Multilayer dialysis device for separating landfill leachate and use method

Abstract

The invention discloses a multi-layer dialysis device for separating landfill leachate and a using method, and belongs to the technical field of landfill leachate treatment.The multi-layer dialysis device comprises a magnetic stirring module and a multi-layer dialysis module; the magnetic stirring module comprises a magnetic stirring rotor and a magnetic field control device for driving the magnetic stirring rotor to rotate; the multi-layer dialysis module comprises an experiment cylinder arranged on the stirring table, a plurality of dialysis cylinders which are different in diameter and are coaxially arranged are arranged in the experiment cylinder, and a magnetic stirring rotor is arranged at the bottom of the dialysis cylinder with the smallest diameter; a plurality of dialysis cylinders with different cut-off molecular weights are arranged in a multi-layer dialysis module, and a magnetic stirring rotor is arranged at the bottom of the dialysis cylinder with the smallest diameter, so that organic matters with various molecular weights and dialysis work of ionic landfill leachate can be treated at the same time; in addition, the magnetic stirring rotor is matched, so that the separation efficiency of organic matters and ions with various molecular weights is remarkably improved, and compared with a single membrane technology, more separation tasks can be completed within shorter time.

Description

Technical Field

[0001] The invention belongs to the technical field of landfill leachate treatment, and in particular relates to a multi-layer dialysis device for separating landfill leachate and a use method thereof. Background Art

[0002] With the acceleration of urbanization, garbage production has increased dramatically, and leachate from landfills has become a major problem in environmental governance. Leachate contains high concentrations of organic matter, ammonia nitrogen, heavy metals and other soluble pollutants, and its composition is complex and difficult to treat. Traditional separation methods, such as solid phase extraction, adsorption, chemical precipitation, etc., are inefficient and costly, and often have difficulty in effectively separating different molecular weight components in leachate, especially large molecular weight organic matter that is difficult to degrade.

[0003] In recent years, membrane separation technology has been widely used in the field of landfill leachate treatment technology due to its advantages such as high efficiency, energy saving, and simple operation. However, single-layer membrane dialysis technology is difficult to meet the needs of landfill leachate treatment, especially in the separation of components with different molecular weights. For example, although traditional reverse osmosis and nanofiltration technologies can effectively separate large molecular organic matter, the separation effect for small molecular organic matter is not ideal, and it is easily affected by pollutant clogging and membrane pollution. Secondly, the selectivity of single-layer membranes is limited, and it is often difficult to effectively separate organic matter with different molecular weights at the same time. For example, there may be a lack of sufficient selectivity for organic matter with smaller molecular weights, making it difficult to achieve high-purity separation. In addition, the stability of single-layer membranes may not be sufficient to withstand the long-term treatment of organic matter with different molecular weights, especially under high concentrations or complex environmental conditions, the performance of the membrane is easily affected, increasing the complexity and cost of the operation. Summary of the invention

[0004] The present invention aims to provide a multilayer dialysis device for separating landfill leachate and a method for using the device, which solves the problem that the existing single-layer membrane dialysis technology has limited selectivity and is difficult to simultaneously and effectively separate organic landfill leachate and ionic landfill leachate with different molecular weights.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0006] A multilayer dialysis device for separating landfill leachate is provided, which comprises a magnetic stirring module and a multilayer dialysis module; the magnetic stirring module comprises a magnetic stirring rotor and a magnetic field control device for driving the magnetic stirring rotor to rotate; the top of the magnetic field control device is a stirring platform;

[0007] The multilayer dialysis module includes an experimental cylinder arranged on a stirring table, wherein a plurality of dialysis cylinders with different diameters and arranged coaxially are arranged in the experimental cylinder, and the plurality of dialysis cylinders are arranged independently of each other, and each dialysis cylinder includes a steel frame with a hollow cylindrical structure, and the steel frame is covered with a dialysis membrane; the dialysis membranes in different dialysis cylinders have different molecular weight cutoffs; the gap between two adjacent dialysis cylinders and the gap between the outermost dialysis cylinder and the experimental cylinder are filled with ultrapure water; and the magnetic stirring rotor is arranged at the bottom of the dialysis cylinder with the smallest diameter.

