil is discharged to the supply container 4 through the upper discharge pipe 7 to achieve oil-water mixing. Meanwhile, the water-passing oil-blocking filter element allows water to pass through, while the oil is blocked outside the filter element. The outlet port 132 is opened, and the separated water that has entered the inner cavity of the filter element is discharged to the supply container 4 through the outlet pipe 8, thus achieving continuous operation of the equipment.

[0043] When performing solvent dehydration, the lower drain port 133 needs to be directly connected to the supply container 4 with a pipe, or indirectly connected to the supply container 4 by connecting the outlet pipe 8. Taking the solvent dehydration function cycle of this oil-water separation test device as an example: the aqueous solvent in the supply container 4 flows through the inlet pipe 5, and enters the inner cavity of the hydrophilic demulsifying filter element through the inlet port 131 via the pump 6. Both oil and water can pass through the hydrophilic demulsifying filter element. The water droplets of the dispersed phase are captured by the hydrophilic skeleton of the hydrophilic demulsifying filter element. With the continuous impact of the incoming liquid, the water droplets spontaneously aggregate and grow larger, eventually detaching from the skeleton. The oleophilic water-blocking filter element allows the solvent to pass through, while the water is blocked outside the filter element. Solvents with a density less than water flow back to the supply container 4 from the upper drain port 111, and solvents with a density greater than water flow back to the supply container 4 from the lower drain port 133. The recovered water and solvent are mixed in the supply container 4 and continue to circulate, thereby realizing the continuous operation of the equipment.

[0044] Furthermore, the liquid supply container 4 can also be a production line pipeline, allowing the oil-water separation test device of this embodiment to be directly connected to the material conveying pipeline of the production line for on-site online testing at the production plant.

[0045] Please refer to Figure 1 and Figure 3 Furthermore, the tank 1 can also be detachable for installing and replacing the filter element, and for sealing the tank 1, through the following structure: the tank 1 includes an upper end plate 11, a cylinder 12, and a lower end plate 13 distributed from top to bottom. Sealing structures are provided between the top end plate 11 and the top of the cylinder 12, and between the lower end plate 13 and the bottom of the cylinder 12. The sealing structures include two sealing gaskets 9. One sealing gasket 9 is in sealing contact with the top end face of the cylinder 12, and the other sealing gasket 9 is in sealing contact with the bottom end face of the cylinder 12. More preferably, annular grooves are provided on the lower surface of the upper end plate 11 and the upper surface of the lower end plate 13 to accommodate the sealing gaskets 9. The end of the cylinder 12 is also inserted into the annular groove to press the sealing gaskets 9. The upper end plate 11 and the lower end plate 13... A clamping structure is also provided between the upper end plate 11 and the lower end plate 13. The clamping structure causes the upper end plate 11 to clamp the top of the cylinder 12 and the lower end plate 13 to clamp the bottom of the cylinder 12. Specifically, the clamping structure includes multiple columns 14, each column 14 having a pressure cap 15 connected to its top. The columns 14 are distributed around the cylinder 12 and are fixedly connected to the lower end plate 13. The upper end plate 11 has a through hole, through which the top of the column 14 extends to the top of the upper end plate 11 and connects to the pressure cap 15. The pressure cap 15 is threaded to the top of the column 14, or the pressure cap 15 is a quick clamp. The function of the pressure cap 15 is to press the upper end plate 11 downward, so that the top of the cylinder 12 is clamped and sealed by the upper end plate 11 and the sealing gasket 9, and the bottom is clamped and sealed by the lower end plate 13 and the sealing gasket 9. The lower surface of the lower end plate 13 can be provided with support feet to elevate the equipment, or the columns 14 can be extended under the lower end plate 13 as support feet.

