A method for oxidatively degrading pollutants in soil by catalyzing chlorine dioxide using sodium bicarbonate to activate amorphous manganese dioxide

Abstract

The present invention relates to a method for oxidatively degrading pollutants in soil by catalyzing chlorine dioxide using sodium bicarbonate-activated amorphous manganese dioxide. The method comprises mixing a chlorine dioxide solution as an oxidizing agent, amorphous manganese dioxide as a catalytic agent, and sodium bicarbonate as an activator with the contaminated soil for degradation and remediation. Compared to the prior art, the present invention utilizes a catalyst using sodium bicarbonate as an activator and amorphous manganese dioxide as an active component to catalyze the oxidative degradation of polycyclic aromatic hydrocarbons (PAHs) in the contaminated soil using chlorine dioxide, effectively improving the PAH degradation efficiency of chlorine dioxide. Furthermore, manganese dioxide and sodium bicarbonate are both abundant in natural environments, readily available and inexpensive, preventing secondary soil pollution and resulting in a cleaner and more environmentally friendly environment.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a method for oxidatively degrading pollutants in soil by catalyzing chlorine dioxide using sodium bicarbonate to activate amorphous manganese dioxide. Background Art

[0002] With the development of industry, large quantities of polycyclic aromatic hydrocarbons (PAHs), an organic pollutant, have accumulated in industrial soils, creating an increasingly serious pollution problem that urgently requires remediation. PAHs are persistent organic pollutants with "triple effects," high emissions, and are difficult to degrade. Furthermore, due to their lipophilic and hydrophobic properties and excellent stability, PAHs are easily adsorbed and retained in soil and crops for long periods of time. Over 90% of PAHs in the environment are concentrated in soil. PAHs also deposit rapidly in soil and sediments due to their high hydrophobicity, low vapor pressure, and water solubility. Therefore, they adhere tightly to soil particles, continuously accumulating in the soil and increasing their concentration, ultimately concentrating within the soil ecosystem. Crops, as a major food source, absorb PAHs from the soil and accumulate them in their bodies. These PAHs then pass through the food chain, ultimately endangering human health.

[0003] Currently, the remediation technologies for PAH-contaminated soil include physical remediation, chemical remediation, and bioremediation. Physical remediation technologies primarily include steam extraction, supercritical extraction, and thermal desorption. While the advantage of physical remediation is its simplicity, they also have significant disadvantages: they only temporarily remove or transfer pollutants and require secondary treatment. Chemical remediation technologies, such as photocatalytic degradation and advanced oxidation technologies, offer high degradation efficiency and short degradation cycles. Bioremediation involves transferring, adsorbing, or degrading pollutants through the metabolic activities of plants or microorganisms. While these technologies are low-cost and environmentally friendly, they are significantly affected by soil quality and environmental factors, resulting in lower degradation efficiency for high-concentration pollutants and a longer remediation cycle.

[0004] Patent publication number CN111922064A discloses a method for catalytic chlorine dioxide oxidation degradation of pollutants in soil, comprising: S1: sampling the target soil containing the pollutants to be degraded and detecting the total amount of organic pollutants in the soil; S2: preparing an oxidizing agent and a catalytic agent Mn according to the total amount of organic pollutants detected in the soil. 2+ Solution; S3: oxidizing agent and catalytic agent Mn 2+ The solution is applied to the target soil where the pollutants are to be degraded for soil degradation and remediation. 2+ The base catalyst improves the degradation efficiency of chlorine dioxide on polycyclic aromatic hydrocarbons. The oxidative degradation system can repair 56.7%~77.9% of polycyclic aromatic hydrocarbons in contaminated soil, and the repair efficiency is relatively low. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a method for oxidative degradation of pollutants in soil by catalyzing chlorine dioxide using amorphous manganese dioxide activated by sodium bicarbonate. The catalyst using sodium bicarbonate as an activator and amorphous manganese dioxide as an active component catalyzes the oxidative degradation of polycyclic aromatic hydrocarbons in contaminated soil by chlorine dioxide, effectively improving the degradation efficiency of chlorine dioxide for polycyclic aromatic hydrocarbons. At the same time, manganese dioxide and sodium bicarbonate themselves are abundant in the natural environment, cheap and easy to obtain, will not cause secondary pollution to the soil, and are cleaner and more environmentally friendly.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A method for oxidatively degrading pollutants in soil by activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide, comprising mixing an oxidizing agent, a chlorine dioxide solution, a catalytic agent, amorphous manganese dioxide, and an activating agent, with the contaminated soil for degradation and remediation treatment.

