Dredged sludge treatment system and method combining solar heating, leaching, vacuum preloading

Abstract

This invention relates to a solar-heated, rinsing, and vacuum pre-compression combined system and method for treating dredged sludge. The invention utilizes a plastic drainage board with an internally encapsulated electrothermal film as a channel for rinsing injection and consolidation drainage. Rinsing liquid is pumped into the sludge through the plastic drainage board, adsorbing heavy metal ions and decomposing organic pollutants. After rinsing, vacuum pre-compression consolidation drainage is performed. Compared with existing technologies, the solar-heated, rinsing, and vacuum pre-compression combined system for treating dredged sludge provided by this invention can simultaneously meet the engineering requirements of pollutant treatment and sludge solidification, shortening the treatment cycle and saving construction costs. Furthermore, the introduction of a solar energy device provides clean energy to the system. The electrothermal film in the drainage board heats the surrounding soil, accelerating pollutant decomposition, improving drainage efficiency, further optimizing the treatment effect, and the electrothermal film in the plastic drainage board can be recycled after construction, achieving sustainable resource utilization.

Description

Technical Field

[0001] This invention relates to the field of dredged sludge treatment and consolidation technology, and more specifically to a dredged sludge treatment system and method that combines solar heating, rinsing, and vacuum pre-compression. Background Technology

[0002] With the accelerating pace of urbanization, large amounts of industrial and domestic wastewater are discharged directly into waterways without treatment, leading to a sharp deterioration in the ecological quality of aquatic bodies. To improve the aquatic environment, enhance navigation capacity, and strengthen water security, large-scale river and lake dredging projects are required annually, such as the deep-water channel improvement project at the Yangtze River estuary. Dredged silt accumulates a large number of pollutants, primarily heavy metals such as lead, cadmium, chromium, and mercury, as well as organic pollutants such as polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs), seriously threatening the environment and human health.

[0003] Currently, a commonly used method for dredged sludge remediation involves adding large amounts of adsorbents and complexing agents, such as activated carbon solution, ferric chloride solution, and calcium hydroxide solution, to the sludge. The sludge is then thoroughly stirred on-site to ensure a complete reaction with the agents, thereby adsorbing heavy metal ions and degrading organic pollutants. Subsequently, drainage boards are inserted into the sludge, and the sludge is consolidated through surcharge preloading or vacuum preloading. This method has the advantage of simple construction technology and a mature operating system, but it still faces several challenges. For example, when dealing with large areas of sludge, how to ensure uniform mixing with adsorbents, remove adsorbed precipitates, and accelerate soil consolidation to shorten the temporary land acquisition time are all challenges.

[0004] Therefore, how to provide an improved system and method for the treatment and rapid consolidation of dredged sludge is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] Therefore, one objective of this invention is to propose a combined solar heating, rinsing, and vacuum pre-compression dredging sludge treatment system to overcome the shortcomings of existing dredging technologies in the background art.

[0006] Another objective of this invention is to propose a method for treating dredged sludge that combines solar heating, rinsing, and vacuum pre-compression.

[0007] The technical solution provided by this invention is: a dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression, comprising:

[0008] A drainage board, wherein an electrothermal film is encapsulated along its internal length and inserted into the sludge for heating the sludge, and includes a cross-array arrangement of injection drainage boards and extraction drainage boards.

[0009] A sealing membrane is laid on the surface of the soil to create a sealed environment.

[0010] A plurality of connecting pipes are sealed to the top of the sealing membrane, and each connecting pipe is sealed to its corresponding drainage plate.

[0011] The injection pump, and the connecting pipe corresponding to the injection drainage plate are connected to the reagent pool through the injection pump;

[0012] A vacuum pump is provided, and the connecting pipe corresponding to the liquid drainage plate is connected to the waste liquid tank through the vacuum pump.

[0013] A solar energy device, which is mounted above the sealing film and electrically connected to the electrothermal film.

[0014] Furthermore, the injection drainage plate is used as the pumping drainage plate during the pumping operation and is connected to the vacuum pump and the waste liquid tank.

