An environmentally friendly automatic slag discharge oil-water separator

Abstract

This invention relates to an environmentally friendly automatic slag-discharging oil-water separator, comprising an oil-water separator body, an oil discharge tank, and a purified water tank. The oil discharge tank is connected to the side wall of the oil-water separator body via an oil discharge pipe, and the purified water tank is connected to the bottom of the oil-water separator body via a drain pipe. The top of the oil-water separator body has a feed inlet, and the interior of the oil-water separator body contains a first filter plate, a second filter plate, and a third filter plate. The bottom of the purified water tank has a drain outlet, and the inner wall of the purified water tank contains a fourth filter plate. The fourth filter plate is an inverted cone shape, tapering from bottom to top, and includes a porous filter plate and an oil-water separation membrane attached to the porous filter plate. To achieve more thorough oil-water separation, this invention incorporates a fourth filter plate made of modified polysulfone membrane, which significantly increases the degree of oil-water separation.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation devices, and more specifically to an environmentally friendly automatic slag-discharging oil-water separator. Background Technology

[0002] With increasing environmental awareness, people are paying more and more attention to environmental protection and the rational recycling of resources. Besides common industries like manufacturing, agriculture, and transportation, the catering industry also generates a large amount of wastewater. This wastewater contains grease, water, and food scraps. If discharged directly, the grease and scraps are difficult to treat. Therefore, devices that can separate grease from water have gradually appeared on the market. These devices utilize the different densities of oil and water to separate them. However, the separated water often still contains a large amount of grease, making the oil-water separation effect less than expected. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides an environmentally friendly automatic slag discharge oil-water separator. Its integrated design can separate oil, water and slag at the same time, which not only improves the separation efficiency of oil, water and slag, but also has a better separation effect on oil and water.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] An environmentally friendly automatic slag-discharging oil-water separator includes an oil-water separator body, an oil discharge tank, and a purified water tank. The oil discharge tank is connected to the side wall of the oil-water separator body via an oil discharge pipe, and the purified water tank is connected to the bottom of the oil-water separator body via a drainage pipe. An inlet is located at the top of the oil-water separator body. The interior of the oil-water separator body contains a first filter plate, a second filter plate, and a third filter plate. One end of the first filter plate is fixed to the left side of the inner wall of the oil-water separator body, while the other end is suspended. One end of the second filter plate is fixed to the right side of the inner wall of the oil-water separator body, and the other end is suspended. One end is suspended in the air; the third filter plate is set below the first and second filter plates, and both ends of the third filter plate are fixed to the inner wall of the oil-water separator body; an oil pump is set on the oil discharge pipe, and a suction nozzle is set at the end of the oil discharge pipe that connects to the oil-water separator body. Multiple suspended balls are fixed on the suction nozzle, and the suction nozzle is located below the third filter plate; a drain outlet is set at the bottom of the water tank, and a fourth filter plate is set on the inner wall of the water tank. The fourth filter plate is an inverted cone shape with a pointed bottom and a wider top. The fourth filter plate includes a porous filter plate and an oil-water separation membrane attached to the porous filter plate.

[0006] Preferably, a slag discharge port is provided on one side of the oil-water separator body, and a movable baffle is hinged above the slag discharge port; the slag discharge port is located above the third filter plate.

[0007] Preferably, the first filter plate is inclined with the left side higher than the right side, and the second filter plate is inclined with the right side higher than the left side; there are multiple first filter plates and multiple second filter plates, and each first filter plate and each second filter plate are spaced apart from each other.

[0008] Preferably, a vibrator is fixed to the lower surface of both the first filter plate and the second filter plate.

[0009] Preferably, the first and second filter plates are made of the same material and have the same pore size, and the third filter plate has a smaller pore size than the first and second filter plates.

[0010] Preferably, the fourth filter plate is capable of sliding up and down along the inner wall of the water purification tank.

[0011] Preferably, the porous filter plate is made of organic polymer material, and the pore size of the porous filter plate is 0.1 to 0.5 mm.

[0012] Preferably, the oil-water separation membrane is a modified polysulfone membrane, which is obtained by loading an organic bismuth-germanium framework material onto the polysulfone membrane, and the surface pore size of the polysulfone membrane is 50-80 μm.

