River and lake bottom mud in-situ remediation device

Abstract

The utility model belongs to the technical field of river and lake bottom mud repair, and discloses a river and lake bottom mud in-situ repair device which comprises an insulation protection cover, a bottom plate, a bottom plate and a bottom plate, an overflow pipe; the insulating protective cover penetrates through the top of the insulating protective cover and comprises an inner pipe and an outer pipe which are detachably connected, and the inner pipe is filled with a material capable of adsorbing or degrading pollutants; the repairing material box is fixed on the inner side surface of the insulating protective cover and is used for containing a repairing material for adsorbing or degrading pollutants; the two electrode protection sleeves are fixed in the insulating protection cover and are respectively connected with an electrolyte supply device; the anode electrode stem is arranged in one electrode protection sleeve; the cathode electrode stem is arranged in the other electrode protection sleeve; and the anode electrode stem and the cathode electrode stem are respectively connected with a power supply through wires. The river and lake bottom mud in-situ remediation device can efficiently complete river and lake bottom mud remediation treatment, and is simple in structure and convenient to operate.

Description

Technical Field

[0001] This utility model relates to the field of river and lake bottom sediment remediation technology, and in particular to an in-situ remediation device for river and lake bottom sediment. Background Technology

[0002] Bottom sediments are deposits in rivers and lakes, and are an important component of aquatic ecosystems such as rivers and lakes. With the rapid development of my country's economy, various pollutants enter the aquatic environment through atmospheric deposition, wastewater discharge, soil erosion, and rainfall. These pollutants, once in the aquatic environment, are deposited in the bottom sediments through complex interfacial exchanges and reactions such as adsorption, complexation, and precipitation, causing serious pollution. When the aquatic environment changes, pollutants in the bottom sediments are likely to be released into the aquatic environment, causing secondary pollution, deteriorating water quality, posing drinking water safety problems, or directly or indirectly affecting human health through the food chain. River and lake bottom sediment pollution has become a significant environmental problem in my country.

[0003] Currently, sediment remediation technologies mainly include physical, chemical, and biological methods, or a combination of these methods. However, the aquatic environment in which sediments are located is extremely complex, and both chemical and ecological remediation have significant limitations. Chemical remediation cannot fundamentally reduce heavy metal pollutants in sediments and causes significant damage to the aquatic environment; while ecological remediation has a long cycle and also faces the problem of aquatic plant treatment. The environmental dredging process of river and lake sediments causes significant damage to aquatic plant systems, resulting in a short-term increase in nitrogen and phosphorus release, and the amount of dredged sediment generated is very large. Currently, sediment dredging occupies a large amount of idle land, leading to secondary pollution.

[0004] Electrodynamic remediation technology is an emerging in-situ remediation technology for soil and groundwater that has emerged internationally in the last 30 years. It has attracted widespread attention due to its advantages, such as the complete removal of contaminants from sediment and relatively short remediation time. Currently, some patents propose using electrodynamic remediation methods for in-situ remediation of sediment. Chinese patent CN208234729U discloses an in-situ remediation device for heavy metal-contaminated river and lake sediment. This device uses an electrically driven drainage system to remove contaminants from the sediment and then uses a steel plate mold to fix and insert it into the sediment to prevent untreated sediment from entering the remediation area. This patent is not applicable to situations where there is overlying water treatment.

[0005] Chinese patent CN112979114A discloses an in-situ electrically powered treatment device and method for bottom sediment in water bodies. It employs a polygonal anode arrangement with a single cathode to form a uniform electric field, coupled with the efficient adsorption of modified carbon to remove heavy metals from the sediment. The patent mentions using a water-resistant curtain to enclose a closed tetrahedral shape above the remediation area, and pumping out the water from the tetrahedral space before remediation. This overlying water treatment method is complex and costly. Chinese patent CN107746163A discloses an in-situ reduction and removal device for polluted river and lake sediment based on pore water drainage, including a DC regulated power supply, a peristaltic pump, and electrically powered dewatering and decontamination electrodes. Two electrically powered dewatering and decontamination electrodes are inserted into the sediment in a parallel arrangement. Each electrode includes a water-conducting electrode plate, perforated plexiglass plates on both sides of the water-conducting electrode plate, a filter screen on the outside of the perforated plexiglass plates, and an overlying water-resistant cover over the water-conducting electrode plate. The water-guiding electrode plate has vertical water-guiding grooves and metal wires connected to a DC regulated power supply. A pore water storage device, connected to the water-guiding grooves, is located at the bottom of the electrode plate. The pore water storage device is connected to a pore water discharge conduit, which in turn is connected to a peristaltic pump. This patent, by centrally storing and discharging pore water containing high concentrations of pollutants, cannot achieve in-situ treatment of polluted river and lake sediment in a single process. Utility Model Content

