Method for synergistically degrading soil organic pollutants by active oxygen free radicals and organic materials

Abstract

The invention relates to a method for synergistically degrading organic pollutants in soil by active oxygen free radicals and organic materials, which comprises the following steps: ploughing soil in a target area to obtain pretreated soil; adding a mixture of an organic material and modified bentonite into the pretreated soil, and uniformly stirring to obtain mixed soil A; the mixed soil A is subjected to alternate wetting and drying treatment, and activated soil B is obtained; and adding a compound microbial agent into the activated soil B, and performing degradation treatment to complete synergistic degradation of active oxygen free radicals and organic materials of organic pollutants in the soil. By combining the synergistic effect of the organic material and the modified bentonite, the production efficiency of active oxygen free radicals and the pollutant degradation rate are remarkably improved, the degradation rate reaches up to 90% or above, a staged degradation strategy is adopted, resource utilization is optimized, and the remediation cost is reduced; the used materials are all agricultural wastes and natural minerals, the green restoration concept is met, and secondary pollution is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of soil organic pollutant treatment, and in particular to a method for degrading soil organic pollutants by active oxygen free radicals and organic materials in cooperation. BACKGROUND

[0002] At present, the treatment of soil organic pollutants is a research hotspot and difficulty in the environmental field. In the prior art, commonly used technical means include physical remediation, chemical remediation and biological remediation. For example: CN114570759A, a soil remediation control method and system of thermal-assisted in-situ chemical oxidation; CN114181866A, anisomeride degrading bacillus GDUTAN16 and its application; CN114570433A, a composite photocatalyst for wastewater sterilization and its preparation method and application.

[0003] However, the existing technology in the field of soil organic pollutant remediation has the following disadvantages: the method relying on external chemical reagents has high degradation efficiency, but the cost is high, may introduce secondary pollution, and can damage the soil structure; the method relying on microbial metabolism is environmentally friendly, but the degradation speed is slow, the environmental conditions are strongly dependent, and it is mainly aimed at specific pollutants, and the application range is limited. These technologies have limitations in cost, efficiency, environmental impact and applicability in practical application, indicating that there is still room for improvement in the existing technology. SUMMARY

[0004] The purpose of the present application is to overcome the above technical deficiencies, provide a method for degrading soil organic pollutants by active oxygen free radicals and organic materials in cooperation, and solve the technical problem that the treatment of soil organic pollutants in the prior art cannot simultaneously consider high cost and degradation efficiency.

[0005] To achieve the above technical purpose, the technical solution provided by the present application is: In a first aspect, the present application provides a method for degrading soil organic pollutants by active oxygen free radicals and organic materials in cooperation, comprising the following steps: S1, plowing the soil in the target area to obtain pretreated soil; S2, adding a mixture of organic materials and modified bentonite to the pretreated soil and mixing evenly to obtain mixed soil A; S3, the mixed soil A is subjected to dry-wet alternating treatment to obtain activated soil B; S4, adding a compound microbial inoculant to the activated soil B, and degrading to complete the degradation of soil organic pollutants by active oxygen free radicals and organic materials in cooperation.

[0006] Compared with the prior art, the present application has the following advantages: The application significantly improves the generation efficiency of active oxygen free radicals and the degradation rate of pollutants by 90% or more, which is much higher than that of the traditional chemical oxidation method; adopts a phased degradation strategy to optimize resource utilization, and the treatment cost is only about 1 / 3 of that of the traditional method; the materials used are agricultural waste and natural minerals, which meet the green repair concept and avoid secondary pollution; it is widely applicable to various contaminated soils and complex pollutants, such as polycyclic aromatic hydrocarbons and pesticide residues; and it can significantly improve soil enzyme activity and microbial quantity and improve the health status of the soil ecosystem. Therefore, the method of the application has significant advantages in cost, efficiency, environmental friendliness, applicability and soil ecosystem repair, and has broad application prospects. DETAILED DESCRIPTION

[0007] In order to make the purpose, technical scheme and advantages of the application clearer, the application will be further described in detail below with examples. It should be understood that the specific examples described herein are only used to explain the application and not to limit the application.

