Device for in-situ electric-phytoremediation of river and lake heavy metal polluted bottom mud

Abstract

The utility model belongs to the field, and discloses a device for in-situ electric-phytoremediation of river and lake heavy metal polluted bottom mud, which comprises a first remediation bracket, a second remediation bracket, a third remediation bracket and a fourth remediation bracket, and is characterized in that the first remediation bracket comprises two first vertical pipes, a first top pipe and a first bottom pipe which are connected between the two first vertical pipes; the first cathode electrode rod is arranged in the first top pipe in a penetrating manner; the first anode electrode rod is arranged in the first bottom pipe in a penetrating manner, and the second repairing bracket comprises two second vertical pipes, and a second top pipe and a second bottom pipe which are connected between the two second vertical pipes; the first repairing support and the second repairing support are made of insulating materials. The second cathode electrode rod is arranged in the second top pipe in a penetrating manner; the second anode electrode stem is arranged in the second bottom tube in a penetrating manner; the first anode electrode stem and the second anode electrode stem are connected with the positive electrode of a power supply through wires; the aquatic plant planting plate is arranged at the tops of the first repairing bracket and the second repairing bracket and used for heavy metal enrichment aquatic plants. The device is simple in structure and can effectively repair the river and lake heavy metal pollution bottom mud.

Description

In-situ electro-physical remediation device for heavy metal contaminated sediments in rivers and lakes Technical Field

[0001] This utility model relates to river and lake sediment remediation technology, and specifically to an in-situ electro-hydrodynamic-phytoremediation device for heavy metal-contaminated river and lake sediments. Background Technology

[0002] Bottom sediment is a crucial component of river and lake ecosystems, engaging in extensive material exchange with the overlying water. On one hand, various pollutants from the aquatic environment are deposited in the bottom sediment through complex interfacial exchanges and reactions such as adsorption, complexation, and sedimentation. When the rate of pollutant degradation is lower than the rate of sediment deposition, severe pollution of the bottom sediment occurs. On the other hand, when the aquatic environment changes, pollutants in the bottom sediment can be released back into the water, making the bottom sediment an endogenous source of aquatic pollution. Currently, endogenous pollution is one of the main sources of pollution in urban rivers and lakes. To effectively address river pollution, scientific management of river and lake bottom sediment is necessary.

[0003] Currently, there are two main methods for remediating pollutants in sediment, both domestically and internationally: in-situ remediation and ex-situ remediation. In-situ remediation refers to directly applying physical, chemical, and biological methods to adsorb, degrade, or solidify / stabilize pollutants in the sediment without dredging. Ex-situ fixation or treatment involves dredging the contaminated sediment and then treating it. In-situ treatment generally cannot fundamentally reduce the content of heavy metal pollutants in sediment and may cause significant damage to the aquatic environment. Ex-situ remediation methods have a significant impact on aquatic ecosystems, exacerbating the release of pollutants from the sediment in the short term, and the dredged sediment also poses problems of land occupation and secondary pollution. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the deficiencies and defects mentioned in the background art above, and to provide a device for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes that is simple in structure and can effectively remediate heavy metal-contaminated sediment in rivers and lakes.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is: an in-situ electro-phytoremediation device for heavy metal polluted sediment in rivers and lakes, comprising: a first remediation support, including two first risers and a first top pipe and a first bottom pipe connected between the two first risers;

[0006] The first cathode electrode rod is inserted inside the first jacking tube;

[0007] The first anode electrode rod is inserted into the first bottom tube;

[0008] Multiple through holes are opened in the walls of the first jacking pipe and the first bottom pipe;

[0009] The second repair support includes two second risers and a second top pipe and a second bottom pipe connected between the two second risers; the first repair support and the second repair support are made of insulating material.

[0010] The second cathode electrode rod is inserted inside the second jacking pipe;

[0011] The second anode electrode rod is inserted into the second bottom tube;

[0012] Multiple through holes are opened in the walls of the second jacking pipe and the second bottom pipe;

[0013] The first anode electrode rod and the second anode electrode rod are connected to the positive terminal of the power supply via a wire; the first cathode electrode rod and the second cathode electrode rod are connected to the negative terminal of the power supply via a wire.