[0006] 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 an in-situ remediation device for river and lake bottom sediment that can efficiently complete the remediation treatment of river and lake bottom sediment and has a simple structure and is easy to operate.

[0007] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is: an in-situ remediation device for river and lake bottom sediment, comprising: an insulating protective cover with an opening at the bottom, and a force transmission rod fixed to the top of the insulating protective cover;

[0008] Overflow pipe; installed on the top of an insulating protective cover, including a detachably connected inner pipe and an outer pipe, wherein the inner pipe is filled with water treatment material that can absorb or degrade pollutants, and the inner pipe is a perforated pipe;

[0009] The repair material box, fixed to the inside of the insulating protective cover, is used to hold repair materials that adsorb or degrade pollutants.

[0010] Two electrode protective sleeves are fixed inside an insulating protective cover, and each of the two electrode protective sleeves is connected to an electrolyte supply device.

[0011] The anode electrode rod is housed within one of the electrode protective sleeves;

[0012] The cathode electrode rod is housed inside another electrode protective sleeve;

[0013] The anode electrode rod and the cathode electrode rod are respectively connected to the power supply via wires.

[0014] In one embodiment, the insulating protective cover is a cuboid frame structure, including a top plate and two oppositely arranged long side plates and two oppositely arranged short side plates. The force transmission rod is fixed at the center of the top plate, and overflow pipe openings are provided at both ends of the top plate for connecting overflow pipes.

[0015] In one embodiment, the repair material box includes a receiving portion and an insertion portion disposed at the bottom of the receiving portion, the insertion portion forming a pointed tip, a small door that can be opened and closed is provided on the side wall of the receiving portion for taking out and putting in repair materials, a first longitudinal groove is provided on the long side plate, and the repair material box is fixed on the first longitudinal groove.

[0016] In one embodiment, the electrode protective sleeve is a wedge-shaped body for insertion into the bottom mud of rivers and lakes. The two short side plates are provided with a second longitudinal groove, and the two electrode protective sleeves are respectively fixed on the two second longitudinal grooves.

[0017] In one embodiment, the force transmission rod is a telescopic rod.

[0018] In one embodiment, the outer tube includes a short threaded connecting tube and a long threaded connecting tube, and the inner tube is sleeved inside the short threaded connecting tube.

[0019] In one embodiment, the electrolyte supply device includes an electrolyte storage tank, an electrolyte outlet pipe, and a delivery pump. One end of the electrolyte outlet pipe is connected to an electrode protective sleeve, and the other end is connected to the electrolyte storage tank. The delivery pump is mounted on the electrolyte outlet pipe.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: In the above-mentioned in-situ remediation device for river and lake bottom sediment, the setting of the insulating protective cover can effectively reduce the suspension of bottom sediment caused by the remediation operation, and further control the electric field distribution range, isolate the bottom sediment from the water above, so that the electric field is inside the insulating protective cover, reduce the remediation energy consumption, improve the remediation efficiency, and achieve a remediation rate of over 70%. An overflow pipe is installed on the insulating protective cover. The overflow pipe includes a detachably connected inner pipe and an outer pipe. The inner pipe is filled with water treatment material that can adsorb or degrade pollutants. When the in-situ remediation device for river and lake sediment is placed in the river and lake sediment that needs to be treated, the outer pipe is first disassembled and the entire system is lowered before powering on. The gas inside the insulating protective cover is discharged through the overflow pipe to prevent the insulating protective cover from tipping over. When the in-situ remediation device for river and lake sediment is fixed in the river and lake sediment, electrolyte is injected into the two electrode protective sleeves, and the outer pipe of the overflow pipe is connected and tightened. The waste liquid generated by electrolytic remediation is discharged after being treated by the pollutant-adsorbing or degrading material in the overflow pipe to avoid secondary pollution of the overlying water body. Attached Figure Description

[0021] 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.