[0015] Furthermore, the drainage board is a plastic drainage board, which includes a core board, an outer filter membrane, and the electrothermal membrane. The electrothermal membrane is encapsulated inside the core board, and the core board is wrapped by the outer filter membrane.

[0016] Furthermore, the heating film is heated by a metal busbar wrapped between two insulating films, and the busbar is electrically connected to the solar energy device; the insulating film is a polyester insulating film.

[0017] Furthermore, the core board is made of a high-strength, corrosion-resistant, high-temperature-resistant, and highly insulating material.

[0018] Furthermore, the sealing membrane comprises a woven fabric and a geomembrane laid from bottom to top on the soil surface, with the edges of the geomembrane embedded in the sealing trench.

[0019] Furthermore, the connecting pipe is a PVC pipe, and the geomembrane at the connection point with the drainage board is sealed.

[0020] Furthermore, the injection pump and vacuum pump can be optionally electrically connected to the solar energy device.

[0021] Furthermore, the solar energy device includes: a solar panel support frame, which is mounted above the sealing film and on which a solar panel is laid; the solar panel is electrically connected to a storage battery via wires, and the storage battery is connected to the waterproof conductive wire of the heating film via cables and a waterproof plug.

[0022] Another technical solution provided by this invention is: a dredged sludge treatment method combining solar heating, rinsing, and vacuum precompression, employing the aforementioned solar heating, rinsing, and vacuum precompression combined dredged sludge treatment system, with the specific steps as follows:

[0023] S1. Level the site for the dredged sludge, insert the drainage boards into the sludge soil to the specified depth using a bagged sand well installation machine, leave a predetermined exposed length, and arrange the drainage boards in a regular pattern at a certain distance, with the liquid injection drainage boards and the liquid extraction drainage boards distributed in a cross-array.

[0024] S2. After the drainage board is installed, use a multimeter to check the conductivity of the heating film in the drainage board in turn. If the inspection finds that the wire in the heating film is broken, the drainage board at the corresponding position must be reinstalled.

[0025] S3. Seal the interface between the drainage board and the connecting pipe with sealant; connect each drainage board to the battery; then lay a sealing membrane on the soil surface, burying the edges of the sealing membrane in the sealing trench to prevent air leakage;

[0026] S4. The connecting pipe on the liquid injection and drainage plate is connected to the chemical tank, and the washing agent is pumped into the sludge by the liquid injection pump. The connecting pipe on the liquid extraction and drainage plate is connected to the waste liquid tank, and the waste liquid is pumped into the waste liquid tank by the vacuum pump.

[0027] S5. Install solar panels so that the electricity they generate can be used to power all electrical facilities on site; turn on the power supply system to heat the electric heating film in the drainage board, use the drainage board to heat the sludge, and turn on the vacuum pump and liquid injection pump to wash the sludge.

[0028] S6. After rinsing, connect the injection drainage plate to the waste liquid tank; all drainage plates are used for vacuum pre-compression consolidation drainage; after consolidation, the electrothermal film in the drainage plate is recycled.

[0029] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a dredged sludge treatment system and method that combines solar heating, rinsing, and vacuum pre-compression. It constructs a dredged sludge treatment system that combines clean energy direct heating, rinsing, and vacuum pre-compression, integrating sludge removal and consolidation. This system can not only fully remove toxic and harmful substances from the sludge, but also effectively reduce the soil moisture content, greatly simplifying the construction process, while making full use of clean energy and reducing environmental pollution.

[0030] This invention employs rinsing technology to clean sludge, effectively removing heavy metal ions and various organic pollutants, thus greatly reducing the threat to the environment and human health. The rinsing agent is pumped into the soil through a drainage board, eliminating the need for additional pipelines. After rinsing, the drainage board can still drain and consolidate the soil normally. Based on the commonly used pre-compression drainage system in engineering, this invention simultaneously achieves two processes: sludge consolidation and pollutant treatment, integrating sludge removal and consolidation, and simplifying the construction process.