[0046] Please refer to Figure 1 Furthermore, the upper surface of the lower end plate 13 has two mounting bosses 134. A vertical hollow column 135 is provided on the top of the mounting bosses 134. The mounting bosses 134 are used to install the filter element. After installation, the bottom of the filter element is pressed against the top of the mounting bosses 134. The hollow column 135 is coaxially inserted into the inner cavity of the filter element. There is an annular gap between the hollow column 135 and the inner wall of the inner cavity. Multiple liquid outlet holes are provided at intervals along the height direction on the hollow column 135. The bottom of the hollow column 135 is connected to the liquid inlet 131 or the liquid outlet 132. The top is threaded with a filter element fixing cap 136. The filter element is installed between the filter element fixing cap 136 and the mounting bosses 134. After the filter element fixing cap 136 is tightened, it is used to press down the top of the filter element. Both the top and bottom of the filter element are fixed with end caps. Specifically, in this embodiment, the end caps at both ends of the filter element are connected to the functional filter material of the filter element by heat welding and adhesive bonding to ensure that the top and bottom of the filter element cavity are leak-proof.

[0047] Furthermore, the cylinder 12 is made of a transparent tube to facilitate observation of the separation process of the oil-water mixture. The transparent tube can be a glass tube, an acrylic tube, etc., and in this embodiment, an acrylic tube is preferred.

[0048] Furthermore, the inner wall of tank 1 and the surface of the metal parts inside tank 1 are provided with a hydrophobic and oleophobic surface modification layer. Specifically, in this embodiment, the inner wall of tank 1 and the metal parts inside tank 1 have been surface modified by low-temperature plasma surface treatment technology, polymerizing fluorinated acrylate onto the surface to improve the hydrophobic and oleophobic properties of the equipment cavity, making the system less susceptible to contamination.

[0049] In summary, the technical solution of this utility model has the following advantages:

[0050] The equipment includes two types of filter elements: a demulsifying filter element and a separating filter element. The filter elements are made by a functional filter media winding process. The functional filter media is wound in multiple layers, which solves the problem that the current equipment is limited to verifying part of the performance of a single layer of filter media and cannot demonstrate the demulsifying and separating performance of a combination of multiple layers of filter media.

[0051] The equipment has two sets of replaceable filter elements and two functions; one set of filter elements is a combination of a hydrophilic demulsifying filter element and an oleophilic water-blocking filter element, which is used for dehydration of various solvents; the other set of filter elements is a combination of an oleophilic demulsifying filter element and a water-passing oil-blocking filter element, which is used for oil removal in water.

[0052] The internal metal parts and transparent cylinder of the equipment have been surface modified by low-temperature plasma surface treatment technology, which polymerizes fluorinated acrylate onto the surface to improve the hydrophobic and oleophobic properties of the equipment cavity, making the system less susceptible to contamination.

[0053] The device can adopt a fully enclosed circulation mode to prevent the leakage of volatile and odorous liquids.

[0054] It facilitates the observation of the separation process of oil-water mixtures. In particular, the emulsion changes from tiny droplets in a turbid state to large droplets adsorbed and aggregated by the filter element's functional materials, and the large droplets detach from the filter element to separate, ultimately forming a layered system of oil-water separation, which greatly facilitates observation, detection, and optimization.

[0055] The liquid supply container can be a laboratory sample bottle or a production line pipeline. It can not only provide laboratory-level observation and testing functions, but also connect the device directly to the material conveying pipeline of the production line for on-site online testing in the production plant.

[0056] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A small-scale aggregation-induced oil-water separation testing device, characterized in that, include: A tank, used to hold the liquid to be separated; A demulsifying filter element is located inside the tank. The demulsifying filter element has an inner cavity and a demulsifying layer surrounding the inner cavity. The demulsifying layer is formed by winding multiple layers of demulsifying filter material and is used to demulsify oil-water emulsions that permeate from the inside to the outside of the demulsifying layer. A separation filter element is located inside the tank. The separation filter element has an inner cavity and a separation layer surrounding the inner cavity. The separation layer is formed by winding multiple layers of oil-water separation functional filter material and is used to separate oil and water from the demulsified liquid that passes through the separation layer from the outside to the inside. The inlet is located on the tank body and communicates with the inner cavity of the demulsifying filter element, and is used to input oil-water emulsion into the inner cavity of the demulsifying filter element; The liquid outlet is located on the tank body and communicates with the inner cavity of the separator filter element, and is used to discharge the liquid in the inner cavity of the separator filter element.

