Device for organic solvent recovery membrane separation

Abstract

The utility model relates to the technical field of water treatment, and provides a device for organic solvent recovery and membrane separation, which comprises a raw water pipeline and a nanofiltration membrane system, a nanofiltration membrane assembly is arranged in the nanofiltration membrane system, a pretreatment system is arranged between the raw water pipeline and the nanofiltration membrane system, and the pretreatment system is used for carrying out primary treatment on raw water. A concentrated water collecting assembly is arranged at a concentrated water outlet of the nanofiltration membrane system, a produced water collecting assembly is arranged at a produced water outlet of the nanofiltration membrane system, and a reverse cleaning assembly is further arranged between the produced water collecting assembly and the nanofiltration membrane system and used for cleaning the nanofiltration membrane system. The pretreatment system comprises a raw water adjusting tank, a lifting pump, an impurity blocking assembly, a buffer water tank and a booster pump, and the raw water pipeline is communicated with the raw water adjusting tank. According to the technical scheme, the problems that in the prior art, the resin cannot be completely removed while absorbing the organic solvent, and only the organic solvent of a single system can be adsorbed are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a device for organic solvent recovery and membrane separation. Background Art

[0002] At present, the organic wastewater generated by chemical production of cellulose ether contains some COD and organic solvents such as formamide, propylene glycol, and propylene glycol methyl ether. There are many methods for treating organic wastewater, such as adsorption treatment with adsorption columns, molecular sieve adsorption of organic solvents in wastewater, etc. When treating wastewater containing organic solvents by adsorption method, resin is generally used as adsorbent. After the adsorbent adsorbs a certain amount of organic solvent, acid and alkali regeneration is used to restore the adsorption capacity. At this time, the organic solvent is transferred to the regenerated wastewater, and finally the organic solvent can be obtained by distillation.

[0003] However, the above technical solution still has the following problems when applied:

[0004] The resin cannot remove all organic solvents while absorbing them, and can only absorb organic solvents of a single system; acid and alkali are used for regeneration, and there is also input of raw materials for acid and alkali. Based on this, we propose a device for organic solvent recovery membrane separation Utility Model Content

[0005] The utility model provides a device for organic solvent recovery membrane separation, which solves the problem in the related art that the resin cannot remove all the organic solvents while absorbing them and can only absorb the organic solvent of a single system.

[0006] The technical solution of the utility model is as follows: A device for organic solvent recovery membrane separation, comprising a raw water pipeline and a nanofiltration membrane system, a nanofiltration membrane assembly is arranged inside the nanofiltration membrane system, a pretreatment system is arranged between the raw water pipeline and the nanofiltration membrane system, the pretreatment system is used to perform preliminary treatment on the raw water, the concentrate outlet of the nanofiltration membrane system is provided with a concentrate collection assembly, the produced water outlet of the nanofiltration membrane system is provided with a produced water collection assembly, a backwash assembly is further arranged between the produced water collection assembly and the nanofiltration membrane system, and the backwash assembly is used to clean the nanofiltration membrane system.

[0007] Preferably, the pretreatment system includes a raw water regulating tank, a lifting pump, an impurity-blocking component, a buffer water tank and a booster pump. The raw water pipeline is connected to the raw water regulating tank. A transmission pipeline A is provided between the input end of the lifting pump and the raw water regulating tank. A transmission pipeline B is installed between the output end of the lifting pump and the water inlet of the impurity-blocking component. A transmission pipeline is fixedly connected between the water outlet of the impurity-blocking component and the buffer water tank. A booster pipeline A is fixedly connected between the input end of the booster pump and the buffer water tank. A booster pipeline B is fixedly connected between the output end of the booster pump and the water inlet of the nanofiltration membrane system.

[0008] Preferably, the concentrated water collection component includes a concentrated water pipe, a concentrated water tank and a concentrated water pump. The outlet of the concentrated water of the nanofiltration membrane system is fixedly connected to the concentrated water pipe, and the end of the concentrated water pipe away from the nanofiltration membrane system is connected to the concentrated water tank. A concentrated water outlet pipe is fixedly connected between the input end of the concentrated water pump and the concentrated water tank, and the output end of the concentrated water pump is fixedly connected to a concentrated water use pipe.