[0013] Preferably, the method for preparing the organic bismuth-germanium framework material is as follows:

[0014] Step 1: Weigh out bismuth potassium citrate and carboxyethyl germanium sesquioxide, mix them, and add them to an ultrafine mixing and grinding mill. Grind for 1-2 hours to obtain a mixed powder. The molar ratio of bismuth potassium citrate to carboxyethyl germanium sesquioxide is 1.8-2.2:1.

[0015] Step 2: Weigh 1,3,5-pyromellitic acid and add it to the organic solvent. Stir until homogeneous, then add the mixed powder and stir again until homogeneous. Pour the mixture into a reaction vessel lined with polytetrafluoroethylene (PTFE). Heat the mixture to 180–200°C and maintain the temperature for 24–36 hours. After naturally cooling to room temperature, collect the solid product by filtration. Wash the solid product sequentially with DMF and deionized water, and then dry it in an oven at 80–100°C to obtain the organic bismuth-germanium framework material. The mass ratio of 1,3,5-pyromellitic acid, mixed powder, and organic solvent is 1:2.4–3.6:8–10.

[0016] Step 3: Weigh diethylamine phosphate and mix with deionized water, stir thoroughly until dissolved, add organic bismuth-germanium framework material, heat to 60-80℃, stir for 2-5 hours, then filter and dry the filter residue in an oven at 80-100℃ to obtain activated organic bismuth-germanium framework material; wherein, the mass ratio of diethylamine phosphate, organic bismuth-germanium framework material and deionized water is 0.1-0.3:1:10-15;

[0017] Step 4: Mix the activated organic bismuth-germanium framework material with deionized water, then add bismuth selenide nanomaterials. After ultrasonic homogenization, introduce the mixture into a reaction vessel and treat it at 120–150℃ for 5–8 hours. After cooling to room temperature, filter and collect the filter residue. Wash the filter residue sequentially with DMF and deionized water, and then dry it in an oven at 80–100℃ to obtain the organic bismuth-germanium framework material. The mass ratio of the activated organic bismuth-germanium framework material, bismuth selenide nanomaterials and deionized water is 1:0.2–0.5:6–10.

[0018] Preferably, the mixed solvent in step 2 is obtained by mixing methanol and DMF in a volume ratio of 2 to 3:1.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. When wastewater from the catering industry enters through the inlet, it undergoes multi-layer filtration and screening through a first and second filter plate arranged at intervals from top to bottom. When residue falls onto the filter plate, a vibrator is activated, causing the connected first and second filter plates to vibrate, promoting the downward rolling of the residue. Simultaneously, the liquid components in the residue fall directly along the pores of the filter plate to the third filter plate. The third filter plate has smaller pores; after being processed by the first and second filter plates, all solid residue in the wastewater accumulates on the third filter plate and is then discharged through the slag discharge port.

[0021] 2. This invention includes an oil discharge tank for holding grease waste discharged from wastewater. After the wastewater undergoes slag removal treatment via a triple filter plate, solid residues are separated. The wastewater containing the separated solid residues then undergoes oil-water separation at the bottom of the separation tank. The less dense grease floats on the surface, and the suspended balls on the suction nozzle also keep it afloat, facilitating the suction nozzle to draw in the grease. The oil pump is then activated, and the grease is transferred from the suction nozzle through the discharge pipe to the oil discharge tank. This separation process is convenient and efficient.

[0022] 3. To maximize the separation of grease from wastewater, this invention also includes a purification tank for further separation of the water after the initial oil-water separation. After the initial oil suction in the automatic slag discharge oil-water separator, most of the grease is collected in the oil discharge tank through the oil discharge pipe, while the separated water enters the purification tank through the drainage pipe. However, some grease still remains in the separated water. Therefore, this invention also includes a fourth filter plate in the purification tank. This fourth filter plate can further adsorb the grease from the water, thus achieving near-complete oil-water separation. The purification tank of this invention is completely sealed and can perform oil-water separation under normal or pressurized conditions. Furthermore, the fourth filter plate can move up and down along the inner wall of the purification tank, facilitating the adsorption and filtration of grease from both the upper and lower layers of water.

