A petroleum hydrocarbon contaminated soil remediation process and crushing device

Abstract

The present invention relates to the technical field of soil remediation, and in particular to a process and crushing device for remediating soil contaminated by petroleum hydrocarbons, comprising: accurately formulating a dosage ratio and action time of a chemical agent to ensure sufficient oxidation of the petroleum hydrocarbon pollutants; being equipped with a high-efficiency mixing and crushing device, customizing the crushing angle, mixing frequency, and interval according to the characteristics of the on-site soil to achieve a uniform fusion state of the chemical agent and the soil; and a crushing component comprising a servo motor arranged at the top of the mixing tank, the output end of the servo motor being equipped with a connecting shaft, the end of the connecting shaft being equipped with a hollow shaft, the interior of the hollow shaft being equipped with a driving member, the driving member driving the crushing member to crush and mix the soil, and utilizing an activated persulfate system to achieve a more thorough reaction, thereby reducing the possibility of generating harmful byproducts during the treatment process, and the ingenious design of a limit shaft and a tooth block in the driving member enabling the crushing knife to automatically adapt to different soil hardnesses.

Description

Technical Field

[0001] This invention relates to the field of soil remediation technology, and in particular to a process and crushing device for remediating petroleum hydrocarbon-contaminated soil. Background Technology

[0002] Currently, due to accelerated industrialization, urban expansion, and intensified agricultural activities, soil and groundwater pollution problems are becoming increasingly severe globally, especially in China, where the depth and breadth of soil pollution pose a significant threat to the ecological environment and human health. Soil pollution sources are diverse, including coking plants, pesticide factories, dye factories, coal gasification plants, and gas stations, with major pollutants encompassing benzene compounds, petroleum hydrocarbons, halogenated hydrocarbons, and polycyclic aromatic hydrocarbons (PAHs). Faced with this challenge, the importance of soil remediation technologies is increasingly prominent. Among these, chemical oxidation technology, as an effective means, is gradually becoming a key approach to solving organic pollution. It is particularly suitable for treating organic pollutants that are difficult to remove through biodegradation, such as petroleum hydrocarbons. However, it results in significant secondary pollution after treatment, and soil remediation requires soil fragmentation, which is not suitable for various soil types. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] In view of the serious problem of secondary pollution in soil treatment in the above or existing technologies, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a process for remediating petroleum hydrocarbon-contaminated soil.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: using persulfate activated by sodium hydroxide as the core oxidant, this process triggers the formation of highly oxidizing SO4-· free radicals;

[0007] Precisely determine the dosage ratio and action time of the reagents to ensure the full oxidation of petroleum hydrocarbon pollutants;

[0008] Equipped with a high-efficiency mixing and crushing device, the crushing angle, mixing frequency and interval are customized according to the characteristics of the soil on site to achieve a uniform fusion of the agent and the soil.

[0009] As a preferred embodiment of the petroleum hydrocarbon contaminated soil remediation process of the present invention, the activated persulfate formulation is composed of sodium persulfate and sodium hydroxide mixed in a specific ratio, wherein the molecular weight of sodium persulfate is 238 g / mol and the molecular weight of sodium hydroxide is 40 g / mol.

[0010] As a preferred embodiment of the petroleum hydrocarbon contaminated soil remediation process of the present invention, the operation process is as follows:

[0011] First, excavate the contaminated soil;

[0012] Apply activated persulfate at the optimized ratio;

[0013] Using specially selected high-efficiency crushing and mixing equipment, two to three mixing steps are implemented to ensure complete dispersion of the agent;

[0014] Control the soil moisture content within the ideal range and conduct self-inspection during the maintenance phase to monitor the progress of remediation.

[0015] After the quality inspection is completed, the soil will be repaired and backfilled at the original location or further treatment measures will be taken.

[0016] As a preferred embodiment of the petroleum hydrocarbon contaminated soil remediation process of the present invention, the activated persulfate preparation specifically designed for chemical oxidation remediation of petroleum hydrocarbon contaminated soil includes an optimized ratio of sodium persulfate to sodium hydroxide in the formulation, specifically designed to enhance the oxidative decomposition efficiency of petroleum hydrocarbon pollutants in specific soils.

