Submerged plant planting device for sealing bottom mud pollution

Abstract

The utility model discloses a planting device for sealing bottom mud polluted submerged plants, which comprises a plurality of gabion gabions, each gabion is internally provided with an isolating layer for preventing bottom mud pollutants from being released to an overlying water body, an adsorption layer for adsorbing heavy metals, N, P and other pollutants in the water body, and a planting layer in which submerged plants with certain density are planted from bottom to top; the isolating layer comprises a geomembrane laid at the bottom of the inner side of the gabion and geotechnical cloth laid on the four walls of the inner side of the gabion, a landing edge is arranged between the geomembrane and the geotechnical cloth, and a modified filter material is laid in the adsorption layer on the geomembrane; the planting layer comprises a planting soil layer and a coconut shred fiber layer. The device disclosed by the utility model not only can effectively prevent bottom mud pollutants from entering a water body, but also constructs an isolating layer to protect water quality; in addition, through the design of the geotextile and the geomembrane, the structural integrity of the device is guaranteed; in addition, by selecting the modified filter material and submerged plants, effective protection and recovery of the water body environment are realized.

Description

Technical Field

[0001] The utility model belongs to the field of water ecological restoration and bottom mud pollution control, and in particular relates to a submerged plant planting device for sealing bottom mud pollution. Background Art

[0002] With the rapid development of the economy, water pollution in urban rivers, lakes and other water systems is becoming increasingly serious, and the trend of eutrophication is developing rapidly. Sediment is the sediment of rivers and lakes, and is an important part of natural waters. When waters are polluted, some pollutants in the water can be stored in the sediment through precipitation or adsorption of particulate matter, and then released again under appropriate conditions, becoming a secondary pollution source.

[0003] At present, controlling sediment pollution has become an important task in the treatment of water pollution. Among the treatment technologies for polluted sediment, although off-site treatment technologies (such as sediment dredging) are quick to take effect, the project is huge, not only consuming a lot of manpower, material and financial resources, but also difficult to meet the standards through sediment dredging. Large-scale governance is even more difficult to achieve in economically underdeveloped areas. Therefore, if a low-cost product for the treatment of river and lake sediment pollution can be developed, it will be of great significance to the treatment of urban polluted water systems.

[0004] After searching, the existing Chinese utility model application document with announcement number CN217480088U discloses a river slope protection construction structure, "the river slope protection construction structure includes a slope foot protection structure, the slope foot protection structure includes at least one first cage fixed at the foot of the river slope; a slope protection structure, the slope protection structure is arranged on the slope of the river and is fixedly connected to the slope foot protection structure, the slope protection structure is formed by connecting a plurality of second cages in parallel, wherein the second cage is assembled from a mesh body of a preset shape and a plurality of mesh pieces, the mesh body is laid along the slope, the length direction of the mesh body is along the transverse direction of the slope, and a plurality of mesh pieces are connected to the mesh body at intervals in the transverse direction, so that a plurality of spaced-apart filling spaces are formed in the second cage body." Although the utility model has designed the gabion cage body and has a certain stability on the slope, the purpose of the construction structure is mainly to avoid collapse and soil erosion on the river slope, so there is still a lack of design for the treatment of lake bottom sediment pollution, which has certain limitations. Utility Model Content

[0005] In order to solve the above-mentioned problems existing in the prior art, the purpose of the utility model is to provide a submerged plant planting device for sealing bottom mud pollution.

[0006] In order to achieve the above purpose and other related purposes, the utility model adopts the following technical solutions:

[0007] The utility model provides a submerged plant planting device for sealing bottom sediment pollution, comprising a plurality of gabion stone cages, wherein each gabion stone cage is provided with an isolation layer for blocking the release of bottom sediment pollutants to an overlying water body, an adsorption layer for absorbing heavy metals and N, P and other pollutants in the water body, and a planting layer for planting submerged plants with a certain density from bottom to top, wherein the isolation layer comprises a geomembrane, and the geomembrane is laid on the inner bottom of the gabion stone cage; a modified filter material is laid in the adsorption layer, and the modified filter material is laid on the geomembrane; and the planting layer comprises a planting soil layer and a coconut fiber layer.

