In-situ enhanced risk management structure for contaminated sites
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIAONING BEIFANG ENVIRONMENTAL PROTECTION
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional contaminated site remediation technologies suffer from over-remediation, high energy consumption, high costs, and a high risk of secondary pollution. Furthermore, active control or in-situ barrier technologies alone cannot effectively reduce the toxicity of pollutants.
Construct an in-situ enhanced risk management structure for contaminated sites, including an active prevention layer, a vertical barrier layer, and a horizontal barrier layer. Combined with a long-term monitoring system, a sealed ring structure is formed through in-situ solidification/stabilization, bioremediation, and chemical oxidation treatment to block pollutant exposure pathways. Risk isolation is achieved by using a combination of different materials and technologies.
It has achieved economically feasible and effective pollutant risk management, reduced the risk of pollutant migration, ensured the safe use of soil environment, and avoided resource waste and environmental damage.
Smart Images
Figure CN224487133U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field, specifically to an in-situ enhanced risk management structure for contaminated sites. Background Technology
[0002] With my country's rapid economic development, especially in the early stages of development when industrial structure and layout were not entirely rational, the total amount of pollutant emissions was high. Soil, as the final recipient of most pollutants, has been significantly affected in terms of environmental quality, resulting in serious soil pollution problems. While the country has attached great importance to soil pollution prevention and remediation, and the level of pollution risk management and remediation has been continuously improving, in practice, problems such as over-remediation, high energy consumption, high costs, and the looming risk of secondary pollution in traditional remediation processes have led to resource waste and environmental damage. Especially in recent years, with the real estate market slowing down, the traditional high-cost, high-investment large-scale remediation model is no longer sustainable.
[0003] In recent years, compared with traditional remediation technologies, risk management technologies have become the main means of soil remediation for contaminated sites due to their advantages such as high cost-effectiveness, strong practicality, and good operability. Active prevention and control technologies and in-situ barrier control technologies can effectively control the pollution risk of soil by cutting off the exposure pathways of contaminated soil, thus enabling the safe use of remediation sites. However, active prevention and control technologies alone are costly and pose a high risk of secondary pollution; while in-situ barrier control technologies alone cannot effectively reduce the toxicity of pollutants.
[0004] Therefore, the applicant recognizes that, in light of the needs of contaminated site scenarios and the concept of green and low-carbon development, there is an urgent need to construct an in-situ enhanced risk management structure that integrates proactive prevention and control with risk management, and is technically feasible, risk-controllable, and economically acceptable. Utility Model Content
[0005] Therefore, this utility model provides an in-situ enhanced risk management structure for contaminated sites to solve the problems existing in the above-mentioned technologies.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] An in-situ enhanced risk management structure for contaminated sites includes:
[0008] An active prevention and control layer is set up in the high-risk pollution area of the contaminated soil surface. The active prevention and control layer is formed by selecting in-situ solidification / stabilization, in-situ bioremediation, and in-situ chemical oxidation low-cost treatment for a certain thickness of contaminated soil surface.
[0009] The risk control layer includes a vertical barrier layer and a horizontal barrier layer, which, together with institutional controls, block the exposure pathways of pollutants to the surrounding environment, achieving risk isolation. The vertical barrier layer forms a sealed ring structure around the contaminated soil, separating the area around the contaminated soil from the surrounding clean soil, and the bottom of the vertical barrier layer is embedded in an underground weakly permeable layer. The horizontal barrier layer is laid on top of the active control layer, separating the surface area of the contaminated soil from the surrounding environment, while preventing rainwater intrusion and pollutant migration. The long-term monitoring system uses monitoring wells to dynamically monitor whether pollutants infiltrate the site.
[0010] The aforementioned proactive prevention and control layer selects different treatment technologies based on different types of pollution sites. For sites contaminated with heavy metals, in-situ solidification / stabilization treatment or in-situ bioremediation is selected; for sites contaminated with organic pollutants, in-situ bioremediation or in-situ chemical oxidation treatment is selected.
[0011] Optionally, multiple vertical barrier layers are provided, which are arranged around the contaminated soil and connected end to end to form a sealed annular structure.
[0012] Optionally, the vertical barrier layer is set in two sections with the strongly weathered bedrock as the dividing line, and the vertical barrier layer is embedded 0-2m into the underground weakly permeable layer.
[0013] Optionally, the horizontal barrier layer consists of an impermeable layer, a protective layer, and a covering layer arranged sequentially from bottom to top.
[0014] The above-mentioned impermeable layers are selected in different forms according to different types of pollutants. When the pollutants are not volatile, a membrane structure is selected for the horizontal barrier layer; when the pollutants are volatile, a composite structure is selected for the horizontal barrier layer to prevent the leakage of volatiles.
[0015] Optionally, the impermeable layer is a membrane structure or a composite structure that prevents volatiles from overflowing.
[0016] Optionally, the membrane structure is an HDPE geomembrane with a permeability coefficient of less than or equal to 10. -7 cm / s;
[0017] The composite structure is a two-component modified asphalt material layer with a thickness of 1.5 mm, which has the functions of waterproofing and preventing vapor leakage.