[0022] Figure 1 A schematic diagram of an in-situ remediation device for river and lake bottom sediments according to one embodiment;

[0023] Figure 2 An insulation top view of an in-situ remediation device for river and lake bottom sediment according to one embodiment;

[0024] Figure 3 A schematic diagram of the insulating protective cover of an in-situ remediation device for river and lake sediments according to one embodiment (view from below the bottom opening);

[0025] Figure 4 A top view of a partial structure of an in-situ remediation device for river and lake sediments according to one embodiment;

[0026] Figure 5 A schematic diagram of the repair material box structure of an in-situ remediation device for river and lake bottom sediments according to one embodiment;

[0027] Figure 6 A schematic diagram of the electrode protective sleeve structure of an in-situ remediation device for river and lake sediments according to one embodiment;

[0028] Figure 7 This is a schematic diagram of the overflow pipe structure of an in-situ remediation device for river and lake bottom sediments, as one embodiment.

[0029] Attached reference numerals: 1: Insulating protective cover; 2: Force transmission rod; 3: Overflow pipe; 4: Repair material box; 5: Electrode protective sleeve; 6: Anode electrode rod; 7: Cathode electrode rod; 8: Wire; 9: Power supply; 10: Electrolyte storage tank; 11: Infusion pump; 12: Electrolyte outlet pipe; 1-1: Top plate; 1-2: Short side plate; 1-3: Long side plate; 1-4: Overflow pipe opening; 1-5: Wire opening; 1-6: Electrode liquid outlet pipe opening; 1-7: Longitudinal groove; 3-1: Inner pipe; 3-2: Short threaded connecting pipe; 3-4: Water treatment material; 4-1: Pentagonal side plate; 4-2: Rectangular side plate; 4-3: Rectangular top plate; 4-4: Repair material; 4-5: Small door. Detailed Implementation

[0030] To make the above and other features and advantages of this utility model clearer, the utility model will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art, and are exemplary only, not restrictive.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Please see Figure 1-7 One embodiment of the in-situ remediation device for river and lake bottom sediment mainly includes an insulating protective cover 1, a force transmission rod 2, an overflow pipe 3, a remediation material box 4, an electrode protective sleeve 5, an anode electrode rod 6, a cathode electrode rod 7, a wire 8, a power supply 9, an electrolyte storage tank 10, a delivery pump 11, and an electrolyte outlet pipe 12.

[0037] Specifically, in one embodiment, the insulating protective cover 1 is a bottomless cuboid frame structure made of rigid insulating material, with an opening at the bottom. In this embodiment, it is assembled from a top plate 1-1 and two short side plates 1-2 and two long side plates 1-3 connected to the bottom of the top plate 1. A force transmission rod 2 is fixedly connected to the center of the top plate 1-1, and overflow pipe openings 1-4 are opened near both ends of the top plate 1-1 to connect two overflow pipes 3, two wire openings 1-5 for wires 8 to pass through, and two electrode liquid outlet pipe openings 1-6 for electrolyte outlet pipes 12 to pass through. The short side plates 1-2 and long side plates 1-3 are of equal height, and their height is slightly greater than the depth of the repaired bottom mud.

[0038] Preferably, the inner sides of the short side plate 1-2 and the long side plate 1-3 are provided with longitudinal slide grooves 1-7 with limiting devices. The electrode protective sleeve 5 and the repair material box 4 are respectively fixed on the longitudinal slide groove 1-7. More specifically, the longitudinal slide groove 1-7 includes a first longitudinal slide groove provided on the long side plate 1-3, and the repair material box 4 is fixed on the first longitudinal slide groove. The longitudinal slide groove 1-7 also includes a second longitudinal slide groove provided on the two short side plates 1-2, and the two electrode protective sleeves are respectively fixed on the two second longitudinal slide grooves.

