In-situ ecological restoration system for lake sludge

Abstract

The invention discloses a lake sludge in-situ ecological restoration system, and relates to the field of lake sludge treatment.The lake sludge in-situ ecological restoration system comprises a first frame with openings in the upper portion and the lower portion, and a partition plate is arranged in the first frame and divides the first frame into a plant planting area and a sludge fixing area from top to bottom in sequence; an insertion rod for being inserted into the bottom of a lake is arranged below the first frame body; two parallel rotating shafts are arranged at the position, close to the lower portion of the first frame body, in the sludge fixing area, fixing frames are arranged on the two rotating shafts, grid layers are arranged on the fixing frames, and mesh bags containing curing agents are arranged in gaps of the grid layers; adjusting pieces are arranged on the two rotating shafts and used for driving the rotating shafts to rotate so that the fixing frame can rotate to the horizontal state. The system not only can solve the problems of poor planting stability and difficult rooting of submerged plants, but also can realize the fixation of sludge.

Description

Technical Field

[0001] The present invention relates to the field of sludge treatment, and in particular to an in-situ ecological restoration system for lake sludge. Background Art

[0002] As a vital component of Earth's aquatic ecosystem, lakes not only provide a living environment for aquatic life but also play an irreplaceable role in regulating climate and maintaining ecological balance. However, with the continuous increase in human activities, lake silt pollution is becoming increasingly serious, becoming a major threat to the health of water bodies and the ecological environment.

[0003] Lake silt pollution not only disrupts the balance of lake ecosystems but also directly and indirectly impacts the habitat and populations of aquatic organisms. Suspended matter settles in the sediment, directly inhibiting the survival of benthic organisms. Toxic substances and oxygen-consuming organic matter sink to the bottom of the water, potentially poisoning benthic organisms or causing the sediment to become black and smelly. Pollutants such as heavy metals accumulate in the sediment, posing a threat to human health through the food chain.

[0004] Furthermore, lake silt pollution contributes to eutrophication. As an endogenous source of pollution, silt releases nutrients like nitrogen and phosphorus when the external environment changes, promoting abnormal algae proliferation. This not only leads to a darkening of the water, a decrease in transparency, and a reduction in dissolved oxygen, but also deteriorates water quality, leading to mass deaths of fish and other aquatic life and disrupting the ecological balance of the water. This has become a key factor affecting lake water quality and ecosystem health.

[0005] Existing in-situ ecological restoration of lake silt involves planting submerged plants to stabilize sediment and purify water. Mud cover, for example, involves covering contaminated silt with a layer of clean sediment, gravel, sand, or artificial foundation materials to reduce the release of pollutants into the water. However, this method can reduce lake storage capacity and is not suitable for shallow watersheds and ponds.

[0006] Dredging involves removing sediment from the lake floor through mechanical or other means to reduce the pollutant content in the sludge. This method can effectively reduce endogenous pollution, restore the lake's self-purification capacity, and improve water quality. However, dredging is a large and costly undertaking. Furthermore, the disturbance of sludge during dredging can reduce water clarity and accelerate the migration of nutrients from the sludge into the water, causing secondary pollution. Furthermore, dredged sludge needs to be properly handled, otherwise it can become a new source of pollution.

[0007] Bioremediation uses organisms such as microorganisms and plants to degrade pollutants in silt, thereby purifying it. Planting aquatic plants with strong tolerance and absorption capacity in lake silt can absorb nutrients such as nitrogen and phosphorus from the water. Regular harvesting of the plants removes some nutrients, thereby reducing the level of water pollution. However, high-organic-matter, loose silt typically has a high water content, making it difficult for submerged plants to establish and take root, resulting in low survival rates. Consequently, bioremediation methods are difficult and ineffective.

[0008] In summary, traditional lake silt remediation methods have obvious limitations. Therefore, an in-situ lake silt ecological remediation system is urgently needed. Summary of the Invention

[0009] One purpose of the present invention is to provide an in-situ ecological restoration system for lake silt. For loose silt, this system fixes the loose silt in the silt fixing area of ​​the first frame. By fixing the first frame and the silt, the stability of the roots of submerged plants in the plant planting area is improved. At the same time, the grid layer acts on the loose silt to prevent the silt from being impacted and disturbed, causing water turbidity and affecting the photosynthesis of submerged plants.