[0014] An aquatic plant planting tray, placed on top of the first and second restoration supports, is used to plant aquatic plants that accumulate heavy metals.

[0015] In one embodiment, both the first riser and the second riser are telescopic pipes with adjustable lengths, and the bottoms of the first riser and the second riser are pointed.

[0016] In one embodiment, the first riser and the second riser are flat-mouthed pipes, and the bottoms of the first bottom pipe and the second bottom pipe form acute-angled tips.

[0017] In one embodiment, the bottom cross-sectional shape of the first bottom tube and the second bottom tube is an acute-angled isosceles triangle.

[0018] In one embodiment, the aquatic plant planting tray is square, and the four corners of the aquatic plant planting tray are detachably connected to two first risers and two second risers, respectively.

[0019] Compared with existing technologies, the beneficial effects of this utility model are as follows: The in-situ electrodynamic-phytoremediation device for heavy metal-contaminated sediments in rivers and lakes combines phytoremediation technology with electrodynamic remediation of heavy metal pollution in sediments. A first and second remediation support are inserted into the heavy metal-contaminated sediment, with two sets of anode and cathode electrodes respectively positioned within these supports. Both sets of electrodes are horizontally positioned within the heavy metal-contaminated sediment, providing a remediation electric field. This electric field can be controlled within the sediment layer, reducing the impact of overlying water on the remediation process. The anode is located in the lower sediment layer; electrolysis reduces sediment near the anode, facilitating the dissolution of heavy metals from the sediment. These metals then migrate to the shallower sediment layer through the electric field, allowing for absorption by aquatic plants in the planting tray. The low-voltage electric field promotes plant growth and facilitates the diffusion and transport of pollutants, overcoming the drawbacks of long phytoremediation cycles and limited remediation scope to the rhizosphere. It also mitigates the destructive effects of the electrodynamic process on soil structure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 is a schematic diagram of the device structure for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes according to one embodiment.

[0022] Figure 2 is a plan view of the device remediation status of an in-situ electrodynamic-phytoremediation method for heavy metal contaminated sediment in rivers and lakes according to one embodiment.

[0023] Figure 3 is a schematic diagram of the second remediation support structure of an in-situ electrodynamic-phytoremediation device for heavy metal contaminated sediments in rivers and lakes according to one embodiment.

[0024] Reference numerals: 1: First repair support, 2: Second repair support, 3: First cathode electrode rod, 4: First anode electrode rod, 5: Second cathode electrode rod, 6: Second anode electrode rod, 7: Wire, 8: Power supply, 9: Aquatic plant planting tray, 11: First riser, 12: First jacking pipe, 13: First bottom pipe, 21: Second riser, 22: Second jacking pipe, 23: Second bottom pipe. Detailed Implementation

[0025] To facilitate understanding of this utility model, the following description will be provided in more comprehensive and detailed manner with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0026] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0027] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0028] Please refer to Figures 1-3. The device for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes according to one embodiment mainly includes a first remediation support 1, a second remediation support 2, a first cathode electrode rod 3, a first anode electrode rod 4, a second cathode electrode rod 5, a second anode electrode rod 6, a wire 7, a power supply 8, and an aquatic plant planting tray 9.

[0029] Specifically, in one embodiment, the first repair support 1 and the second repair support 2 are square frame structures formed by connecting hollow tubes of rigid insulating material. Specifically, the first repair support 1 includes two first risers 11 and a first top tube 12 and a first bottom tube 13 connected between the two first risers 11 with multiple through holes in their tube walls. The second repair support 2 includes two second risers 21 and a second top tube 22 and a second bottom tube 23 connected between the two second risers 21 with multiple through holes in their tube walls. Preferably, the bottoms of the first risers 11 and the second risers 21 are pointed, facilitating insertion into river and lake heavy metal contaminated sediment. More preferably, the first risers 11 and the second risers 21 are adjustable-length telescopic tubes, allowing for adjustment of the required length according to the depth of the river and lake heavy metal contaminated sediment, adapting to sediments of different depths.

[0030] Preferably, the bottom cross-sections of the first bottom tube 13 and the second bottom tube 23 are acute-angled isosceles triangles. The overall structure can be a triangular prism or a pentagon. Specifically, regardless of the shape of the first bottom tube 13 and the second bottom tube 23, they are each provided with through holes for the first anode electrode rod and the second anode electrode rod to pass through.