[0018] Optionally, the protective layer is a non-woven geotextile.
[0019] Optionally, the covering layer may be one or more of the following, depending on the different use scenarios of the site: plain soil layer, planting soil layer, or reinforced concrete layer, and the thickness of the covering layer is 200-500mm.
[0020] Optionally, it also includes a long-term monitoring system, which comprises at least three monitoring wells;
[0021] One of them is located inside the area enclosed by the vertical barrier layer, and the other two are located outside the vertical barrier layer, in the upstream and downstream areas of the groundwater, respectively.
[0022] The monitoring wells are located above the weakly permeable layer.
[0023] This utility model has at least the following beneficial effects:
[0024] This invention separates contaminated soil from clean soil by setting up a vertical barrier layer embedded in an underground permeable layer. Then, the surface contaminated soil is solidified and stabilized to form an active prevention and control layer, creating a relatively stable isolation structure on the surface of the contaminated soil area. This separates the contaminated soil from the clean soil and the surrounding environment. The above ground space can then be used to isolate the contaminated soil in situ, thus strengthening the risk management of heavy metal contaminated soil. Attached Figure Description
[0025] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.
[0026] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0027] Figure 1 This is a cross-sectional schematic diagram of the barrier structure according to an embodiment of the present invention.
[0028] Explanation of reference numerals in the attached figures:
[0029] 1. Vertical barrier layer; 2. Active control layer; 3. Horizontal barrier layer; 31. Covering layer; 32. Protective layer; 33. Impermeable layer; 4. Monitoring well; 5. Underground weakly permeable layer. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0031] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," "fourth," etc. (if present), in the specification, claims, and accompanying drawings of this utility model are intended to distinguish the objects they refer to. For solutions with a sequential flow, this terminology need not be interpreted as describing a specific order or sequence; for solutions with device structures, this terminology does not distinguish between matters of importance or positional relationships.
[0032] Furthermore, the terms “comprising,” “having,” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may also include other steps or units that are not expressly listed but are inherent to these processes, methods, products, or devices, or steps or units added based on further optimizations of the inventive concept.
[0033] like Figure 1 As shown, this utility model discloses an in-situ enhanced risk management structure for contaminated sites, comprising:
[0034] Active control layer 2 is set in the high-risk pollution area of the surface soil. It is formed by selecting in-situ solidification / stabilization, in-situ bioremediation, and in-situ chemical oxidation low-cost treatment for a certain thickness of polluted soil on the surface.
[0035] The risk control layer includes a vertical barrier layer 1, a horizontal barrier layer 3, and institutional controls to block the exposure pathways of pollutants to the surrounding environment and achieve risk isolation. The vertical barrier layer 1 forms a sealed ring structure around the contaminated soil, separating the area around the contaminated soil from the surrounding clean soil, and the bottom of the vertical barrier layer 1 is embedded in an underground weakly permeable layer 5. The horizontal barrier layer 3 is laid on top of the active control layer 2 to separate the surface area of the contaminated soil from the surrounding environment, while preventing rainwater intrusion and pollutant migration. The long-term monitoring system uses monitoring wells 4 to dynamically monitor whether pollutants infiltrate the site.
[0036] The aforementioned vertical barrier layer 1 can be a one-piece structure or a split structure. Multiple vertical barrier structures are connected in sequence to form a ring area. The size of the ring area formed by the vertical barrier layer 1 is at least enough to completely separate the contaminated soil from the clean soil. In the vertical direction, the bottom of the vertical barrier layer 1 should be embedded with an underground weakly permeable layer 5 to prevent pollutants from seeping into the surrounding area. The specific thickness of the embedded layer is 0-2m.
[0037] The vertical barrier layer 1 is constructed in two sections, based on the varying strength of the underlying soil. Using strongly weathered bedrock as the boundary, the lower section of the vertical barrier layer 1, inserted into the strongly, moderately, and weakly weathered bedrock, is constructed using curtain grouting. The upper section of the vertical barrier layer 1, embedded in the soil layer, is constructed using triaxial mixing piles or high-pressure jet grouting. The wall thickness of the vertical barrier layer 1 is 850mm, and it is positioned at the boundary of the contaminated area to form a closed structure. The wall permeability coefficient is required to be no greater than 10. -6 cm / s,
[0038] The active prevention and control layer 2 selects different treatment technologies based on different types of pollution sites. For sites contaminated with heavy metals, in-situ solidification / stabilization treatment or in-situ bioremediation is selected; for sites contaminated with organic pollutants, in-situ bioremediation or in-situ chemical oxidation treatment is selected.
[0039] In a further embodiment, in order to improve the barrier effect at the ground surface, a horizontal barrier layer 3 is also included, which is laid on top of the active prevention and control layer 2.
[0040] By setting a horizontal barrier layer 3 above the active prevention layer 2, the contaminated soil is further separated from the ground.
[0041] Specifically, the horizontal barrier layer 3 includes a cover layer 31, a protective layer 32, and an impermeable layer 33 arranged sequentially from top to bottom, wherein the impermeable layer 33 is in contact with the active control layer 2, and the cover layer 31 serves as the surface layer.