[0010] This purpose is achieved by adopting the following technical solutions:

[0011] A lake silt in-situ ecological restoration system comprises a first frame with openings at the top and bottom, a partition provided in the first frame, the partition dividing the first frame into a plant planting area and a silt fixing area from top to bottom, an insertion rod for inserting into the bottom of a lake is provided below the first frame; when in use, the first frame is slowly lowered into the silt at the bottom of the lake, so that the insertion rod and the silt fixing area of ​​the first frame are both inserted into the silt at the bottom of the lake, and the insertion rod is further inserted into the bottom of the lake for preliminary fixation.

[0012] The system's first frame is constructed from bamboo strips woven using a bamboo weaving process. Bamboo is a renewable material with high strength, corrosion resistance, and wear resistance, ensuring long-term stable operation in complex underwater environments. When the silt retention area of ​​the first frame is inserted into the silt at the bottom of the lake, loose silt will be disturbed within the area, affecting retention efficiency.

[0013] Therefore, the inventors set up two parallel rotating shafts near the bottom of the first frame in the sludge fixing area, and both rotating shafts are provided with fixing frames, and the fixing frames are provided with grid layers, and mesh bags filled with curing agent are provided in the gaps of the grid layers.

[0014] More preferably, the mesh layer is made of carbon fiber material, and a curing layer is provided on the mesh layer. Carbon fiber material has strong adsorption properties to liquid curing agents (such as high-concentration solutions). The mesh layer is immersed in the liquid curing agent, which adsorbs the liquid curing agent to the surface and forms an adhesion layer after drying, i.e., the curing layer.

[0015] Both rotating shafts are equipped with adjustment members, which are used to drive the rotating shafts to rotate and rotate the fixed frame to a horizontal state. During the rotation of the rotating shaft, the fixed frame is rotated, and the rotation of the mesh layer on the fixed frame drives the disturbed sludge to settle, accelerating the sludge sedimentation within the fixed frame. At the same time, when the fixed frame is horizontal, mesh bags containing curing agent are installed in the gaps between the mesh layers, slowly releasing the curing agent and contacting the sludge. At the same time, the rotating shaft of this structure is arranged in the sludge fixing area near the bottom of the first frame. Therefore, the curing agent directly contacts the deep sludge, which can further improve the sludge curing efficiency.

[0016] The solidifying agent diffuses and reacts with the silt. The solidifying agent (such as magnesium minerals) wraps the heavy metal ions in inert substances through chemical reactions, reducing their bioavailability and preventing them from entering the food chain after being absorbed by plants or microorganisms. At the same time, the solidified body has high strength and low permeability, which can effectively prevent pollutants in the bottom mud from diffusing into the water body.

[0017] Furthermore, after the mesh layer sinks into the silt, the curing agent diffuses and reacts with the silt, reducing the silt's moisture content to below 10% through the curing agent (such as cement or a composite cementitious material), forming high-strength solidified soil. After the silt solidifies, the mesh layer and the silt solidify together, further improving the stability of the connection between the first frame and the silt, thereby improving the rooting stability of submerged plants in the plant planting area. Preferably, when the fixed frame is rotated to a horizontal state, the distance between the fixed frame and the bottom of the first frame is less than 10 cm. The fixed frame is in contact with the silt sedimentation site, i.e., deep in the silt, which can improve sedimentation efficiency and enhance the curing effect, thereby improving stability.

[0018] Furthermore, silt contains high levels of organic matter and sulfide, potentially releasing foul-smelling gases such as hydrogen sulfide (H2S) and ammonia (NH3), as well as methane (CH4) and volatile fatty acids, during the initial solidification process. The hydration reaction between solidifying agents (such as magnesium oxide and aluminum silicate) and the water in the silt may also release small amounts of CO2. Under anaerobic or anoxic conditions, microbial decomposition of organic matter may produce methane and N2O (a greenhouse gas).