[0008] Traditional soil organic pollutant remediation technologies have many limitations, such as high cost and possible secondary pollution of chemical oxidation method, and slow speed and strong dependence on environmental conditions of biological degradation method. The application provides a method for degrading soil organic pollutants by active oxygen free radicals and organic materials in cooperation, which induces the oxidation of iron ions in the soil to produce active oxygen free radicals (ROS) through dry-wet alternating treatment, and ROS and organic pollutants undergo oxidation reaction to destroy their chemical structure and achieve degradation. Organic materials (such as manure and straw) and modified bentonite cooperate with each other, the former provides nutrition to promote microbial growth and ROS production, and the latter adsorbs pollutants to enhance ROS production and adsorption capacity. The phased treatment strategy first uses high-concentration ROS to rapidly degrade high-concentration pollutants, and then uses modified bentonite and microbial inoculants to treat residual pollutants, thereby reducing the cost. At the same time, the organic material increases the soil organic matter, the modified bentonite enhances the adsorption and buffering performance, and the microbial inoculants promote the recovery of microbial community, which together improve the soil ecosystem and avoid secondary pollution.

[0009] In a first aspect, the application provides a method for degrading soil organic pollutants by active oxygen free radicals and organic materials, comprising the following steps: S1, plowing the soil in the target area to obtain pretreated soil; S2, adding a mixture of organic materials and modified bentonite to the pretreated soil and mixing evenly to obtain mixed soil A; S3, dry-wet alternating treatment of mixed soil A to obtain activated soil B; S4, adding a compound microbial agent to the activated soil B, and performing degradation treatment to complete the degradation of the organic pollutants in the soil by the active oxygen free radicals and the organic materials.

[0010] Preferably, in step S1, the ploughing depth of the ploughing treatment is 20-30 cm.

[0011] Preferably, in step S2, when the mixture of the organic materials and the modified bentonite is added to the pretreated soil, the water content of the pretreated soil is 50-80%, and the environmental temperature is 20-30°C.

[0012] Preferably, in step S2, the organic materials include a mixture of animal manure and straw.

[0013] Further preferably, the animal manure includes one or both of chicken manure and pig manure; and the straw includes one or more of rice straw, wheat straw, and corn straw.

[0014] Preferably, in step S2, the particle size of the organic materials is ≤5 mm.

[0015] Preferably, in step S2, the modified bentonite is porous sodium-based bentonite with a specific surface area >80 m 2 / g and a pore size of 3-5 nm.

[0016] Preferably, in step S2, the amount of the organic materials added is 2-3% of the mass of the pretreated soil; and the mass ratio of the organic materials to the modified bentonite is (10-20):1.

[0017] Preferably, in step S3, the dry-wet alternating treatment specifically includes: adjusting the water content of the mixed soil A to 60-70% and keeping for 24-48 h, then adjusting the water content to 30-40% and keeping for 12-24 h, and finally keeping still for 2-12 h to complete one dry-wet alternating treatment; and repeating the dry-wet alternating treatment for 3-5 times.

[0018] Preferably, in step S4, the amount of the compound microbial agent added is 10 7 to 10 8 CFU per kilogram of soil. Here, the soil per kilogram of soil is the activated soil B.

[0019] Preferably, in step S4, the compound microbial agent includes a mixture of Pseudomonas and Bacillus.

[0020] Preferably, in step S4, the degradation treatment is performed in an aerobic environment, and the water content of the soil is 50-60%, the temperature is 25-30°C, and the time is 48-72 h. It can be understood that the aerobic environment can be a natural environment, and in a laboratory, the aeration amount of 0.1-0.2 L per gram of soil per minute can be used to ensure the aerobic condition.