[0017] The beneficial effects of the petroleum hydrocarbon contaminated soil remediation process of this invention are as follows: This invention greatly enhances the oxidation capacity through the generation of SO4-· free radicals, exhibiting high degradation efficiency for various petroleum hydrocarbon pollutants. Even stubborn organic pollutants can be effectively removed, improving the remediation success rate. Compared with traditional remediation methods, the activated persulfate system utilized in this invention results in a more thorough reaction, reducing the possibility of generating harmful byproducts during the treatment process. This effectively avoids secondary pollution problems during soil treatment, meeting the environmental protection requirements of green and sustainable development. This is achieved through precise formulation of reagent dosage ratios and action times, as well as the use of a highly efficient mixing and crushing device customized according to soil characteristics. The remediation process has been highly optimized, ensuring full utilization of the agents and adapting to the specific needs of different soil types. This has improved the targeting and effectiveness of the remediation. The clear operating procedures have simplified the remediation work. From excavation, agent application, mixing to maintenance and monitoring, each step has been optimized, shortening the remediation cycle and reducing manpower and resource consumption. Overall, this has improved the economic efficiency and feasibility of the remediation project. The remediated soil undergoes rigorous quality testing to ensure its safety and harmlessness before backfilling or further treatment. This promotes the rapid restoration and rational reuse of contaminated land, which is of great significance for protecting and restoring the ecological environment and ensuring the sustainable use of land resources.

[0018] In practical use, there is still a problem that the crushing device cannot be selected according to the soil type.

[0019] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a soil remediation crushing device includes a mixing component, including a mixing tank, a material guide port installed at the top of the mixing tank, a chemical guide component installed at the top of the mixing tank, and the mixing tank is reinforced by a support frame;

[0020] The crushing assembly includes a servo motor mounted on the top of the mixing tank. The output end of the servo motor is equipped with a connecting shaft, and the end of the connecting shaft is equipped with a hollow shaft. A driving component is disposed inside the hollow shaft, and the driving component drives the crushing assembly to crush and mix the soil.

[0021] In a preferred embodiment of the soil remediation and breaking device of the present invention, the guiding component includes a guiding port disposed at the top of the mixing tank, the guiding port being connected by a pipe, a pressure pump being installed at the bottom end of the pipe, and a branch pipe being disposed on the side wall of the pipe.

[0022] In a preferred embodiment of the soil remediation and breaking device of the present invention, the driving component includes a limiting shaft disposed on the inner wall of the hollow shaft, the limiting shaft having a triangular top view, and a limiting plate being installed at the end of the limiting shaft.

[0023] In a preferred embodiment of the soil remediation and breaking device of the present invention, the driving component further includes an inclined surface disposed on the side wall of the limiting plate, the inclined surface is provided with toothed blocks, and the limiting plate is located at the three ends of the limiting shaft triangle, and the limiting plate is arranged in a cross shape.

[0024] In a preferred embodiment of the soil remediation crushing device of the present invention, the crushing component includes a drive gear disposed in the triangular groove of the limiting shaft, a driven gear at the end of the drive gear, the drive gear and the driven gear being sleeved on the side wall of the fixed shaft, and a one-way bearing being installed at the connection between the drive gear and the driven gear and the fixed shaft.

[0025] In a preferred embodiment of the soil remediation crushing device of the present invention, the crushing component further includes a crushing blade disposed at the end of the fixed shaft. The crushing blade is arc-shaped, and the front view of the crushing blade is thicker in the middle and thinner at both ends. The crushing blade is connected to the fixed shaft by screws, and the crushing blade is driven by a telescopic cylinder.

[0026] The beneficial effects of the soil remediation crushing device of this invention are as follows: Through the ingenious design of the limiting shaft and toothed blocks in the drive component, the crushing blade achieves automatic adaptive adjustment to different soil hardness levels. This design automatically adjusts the working angle and force of the crushing blade according to the actual soil conditions, making it suitable for powerful crushing of hard soils while maintaining high efficiency and reducing unnecessary energy consumption in soft soils. The arc-shaped design of the crushing blade, thicker in the middle and thinner at both ends, increases its ability to penetrate the soil while reducing soil resistance, thus significantly improving crushing efficiency. This design can more thoroughly crush soil clumps, allowing chemical oxidizing agents to contact pollutants in the soil more evenly and deeply, improving the remediation effect. The device achieves automated crushing through a servo motor and a series of mechanical linkages, reducing the need for manual intervention and lowering operational difficulty and labor costs. Simultaneously, the application of one-way bearings avoids the possibility of reverse transmission, protecting the equipment and reducing the failure rate. In the long term, it can effectively reduce maintenance costs. The efficient crushing and agent mixing process reduces secondary environmental pollution during the remediation process, such as reducing energy consumption, noise, and excessive use of agents. By precisely controlling the application of chemicals and the fragmentation process, the system ensures the high efficiency and environmental friendliness of remediation operations, promoting the sustainable development of soil remediation technology. The modular design and flexible drive mechanism of the device offer possibilities for future technology upgrades and customized remediation solutions. Depending on different soil types and levels of contamination, the specific configuration of the drive components can be adjusted, and fragmentation components can be added or improved to adapt to a wider range of remediation needs, enhancing the technology's practicality and market competitiveness. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0028] Figure 1 A schematic diagram of the remediation route used in the remediation process for petroleum hydrocarbon-contaminated soil.