[0008] Furthermore, the inner bottom surface of the experimental cylinder is provided with a plurality of spiral grooves with different diameters and arranged coaxially, each dialysis cylinder is matched with a spiral groove, and the bottom of the dialysis cylinder is sealedly connected to the spiral groove;

[0009] The top of the experimental cylinder is provided with a plurality of knob covers with different diameters and arranged coaxially, each dialysis cylinder is matched with a knob cover, and the top of the dialysis cylinder is sealedly connected with the knob cover.

[0010] Furthermore, each steel frame includes two steel rings arranged vertically at intervals, and the width of each steel ring is 1.5 cm; multiple supporting steel frames are arranged between the two steel rings, and the steel ring located at the top of the steel frame is provided with an external thread that cooperates with the knob cover thread; the steel ring located at the bottom of the steel frame is provided with an external thread that cooperates with the spiral slot thread.

[0011] Furthermore, the plurality of dialysis cylinders are respectively an outer dialysis cylinder, a middle dialysis cylinder and an inner dialysis cylinder with decreasing inner diameters; the magnetic stirring rotor is arranged in the inner dialysis cylinder;

[0012] The molecular weight cutoff of the dialysis membrane in the outer dialysis tube is 10,000 Da; the molecular weight cutoff of the dialysis membrane in the middle dialysis tube is 30,000 Da; and the molecular weight cutoff of the dialysis membrane in the inner dialysis tube is 50,000 Da.

[0013] Furthermore, the magnetic field control device comprises a shell, a transformer box is arranged inside the shell, a transformer coil is arranged inside the transformer box, the transformer coil is electrically connected to a shunt device through a series line, a transfer port is arranged on the shunt device, and a magnetic induction coil is arranged around the transfer port; the inner dialysis cylinder is located directly above the magnetic induction coil;

[0014] A start-stop switch and a wire electrically connected to the transformer box are arranged on the side of the shell. The free end of the wire passes through the notch on the side of the shell and is connected to a power plug. A transformer is arranged on the wire. The top of the shell is a mixing table and the bottom of the shell is provided with supporting legs.

[0015] Furthermore, the volume of the ultrapure water is 2 / 3 of the volume of the gap between two adjacent dialysis tubes and the gap between the outermost dialysis tube and the experimental tube.

[0016] Furthermore, the rotation speed of the magnetic stirring rotor is 200 rpm.

[0017] The present invention also provides a method for using a multilayer dialysis device for separating landfill leachate, comprising:

[0018] Step 1, respectively sealingly connecting the bottoms of the outer dialysis tube, the middle dialysis tube and the inner dialysis tube to the multi-turn spiral grooves in the experimental tube;

[0019] Step 2: Fill the gap between two adjacent dialysis tubes and the gap between the outermost dialysis tube and the experimental tube with ultrapure water, and place a magnetic stirring rotor in the inner dialysis tube and fill it with landfill leachate;

[0020] Step 3, twist the knob cover several times to seal the outer dialysis tube, the middle dialysis tube and the top of the inner dialysis tube to form a multi-layer dialysis module;

[0021] Step 4: placing the multi-layer dialysis module on a stirring table, and starting the magnetic field control device to drive the magnetic stirring rotor to run at a preset speed for a preset time in the inner dialysis cylinder;

[0022] Step 5: After the operation of the magnetic stirring rotor is completed, the magnetic field control device is turned off, and the solution in the gaps between the multiple dialysis cylinders and between the dialysis cylinder and the experimental cylinder is extracted to obtain a dialysis solution containing different molecular weights of organic components.

[0023] The beneficial effects of the present invention are:

[0024] 1. A multilayer dialysis device for separating landfill leachate and a method of use of the present invention, by arranging multiple dialysis cartridges with different molecular weight cutoffs in the multilayer dialysis module and arranging a magnetic stirring rotor at the bottom of the dialysis cartridge with the smallest diameter, can not only simultaneously handle the dialysis work of landfill leachate with organic matter and ions of various molecular weights, but also significantly improve the separation efficiency of organic matter and ions of various molecular weights in combination with the magnetic stirring rotor. Compared with single membrane technology, more separation tasks can be completed in a shorter time.

