Salt-containing wastewater treatment device and method for recovering MSM and salt

Abstract

The invention discloses a salt-containing wastewater treatment device and method for recovering MSM and salt, and relates to the technical field of wastewater treatment. To solve the reliability problem; the device specifically comprises a concentration tank and a cavity tank cover fixed on the outer wall of the top of the concentration tank through bolts, a plurality of groups of membrane separation components are arranged on the inner wall of the cavity tank cover, the end parts of the membrane separation components at the same height are connected with the same multi-way pipe, and the other side of the multi-way pipe is connected with a pump I through an on-off valve; the membrane separation assembly comprises a separation membrane, a support frame and a connecting pipe, and the separation membrane is adhered to the outer wall of the support frame. According to the invention, a plurality of membrane separation assemblies are arranged, and each membrane separation assembly is arranged to be a combination of a separation membrane and a support frame, so that on one hand, wastewater can penetrate through the separation membrane through a hollow groove of the support frame, and on the other hand, the support frame can provide reliable support for the separation membrane to prevent the separation membrane from being shrunken by suction to cause passage blocking; and the reliability of membrane separation is ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a saline wastewater treatment apparatus and method for recovering MSM and salt. Background Technology

[0002] Saline wastewater contains a large amount of salt and MSM (dimethyl sulfone). Its recycling and reuse have high economic value and can also avoid pollution. In the existing technology, its recycling generally adopts steps such as oxidation, concentration, heat preservation and salt precipitation, cooling crystallization, and recrystallization, which can efficiently recover MSM and salt from dimethyl sulfoxide (DMSO) wastewater.

[0003] Patent publication number CN 117865394 A discloses an apparatus and method for recovering MSM and salt from saline wastewater, including a thickening tank 1, a membrane treatment device 2, a separation device 3, and a concentration detection device 4. The thickening tank 1 is a fixed-volume cavity, and wastewater containing DMSO is introduced into the thickening tank 1 through a pipe. The membrane treatment device 2 includes a float plate 21, a fixing plate 22, membrane fibers 23, a switching device 25, and a locking device 26.

[0004] The above method has the following shortcomings: it uses membrane fibers to achieve the filtration and concentration of MSM and salt through membrane separation. However, due to the squeezing effect of the membrane fibers in the wastewater during membrane separation and the negative pressure suction force generated on the membrane fiber cavity when the water pump is pumping water, these forces will cause the membrane fiber cavity to be squeezed and closed, causing the membrane wall of the membrane fibers to adhere and unable to form a reliable passage, thus failing to guarantee reliable separation. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a saline wastewater treatment device and method for recovering MSM and salt.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A saline wastewater treatment device for recovering MSM and salt includes a thickening tank and a hollow tank cover that is bolted to the outer wall of the top of the thickening tank. The inner wall of the cavity pool cover is provided with multiple sets of membrane separation components. The ends of the membrane separation components at the same height are connected to the same multi-port pipe, and the other side of the multi-port pipe is connected to a pump through an on / off valve. The membrane separation assembly includes a separation membrane, a support frame, and a connecting tube. The separation membrane is bonded to the outer wall of the support frame, and both ends of the separation membrane are sealed to the support frame with adhesive. The support frame has uniformly spaced perforated grooves on the inner wall of the area covered by the separation membrane. The support frame is designed with one end open, and the connecting tube is welded to the side wall of the open end of the support frame. Each of the concentration tanks is equipped with a set of valve control components located above each group of membrane separation components at the same height. The valve control components are electrically connected to the on / off valves located immediately below them.

[0007] Preferably, the bottom side of the concentration tank is connected to an inlet / outlet valve via an inlet / outlet pipe.

[0008] Furthermore: the opening and closing valve includes a valve body and a control shell fixed to the top outer wall of the valve body. The inner wall of the valve body is provided with an outlet water channel and an inlet water channel that are interconnected. The inner wall of the thickening tank is also slidably connected to a valve plate through a valve stem. A groove that cooperates with the valve plate to seal is provided at the intersection of the outlet water channel and the inlet water channel.

[0009] Based on the aforementioned scheme: an electromagnet is fixed to the outer wall of the other end of the valve stem, a permanent magnet that cooperates with the electromagnet is fixed to the inner wall of the control housing, and a spring is fastened to the top outer wall of the electromagnet, with the other end of the spring fastened to the inner wall of the control housing.