[0009] Preferably, the water production collection component includes a water production pipeline, a water production pool and a water production pump. The water outlet of the nanofiltration membrane system is fixedly connected to the water production pipeline, and the end of the water production pipeline away from the nanofiltration membrane system is connected to the water production pool. A water production outlet pipe is fixedly connected between the input end of the water production pump and the water production pool, and the output end of the water production pump is fixedly connected to a water production use pipe.

[0010] Preferably, the backwash component includes a backwash pump, a backwash pipe A and a backwash pipe B. The input end of the backwash pump is fixedly connected to the backwash pipe B, and the end of the backwash pipe B away from the backwash pump is connected to the water production pipe. The output end of the backwash pump is fixedly connected to the backwash pipe A, and the end of the backwash pipe A away from the backwash pump is also connected to the nanofiltration membrane system.

[0011] Preferably, the impurity barrier assembly includes a metal filter device body, a blocking arc plate, an impurity barrier net, an avoidance gap and an extension seat, the inner side of the blocking arc plate is fixedly connected to the impurity barrier net, the outer side of the metal filter device body is provided with an avoidance gap, and the impurity barrier net passes through the avoidance gap and is arranged inside the metal filter device body, the outer side of the blocking arc plate is fixedly connected to the extension seat, the top of the extension seat is rotatably connected to the transmission screw, the outer side of the transmission screw is threadedly connected to the displacement push plate, the outer side of the blocking arc plate is also fixedly connected to the guide slide bar, the two ends of the outer side of the guide slide bar are slidably connected to the displacement seat, the two ends of the displacement seats away from each other are fixedly connected to the locking rod, the ends of the two displacement seats close to each other are obliquely fixedly connected to the guide plates, and the two ends of the displacement push plate are respectively slidably connected to the middle parts of the two guide plates, the outer side of the metal filter device body is also fixedly connected to the matching lock seat, and the locking rod is clamped and connected to the middle part of the guide plate.

[0012] Preferably, the nanofiltration membrane system is provided with a pH meter, a flow meter and a pressure gauge. The pH meter is used to detect the acidity and alkalinity of the water quality, the flow meter is used to observe the flow rate of the material at the inlet and outlet of the nanofiltration membrane system, and the pressure gauge is used to observe the pressure of the material at the inlet and outlet of the nanofiltration membrane system.

[0013] Preferably, the nanofiltration membrane system is also provided with a chemical cleaning component, and the water inlet pipe of the chemical cleaning component is connected to the outlet end of the metal filtration device body, the water inlet of the nanofiltration membrane system to the inlet of the nanofiltration membrane component through a tee, and the return pipe of the chemical cleaning component is respectively arranged on the water production outlet and the concentrated water outlet pipe of the nanofiltration membrane component.

[0014] Preferably, a guide slot is provided in the middle of the guide plate, and both ends of the top of the displacement push plate are fixedly connected with guide pins, and the displacement push plate is connected to the inside of the guide slot through the guide pins.

[0015] The working principle and beneficial effects of the utility model are as follows:

[0016] The utility model can realize the recovery of organic wastewater and the removal of organic solvents, reduce the difficulty of sewage treatment, and has small footprint and high efficiency. It can achieve energy conservation and emission reduction of high-organic solvent wastewater at a lower operating cost, and solve the problem of difficult treatment of high-COD and high-organic solvent wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 This is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic structural diagram of the impurity barrier component of the utility model;

[0020] Figure 3 This is a schematic diagram of the removal structure of the transfer pipe of the utility model;

[0021] Figure 4 This is a schematic diagram of the connection structure between the displacement push plate and the guide plate of the utility model;