[0023] 4. The present invention sets a fourth filter plate in the water purification tank. The fourth filter plate is made of modified polysulfone membrane and porous filter plate. Polysulfone membrane itself is a hydrophobic and oleophilic material, but its oil-water separation effect is insufficient. Therefore, the present invention uses an organic bismuth germanium framework material loaded on the surface of polysulfone membrane to prepare a modified polysulfone membrane. The modified polysulfone membrane can greatly increase the degree of oil-water separation. Attached Figure Description

[0024] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an environmentally friendly automatic slag discharge oil-water separator according to the present invention.

[0026] Attached reference numerals: 1. Oil-water separator body; 2. Oil drain tank; 3. Clean water tank; 4. Oil drain pipe; 5. Drain pipe; 6. Feed inlet; 7. First filter plate; 8. Second filter plate; 9. Third filter plate; 10. Oil pump; 11. Suction nozzle; 12. Suspended ball; 13. Drain outlet; 14. Fourth filter plate; 15. Slag discharge outlet; 16. Movable baffle; and 17. Vibrator. Detailed Implementation

[0027] To more clearly illustrate the present invention and to gain a clearer understanding of its technical features, objectives, and beneficial effects, the technical solution of the present invention will now be described in detail below, but this should not be construed as limiting the scope of the present invention.

[0028] Metal-organic frameworks (MOFs) possess large specific surface areas and high porosity. The pore size of these materials is directly influenced by the length of the organic functional groups; the longer the organic ligand, the larger the pore size after removing the guest molecule. Different organic ligands and metal ions result in significantly different material properties, primarily due to variations in pore size, adsorption, and separation performance. For adsorption and separation, MOFs with relatively small pore sizes and high porosity are generally selected.

[0029] Among existing organic ligands, metal-organic frameworks formed by coordination between 1,3,5-pyromellitic acid and metals have been extensively studied. These frameworks maintain a permanent pore structure even after the adsorption and desorption of guest molecules and exhibit good thermal stability, making them one of the most classic MOFs. However, metal-organic frameworks formed with 1,3,5-pyromellitic acid as a ligand are sensitive to water vapor. Under atmospheric conditions, the coordination bonds within the crystal break, causing the crystal structure to collapse and resulting in the loss of the permanent pore structure and high specific surface area. However, a large amount of water vapor is inevitably formed during the oil-water separation process, which directly leads to the limited lifespan of the framework material. Therefore, to solve this problem, this invention first uses organic bismuth (bismuth potassium citrate) containing multiple carboxyl groups and organic germanium (carboxyethyl germanium sesquioxide) with a multiple carboxyl ring structure as coordination metals, and 1,3,5-pyromellitic acid as a ligand to prepare an organic bismuth-germanium framework material. Then, germanium selenide is used to load this framework material, resulting in a final metal framework material with advantages such as small pore size, high porosity, and resistance to collapse in the presence of water vapor. Furthermore, the addition of organic bismuth and organic germanium significantly increases the number of organic groups, thereby enhancing the adsorption capacity for oils and fats.

[0030] The repeating structure of carboxyethyl germanium sesquioxide consists of a twelve-membered ring composed of six germanium atoms and six oxygen atoms. Each germanium atom is also connected to three oxygen atoms, forming arbitrarily extendable sheets. Each germanium atom is connected to a carboxyethyl group, and the sheets interact with each other to form a three-dimensional network structure. During the reaction, it can be embedded in the crystal material. At the same time, the carboxylic acid groups in the ligand 1,3,5-pyromellitic acid replace the carboxylic acid groups in carboxyethyl germanium sesquioxide through ion exchange reactions, thereby changing the original structural characteristics of the grown crystal and greatly reducing its sensitivity to water vapor. In addition, the three-dimensional cubic structure formed by organobismuth and 1,3,5-pyromellitic acid is interspersed with the three-dimensional network structure formed by organobismuth and the two-dimensional layered structure formed by germanium selenide. This double protection makes the coordination bonds inside the crystal more stable and less prone to breakage, ensuring the integrity of the channel structure and avoiding defects that cause crystal structure collapse.

[0031] The present invention will be further described in conjunction with the following embodiments.