[0031] This invention utilizes solar power generation technology to provide electricity to the construction site, employing clean energy and actively responding to the call for promoting clean energy, effectively reducing environmental pollution. The invention heats the drainage board using solar panels, raising the soil temperature and providing a suitable reaction environment for the leachate and pollutants, promoting the decomposition of organic pollutants, accelerating drainage rate, shortening soil consolidation time, and further simplifying the structure, thus effectively reducing environmental pollution. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 The attached figure is a schematic diagram of the structure of the solar-heated rinsing and vacuum pre-compression combined dredging sludge treatment system provided by the present invention (the solar energy device is not shown, and it is also a schematic diagram of the liquid injection process).

[0034] Figure 2 The attached diagram illustrates an embodiment of the solar panel support.

[0035] Figure 3 The attached diagram illustrates an embodiment of the solar panel;

[0036] Figure 4 The attached diagram illustrates the drainage board;

[0037] Figure 5 The attached diagram illustrates the system's liquid extraction operation.

[0038] In the diagram: 1 is the liquid injection drainage plate, 2 is the liquid extraction drainage plate, 3 is the sealing membrane, 4 is the connecting pipe, 5 is the waste liquid pool, 6 is the reagent pool, 7 is the vacuum pump, 9 is the liquid injection pump, 10 is the solar panel bracket, 11 is the solar panel, 12 is the storage battery, 13 is the wire, 14 is the core board, 15 is the electric heating film, 16 is the outer filter membrane, 17 is the waterproof conductive wire, 18 is the waterproof plug, and 19 is the cable. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] The existing dredging sludge remediation methods commonly used involve adding large amounts of adsorbents and complexing agents, such as activated carbon solution, ferric chloride solution, and calcium hydroxide solution, to the sludge. The sludge is then thoroughly stirred on-site to ensure a complete reaction with the agents, thereby adsorbing heavy metal ions and degrading organic pollutants. Drainage boards are then inserted into the sludge, and the sludge is consolidated through sludge loading or vacuum preloading. However, this method suffers from low efficiency in uniform mixing with the adsorbent when dealing with large areas of sludge, slow discharge of adsorbed sediments and soil consolidation, and lengthy temporary land acquisition time.

[0043] Therefore, embodiments of the present invention disclose a combined solar-heated rinsing and vacuum pre-compression dredged sludge treatment system, see attached figure. Figure 1-5 The system includes: a drainage board, which encapsulates an electric heating film 15 along its internal length and is vertically inserted into the sludge for heating the sludge, and includes a cross-array arrangement of injection drainage boards 1 and extraction drainage boards 2; a sealing membrane 3, which is laid on the soil surface to form a sealed state; connecting pipes 4, which are sealed to the top of the sealing membrane 3 with a plurality of connecting pipes 4, each of which is sealed to its corresponding drainage board; an injection pump 9, which connects the connecting pipes 4 corresponding to the injection drainage boards 1 to a chemical tank 6, and the injection drainage boards 1 are used to transport leaching liquid and serve as a consolidation drainage channel; a vacuum pump 7, which connects the connecting pipes 4 corresponding to the extraction drainage boards 2 to a waste liquid tank 5; and a solar energy device, which is mounted above the sealing membrane 3 and electrically connected to the electric heating film 15.

[0044] The cross array arrangement of the present invention is a staggered array arrangement formed by a row of injection drainage plates 1, a row of extraction drainage plates 2, another row of injection drainage plates 1, and another row of extraction drainage plates 2.

[0045] The technical solution of this invention constructs a dredging sludge treatment system that combines direct heating with clean energy, rinsing, and vacuum pre-compression, integrating sludge removal and consolidation. This system can effectively remove toxic and harmful substances from the sludge, reduce soil moisture content, greatly simplify the construction process, and fully utilize clean energy to reduce environmental pollution.

[0046] This invention employs leaching technology to clean sludge, effectively removing heavy metal ions and various organic pollutants, significantly reducing threats to the environment and human health. The leaching agent is pumped into the soil through drainage boards, eliminating the need for additional pipelines. After leaching, the drainage boards can still drain and consolidate the soil normally. Based on commonly used pre-compression drainage systems, this invention simultaneously achieves sludge reinforcement and pollutant treatment, integrating sludge removal and consolidation, simplifying the construction process. Solar power generation technology provides electricity to the construction site, using clean energy and actively responding to the call for promoting clean energy, effectively reducing environmental pollution. This invention uses solar panels to heat the drainage boards, raising the soil temperature and providing a suitable reaction environment for the leaching liquid and pollutants, promoting the decomposition of organic pollutants, accelerating drainage rate, shortening soil consolidation time, and further simplifying the structure, effectively reducing environmental pollution.