[0025] 2. The multilayer dialysis device for separating landfill leachate in the present invention only includes two main bodies, namely, a magnetic stirring module and a multilayer dialysis module. The device has a simple structure. The experimenter only needs to introduce the landfill leachate into the multilayer dialysis module. By controlling the pore size and number of layers of the dialysis membrane in the multilayer dialysis module, the separation of different components can be achieved. The operation process is simple and fast. A multilayer knob cover is provided on the top of the experimental cylinder, which makes it easy to assemble and disassemble the dialysis cylinder, and is convenient for cleaning and maintenance of the dialysis cylinder, and is suitable for daily use in the laboratory.

[0026] 3. The multilayer dialysis device and use method for separating landfill leachate in the present invention can flexibly adjust the membrane material and operating parameters of the dialysis membrane in each dialysis cartridge according to factors such as the molecular weight range of specific pollutants and the properties of the solution, adapt to the treatment needs of landfill leachate of different types and concentrations, and have higher operational flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of a multilayer dialysis device for separating landfill leachate.

[0028] Figure 2 This is a schematic diagram of the elevation and section structure of the multi-layer dialysis module.

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of a multi-layer dialysis module.

[0030] Figure 4 A schematic diagram of the three-dimensional structure of a single steel frame.

[0031] Figure 5 Schematic diagram of the internal structure of the magnetic field control device.

[0032] Among them, 1. Magnetic stirring module; 2. Multi-layer dialysis module; 3. Magnetic stirring rotor; 4. Magnetic field control device; 5. Stirring table; 6. Experimental cylinder; 7. Dialysis cylinder; 8. Steel frame; 9. Dialysis membrane; 10. Ultrapure water; 11. Knob cover; 12. Steel ring; 13. Support steel frame; 14. Outer dialysis cylinder; 15. Middle dialysis cylinder; 16. Inner dialysis cylinder; 17. Shell; 18. Transformer box; 19. Transformer coil; 20. Diverter; 21. Transfer port; 22. Magnetic induction coil; 23. Start-stop switch; 24. Wire; 25. Notch; 26. Power plug; 27. Transformer; 28. Support leg. DETAILED DESCRIPTION

[0033] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0034] like Figure 1 As shown, the present invention provides a multi-layer dialysis device for separating landfill leachate, which comprises a magnetic stirring module 1 and a multi-layer dialysis module 2; the magnetic stirring module 1 comprises a magnetic stirring rotor 3 and a magnetic field control device 4 for driving the magnetic stirring rotor 3 to rotate; the top of the magnetic field control device 4 is a stirring table 5;

[0035] like Figure 1 to Figure 3 As shown, the multilayer dialysis module 2 includes an experimental cylinder 6 arranged on a stirring platform 5. The experimental cylinder 6 can be made of a stainless steel cylinder. The bottom of the experimental cylinder 6 is sealed and the top has an opening. The height of the experimental cylinder 6 is 45 cm, and the inner diameter of the experimental cylinder 6 is 12 cm. A plurality of dialysis cylinders 7 with different diameters and coaxial arrangement are arranged in the experimental cylinder 6. The plurality of dialysis cylinders 7 are independently arranged. Each dialysis cylinder 7 includes a steel frame 8 in a hollow cylindrical structure, and the steel frame 8 is covered with a dialysis membrane 9. The molecular weight cutoff of the dialysis membrane 9 in different dialysis cylinders 7 is different. The gap between two adjacent dialysis cylinders 7 and the gap between the outermost dialysis cylinder 7 and the experimental cylinder 6 are filled with ultrapure water 10. The magnetic stirring rotor 3 is arranged at the bottom of the dialysis cylinder 7 with the smallest diameter. Specifically, the volume of the ultrapure water 10 is 2 / 3 of the volume of the gap between two adjacent dialysis cylinders 7 and the gap between the outermost dialysis cylinder 7 and the experimental cylinder 6, and the rotation speed of the magnetic stirring rotor 3 is 200 rpm.