[0019] If the generated gas is discharged directly through the first frame, the gas discharge process will disturb the silt, which will easily cause turbidity in the water body and affect the growth of plants. Therefore, the inventors also set a second frame with openings at both ends. The first frame is located in the second frame. Four cylindrical cavities with open tops are set between the first frame and the second frame. The upper ends of the cylindrical cavities are located above the water surface, and part of the side surfaces of the cylindrical cavities are located in the first frame; vents are set on some of the side surfaces of the cylindrical cavities. The vents are used to discharge the gas in the silt fixing area above the water surface. A bentonite isolation layer is set in the first frame. The first frame and the second frame can enhance the strength and rigidity of the present structure while reducing the overall weight for easy transportation and installation.

[0020] The bentonite barrier is an engineered barrier primarily constructed from bentonite. Bentonite swells in contact with water, forming a colloidal structure that fills micropores and creates seamless, seepage-proof structures. This barrier prevents gas and silt from escaping through the gaps in the first frame, thereby disrupting the silt. Furthermore, the bentonite effectively blocks water infiltration from the silt, improving its stability within the first frame. Bentonite also possesses self-healing capabilities. When the first frame is disturbed and deformed by external forces, the bentonite can self-fit tightly into the barrier, repairing tiny cracks in the barrier and maintaining its integrity.

[0021] The gas in the first frame enters the cylindrical cavity through the vents on some sides of the cylindrical cavity and is discharged through the upper end of the cylindrical cavity. Since the upper end of the cylindrical cavity is located on the lake surface, the vents are used to discharge the gas in the silt fixed area above the water surface to prevent the gas from acting on the silt and causing turbidity in the water.

[0022] Furthermore, a rotating column with an open top is disposed within the cylindrical cavity. An opening is disposed on the side of the rotating column. The rotating column rotates within the cylindrical cavity, connecting the opening on the side of the rotating column to the corresponding vent. In its initial state, the rotating column rotates, disconnecting the opening from the vent, thereby preventing gas and sludge within the sludge holding area of ​​the first frame from entering the cylindrical cavity. After initial fixation, the rotating column rotates, connecting the opening on the side of the rotating column to the corresponding vent, thereby discharging gases generated during the initial solidification stage and the later microbial treatment directly onto the lake surface.

[0023] Based on the above structure, the inventors have preferred an adjustment member structure in which a cylindrical cavity divides the area between the first frame and the second frame into two first regions and two second regions, the first region being connected to the cylindrical cavities at both ends of the first region. The adjustment member includes a first rotating gear disposed on a rotating shaft, an adjustment rod disposed within the first region, and an adjustment rod provided with a first gear that meshes with the first rotating gear. The adjustment rod moves within the first region, causing the fixed frame to rotate to a horizontal state. A second rotating gear is disposed below the rotating column, and the adjustment rod is provided with a second gear that meshes with the second rotating gear. When the rotating column rotates, the second rotating gear and the second gear drive the adjustment rod to move within the first region, causing the fixed frame to rotate to a horizontal state.

[0024] When the rotating column rotates, the rotating column drives the second rotating gear to rotate. When the second rotating gear rotates, it acts on the second gear of the adjusting rod, thereby driving the adjusting rod to move in the first area. During the movement of the adjusting rod, the first gear on the adjusting rod acts on the first rotating gear, causing the first rotating gear to rotate. When the first rotating gear rotates, it drives the rotating shaft to rotate, thereby achieving the effect of rotating the fixed frame to a horizontal state.

[0025] By rotating the rotating column, this system not only adjusts the position of the fixed frame to make it rotate to a horizontal state, but also connects the opening on the side of the rotating column to the corresponding vent, thereby directly discharging the gas generated in the early stage of solidification and the later stage of microbial treatment to the lake surface, making it easier to operate and use.

[0026] Furthermore, the plant planting area includes a three-dimensional mesh cushion layer, a filter sand layer and a zeolite layer from top to bottom.

[0027] The three-dimensional mesh cushion layer stabilizes plant growth and promotes water exchange. The filter sand layer blocks silt disturbance, and the zeolite layer improves silt stability in the tank and inhibits the release of high-organic and high-nitrogen organic matter in the silt.

