Method for in-situ remediation of organic pollution of soil based on spot catalysis

Abstract

The invention relates to a method for in-situ remediation of soil organic pollution based on point catalysis, which belongs to the soil remediation technology and comprises the following steps: (1) acquiring the soil pollution condition in a to-be-treated land parcel: acquiring the types and concentrations of organic pollutants at different depths of 0-25cm surface soil, and selecting a pollution depth f; (2) preparing a soil in-situ remediation device conforming to the pollution depth; the soil in-situ remediation device is composed of at least one top light gathering component and at least one cylindrical bottom container. Selecting and configuring a barrel-shaped bottom container and a light condensing part, enabling the barrel height of the barrel-shaped bottom container to be greater than the pollution depth f, enabling the focal length of the selected light condensing part to be the selected pollution depth f, arranging the light condensing part on the upper edge of the barrel-shaped bottom container, and enabling a focus point to fall into an inner cavity of the barrel-shaped bottom container; a reagent can be contained in the cylindrical bottom container, and a plurality of through holes are uniformly formed in the side wall of the cylindrical bottom container.

Description

Technical Field

[0001] The present invention relates to the field of soil organic pollution remediation, and in particular to a method for in-situ remediation of soil organic pollution based on point catalysis. Technical Background

[0002] With the advancement of industry and urbanization, people's lives are becoming more convenient, but pollution is also becoming more serious. Soil organic pollution cannot be ignored. Such organic pollutants usually include petroleum hydrocarbons, polycyclic aromatic hydrocarbons, halogenated hydrocarbons, pesticides, etc. They are toxic and can accumulate in the ecosystem for a long time to pollute the environment, and can also pose a threat to human health through the food chain.

[0003] Traditional soil organic pollution remediation technologies mainly include solidification / stabilization (using materials such as cement or lime to reduce the mobility of pollutants), thermal desorption (volatizing and separating pollutants by heating the soil), soil washing (physical removal of pollutants using water and detergents), chemical oxidation (using chemical oxidants such as ozone, hydrogen peroxide or Fenton's agent), bioremediation (covering biostimulation and bioenhancement), etc. These methods can effectively remove soil organic pollution, but they have high energy consumption, cumbersome operation, large workload, and the addition of treatment reagents may cause secondary pollution. In the field of soil organic pollution remediation, there is an urgent need for a soil organic pollution remediation technology that is simple to operate, low in energy consumption, and free of secondary pollution.

[0004] Based on the above reasons, the present application proposes a method for in situ remediation of soil organic pollution based on site catalysis. Summary of the invention

[0005] In view of the technical deficiencies of traditional methods, a soil organic pollution remediation technology with simple operation, low energy consumption and no secondary pollution is provided. The method is based on point catalytic in-situ degradation of organic pollutants in the soil, using a convex lens or its related equipment placed in the contaminated soil, and focusing under sunlight to achieve point catalytic degradation of organic pollutants in the soil.

[0006] The first aspect of the present invention is to provide a method for providing a customized soil in-situ remediation device, which is as follows:

[0007] (1) Obtain the soil pollution status of the land to be treated: obtain the types and concentrations of organic pollutants at different depths of the surface soil from 0 to 25 cm, and select a pollution depth f

[0008] (2) Prepare an in-situ soil remediation device that meets the above-mentioned contamination depth;

[0009] The soil in-situ remediation device is composed of at least one top light-collecting component and at least one cylindrical bottom container;

[0010] Select and configure a cylindrical bottom container and a focusing component so that the height of the cylindrical bottom container is greater than the contamination depth f, and the focal length of the selected focusing component is the above-selected contamination depth f, and the focusing component is arranged on the upper edge of the cylindrical bottom container and the focal point falls into the inner cavity of the cylindrical bottom container; the cylindrical bottom container can hold reagents, and a plurality of through holes are evenly arranged on its side wall for liquid to enter and exit.

