An electrically driven experimental device for treating antibiotics in sediments

Abstract

The invention relates to an electrically driven experimental device for treating antibiotics in sediments. The device comprises an experimental tank, wherein the experimental tank comprises an anode tank, a reaction tank and a cathode tank. Sediments are placed in the reaction tank. Partitions are respectively provided at both ends of the reaction tank for separating the reaction tank from the anode tank and the cathode tank. A plurality of through holes are evenly provided on the partitions so that electrolytes in the anode tank and the cathode tank can circulate in the reaction tank. The electrolytes contain an oxidant. An anode plate is provided in the anode tank, and a cathode plate is provided in the cathode tank. The anode plate and the cathode plate are connected to an external power supply to energize the experimental tank. A detachable partition frame is provided in the reaction tank. A plurality of horizontal and vertical meshes of the partition frame are enclosed to form a plurality of frames, which divide the reaction tank into a plurality of corresponding areas, thereby facilitating sampling and analysis at different positions during static experiments. The partition frame can move in the reaction tank to promote mixing of sediments and oxidants, thereby facilitating research on sediment treatment effects during dynamic experiments.

Description

Technical Field

[0001] The invention belongs to the technical field of sediment pollution control, and in particular relates to an electric-driven experimental device for treating antibiotics in sediments. Background Art

[0002] With the continuous development of aquaculture, nutrients that promote the growth and proliferation of aquatic products are being added to aquaculture waters in large quantities. Furthermore, antibiotics, essential for the healthy growth of aquatic products, have also been widely used in recent years, leading to a new water pollution problem: antibiotic residues in aquatic sediments, which pose a number of potential risks. For example, antibiotics can induce the presence of resistance genes, which can persist, transfer, and spread in the environment and within organisms through horizontal gene transfer, posing a threat to human and animal health. These resistance genes have been listed by the World Health Organization as one of the three major threats to human health in the 21st century. Consequently, the development of technologies to remove antibiotics from sediments has attracted widespread attention.

[0003] Chemical oxidation technology is an effective method for remediating contaminated soil sediments. Commonly used oxidants include potassium permanganate, persulfate, and Fenton's reagent. Compared to other oxidation technologies, the sulfate radicals produced by persulfate advanced oxidation technology have the advantages of a higher redox potential, a longer half-life, and a wide pH range. However, the remediation effect of this technology also depends on the migration of persulfate in the sediment and the extent of its contact with the pollutants. How to improve the migration of oxidants in the sediment and their contact with the pollutants is a challenge faced by those skilled in the art. Summary of the Invention

[0004] To address the above problems, the present invention provides an electrically driven experimental device for treating antibiotics in sediments, which is used to simulate the process of oxidative treatment of antibiotics in sediments in the laboratory. It combines electrically driven technology with chemical oxidation, and forms an electric field by applying a DC voltage on both sides of the electrodes. Under the action of the electric field, the migration of pollutants and oxidants in the sediments is enhanced. The electrically driven device coupled with persulfate chemical remediation technology can accelerate mass transfer efficiency and improve the remediation effect of the sediments.

[0005] The electrically driven experimental device for treating antibiotics in sediments comprises an experimental tank, which includes an anode tank, a reaction tank, and a cathode tank. Sediments are placed in the reaction tank. Partitions are provided at both ends of the reaction tank to separate the reaction tank from the anode tank and the cathode tank. The partitions are evenly provided with a plurality of through holes to allow electrolytes in the anode tank and the cathode tank to flow in the reaction tank. The electrolytes contain an oxidant. An anode plate is provided in the anode tank, and a cathode plate is provided in the cathode tank. The anode plate and the cathode plate are connected to an external power supply to energize the experimental tank.

[0006] The reaction tank is provided with a detachable partition frame, and the plurality of horizontal and vertical mesh sheets of the partition frame are arranged to form a plurality of frames, which divide the reaction tank into a plurality of areas, so as to facilitate sampling and analysis at different positions during static experiments;

[0007] The partition frame can move in the reaction tank to promote the mixing of sediment and oxidant, which is convenient for studying the treatment effect of sediment during dynamic experiments.