[0008] Furthermore, the contaminated soil is soil contaminated by polycyclic aromatic hydrocarbons.

[0009] Furthermore, the contaminated soil was first sampled and detected to contain a total amount of polycyclic aromatic hydrocarbons (PAHs) pollutants of 2092 mg / kg.

[0010] Furthermore, the polycyclic aromatic hydrocarbons in the contaminated soil are extracted and then detected using an extraction solvent, and the extraction solvent is n-hexane and / or dichloromethane.

[0011] Furthermore, the contaminated soil is crushed and screened before extraction.

[0012] Furthermore, the contaminated soil is crushed and sieved to a particle size of ≤0.25 mm before extraction.

[0013] Furthermore, the polycyclic aromatic hydrocarbons are one or more of naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, indeno[1,2,3-cd]pyrene, dibenzo[a,h]anthracene or benzo[g,h,i]perylene.

[0014] Furthermore, the ratio of the sum of the mass of the oxidizing agent chlorine dioxide solution and the catalytic agent amorphous manganese dioxide, the mass of the activating agent sodium bicarbonate and the mass of the polycyclic aromatic hydrocarbons in the contaminated soil is (2-22): (1-3):1.

[0015] Furthermore, the mass ratio of the oxidizing agent chlorine dioxide solution to the catalytic agent amorphous manganese dioxide is (5-15):1, preferably 10:1.

[0016] Furthermore, during the degradation and remediation process of contaminated soil, the concentration of chlorine dioxide is 1000~3000 mg / L, the mass of amorphous manganese dioxide is 0.0016~0.0040g, and the mass of sodium bicarbonate is 0.0010~0.0030g.

[0017] Furthermore, during the specific operation process, the ratio of the added oxidizing agent to the catalytic agent and the activating agent should be linearly increased or decreased according to the measured concentration of the polycyclic aromatic hydrocarbons pollutants.

[0018] Furthermore, during the specific operation process, according to the total mass of polycyclic aromatic hydrocarbons detected in the contaminated soil, the addition amount of the oxidizing agent and the catalytic agent amorphous manganese dioxide is linearly increased or decreased within the mass ratio range of (2~22):1, and the addition amount of the activating agent sodium bicarbonate is linearly increased or decreased within the mass ratio range of (1~3):1.

[0019] Furthermore, the mixing method of the oxidizing agent chlorine dioxide solution, the catalytic agent amorphous manganese dioxide and the activating agent sodium bicarbonate with the contaminated soil is one or a combination of spraying, drip irrigation, stirring mixing and shaking mixing.

[0020] Furthermore, the method comprises the following steps:

[0021] S1: Sampling, crushing, screening, extraction and detection of the total amount of PAHs in the contaminated soil;

[0022] S2: preparing chlorine dioxide as an oxidizing agent, amorphous manganese dioxide as an activating agent, and sodium bicarbonate as a catalytic agent according to the detected concentration of polycyclic aromatic hydrocarbons;

[0023] S3: Apply chlorine dioxide, an oxidizing agent, amorphous manganese dioxide, a catalytic agent, and sodium bicarbonate, an activating agent, to the contaminated soil containing polycyclic aromatic hydrocarbons to perform soil degradation and remediation.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) Bicarbonate has a positive effect on the catalytic activity of manganese dioxide. The catalytic performance of manganese dioxide is related to the Mn(III) content in manganese dioxide. However, Mn(III) is unstable and easily undergoes disproportionation reaction. Bicarbonate adsorption mainly occurs at the edge of Mn(III) in manganese dioxide, which can improve the stability of Mn(III) and prevent its disproportionation to form Mn(II) and Mn(IV). Therefore, during the reaction, the addition of bicarbonate can stabilize Mn(III) in manganese dioxide, thereby improving the catalytic activity of manganese dioxide. By adding the activator sodium bicarbonate to activate the amorphous manganese dioxide catalyst, the performance of chlorine dioxide in oxidative degradation of polycyclic aromatic hydrocarbons in contaminated soil can be effectively improved.

[0026] (2) The chlorine dioxide used in the present invention is a green and efficient strong oxidant. Manganese dioxide and sodium bicarbonate have large natural reserves, are cheap and easy to obtain, and are green and environmentally friendly. No toxic by-products are produced during the remediation process, which can effectively reduce secondary pollution to the soil. Combined with the oxidative characteristics of chlorine dioxide's single electron transfer, this method does not produce toxic by-products and has a simple operation process.