[0021] The main mechanism and advantages of the present application are: (1) The present application first plows the target area soil to ensure that the soil particles are loose and uniform. Then, the soil moisture content is adjusted using a humidity adjusting device, and the appropriate environmental temperature is controlled to provide stable initial conditions for subsequent processing. Then, the mixture of organic matter and modified bentonite is added to the pretreated soil, which is uniformly distributed in the soil by plowing or stirring; the dry-wet alternating treatment is carried out for 3-5 times, with a single duration of about 2-3 days; a large amount of active oxygen free radicals are generated within 2-12 hours of standing time after the dry-wet alternating treatment, for the first stage of degradation treatment, and no additional operation is required during this period to maintain the natural state, taking advantage of the high concentration of active oxygen free radicals at this time to preliminarily degrade high-concentration organic pollutants in the soil, with a duration of no more than 12 hours; immediately after the dry-wet alternating treatment, the composite microbial inoculant is added for the second stage of degradation treatment to complete the degradation of organic pollutants in the soil.

[0022] (2) Synergistic mechanism: The present application significantly improves the efficiency of active oxygen free radicals and the degradation rate of pollutants through the synergistic effect of organic matter (such as manure, straw) and modified bentonite. This synergistic mechanism not only rapidly degrades organic pollutants, but also enhances the adsorption capacity and buffering performance of the soil, which is not available in the prior art.

[0023] (3) Staged degradation strategy: The present application adopts a staged degradation treatment strategy, which first utilizes high-concentration active oxygen free radicals to rapidly degrade high-concentration pollutants, and then uses modified bentonite and microbial inoculants to treat residual pollutants. This strategy optimizes resource utilization, reduces remediation costs, and improves treatment efficiency, avoiding the problems of resource waste and incomplete treatment in traditional methods.

[0024] (4) Environmental friendliness: The materials used in the present application are all agricultural waste (such as manure, straw) and natural minerals (such as bentonite), which meet the green remediation concept and avoid the secondary pollution caused by the addition of chemical reagents in traditional chemical oxidation methods, making it more friendly to the soil ecosystem.

[0025] (5) Efficiency and applicability: The present application has high degradation efficiency for various contaminated soils and complex pollutants (such as polycyclic aromatic hydrocarbons, pesticide residues, etc.), with a wide range of applications. Experimental data show that the degradation rate of the present application is significantly higher than that of traditional methods, and the treatment cost is lower, with higher economic efficiency and practicality.

[0026] (6) Soil ecosystem restoration: The method of the present application not only effectively degrades organic pollutants in the soil, but also significantly improves the physical, chemical and biological properties of the soil, increases the soil enzyme activity and the number of microorganisms, and promotes the restoration and health of the soil ecosystem, which is difficult to achieve by traditional methods.

[0027] In summary, the present application has significant advantages in synergistic mechanism, phased degradation strategy, environmental friendliness, high efficiency and applicability, and soil ecosystem restoration, and has important application value and promotion prospects.

[0028] The present application will be further described in detail below through specific examples. Each example and comparative example is provided with three parallel samples.