[0008] Optionally, the top or side surface of the anode tank is provided with a water inlet and a water outlet, the bottom is conical and provided with a vent, the container filled with electrolyte is connected to the water inlet of the anode tank via a delivery pump, and the water outlet of the anode tank is connected to the above container via a pipeline, forming a circulating electrolyte flow between the anode tank and the container filled with electrolyte;

[0009] When the electrolyte needs to be replaced, the bottom of the anode tank can quickly drain the original electrolyte to avoid mixing of the original electrolyte and the new electrolyte;

[0010] The structure of the cathode cell is the same as that of the anode cell.

[0011] Optionally, the electrolyte contains a persulfate oxidant, and the electrolyte is a conventional electrolyte, such as a nitrate solution; adding manganese sand to the sediment to be treated can activate the persulfate oxidant.

[0012] Optionally, the partition is a double-layer plate, each plate is evenly provided with a number of through holes, the through holes on the two plates correspond to each other, and filter paper is sandwiched between the two plates, which can fix the position of the filter paper and improve its strength, so that the electrolyte of the anode tank and the cathode tank can enter and exit the reaction tank through the through holes and the filter paper, but prevents sediment from entering and exiting the reaction tank.

[0013] Optionally, the reaction tank is square, and the partition frame includes a plurality of meshes intersecting horizontally and vertically to form a plurality of square frames arranged in an array, and the four top corners of each square frame are rounded chamfers, so that when the partition frame performs a stirring function, dead zones are avoided at the top corners of the square frame to prevent sediment from accumulating;

[0014] The inner side walls of the square frame are all vertical, which can evenly divide the internal space of the reaction tank into several areas of equal volume, and the sediments in each area are not serially connected.

[0015] Further optionally, at least one movable mesh wall that can be opened and closed is provided on the inner side wall of the square frame, the movable mesh wall is vertically arranged, and one side edge is hinged to the inner side wall of the square frame, and the top edge, bottom edge and other side edge of the movable mesh wall are not connected to the square frame, so that the movable mesh wall can be rotated toward the inside of the square frame to open and close;

[0016] When conducting a static experiment, the movable mesh wall is in close contact with the inner wall of the square frame, and the angle between the two is zero. At this time, the side wall of the square frame is a double-layer mesh, and the mesh holes of the movable mesh wall are arranged alternately with the mesh holes of the inner wall of the square frame, so that the mesh hole diameter formed by the double-layer mesh is smaller than the mesh hole diameter of the movable mesh wall and also smaller than the mesh hole diameter of the inner wall of the square frame;

[0017] When a dynamic experiment is carried out, the movable mesh wall rotates toward the inside of the square frame, and the angle between the two is greater than zero. When the partition frame rotates, the side wall of the square frame and the movable mesh wall both play a stirring role.

[0018] Further optionally, the area of ​​the movable mesh wall is equal to the area of ​​the inner side wall of the square frame excluding the rounded chamfers on both sides.

[0019] Further optionally, the square frame of the partition rack closest to the four inner side walls of the reaction tank is detachable. After detachment, space is left between the partition rack and the inner side walls of the reaction tank, which facilitates the movement of the partition rack during stirring.

[0020] Optionally, the electrically driven experimental device includes several samplers for sampling sediment and water in the reaction tank;

[0021] The sampler is a sleeve structure, including an inner sleeve and an outer sleeve. The top surfaces of the outer sleeve and the inner sleeve are open and the bottom surfaces are closed. The inner sleeve can enter the interior of the outer sleeve; the outer wall of the outer sleeve includes a sediment sampling part and a liquid sampling part from bottom to top. The sediment sampling part is at the bottom of the outer sleeve, and the liquid sampling part is evenly distributed with through holes, which are used to allow sediment samples and liquid samples to enter the interior of the outer sleeve respectively; the side of the inner sleeve is also evenly distributed with through holes.

[0022] Further optionally, the bottom of the sediment sampling portion of the outer sleeve is provided with a solid side wall, and the upper part of the solid side wall is a circle of hollow side walls, the hollow shape is a long strip, and the sediment can enter the interior of the outer sleeve through the hollow part. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an electrically driven experimental device for treating antibiotics in sediments;

[0024] Figure 2 This is a three-dimensional internal schematic diagram of the experimental tank;

[0025] Figure 3 It is a partial schematic diagram of the partition frame;

[0026] Figure 4 It is a structural diagram of the sampler;

[0027] Figure 5 Schematic diagram of the sampler when taking liquid samples.