[0039] Preferably, in one embodiment, the force transmission rod 2 is composed of a telescopic rod, the longest length of which is not shorter than the water depth over the repair area. The force transmission rod 2 is telescopic for easy storage. Of course, if storage space is not a concern, the force transmission rod can also be a non-telescopic rod, as long as it provides a downward or upward pull-up insulating protective cover 1.

[0040] Preferably, in one embodiment, the overflow pipe 3 includes an inner pipe 3-1 and an outer pipe. The inner pipe 3-1 is a perforated pipe; the outer pipe consists of a short threaded connector 3-2 and a long threaded connector that can be joined together. The inner pipe 3-1 is slightly longer than the short threaded connector 3-2 of the outer pipe. When connected, the outer wall of the inner pipe 3-1 is tightly against the inner wall of the short threaded connector 3-2. The inner pipe 3-1 is filled with a water treatment material 3-4 that can adsorb or degrade pollutants and / or adjust the pH of the water.

[0041] Preferably, in one embodiment, the remediation material box 4 includes a receiving portion and an insertion portion disposed at the bottom of the receiving portion, the insertion portion forming a pointed tip, and a small door for retrieving and placing the remediation material is provided on the side wall of the receiving portion. Specifically, in this embodiment, the receiving portion of the remediation material box 4 is formed by splicing two symmetrically arranged pentagonal side plates 4-1, two symmetrically arranged rectangular side plates 4-2, and a rectangular top plate 4-3. The insertion portion is formed by butt-jointing two identical rectangular side plates 4-2 connected to the bottom of the rectangular side plates 4-2 to form a pointed tip. The pentagonal side plates 4-1, rectangular side plates 4-2, and rectangular top plate 4-3 are made of perforated insulating board. The rectangular side plates 4-2 are provided with an openable small door 4-5 for removing and filling the remediation material 4-4. The remediation material 4-4 filled in the remediation material box 4 should be selected according to the type of sediment pollution, and can be an environmentally friendly functional material with heavy metal adsorption, heavy metal precipitation, or organic pollutant oxidative degradation effects.

[0042] Specifically, in one embodiment, the electrode protective sleeve 5 is wedge-shaped and used for insertion into the river or lake bottom sediment. Two electrode protective sleeves 5 are respectively fixed to two second longitudinal sliding grooves. Specifically, in one embodiment, the electrode protective sleeve 5 is composed of two triangular side plates, two rectangular connecting side plates, and a rectangular connecting top plate spliced ​​together. The electrode protective sleeve 5 is made of insulating board.

[0043] Specifically, in one embodiment, the electrolyte stored in the electrolyte storage tank 10 is delivered to the electrode protective sleeve 5 by the infusion pump 11 through the electrolyte outlet pipe 12.

[0044] The usage method of the above-mentioned in-situ remediation device for river and lake bottom sediment is as follows:

[0045] S10. Determine the height of the insulating protective cover 1 according to the depth of the bottom sediment, adjust the length of the force transmission rod 2 according to the depth of the overlying water, load the water treatment material 3-4 of the type determined according to the type of pollutant into the inner tube 3-1 of the overflow pipe 3, and fill the repair material 4-4 of the type determined according to the type of pollutant into the repair material box 4 through the small door 4-5.

[0046] S20. Remove the long threaded connector on the outer layer of the overflow pipe 3, and slowly insert the device horizontally into the repair mud through the force transmission rod 2. The upper surface of the insulating protective cover 1 is flush with the mud-water interface of the repair area.

[0047] S30. The electrolyte stored in the electrolyte storage tank 10 is delivered to the electrode protective sleeve by the infusion pump 11 through the matching electrolyte outlet pipe 12.

[0048] S40. Connect the long threaded connector of the outer tube of the overflow pipe 3 to the short threaded connector 3-2 and tighten them.

[0049] (5) Connect wire 8 to power supply 9, start the power supply for repair, power on for a period of time to complete the repair, turn off power supply 9, and slowly move the in-situ repair device of river and lake bottom sediment out of the repaired bottom sediment through force transmission rod 2.

