A multi-layer dialysis device for separating landfill leachate and a method of use

Abstract

The application discloses a kind of multilayer dialysis device and use method for separating landfill leachate, belong to landfill leachate processing technical field, multilayer dialysis device includes magnetic stirring module and multilayer dialysis module;Magnetic stirring module includes magnetic stirring rotor and the magnetic field control device of driving magnetic stirring rotor rotation;Multilayer dialysis module includes the experimental cylinder being set on stirring table, and multiple different diameters and coaxially arranged dialysis cylinders are arranged in experimental cylinder, and magnetic stirring rotor is arranged at the bottom of the smallest diameter dialysis cylinder;By setting multiple dialysis cylinders with different molecular weight cut-off in multilayer dialysis module, and setting magnetic stirring rotor at the bottom of the smallest diameter dialysis cylinder, not only can simultaneously process the dialysis work of multiple molecular weight organic matter and ionic landfill leachate, but also significantly improve the separation efficiency of multiple molecular weight organic matter and ions with magnetic stirring rotor, compared with single membrane technology, more separation tasks can be completed in shorter time.

Description

Technical Field

[0001] This invention belongs to the field of landfill leachate treatment technology, and in particular relates to a multilayer dialysis device and its usage method for separating landfill leachate. Background Technology

[0002] With the acceleration of urbanization, the amount of waste has increased dramatically, and leachate from landfills has become a major challenge for environmental management. Landfill leachate contains high concentrations of soluble pollutants such as organic matter, ammonia nitrogen, and heavy metals; its complex composition makes it difficult to treat. Traditional separation methods, such as solid-phase extraction, adsorption, and chemical precipitation, are inefficient and costly, often failing to effectively separate components of different molecular weights in the leachate, especially large, recalcitrant organic molecules.

[0003] In recent years, membrane separation technology has been widely used in landfill leachate treatment due to its advantages such as high efficiency, energy saving, and ease of operation. However, single-layer membrane dialysis technology is difficult to meet the needs of landfill leachate treatment, especially in separating components with different molecular weights. For example, while traditional reverse osmosis and nanofiltration technologies can effectively separate large molecular organics, their separation effect on small molecular organics is not ideal, and they are easily affected by contaminant clogging and membrane fouling. Secondly, single-layer membranes have limited selectivity, often making it difficult to simultaneously and effectively separate organics with different molecular weights. For example, they may lack sufficient selectivity for smaller molecular weight organics, making it difficult to achieve high-purity separation. Furthermore, the stability of single-layer membranes may not be sufficient to withstand the long-term treatment of organics with different molecular weights, especially under high concentration or complex environmental conditions, where membrane performance is easily affected, increasing operational complexity and cost. Summary of the Invention

[0004] The present invention aims to provide a multilayer dialysis device and method for separating landfill leachate, 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] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0006] A multilayer dialysis device for separating landfill leachate is provided, which includes a magnetic stirring module and a multilayer dialysis module; the magnetic stirring module includes 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 mounted on a stirring table, containing multiple dialysis cylinders of different diameters arranged coaxially. These dialysis cylinders are set up independently of each other. Each dialysis cylinder includes a hollow cylindrical steel frame covered with a dialysis membrane. The dialysis membranes in different dialysis cylinders have different molecular weight cutoffs. The gaps between two adjacent dialysis cylinders and the gap between the outermost dialysis cylinder and the experimental cylinder are filled with ultrapure water. A magnetic stirring rotor is located at the bottom of the dialysis cylinder with the smallest diameter.

[0008] Furthermore, the inner bottom surface of the experimental tube is provided with multiple spiral grooves of different diameters arranged coaxially. Each dialysis tube is matched with one spiral groove, and the bottom of the dialysis tube is sealed to the spiral groove.

[0009] The top of the dialysis cylinder is equipped with multiple knob caps of different diameters arranged coaxially. Each dialysis cylinder is matched with one knob cap, and the top of the dialysis cylinder is sealed to the knob cap.

[0010] Furthermore, each steel frame includes two vertically spaced steel rings, each with a width of 1.5cm; multiple supporting steel frames are arranged between the two steel rings, with the top steel ring of the steel frame having an external thread that mates with the knob cover thread; and the bottom steel ring of the steel frame having an external thread that mates with the spiral groove thread.

[0011] Furthermore, the multiple dialysis cartridges are respectively an outer dialysis cartridge, a middle dialysis cartridge, and an inner dialysis cartridge with decreasing inner diameters; a magnetic stirring rotor is installed inside the inner dialysis cartridge;

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

[0013] Furthermore, the magnetic field control device includes a housing, inside which is a transformer box, inside which is a transformer coil, the transformer coil is electrically connected to a shunt device via a series line, the shunt device is provided with a swivel port, and around the swivel port are magnetic induction coils; the inner dialysis cylinder is located directly above the magnetic induction coils.