[0008] As a preferred technical solution, the type and properties of the modified filter material are determined according to the type and concentration of pollutants in the sediment:

[0009] When the heavy metal content in the sediment exceeds the standard, the modified filter material is attapulgite clay;

[0010] When the nitrogen and phosphorus content in the sediment exceeds the standard, the modified filter material is a zeolite porous adsorption material;

[0011] When the content of organic pollutants in the sediment exceeds the standard, the modified filter material is a carbonaceous adsorbent.

[0012] As a preferred technical solution, the isolation layer also includes a geotextile, which is attached to the inner four walls of the gabion cage. Furthermore, there is an overlap between the geotextile and the geomembrane, and the overlap length is greater than 10 cm.

[0013] As a preferred technical solution, the modified filter material in the adsorption layer is laid with a thickness of 5-10 cm; the planting soil and coconut fiber in the planting layer are laid with a thickness of 10-20 cm.

[0014] As a preferred technical solution, the gabion cage is an ecological grid structure, which is woven with thick galvanized low-carbon steel wire, and each gabion cage is connected by a buckle. Further, the size of the gabion cage is 1.5m*1.5m*25cm, and the aperture is 80mm*100mm.

[0015] As a preferred technical solution, the material of the geomembrane is high-density polyethylene (HDPE).

[0016] As a preferred technical solution, the geotextile material is 500g / m 2 The non-woven geotextile has a size of 1.5m*1.5m.

[0017] As a further preferred technical solution, the types of submerged plants are determined according to the water depth of rivers and lakes:

[0018] When the water depth is 0.5-1m, the submerged plant is a dwarf Vallisneria;

[0019] When the water depth is 1.0-1.5m, the submerged plant is Potamogeton;

[0020] When the water depth is 1.5-2m, the submerged plants are giant hydrilla or duckweed.

[0021] As described above, the utility model has the following beneficial effects:

[0022] (1) The utility model is a submerged plant planting device for sealing sediment pollution. It is simple and easy to operate. By covering the submerged plant planting device on the riverbed sediment, it not only prevents heavy metals and pollutants such as N and P in the sediment from entering the water body, but also cuts off the pollution path of the pollution source, making it less likely to cause secondary pollution.

[0023] (2) The utility model is a submerged plant planting device for sealing sediment pollution. By laying a geomembrane on the inner bottom of the gabion stone cage, an effective isolation layer can be constructed to block the release of potential pollutants in the sediment to the overlying water body, thereby protecting the water quality. Moreover, since the geomembrane has the characteristics of high strength, corrosion resistance and good anti-microbial properties, it can maintain stability and reliability in complex soil and water environments, not only preventing damage by microorganisms and insect infestations, but also ensuring long-term waterproofing effects. In addition, the geomembrane material is light and soft, easy to transport and construct, and can be conveniently laid on the inner bottom of the gabion stone cage to meet various engineering needs, further improving construction efficiency and engineering quality, not only helping to maintain the ecological balance of the water body, but also promoting the safety and durability of the project.

[0024] (3) The utility model is a submerged plant planting device for sealing bottom mud pollution. By arranging geotextiles on the four inner walls of the gabion stone cage, it can effectively prevent water flow from scouring the modified filter material and planting soil, thereby ensuring the structural integrity of the submerged plant planting device. At the same time, through the overlap design between the geotextile and the geomembrane, it can further prevent water flow from carrying away the filter material and planting soil when scouring the geotextile.

[0025] (4) The utility model is a submerged plant planting device for sealing bottom mud pollution. By determining the type and properties of the modified filter material according to the type and concentration of the pollutants in the bottom mud, it has the advantage of accurately matching the pollutant treatment needs. At the same time, this design also has the effect of improving treatment efficiency, reducing costs and reducing environmental pollution, thereby improving the overall performance of the device and being able to more effectively remove pollutants in the bottom mud, thereby achieving effective protection and restoration of the water environment.

[0026] (5) The utility model is a submerged plant planting device for sealing bottom sediment pollution. By determining the type of submerged plants in the planting layer according to the water depth of rivers and lakes, it has the advantage of optimizing the plant growth environment. At the same time, this design also has the effect of improving the stability and diversity of the ecosystem, thereby enhancing the device's ability to purify bottom sediment pollutants, and can more effectively improve water quality and promote the ecological balance of the water body, thereby achieving effective protection and restoration of the water ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a cross-sectional schematic diagram of a submerged plant planting device for sealing bottom mud pollution.