[0010] A preferred embodiment of the aforementioned scheme is that the valve control assembly includes a connecting pipe and two opposing electrode heads. The connecting pipe is fixed and connected to the inner cavity of the concentration tank, and the electrode heads are fixed through the inner wall of the connecting pipe. The two electrode heads are connected in series to the electromagnet power supply circuit in the corresponding on / off valve.

[0011] As a further aspect of the present invention: in two adjacent sets of membrane separation components, they are staggered in the longitudinal space, and multiple spray heads are fixed at the bottom of the cavity cover. Pump 2 is fixed to the top outer wall of the cavity cover by bolts. A water inlet communicating with the inner cavity of the cavity cover is provided at the top of the cavity cover. The water inlet of pump 2 is connected to a chemical cleaning agent, and the water outlet of pump 2 is connected to the water inlet.

[0012] Meanwhile, the connecting pipe is rotatably connected to the side wall of the thickening tank, and a mechanical seal is provided at the rotatable connection between the thickening tank and the connecting pipe for sealing. The other end of the connecting pipe is rotatably connected to the inner wall of the multi-port pipe, and a sealing ring is provided at the rotatable connection between the connecting pipe and the multi-port pipe for sealing.

[0013] As a preferred embodiment of the present invention: a gear is also fixed to the outer wall of the connecting pipe, and the same rack is meshed on one side of the gear at the same height, and the rack is slidably connected to the side wall of the thickening tank.

[0014] Meanwhile, a sliding rod is slidably connected to the side wall of the thickening tank, and a connecting rod is rotatably connected to the outer wall of the sliding rod. The other end of the connecting rod is rotatably connected to the end of the rack.

[0015] As a preferred embodiment of the present invention: a connecting shaft is fixedly extended from the outer wall of the main shaft of the second pump, a turntable is fixed to the outer wall of the connecting shaft, a connecting rod is rotatably connected to the eccentric part of the turntable, and the other end of the connecting rod is rotatably connected to the end of the slide rod.

[0016] A method for treating saline wastewater for recovering MSM and salt includes the following steps: S1: Wastewater pretreatment, which involves filtration / centrifugation, adsorption / oxidation, and pH adjustment of wastewater; S2: Concentration and preliminary separation: Concentration is carried out using a saline wastewater treatment device, followed by preliminary desalination; S3: Deep separation of MSM from salt, using solvent extraction or membrane separation methods; S4: Product purification, further purification of the separated product; S5: Resource utilization and wastewater treatment, and recycling and concentration of crystallization mother liquor.

[0017] The beneficial effects of this invention are as follows: This invention sets up multiple membrane separation components, and at the same time sets up the membrane separation components as a combination of separation membrane and support frame. On the one hand, the hollow groove of the support frame can ensure that wastewater can pass through the separation membrane. On the other hand, the support frame can also provide reliable support for the separation membrane, prevent the separation membrane from being "sucked down" and causing passage blockage, and ensure the reliability of membrane separation.

[0018] Based on the separation of multiple membrane separation components, this invention groups the membrane separation components at different heights and controls the opening and closing of the passage through the sensing of the valve control component and the control of the opening and closing valve, thereby preventing the liquid level from dropping below the membrane separation components and causing air to be sucked in, thus further ensuring the reliability of separation.

[0019] By setting the on / off valve based on the electromagnetic on / off principle and by setting up an outlet flow channel, the on / off control of the valve is realized by utilizing the conductivity of salt in wastewater. This gives it both the automation effect of electronic control and the high sensitivity of mechanical control.

[0020] By setting up components such as spray heads and pumps, it can spray chemical cleaning agents to clean the separation membrane, thereby preventing scale buildup and blockage on the membrane surface. At the same time, the membrane separation components are arranged longitudinally in a staggered manner to prevent spray dead zones.

[0021] Based on the cleaning process using chemical cleaning agent spraying, the separation membrane is designed to be rotatable. This ensures that the chemical cleaning agent can be sprayed onto all angles of the separation membrane, and the centrifugal force of the rotation can also be used to throw the chemical cleaning agent adhering to the separation membrane onto the rest of the membrane surface, further preventing cleaning dead zones. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the membrane separation pipeline of the present invention.