[0022] Figure 1: Raw water pipeline; 2: Nanofiltration membrane system; 3: Raw water regulating tank; 4: Lifting pump; 5: Transmission pipeline A; 6: Transmission pipeline B; 7: Impurity barrier assembly; 8: Transfer pipeline; 9: Buffer water tank; 10: Booster pump; 11: Booster pipeline A; 12: Booster pipeline B; 13: Brine pipeline; 14: Brine tank; 15: Brine pump; 16: Brine outlet pipe; 17: Brine use pipe; 18: Produced water pipeline; 19: Produced water tank ; 20. Water production pump; 21. Water production outlet pipe; 22. Water production use pipe; 23. Backwash pump; 24. Backwash pipe A; 25. Backwash pipe B; 26. Metal filter device body; 27. Arc blocking plate; 28. Debris blocking net; 29. Avoidance gap; 30. Extension seat; 31. Drive screw; 32. Displacement push plate; 33. Guide slide rod; 34. Displacement seat; 35. Locking rod; 36. Guide plate; 37. Locking seat. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] like Figures 1 to 4 As shown, this embodiment proposes a device for organic solvent recovery membrane separation, including a raw water pipeline 1 and a nanofiltration membrane system 2, a nanofiltration membrane assembly is provided inside the nanofiltration membrane system 2, a pretreatment system is provided between the raw water pipeline 1 and the nanofiltration membrane system 2, the pretreatment system is used to perform preliminary treatment on the raw water, the concentrated water outlet of the nanofiltration membrane system 2 is provided with a concentrated water collection assembly, the produced water outlet of the nanofiltration membrane system 2 is provided with a produced water collection assembly, and a backwash assembly is further provided between the produced water collection assembly and the nanofiltration membrane system 2, and the backwash assembly is used to clean the nanofiltration membrane system 2;

[0026] Furthermore, in this embodiment, the nanofiltration membrane assembly uses an organic solvent sodium filtration special membrane or a spiral-wound polyamide composite film element to efficiently remove organic molecules from the pretreated raw water;

[0027] The nanofiltration membrane assembly is a conventional 8-inch membrane assembly on the market, which is highly replaceable.

[0028] The pretreatment system includes a raw water regulating tank 3, a lifting pump 4, an impurity barrier component 7, a buffer water tank 9 and a booster pump 10. The raw water pipeline 1 is connected to the raw water regulating tank 3. A transmission pipeline A5 is provided between the input end of the lifting pump 4 and the raw water regulating tank 3. A transmission pipeline B6 is provided between the output end of the lifting pump 4 and the water inlet of the impurity barrier component 7. A transmission pipeline 8 is fixedly connected between the water outlet of the impurity barrier component 7 and the buffer water tank 9. A booster pipeline A11 is fixedly connected between the input end of the booster pump 10 and the buffer water tank 9. A booster pipeline B12 is fixedly connected between the output end of the booster pump 10 and the water inlet of the nanofiltration membrane system 2.

[0029] The concentrate collection assembly includes a concentrate pipe 13, a concentrate tank 14, and a concentrate pump 15. The concentrate outlet of the nanofiltration membrane system 2 is fixedly connected to the concentrate pipe 13, and the end of the concentrate pipe 13 away from the nanofiltration membrane system 2 is connected to the concentrate tank 14. A concentrate outlet pipe 16 is fixedly connected between the input end of the concentrate pump 15 and the concentrate tank 14. The output end of the concentrate pump 15 is fixedly connected to a concentrate use pipe 17.

[0030] The produced water collection assembly includes a produced water pipeline 18, a produced water pool 19, and a produced water pump 20. The water outlet of the nanofiltration membrane system 2 is fixedly connected to the produced water pipeline 18, and the end of the produced water pipeline 18 away from the nanofiltration membrane system 2 is connected to the produced water pool 19. A produced water outlet pipe 21 is fixedly connected between the input end of the produced water pump 20 and the produced water pool 19, and a produced water use pipe 22 is fixedly connected to the output end of the produced water pump 20.