[0028] The first frame is provided with a microbial layer, which can be a starch capsule or a mesh skeleton that slowly releases microorganisms to prolong their action time and prevent loss, thereby building a "microorganism-plant" symbiotic system and improving self-purification capabilities.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] This invention provides an in-situ ecological restoration system for lake silt. This system not only addresses the issues of poor plant stability and rooting difficulties for submerged plants, but also stabilizes the silt. This effectively addresses the problem of severely reduced water transparency and poor photosynthesis of submerged plants, which hinders plant growth, caused by the impact and disturbance of natural forces such as lake currents, wind and waves, thus truly achieving in-situ ecological restoration of lake silt.

[0031] This system is low-cost and easy to construct. Compared with traditional sludge treatment methods, this system does not require a large amount of manpower and material resources, nor does it require complex construction equipment and technology. It not only reduces the cost of repair, but also improves construction efficiency.

[0032] This system also has beneficial ecological and landscape benefits. During the restoration process, ecological restoration measures such as planting submerged plants can increase the lake's biodiversity and improve the lake's ecological environment. Furthermore, the growth and reproduction of submerged plants can improve the lake's water quality and reduce pollutant emissions. Furthermore, the beautiful forms and colors of submerged plants add a beautiful touch to the lake's landscape, enhancing its scenic value.

[0033] This system is also sustainable and long-term. By restoring the natural ecosystem of lake silt and enhancing the lake's self-repairing capacity, it achieves long-term ecological benefits. Compared with traditional silt treatment methods, this technology requires less frequent repair and maintenance, reducing subsequent management costs. Furthermore, because it performs repairs in situ, it does not disrupt the lake's original ecological structure, making it highly sustainable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0035] Figure 1 It is a structural diagram of the plant planting area and the silt fixing area of ​​the first frame;

[0036] Figure 2 This is a structural diagram of the first frame body rotating so that the fixed frame drives the grid layer to rotate to a horizontal state;

[0037] Figure 3 A schematic diagram of the positions between the first frame, the second frame and the cylindrical cavity;

[0038] Figure 4 Schematic diagram of the structure of the rotating column;

[0039] Figure 5 A schematic diagram of a structure in which a second rotating gear is provided below the rotating column and the second rotating gear is engaged with the second gear on the adjusting rod;

[0040] Figure 6 Schematic diagram of the structure of the first rotating gear and the adjusting rod;

[0041] Figure 7 It is a structural diagram of the first rotating gear and the adjusting rod when the fixed frame rotates to a horizontal state;

[0042] Figure 8 A schematic diagram of the positional relationship of the adjustment rods when the fixed frame is in a non-horizontal state;

[0043] Figure 9 This is a structural diagram showing the position relationship of the adjustment rods when the fixed frame rotates to a horizontal state.

[0044] Markings and corresponding parts names in the accompanying drawings:

[0045] 1-first frame, 2-second frame, 3-cylindrical cavity, 4-first area, 5-second area, 6-rotating column, 7-opening, 8-second rotating gear, 9-adjusting rod, 10-rotating shaft, 11-fixed frame, 12-grid layer, 13-first rotating gear, 14-insertion rod, 15-partition, 16-zeolite layer, 17-filter sand layer, 18-three-dimensional mesh pad layer. DETAILED DESCRIPTION

[0046] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0047] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0048] Example 1

[0049] A lake silt in-situ ecological restoration system, such as Figure 1 As shown, it includes a first frame body 1 with openings at the top and bottom. The interior of the first frame body 1 is a cavity, and the surrounding area forms a rectangular area.

[0050] A partition 15 is provided within the first frame 1, dividing it from top to bottom into a plant planting area and a silt fixation area. An insertion rod 14 for insertion into the lake bottom is provided below the first frame 1. Two parallel rotating shafts 10 are provided within the silt fixation area, near the bottom of the first frame 1. Each rotating shaft 10 is provided with a fixing frame 11, which is provided with a mesh layer 12. Mesh bags filled with a curing agent are provided in the gaps between the mesh layers 12. Adjustments are provided on each rotating shaft 10 to rotate the rotating shaft 10, thereby rotating the fixing frame 11 to a horizontal position. In some embodiments, the first frame 1 is made of woven bamboo.