[0032] Example 1

[0033] An environmentally friendly automatic slag and oil-water separator, such as Figure 1As shown, the system includes an oil-water separator body 1, an oil discharge tank 2, and a purified water tank 3. The oil discharge tank 2 is connected to the side wall of the oil-water separator body 1 via an oil discharge pipe 4, and the purified water tank 3 is connected to the bottom of the oil-water separator body 1 via a drain pipe 5. An inlet 6 is provided at the top of the oil-water separator body 1. A first filter plate 7, a second filter plate 8, and a third filter plate 9 are provided inside the oil-water separator body 1. One end of the first filter plate 7 is fixed to the left side of the inner wall of the oil-water separator body 1, and the other end is suspended. One end of the second filter plate 8 is fixed to the right side of the inner wall of the oil-water separator body 1, and the other end is suspended. The third filter plate 9 is... The third filter plate 9 is placed below the first filter plate 7 and the second filter plate 8, and both ends of the third filter plate 9 are fixed to the inner wall of the oil-water separator body 1; an oil pump 10 is provided on the oil drain pipe 4, and a suction nozzle 11 is provided at one end of the oil drain pipe 4 that is connected to the oil-water separator body 1. Multiple suspended balls 12 are fixed on the suction nozzle 11, and the suction nozzle 11 is located below the third filter plate 9; a drain outlet 13 is provided at the bottom of the water tank 3, and a fourth filter plate 14 is provided on the inner wall of the water tank 3. The fourth filter plate 14 is an inverted cone shape that is pointed at the bottom and wide at the top. The fourth filter plate 14 includes a porous filter plate and an oil-water separation membrane attached to the porous filter plate.

[0034] The oil-water separator body 1 has a slag discharge port 15 on one side, and a movable baffle 16 is hinged above the slag discharge port 15; the slag discharge port 15 is located above the third filter plate 9.

[0035] The first filter plate 7 is tilted with the left side higher than the right side, and the second filter plate 8 is tilted with the right side higher than the left side; there are multiple first filter plates 7 and multiple second filter plates 8, and each first filter plate 7 and each second filter plate 8 are spaced apart from each other.

[0036] Vibrators 17 are fixed to the lower surfaces of both the first filter plate 7 and the second filter plate 8.

[0037] The first filter plate 7 and the second filter plate 8 are made of the same material and have the same pore size, while the third filter plate 9 has a smaller pore size than the first filter plate 7 and the second filter plate 8.

[0038] The fourth filter plate 14 can slide up and down along the inner wall of the water purification tank 3.

[0039] The porous filter plate is made of organic polymer material, and the pore size of the porous filter plate is 0.1 to 0.5 mm.

[0040] The oil-water separation membrane is a modified polysulfone membrane, which is obtained by loading an organic bismuth-germanium framework material onto the polysulfone membrane. The surface pore size of the polysulfone membrane is 50-80 μm.

[0041] The preparation method of the organic bismuth-germanium framework material is as follows:

[0042] Step 1: Weigh out bismuth potassium citrate and carboxyethyl germanium sesquioxide, mix them, and add them to an ultrafine mixing mill. Grind for 1-2 hours to obtain a mixed powder. The molar ratio of bismuth potassium citrate to carboxyethyl germanium sesquioxide is 2:1.

[0043] Step 2: Weigh 1,3,5-pyromellitic acid and add it to the organic solvent. Stir until homogeneous, then add the mixed powder and stir again until homogeneous. Pour the mixture into a reaction vessel lined with polytetrafluoroethylene (PTFE). Heat the mixture to 180–200°C and maintain the temperature for 24–36 hours. After naturally cooling to room temperature, filter and collect the solid product. Wash the solid product sequentially with DMF and deionized water, and then dry it in an oven at 80–100°C to obtain the organobismuth-germanium framework material. The mass ratio of 1,3,5-pyromellitic acid, mixed powder, and organic solvent is 1:3:9.

[0044] Step 3: Weigh diethylamine phosphate and mix with deionized water, stir thoroughly until dissolved, add organic bismuth-germanium framework material, heat to 60-80℃, stir for 2-5 hours, then filter and dry the filter residue in an oven at 80-100℃ to obtain activated organic bismuth-germanium framework material; wherein, the mass ratio of diethylamine phosphate, organic bismuth-germanium framework material and deionized water is 0.2:1:12;

[0045] Step 4: Mix the activated organic bismuth-germanium framework material with deionized water, then add bismuth selenide nanomaterials. After ultrasonic homogenization, introduce the mixture into a reaction vessel and treat it at 120-150℃ for 5-8 hours. After cooling to room temperature, filter and collect the filter residue. Wash the filter residue sequentially with DMF and deionized water, and then dry it in an oven at 80-100℃ to obtain the organic bismuth-germanium framework material. The mass ratio of the activated organic bismuth-germanium framework material, bismuth selenide nanomaterials and deionized water is 1:0.3:8.