[0027] (3) The present invention uses sodium bicarbonate as an activator, in which bicarbonate ions play an activating role, and sodium bicarbonate itself can condition acidic soil. When sodium bicarbonate is applied to saline-alkali land, baking soda can combine sodium ions with calcium ions in the soil, reduce the accumulation of salt in the soil, and improve the soil structure. At the same time, sodium bicarbonate itself is cheap and easy to obtain, and the production cost is low. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the scope of protection of the present invention is not limited to the following embodiments. Based on the given embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] Unless otherwise specified, the reagents, methods, instruments and equipment used in the present invention are conventional in the art. If no special processing techniques are specified, they are all conventional processing techniques in the art.

[0030] Example 1

[0031] The method of activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide to oxidatively degrade pollutants in soil in this embodiment specifically includes the following steps:

[0032] 1. Weigh 0.5 g of crushed and sieved PAH-contaminated soil (particle size 0.25 mm, PAH content 2092 mg / kg, including 16 PAHs such as anthracene, naphthalene, and phenanthrene) into a 40 mL light-proof brown glass bottle.

[0033] 2. Add catalyst amorphous manganese dioxide, activator sodium bicarbonate and oxidant chlorine dioxide solution into a glass bottle, where the mass of catalyst amorphous manganese dioxide is 0.0020g, the mass of activator sodium bicarbonate is 0.0010g, and the concentration of chlorine dioxide solution in the final reaction system is 2000mg / L (the ratio of the mass of oxidant chlorine dioxide solution, catalyst amorphous manganese dioxide, activator sodium bicarbonate to the mass of polycyclic aromatic hydrocarbons in contaminated soil is 20:2:1:1). Adjust the pH of the reaction system to 6. The total solution in the system is 10mL.

[0034] 3. Place the reaction system in an oscillator, protect from light, at 180 rpm, 25°C, and react for 12 hours.

[0035] 4. After the reaction is complete, centrifuge at 3500 rpm for 20 minutes and discard the supernatant. The resulting soil is the remediated soil.

[0036] The total content of PAHs in the contaminated soil before and after treatment was measured to be 2092 mg / kg and 304.2 mg / kg, respectively. The oxidative degradation system can repair 85.46% of PAHs in the contaminated soil, as shown in Table 1. The content of benzo[a]pyrene in the contaminated soil before and after treatment was 159.8 mg / kg and 9.84 mg / kg, respectively. The oxidative degradation system can repair 93.85% of benzo[a]pyrene in the contaminated soil, as shown in Table 2.

[0037] Example 2

[0038] The method of activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide to oxidatively degrade pollutants in soil in this embodiment specifically includes the following steps:

[0039] 1. Weigh 0.5 g of crushed and sieved PAH-contaminated soil (particle size 0.25 mm, PAH content 2092 mg / kg, including 16 PAHs such as anthracene, naphthalene, and phenanthrene) into a 40 mL light-proof brown glass bottle.

[0040] 2. Add catalyst amorphous manganese dioxide, activator sodium bicarbonate and oxidant chlorine dioxide solution into a glass bottle, where the mass of catalyst amorphous manganese dioxide is 0.0020g, the mass of activator sodium bicarbonate is 0.0020g, and the concentration of chlorine dioxide solution in the final reaction system is 2000mg / L (the ratio of the mass of oxidant chlorine dioxide solution, catalyst amorphous manganese dioxide, activator sodium bicarbonate to the mass of polycyclic aromatic hydrocarbons in contaminated soil is 20:2:2:1). Adjust the pH of the reaction system to 6. The total solution in the system is 10mL.

[0041] 3. Place the reaction system in an oscillator, protect from light, at 180 rpm, 25°C, and react for 12 hours.

[0042] 4. After the reaction is complete, centrifuge at 3500 rpm for 20 minutes and discard the supernatant. The resulting soil is the remediated soil.

[0043] The total content of PAHs in the contaminated soil before and after treatment was measured to be 2092 mg / kg and 295.8 mg / kg, respectively. The oxidative degradation system can repair 85.86% of PAHs in the contaminated soil. See Table 1 for details. The content of benzo[a]pyrene in the contaminated soil before and after treatment was 159.8 mg / kg and 9.39 mg / kg, respectively. The oxidative degradation system can repair 94.13% of benzo[a]pyrene in the contaminated soil. See Table 2 for details.