[0011] Preferably, the focusing component is a biconvex lens, and the parameters of the selected lens satisfy the following equation:

[0012]

[0013] Where f is the focal length, n is the refractive index of the lens material, R1 and R2 are the radii of curvature of the two surfaces of the biconvex lens. Due to the relative arrangement, the value of R1 is a positive number and the value of R2 is a negative number;

[0014]

[0015] Or the focusing component is a water lens, and the curvature radii of the two surfaces of the water lens are equal, so the lens parameters satisfy the following equation:

[0016] Where f is the focal length, n is the refractive index of the water lens solution, and R is the radius of curvature of the lens surface.

[0017] Preferably, the cylindrical bottom container is conical or barrel-shaped.

[0018] Preferably, the through hole diameter on the side wall of the cylindrical bottom container is between 2 and 8 mm;

[0019] Preferably, the soil in-situ remediation device has a plurality of cylindrical bottom containers and corresponding top light-focusing components, and the plurality of cylindrical bottom containers form a row or an array.

[0020] One aspect of the present invention is to provide a soil remediation service, which is as follows:

[0021] A method for in-situ remediation of organic pollution in soil based on site catalysis, characterized in that it comprises the following steps:

[0022] (1) Obtain the soil pollution status of the land to be treated: obtain the types and concentrations of organic pollutants at different depths of the surface soil from 0 to 25 cm, and select a pollution depth f

[0023] (2) Constructing an in-situ soil remediation device;

[0024] The soil in-situ remediation device is composed of at least one top light focusing component and at least one cylindrical bottom container; and meets the following conditions:

[0025] The height of the cylindrical bottom container is greater than the above-selected pollution depth f, the focal length of the light-collecting component is the above-selected pollution depth f, and the light-collecting component is arranged at the upper edge of the cylindrical bottom container so that its focal point falls into the inner cavity of the cylindrical bottom container;

[0026] The cylindrical bottom container can hold reagents, and a plurality of through holes are evenly arranged on its side wall to facilitate the inflow and outflow of liquids;

[0027] (3) Installing the soil in-situ remediation device: placing at least one soil in-situ remediation device in the contaminated land to be treated, so that the cylindrical bottom container is buried in the soil, and the focusing component is placed on the soil surface to ensure that sunlight can fully irradiate the surface and be focused in the cylindrical bottom container;

[0028] (4) Start in situ soil remediation: operate under light and keep the contaminated soil at the treatment point moist.

[0029] Preferably, step (4) also includes detecting the reduction in the concentration of organic pollutants in the soil after a period of restoration to determine whether the soil is suitable for treatment.

[0030] Certainly

[0031] The length of remediation time, the number and density of in-situ soil remediation devices placed.

[0032] Preferably, the method further comprises step (5): selecting different contamination depths and repeating (2) to (4) to obtain

[0033] Ideal repair effect.

[0034] Preferably, the focusing component is a biconvex lens, and the parameters of the selected lens satisfy the following equation:

[0035]

[0036] Where f is the focal length, n is the refractive index of the lens material, R1 and R2 are the radii of curvature of the two surfaces of the biconvex lens. Due to the relative arrangement, the value of R1 is a positive number and the value of R2 is a negative number;

[0037]

[0038] Or the focusing component is a water lens, and the curvature radii of the two surfaces of the water lens are equal, so the lens parameters satisfy the following equation: where f is the focal length, n is the refractive index of the water lens solution, and R is the curvature radius of the lens surface, which is a positive number.

[0039] Preferably, the cylindrical bottom container is conical or barrel-shaped; the diameter of the through holes on the side wall of the cylindrical bottom container is between 2 and 8 mm.

[0040] Preferably, the selected contamination depth f refers to the depth where the contamination degree is the most serious.

[0041] Preferably, in the above solution of the present invention, the material of the cylindrical bottom container is a corrosion-resistant material, such as glass or plastic.