[0029] Example 1 (degradation of polycyclic aromatic hydrocarbons and pesticide residues in farmland soil) A method for degrading soil organic pollutants by active oxygen free radicals in cooperation with organic materials, comprising the following steps: S1, plowing the target area soil to a depth of 25 cm, then adjusting the soil moisture content to 60%, and controlling the temperature at 25℃ to obtain pretreated soil; wherein the target area soil is farmland soil contaminated by polycyclic aromatic hydrocarbons (phenanthrene, pyrene) and pesticide residues (imidacloprid), the pollutants are: phenanthrene 320 mg kg -1 , pyrene 280 mg kg -1 , imidacloprid 45 mg kg -1 , and the basic properties of the soil are: pH value 6.7, organic matter content 2.8%, and soil particle composition mainly sandy loam; S2, adding a mixture of organic materials and porous sodium-based bentonite to the pretreated soil and mixing evenly to obtain mixed soil A; wherein the organic materials include 2% chicken manure and 0.8% rice straw by mass of the pretreated soil, and the mass ratio of the organic materials to the porous sodium-based bentonite is 15:1; S3, the mixed soil A is subjected to dry-wet alternating treatment, specifically: adjusting the soil moisture content to 65% and maintaining for 36 h, then reducing to 35% and maintaining for 18 h, repeating the cycle for 4 times, and standing for 8 h (without additional artificial operation) after each cycle to obtain activated soil B; wherein a large amount of active oxygen free radicals is generated during the standing, and the pollutants are mainly degraded by the active oxygen free radicals in this stage; S4, adding a composite microbial agent (Pseudomonas putida HP-1 (2×10 7 CFU) 40%, Bacillus subtilis NX-2 (2×10 7CFU) 40%, Bacillus cereus PH-7 (1 x 10 7 CFU) 20%, and the total amount of addition was 5 x 10 7 CFU; the degradation treatment was carried out under the conditions of 25°C and 60% water content for 72 hours, and the soil was ventilated during the period, and the ventilation amount was 0.1-0.2 L per gram of soil per minute, so as to realize the synergistic degradation of active oxygen free radicals and organic materials on the soil organic pollutants.

[0030] Comparative Example 1 The farmland soil (the sample source was the same as that in Example 1) polluted by polycyclic aromatic hydrocarbons and pesticide residues was treated by using a traditional chemical oxidation method. Firstly, the soil was ploughed to a depth of 25 cm, and the water content of the soil was adjusted to 60%, and the temperature was controlled at 25°C. Then, sodium persulfate was added to the pretreated soil, and the amount of addition was 0.5% of the mass of the soil. The persulfate was dissolved in an appropriate amount of water, uniformly sprayed on the surface of the soil, and gently stirred with a tool to make the persulfate fully mixed with the soil. Then, the treated soil was placed in an incubator under the conditions of 25°C and 60% water content for 72 hours, and the soil was ventilated during the period, and the ventilation amount was 0.1-0.2 L per gram of soil per minute. After standing, the water content and ventilation amount of the soil were continuously maintained under the same conditions until the end of the experiment (the total time was the same as that in Example 1).

[0031] The soil before and after the degradation in Example 1 and Comparative Example 1 was tested, the degradation rate of pollutants (accelerated solvent extraction-gas chromatography-mass spectrometry), the soil enzyme activity (urease: indophenol blue colorimetry; phosphatase: p-nitrophenyl phosphate disodium colorimetry; catalase: potassium permanganate titration), and the number of soil microorganisms (plate colony counting method (CFU method)-dilution plate coating method) were obtained, and the cost was analyzed, and the results are shown in Table 1.

[0032] Table 1: Degradation effect and cost comparison of Example 1 and Comparative Example 1

[0033] As can be seen from the results in Table 1, compared with the treatment method of Comparative Example 1, the treatment method of Example 1 can significantly improve the generation efficiency of active oxygen free radicals through the synergistic effect of organic materials and modified bentonite, so as to rapidly degrade the organic pollutants in the soil, and the degradation rate of pollutants is more than 93%. At the same time, the phased treatment strategy optimizes the resource utilization, reduces the remediation cost, and enhances the soil enzyme activity and the number of microorganisms, which indicates that the method has a positive effect on the remediation of the soil ecosystem.