[0044] Example 3

[0045] The method of activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide to oxidatively degrade pollutants in soil in this embodiment specifically includes the following steps:

[0046] 1. Weigh 0.5 g of crushed and sieved PAH-contaminated soil (particle size 0.25 mm, PAH content 2092 mg / kg, including 16 PAHs such as anthracene, naphthalene, and phenanthrene) into a 40 mL light-proof brown glass bottle.

[0047] 2. Add catalyst amorphous manganese dioxide, activator sodium bicarbonate and oxidant chlorine dioxide solution into a glass bottle, where the mass of catalyst amorphous manganese dioxide is 0.0020g, the mass of activator sodium bicarbonate is 0.0030g, and the concentration of chlorine dioxide solution in the final reaction system is 2000mg / L (the ratio of the mass of oxidant chlorine dioxide solution, catalyst amorphous manganese dioxide, activator sodium bicarbonate to the mass of polycyclic aromatic hydrocarbons in contaminated soil is 20:2:3:1). Adjust the pH of the reaction system to 6. The total solution in the system is 10mL.

[0048] 3. Place the reaction system in an oscillator, protect from light, at 180 rpm, 25°C, and react for 12 hours.

[0049] 4. After the reaction is complete, centrifuge at 3500 rpm for 20 minutes and discard the supernatant. The resulting soil is the remediated soil.

[0050] The total content of PAHs in the contaminated soil before and after treatment was measured to be 2092 mg / kg and 231.2 mg / kg, respectively. The oxidative degradation system can repair 88.95% of PAHs in the contaminated soil. See Table 1 for details. The content of benzo[a]pyrene in the contaminated soil before and after treatment was 159.8 mg / kg and 2.86 mg / kg, respectively. It can repair 98.22% of benzo[a]pyrene in the contaminated soil. See Table 2 for details.

[0051] Comparative Example 1

[0052] The method of activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide to oxidatively degrade pollutants in soil in this embodiment specifically includes the following steps:

[0053] 1. Weigh 0.5 g of crushed and sieved PAH-contaminated soil (particle size 0.25 mm, PAH content 2092 mg / kg, including 16 PAHs such as anthracene, naphthalene, and phenanthrene) into a 40 mL light-proof brown glass bottle.

[0054] 2. Add catalyst amorphous manganese dioxide, activator sodium bicarbonate and oxidant chlorine dioxide solution into a glass bottle, where the mass of catalyst amorphous manganese dioxide is 0.0020 g, the mass of activator sodium bicarbonate is 0.0010 g, and the concentration of chlorine dioxide solution in the final reaction system is 2000 mg / L (the ratio of the mass of oxidizing agent chlorine dioxide solution, catalyst amorphous manganese dioxide, activator sodium bicarbonate to the mass of polycyclic aromatic hydrocarbons in contaminated soil is 20:2:1:1). Adjust the pH of the reaction system to 3 to explore the effect of pH on the reaction system. A total of 10 mL of solution is contained in the system.

[0055] 3. Place the reaction system in an oscillator, protect from light, at 180 rpm, 25°C, and react for 12 hours.

[0056] 4. After the reaction is complete, centrifuge at 3500 rpm for 20 minutes and discard the supernatant. The resulting soil is the remediated soil.

[0057] The total content of PAHs in the contaminated soil before and after treatment was measured to be 2092 mg / kg and 409.8 mg / kg, respectively. The oxidative degradation system can repair 80.41% of PAHs in the contaminated soil, as shown in Table 1. The content of benzo[a]pyrene in the contaminated soil before and after treatment was 159.8 mg / kg and 15.9 mg / kg, respectively. The oxidative degradation system can repair 90.06% of benzo[a]pyrene in the contaminated soil, as shown in Table 2.

[0058] Comparative Example 2

[0059] The method of activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide to oxidatively degrade pollutants in soil in this embodiment specifically includes the following steps:

[0060] 1. Weigh 0.5 g of crushed and sieved PAH-contaminated soil (particle size 0.25 mm, PAH content 2092 mg / kg, including 16 PAHs such as anthracene, naphthalene, and phenanthrene) into a 40 mL light-proof brown glass bottle.