[0029] Figure 2 A schematic diagram of the overall structure of a soil remediation crushing device.

[0030] Figure 3 A schematic diagram of the structure of the crushing component used in the soil remediation crushing device.

[0031] Figure 4 A schematic diagram of the drive component for a soil remediation crushing device.

[0032] Figure 5 A cross-sectional view of the drive component structure for a soil remediation crushing device.

[0033] Figure 6 for Figure 4 A magnified structural diagram of point A in the middle.

[0034] Figure 7 A schematic diagram of the disassembly structure of the soil remediation crushing device using a crushing blade.

[0035] Figure 8 Front view of the cutting blade used in a soil remediation crushing device.

[0036] Figure label:

[0037] 100. Mixing assembly; 101. Mixing tank; 102. Feed inlet; 103. Drug guide; 104. Support frame;

[0038] 103a, Drug delivery port; 103b, Pipeline; 103c, Booster pump; 103d, Branch pipe;

[0039] 200. Crushing assembly; 201. Servo motor; 202. Connecting shaft; 203. Hollow shaft; 204. Drive component; 205. Crushing component;

[0040] 204a, limiting shaft; 204b, limiting plate; 204c, inclined plane; 204d, toothed block;

[0041] 205a, drive gear; 205b, driven gear; 205c, fixed shaft; 205d, one-way bearing; 205e, breaker blade; 205f, screw; 205g, telescopic cylinder. Detailed Implementation

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0044] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0045] Example 1

[0046] Reference Figure 1This is the first embodiment of the present invention, which provides a process for remediating petroleum hydrocarbon-contaminated soil.

[0047] Specifically, persulfate activated by sodium hydroxide is used as the core oxidant, a process that triggers the formation of highly oxidizing SO4-· free radicals;

[0048] Precisely determine the dosage ratio and action time of the reagents to ensure the full oxidation of petroleum hydrocarbon pollutants;

[0049] Equipped with a high-efficiency mixing and crushing device, the crushing angle, mixing frequency and interval are customized according to the characteristics of the soil on site to achieve a uniform fusion of the agent and the soil.

[0050] Furthermore, the activated persulfate formulation is composed of sodium persulfate (Na2S2O8) and sodium hydroxide (NaOH) mixed in a specific ratio, wherein the molecular weight of sodium persulfate is 238 g / mol and the molecular weight of sodium hydroxide is 40 g / mol.

[0051] Further, the operating procedure:

[0052] First, excavate the contaminated soil;

[0053] Apply activated persulfate at the optimized ratio;

[0054] Using specially selected high-efficiency crushing and mixing equipment, two to three mixing steps are implemented to ensure complete dispersion of the agent;

[0055] Control the soil moisture content within the ideal range and conduct self-inspection during the maintenance phase to monitor the progress of remediation.

[0056] After the quality inspection is completed, the soil will be repaired and backfilled at the original location or further treatment measures will be taken.

[0057] A preferred activated persulfate formulation specifically designed for the chemical oxidation remediation of petroleum hydrocarbon-contaminated soils: the ratio of sodium persulfate to sodium hydroxide in the formulation is optimized to specifically enhance the oxidative decomposition efficiency of petroleum hydrocarbon pollutants in specific soils.

[0058] In response to the actual situation of petroleum hydrocarbon-contaminated soil in Haizhu District, Guangzhou, a research experiment was conducted on the "chemical oxidation remediation of single petroleum hydrocarbons" process.

[0059] 1. Experimental Objective

[0060] (1) The feasibility of chemical oxidation remediation technology for organic polluted soil in this plot was verified by the results of a small-scale chemical oxidation test.