[0042] Preferably, the connection method of the cylindrical bottom container and the focusing component can be snap-fitting or welding, and snap-fitting is preferred for ease of installation and disassembly;

[0043] Preferably, the shell material of the water lens in the present invention can be a flat transparent material, such as transparent hard plastic.

[0044] Based on the principle of photocatalytic degradation of organic matter, the present invention designs a customizable soil in-situ remediation device and remediation method, which has the following advantages:

[0045] 1. Easy to operate, no additives, no energy consumption, reusable, in line with the principle of economic rationality;

[0046] 2. According to the preliminary survey results or the soil pollution data provided by the user, the focusing components - convex lenses with different refractive indices can be selected and customized to adjust the burial depth of the device, so as to repair soil organic pollution at different depths;

[0047] 3. The cylindrical bottom container can hold catalysts. Catalysts of different properties can be placed to deal with different organic pollutants, and different types of soil organic pollutants can be degraded;

[0048] 4. The main energy source is sunlight, which is energy-saving, environmentally friendly and has wide adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 .In the in-situ repair device of the present invention, the cylindrical bottom container is conical or barrel-shaped;

[0050] Figure 2 . Schematic diagram of the repair principle of the in-situ repair device in the method of the present invention;

[0051] Figure 3 . The process of the method for in-situ remediation of organic soil pollution based on point catalysis of the present invention:

[0052] Where F is the focusing point of the focusing component, and f is the selected pollution depth which is also the focal length of the focusing component. DETAILED DESCRIPTION

[0053] The following is an exemplary embodiment to illustrate the working principle and effect of the method provided by the present invention.

[0054] In the embodiments of the present invention, it involves measuring the types and concentrations of soil organic pollutants. The concentration of organic pollution can be directly measured based on the pollution information of the measured plot; and in the case of unknown organic pollutants, the national standard HJ 911-2017 7 Extraction of organic matter in soil and sediment ultrasonic extraction method can be used to extract organic pollutants in the soil, and the relevant standards of each soil series in the Chinese ecological environment standard can be used for detection to confirm the types and concentrations of soil organic pollutants. In short, the detection of soil organic pollutants belongs to the conventional technical means in this field, so it will not be described in detail in the implementation plan.

[0055] The glass convex lens or water lens involved in the solution of the present invention is also a conventional material and can be easily obtained after setting the parameters.

[0056] Based on the description of the present invention, it is also easy for those skilled in the art to prepare or purchase the cylindrical bottom container constituting the in-situ repair device and realize the assembly between the lens and the cylindrical bottom container without any technical obstacles.

[0057] Example 1

[0058] (1) Randomly take soil samples from the plot to be treated and test for organic pollutants. The test results show that the soil is contaminated by methyl orange. The concentration of contamination is 30 mg / L (referring to the concentration of organic matter in the soil sample extract), and the most serious contamination depth is 5 cm;

[0059] (2) Select a lens with a focal length of 5 cm. The selected glass biconvex lens can satisfy the lens maker's equation.

[0060]

[0061] In this scheme, the refractive index of the selected lens glass material is 1.5, the diameter of the double convex lens is 100mm, and the calculated curvature radius needs to be 200mm; that is, f is the focal length 5cm, n is the refractive index of the lens material 1.5, and R1 and R2 are the curvature radii of the two surfaces of the lens, which are 200mm and -200mm respectively.

[0062] (3) A cylindrical bottom container made of plastic material is selected, the height of the cylinder is 15 cm, and a through hole with a diameter of 6 mm is set on the side wall; a titanium dioxide catalyst is placed in the cylindrical bottom container; a limiting groove is set around the upper opening of the cylindrical bottom container for placing and fixing the double convex lens, thereby forming an in-situ repair device;

[0063] (4) placing the in-situ remediation device in the contaminated soil to be treated so that its cylindrical bottom container is completely buried in the soil and the upper lens is kept on the ground without being blocked so that sunlight can fully illuminate its surface;

[0064] (5) After a week of continuous placement, the soil around the device was collected to test the methyl orange concentration. The results showed that the methyl orange concentration in the soil was 5 mg / L after about 20 days of placement, and the removal rate was 83.3%.