[0061] 2. Add 0.0020 g of amorphous manganese dioxide (0.0020 g) and chlorine dioxide solution (0.002 g) to a glass bottle. The final concentration of chlorine dioxide solution in the reaction system is 2000 mg / L (the ratio of the mass of chlorine dioxide solution (0.002 g) to the mass of polycyclic aromatic hydrocarbons in the contaminated soil is 20:2:1). Adjust the pH of the reaction system to 6. The total volume of the solution in the system is 10 mL.

[0062] 3. Place the reaction system in an oscillator, protect from light, at 180 rpm, 25°C, and react for 12 hours.

[0063] 4. After the reaction is complete, centrifuge at 3500 rpm for 20 minutes and discard the supernatant. The resulting soil is the remediated soil.

[0064] The total content of PAHs in the contaminated soil before and after treatment was measured to be 2092 mg / kg and 396.8 mg / kg, respectively. The oxidative degradation system can repair 81.03% of PAHs in the contaminated soil. See Table 1 for details. The content of benzo[a]pyrene in the contaminated soil before and after treatment was 159.8 mg / kg and 14.3 mg / kg, respectively. The oxidative degradation system can repair 91.06% of benzo[a]pyrene in the contaminated soil. See Table 2 for details.

[0065] Comparative Example 3

[0066] The method of activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide to oxidatively degrade pollutants in soil in this embodiment specifically includes the following steps:

[0067] 1. Weigh 0.5 g of crushed and sieved PAH-contaminated soil (particle size 0.25 mm, PAH content 2092 mg / kg, including 16 PAHs such as anthracene, naphthalene, and phenanthrene) into a 40 mL light-proof brown glass bottle.

[0068] 2. Add 0.0020 g of amorphous manganese dioxide into a glass bottle (the ratio of the mass of catalytic amorphous manganese dioxide to the mass of polycyclic aromatic hydrocarbons in the contaminated soil is 20:1), adjust the pH of the reaction system to 6, and the total solution in the system is 10 mL.

[0069] 3. Place the reaction system in an oscillator, protect from light, at 180 rpm, 25°C, and react for 12 hours.

[0070] 4. After the reaction is complete, centrifuge at 3500 rpm for 20 minutes and discard the supernatant. The resulting soil is the remediated soil.

[0071] The total content of PAHs in the contaminated soil before and after treatment was measured to be 2092 mg / kg and 1177.2 mg / kg, respectively. The oxidative degradation system can repair 43.73% of PAHs in the contaminated soil, as shown in Table 1. The content of benzo[a]pyrene in the contaminated soil before and after treatment was 159.8 mg / kg and 93.3 mg / kg, respectively. The system can repair 41.6% of benzo[a]pyrene in the contaminated soil, as shown in Table 2.

[0072] Comparative Example 4

[0073] The method of activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide to oxidatively degrade pollutants in soil in this embodiment specifically includes the following steps:

[0074] 1. Weigh 0.5 g of crushed and sieved PAH-contaminated soil (particle size 0.25 mm, PAH content 2092 mg / kg, including 16 PAHs such as anthracene, naphthalene, and phenanthrene) into a 40 mL light-proof brown glass bottle.

[0075] 2. Add chlorine dioxide, an oxidant, to a glass bottle at a concentration of 2000 mg / L (the mass ratio of chlorine dioxide to polycyclic aromatic hydrocarbons in the contaminated soil is 20:1). Adjust the pH of the reaction system to 6. The total volume of the solution in the system is 10 mL.

[0076] 3. Place the reaction system in an oscillator, protect from light, at 180 rpm, 25°C, and react for 12 hours.

[0077] 4. After the reaction is complete, centrifuge at 3500 rpm for 20 minutes and discard the supernatant. The resulting soil is the remediated soil.

[0078] The total content of PAHs in the contaminated soil before and after treatment was measured to be 2092 mg / kg and 710.4 mg / kg, respectively. The oxidative degradation system can repair 66.04% of PAHs in the contaminated soil, as shown in Table 1. The content of benzo[a]pyrene in the contaminated soil before and after treatment was 159.8 mg / kg and 78.67 mg / kg, respectively. The oxidative degradation system can repair 50.78% of benzo[a]pyrene in the contaminated soil, as shown in Table 2.

[0079] Table 1 shows the polycyclic aromatic hydrocarbon content and the remediation effect of the contaminated soil before and after treatment in Examples 1 to 3 and Comparative Examples 1 to 4. Table 2 shows the benzo[a]pyrene content and the remediation effect of the contaminated soil before and after treatment in Examples 1 to 3 and Comparative Examples 1 to 4.