[0046] The mixed solvent in step 2 is obtained by mixing methanol and DMF in a volume ratio of 2.5:1.

[0047] Example 2

[0048] An environmentally friendly automatic slag and oil-water separator, such as Figure 1As shown, the system includes an oil-water separator body 1, an oil discharge tank 2, and a purified water tank 3. The oil discharge tank 2 is connected to the side wall of the oil-water separator body 1 via an oil discharge pipe 4, and the purified water tank 3 is connected to the bottom of the oil-water separator body 1 via a drain pipe 5. An inlet 6 is provided at the top of the oil-water separator body 1. A first filter plate 7, a second filter plate 8, and a third filter plate 9 are provided inside the oil-water separator body 1. One end of the first filter plate 7 is fixed to the left side of the inner wall of the oil-water separator body 1, and the other end is suspended. One end of the second filter plate 8 is fixed to the right side of the inner wall of the oil-water separator body 1, and the other end is suspended. The third filter plate 9 is... The third filter plate 9 is placed below the first filter plate 7 and the second filter plate 8, and both ends of the third filter plate 9 are fixed to the inner wall of the oil-water separator body 1; an oil pump 10 is provided on the oil drain pipe 4, and a suction nozzle 11 is provided at one end of the oil drain pipe 4 that is connected to the oil-water separator body 1. Multiple suspended balls 12 are fixed on the suction nozzle 11, and the suction nozzle 11 is located below the third filter plate 9; a drain outlet 13 is provided at the bottom of the water tank 3, and a fourth filter plate 14 is provided on the inner wall of the water tank 3. The fourth filter plate 14 is an inverted cone shape that is pointed at the bottom and wide at the top. The fourth filter plate 14 includes a porous filter plate and an oil-water separation membrane attached to the porous filter plate.

[0049] The oil-water separator body 1 has a slag discharge port 15 on one side, and a movable baffle 16 is hinged above the slag discharge port 15; the slag discharge port 15 is located above the third filter plate 9.

[0050] The first filter plate 7 is tilted with the left side higher than the right side, and the second filter plate 8 is tilted with the right side higher than the left side; there are multiple first filter plates 7 and multiple second filter plates 8, and each first filter plate 7 and each second filter plate 8 are spaced apart from each other.

[0051] Vibrators 17 are fixed to the lower surfaces of both the first filter plate 7 and the second filter plate 8.

[0052] The first filter plate 7 and the second filter plate 8 are made of the same material and have the same pore size, while the third filter plate 9 has a smaller pore size than the first filter plate 7 and the second filter plate 8.

[0053] The fourth filter plate 14 can slide up and down along the inner wall of the water purification tank 3.

[0054] The porous filter plate is made of organic polymer material, and the pore size of the porous filter plate is 0.1 to 0.5 mm.

[0055] The oil-water separation membrane is a modified polysulfone membrane, which is obtained by loading an organic bismuth-germanium framework material onto the polysulfone membrane. The surface pore size of the polysulfone membrane is 50-80 μm.

[0056] The preparation method of the organic bismuth-germanium framework material is as follows:

[0057] Step 1: Weigh out bismuth potassium citrate and carboxyethyl germanium sesquioxide, mix them, and add them to an ultrafine mixing and grinding mill. Grind for 1-2 hours to obtain a mixed powder. The molar ratio of bismuth potassium citrate to carboxyethyl germanium sesquioxide is 1.8:1.

[0058] Step 2: Weigh 1,3,5-pyromellitic acid and add it to the organic solvent. Stir until homogeneous, then add the mixed powder and stir again until homogeneous. Pour the mixture into a reaction vessel lined with polytetrafluoroethylene (PTFE). Heat the mixture to 180–200°C and maintain the temperature for 24–36 hours. After naturally cooling to room temperature, collect the solid product by filtration. Wash the solid product sequentially with DMF and deionized water, and then dry it in an oven at 80–100°C to obtain the organic bismuth-germanium framework material. The mass ratio of 1,3,5-pyromellitic acid, mixed powder, and organic solvent is 1:2.4:8.