[0034] Example 2 (degradation of pesticide residues in orchard soil) A method for degrading soil organic pollutants by active oxygen radicals in cooperation with organic materials, comprising the following steps: S1, plowing the soil in the target area to a depth of 20 cm, then adjusting the soil moisture content to 55%, and controlling the temperature at 28°C to obtain pretreated soil; wherein the soil in the target area is the soil in a certain orchard contaminated by pesticide residues (chlorpyrifos, acetamiprid), and the basic properties of the soil are as follows: pH value 6.0-6.5, organic matter content 3%-4%, and soil particle composition mainly clay soil; S2, adding a mixture of organic materials and porous sodium-based bentonite to the pretreated soil and mixing evenly to obtain mixed soil A; wherein the organic materials include 1.5% pig manure and 0.6% wheat straw by mass of the pretreated soil, and the mass ratio of the organic materials to the porous sodium-based bentonite is 18:1; S3, the mixed soil A is subjected to dry-wet alternating treatment, specifically: adjusting the soil moisture content to 60% and maintaining for 48 h, then reducing to 35% and maintaining for 24 h, repeating the cycle for 3 times, and standing for 10 h after each cycle to obtain activated soil B; wherein a large amount of active oxygen radicals is generated during the standing, and the pollutants are mainly degraded by the active oxygen radicals in this stage; S4, adding a composite microbial agent to the activated soil B, the composite microbial agent comprising Pseudomonas putida HP-1 (2×10 7 CFU) 40%, Bacillus subtilis NX-2 (2×10 7 CFU) 40%, and Bacillus cereus PH-7 (1×10 7 CFU) 20%, and the addition amount is 5×10 7 CFU per kilogram of soil; and standing for 72 hours at 28°C and 55% moisture content for degradation treatment, during which the soil is kept aerated at an aeration amount of 0.1-0.2 L per gram of soil per minute, to complete the degradation of the soil organic pollutants by active oxygen radicals in cooperation with organic materials.

[0035] Comparative Example 2 The soil in the orchard (sample source same as Example 2) was treated by a composite microbial agent using a traditional biodegradation method. First, the soil was plowed to a depth of 20 cm, and the soil moisture content was adjusted to 55%, and the temperature was controlled at 28°C. Then, the composite microbial agent was added to the soil, and the addition amount was 5×10 7CFU. The inoculant was dissolved in an appropriate amount of water, evenly sprayed on the surface of the soil, and gently mixed with tools to fully mix the inoculant with the soil. Then the treated soil was placed in an incubator at 28℃ and 55% moisture content for 48 hours, during which the soil was kept aerated at a rate of 0.1-0.2L per gram of soil per minute. After standing, the soil moisture content and aeration were maintained under the same conditions until the end of the experiment (10 days).

[0036] The soil before and after degradation of Example 2 and Comparative Example 2 was tested to obtain the pollutant degradation rate, soil enzyme activity, and soil microbial quantity, and the cost was analyzed, and the results are shown in Table 2 below.

[0037] Table 2 Comparison of degradation effect and cost of Example 2 and Comparative Example 2

[0038] As can be seen from the results in Table 2, the present application significantly improves the efficiency of active oxygen free radicals through the synergistic effect of organic materials and modified bentonite, thereby rapidly degrading pesticide residues in the soil. Compared with the traditional biological degradation method, the present application not only improves the degradation efficiency, but also reduces the treatment cost, and improves the soil enzyme activity and microbial quantity, indicating that the present application has a significant advantage in the repair of orchard soil.

[0039] Example 3 Compared with Example 1, the only difference is that the target area soil in step S1 is a farmland soil contaminated by polycyclic aromatic hydrocarbons (acenaphthene, fluorene) in a certain place, and the soil basic properties are as follows: pH value 6.8-7.2, organic matter content 2.5%-3.5%, soil particle composition mainly clay, and the degradation time in step S4 is 60h; other steps and conditions are the same as those in Example 1 (the organic material in step S2 of Example 1 is 2% chicken manure and 0.8% rice straw based on the mass of the pretreated soil).

[0040] Example 4 Compared with Example 3, the only difference is that the organic material in step S2 is 1.5% pig manure and 0.6% wheat straw based on the mass of the pretreated soil; other steps and conditions are the same as those in Example 3.

[0041] Example 5 Compared with Example 3, the only difference is that the organic material in step S2 is 1.5% chicken manure and 0.8% wheat straw based on the mass of the pretreated soil; other steps and conditions are the same as those in Example 3.