[0014] The side of the casing is equipped with a start / stop switch and wires that are electrically connected to the transformer box. The free end of the wire passes through a notch on the side of the casing and is connected to a power plug. A transformer is installed on the wire. The top of the casing is a mixing platform, and the bottom of the casing is equipped with support legs.

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

[0016] Furthermore, the magnetic stirring rotor rotates at a speed of 200 revolutions per minute.

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

[0018] Step 1: Seal and connect the bottoms of the outer dialysis cartridge, the middle dialysis cartridge, and the inner dialysis cartridge to the multi-turn spiral groove inside the experimental cartridge;

[0019] Step 2: Fill the gap between two adjacent dialysis cylinders and the gap between the outermost dialysis cylinder and the experimental cylinder with ultrapure water, and place a magnetic stirring rotor and fill the inner dialysis cylinder with landfill leachate.

[0020] Step 3: Twist the multi-turn knob to seal the top of the outer dialysis cartridge, the middle dialysis cartridge, and the inner dialysis cartridge to form a multi-layer dialysis module;

[0021] Step 4: Place the multilayer dialysis module on the stirring table and start the magnetic field control device to drive the magnetic stirring rotor to run in the inner dialysis cylinder at a preset speed for a preset time.

[0022] Step 5: After the magnetic stirring rotor has finished running, turn off the magnetic field control device, extract the solution between multiple dialysis cylinders and between the dialysis cylinder and the experimental cylinder, and obtain dialysis solutions containing different molecular weights of organic components.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The multilayer dialysis device and its method for separating landfill leachate according to the present invention, by setting multiple dialysis cylinders with different molecular weight cutoffs in the multilayer dialysis module, and setting a magnetic stirring rotor at the bottom of the dialysis cylinder with the smallest diameter, can not only simultaneously process the dialysis of landfill leachate with multiple molecular weights, but also significantly improve the separation efficiency of multiple molecular weights of organic matter and ions in conjunction with the magnetic stirring rotor. Compared with single membrane technology, it can complete more separation tasks in a shorter time.

[0025] 2. The multilayer dialysis device for separating landfill leachate in this invention comprises only two main components: a magnetic stirring module and a multilayer dialysis module. The device has a simple structure; researchers only need 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 module, the separation of different components can be achieved. The operation is simple and quick. The top of the experimental cylinder is equipped with a multilayer knob cap, making assembly and disassembly of the dialysis cylinder simple, facilitating cleaning and maintenance, and making it suitable for daily use in the laboratory.

[0026] 3. The multilayer dialysis device and its method for separating landfill leachate in this invention can flexibly adjust the membrane material and operating parameters of the dialysis membrane in each dialysis cylinder according to factors such as the molecular weight range of specific pollutants and the properties of the solution, so as to adapt to the treatment needs of different types and concentrations of landfill leachate and have higher operational flexibility. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of a multilayer dialysis device for separating landfill leachate.

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

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

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

[0031] Figure 5 This is a schematic diagram of the internal structure of the magnetic field control device.

[0032] The components include: 1. Magnetic stirring module; 2. Multilayer 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. Supporting steel frame; 14. Outer dialysis cylinder; 15. Middle dialysis cylinder; 16. Inner dialysis cylinder; 17. Shell; 18. Transformer box; 19. Transformer coil; 20. Diverter device; 21. Turnstile; 22. Magnetic induction coil; 23. Start / stop switch; 24. Wire; 25. Notch; 26. Power plug; 27. Transformer; 28. Support leg. Detailed Implementation

[0033] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions 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 includes a magnetic stirring module 1 and a multi-layer dialysis module 2; the magnetic stirring module 1 includes 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 platform 5.

[0035] like Figures 1-3 As shown, the multilayer dialysis module 2 includes an experimental cylinder 6 mounted on a stirring table 5. The experimental cylinder 6 can be made of stainless steel, with a sealed bottom and an open top. The height of the experimental cylinder 6 is 45 cm, and its inner diameter is 12 cm. Multiple dialysis cylinders 7 of different diameters are arranged coaxially inside the experimental cylinder 6. These dialysis cylinders 7 are independently arranged. Each dialysis cylinder 7 includes a hollow cylindrical steel frame 8 covered with a dialysis membrane 9. The dialysis membranes 9 in different dialysis cylinders 7 have different molecular weight cutoffs. The gaps between adjacent dialysis cylinders 7 and the gap between the outermost dialysis cylinder 7 and the experimental cylinder 6 are filled with ultrapure water 10. A magnetic stirring rotor 3 is positioned at the bottom of the dialysis cylinder 7 with the smallest diameter. Specifically, the volume of ultrapure water 10 is 2 / 3 of the volume of the gaps between adjacent dialysis cylinders 7 and the gap between the outermost dialysis cylinder 7 and the experimental cylinder 6. The rotation speed of the magnetic stirring rotor 3 is 200 rpm.