[0059] Step 3: Weigh diethylamine phosphate and mix with deionized water, stir thoroughly until dissolved, add organic bismuth-germanium framework material, heat to 60-80℃, stir for 2-5 hours, then filter and dry the filter residue in an oven at 80-100℃ to obtain activated organic bismuth-germanium framework material; wherein, the mass ratio of diethylamine phosphate, organic bismuth-germanium framework material and deionized water is 0.1:1:10;

[0060] Step 4: Mix the activated organic bismuth-germanium framework material with deionized water, then add bismuth selenide nanomaterials. After ultrasonic homogenization, introduce the mixture into a reaction vessel and treat it at 120-150℃ for 5-8 hours. After cooling to room temperature, filter and collect the filter residue. Wash the filter residue sequentially with DMF and deionized water, and then dry it in an oven at 80-100℃ to obtain the organic bismuth-germanium framework material. The mass ratio of the activated organic bismuth-germanium framework material, bismuth selenide nanomaterials and deionized water is 1:0.2:6.

[0061] The mixed solvent in step 2 is obtained by mixing methanol and DMF in a volume ratio of 2:1.

[0062] Example 3

[0063] An environmentally friendly automatic slag and oil-water separator, such as Figure 1As shown, the system includes an oil-water separator body 1, an oil discharge tank 2, and a purified water tank 3. The oil discharge tank 2 is connected to the side wall of the oil-water separator body 1 via an oil discharge pipe 4, and the purified water tank 3 is connected to the bottom of the oil-water separator body 1 via a drain pipe 5. An inlet 6 is provided at the top of the oil-water separator body 1. A first filter plate 7, a second filter plate 8, and a third filter plate 9 are provided inside the oil-water separator body 1. One end of the first filter plate 7 is fixed to the left side of the inner wall of the oil-water separator body 1, and the other end is suspended. One end of the second filter plate 8 is fixed to the right side of the inner wall of the oil-water separator body 1, and the other end is suspended. The third filter plate 9 is... The third filter plate 9 is placed below the first filter plate 7 and the second filter plate 8, and both ends of the third filter plate 9 are fixed to the inner wall of the oil-water separator body 1; an oil pump 10 is provided on the oil drain pipe 4, and a suction nozzle 11 is provided at one end of the oil drain pipe 4 that is connected to the oil-water separator body 1. Multiple suspended balls 12 are fixed on the suction nozzle 11, and the suction nozzle 11 is located below the third filter plate 9; a drain outlet 13 is provided at the bottom of the water tank 3, and a fourth filter plate 14 is provided on the inner wall of the water tank 3. The fourth filter plate 14 is an inverted cone shape that is pointed at the bottom and wide at the top. The fourth filter plate 14 includes a porous filter plate and an oil-water separation membrane attached to the porous filter plate.

[0064] The oil-water separator body 1 has a slag discharge port 15 on one side, and a movable baffle 16 is hinged above the slag discharge port 15; the slag discharge port 15 is located above the third filter plate 9.

[0065] The first filter plate 7 is tilted with the left side higher than the right side, and the second filter plate 8 is tilted with the right side higher than the left side; there are multiple first filter plates 7 and multiple second filter plates 8, and each first filter plate 7 and each second filter plate 8 are spaced apart from each other.

[0066] Vibrators 17 are fixed to the lower surfaces of both the first filter plate 7 and the second filter plate 8.

[0067] The first filter plate 7 and the second filter plate 8 are made of the same material and have the same pore size, while the third filter plate 9 has a smaller pore size than the first filter plate 7 and the second filter plate 8.

[0068] The fourth filter plate 14 can slide up and down along the inner wall of the water purification tank 3.

[0069] The porous filter plate is made of organic polymer material, and the pore size of the porous filter plate is 0.1 to 0.5 mm.

[0070] The oil-water separation membrane is a modified polysulfone membrane, which is obtained by loading an organic bismuth-germanium framework material onto the polysulfone membrane. The surface pore size of the polysulfone membrane is 50-80 μm.

[0071] The preparation method of the organic bismuth-germanium framework material is as follows:

[0072] Step 1: Weigh out bismuth potassium citrate and carboxyethyl germanium sesquioxide, mix them, and add them to an ultrafine mixing and grinding mill. Grind for 1-2 hours to obtain a mixed powder. The molar ratio of bismuth potassium citrate to carboxyethyl germanium sesquioxide is 2.2:1.