[0028] Figure 2 yes Figure 1 A partial enlarged structural diagram of the overlapping part of the gabion cage at point A in the middle.

[0029] Figure 3 It is a structural schematic diagram of a single gabion stone cage in the utility model.

[0030] Figure 4 It is a schematic diagram of the combined structure between the gabion stone cage monomers in the utility model.

[0031] Among them, the specific descriptions of the accompanying drawings are as follows: 1. Gabion stone cage; 2. Geomembrane; 3. Modified filter material; 4. Planting soil; 5. Submerged plants; 6. Geotextile; 7. Coconut fiber; 8. Buckle. DETAILED DESCRIPTION

[0032] In order to better understand the purpose, structure and function of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] In the description of the present invention, it should be noted that the positional relationships indicated by terms such as “longitudinal”, “lateral”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” cited in this specification are based on the positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] Example

[0035] like Figure 1-4As shown, this embodiment provides a submerged plant planting device for sealing sediment pollution, which is applicable to rivers and lakes with a water depth of 0.5-2.0m. The device includes a plurality of gabions 1, which are ecological grid structures. The ecological grid structure is made of thick galvanized low-carbon steel wire and has high tensile strength, super corrosion resistance, high oxidation resistance and strong ductility. The length, width and height of the gabion 1 are 1.5m, 1.5m and 25cm respectively, and the aperture is 80mm*100mm. Each gabion 1 is connected by a hot-dip galvanized buckle 8.

[0036] like Figure 1 As shown, each gabion stone cage 1 is provided with an isolation layer for blocking the release of sediment pollutants to the overlying water body from bottom to top, an adsorption layer for absorbing heavy metals and N, P and other pollutants in the water body, and a planting layer for planting submerged plants 5 with a certain density.

[0037] The isolation layer includes a geomembrane 2 made of high-density polyethylene (HDPE), which is laid on the inner bottom of the gabion stone cage 1. The geomembrane 2 has the characteristics of high strength, corrosion resistance, and good anti-microbial performance. By arranging the geomembrane 2 on the inner bottom of the gabion stone cage 1, the release of sediment pollutants to the overlying water body can be effectively blocked to avoid damage from microorganisms and insects. In addition, since the geomembrane 2 is light and soft, it is easy to transport, lay, and construct.

[0038] like Figure 1 and Figure 2 As shown, the isolation layer also includes a material of 500g / m 2 Non-woven geotextile 6, and the length and width of the non-woven geotextile 6 are both 1.5m, the geotextile 6 is attached to the inner four walls of the gabion gabion 1, and the geotextile 6 is located between the geomembrane 2 and the gabion gabion 1, which can effectively prevent the water flow from scouring the modified filter material 3 and the planting soil 4, ensuring the structural integrity of the planting device of the submerged plant 5. Folding edges are provided between the geomembrane 2 and the gabion gabion 1, and between the geotextile 6 and the gabion gabion 1. There is an overlap between the geotextile 6 and the geomembrane 2 at the bottom of the gabion gabion 1 through the corresponding folding edges. The length of the overlap is greater than 10cm, which can prevent the filter material and the planting soil 4 from being taken away when the water flow scours the geotextile 6.

[0039] The adsorption layer is located on the geomembrane 2 of the isolation layer, and a modified filter material 3 with a thickness of 5-10 cm is laid in the adsorption layer; the type and properties of the modified filter material 3 are determined according to the type and concentration of pollutants in the sediment, and the pollutant content standard refers to the National Environmental Protection Standard of the People's Republic of China "Soil Environmental Quality Standard" (GB15618-1995): when the heavy metal content in the sediment exceeds the standard, the modified filter material 3 is attapulgite clay; when the nitrogen and phosphorus content in the sediment exceeds the standard, the modified filter material 3 is a zeolite porous adsorption material; when the organic pollutant content in the sediment exceeds the standard, the modified filter material 3 is a carbonaceous adsorbent.

[0040] The planting layer includes a planting soil layer and a coconut fiber layer, and the total thickness of the planting layer is 10-20 cm. In this embodiment, the planting soil layer is paved with a planting soil 4 with a thickness of 15 cm; and the coconut fiber layer is paved with coconut fiber 7 with a thickness of 5 cm.