[0031] The backwash assembly includes a backwash pump 23, a backwash pipe A24 and a backwash pipe B25. The input end of the backwash pump 23 is fixedly connected to the backwash pipe B25, and the end of the backwash pipe B25 away from the backwash pump 23 is connected to the water production pipe 18. The output end of the backwash pump 23 is fixedly connected to the backwash pipe A24, and the end of the backwash pipe A24 away from the backwash pump 23 is also connected to the nanofiltration membrane system 2.

[0032] In detail, the nanofiltration membrane system 2 is provided with a pH meter, a flow meter and a pressure gauge. The pH meter is used to detect the acidity and alkalinity of the water quality, the flow meter is used to observe the flow rate of the material at the inlet and outlet of the nanofiltration membrane system 2, and the pressure gauge is used to observe the inlet and outlet material pressure of the nanofiltration membrane system 2;

[0033] Furthermore, the nanofiltration membrane system 2 is also provided with a chemical cleaning component (not shown in the figure). The water inlet pipeline of the chemical cleaning component is connected to the outlet end of the metal filter device body 26, the water inlet of the nanofiltration membrane system 2 and the inlet of the nanofiltration membrane component through a tee. The return pipeline of the chemical cleaning component is respectively provided on the product water outlet and the concentrated water outlet pipeline of the nanofiltration membrane component;

[0034] Example 2

[0035] like Figures 1 to 4 As shown, based on the same concept as the above embodiment 1, this embodiment further proposes an impurity barrier component 7;

[0036] In this embodiment, the impurity blocking component 7 includes a metal filter device body 26, a blocking arc plate 27, a blocking net 28, an avoidance gap 29 and an extension seat 30. The inner side of the blocking arc plate 27 is fixedly connected to the impurity blocking net 28. The outer side of the metal filter device body 26 is provided with an avoidance gap 29, and the impurity blocking net 28 passes through the avoidance gap 29 and is arranged inside the metal filter device body 26. The outer side of the blocking arc plate 27 is fixedly connected to the extension seat 30. The top of the extension seat 30 is rotatably connected to the transmission screw 31, and the outer side of the transmission screw 31 is threadedly connected. A displacement push plate 32 is connected, and a guide slide 33 is fixedly connected to the outside of the arc blocking plate 27. Both ends of the outer side of the guide slide 33 are slidably connected to a displacement seat 34. The ends of the two displacement seats 34 that are away from each other are fixedly connected to a locking rod 35. The ends of the two displacement seats 34 that are close to each other are fixedly connected to a guide plate 36 at an angle, and the two ends of the displacement push plate 32 are respectively slidably connected to the middle of the two guide plates 36. The outer side of the metal filter device body 26 is also fixedly connected to a matching lock seat 37, and the locking rod 35 is snap-connected to the middle of the guide plate 36.

[0037] In detail, in this embodiment, the metal filter device body 26 is a security filter or a bag filter;

[0038] Preferably, a guide groove is opened in the middle of the guide plate 36, and guide pins are fixedly connected to both ends of the top of the displacement push plate 32. The displacement push plate 32 is connected to the inside of the guide groove through the guide pins. By utilizing the structural cooperation of the guide groove and the guide pin, when the displacement push plate 32 is linearly displaced, the guide pin can be driven to move inside the guide groove, thereby pushing the guide plate 36 and driving the locking rod 35 to displace.

[0039] A specific application of the above two embodiments is that the organic wastewater generated by the production of cellulose ether in the chemical industry will be transferred through the raw water pipeline 1 to the raw water regulating tank 3 for storage. Then, the wastewater in the raw water regulating tank 3 will be pumped out by the operation of the lifting pump 4 and sent to the metal filter body 26 through the transmission pipeline B6. The wastewater entering the metal filter body 26 will first contact the impurity barrier 28, thereby blocking the particulate matter and suspended matter in the organic wastewater.