[0024] Figure 3 This is a schematic diagram of the membrane separation component structure of the present invention.

[0025] Figure 4 This is a schematic diagram of the opening and closing valve structure of the present invention.

[0026] Figure 5 This is a schematic diagram of the valve control component structure of the present invention.

[0027] Figure 6 This is a schematic diagram of the installation position of the spray head of the present invention.

[0028] Figure 7 This is a cross-sectional view of the connection structure between the connecting pipe and the thickening tank and the multi-port pipe of the present invention.

[0029] Figure 8 This is a schematic diagram of the rotating drive part of the membrane separation component of the present invention.

[0030] Figure 9 For the present invention Figure 8 Enlarged structural diagram of section A.

[0031] In the diagram: 1. Thickening tank; 2. Hollow tank cover; 3. Membrane separation assembly; 4. Multi-port pipe; 5. On / off valve; 6. Inlet / outlet pipe; 7. Inlet / outlet valve; 8. Separation membrane; 9. Hollow groove; 10. Support frame; 11. Connecting pipe; 12. Valve control assembly; 13. Valve housing; 14. Outlet channel; 15. Inlet channel; 16. Valve plate; 17. Valve stem; 18. Permanent magnet; 19. Electromagnet; 20. Spring; 21. Control housing; 22. Connecting pipe; 23. Electrode head; 24. Spray head; 25. Sealing ring; 26. Mechanical seal; 27. Rack; 28. Slide rod; 29. ​​Connecting rod one; 30. Pump two; 31. Turntable; 32. Connecting shaft; 33. Water inlet; 34. Connecting rod two; 35. Gear. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Example 1: A saline wastewater treatment device for recovering MSM and salt, such as Figures 1-9 As shown, it includes a thickening tank 1 and a cavity tank cover 2 that is fixed to the top outer wall of the thickening tank 1 by bolts. The inner wall of the cavity tank cover 2 is provided with multiple sets of membrane separation components 3. The ends of the membrane separation components 3 located at the same height are connected to the same multi-port pipe 4. The other side of the multi-port pipe 4 is connected to a pump 1 through an on / off valve 5.

[0035] The membrane separation assembly 3 includes a separation membrane 8, a support frame 10, and a connecting pipe 11. The separation membrane 8 is bonded to the outer wall of the support frame 10, and both ends of the separation membrane 8 are sealed to the support frame 10 with adhesive. The support frame 10 has uniformly spaced perforated grooves 9 on the inner wall of the area covered by the separation membrane 8. The support frame 10 is designed with one end open, and the connecting pipe 11 is welded to the side wall of the open end of the support frame 10.

[0036] Each of the concentration tanks 1 is equipped with a set of valve control components 12 located above each set of membrane separation components 3 at the same height. The valve control components 12 are electrically connected to the on / off valve 5 located immediately below them.

[0037] The bottom side of the concentration tank 1 is connected to an inlet / outlet valve 7 via an inlet / outlet pipe 6.

[0038] In this embodiment, the format of the inlet / drain pipe 6 and the inlet / drain valve 7 is not limited. They can be a set of inlet and drain functions with spacing, or two sets of functions that are responsible for inlet and drain respectively.

[0039] When using this device, wastewater can be connected to the inlet / outlet valve 7 and transported to the thickening tank 1. Then, pump 1 is started, which generates negative pressure, which is transmitted to the inner cavity of the support frame 10. The wastewater enters the inner cavity of the support frame 10 through the separation membrane 8 under the action of negative pressure and gravity. During the entry process, MSM and salt are separated. Subsequently, the wastewater is discharged through pump 1. As separation continues, the thickening tank 1 stores concentrate, which is then discharged through the inlet / outlet valve 7. At the same time, during the membrane separation process, when the liquid level in the thickening tank 1 drops to the top of the membrane separation component 3 at a certain height, the corresponding valve control component 12 senses the liquid level and closes the on / off valve 5 connected to the membrane separation component 3.