[0051] In some embodiments, the plant planting area includes, from top to bottom, a three-dimensional mesh cushion layer 18, a filter sand layer 17, and a zeolite layer 16. The plant planting area is used to plant submerged plants. Suitable submerged plant seedlings, such as black algae and foxtail algae, are selected and planted in the plant planting area. After the seedlings have grown to a certain size, the insertion rod 14 of the first frame 1 is inserted into the bottom of the lake.

[0052] When in use, the insertion rod 14 of the first frame 1 is first inserted into the mud at the bottom of the lake, and then the mud fixing area of ​​the first frame 1 is inserted into the mud, and the insertion rod 14 passes through the mud and is inserted into the bottom of the lake. At this time, the first frame is as Figure 1 When the insertion rod is inserted into the bottom of the lake, the adjusting member drives the shaft 10 to rotate, and the rotation of the shaft 10 causes the fixed frame 11 to drive the grid layer 12 to rotate to a horizontal state, as shown. Figure 2 shown.

[0053] During the rotation of the mesh layer and the fixed frame, they act on the silt, causing it to settle and preventing disturbances within the first frame that would affect solidification. Simultaneously, during the rotation of the mesh layer, the curing agent in the mesh bag on the mesh layer comes into contact with the interior of the silt, improving the solidification efficiency of the silt. Furthermore, in some embodiments, when the fixed frame 11 is rotated to a horizontal position, the distance between the fixed frame 11 and the bottom of the first frame 1 is less than 10 cm. That is, when the fixed frame 11 is rotated to a horizontal position, the fixed frame is close to the bottom of the first frame, and the fixed frame comes into contact with the silt at the bottom, improving the fixing efficiency.

[0054] In some embodiments, the curing agent in the mesh bag can be a magnesium-based curing agent, primarily composed of magnesium oxide. It fixes pollutants and absorbs carbon dioxide through chemical reactions, is highly environmentally friendly, and forms a stable, inert substance after curing, blocking the dissolution of heavy metals and organic matter. Alternatively, the curing agent can be a calcium-based curing agent, containing calcium compounds such as lime or cement-based materials. Through ion exchange and gelation, it improves sludge strength and permeability. Alternatively, the curing agent can be a bio-enzyme preparation that accelerates the degradation of organic matter, promotes the formation of aggregate structures, and improves the permeability of the sediment. The curing agent can be an existing material. The mesh bag is a degradable fiber or starch-based carrier.

[0055] In some embodiments, the mesh layer 12 is made of carbon fiber material and is provided with a curing layer. The mesh layer is immersed in a curing agent solution. The curing agent liquid can be a liquid curing agent suitable for rapid penetration and uniform distribution, such as iron slurry-based products. The mesh layer is immersed in the curing agent solution for 30 minutes or longer to ensure that the mesh layer fully absorbs the liquid. After soaking, the mesh layer is laid flat on a dry area and air-dried or an infrared lamp is used to accelerate the bonding of the curing agent and the mesh layer. The curing agent solution is a readily available material.

[0056] In some embodiments, in the original state, that is, when the shaft 10 is not rotating, the fixed frame 11 can be in a vertical state or in an inclined state. When the fixed frame is in the inclined state, the angle between the fixed frame and the horizontal line is 60 degrees or 45 degrees.

[0057] Example 2

[0058] The lakes in this system are used for shallow lakes with an average depth of less than 4 meters, which are more vulnerable to eutrophication. Shallow lakes have weak self-purification capabilities and pollutants are easily accumulated.

[0059] Based on the above embodiments, Figure 3 As shown, the system also includes a second frame 2 with openings at both ends. The first frame 1 is located within the second frame 2. Four cylindrical cavities 3 with open tops are disposed between the first and second frames 1 and 2. The tops of the cylindrical cavities 3 are located above the water surface, and portions of the sides of the cylindrical cavities 3 are located within the first frame 1. The four cylindrical cavities 3 are located at four diagonal corners of the first frame 1. Vents are provided on portions of the sides of the cylindrical cavities 3. A bentonite isolation layer is provided within the silt retention area within the first frame 1. Therefore, gas within the silt retention area within the first frame 1 can only be discharged above the water surface through the vents on portions of the sides of the cylindrical cavities 3.