[0065] Example 2

[0066] (1) Soil samples were randomly taken from the plots to be treated and tested for organic pollutants. The test results showed that the soil was contaminated with rhodamine B at a concentration of 20 mg / L, and the most serious contamination depth was 4 cm;

[0067] (2) Select a water lens with a focal length of 4 cm. The selected water lens is a biconvex lens, and the other parameters meet the lens maker's equation;

[0068]

[0070] In this scheme, the refractive index of the water lens is 1.33, the diameter of the biconvex lens is 150 mm, and the radius of curvature is 242.4 mm, where f is the focal length 4 cm, the refractive index n of the lens material is 1.33, and R is the radius of curvature, which is 242.4 mm.

[0071] (3) Select a plastic cylindrical bottom container with a height of 15 cm and a through hole with a diameter of 8 mm on the side wall; place a titanium dioxide catalyst at the bottom to form an in-situ repair device with the selected water lens;

[0072] (4) placing the in-situ remediation device in the contaminated soil to be treated so that its cylindrical bottom container is completely buried in the soil and the upper lens is kept on the ground without being blocked so that sunlight can fully illuminate its surface;

[0073] (5) After one week of continuous placement, the soil around the device was collected to test the methyl orange concentration. The results showed that the concentration of rhodamine B in the soil was 4 mg / L after about 20 days of placement, and the removal rate was 80%.

[0074] Example 3

[0075] (1) Randomly take soil samples from the plot to be treated and test for organic pollutants; the test results show that it is contaminated with rhodamine B, with a concentration of 40 mg / L and a depth of about 6 cm;

[0076] (2) According to the lens maker's equation, the focal length is 6 cm, a water lens is selected, the diameter of the biconvex lens is 150 mm, the radius of curvature is 100 mm, and a solvent with a refractive index of 1.3333 needs to be injected;

[0077] (3) Prepare a solution with a refractive index of 1.3333 using sodium chloride. The calculation method of solution concentration and refractive index is as follows:

[0078] n=a+Δn*c, wherein n is the refractive index, c is the solution concentration, and Δn is the refractive index change rate. The measurement method of the refractive index change rate Δn of sodium chloride refers to the description in patent CN113466176 B.

[0079] (4) Select a cylindrical bottom container made of plastic material, with a height of 20 cm and a through hole of 2 mm in diameter on the side wall; place a titanium dioxide catalyst at the bottom to form an in-situ repair device with the selected water lens;

[0080] (5) placing the in-situ remediation device in the contaminated soil to be treated so that its cylindrical bottom container is completely buried in the soil and the upper lens is kept on the ground without being blocked so that sunlight can fully illuminate its surface;

[0081] (6) After being placed for a week, the soil around the device was collected to test the methyl orange concentration. The results showed that the rhodamine B concentration in the soil was 10 mg / L after being placed for about 20 days, and the removal rate was 75%.

Claims

1. A method for providing a customized soil in-situ remediation device, characterized in that: The steps include: (1) Obtaining the soil pollution status of the land to be treated: Obtaining the types and concentrations of organic pollutants at different depths of 0 to 25 cm in the surface soil, and selecting a pollution depth f; (2) Prepare an in-situ soil remediation device that meets the above-mentioned contamination depth; The soil in-situ remediation device is composed of at least one top light-collecting component and at least one cylindrical bottom container; Select and configure a cylindrical bottom container and a focusing component so that the height of the cylindrical bottom container is greater than the contamination depth f, and the focal length of the selected focusing component is the above-selected contamination depth f, and the focusing component is arranged on the upper edge of the cylindrical bottom container and the focal point falls into the inner cavity of the cylindrical bottom container; the cylindrical bottom container can hold reagents, and a plurality of through holes are evenly arranged on its side wall for liquid to enter and exit.