[0080] Table 1 PAH content and remediation effect of contaminated soil before and after treatment in Examples 1-3 and Comparative Examples 1-4

[0081]

[0082] Table 2 Benzo[a]pyrene content and remediation effects of contaminated soils before and after treatment in Examples 1-3 and Comparative Examples 1-4

[0083]

[0084] By comparing the comparative examples with the embodiments, it can be seen that by adding sodium bicarbonate to activate the amorphous manganese dioxide catalyst, it can effectively catalyze chlorine dioxide to oxidatively degrade polycyclic aromatic hydrocarbons in contaminated soil. Only a small amount of sodium bicarbonate is needed to effectively improve the catalytic activity of manganese dioxide, thereby improving the performance of chlorine dioxide in oxidatively degrading polycyclic aromatic hydrocarbons in contaminated soil; and the degradation effect on polycyclic aromatic hydrocarbons such as benzo[a]pyrene is more prominent. As persistent organic pollutants in soil, polycyclic aromatic hydrocarbons have carcinogenic, teratogenic, and mutagenic effects, are highly harmful to the environment, and are difficult to degrade. The manganese dioxide, chlorine dioxide, and sodium bicarbonate selected in the present invention are all environmentally friendly agents that will not cause secondary pollution to the soil. Moreover, manganese dioxide and sodium bicarbonate themselves exist in large quantities in the environment, are cheap and readily available, and are relatively environmentally friendly.

[0085] Although the present invention has been described in detail above using general explanations, specific embodiments, and experiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A method for oxidatively degrading pollutants in soil by activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide, characterized in that: The oxidizing agent chlorine dioxide solution, the catalytic agent amorphous manganese dioxide and the activating agent sodium bicarbonate are mixed with the contaminated soil for degradation and remediation treatment; The contaminated soil is soil contaminated by polycyclic aromatic hydrocarbons; The ratio of the sum of the mass of the oxidizing agent chlorine dioxide solution and the catalytic agent amorphous manganese dioxide, the mass of the activating agent sodium bicarbonate and the mass of the polycyclic aromatic hydrocarbons in the contaminated soil is (2-22): (1-3): 1; The mass ratio of the oxidizing agent chlorine dioxide solution to the catalytic agent amorphous manganese dioxide is (5-15):

1.

2. The method for oxidative degradation of pollutants in soil by activating amorphous manganese dioxide with sodium bicarbonate according to claim 1, wherein: The contaminated soil was first sampled, and the total amount of polycyclic aromatic hydrocarbons pollutants contained therein was detected to be 2092 mg / kg.

3. The method for oxidative degradation of pollutants in soil by activating amorphous manganese dioxide with sodium bicarbonate to catalyze chlorine dioxide according to claim 2, characterized in that: The polycyclic aromatic hydrocarbons in the contaminated soil are extracted and then tested using an extraction solvent, wherein the extraction solvent is n-hexane and / or dichloromethane.

4. The method for oxidative degradation of pollutants in soil by catalyzing chlorine dioxide using sodium bicarbonate activated amorphous manganese dioxide according to claim 3, characterized in that: The contaminated soil is crushed and screened before extraction.

5. The method for oxidative degradation of pollutants in soil by catalyzing chlorine dioxide using sodium bicarbonate activated amorphous manganese dioxide according to claim 1, characterized in that: The polycyclic aromatic hydrocarbons are one or more of naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, indeno[1,2,3-cd]pyrene, dibenzo[a,h]anthracene or benzo[g,h,i]perylene.

6. The method for oxidative degradation of pollutants in soil by catalyzing chlorine dioxide using sodium bicarbonate activated amorphous manganese dioxide according to claim 1, characterized in that: During the degradation and remediation process of contaminated soil, the concentration of chlorine dioxide is 1000~3000 mg / L, the mass of amorphous manganese dioxide is 0.0016~0.0040g, and the mass of sodium bicarbonate is 0.0010~0.0030g.

7. The method for oxidative degradation of pollutants in soil by catalyzing chlorine dioxide using sodium bicarbonate activated amorphous manganese dioxide according to claim 1, characterized in that: The mixing method of the oxidizing agent chlorine dioxide solution, the catalytic agent amorphous manganese dioxide and the activating agent sodium bicarbonate with the contaminated soil is one or a combination of spraying, drip irrigation, stirring mixing and shaking mixing.

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