[0028] In the accompanying drawings, 1-experimental tank, 2-anode tank, 3-reaction tank, 4-cathode tank, 5-partition, 6-partition rack, 7-plate, 8-square frame, 9-round chamfer, 10-movable mesh wall, 11-sampler, 12-inner sleeve, 13-outer sleeve, 14-sediment sampling part, 15-liquid sampling part, 16-solid side wall, 17-hollow side wall. DETAILED DESCRIPTION

[0029] This embodiment provides an electrically driven experimental device for treating antibiotics in sediments, such as Figure 1-Figure 5 As shown, the experimental tank 1 includes an anode tank 2, a reaction tank 3 and a cathode tank 4. The sediment is placed in the reaction tank 3. A partition 5 is provided at both ends of the reaction tank 3 to separate the reaction tank 3 from the anode tank 2 and the cathode tank 4. A plurality of through holes are evenly provided on the partition 5 so that the electrolyte in the anode tank 2 and the cathode tank 4 can flow in the reaction tank 3. The electrolyte contains an oxidant. An anode plate is provided in the anode tank 2, and a cathode plate is provided in the cathode tank 4. The anode plate and the cathode plate are connected to an external power supply to energize the experimental tank 1.

[0030] The reaction tank 3 is provided with a detachable partition frame 6, and the plurality of horizontal and vertical meshes of the partition frame 6 are arranged to form a plurality of frames, which divide the reaction tank 3 into a plurality of areas, so as to facilitate sampling and analysis at different positions during static experiments;

[0031] The partition frame 6 can move in the reaction tank 3 to promote the mixing of sediment and oxidant, which is convenient for studying the treatment effect of sediment during dynamic experiments.

[0032] Optionally, the top or side surface of the anode tank 2 is provided with a water inlet and a water outlet, the bottom is conical and provided with a vent, the container filled with electrolyte is connected to the water inlet of the anode tank 2 through a delivery pump, and the water outlet of the anode tank 2 is connected to the above container through a pipeline, forming a circulating electrolyte flow between the anode tank 2 and the container filled with electrolyte;

[0033] When the electrolyte needs to be replaced with a new one, the bottom of the anode tank 2 can quickly drain the original electrolyte to avoid mixing of the original electrolyte with the new electrolyte.

[0034] Optionally, the structure of the cathode tank 4 is the same as that of the anode tank 2. Specifically, the top surface or side surface of the cathode tank 4 is provided with a water inlet and a water outlet, the bottom is conical and provided with a vent, another container filled with electrolyte is connected to the water inlet of the cathode tank 4 via a delivery pump, and the water outlet of the cathode tank 4 is connected to the above-mentioned other container filled with electrolyte via a pipeline, forming a circulating electrolyte flow between the cathode tank 4 and the container;

[0035] When the electrolyte needs to be replaced with a new one, the bottom of the cathode tank 4 can quickly drain the original electrolyte to avoid mixing of the original electrolyte with the new electrolyte.

[0036] Optionally, the electrolyte contains a persulfate oxidant, such as sodium persulfate, and the electrolyte is a conventional electrolyte, such as a nitrate solution; adding manganese sand to the sediment to be treated can activate the persulfate oxidant.

[0037] Persulfate is a traditional oxidant used to treat antibiotics in sediments, and the present invention creatively uses an electric drive method to activate persulfate, promote the migration of the oxidant in the sediment, and improve the treatment efficiency of the antibiotics.

[0038] Optionally, the partition 5 is a double-layer plate, and each plate 7 is evenly provided with a number of through holes, and the through holes on the two plates 7 correspond to each other one by one. Filter paper is sandwiched between the two plates 7, which can fix the position of the filter paper and improve its strength, so that the electrolyte of the anode tank 2 and the cathode tank 4 can enter and exit the reaction tank 3 through the through holes and the filter paper, but prevents sediment from entering and exiting the reaction tank 3.