[0040] This device, by setting up multiple membrane separation components 3, and simultaneously setting the membrane separation components 3 as a combination of separation membrane 8 and support frame 10, can ensure that wastewater can pass through separation membrane 8 through the hollow groove 9 of support frame 10. On the other hand, support frame 10 can also provide reliable support for separation membrane 8, preventing the separation membrane 8 from being "sucked down" and causing passage blockage, thus ensuring the reliability of membrane separation.

[0041] In addition, this device, based on the setting of multiple membrane separation components 3 for separation, groups the membrane separation components 3 at different heights, and the opening and closing of the passage can be controlled by the sensing of the valve control component 12 and the control of the opening and closing valve 5, thereby preventing the liquid level from dropping below the membrane separation component 3 and causing air to be sucked in, thus further ensuring the reliability of separation.

[0042] To solve the problem of liquid level control; such as Figure 4 , 5 As shown, the opening and closing valve 5 includes a valve housing 13 and a control housing 21 fixed to the top outer wall of the valve housing 13. The inner wall of the valve housing 13 is provided with an outlet channel 14 and an inlet channel 15 that are interconnected. The inner wall of the thickening tank 1 is also slidably connected to a valve plate 16 through a valve stem 17. A groove is provided at the intersection of the outlet channel 14 and the inlet channel 15 to seal with the valve plate 16.

[0043] An electromagnet 19 is fixed to the outer wall of the other end of the valve stem 17, and a permanent magnet 18 that cooperates with the electromagnet 19 is fixed to the inner wall of the control housing 21. A spring 20 is fastened to the top outer wall of the electromagnet 19, and the other end of the spring 20 is fastened to the inner wall of the control housing 21.

[0044] The valve control assembly 12 includes a connecting pipe 22 and two opposing electrode heads 23. The connecting pipe 22 is fixed and connected to the inner cavity of the thickening tank 1. The electrode heads 23 are fixed through the inner wall of the connecting pipe 22, and the two electrode heads 23 are connected in series to the power supply circuit of the electromagnet 19 in the corresponding opening and closing valve 5.

[0045] When the wastewater level in the initial thickening tank 1 is high, the wastewater will enter the inner wall of the connecting pipe 22. At this time, because the wastewater contains salt, it has good conductivity, so the two electrode heads 23 are connected, which causes the electromagnet 19 to be energized and generate a magnetic field. The magnetic field generated by the electromagnet 19 and the magnetic field of the permanent magnet 18 generate a magnetic repulsion force. The magnetic repulsion force overcomes the elastic force of the spring 20, causing the electromagnet 19 to move. The valve plate 16 separates from the groove, and the outlet flow channel 14 is connected to the inlet flow channel 15. The opening and closing valve 5 is in the open state. As the liquid level drops until it is lower than the connecting pipe 22, the wastewater in the connecting pipe 22 flows back into the thickening tank 1, which causes the two electrode heads 23 to disconnect, the electromagnet 19 to disconnect, the spring 20 to return to its original position, and the valve plate 16 to cooperate with the groove to block the inlet flow channel 15 and the outlet flow channel 14.

[0046] This device, by setting the opening and closing valve 5 based on the electromagnetic opening and closing principle and by setting the water outlet channel 14, utilizes the conductivity of the salt in the wastewater to realize the opening and closing control of the opening and closing valve 5, thus giving it both the automation effect of electronic control and the high sensitivity of mechanical control.

[0047] Wastewater can be connected via inlet / outlet valve 7 and transported to thickening tank 1. Then, pump one is started, generating negative pressure, which is transmitted to the inner cavity of support frame 10. The wastewater, under negative pressure and gravity, passes through separation membrane 8 into the inner cavity of support frame 10. During this process, MSM and salt are separated. The wastewater is then discharged via pump one. With continued separation, thickening tank 1 stores concentrate, which is then discharged via inlet / outlet valve 7. Simultaneously, during membrane separation, when the initial wastewater level in thickening tank 1 is high, wastewater will enter the inner wall of connecting pipe 22. At this point, because the wastewater contains salt, its conductivity is good, therefore... When the two electrode heads 23 are connected, the electromagnet 19 is energized and generates a magnetic field. The magnetic field generated by the electromagnet 19 and the magnetic field of the permanent magnet 18 generate a magnetic repulsion force. The magnetic repulsion force overcomes the elastic force of the spring 20, causing the electromagnet 19 to move. The valve plate 16 separates from the groove, and the water outlet channel 14 is connected to the water inlet channel 15. The on / off valve 5 is in the open state. As the liquid level drops until it is lower than the connecting pipe 22, the wastewater in the connecting pipe 22 flows back to the thickening tank 1, thereby causing the two electrode heads 23 to disconnect, the electromagnet 19 to disconnect, the spring 20 to return to its original position, and the valve plate 16 to cooperate with the groove to block the water inlet channel 15 and the water outlet channel 14.