[0073] Step 2: Weigh 1,3,5-pyromellitic acid and add it to the organic solvent. Stir until homogeneous, then add the mixed powder and stir again until homogeneous. Pour the mixture into a reaction vessel lined with polytetrafluoroethylene (PTFE). Heat the mixture to 180–200°C and maintain the temperature for 24–36 hours. After naturally cooling to room temperature, collect the solid product by filtration. Wash the solid product sequentially with DMF and deionized water, and then dry it in an oven at 80–100°C to obtain the organic bismuth-germanium framework material. The mass ratio of 1,3,5-pyromellitic acid, mixed powder, and organic solvent is 1:3.6:10.

[0074] Step 3: Weigh diethylamine phosphate and mix with deionized water, stir thoroughly until dissolved, add organic bismuth-germanium framework material, heat to 60-80℃, stir for 2-5 hours, then filter and dry the filter residue in an oven at 80-100℃ to obtain activated organic bismuth-germanium framework material; wherein, the mass ratio of diethylamine phosphate, organic bismuth-germanium framework material and deionized water is 0.3:1:15;

[0075] Step 4: Mix the activated organic bismuth-germanium framework material with deionized water, then add bismuth selenide nanomaterials. After ultrasonic homogenization, introduce the mixture into a reaction vessel and treat it at 120-150℃ for 5-8 hours. After cooling to room temperature, filter and collect the filter residue. Wash the filter residue sequentially with DMF and deionized water, and then dry it in an oven at 80-100℃ to obtain the organic bismuth-germanium framework material. The mass ratio of the activated organic bismuth-germanium framework material, bismuth selenide nanomaterials and deionized water is 1:0.5:10.

[0076] The mixed solvent in step 2 is obtained by mixing methanol and DMF in a volume ratio of 3:1.

[0077] Comparative Example 1

[0078] An oil-water separation membrane is provided, wherein the oil-water separation membrane is a modified polysulfone membrane, which is prepared by loading an organic bismuth framework material onto the surface of the polysulfone membrane, and the surface pore size of the polysulfone membrane is 50-80 μm.

[0079] The preparation method of the organic bismuth framework material is as follows:

[0080] Weigh 1,3,5-pyromellitic acid and add it to an organic solvent. After stirring evenly, add potassium bismuth citrate and stir again. Pour the mixture into a reaction vessel lined with polytetrafluoroethylene. Heat the mixture to 180–200°C and maintain the temperature for 24–36 hours. After naturally cooling to room temperature, collect the solid product by filtration. Wash the solid product sequentially with DMF and deionized water, and then dry it in an oven at 80–100°C to obtain the organobismuth framework material. The mass ratio of 1,3,5-pyromellitic acid, potassium bismuth citrate, and organic solvent is 1:3:9.

[0081] Comparative Example 2

[0082] An oil-water separation membrane, wherein the oil-water separation membrane is a polysulfone membrane, and the surface pore size of the polysulfone membrane is 50-80 μm.

[0083] To more clearly illustrate the present invention, the performance of the oil-water separation membranes prepared in Examples 1-3, Comparative Example 1, and Comparative Example 2 was compared under the same conditions. The thickness of the oil-water separation membranes prepared in Examples 1-3, Comparative Example 1, and Comparative Example 2 was 50 μm. The test results are shown in Table 1.

[0084] Table 1 Performance of different oil-water separation membranes

[0085] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Angle of contact with water (°) 132 128 135 121 98 <![CDATA[Water flux (L / m 2 ·h)]]> 570～620 550～600 565～615 275～325 180～200 Oil-water separation rate (%) 97.5 95.8 97.3 88.2 78.7

[0086] As can be seen from the test results in Table 1, the oil-water separation membranes prepared in Examples 1-3 of this invention have better hydrophobicity (contact angle with water) and a larger water flux (reaching 570-620 L / m). 2 •h), with a superior oil-water separation rate (up to 97.5%).