[0039] The present invention utilizes electric drive to improve the migration efficiency of the oxidant within the sediment. During experiments, the oxidant treatment efficiency needs to be analyzed and evaluated when the sediment is in different states. This requires simultaneous sampling of the liquid and sediment within the reaction tank 3. Accurate sampling of sediment at different locations and depths is particularly challenging. The present invention incorporates the separator 6, which is used to separate different areas within the reaction tank 3 during static experiments and to stir the sediment during dynamic experiments.

[0040] Optionally, the reaction tank 3 is square, and the partition frame 6 includes a plurality of meshes intersecting horizontally and vertically to form a plurality of square frames 8 arranged in an array, and the four top corners of each square frame 8 are rounded chamfers 9, so that when the partition frame 6 plays a stirring role, dead zones are avoided at the top corners of the square frame 8 to avoid accumulation of sediment;

[0041] The inner side walls of the square frame 8 are all vertical, which can evenly divide the internal space of the reaction tank 3 into several areas of equal volume, and the sediments in each area are not serially arranged.

[0042] Further optionally, at least one movable mesh wall 10 that can be opened and closed is provided on the inner side wall of the square frame 8. The movable mesh wall 10 is vertically arranged, and one side is hinged to the inner side wall of the square frame 8. The top side, bottom side and other side of the movable mesh wall 10 are not connected to the square frame 8, so that the movable mesh wall 10 can be rotated to open and close inside the square frame 8 to which it belongs;

[0043] When performing a static experiment, the movable mesh wall 10 is in close contact with the inner side wall of the square frame 8, and the angle between the two is zero. At this time, the side wall of the square frame 8 is a double-layer mesh, and the mesh holes of the movable mesh wall 10 are arranged in a staggered manner with the mesh holes of the inner side wall of the square frame 8, so that the mesh aperture formed by the double-layer mesh is smaller than the mesh aperture of the movable mesh wall 10 and also smaller than the mesh aperture of the inner side wall of the square frame 8;

[0044] When a dynamic experiment is performed, the movable mesh wall 10 rotates toward the inside of the square frame 8, and the angle between the two is greater than zero. When the partition frame 6 rotates, the side wall of the square frame 8 and the movable mesh wall 10 both play a stirring role.

[0045] Further optionally, the area of ​​the movable mesh wall 10 is equal to the area of ​​the inner side wall of the square frame 8 excluding the circular chamfers 9 on both sides.

[0046] Further optionally, the square frame 8 of the partition rack 6 closest to the four inner walls of the reaction tank 3 is detachable, that is, the square frame 8 on the outermost edge of the partition rack 6 itself is detachable. After disassembly, space is left between the partition rack 6 and the inner wall of the reaction tank 3, which facilitates the movement of the partition rack 6 during stirring.

[0047] During use, first place the sediment evenly in the reaction tank 3, and then put the partition frame 6 in from top to bottom until the bottom of the partition frame 6 contacts the bottom surface of the reaction tank 3, dividing the reaction tank 3 into several areas, and a static experiment can be carried out. At this time, the movable mesh wall 10 is close to the inner wall of the direction frame to form a smaller mesh; after the experiment, the partition frame 6 is lifted and pulled out, and placed in a clean water tank and shaken to complete the cleaning, which is simple and convenient; then the outermost circle of square frames 8 of the partition frame 6 is removed, and the movable mesh wall 10 of the inner wall of each square frame 8 is opened to form a suitable angle. After fixing the movable mesh wall 10, it is placed in the reaction tank 3, and the central position of the partition frame 6 is connected to the vertical rod, and the movement position of the partition frame 6 is manually or mechanically controlled by the vertical rod to stir the sediment in the reaction tank 3.

[0048] Optionally, the electrically driven experimental device includes a plurality of samplers 11 for sampling sediment and water in the reaction tank 3;

[0049] The sampler 11 is a sleeve structure, including an inner sleeve 12 and an outer sleeve 13. The top surfaces of the outer sleeve 13 and the inner sleeve 12 are open and the bottom surfaces are closed. The inner sleeve 12 can enter the interior of the outer sleeve 13; the outer wall of the outer sleeve 13 includes a sediment sampling part 14 and a liquid sampling part 15 from bottom to top. The sediment sampling part 14 is at the bottom of the outer sleeve 13, and the liquid sampling part 15 is evenly distributed with through holes, which are used to allow sediment samples and liquid samples to enter the interior of the outer sleeve 13 respectively; the side of the inner sleeve 12 is also evenly distributed with through holes.