[0042] The soil before and after degradation of Examples 3-5 was tested to obtain the pollutant degradation rate, soil enzyme activity, and soil microbial quantity, and the cost was analyzed, and the results are shown in Table 3 below.

[0043] Table 3 Degradation effect and cost comparison of Examples 3-5

[0044] From the results in Table 3, it can be seen that different combinations of organic materials have certain effects on the degradation effect. Example 3 (chicken manure + rice straw) performs best in degrading polycyclic aromatic hydrocarbons, possibly because the nutrient composition of chicken manure and rice straw is more conducive to the generation of active oxygen free radicals and the growth of microorganisms. Example 4 (pig manure + wheat straw) has the lowest cost, but the degradation efficiency is slightly lower than that of Example 3. Example 5 (chicken manure + wheat straw) achieves a good balance between degradation efficiency and cost. This shows that by optimizing the combination of organic materials, the degradation efficiency and economy of the method of the present application can be further improved.

[0045] Comparative Example 3 Compared with Example 1, the only difference is that the dry-wet alternating condition in step S3 is adjusted to be treated at too high humidity, specifically: adjusting the soil moisture content to 80% and keeping for 36h, then reducing to 40% and keeping for 12h, repeating for 4 cycles, other steps and conditions are the same as Example 1.

[0046] Comparative Example 4 Compared with Example 1, the only difference is that the dry-wet alternating condition in step S3 is adjusted to be treated at too low humidity, specifically: adjusting the soil moisture content to 65% and keeping for 36h, then reducing to 20% and keeping for 30h, repeating for 4 cycles, other steps and conditions are the same as Example 1.

[0047] Comparative Example 5 Compared with Example 1, the only difference is that the dry-wet alternating cycle number in step S3 is 2 times; other steps and conditions are the same as Example 1.

[0048] The soil before and after degradation of Comparative Examples 3-5 was tested to obtain the pollutant degradation rate, ·OH relative yield (where the ·OH yield of Example 1 is obtained by rapid sampling after the end of dry-wet alternating treatment, and the hydroxyl radical (·OH) is determined by the terephthalic acid fluorescence probe method), soil enzyme activity, and the results are shown in Table 4 below.

[0049] Table 4 Test results of Comparative Examples 3-5 (average value, n=3)

[0050] From the results in Table 4, when the dry-wet alternating parameters are too high or too low (humidity > 70% or < 30%, cycle number < 3), the active oxygen free radical yield decreases by 18-29%, the pollutant degradation rate decreases by about 8-12%, and the soil enzyme activity also decreases significantly, mainly due to the too high humidity in Comparative Example 3, the soil is locally anaerobic, Fe2+ Oxidation is inhibited; in Comparative Example 4, over-drying destroys microbial activity, and the ROS production pulse is short; and in Comparative Example 5, the cycle is insufficient, and the total Fe 2+ The number of oxidation times is small, and the cumulative ROS amount is low; therefore, in the present application, in the wet-dry alternating treatment, it is preferable to use 60-70 % / 30-40 % alternation, 3-5 cycles.

[0051] Comparative Example 6 Compared with Example 1, the only difference is that the composite microbial agent is adjusted to be added synchronously with the organic material and modified bentonite in step S2; the other steps and conditions are the same as in Example 1.

[0052] The detection results of Example 1 and Comparative Example 6 are statistically analyzed, and the results are shown in Table 5.

[0053] Table 5 Detection results of Example 1 and Comparative Example 6

[0054] As can be seen from the results in Table 5, when the composite microbial agent is added synchronously with the organic material and modified bentonite, the average degradation rate of the target pollutants decreases by 14.7 %, the microbial survival amount decreases by 66 %, and the ROS production rate is significantly reduced. Therefore, the "ROS oxidation-biological reinforcement" staged addition strategy proposed in the present application is irreplaceable.