[0050] In the aforementioned in-situ remediation device for river and lake sediments, the use of an insulating protective cover 1 effectively reduces sediment suspension caused by the remediation operation and further controls the electric field distribution range, isolating the sediment from the water above. This keeps the electric field within the insulating protective cover, reducing remediation energy consumption and improving remediation efficiency. Before remediation, the total cadmium content of a certain contaminated sediment was 5.7 mg / kg, and after remediation, it was 1.7 mg / kg, achieving a remediation rate of over 70%. An overflow pipe 3 is installed on the insulating protective cover 1. The overflow pipe includes a detachably connected inner pipe 3-1 and an outer pipe. The inner pipe 3-1 is filled with water treatment material 3-4 that can adsorb or degrade pollutants and / or adjust the pH of the water. When the in-situ remediation device for river and lake sediment is placed in the river and lake sediment that needs to be treated, the outer pipe is first disassembled and the entire device is lowered before the power is turned on. The gas in the insulating protective cover 1 is discharged through the inner pipe of the overflow pipe 3 to prevent the insulating protective cover from tipping over. When the in-situ remediation device for river and lake sediment is fixed in the river and lake sediment, electrolyte is injected into the two electrode protective sleeves 5 and the outer pipe of the overflow pipe 3 is connected. The waste liquid generated by electrolytic remediation is discharged after being treated by the pollutant-adsorbing or degrading material in the overflow pipe to avoid secondary pollution of the overlying water.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for in-situ remediation of river and lake bottom sediment, characterized in that, include: An insulating protective cover has an opening at the bottom, and a force transmission rod is fixed to the top of the insulating protective cover; Overflow pipe; It is installed on the top of the insulating protective cover and includes a detachably connected inner tube and an outer tube. The inner tube is filled with water treatment material that can adsorb or degrade pollutants. The inner tube is a perforated tube. The repair material box, fixed to the inside of the insulating protective cover, is used to hold repair materials that adsorb or degrade pollutants. Two electrode protective sleeves are fixed inside an insulating protective cover, and each of the two electrode protective sleeves is connected to an electrolyte supply device. The anode electrode rod is housed within one of the electrode protective sleeves; The cathode electrode rod is housed inside another electrode protective sleeve; The anode electrode rod and the cathode electrode rod are respectively connected to the power supply via wires.

2. The river and lake sediment in-situ remediation device according to claim 1, characterized in that, The insulating protective cover is a cuboid frame structure, including a top plate, two long side plates and two short side plates arranged opposite each other. The force transmission rod is fixed at the center of the top plate, and overflow pipe openings are opened at both ends of the top plate for connecting overflow pipes.

3. The river and lake sediment in-situ remediation device according to claim 2, characterized in that, The repair material box includes a receiving part and an insertion part disposed at the bottom of the receiving part. The insertion part forms a pointed tip. The side wall of the receiving part is provided with an openable door for taking out and putting in the repair material. The long side plate is provided with a first longitudinal groove, and the repair material box is fixed on the first longitudinal groove.

4. The river and lake sediment in-situ remediation device according to claim 2, characterized in that, The electrode protective sleeve is wedge-shaped and is used to insert into the bottom mud of rivers and lakes. The two short side plates are provided with a second longitudinal groove, and the two electrode protective sleeves are respectively fixed on the two second longitudinal grooves.

5. The in-situ remediation device for river and lake bottom sediments according to claim 1, characterized in that, The force transmission rod is a telescopic rod.

6. The in-situ river and lake sediment remediation device according to claim 1, characterized in that, The outer tube includes a short threaded connecting tube and a long threaded connecting tube, and the inner tube is sleeved inside the short threaded connecting tube.

7. The in-situ river and lake sediment remediation device according to claim 1, characterized in that, The electrolyte supply device includes an electrolyte storage tank, an electrolyte outlet pipe, and a delivery pump. One end of the electrolyte outlet pipe is connected to the electrode protective sleeve, and the other end is connected to the electrolyte storage tank. The delivery pump is installed on the electrolyte outlet pipe.

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