[0061] (2) The remediation effect on different soil types, concentrations and pollutants at this site was verified through small-scale chemical oxidation tests;

[0062] (3) Determine the optimal process parameters suitable for soil pollution remediation at this site through small-scale chemical oxidation tests;

[0063] (4) Develop a repair technology plan based on the optimal process parameters determined by small-scale chemical oxidation tests;

[0064] 2. Experimental Principle

[0065] The soil at this contaminated site to be remediated by chemical oxidation is characterized by organic pollutants, and the aim is to verify the oxidation effect of chemical oxidation on organic polluted soil.

[0066] Chemical oxidation remediation technology mainly relies on adding chemical oxidants to the soil to generate strong oxidizing free radicals, which can oxidize and degrade organic pollutants into carbon dioxide or low-toxicity organic intermediates. The type of free radicals generated by the oxidant, the effective reaction time, and the stability determine the application mode of oxidation. Therefore, suitable agents are screened by analyzing the above indicators.

[0067] The oxidants selected in chemical oxidation remediation technology mainly include Fenton's reagent, hydrogen peroxide, and sodium persulfate.

[0068] This project requires relatively little chemical oxidation work, has a short construction period, and therefore necessitates the selection of readily available and stable chemicals. According to the State Council's "Regulations on the Safety Management of Hazardous Chemicals," the Ministry of Public Security's "Administrative Measures for the Purchase and Road Transport Permits of Highly Toxic Chemicals," and the relevant administrative licensing disclosure regulations of the Municipal Public Security Bureau, the hydrogen peroxide registration process requires obtaining a "Permit for the Purchase of Highly Toxic Substances" from the Municipal Public Security Bureau's permit office, which is time-consuming and necessitates the construction of a hazardous chemical storage warehouse. Therefore, we chose alkali-activated persulfate.

[0069] The use of activated persulfate enhances its ability to degrade organic matter. Persulfate ionizes in water to produce persulfate ions (S₂O₈). 2- Its standard redox potential is E0 = +2.01V (relative to the standard hydrogen electrode), close to that of ozone (E0 = +2.07V). Its molecule contains the peroxy group -OO-, making it a relatively strong oxidizing agent. Under activation conditions, S2O8... 2- It can be activated and decomposed into SO4. - SO4 - It contains a lone pair of electrons, and its standard redox potential E0 = +2.60V, which is much higher than that of S2O8. 2- (E0 = +2.01V), close to that of hydroxyl radicals (E0 = +2.80V), thus exhibiting a strong ability to degrade organic pollutants. Alkali activation promotes the generation of sulfate and hydroxyl radicals, enhancing the degradation capacity for organic matter; it also regulates soil pH, preventing sulfate from combining with hydrogen ions to form sulfuric acid, thereby avoiding secondary pollution problems such as soil acidification.

[0070] 3. Drug selection

[0071] This experiment used activated sodium persulfate (activated with sodium hydroxide) for a small-scale test. Activated persulfate refers to persulfate that, through chemical catalysis, forms hydroxyl radicals and sulfate ions, continuously providing highly oxidizing free radicals in contaminated soil.

[0072] We selected an alkaline-activated sodium persulfate oxidizing agent, the composition of which is shown in the table below.

[0073] 1. Pharmaceutical composition

[0074] Drug type Drug Name Molecular formula Molecular mass (g / mol) Oxidizing agents Sodium persulfate <![CDATA[Na2S2O8]]> 238 Activator Sodium hydroxide NaOH 40

[0075] 4. Experimental materials and equipment

[0076] Experimental consumables: beakers, spatulas, sieving equipment, etc.

[0077] Instruments: glass rod, electronic balance.

[0078] Chemicals: Sodium persulfate, sodium hydroxide.

[0079] Other: gloves, resealable bags.

[0080] 5. Collection of representative samples on site

[0081] According to the requirements of the "Technical Specification for the Preparation of Pollution Remediation Plans - Part 2: Prevention and Control of Soil Pollution in Construction Land" (DB4401 / T102.2—2021), laboratory pilot tests should collect representative soil samples based on the pollution type and concentration gradient of the contaminated soil, including at least soil samples from heavily polluted areas. For sites with a remediation volume of less than 2000 m³, at least one sampling unit should be set up, with at least three samples collected from each unit. Based on the preliminary site investigation data and wind assessment results, this project only contains organic petroleum hydrocarbons (C). 10 -C 40 The amount of pollutants, including organic matter contaminated soil, is 213.49 m3.