[0060] In some embodiments, a rotating column 6 with an open upper end is provided in the cylindrical cavity 3. The rotating column 6 is fixedly provided in the cylindrical cavity 3 and can rotate circumferentially in the cylindrical cavity 3. The structure of the rotating column 6 is as follows: Figure 4 As shown, an opening 7 is provided on the side of the rotating column 6. The rotating column 6 rotates in the cylindrical cavity 3 so that the opening 7 on the side of the rotating column 6 is connected to the vent port accordingly.

[0061] Therefore, during use, after the insertion rod is inserted into the bottom of the lake, the rotating column 6 rotates, so that the opening 7 on the side of the rotating column 6 is connected to the corresponding vent, and the gas in the silt fixing area in the first frame 1 is discharged to above the water surface through the vent on part of the side of the cylindrical cavity 3, avoiding the gas disturbing the silt and causing turbidity in the water.

[0062] Example 3

[0063] On the basis of the above embodiment, the cylindrical cavity 3 divides the area between the first frame 1 and the second frame 2 into two first areas 4 and two second areas 5, and the first area 4 is connected to the cylindrical cavity 3 at both ends of the first area 4. Figure 5As shown, a second rotating gear 8 is provided below the rotating column 6, and the adjusting member includes an adjusting rod 9 provided in the first area 4. The adjusting rod 9 can move in the first area 4 and the cylindrical cavity 3. A second gear engaged with the second rotating gear 8 is provided on the adjusting rod 9. When the rotating column 6 rotates, the second rotating gear 8 at the lower end of the rotating column 6 acts on the second gear on the adjusting rod 9, causing the adjusting rod 9 to move in the first area 4.

[0064] Furthermore, a first sealing layer is provided on the side of the rotating column 6. This sealing layer prevents gas, silt, or water from entering the second rotating gear 8 through the vents on the side of the cylindrical cavity 3. At the same time, the rotating column can rotate circumferentially at the sealed portion. A second sealing layer is provided at the upper and lower ends between the first frame 1 and the second frame 2. The upper end of the cylindrical cavity 3 passes through the second sealing layer and is located above the water. Due to the action of the first and second sealing layers, the two first areas 4 and the two second areas 5 are sealed spaces, meaning that silt, water, and other substances cannot enter the two first areas 4 and the two second areas 5. The rotating column 6 and the second rotating gear 8 can be made of wood or other materials.

[0065] In some embodiments, Figure 6 As shown, the adjusting member includes a first rotating gear 13 provided on the rotating shaft 10, and the adjusting rod 9 is provided with a first gear engaged with the first rotating gear 13. The adjusting rod 9 moves in the first area 4 to rotate the fixed frame 11 to a horizontal state, as shown in FIG. Figure 7 Wherein, the second gear is arranged on the side of the adjusting rod 9, and the first gear is arranged on the upper end surface of the adjusting rod 9.

[0066] When in use, after the insertion rod is inserted into the bottom of the lake, Figure 8 As shown, at this time, the second rotating gear 8 is engaged with the second gear, and the rotating column 6 is rotated, so that the second rotating gear 8 of the rotating column 6 acts on the second gear on the adjusting rod 9, so that the adjusting rod 9 moves toward the direction of the second rotating gear 8 with which it is engaged. The opening 7 on the side of the rotating column 6 is connected to the vent correspondingly. At the same time, during the movement of the adjusting rod 9, the first gear drives the first rotating gear 13 to rotate, so that the fixed frame 11 rotates to a horizontal state, as shown in FIG. Figure 9 shown.

[0067] Example 4

[0068] Based on the above embodiment, a microorganism layer is provided in the first frame 1. The microorganism layer includes a mesh frame and microorganism strains provided in the mesh frame. Both the mesh frame and the microorganism strains provided in the mesh frame are existing structures.