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An environmentally friendly automatic slag discharge oil-water separator, characterized in that, The system includes an oil-water separator body, an oil discharge tank, and a purified water tank. The oil discharge tank is connected to the side wall of the oil-water separator body via an oil discharge pipe, and the purified water tank is connected to the bottom of the oil-water separator body via a drain pipe. An inlet is located at the top of the oil-water separator body. The interior of the oil-water separator body contains a first filter plate, a second filter plate, and a third filter plate. One end of the first filter plate is fixed to the left side of the inner wall of the oil-water separator body, while the other end is suspended. One end of the second filter plate is fixed to the right side of the inner wall of the oil-water separator body, while the other end is suspended. The third filter plate... The filter plate is located below the first and second filter plates, and the two ends of the third filter plate are fixed to the inner wall of the oil-water separator body. An oil pump is installed on the oil discharge pipe, and a suction nozzle is installed at the end of the oil discharge pipe that connects to the oil-water separator body. Multiple suspended balls are fixed on the suction nozzle, which is located below the third filter plate. A drain outlet is provided at the bottom of the water tank, and a fourth filter plate is installed on the inner wall of the water tank. The fourth filter plate is an inverted cone shape that is pointed at the bottom and wide at the top. The fourth filter plate includes a porous filter plate and an oil-water separation membrane attached to the porous filter plate. The oil-water separation membrane is a modified polysulfone membrane, which is obtained by loading an organic bismuth-germanium framework material onto the polysulfone membrane. The surface pore size of the polysulfone membrane is 50-80 μm. The preparation method of the organic bismuth-germanium framework material is as follows: Step 1: Weigh out bismuth potassium citrate and carboxyethyl germanium sesquioxide, mix them, and add them to an ultrafine mixing and grinding mill. Grind for 1-2 hours to obtain a mixed powder. The molar ratio of bismuth potassium citrate to carboxyethyl germanium sesquioxide is 1.8-2.2:

1. Step 2: Weigh 1,3,5-pyromellitic acid and add it to the organic solvent. Stir until homogeneous, then add the mixed powder and stir again until homogeneous. Pour the mixture into a reaction vessel lined with polytetrafluoroethylene (PTFE). Heat the mixture to 180–200°C and maintain the temperature for 24–36 hours. After naturally cooling to room temperature, collect the solid product by filtration. Wash the solid product sequentially with DMF and deionized water, and then dry it in an oven at 80–100°C to obtain the organic bismuth-germanium framework material. The mass ratio of 1,3,5-pyromellitic acid, mixed powder, and organic solvent is 1:2.4–3.6:8–10. Step 3: Weigh diethylamine phosphate and mix with deionized water, stir thoroughly until dissolved, add organic bismuth-germanium framework material, heat to 60-80℃, stir for 2-5 hours, then filter and dry the filter residue in an oven at 80-100℃ to obtain activated organic bismuth-germanium framework material; wherein, the mass ratio of diethylamine phosphate, organic bismuth-germanium framework material and deionized water is 0.1-0.3:1:10-15; Step 4: Mix the activated organic bismuth-germanium framework material with deionized water, then add bismuth selenide nanomaterials. After ultrasonic homogenization, introduce the mixture into a reaction vessel and treat it at 120–150℃ for 5–8 hours. After cooling to room temperature, filter and collect the filter residue. Wash the filter residue sequentially with DMF and deionized water, and then dry it in an oven at 80–100℃ to obtain the organic bismuth-germanium framework material. The mass ratio of the activated organic bismuth-germanium framework material, bismuth selenide nanomaterials and deionized water is 1:0.2–0.5:6–10.

2. The environmentally friendly automatic slag discharge oil-water separator according to claim 1, characterized in that, The oil-water separator body has a slag discharge port on one side, and a movable baffle is hinged above the slag discharge port; the slag discharge port is located above the third filter plate.

3. The environmentally friendly automatic slag discharge oil-water separator according to claim 1, characterized in that, The first filter plate is tilted with the left side higher than the right side, and the second filter plate is tilted with the right side higher than the left side; there are multiple first and second filter plates, and each first filter plate and each second filter plate are spaced apart from each other.

4. The environmentally friendly automatic slag discharge oil-water separator according to claim 1, characterized in that, A vibrator is fixed to the lower surface of both the first filter plate and the second filter plate.

5. The environmentally friendly automatic slag discharge oil-water separator according to claim 1, characterized in that, The first filter plate and the second filter plate are made of the same material and have the same pore size. The pore size of the third filter plate is smaller than that of the first filter plate and smaller than that of the second filter plate.

6. The environmentally friendly automatic slag discharge oil-water separator according to claim 1, characterized in that, The fourth filter plate slides up and down along the inner wall of the water purification tank.

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