[0040] By setting the metal filter body 26, the organic wastewater can be filtered to reduce the turbidity and SDI value of the organic wastewater, and the buffer water tank 9 is set to facilitate the temporary storage of the water pre-treated by the metal filter body 26 when the nanofiltration membrane system 2 replaces the nanofiltration membrane assembly or the subsequent nanofiltration membrane system 2 is shut down for a short time. By setting the booster pump 10, the liquid in the buffer water tank 9 can be pumped out through the booster pipe A11, and the liquid is allowed to enter the nanofiltration membrane system 2 at a certain flow rate through the booster pipe B12 for filtration treatment; the concentrated water and produced water treated by the nanofiltration membrane system 2 are respectively discharged through the concentrated water pipe 13 and the produced water pipe 12. The channel 18 enters the concentrated water pool 14 and the production water pool 19. The water in the concentrated water pool 14 and the production water pool 19 then passes through the concentrated water pump 15 and the production water pump 20 to supply the liquid to the water point. In combination with the backwash pump 23, the liquid in the production water pool 19 can be introduced into the nanofiltration membrane system 2 through the production water pipe 18, the backwash pipe B25 and the backwash pipe A24. The nanofiltration membrane assembly is backwashed regularly to remove pollutants deposited on the surface of the nanofiltration membrane assembly due to filtration, so that it can operate normally. The washing water uses nanofiltration production water with good water quality. The device is not equipped with a separate backwash water tank, and the water in the production water pool 19 is directly supplied as the backwash water source.

[0041] At the same time, the device is equipped with complete valve instruments, such as pressure gauge, high and low pressure protection control components, flow meter, conductivity, liquid level meter, pH meter, etc., to ensure the detection of relevant parameters in the system during operation;

[0042] When the blocking effect of the debris blocking net 28 is not good, rotating the transmission screw 31 to cooperate with the displacement push plate 32 connected to the transmission screw 31 will cause the displacement push plate 32 to move along the transmission screw 31 and simultaneously pull the two guide plates 36. Since the guide plates 36 are tilted, they can drive the locking rod 35 to move out of the locking seat 37, thereby unlocking the blocking arc plate 27. Then the debris blocking net 28 can be pulled out from the avoidance gap 29 for cleaning.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for organic solvent recovery membrane separation, characterized in that: The invention comprises a raw water pipeline (1) and a nanofiltration membrane system (2), wherein a nanofiltration membrane assembly is provided inside the nanofiltration membrane system (2), a pretreatment system is provided between the raw water pipeline (1) and the nanofiltration membrane system (2), and the pretreatment system is used for performing preliminary treatment on the raw water, a concentrated water outlet of the nanofiltration membrane system (2) is provided with a concentrated water collection assembly, a produced water outlet of the nanofiltration membrane system (2) is provided with a produced water collection assembly, and a backwash assembly is further provided between the produced water collection assembly and the nanofiltration membrane system (2), and the backwash assembly is used for cleaning the nanofiltration membrane system (2).

2. The device for organic solvent recovery membrane separation according to claim 1, characterized in that: The pretreatment system comprises a raw water regulating tank (3), a lifting pump (4), an impurity barrier component (7), a buffer water tank (9) and a booster pump (10), wherein the raw water pipeline (1) is connected to the raw water regulating tank (3), a transmission pipeline A (5) is provided between the input end of the lifting pump (4) and the raw water regulating tank (3), a transmission pipeline B (6) is provided between the output end of the lifting pump (4) and the water inlet of the impurity barrier component (7), a transmission pipeline (8) is fixedly connected between the water outlet of the impurity barrier component (7) and the buffer water tank (9), a booster pipeline A (11) is fixedly connected between the input end of the booster pump (10) and the buffer water tank (9), and a booster pipeline B (12) is fixedly connected between the output end of the booster pump (10) and the water inlet of the nanofiltration membrane system (2).

3. The device for organic solvent recovery membrane separation according to claim 1, characterized in that: The concentrated water collection component includes a concentrated water pipeline (13), a concentrated water tank (14) and a concentrated water pump (15). The concentrated water outlet of the nanofiltration membrane system (2) is fixedly connected to the concentrated water pipeline (13), and the end of the concentrated water pipeline (13) away from the nanofiltration membrane system (2) is connected to the concentrated water tank (14). A concentrated water outlet pipe (16) is fixedly connected between the input end of the concentrated water pump (15) and the concentrated water tank (14), and a concentrated water use pipe (17) is fixedly connected to the output end of the concentrated water pump (15).