[0082] Soil samples collected on-site were thoroughly mixed, sealed, and stored, and a small-scale ex-situ chemical oxidation test was conducted promptly. On-site sampling was carried out strictly in accordance with the relevant requirements of the "Technical Guidelines for Soil Sampling in Soil Quality" GB / T36197-2018.

[0083] According to the site survey report, the collected petroleum hydrocarbons (C 10 -C 40Three soil samples were collected from site NBJ12 (X = 2553501.198, Y = 424158.883) at a depth of 1-2 m. The collected soil samples were thoroughly mixed on-site, sealed, and then immediately subjected to a small-scale ex-situ chemical oxidation test. On-site sampling was conducted strictly in accordance with the relevant requirements of the "Technical Guidelines for Soil Sampling in Soil Quality" GB / T36197-2018.

[0084] According to the "Soil Pollution Risk Assessment Report (Recordation) of Plot No. 45, Nanbian Road, Haizhu District, Guangzhou", the concentration of petroleum hydrocarbons at this site is 3010 mg / kg, which exceeds the remediation target by 1.52 times. The pollution concentration at this site is the highest value of the pollution concentration in the site and is highly representative, which can provide more reliable judgment conditions for subsequent remediation work.

[0085] 6. Experimental Design

[0086] After thoroughly mixing the three collected samples, a control sample (sample 0) was set up. Sodium persulfate was then used as the chemical oxidizing agent to establish the following control groups. The amounts of sodium persulfate added were set at 0.5%, 1%, 2%, 3%, and 5%.

[0087] The sodium hydroxide addition ratios were set at 0.1%, 0.2%, 0.4%, 0.6%, and 0.8% (ensuring the pH was between 9 and 11 during the experiment); the soil moisture content was maintained at around 30% by adding water during the small-scale test.

[0088] Each experiment was repeated three times to ensure the scientific validity of the results. The experimental design is shown in the table below:

[0089] Table 1.1.1 Experimental Design Scheme for Small-Scale Chemical Oxidation

[0090] Serial Number Sodium persulfate Sodium hydroxide Post-test numbering Remark 1 / / Sample 0 2 0.5％ 0.1％ Sample 1-1 Supplemental testing of intermediate products 3 0.5％ 0.1％ Sample 1-2 4 0.5％ 0.1％ Samples 1-3 5 1％ 0.2％ Sample 2-1 Supplemental testing of intermediate products 6 1％ 0.2％ Sample 2-2 7 1％ 0.2％ Samples 2-4 8 2％ 0.4％ Sample 3-1 9 2％ 0.4％ Sample 3-2 10 2％ 0.4％ Sample 3-3 11 3％ 0.6％ Sample 4-1 Supplemental testing of intermediate products 12 3％ 0.6％ Sample 4-2 13 3％ 0.6％ Sample 4-3 14 5％ 1％ Sample 5-1 15 5％ 1％ Sample 5-2 16 5％ 1％ Sample 5-3

[0091] 7. Processing Procedure

[0092] 1) Sample pretreatment: After the petroleum hydrocarbon soil samples were brought back to the laboratory, they were sorted and spread out to air dry until the moisture content was 10% to 20%. Stones, wood chips and other debris larger than 10 mm were removed, the samples were mixed and then freeze-dried.

[0093] 2) Mixing of reagents: Weigh 500g of each test sample and add oxidizing agent to each soil sample according to the addition ratio requirements of 0.5%, 1%, 2%, 3%, and 5% in the treatment design table.

[0094] 3) After the medicine is fully mixed, add an appropriate amount of water and stir thoroughly.

[0095] 4) Curing: Place the soil after adding the medicine and mixing it evenly in a glass bottle, keep the moisture content at about 30% to 35%, and send it for testing after 5 days of curing.

[0096] 8. Experimental Results

[0097] After static curing, samples were collected and tested. The test results are as follows.