[0047] See appendix Figure 5 The liquid injection drainage plate 1 is used as the liquid extraction drainage plate 2 during the liquid extraction operation, and is connected to the vacuum pump 7 and the waste liquid tank 5.

[0048] In other words, the drainage board can be used as a delivery channel for pumping in rinsing fluid and for solidification drainage. After rinsing is completed, both the injection drainage board and the extraction drainage board are used for extraction. Their tops are connected to the connecting pipe, and the liquid is transported and discharged together through the connecting pipe, resulting in a fast drainage speed.

[0049] In one embodiment of the present invention, see Appendix Figure 4 The drainage board is a plastic drainage board, comprising a core plate 14, an outer filter membrane 16, and an electrothermal membrane 15. The electrothermal membrane 15 is encapsulated within the core plate 14, and the core plate 14 is wrapped by the outer filter membrane 16. In the above embodiment, the core plate 14 is made of a high-strength, corrosion-resistant, high-temperature-resistant, and well-insulated material to prevent damage to the electrothermal membrane during insertion of the drainage board.

[0050] Advantageously, the electrothermal film 15 is heated by a metal busbar wrapped between two insulating films, and the busbar is electrically connected to the solar energy device; the insulating film is a polyester insulating film. After consolidation, the electrothermal film in the drainage board is recycled and reused in subsequent drainage board manufacturing.

[0051] The sealing membrane 3 described in this invention comprises a woven fabric and a geomembrane laid from bottom to top on the soil surface, with the edges of the geomembrane buried in the sealing trench to prevent air leakage.

[0052] In this invention, the connecting pipe 4 is a PVC pipe, and the geomembrane at the connection point between it and the drainage board is sealed. The PVC pipe needs to pass through the geomembrane to connect to the drainage board, and the opening needs to be sealed to prevent air leakage during vacuum preloading.

[0053] Advantageously, the injection pump 9 and the vacuum pump 7 can be optionally electrically connected to the solar energy device. The electrical energy consumed by the injection pump and the vacuum pump used for injecting the rinsing fluid and vacuuming is powered by the on-site solar panels, and an external power source can be used when solar energy cannot provide sufficient power.

[0054] This invention uses an injection pump to press the rinsing solution from the reagent tank into the sludge through the injection drainage plate to clean the sludge, and then discharges it into the waste liquid tank through the extraction drainage plate; the rinsing solution used can adsorb heavy metal ions in the sludge and decompose organic pollutants such as polychlorinated biphenyls and polycyclic aromatic hydrocarbons.

[0055] In the above embodiments, see the appendix. Figure 2 and 3 The solar energy device includes: a solar panel support 10, which is mounted above the sealing membrane, and on which solar panels 11 are laid; the solar panels 11 are electrically connected to a battery 12 via wires 13, and the battery 12 is connected to the waterproof conductive wire 17 of the heating film 15 via a cable 19 and a waterproof plug 18. The solar energy device is used to heat the sludge, which allows the washing agent to react fully with the pollutants, significantly shortening the sludge solidification time.

[0056] This invention also provides a method for treating dredged sludge using a combination of solar heating, rinsing, and vacuum precompression. The specific steps of the solar heating, rinsing, and vacuum precompression combined dredged sludge treatment system described above are as follows:

[0057] S1. Level the site for the dredged sludge, insert the drainage boards into the sludge soil to the specified depth using a bagged sand well installation machine, leave a predetermined exposed length, and arrange the drainage boards in a regular pattern at a certain distance, with the liquid injection drainage boards and the liquid extraction drainage boards distributed in a cross-array.

[0058] S2. After the drainage board is installed, use a multimeter to check the conductivity of the heating film in the drainage board in turn. If the inspection finds that the wire in the heating film is broken, the drainage board at the corresponding position must be reinstalled.