[0031] Specifically, the first cathode electrode rod 3 is inserted into the first top tube 12; the first anode electrode rod 4 is inserted into the first bottom tube 13. The second cathode electrode rod 5 is inserted into the second top tube 22; the second anode electrode rod 6 is inserted into the second bottom tube 23; the first anode electrode rod 4 and the second anode electrode rod 6 are connected to the positive terminal of the power supply 8 via a wire 7; the first cathode electrode rod 3 and the second cathode electrode rod 5 are connected to the negative terminal of the power supply 8 via a wire 7.

[0032] Specifically, the aquatic plant planting tray 9 is topped with the first repair support 1 and the second repair support 2 for planting aquatic plants that accumulate heavy metals. Preferably, the aquatic plant planting tray 9 is square, with its four corners detachably connected to two first risers 11 and two second risers 21, for example, by riveting or threading. During transportation or storage, the aquatic plant planting tray 9 can be disassembled, and the first repair support 1 and the second repair support 2 can be stacked together, reducing space occupation.

[0033] The method of using a device for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes is as follows:

[0034] (1) Adjust the lengths of the first riser 11 and the second riser 21 of the first remediation support 1 and the second remediation support 2 according to the heavy metal pollution of the river and lake sediment. Insert the first cathode electrode rod 3 into the first top pipe 12, the first anode electrode rod 4 into the first bottom pipe 13, and the second cathode electrode rod 5 into the second top pipe 22; insert the second anode electrode rod 6 into the second bottom pipe 23. Fix the aquatic plant planting tray 9 to the top of the first remediation support 1 and the second remediation support 2.

[0035] (2) Insert the first repair bracket 1 and the second repair bracket 2 vertically into the bottom mud of the repair area, with the top of the repair bracket located at the interface between the bottom mud and the overlying water.

[0036] (3) Plant submerged or emergent plants according to the depth of water covering the bottom sediment and the type of heavy metal.

[0037] (4) Connect the first anode electrode rod 4 and the second anode electrode rod 6 to the positive terminal of the power supply 8 through the wire 7; connect the first cathode electrode rod 3 and the second cathode electrode rod 5 to the negative terminal of the power supply 8 through the wire 7. Turn on the power switch to start the repair.

[0038] (5) After the remediation is completed, remove the in-situ electro-phytoremediation device for heavy metal contaminated sediment in rivers and lakes.

[0039] The above are merely preferred embodiments of this utility model. It should be noted that this utility model is not limited to the above embodiments. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A device for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes, characterized in that, include: The first repair support includes two first risers and a first top pipe and a first bottom pipe connected between the two risers. Multiple through holes are formed in the walls of the first top pipe and the first bottom pipe. A first cathode electrode rod is inserted inside the first top pipe. A first anode electrode rod is inserted inside the first bottom pipe. The second repair support includes two second risers and a second top pipe and a second bottom pipe connected between the two risers. Multiple through holes are formed in the walls of the second top pipe and the second bottom pipe. The first and second repair supports are made of insulating material. A second cathode electrode rod is inserted inside the second top pipe. A second anode electrode rod is inserted inside the second bottom pipe. The first and second anode electrode rods are connected to the positive terminal of a power source via wires. The first and second cathode electrode rods are connected to the negative terminal of a power source via wires. An aquatic plant planting tray is placed on top of the first and second repair supports for planting aquatic plants that accumulate heavy metals.

2. The device for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes according to claim 1, characterized in that, Both the first and second risers are telescopic pipes with adjustable lengths, and the bottoms of the first and second risers are pointed.

3. The device for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes according to claim 1, characterized in that, The first and second risers are flat-mouthed pipes, and the bottoms of the first and second bottom pipes form acute-angled tips.

4. The device for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes according to claim 3, characterized in that, The bottom cross-sections of the first and second bottom tubes are acute-angled isosceles triangles.

5. The device for in-situ electrodynamic-phytoremediation of heavy metal-contaminated sediment in rivers and lakes according to claim 1, characterized in that, The aquatic plant planting tray is square, and its four corners are detachably connected to two first risers and two second risers, respectively.

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