[0098] 1. Soil organic matter content after treatment with different concentrations of oxidant

[0099] Serial Number Sodium persulfate Sodium hydroxide Sample number <![CDATA[Petroleum hydrocarbons (C 10 -C 40 ) mg / kg]]> 1 / / Sample 0 <![CDATA[3.61×10 3 <!-- 6 -->]]> 2 0.5％ 0.1％ Sample 1-1 <![CDATA[1.77×10 3 ]]> 3 0.5％ 0.1％ Sample 1-2 <![CDATA[1.86×10 3 ]]> 4 0.5％ 0.1％ Samples 1-3 <![CDATA[1.81×10 3 ]]> 5 1％ 0.2％ Sample 2-1 916 6 1％ 0.2％ Sample 2-2 910 7 1％ 0.2％ Sample 2-3 886 8 2％ 0.4％ Sample 3-1 87 9 2％ 0.4％ Sample 3-2 82 10 2％ 0.4％ Sample 3-3 92 11 3％ 0.6％ Sample 4-1 13 12 3％ 0.6％ Sample 4-2 10 13 3％ 0.6％ Sample 4-3 10 14 5％ 1％ Sample 5-1 ND 15 5％ 1％ Sample 5-2 ND 16 5％ 1％ Sample 5-3 ND

[0100] 1.1.1.2 Feasibility Analysis

[0101] The amount of organically contaminated soil to be treated in this project is relatively small, totaling 213.49 m³. 3 The organic pollution in the soil exceeded the standard by about 1.52 times, which is a relatively low concentration.

[0102] A small-scale chemical oxidation test was conducted, using soil samples from the highest pollution concentration point as the collection point for organic pollutants. The dosage of the chemical oxidizing agent was set in a gradient from 0% to 5% to verify the optimal dosage. Results showed that when the organic oxidizing agent dosage was 0.5% and sodium hydroxide dosage was 0.1%, the concentration of petroleum hydrocarbons (C...) was significantly reduced. 10 -C 40 The pollution concentration can reach the remediation target value, but the concentration value is quite close to the remediation target value; the dosage ratio of organic oxidants is 1% sodium persulfate, 0.2% sodium hydroxide, and petroleum hydrocarbons (C 10 -C 40 The pollution concentration can reach the remediation target value, and the concentration value is far lower than the remediation target value. It is conservatively estimated that in the construction of chemical oxidation remediation of organic polluted soil, the agent addition ratio of 1% sodium persulfate and 0.2% sodium hydroxide (the specific ratio should be adjusted appropriately according to the actual organic pollution concentration of the soil) can meet the oxidation requirements of soil organic pollutants in this project.

[0103] The treatment process is simple; it is applicable to a wide range of pollutants, has a short remediation period, low remediation cost, and causes fewer secondary soil pollution problems.

[0104] Example 2

[0105] Reference Figure 2 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a petroleum hydrocarbon contaminated soil remediation process with the core of an improved mixing component 100, which solves the problems of specific soil remediation efficiency and agent application control, and includes...

[0106] Specifically, the mixing assembly 100 includes a mixing tank 101, a feed inlet 102 installed at the top of the mixing tank 101, a drug guide 103 installed at the top of the mixing tank 101, and the mixing tank 101 is reinforced by a support frame 104.

[0107] Furthermore, the drug delivery component 103 includes a drug delivery port 103a located at the top of the mixing tank 101. The drug delivery port 103a is connected via a pipe 103b. A pressure pump 103c is installed at the bottom end of the pipe 103b, and a branch pipe 103d is provided on the side wall of the pipe 103b.

[0108] Operating Procedure: First, ensure all equipment is in a ready state, especially that mixing tank 101 has been properly cleaned and prepared to receive the contaminated soil to be remediated. The design of mixing tank 101 reinforces structural stability, and the support frame 104 ensures it can withstand the corresponding loads and operating pressures during soil treatment. Next, the excavated petroleum hydrocarbon contaminated soil is introduced into mixing tank 101 through inlet 102. This process may involve using a forklift or other mechanical tools to ensure the soil is evenly distributed inside the mixing tank, preparing it for the next step of treatment. Following this, the chemical application stage begins. The chemical guide 103 plays a crucial role; its inlet 103a is located at the top of mixing tank 101 and is connected to the chemical storage and supply system via pipe 103b. Operators or the automated system activate pressurized pump 103c, which pressurizes and delivers the pre-prepared chemical oxidizing agent (such as the previously mentioned active sodium persulfate solution) into mixing tank 101 through pipe 103b. A branch pipe 103d is also installed on the side wall of pipe 103b to regulate the flow rate of the replenishing agent, ensuring that the agent is added to the soil evenly and accurately according to the predetermined ratio and rate. Simultaneously with the agent injection, the agitator inside mixing tank 101 is activated to thoroughly mix the soil and agent. Depending on the soil characteristics and degree of contamination, the agitation speed and time are preset or adjusted in real time based on actual monitoring results to achieve optimal chemical oxidation reaction conditions. After the mixing process is complete, the petroleum hydrocarbon pollutants in the soil are gradually transformed into harmless or low-toxicity substances under the action of the chemical oxidant. Afterwards, the soil in the mixing tank needs to undergo a certain period of curing, during which it may be agitated multiple times to ensure a complete chemical reaction. Simultaneously, various soil indicators, such as pH value, moisture content, and pollutant residue levels, are monitored to assess the remediation effect. Finally, once the soil tests meet the standards, the treated soil is discharged through the outlet at the bottom of mixing tank 101 for subsequent site backfilling or further treatment. The entire operation process embodies the characteristics of automation and precise control, effectively improving the efficiency and quality of petroleum hydrocarbon contaminated soil remediation.