[0041] Submerged plants 5 are planted in the planting layer, and the types of the submerged plants 5 are determined according to the water depth of rivers and lakes: when the water depth is 0.5-1m, the submerged plants 5 are dwarf Vallisneria; when the water depth is 1.0-1.5m, the submerged plants 5 are Potamogeton; when the water depth is 1.5-2m, the submerged plants 5 are Giant Algae or Duckweed.

[0042] The actual construction process of the utility model device at the project site includes:

[0043] S1. Place various materials required for the project, such as gabion cages 1, geomembrane 2, modified filter material 3, planting soil 4, submerged plants 5 and geotextile 6, at the project site.

[0044] S2. Geotextile 6 is laid around the inside of a gabion stone cage 1 with a length, width and height of 1.5m, 1.5m and 25cm respectively and a pore size of 80*100mm. The geotextile 6 is made of 500g / m2 non-woven geotextile 6, and the length and width of the non-woven geotextile 6 are 1.5m*1.5m.

[0045] S3. Lay geomembrane 2 at the bottom of gabion cage 1. The material of geomembrane 2 is high-density polyethylene (HDPE). At this time, the overlap length between non-woven geotextile 6 and geomembrane 2 needs to be greater than 10 cm, and geomembrane 2 is placed on geotextile 6.

[0046] S4, laying modified filter material 3, planting soil 4, and coconut fiber 7 layer by layer on the geomembrane 2:

[0047] S4-1. Lay 10 cm of modified filter material 3 on the geomembrane 2. The type and properties of the modified filter material 3 are determined according to the type and concentration of pollutants in the project site:

[0048] If the heavy metal content in the sediment exceeds the standard, the modified filter material 3 is attapulgite clay;

[0049] If the nitrogen and phosphorus content in the sediment exceeds the standard, the modified filter material 3 is a zeolite porous adsorption material;

[0050] If the content of organic pollutants in the sediment exceeds the standard, the modified filter material 3 is a carbonaceous adsorbent.

[0051] S4-2, laying planting soil 4 with a thickness of 15 cm on the modified filter material 3, and placing coconut fiber 7 with a thickness of 5 cm on the planting soil 4.

[0052] S5. Plant appropriate submerged plants5, such as Vallisneria, Foxtail Algae, Potamogeton serrata and Giant Algae, according to the depth, water quality, and flow rate of rivers and lakes:

[0053] If the water depth is 0.5-1m, plant dwarf Vallisneria;

[0054] If the water depth is 1.0-1.5m, plant Potamogeton;

[0055] If the water depth is 1.5-2m, plant giant kelp and duckweed.

[0056] The operation cycle of the submerged plant planting device for sealing bottom mud pollution in the utility model is 6 months. The water quality test results of the water body after 6 months of continuous operation at the project site are shown in Table 1.

[0057] Table 1 Water quality test results

[0058]

[0059] According to the above data, after using the submerged plant planting device for purification, the TN of the water body was reduced by 26%, TP was reduced by 47%, COD was reduced by 55%, and the water transparency was increased from 30cm to 70cm.

[0060] Among them, total nitrogen (TN) refers to the total amount of all nitrogen-containing compounds in the water body, and is an important indicator for evaluating the eutrophication of water bodies. The reduction of TN indicates that the nitrogen pollution in the water body has been effectively removed, which helps to reduce the eutrophication of water bodies and prevent the excessive reproduction of algae. This shows that the device can effectively reduce the risk of eutrophication of water bodies, promote the natural circulation and removal of nitrogen, and maintain the ecological balance of water bodies; total phosphorus (TP) is another key indicator for evaluating the eutrophication of water bodies. Phosphorus is a limiting element for the growth of algae in water bodies. A significant reduction in TP means that the phosphorus pollution in the water body has been effectively controlled, which helps to inhibit the excessive growth of algae. This shows that the device can effectively control the release of phosphorus, inhibit the excessive reproduction of algae, and maintain the purity of the water body. Clarity and stability; Chemical oxygen demand (COD) refers to the total amount of substances in the water that can be oxidized by strong oxidants. It is an important indicator reflecting the degree of organic pollution in the water. A significant reduction in COD indicates that the organic pollution in the water has been significantly alleviated and the water quality has been significantly improved, indicating that the device can effectively reduce the organic pollution load in the water and improve the self-purification capacity of the water. Water transparency is an important indicator for evaluating the clarity of water quality. The higher the transparency, the clearer the water quality. The significant improvement in water transparency means that the clarity of the water has been significantly improved, indicating that the device not only enhances the aesthetic value of the water and makes the visual effect more beautiful, but also improves the ecological environment of the water and provides better habitat conditions for aquatic organisms.