[0036] When separating the landfill leachate, a magnetic stirring rotor 3 is placed in the dialysis cylinder 7 with the smallest diameter and filled with landfill leachate, and then the magnetic stirring rotor 3 is driven to run for a preset time. After the operation is completed, the solution in the gaps between multiple dialysis cylinders 7 is extracted to obtain a dialysis solution containing different molecular weights of organic components, thereby realizing the dialysis work of simultaneously processing organic matter and ion landfill leachate of multiple molecular weights, significantly improving the separation efficiency of organic matter and ions of multiple molecular weights, and being able to complete more separation tasks in a shorter time compared to single membrane technology.

[0037] Specifically, the inner bottom surface of the experimental cylinder 6 is provided with a plurality of spiral grooves with different diameters and arranged coaxially, each dialysis cylinder 7 is matched with a spiral groove, and the bottom of the dialysis cylinder 7 is sealed and connected to the spiral groove;

[0038] The top of the experimental cylinder 6 is provided with a plurality of knob covers 11 with different diameters and arranged coaxially. Each dialysis cylinder 7 is matched with a knob cover 11, and the top of the dialysis cylinder 7 is sealed and connected with the knob cover 11. The above arrangement enables the top and bottom ends of the multiple dialysis cylinders 7 to be sealed, and realizes independent arrangement, thereby avoiding the phenomenon that the solutions in the gaps between the multiple dialysis cylinders 7 merge with each other through the top or bottom of the dialysis cylinder 7, causing confusion of the dialysis solutions. At the same time, the arrangement of the knob cover 11 and the spiral groove makes the assembly and disassembly of the dialysis cylinder 7 simpler, and is convenient for cleaning and maintenance of the dialysis cylinder 7, and is suitable for daily use in the laboratory.

[0039] like Figure 4As shown, preferably but not limitedly, each steel frame 8 includes two steel rings 12 vertically spaced apart, and the width of each steel ring 12 is 1.5 cm; a plurality of supporting steel frames 138 are arranged between the two steel rings 12, and the steel ring 12 located at the top of the steel frame 8 is provided with an external thread that cooperates with the thread of the knob cover 11; the steel ring 12 located at the bottom of the steel frame 8 is provided with an external thread that cooperates with the spiral groove thread.

[0040] Specifically, the multiple dialysis tubes 7 are respectively an outer dialysis tube 14, a middle dialysis tube 15 and an inner dialysis tube 16 with decreasing inner diameters; the inner diameters of the outer dialysis tube 14, the middle dialysis tube 15 and the inner dialysis tube 16 are 9 cm, 6 cm and 3 cm respectively, and the magnetic stirring rotor 3 is arranged in the inner dialysis tube 16; the molecular weight cutoff of the dialysis membrane 9 in the outer dialysis tube 14 is 10000Da; the molecular weight cutoff of the dialysis membrane 9 in the middle dialysis tube 15 is 30000Da; the molecular weight cutoff of the dialysis membrane 9 in the inner dialysis tube 16 is 50000Da.

[0041] like Figure 1 and Figure 5 As shown, as a specific arrangement of the magnetic field control device 4, the magnetic field control device 4 includes a shell 17, a transformer box 18 is arranged inside the shell 17, a transformer coil 19 is arranged inside the transformer box 18, the transformer coil 19 is electrically connected to a shunt device 20 through a series line, a turntable 21 is arranged on the shunt device 20, and a magnetic induction coil 22 is arranged around the turntable 21; the inner dialysis cylinder 16 is located directly above the magnetic induction coil 22.

[0042] A start-stop switch 23 and a wire 24 electrically connected to the transformer box 18 are provided on the side of the shell 17. The free end of the wire 24 passes through the notch 25 on the side of the shell 17 and is connected to a power plug 26. A transformer 27 is provided on the wire 24. The top of the shell 17 is a mixing table 5, and the bottom of the shell 17 is provided with support legs 28.