[0050] Further optionally, the bottom of the sediment sampling portion 14 of the outer sleeve 13 is provided with a solid side wall 16 (i.e., of a certain height), for example, the height is 1 / 20-1 / 10 of the height of the outer sleeve 13, and above the solid side wall is a circle of hollow side walls 17, the hollow shape of which is a long strip, and the sediment can enter the interior of the outer sleeve 13 from the hollow part.

[0051] When conducting a static experiment, the sampler 11 is extended into a square frame 8 to sample sediments at different depths in the area. The outer side of the outer sleeve 13 is provided with scale lines. If the reaction tank 3 is made of transparent material, the depth of the outer sleeve 13 inserted into the sediment can be observed, and sediments at different heights can be obtained; the inner sleeve 12 is inserted into the outer sleeve 13, and the bottom surface of the inner sleeve 12 is close to the bottom surface of the outer sleeve 13. Filter paper is provided on the inner side wall of the inner sleeve 12 to prevent sediment from entering. The sampler 11 is inserted into the position and depth where sampling is required. The top ends of the inner sleeve 12 and the outer sleeve 13 are always above the liquid surface, and the through holes on the inner and outer sleeve side walls are staggered with each other at this time, and the water body does not enter the inner sleeve 12; the inner sleeve 12 is lifted upward so that the bottom surface of the inner sleeve 12 is higher than the hollow part of the sediment sampling part 14. At this time, a space with a certain negative pressure is formed between the bottom surfaces of the inner and outer sleeves 13, and the external sediment is negatively pressurized. Under the action of pressure, it enters the outer sleeve 13 through the hollow side wall 17. At this time, the through holes on the inner and outer sleeve side walls are still staggered with each other, and the water body does not enter the inner sleeve 12 in large quantities. The top of the handheld sampler 11 moves the sampler 11 horizontally in a small range to promote the sediment to enter the outer sleeve 13 from the hollow part; then, the inner sleeve 12 is moved downward so that the bottom surface of the inner sleeve 12 is lower than the part of the hollow side wall 17, and forms a closed space with the solid side wall 16 at the bottom of the sediment sampling part 14 for retaining the sediment sample. At this time, the through holes on the inner and outer sleeve side walls correspond one to one, and the water body can enter the inner sleeve 12. After the water body is stable, a syringe-type sampling needle is used to enter the inner sleeve 12 to take liquid samples at different heights; after taking the liquid sample, the sampler 11 is lifted out of the reaction tank 3, and the remaining liquid in the inner sleeve 12 is poured back into the reaction tank 3. The inner sleeve 12 is removed, and the sediment sample in the outer sleeve 13 is taken out to complete the sampling.

[0052] When conducting dynamic experiments, since the moving range of the partition frame 6 is not large, the maximum is the range of a square frame 8, sampling is still carried out according to the above method. It is only necessary to keep the sampler 11 moving in a small range during sampling and not touch the partition frame 6.