2. According to the method of claim 1, the focusing component is a biconvex lens, and the parameters of the selected lens satisfy the following equation: Where f is the focal length, n is the refractive index of the lens material, R1 and R2 are the radii of curvature of the two surfaces of the biconvex lens. Due to the relative arrangement, the value of R1 is a positive number and the value of R2 is a negative number; Or the focusing component is a water lens, and the curvature radii of the two surfaces of the water lens are equal, so the lens parameters satisfy the following equation: Where f is the focal length, n is the refractive index of the water lens solution, and R is the radius of curvature of the lens surface.

3. The method according to claim 1, wherein the cylindrical bottom container is conical or barrel-shaped.

4. The method according to claim 1, wherein the diameter of the through holes on the side wall of the cylindrical bottom container is between 2 and 8 mm.

5. The method according to any one of claims 1 to 4, wherein the soil in-situ remediation device has a plurality of cylindrical bottom containers and corresponding top focusing components, and the plurality of cylindrical bottom containers form a row or an array.

6. A method for in-situ remediation of organic soil pollution based on site catalysis, characterized in that: The steps include: (1) Obtaining the soil pollution status of the land to be treated: Obtaining the types and concentrations of organic pollutants at different depths of 0 to 25 cm in the surface soil, and selecting a pollution depth f; (2) Constructing an in-situ soil remediation device; The soil in-situ remediation device is composed of at least one top light focusing component and at least one cylindrical bottom container; and meets the following conditions: The height of the cylindrical bottom container is greater than the above-selected pollution depth f, the focal length of the light-collecting component is the above-selected pollution depth f, and the light-collecting component is arranged at the upper edge of the cylindrical bottom container so that its focal point falls into the inner cavity of the cylindrical bottom container; The cylindrical bottom container can hold reagents, and a plurality of through holes are evenly arranged on its side wall to facilitate the inflow and outflow of liquids; (3) Installing the soil in-situ remediation device: placing at least one soil in-situ remediation device in the contaminated land to be treated, so that the cylindrical bottom container is buried in the soil, and the focusing component is placed on the soil surface to ensure that sunlight can fully irradiate the surface and be focused in the cylindrical bottom container; (4) Start in situ soil remediation: operate under light and keep the contaminated soil at the treatment point moist.

7. According to the method of claim 6, step (4) also includes detecting the reduction in the concentration of organic pollutants in the soil after a period of remediation to determine the length of the remediation time and the number and density of the soil in-situ remediation devices.

8. The method according to claim 6 further comprises step (5): selecting different contamination depths and repeating (2) to (4) to obtain an ideal repair effect.

9. The method according to claim 7, wherein the light focusing component is a biconvex lens, and the parameters of the selected lens satisfy the following equation: Where f is the focal length, n is the refractive index of the lens material, R1 and R2 are the radii of curvature of the two surfaces of the biconvex lens. Due to the relative arrangement, the value of R1 is a positive number and the value of R2 is a negative number; Or the focusing component is a water lens, and the curvature radii of the two surfaces of the water lens are equal, so the lens parameters satisfy the following equation: Where f is the focal length, n is the refractive index of the water lens solution, and R is the radius of curvature of the lens surface.

10. The method according to claim 5, wherein the cylindrical bottom container is conical or barrel-shaped; the through hole diameter on the side wall of the cylindrical bottom container is between 2 and 8 mm; preferably, the selected contamination depth f refers to the depth with the most serious contamination. Preferably, in the above solution of the present invention, the material of the cylindrical bottom container is a corrosion-resistant material, such as glass or plastic; Preferably, the connection method of the cylindrical bottom container and the light-collecting component can be snap-fitting or welding; Preferably, the shell material of the water lens can be a flat transparent material, such as transparent hard plastic.

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