[0048] Example 2: A saline wastewater treatment device for recovering MSM and salt, such as Figures 1-9 As shown, in order to solve the cleaning problem, this embodiment makes the following improvements based on embodiment 1: In the two adjacent sets of membrane separation components 3, they are staggered in the longitudinal space. At the same time, multiple spray heads 24 are fixed at the bottom of the cavity cover 2. Pump 2 30 is fixed to the top outer wall of the cavity cover 2 by bolts. A water inlet 33 communicating with the inner cavity of the cavity cover 2 is provided at the top of the cavity cover 2. The water inlet of pump 2 30 is connected to the chemical cleaning agent, and the water outlet of pump 2 30 is connected to the water inlet 33.

[0049] After a period of use, pump 2 30 can be started, which draws in chemical cleaning agent and delivers it into the cavity of the cavity cover 2, and then sprays it onto the surface of the separation membrane 8 through multiple spray nozzles 24 for cleaning.

[0050] This device, by setting up components such as spray head 24 and pump 2 30, can spray chemical cleaning agent to clean the separation membrane 8, thereby preventing scale buildup and blockage on the surface of the separation membrane 8. At the same time, the membrane separation components 3 are arranged longitudinally in a staggered manner to prevent spray dead zones.

[0051] The connecting pipe 11 is rotatably connected to the side wall of the thickening tank 1, and a mechanical seal 26 is provided at the rotatable connection between the thickening tank 1 and the connecting pipe 11 for sealing. The other end of the connecting pipe 11 is rotatably connected to the inner wall of the multi-port pipe 4, and a sealing ring 25 is provided at the rotatable connection between the connecting pipe 11 and the multi-port pipe 4 for sealing.

[0052] The outer wall of the connecting pipe 11 is also fixed with a gear 35. The gear 35 of the same height is meshed with the same rack 27 on one side. The rack 27 is slidably connected to the side wall of the thickening tank 1. The side wall of the thickening tank 1 is also slidably connected with a slide rod 28. The outer wall of the slide rod 28 is rotatably connected to a connecting rod 29. The other end of the connecting rod 29 is rotatably connected to the end of the rack 27.

[0053] A connecting shaft 32 is fixedly extended from the outer wall of the main shaft of the second pump 30. A turntable 31 is fixed to the outer wall of the connecting shaft 32. A connecting rod 34 is rotatably connected to the eccentric part of the turntable 31. The other end of the connecting rod 34 is rotatably connected to the end of the slide rod 28.

[0054] When pump 2 30 starts spray cleaning, it also drives the connecting shaft 32 to rotate, which in turn drives the slide bar 28 to move up and down through the turntable 31 and connecting rod 2 34, and then drives the rack 27 to move left and right through the connecting rod 1 29, which in turn drives the connecting pipe 11, support frame 10 and separation membrane 8 to rotate back and forth through the gear 35. On the one hand, the rotation can ensure that the chemical cleaning agent can be sprayed to all angles of the separation membrane 8, and on the other hand, the centrifugal force of the rotation can also be used to throw the chemical cleaning agent attached to the separation membrane 8 onto the surface of the rest of the separation membrane 8.

[0055] This device, based on the cleaning by spraying chemical cleaning agents, makes the separation membrane 8 a rotatable structure. On the one hand, the rotation ensures that the chemical cleaning agent can be sprayed to all angles of the separation membrane 8. On the other hand, the centrifugal force of the rotation can also throw the chemical cleaning agent attached to the separation membrane 8 onto the surface of the rest of the separation membrane 8, further preventing dead corners in the cleaning process.