[0069] In some embodiments, the microbial layer is encapsulated within a water-soluble capsule shell layer. When the sludge holding area of ​​the first frame is inserted into the sludge, the capsule shell layer slowly dissolves, and the microbial strains within the mesh framework are slowly released into the sludge, thereby treating the sludge.

[0070] The terms "first," "second," and "third" used herein are merely used to distinguish corresponding components for clarity of description and are not intended to limit any order or emphasize importance. In addition, the term "connected" used herein, unless otherwise specified, may refer to a direct connection or an indirect connection via other components.

[0071] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lake sludge in-situ ecological restoration system, characterized in that: The invention comprises a first frame (1) with openings at the top and bottom, a partition (15) being provided in the first frame (1), the partition (15) dividing the first frame (1) into a plant planting area and a silt fixing area from top to bottom, and an insertion rod (14) for inserting into the bottom of a lake being provided below the first frame (1); Two mutually parallel rotating shafts (10) are provided in the sludge fixing area near the bottom of the first frame (1), and a fixing frame (11) is provided on each of the two rotating shafts (10). A mesh layer (12) is provided on the fixing frame (11), and mesh bags filled with a curing agent are provided in the gaps of the mesh layer (12); Both rotating shafts (10) are provided with adjusting members, which are used to drive the rotating shafts (10) to rotate so that the fixed frame (11) rotates to a horizontal state.

2. The lake sludge in-situ ecological restoration system according to claim 1, characterized in that: When the fixing frame (11) is rotated to a horizontal state, the distance between the fixing frame (11) and the bottom of the first frame body (1) is less than 10 cm.

3. The lake sludge in-situ ecological restoration system according to claim 1, characterized in that: The invention also comprises a second frame (2) with openings at both the top and the bottom, the first frame (1) being located inside the second frame (2), four cylindrical cavities (3) with openings at the top being arranged between the first frame (1) and the second frame (2), the tops of the cylindrical cavities (3) being located above the water surface, and part of the side surfaces of the cylindrical cavities (3) being located inside the first frame (1); and vents being arranged on part of the side surfaces of the cylindrical cavities (3), the vents being used to discharge gas in the silt fixing area to above the water surface.

4. The lake sludge in-situ ecological restoration system according to claim 3, characterized in that: A rotating column (6) with an upper opening is provided in the cylindrical cavity (3), and an opening (7) is provided on the side of the rotating column (6). The rotating column (6) rotates in the cylindrical cavity (3), so that the opening (7) on the side of the rotating column (6) is connected to the vent port.

5. The lake sludge in-situ ecological restoration system according to claim 4, characterized in that: The cylindrical cavity (3) divides the area between the first frame (1) and the second frame (2) into two first areas (4) and two second areas (5). The first area (4) is connected to the cylindrical cavity (3) at both ends of the first area (4). The adjusting member includes a first rotating gear (13) arranged on the rotating shaft (10). An adjusting rod (9) is arranged in the first area (4). The adjusting rod (9) is provided with a first gear meshing with the first rotating gear (13). The adjusting rod (9) moves in the first area (4) to rotate the fixed frame (11) to a horizontal state.

6. The lake sludge in-situ ecological restoration system according to claim 5, characterized in that: A second rotating gear (8) is provided below the rotating column (6), and a second gear meshing with the second rotating gear (8) is provided on the adjusting rod (9). When the rotating column (6) rotates, the adjusting rod (9) is driven by the second rotating gear (8) and the second gear to move within the first area (4), so that the fixed frame (11) rotates to a horizontal state.

7. The lake sludge in-situ ecological restoration system according to claim 1, characterized in that: The plant planting area includes, from top to bottom, a three-dimensional mesh cushion layer (18), a filter sand layer (17) and a zeolite layer (16).

8. The lake sludge in-situ ecological restoration system according to claim 1, characterized in that: The first frame (1) is made of bamboo woven material, and a bentonite isolation layer is provided in the first frame (1).

9. The lake sludge in-situ ecological restoration system according to claim 1, characterized in that: The mesh layer (12) is made of carbon fiber material, and a solidified layer is provided on the mesh layer (12).

10. The lake sludge in-situ ecological restoration system according to claim 1, characterized in that: A microorganism layer is provided in the first frame (1).

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