[0055] In summary, through the unique synergistic mechanism and staged degradation strategy, the present application significantly improves the production efficiency of active oxygen free radicals through the synergistic effect of the organic material and modified bentonite, thereby accelerating the degradation of pollutants. At the same time, the staged treatment strategy optimizes resource utilization and reduces remediation costs, and the entire process uses agricultural waste and natural minerals, which is in line with the concept of green remediation and avoids secondary pollution. These innovations make the present application exhibit significant advantages in degradation efficiency, cost control, environmental friendliness, and soil ecosystem remediation.

[0056] The specific embodiments of the present application described above do not constitute a limitation on the scope of protection of the present application. Any various other corresponding changes and modifications made in accordance with the technical concept of the present application shall be included in the scope of protection of the claims of the present application.

Claims

1. A method for the degradation of soil organic pollutants by the synergistic action of active oxygen radicals and organic materials, characterized in that, The method comprises the following steps: S1, ploughing the soil in the target area to obtain pretreated soil; S2, adding a mixture of organic material and modified bentonite to the pretreated soil and mixing evenly to obtain mixed soil A; S3, treating the mixed soil A by dry-wet alternation to obtain activated soil B; S4, adding a compound microbial agent to the activated soil B and degrading to complete the degradation of organic pollutants in the soil by active oxygen free radicals and organic material.

2. The method of soil organic contaminant degradation by reactive oxygen radicals in synergy with organic materials according to claim 1, characterized by that, In step S1, the ploughing depth of the ploughing treatment is 20-30 cm.

3. The method for the synergistic degradation of soil organic pollutants by reactive oxygen free radicals and organic materials according to claim 1, characterized in that, In step S2, when the mixture of organic material and modified bentonite is added to the pretreated soil, the water content of the pretreated soil is 50-80%, and the environmental temperature is 20-30℃.

4. The method of claim 1, wherein the active oxygen radical synergistically degrades soil organic pollutants with the organic material. In step S2, the organic material comprises a mixture of animal manure and straw; The particle size of the organic material is ≤5 mm; The modified bentonite is a porous sodium-based bentonite with a specific surface area > 80 m 2 / g and a pore size of 3-5 nm.

5. The method of soil organic contaminant degradation by active oxygen radicals in synergy with organic materials according to claim 4, characterized by that, The animal manure comprises one or both of chicken manure and pig manure; and the straw comprises one or more of rice straw, wheat straw, and corn straw.

6. The method of soil organic contaminant degradation by reactive oxygen radicals in synergy with organic materials according to claim 1, characterized by that, In step S2, the addition amount of the organic material is 2-3% of the mass of the pretreated soil; and the mass ratio of the organic material to the modified bentonite is (10-20):

1.

7. The method for the synergistic degradation of soil organic pollutants by reactive oxygen free radicals and organic materials according to claim 1, characterized in that, In step S3, the dry-wet alternation treatment specifically comprises: adjusting the water content of the mixed soil A to 60-70% for 24-48 h, then adjusting the water content to 30-40% for 12-24 h, and finally standing for 2-12 h to complete one dry-wet alternation treatment; repeating the dry-wet alternation treatment for 3-5 times.

8. The method of claim 1, wherein the active oxygen radical synergistically degrades soil organic pollutants with the organic material. The amount of the complex microbial agent added in step S4 is 10 7 to 10 8 CFU per kilogram of activated soil B.

9. The method of claim 1, wherein the active oxygen radical synergistically degrades soil organic pollutants with the organic material. In step S4, the compound microbial agent comprises a mixture of Pseudomonas and Bacillus.

10. The method for the synergistic degradation of soil organic pollutants by reactive oxygen free radicals and organic materials according to claim 1, characterized in that, In step S4, the degradation treatment is performed in an aerobic environment, and the conditions of the degradation treatment comprise: a soil water content of 50-60%, a temperature of 25-30℃, and a time of 48-72 h.

Images