[0056] In this embodiment, after a period of use, pump 2 30 can be started to draw in the chemical cleaner and deliver it into the cavity of the cavity cover 2. Then, it is sprayed onto the surface of the separation membrane 8 through multiple spray nozzles 24 for cleaning. At the same time, when pump 2 30 starts spraying and cleaning, it will also drive the connecting shaft 32 to rotate, thereby driving the slide bar 28 to move up and down through the turntable 31 and the connecting rod 2 34. Then, the rack 27 will move left and right through the connecting rod 1 29, thereby driving the connecting pipe 11, the support frame 10, and the separation membrane 8 to rotate back and forth through the gear 35. On the one hand, the rotation can ensure that the chemical cleaner can be sprayed to all angles of the separation membrane 8. On the other hand, the centrifugal force of the rotation can also be used to throw the chemical cleaner attached to the separation membrane 8 onto the surface of the rest of the separation membrane 8.

[0057] A method for treating saline wastewater for recovering MSM and salt includes the following steps: 1. Wastewater pretreatment Filtration / centrifugation: Removes suspended solids, grease and other impurities.

[0058] Adsorption / Oxidation: If organic impurities are present, activated carbon can be added for adsorption or advanced oxidation methods (such as Fenton, ozone) can be used to degrade the interfering substances.

[0059] pH adjustment: Adjust the pH based on the stability of MSM and salt (MSM may decompose under acidic or alkaline conditions, so control the pH to be near neutral).

[0060] 2. Concentration and preliminary separation Membrane concentration was performed using the apparatus described in Example 1 or 2.

[0061] Low-temperature vacuum evaporation: avoids high-temperature decomposition of MSM (MSM has a boiling point of 238°C, but prolonged high temperatures may cause degradation).

[0062] Preliminary desalination: If the salt concentration is extremely high, it can be evaporated until the salt is nearly saturated, and then filtered or centrifuged while hot to separate some of the salt (such as NaCl precipitating at high temperature).

[0063] 3. Deep separation of MSM from salt Solvent extraction method: MSM is soluble in a variety of organic solvents (such as methanol, ethanol, and acetone), but insoluble in inorganic salts.

[0064] The concentrate was mixed with the solvent, and the MSM was extracted. The salt remained in the aqueous phase.

[0065] The solvent was recovered by distillation to obtain crude MSM.

[0066] Membrane separation method: Small molecule salts are selectively separated using nanofiltration (NF) or electrodialysis, while retaining the micromolecular salt (MSM).

[0067] Organic solvent resistant membranes were selected, and the MSM rejection rate was tested.

[0068] 4. Product purification MSM recrystallization: Recrystallize with pure water or an ethanol-water mixture to improve the purity of MSM.

[0069] Salt recycling: The mother liquor after MSM separation is further evaporated and crystallized to obtain industrial salt.

[0070] If the salt contains impurities, it is purified by dissolving, decolorizing with activated carbon, and recrystallizing.

[0071] 5. Resource recovery and wastewater treatment The mother liquor from crystallization can be recycled and concentrated to improve the recovery rate.

[0072] If the wastewater is ultimately harmless, it can be discharged or further treated biologically.

[0073] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A saline wastewater treatment device for recovering MSM and salt, comprising a thickening tank (1) and a hollow tank cover (2) fixed to the top outer wall of the thickening tank (1), characterized in that, The inner wall of the cavity cover (2) is provided with multiple sets of membrane separation components (3). The ends of the membrane separation components (3) at the same height are connected to the same multi-port pipe (4). The other side of the multi-port pipe (4) is connected to a pump through an on / off valve (5). The membrane separation assembly (3) includes a separation membrane (8), a support frame (10), and a connecting pipe (11). The separation membrane (8) is bonded to the outer wall of the support frame (10), and both ends of the separation membrane (8) are sealed to the support frame (10) with adhesive. The support frame (10) has uniformly perforated grooves (9) on the inner wall of the area covered by the separation membrane (8). The support frame (10) is designed with one end open, and the connecting pipe (11) is welded to the side wall of the open end of the support frame (10). Each of the thickening tanks (1) is equipped with a set of valve control components (12) above each set of membrane separation components (3) at the same height. The valve control components (12) are electrically connected to the on / off valve (5) immediately below them.