[0061] In summary, the data in Table 1 show that the submerged plant planting device in the utility model has a strong inhibitory effect on the release of sediment pollutants. At the same time, submerged plants have an improving effect on the transparency of water bodies, which helps to promote the recovery and balance of water ecology and improve the ecological environmental quality of water bodies. It has important ecological and environmental value.

[0062] The above description is only a preferred embodiment of the utility model, and is not intended to limit the utility model. It is known to those skilled in the art that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the utility model.

Claims

1. A submerged plant planting device for sealing sediment pollution, characterized in that: The invention comprises a plurality of gabion gabions (1), each of which is provided with an isolation layer for preventing sediment pollutants from being released to an overlying water body, an adsorption layer for absorbing heavy metals and N and P pollutants in the water body, and a planting layer for planting submerged plants (5) with a certain density from bottom to top, wherein the isolation layer comprises a geomembrane (2), and the geomembrane (2) is laid on the inner bottom of the gabion gabion (1); a modified filter material (3) is laid in the adsorption layer, and the modified filter material (3) is laid on the geomembrane (2); and the planting layer comprises a planting soil layer and a coconut fiber layer.

2. The submerged plant planting device for sealing sediment pollution according to claim 1 is characterized in that: The type and properties of the modified filter material (3) are determined according to the type and concentration of pollutants in the sediment: When the heavy metal content in the sediment exceeds the standard, the modified filter material (3) is attapulgite clay; When the nitrogen and phosphorus content in the sediment exceeds the standard, the modified filter material (3) is a zeolite porous adsorption material; When the content of organic pollutants in the sediment exceeds the standard, the modified filter material (3) is a carbonaceous adsorbent.

3. The submerged plant planting device for sealing sediment pollution according to claim 2 is characterized in that: The isolation layer also includes a geotextile (6), and the geotextile (6) is attached to the four inner walls of the gabion cage (1).

4. The submerged plant planting device for sealing sediment pollution according to claim 3 is characterized in that: There is an overlap between the geotextile (6) and the geomembrane (2), and the length of the overlap is greater than 10 cm.

5. The submerged plant planting device for sealing sediment pollution according to claim 1, characterized in that: The modified filter material (3) in the adsorption layer is laid with a thickness of 5-10 cm; the planting soil (4) and coconut fiber (7) in the planting layer are laid with a thickness of 10-20 cm.

6. The submerged plant planting device for sealing sediment pollution according to claim 1, characterized in that: The gabion stone cage (1) is an ecological grid structure, which is woven with thick galvanized low-carbon steel wire. The gabion stone cages (1) are connected by buckles (8).

7. The submerged plant planting device for sealing sediment pollution according to claim 6, characterized in that: The size of the gabion cage (1) is 1.5m*1.5m*25cm, and the hole diameter is 80mm*100mm.

8. The submerged plant planting device for sealing sediment pollution according to claim 1, characterized in that: The material of the geomembrane (2) is high-density polyethylene.

9. The submerged plant planting device for sealing sediment pollution according to claim 3, characterized in that: The geotextile (6) is made of 500g / m 2 A non-woven geotextile (6), wherein the size of the non-woven geotextile (6) is 1.5m*1.5m.

10. A submerged plant planting device for sealing sediment pollution according to any one of claims 1 to 9, characterized in that: The types of submerged plants (5) are determined according to the water depth of rivers and lakes: When the water depth is 0.5-1 m, the submerged plant (5) is a dwarf Vallisneria; When the water depth is 1.0-1.5 m, the submerged plant (5) is Potamogeton edulis; When the water depth is 1.5-2m, the submerged plant (5) is giant hydrilla or duckweed.

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