4. The device for organic solvent recovery membrane separation according to claim 1, characterized in that: The produced water collection component includes a produced water pipeline (18), a produced water pool (19) and a produced water pump (20). The water outlet of the nanofiltration membrane system (2) is fixedly connected to the produced water pipeline (18), and the end of the produced water pipeline (18) away from the nanofiltration membrane system (2) is connected to the produced water pool (19). A produced water outlet pipe (21) is fixedly connected between the input end of the produced water pump (20) and the produced water pool (19), and a produced water use pipe (22) is fixedly connected to the output end of the produced water pump (20).

5. The device for organic solvent recovery membrane separation according to claim 4, characterized in that: The backwash component includes a backwash pump (23), a backwash pipe A (24) and a backwash pipe B (25), wherein the input end of the backwash pump (23) is fixedly connected to the backwash pipe B (25), and the end of the backwash pipe B (25) away from the backwash pump (23) is connected to the water production pipe (18), and the output end of the backwash pump (23) is fixedly connected to the backwash pipe A (24), and the end of the backwash pipe A (24) away from the backwash pump (23) is also connected to the nanofiltration membrane system (2).

6. The device for organic solvent recovery membrane separation according to claim 2, characterized in that: The impurity blocking component (7) includes a metal filter device body (26), a blocking arc plate (27), an impurity blocking net (28), an avoidance gap (29) and an extension seat (30), wherein the inner side of the blocking arc plate (27) is fixedly connected to the impurity blocking net (28), the outer side of the metal filter device body (26) is provided with an avoidance gap (29), and the impurity blocking net (28) passes through the avoidance gap (29) and is arranged inside the metal filter device body (26), the outer side of the blocking arc plate (27) is fixedly connected to the extension seat (30), the top end of the extension seat (30) is rotatably connected to a transmission screw (31), and the outer side of the transmission screw (31) is threadedly connected to the transmission screw (31). A displacement push plate (32) is connected, and the outer side of the blocking arc plate (27) is also fixedly connected to a guide slide bar (33), and both ends of the outer side of the guide slide bar (33) are slidably connected to a displacement seat (34), and the ends of the two displacement seats (34) that are away from each other are fixedly connected to a locking rod (35), and the ends of the two displacement seats (34) that are close to each other are both tilted and fixedly connected to a guide plate (36), and the two ends of the displacement push plate (32) are respectively slidably connected to the middle of the two guide plates (36), and the outer side of the metal filter device body (26) is also fixedly connected to a matching lock seat (37), and the locking rod (35) is snap-connected to the middle of the guide plate (36).

7. The device for organic solvent recovery membrane separation according to claim 5, characterized in that: The nanofiltration membrane system (2) is provided with a pH meter, a flow meter and a pressure gauge. The pH meter is used to detect the acidity and alkalinity of water quality. The flow meter is used to observe the flow rate of the material at the inlet and outlet of the nanofiltration membrane system (2). The pressure gauge is used to observe the pressure of the material at the inlet and outlet of the nanofiltration membrane system (2).

8. The device for organic solvent recovery membrane separation according to claim 6 or 7, characterized in that: The nanofiltration membrane system (2) is also provided with a chemical cleaning component. The water inlet pipeline of the chemical cleaning component is connected to the outlet end of the metal filter device body (26), the water inlet of the nanofiltration membrane system (2) and the inlet of the nanofiltration membrane component through a tee. The return pipeline of the chemical cleaning component is respectively provided on the produced water outlet and the concentrated water outlet pipeline of the nanofiltration membrane component.

9. The device for organic solvent recovery membrane separation according to claim 6, characterized in that: A guide slot is provided in the middle of the guide plate (36), and guide pins are fixedly connected to both ends of the top of the displacement push plate (32), and the displacement push plate (32) is connected to the inside of the guide slot via the guide pins.

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