2. The saline wastewater treatment device for recovering MSM and salt according to claim 1, characterized in that, The bottom side of the thickening tank (1) is connected to an inlet / outlet valve (7) via an inlet / outlet pipe (6).

3. The saline wastewater treatment device for recovering MSM and salt according to claim 1, characterized in that, The valve (5) includes a valve housing (13) and a control housing (21) fixed to the top outer wall of the valve housing (13). The inner wall of the valve housing (13) is provided with an outlet channel (14) and an inlet channel (15) that are interconnected. The inner wall of the thickening tank (1) is also slidably connected to a valve plate (16) via a valve stem (17). A groove is provided at the intersection of the outlet channel (14) and the inlet channel (15) to seal with the valve plate (16).

4. A saline wastewater treatment device for recovering MSM and salt according to claim 3, characterized in that, An electromagnet (19) is fixed to the outer wall of the other end of the valve stem (17), and a permanent magnet (18) that cooperates with the electromagnet (19) is fixed to the inner wall of the control housing (21). A spring (20) is fastened to the top outer wall of the electromagnet (19), and the other end of the spring (20) is fastened to the inner wall of the control housing (21).

5. A saline wastewater treatment device for recovering MSM and salt according to claim 4, characterized in that, The valve control assembly (12) includes a connecting pipe (22) and two opposing electrode heads (23). The connecting pipe (22) is fixed and connected to the inner cavity of the thickening tank (1). The electrode heads (23) are fixed through the inner wall of the connecting pipe (22), and the two electrode heads (23) are connected in series to the power supply circuit of the electromagnet (19) in the corresponding opening and closing valve (5).

6. A saline wastewater treatment device for recovering MSM and salt according to claim 1, characterized in that, In the two adjacent membrane separation components (3), they are staggered in the longitudinal space. At the same time, multiple spray heads (24) are fixed at the bottom of the cavity cover (2). Pump 2 (30) is fixed to the top outer wall of the cavity cover (2) by bolts. The top of the cavity cover (2) is provided with a water inlet (33) that communicates with the inner cavity of the cavity cover (2). The water inlet of pump 2 (30) is connected to a chemical cleaning agent, and the water outlet of pump 2 (30) is connected to the water inlet (33).

7. A saline wastewater treatment device for recovering MSM and salt according to claim 6, characterized in that, The connecting pipe (11) is rotatably connected to the side wall of the thickening tank (1), and a mechanical seal (26) is provided at the rotatable connection between the thickening tank (1) and the connecting pipe (11) for sealing. The other end of the connecting pipe (11) is rotatably connected to the inner wall of the multi-port pipe (4), and a sealing ring (25) is provided at the rotatable connection between the connecting pipe (11) and the multi-port pipe (4) for sealing.

8. A saline wastewater treatment device for recovering MSM and salt according to claim 7, characterized in that, The outer wall of the connecting pipe (11) is also fixed with a gear (35), and the same rack (27) meshes with the same height on one side of the gear (35), and the rack (27) is slidably connected to the side wall of the thickening tank (1).

9. A saline wastewater treatment device for recovering MSM and salt according to claim 8, characterized in that, The side wall of the thickening tank (1) is also slidably connected to a slide rod (28), and the outer wall of the slide rod (28) is rotatably connected to a connecting rod (29), and the other end of the connecting rod (29) is rotatably connected to the end of the rack (27). The outer wall of the main shaft of the second pump (30) is fixed with a connecting shaft (32), and the outer wall of the connecting shaft (32) is fixed with a turntable (31). The eccentric part of the turntable (31) is rotatably connected to the second connecting rod (34), and the other end of the second connecting rod (34) is rotatably connected to the end of the slide rod (28).

10. A method for treating saline wastewater for recovering MSM and salt, comprising using a saline wastewater treatment apparatus for recovering MSM and salt as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Wastewater pretreatment, including filtration / centrifugation, adsorption / oxidation, and pH adjustment of wastewater; S2: Concentration and preliminary separation: Concentration is carried out using a saline wastewater treatment device, followed by preliminary desalination; S3: Deep separation of MSM from salt, using solvent extraction or membrane separation methods; S4: Product purification, further purification of the separated product; S5: Resource utilization and wastewater treatment, and recycling and concentration of crystallization mother liquor.

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