[0043] When the magnetic field control device 4 is working, the power plug 26 is connected to the external power supply, and then the start-stop switch 23 is turned on, the transformer coil 19 and the shunt device 20 are energized, so that the magnetic induction coil 22 is energized to generate a rotating magnetic field. Due to the magnetic field attraction between the magnetic properties of the magnetic stirring rotor 3 and the main body of the magnetic induction coil 22, the magnetic stirring rotor 3 will rotate with the rotation of the magnetic field. As the magnetic field continues to change, the magnetic stirring rotor 3 will produce a continuous rotational motion in the inner layer dialysis cartridge 16. The rotational motion of the magnetic stirring rotor 3 can effectively stir the landfill leachate, mix it evenly, and accelerate the separation process.

[0044] In summary, a multilayer dialysis device for separating landfill leachate in the present invention only includes two main bodies, namely a magnetic stirring module 1 and a multilayer dialysis module 2. The device has a simple structure. The experimenter only needs to introduce the landfill leachate into the multilayer dialysis module 2. By controlling the pore size and number of layers of the dialysis membrane 9 in the multilayer dialysis module 2, the separation of different components can be achieved. The operation process is simple and quick.

[0045] The present invention also provides a method for using a multilayer dialysis device for separating landfill leachate, comprising:

[0046] Step 1: Seal and connect the bottoms of the outer dialysis tube 14, the middle dialysis tube 15 and the inner dialysis tube 16 to the multi-turn spiral grooves in the experimental tube 6 respectively;

[0047] Step 2: Fill the gap between two adjacent dialysis tubes 7 and the gap between the outermost dialysis tube 7 and the experimental tube 6 with ultrapure water 10, and place the magnetic stirring rotor 3 in the inner dialysis tube 16 and fill it with landfill leachate;

[0048] Step 3, twist the knob cover 11 for multiple turns to seal the top of the outer dialysis tube 14, the middle dialysis tube 15 and the inner dialysis tube 16 to form a multi-layer dialysis module 2;

[0049] Step 4, placing the multi-layer dialysis module 2 on the stirring platform 5, and starting the magnetic field control device 4 to drive the magnetic stirring rotor 3 to run at a preset speed in the inner dialysis cartridge 16 for a preset time;

[0050] Step 5: After the operation of the magnetic stirring rotor 3 is completed, the magnetic field control device 4 is turned off, and the solution between the plurality of dialysis tubes 7 and between the dialysis tube 7 and the experimental tube 6 is extracted to obtain a dialysis solution containing different molecular weights of organic components.

[0051] In this specific embodiment, since the multiple dialysis tubes 7 are respectively an outer dialysis tube 14, a middle dialysis tube 15 and an inner dialysis tube 16 with decreasing inner diameters, the molecular weight cutoff of the dialysis membrane 9 in the outer dialysis tube 14 is 10,000Da; the molecular weight cutoff of the dialysis membrane 9 in the middle dialysis tube 15 is 30,000Da; the molecular weight cutoff of the dialysis membrane 9 in the inner dialysis tube 16 is 50,000Da, then the molecular weight ranges of the organic components of the dialysis solution obtained are: less than 10,000Da, 10,000Da-30,000Da, 30,000Da-50,000Da and greater than 50,000Da.

[0052] In the above method, the membrane material and operating parameters of the dialysis membrane 9 in each dialysis cartridge 7 can be flexibly adjusted according to factors such as the molecular weight range of specific pollutants and the properties of the solution to meet the treatment requirements of different types and concentrations of leachate, thereby having higher operational flexibility.

Claims

1. A multi-layer dialysis device for separating landfill leachate, characterized in that: It comprises a magnetic stirring module and a multi-layer dialysis module; the magnetic stirring module comprises a magnetic stirring rotor and a magnetic field control device for driving the magnetic stirring rotor to rotate; the top of the magnetic field control device is a stirring platform; The multi-layer dialysis module includes an experimental cylinder arranged on the stirring table, wherein a plurality of dialysis cylinders with different diameters and arranged coaxially are arranged in the experimental cylinder, the plurality of dialysis cylinders are arranged independently of each other, each dialysis cylinder includes a steel frame with a hollow cylindrical structure, and the steel frame is covered with a dialysis membrane; the dialysis membranes in different dialysis cylinders have different molecular weight cutoffs; the gap between two adjacent dialysis cylinders and the gap between the outermost dialysis cylinder and the experimental cylinder are filled with ultrapure water; and the magnetic stirring rotor is arranged at the bottom of the dialysis cylinder with the smallest diameter.