2. The small-scale aggregation-induced oil-water separation testing device according to claim 1, characterized in that, The demulsifying filter element is a hydrophilic demulsifying filter element, and the separating filter element is an oleophilic water-blocking filter element. The hydrophilic demulsifying filter element and the oleophilic water-blocking filter element are used together for solvent dehydration.

3. The small-scale aggregation-induced oil-water separation testing device according to claim 1, characterized in that, The demulsifying filter element is an oleophilic demulsifying filter element, and the separating filter element is a water-passing oil-blocking filter element. The oleophilic demulsifying filter element and the water-passing oil-blocking filter element are used together for oil removal in water.

4. The small-scale aggregation-induced oil-water separation testing device according to claim 2 or 3, characterized in that, It also includes an upper outlet located at the top of the tank and a lower outlet located at the bottom of the tank. The upper outlet is used to discharge the floating liquid and air with low density in the tank, and the lower outlet is used to discharge the sinking liquid with high density in the tank.

5. The small-scale aggregation-induced oil-water separation testing device according to claim 4, characterized in that, It also includes a liquid supply container, a liquid inlet pipe, a pump, an upper discharge pipe, and a liquid outlet pipe; the liquid supply container contains the liquid to be separated, and the liquid supply container is a laboratory sample bottle or a production line pipe; one end of the liquid inlet pipe is connected to the liquid supply container, and the other end is connected to the liquid inlet, and the pump is installed on the liquid inlet pipe; one end of the liquid outlet pipe is connected to the liquid outlet, one end of the upper discharge pipe is connected to the upper discharge outlet, and the other end of the liquid outlet pipe and the other end of the upper discharge pipe both lead to the liquid supply container.

6. The small-scale aggregation-induced oil-water separation testing device according to any one of claims 1-5, characterized in that, The tank body includes an upper end plate, a cylinder, and a lower end plate arranged sequentially from top to bottom. A sealing structure is provided between the upper end plate and the top of the cylinder, and between the lower end plate and the bottom of the cylinder. The sealing structure includes a sealing gasket, and the sealing gasket is in sealing contact with the top and bottom end faces of the cylinder. A pressing structure is provided between the upper end plate and the lower end plate, which is used to press the upper end plate against the top of the cylinder and press the lower end plate against the bottom of the cylinder.

7. The small-scale aggregation-induced oil-water separation testing device according to claim 6, characterized in that, The clamping structure includes multiple columns and a pressure cap. The columns are distributed around the cylinder and are fixedly connected to the lower end plate. The top of the column extends above the upper end plate and connects to the pressure cap, which is used to press the upper end plate downward.

8. The small-scale aggregation-induced oil-water separation testing device according to claim 6, characterized in that, The lower end plate is provided with two hollow cylinders, which are respectively used to insert into the inner cavity of the demulsifying filter element and the inner cavity of the separating filter element. Multiple liquid outlet holes are provided at intervals along the height direction on the hollow cylinder. The bottom of the hollow cylinder is connected to the liquid inlet / liquid outlet, and the top is threaded with a filter element fixing cap. The filter element fixing cap is used to press down the top of the filter element. Both the top and bottom of the filter element are provided with end caps.

9. The small-scale aggregation-induced oil-water separation testing device according to claim 6, characterized in that, The cylindrical body is a transparent tube.

10. The small-scale aggregation-induced oil-water separation testing device according to claim 6, characterized in that, The inner wall of the tank and the surface of the metal parts inside the tank are all provided with a hydrophobic and oleophobic surface modification layer.

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