[0036] When separating landfill leachate, a magnetic stirring rotor 3 is placed in the smallest diameter dialysis cylinder 7 and filled with landfill leachate. Then, the magnetic stirring rotor 3 is driven to run for a preset time. After the run is completed, the solution in the gap between multiple dialysis cylinders 7 is extracted to obtain a dialysis solution containing different molecular weights of organic components. This enables the simultaneous processing of dialysis of landfill leachate containing multiple molecular weights of organic matter and ions, significantly improving the separation efficiency of multiple molecular weights of organic matter and ions. Compared with single membrane technology, it can complete more separation tasks in a shorter time.

[0037] Specifically, the inner bottom surface of the experimental tube 6 is provided with multiple spiral grooves of different diameters arranged coaxially. Each dialysis tube 7 is matched with one spiral groove, and the bottom of the dialysis tube 7 is sealed to the spiral groove.

[0038] The top of the experimental cylinder 6 is equipped with multiple coaxially arranged knob caps of different diameters. Each dialysis cylinder 7 is matched with one knob cap 11, and the top of the dialysis cylinder 7 is sealed to the knob cap 11. This arrangement ensures that the top and bottom of multiple dialysis cylinders 7 are sealed, allowing for independent operation and preventing solutions from mixing through the gaps between the cylinders, thus avoiding confusion of the dialysis solutions. Furthermore, the knob caps 11 and the screw grooves simplify the assembly and disassembly of the dialysis cylinders 7, facilitating cleaning and maintenance, and making them suitable for daily use in the laboratory.

[0039] like Figure 4As shown, preferably but not limited to, each steel frame 8 includes two vertically spaced steel rings 12, each steel ring 12 having a width of 1.5cm; multiple supporting steel frames 138 are provided between the two steel rings 12; the steel ring 12 at the top of the steel frame 8 is provided with an external thread that engages with the threaded knob cover 11; the steel ring 12 at the bottom of the steel frame 8 is provided with an external thread that engages with the threaded spiral groove.

[0040] Specifically, the multiple dialysis cartridges 7 are an outer dialysis cartridge 14, a middle dialysis cartridge 15, and an inner dialysis cartridge 16 with decreasing inner diameters; the inner diameters of the outer dialysis cartridge 14, the middle dialysis cartridge 15, and the inner dialysis cartridge 16 are 9 cm, 6 cm, and 3 cm, respectively, and a magnetic stirring rotor 3 is disposed inside the inner dialysis cartridge 16; the molecular weight cutoff of the dialysis membrane 9 in the outer dialysis cartridge 14 is 10,000 Da; the molecular weight cutoff of the dialysis membrane 9 in the middle dialysis cartridge 15 is 30,000 Da; and the molecular weight cutoff of the dialysis membrane 9 in the inner dialysis cartridge 16 is 50,000 Da.

[0041] like Figure 1 and Figure 5 As shown, in one specific configuration of the magnetic field control device 4, the magnetic field control device 4 includes a housing 17, inside which is a transformer box 18, inside which is a transformer coil 19, the transformer coil 19 is electrically connected to a shunt device 20 via a series line, the shunt device 20 is provided with a turnout 21, and magnetic induction coils 22 are arranged around the turnout 21; the inner dialysis cylinder 16 is located directly above the magnetic induction coils 22.

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

[0043] When the magnetic field control device 4 is working, the power plug 26 is connected to an external power source. Then, the on / off switch 23 is turned on, energizing the transformer coil 19 and the shunt device 20. This energizes the magnetic induction coil 22, generating a rotating magnetic field. Due to the magnetic 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 rotates along with the magnetic field. As the magnetic field continuously changes, the magnetic stirring rotor 3 generates a continuous rotating motion within the inner dialysis cylinder 16. This rotational motion effectively stirs the landfill leachate, ensuring uniform mixing and accelerating the separation process.

[0044] In summary, the multilayer dialysis device for separating landfill leachate in this invention comprises only two main components: a magnetic stirring module 1 and a multilayer dialysis module 2. The device has a simple structure, and 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 of using a multilayer dialysis device for separating landfill leachate, comprising:

[0046] Step 1: Seal and connect the bottoms of the outer dialysis cartridge 14, the middle dialysis cartridge 15, and the inner dialysis cartridge 16 to the multi-turn spiral groove inside the experimental cartridge 6.