[0059] S3. Seal the interface between the drainage board and the connecting pipe with sealant; connect each drainage board to the battery; then lay a sealing membrane on the soil surface, burying the edges of the sealing membrane in the sealing trench to prevent air leakage;

[0060] S4. The connecting pipe on the liquid injection and drainage plate is connected to the chemical tank, and the washing agent is pumped into the sludge by the liquid injection pump. The connecting pipe on the liquid extraction and drainage plate is connected to the waste liquid tank, and the waste liquid is pumped into the waste liquid tank by the vacuum pump.

[0061] S5. Install solar panels so that the electricity they generate can be used to power all electrical facilities on site; turn on the power supply system to heat the electric heating film in the drainage board, use the drainage board to heat the sludge, and turn on the vacuum pump and liquid injection pump to wash the sludge.

[0062] S6. After rinsing, connect the injection drainage plate to the waste liquid tank; all drainage plates are used for vacuum pre-compression consolidation drainage; after consolidation, the electrothermal film in the drainage plate is recycled.

[0063] Specifically, the site is leveled for the dredged sludge, and drainage boards are inserted into the sludge soil to the specified depth using a bagged sand well drilling machine, leaving about half a meter of their length exposed. The drainage boards are arranged neatly at a certain distance, with the liquid injection drainage boards and liquid extraction drainage boards distributed in rows or columns (cross array arrangement).

[0064] After the drainage boards are installed, use a multimeter to check the conductivity of the heating film in the drainage boards one by one. If the inspection finds that the wires in the heating film are broken, the drainage boards at the corresponding positions must be reinstalled.

[0065] The interface between the drainage board and the PVC pipe is sealed with a sealing material. The drainage board is wrapped with an impermeable membrane within 10cm below the ground to prevent the washing liquid from leaking out from the sludge surface during the injection process.

[0066] Each drainage board is connected to a cable via a waterproof wire and a waterproof plug, and the cable is connected to the battery.

[0067] Then, woven fabric and geomembrane are laid on the soil surface, and the edges of the geomembrane are buried in the sealing trench to prevent air leakage.

[0068] The PVC pipe on the injection drainage board is connected to the infusion pipe, which is then connected to the chemical tank. The rinsing agent is pumped into the sludge by the injection pump. The PVC pipe on the extraction drainage board is connected to the infusion pipe, which is then connected to the waste liquid tank. The waste liquid is then pumped into the waste liquid tank by the vacuum pump.

[0069] The solar panel support is erected on the geomembrane, and the solar panels are laid on the support. The generated electricity is used to power all electrical facilities on site, including the electric heating film in the drainage board, the liquid injection pump, the vacuum pump and other equipment.

[0070] Turn on the power supply system to heat the electric heating film in the drainage board, use the drainage board to heat the sludge, turn on the vacuum pump and liquid injection pump to rinse the sludge.

[0071] After rinsing, the drain pipe is connected to the PVC pipe on the liquid injection drain plate. All drain plates are used for vacuum pre-compression consolidation drainage. After consolidation, the electrothermal film in the drain plate is recycled.

[0072] This invention utilizes a plastic drainage board with an internally encapsulated electrothermal film as a channel for rinsing injection and consolidation drainage. Rinsing solution is pumped into the sludge through the plastic drainage board, adsorbing heavy metal ions and decomposing organic pollutants. After rinsing, vacuum pre-compression consolidation drainage is performed. Compared with existing technologies, this system can simultaneously meet the engineering requirements of pollutant treatment and sludge solidification, shortening the treatment cycle and saving construction costs. Furthermore, a solar energy device is introduced to provide clean energy for the system. The electrothermal film in the drainage board heats the surrounding soil, accelerating pollutant decomposition, improving drainage efficiency, further optimizing the treatment effect, and the electrothermal film in the plastic drainage board can be recycled after construction, achieving sustainable resource utilization.