2. The multi-layer dialysis device for separating landfill leachate according to claim 1, characterized in that: The inner bottom surface of the experimental cylinder is provided with a plurality of spiral grooves with different diameters and arranged coaxially, each of the dialysis cylinders is matched with one of the spiral grooves, and the bottom of the dialysis cylinder is sealedly connected to the spiral groove; The top of the experimental cylinder is provided with a plurality of knob covers with different diameters and arranged coaxially, each of the dialysis cylinders is matched with one knob cover, and the top of the dialysis cylinder is sealedly connected with the knob cover.

3. The multi-layer dialysis device for separating landfill leachate according to claim 2, characterized in that: Each of the steel frames includes two steel rings vertically spaced apart, and the width of each of the steel rings is 1.5 cm; a plurality of supporting steel frames are arranged between the two steel rings, and the steel ring located at the top of the steel frame is provided with an external thread that cooperates with the knob cover thread; the steel ring located at the bottom of the steel frame is provided with an external thread that cooperates with the spiral slot thread.

4. The multi-layer dialysis device for separating landfill leachate according to claim 3, characterized in that: The plurality of dialysis cylinders are respectively an outer dialysis cylinder, a middle dialysis cylinder and an inner dialysis cylinder with decreasing inner diameters; the magnetic stirring rotor is arranged in the inner dialysis cylinder; The molecular weight cutoff of the dialysis membrane in the outer dialysis tube is 10,000 Da; the molecular weight cutoff of the dialysis membrane in the middle dialysis tube is 30,000 Da; and the molecular weight cutoff of the dialysis membrane in the inner dialysis tube is 50,000 Da.

5. The multi-layer dialysis device for separating landfill leachate according to claim 4, characterized in that: The magnetic field control device comprises a shell, a transformer box is arranged inside the shell, a transformer coil is arranged inside the transformer box, the transformer coil is electrically connected to a shunt device through a series line, a transfer port is arranged on the shunt device, and a magnetic induction coil is arranged around the transfer port; the inner layer dialysis cylinder is located directly above the magnetic induction coil; A start-stop switch and a wire electrically connected to the transformer box are arranged on the side of the shell. The free end of the wire passes through the notch on the side of the shell and is connected to a power plug. A transformer is arranged on the wire. The top of the shell is the mixing table and the bottom of the shell is provided with support legs.

6. The multi-layer dialysis device for separating landfill leachate according to claim 1, characterized in that: The volume of the ultrapure water is 2 / 3 of the volume of the gap between two adjacent dialysis tubes and the gap between the outermost dialysis tube and the experimental tube.

7. The multi-layer dialysis device for separating landfill leachate according to claim 6, characterized in that: The rotation speed of the magnetic stirring rotor is 200 rpm.

8. A method for using the multilayer dialysis device for separating landfill leachate according to any one of claims 4 to 7, characterized in that: include: Step 1, respectively sealingly connecting the bottoms of the outer dialysis tube, the middle dialysis tube and the inner dialysis tube to the multi-turn spiral grooves in the experimental tube; Step 2: Fill the gap between two adjacent dialysis tubes and the gap between the outermost dialysis tube and the experimental tube with ultrapure water, and place a magnetic stirring rotor in the inner dialysis tube and fill it with landfill leachate; Step 3, twist the knob cover several times to seal the outer dialysis tube, the middle dialysis tube and the top of the inner dialysis tube to form a multi-layer dialysis module; Step 4: placing the multi-layer dialysis module on a stirring table, and starting the magnetic field control device to drive the magnetic stirring rotor to run at a preset speed for a preset time in the inner dialysis cylinder; Step 5: After the operation of the magnetic stirring rotor is completed, the magnetic field control device is turned off, and the solution in the gaps between the multiple dialysis cylinders and between the dialysis cylinder and the experimental cylinder is extracted to obtain a dialysis solution containing different molecular weights of organic components.

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