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

[0048] Step 3: Twist the multi-turn knob cap 11 to seal the top of the outer dialysis cartridge 14, the middle dialysis cartridge 15 and the inner dialysis cartridge 16 to form the multi-layer dialysis module 2;

[0049] Step 4: Place the multilayer dialysis module 2 on the stirring table 5, and start the magnetic field control device 4 to drive the magnetic stirring rotor 3 to run in the inner dialysis cylinder 16 at a preset speed for a preset time.

[0050] Step 5: After the magnetic stirring rotor 3 has finished running, turn off the magnetic field control device 4, and extract the solution between multiple dialysis cylinders 7 and between the dialysis cylinder 7 and the experimental cylinder 6 to obtain a dialysis solution containing different molecular weights of organic components.

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

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

Claims

1. A multilayer dialysis device for separating landfill leachate, characterized in that, It includes a magnetic stirring module and a multilayer dialysis module; the magnetic stirring module includes 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 multilayer dialysis module includes an experimental cylinder mounted on the stirring table. The experimental cylinder contains multiple dialysis cylinders of different diameters arranged coaxially. These dialysis cylinders are independently configured. Each dialysis cylinder includes a hollow cylindrical steel frame covered with a dialysis membrane. The dialysis membranes in different dialysis cylinders have different molecular weight cutoffs. The gaps between adjacent dialysis cylinders and the gap between the outermost dialysis cylinder and the experimental cylinder are filled with ultrapure water. A magnetic stirring rotor is positioned at the bottom of the dialysis cylinder with the smallest diameter. The inner bottom surface of the experimental tube is provided with multiple spiral grooves of different diameters arranged coaxially. Each dialysis tube is matched with one spiral groove, and the bottom of the dialysis tube is sealed to the spiral groove. The top of the experimental tube is provided with multiple knob caps of different diameters arranged coaxially. Each dialysis tube is matched with one knob cap, and the top of the dialysis tube is sealed to the knob cap. The plurality of dialysis cartridges are respectively an outer dialysis cartridge, a middle dialysis cartridge, and an inner dialysis cartridge with decreasing inner diameter; the magnetic stirring rotor is disposed inside the inner dialysis cartridge; The molecular weight cutoff of the dialysis membrane in the outer dialysis cartridge is 10,000 Da; the molecular weight cutoff of the dialysis membrane in the middle dialysis cartridge is 30,000 Da; and the molecular weight cutoff of the dialysis membrane in the inner dialysis cartridge is 50,000 Da.

2. The multilayer dialysis device for separating landfill leachate according to claim 1, characterized in that, Each of the steel frames includes two vertically spaced steel rings, each steel ring being 1.5cm wide; multiple supporting steel frames are arranged between the two steel rings, with the top steel ring of the steel frame having an external thread that mates with the threaded knob cover; and the bottom steel ring of the steel frame having an external thread that mates with the threaded spiral groove.

3. The multilayer dialysis device for separating landfill leachate according to claim 2, characterized in that, The magnetic field control device includes a housing, inside which is a transformer box, and inside the transformer box is a transformer coil. The transformer coil is electrically connected to a shunt device via a series line. The shunt device has a rotating port, and magnetic induction coils are arranged around the rotating port. The inner dialysis cylinder is located directly above the magnetic induction coils. The side of the housing is provided with a start / stop switch and a wire that are electrically connected to the transformer box. The free end of the wire passes through a notch on the side of the housing and is connected to a power plug. A transformer is installed on the wire. The top of the housing is the stirring platform, and the bottom of the housing is provided with support legs.

4. The multilayer 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 cylinders and the gap between the outermost dialysis cylinder and the experimental cylinder.

5. The multilayer dialysis device for separating landfill leachate according to claim 4, characterized in that, The magnetic stirring rotor rotates at a speed of 200 revolutions per minute.

6. A method of using the multilayer dialysis apparatus for separating landfill leachate according to any one of claims 3-5, characterized in that, include: Step 1: Seal and connect the bottoms of the outer dialysis cartridge, the middle dialysis cartridge, and the inner dialysis cartridge to the multi-turn spiral groove inside the experimental cartridge; Step 2: Fill the gap between two adjacent dialysis cylinders and the gap between the outermost dialysis cylinder and the experimental cylinder with ultrapure water, and place a magnetic stirring rotor and fill the inner dialysis cylinder with landfill leachate. Step 3: Twist the multi-turn knob to seal the top of the outer dialysis cartridge, the middle dialysis cartridge, and the inner dialysis cartridge to form a multi-layer dialysis module; Step 4: Place the multilayer dialysis module on the stirring table and start the magnetic field control device to drive the magnetic stirring rotor to run in the inner dialysis cylinder at a preset speed for a preset time. Step 5: After the magnetic stirring rotor has finished running, turn off the magnetic field control device, extract the solution between multiple dialysis cylinders and between the dialysis cylinder and the experimental cylinder, and obtain dialysis solutions containing different molecular weights of organic components.

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