Claims

1. An electrically driven experimental device for treating antibiotics in sediments, characterized in that: The experimental tank includes an anode tank, a reaction tank, and a cathode tank. Sediments are placed in the reaction tank. Partitions are provided at both ends of the reaction tank to separate the reaction tank from the anode tank and the cathode tank. A plurality of through holes are evenly provided on the partitions to allow electrolytes in the anode tank and the cathode tank to flow in the reaction tank. The electrolytes contain an oxidant. An anode plate is provided in the anode tank, and a cathode plate is provided in the cathode tank. The anode plate and the cathode plate are connected to an external power supply to energize the experimental tank. The reaction tank is provided with a detachable partition frame, and the plurality of horizontal and vertical mesh sheets of the partition frame are arranged to form a plurality of frames, which divide the reaction tank into a plurality of areas, so as to facilitate sampling and analysis at different positions during static experiments; The partition frame can move in the reaction tank to promote the mixing of sediment and oxidant, making it easier to study the treatment effect of sediment during dynamic experiments; The reaction tank is square, and the partition frame includes a plurality of meshes intersecting horizontally and vertically to form a plurality of square frames arranged in an array. The four corners of each square frame are rounded chamfers, so that when the partition frame performs a stirring function, dead zones are avoided at the corners of the square frame to prevent sediment from accumulating. The inner side walls of the square frame are all vertical, which can evenly divide the internal space of the reaction tank into several areas of equal volume, and the sediments in each area are not serially connected; At least one movable mesh wall is provided on the inner side wall of the square frame. The movable mesh wall is vertically arranged, and one side is hinged to the inner side wall of the square frame so that the movable mesh wall can be rotated and opened and closed toward the inside of the square frame. When conducting a static experiment, the movable mesh wall is in close contact with the inner wall of the square frame, and the angle between the two is zero. At this time, the side wall of the square frame is a double-layer mesh, and the mesh holes of the movable mesh wall are arranged alternately with the mesh holes of the inner wall of the square frame, so that the mesh hole diameter formed by the double-layer mesh is smaller than the mesh hole diameter of the movable mesh wall and also smaller than the mesh hole diameter of the inner wall of the square frame; When the dynamic experiment is carried out, the movable mesh wall rotates toward the inside of the square frame, and the angle between the two is greater than zero. When the partition rotates, the side wall of the square frame and the movable mesh wall both play a stirring role. The electric drive experimental device includes several samplers for sampling sediment and water in the reaction tank; The sampler is a sleeve structure, including an inner sleeve and an outer sleeve. The top surfaces of the outer sleeve and the inner sleeve are open and the bottom surfaces are closed. The inner sleeve can enter the interior of the outer sleeve. The outer wall of the outer sleeve includes a sediment sampling portion and a liquid sampling portion from bottom to top. The sediment sampling portion is located at the bottom of the outer sleeve, and the liquid sampling portion is evenly and densely covered with through holes, which are used to allow sediment samples and liquid samples to enter the interior of the outer sleeve respectively. The side of the inner sleeve is also evenly and densely covered with through holes. The bottom of the sediment sampling portion of the outer sleeve is provided with a solid side wall, and the upper part of the solid side wall is a circle of hollow side walls, the hollow shape is a long strip, and the sediment can enter the inner part of the outer sleeve through the hollow part.

2. The electric drive experimental device according to claim 1, characterized in that: The area of ​​the movable mesh wall is equal to the area of ​​the inner side wall of the square frame excluding the circular chamfers on both sides.

3. The electric drive experimental device according to claim 2, characterized in that: The square frame of the partition frame closest to the four inner side walls of the reaction tank is detachable. After disassembly, space is left between the partition frame and the inner side walls of the reaction tank, which is convenient for the partition frame to move during stirring.

4. The electric drive experimental device according to claim 1, characterized in that: The anode tank is provided with a water inlet and a water outlet on the top or side surface, and the bottom is conical and provided with a vent. The container filled with electrolyte is connected to the water inlet of the anode tank through a delivery pump, and the water outlet of the anode tank is connected to the above container through a pipeline, forming a circulating electrolyte flow between the anode tank and the container filled with electrolyte; When the electrolyte needs to be replaced, the bottom of the anode tank can quickly drain the original electrolyte to avoid mixing of the original electrolyte and the new electrolyte; The structure of the cathode cell is the same as that of the anode cell.

5. The electric drive experimental device according to claim 1, characterized in that: The separator is a double-layer plate, each plate is evenly provided with a number of through holes, the through holes on the two plates correspond to each other, and filter paper is sandwiched between the two plates, which can fix the position of the filter paper and improve its strength, so that the electrolyte in the anode tank and the cathode tank can enter and exit the reaction tank through the through holes and the filter paper, but prevents sediment from entering and exiting the reaction tank.

6. The electric drive experimental device according to claim 1, characterized in that: The electrolyte contains a persulfate oxidant; adding manganese sand to the sediment to be treated can activate the persulfate oxidant.

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