[0073] 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 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0074] 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 dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression, characterized in that: Used for dredging sludge, including: The drainage board is encapsulated with an electrothermal film (15) along its internal length direction, which is inserted into the sludge for heating the sludge, and includes a cross-array arrangement of injection drainage boards (1) and extraction drainage boards (2). A sealing membrane (3) is laid on the surface of the soil to form a sealed state; A plurality of connecting pipes (4) are sealed to the top of the sealing membrane (3), and each connecting pipe (4) is sealed to its corresponding drainage plate. The injection pump (9) and the connecting pipe (4) corresponding to the injection drainage plate (1) are connected to the reagent pool (6) through the injection pump (9); A vacuum pump (7) is used, and the connecting pipe (4) corresponding to the liquid drainage plate (2) is connected to the waste liquid pool (5) through the vacuum pump (7); A solar energy device, which is mounted above the sealing film (3) and electrically connected to the electrothermal film (15); The liquid injection drainage plate (1) is used as the liquid extraction drainage plate (2) under the liquid extraction condition, and is connected to the vacuum pump (7) and the waste liquid pool (5).

2. The dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression according to claim 1, characterized in that, The drainage board is a plastic drainage board, which includes a core board (14), an outer filter membrane (16) and the electrothermal membrane (15). The electrothermal membrane (15) is encapsulated inside the core board (14), and the core board (14) is wrapped by the outer filter membrane (16).

3. The dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression according to claim 2, characterized in that, The electric heating film (15) is heated by a metal busbar wrapped between two insulating films, and the busbar is electrically connected to the solar energy device; the insulating film is a polyester insulating film.

4. The dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression according to claim 2, characterized in that, The core board (14) is made of a high-strength, corrosion-resistant, high-temperature resistant and insulating material.

5. The dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression according to claim 2, characterized in that, The sealing membrane (3) includes a woven fabric and a geomembrane laid from bottom to top on the soil surface, with the edge of the geomembrane buried in the sealing trench.

6. The dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression according to claim 5, characterized in that, The connecting pipe (4) is a PVC pipe, and the geomembrane at the connection point with the drainage board is sealed.

7. The dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression according to any one of claims 1-6, characterized in that, The injection pump (9) and the vacuum pump (7) are electrically connected to the solar energy device.

8. The dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression according to any one of claims 1-6, characterized in that, The solar energy device includes: a solar panel support (10), which is mounted on the sealing film and on which a solar panel (11) is laid; the solar panel (11) is electrically connected to a storage battery (12) via a wire (13), and the storage battery (12) is connected to the waterproof conductive wire (17) of the electrothermal film (15) via a cable (19) and a waterproof plug (18).

9. A method for treating dredged sludge using a combination of solar heating, rinsing, and vacuum pre-compression, characterized in that: The specific steps of the dredged sludge treatment system combining solar heating, rinsing, and vacuum pre-compression as described in any one of claims 1-8 are as follows: S1. Level the site for the dredged sludge, insert the drainage boards into the sludge soil to the specified depth using a bagged sand well installation machine, leave a predetermined exposed length, and arrange the drainage boards in a regular pattern at a certain distance, with the liquid injection drainage boards and the liquid extraction drainage boards distributed in a cross-array. S2. After the drainage board is installed, use a multimeter to check the conductivity of the heating film in the drainage board in turn. If the inspection finds that the wire in the heating film is broken, the drainage board at the corresponding position must be reinstalled. S3. Seal the interface between the drainage board and the connecting pipe with sealant; connect each drainage board to the battery; then lay a sealing membrane on the soil surface, burying the edges of the sealing membrane in the sealing trench to prevent air leakage; S4. The connecting pipe on the liquid injection and drainage plate is connected to the chemical tank, and the washing agent is pumped into the sludge by the liquid injection pump. The connecting pipe on the liquid extraction and drainage plate is connected to the waste liquid tank, and the waste liquid is pumped into the waste liquid tank by the vacuum pump. S5. Install solar panels so that the electricity they generate can be used to power all electrical facilities on site; turn on the power supply system to heat the electric heating film in the drainage board, use the drainage board to heat the sludge, and turn on the vacuum pump and liquid injection pump to wash the sludge. S6. After rinsing, connect the injection drainage plate to the waste liquid tank; all drainage plates are used for vacuum pre-compression consolidation drainage; after consolidation, the electrothermal film in the drainage plate is recycled.

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