[0042] The horizontal barrier layer 3 is provided with a three-layer structure, wherein the seepage prevention layer 33 is located at the bottom and contacts the active control layer 2, the protective layer 32 is located above the seepage prevention layer 33 to protect the seepage prevention layer 33, and the covering layer 31 covers the protective layer 32.
[0043] It should be noted that the protective layer 32 can also be set on the upper and lower sides of the impermeable layer 33 to further protect the impermeable layer 33 and prevent it from being damaged.
[0044] In one specific embodiment, the protective layer 32 has a strength of 600 g / m³. 2 Geotextile layer;
[0045] The aforementioned geomembrane 33 is selected in different forms depending on the type of pollutant. When the pollutant is not volatile, the horizontal barrier layer 3 uses a membrane structure; when the pollutant is volatile, the horizontal barrier layer 3 uses a composite structure to prevent the leakage of volatiles. The membrane structure is an HDPE geomembrane with a permeability coefficient less than or equal to 10. -7 cm / s; the composite structure is a two-component modified bitumen material layer with a thickness of 1.5mm, which has the functions of waterproofing and preventing vapor overflow.
[0046] The covering layer 31 is a plain fill layer, a planting soil layer, or a reinforced concrete layer, and the thickness of the covering layer 31 is 200-500mm.
[0047] The covering layer 31 can be configured with different structures according to the usage requirements of the ground area. It should be noted that, for planting areas, after laying the planting soil layer, the planted plants should be shallow-rooted plants to avoid the plant roots and stems puncturing the protective layer 32 and the impermeable layer 33.
[0048] In a further embodiment, at least three monitoring wells 4 are also included;
[0049] One of them is located inside the area enclosed by the vertical barrier layer 1, and the other two are located upstream and downstream of the groundwater outside the vertical barrier layer 1, respectively.
[0050] The monitoring well 4 is located above the weakly permeable layer.
[0051] By setting up a monitoring well 4 within the area enclosed by the vertical barrier layer 1, and setting up another monitoring well 4 outside the area enclosed by the vertical barrier layer 1, and at locations upstream and downstream of the groundwater, the pollutant content in the groundwater can be monitored to determine whether pollutant seepage has occurred.
[0052] The above specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.
[0053] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.
[0054] The present invention has been described in a relatively specific and detailed manner above through general description and specific embodiments. It should be noted that, without departing from the concept of the present invention, various modifications and improvements can be made to these specific embodiments, all of which fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.
Claims
1. A structure for in-situ enhanced risk management of contaminated sites, characterized in that, include: An active prevention and control layer is set in a high-risk pollution area on the surface of contaminated soil, and an active prevention and control layer is formed by in-situ treatment of a certain thickness of contaminated soil on the surface. The risk control layer includes a vertical barrier layer and a horizontal barrier layer. The vertical barrier layer forms a sealed ring structure around the contaminated soil, separating the area around the contaminated soil from the surrounding clean soil. The bottom of the vertical barrier layer is embedded in an underground weakly permeable layer. The horizontal barrier layer is laid on top of the active control layer to separate the contaminated soil surface area from the surrounding environment.
2. The in-situ enhanced risk management structure for contaminated sites according to claim 1, characterized in that: Multiple vertical barrier layers are provided, which are arranged around the contaminated soil and connected end to end to form a sealed ring structure.
3. The in-situ enhanced risk management structure for contaminated sites according to claim 1, characterized in that: The vertical barrier layer is set in two sections with the strongly weathered bedrock as the dividing line, and the vertical barrier layer is embedded 0-2m into the underground weakly permeable layer.
4. The in-situ enhanced risk management structure for contaminated sites according to claim 1, characterized in that: The horizontal barrier layer consists of an impermeable layer, a protective layer, and a covering layer arranged sequentially from bottom to top.
5. The in-situ enhanced risk management structure for contaminated sites according to claim 4, characterized in that: The impermeable layer is a membrane structure or a composite structure that prevents volatile substances from overflowing.
6. The in-situ enhanced risk management structure for contaminated sites according to claim 5, characterized in that: The membrane structure is an HDPE geomembrane with a permeability coefficient of less than or equal to 10. -7 cm / s; The composite structure is a two-component modified asphalt material layer with a thickness of 1.5 mm.
7. The in-situ enhanced risk management structure for contaminated sites according to claim 4, characterized in that: The protective layer is a non-woven geotextile.
8. The in-situ enhanced risk management structure for contaminated sites according to claim 4, characterized in that: The covering layer is a plain soil layer, a planting soil layer, or a reinforced concrete layer, and the thickness of the covering layer is 200-500mm.
9. The in-situ enhanced risk management structure for contaminated sites according to claim 1, characterized in that: It also includes a long-term monitoring system, which comprises at least three monitoring wells; One of them is located inside the area enclosed by the vertical barrier layer, and the other two are located outside the vertical barrier layer, in the upstream and downstream areas of the groundwater, respectively. The monitoring wells are located above the weakly permeable layer.