[0109] Example 3

[0110] Reference Figures 3-8This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a soil remediation crushing device. Through precise mechanical linkage and an innovative gear transmission system, it achieves intelligent adaptive crushing of soils with different hardnesses. The design of the limiting shaft and toothed blocks allows for adjustment of the angle and rotation direction of the crushing blades as needed, thereby automatically adapting to soil conditions without adding extra complex operations, improving the efficiency and flexibility of remediation operations.

[0111] Specifically, the crushing component 200 includes a servo motor 201 mounted at the top of the mixing tank 101. A connecting shaft 202 is installed at the output end of the servo motor 201, and a hollow shaft 203 is installed at the end of the connecting shaft 202. A drive component 204 is installed inside the hollow shaft 203. The drive component 204 drives the crushing component 205 to crush and mix the soil. After the servo motor 201 starts, it transmits power through the connecting shaft 202 at its output end, thereby driving the hollow shaft 203 to rotate. The drive component 204 inside the hollow shaft 203 then begins to operate.

[0112] Furthermore, the driving component 204 includes a limiting shaft 204a disposed on the inner wall of the hollow shaft 203. The limiting shaft 204a is triangular in plan view, and a limiting plate 204b is installed at the end of the limiting shaft 204a. The limiting shaft 204a is triangular in layout, and the limiting plate 204b is cross-shaped at the three ends of the limiting shaft 204a.

[0113] Furthermore, the driving component 204 also includes an inclined surface 204c disposed on the side wall of the limiting plate 204b. A toothed block 204d is disposed on the inclined surface 204c. The limiting plate 204b is located at the three ends of the triangle of the limiting shaft 204a and is arranged in a cross shape. When the limiting shaft 204a rotates with the hollow shaft 203, the toothed block 204d on the inclined surface interacts with the driving gear 205a and the driven gear 205b. A specific direction of movement (up and down) of the limiting shaft 204a causes the toothed block 204d to push the driving gear 205a or the driven gear 205b to rotate. The one-way bearing 205d ensures control over the direction of gear rotation.

[0114] Furthermore, the crushing component 205 includes a drive gear 205a disposed in the triangular slot of the limiting shaft 204a, a driven gear 205b at the end of the drive gear 205a, the drive gear 205a and the driven gear 205b being sleeved on the side wall of the fixed shaft 205c, and a one-way bearing 205d being installed at the connection between the drive gear 205a and the driven gear 205b and the fixed shaft 205c. The drive gear 205a interacts directly with the tooth block on the limiting shaft 204a, and its rotational motion is transmitted to the crushing blade 205e via the fixed shaft 205c, thereby realizing the angle adjustment of the crushing blade 205e.

[0115] Furthermore, the crushing component 205 also includes a crushing blade 205e disposed at the end of the fixed shaft 205c. The crushing blade 205e is arc-shaped, and its front view shows a thickness in the middle and a thinning at both ends. The crushing blade 205e is connected to the fixed shaft 205c by screws 205f and is driven by a telescopic cylinder 205g. The arc-shaped design of the crushing blade 205e, with its thicker middle and thinner ends, facilitates insertion into the soil and improves crushing efficiency while reducing resistance. The crushing blade 205e is fixed to the fixed shaft 205c by screws 205f, ensuring stability and reliability during high-speed rotation and crushing.

[0116] Operation process: In use, first start the servo motor 201 to drive the connecting shaft 202 to rotate. The rotating connecting shaft 202 drives the hollow shaft 203 to rotate. Since the crushing blade 205e is installed on the side wall of the hollow shaft 203, the rotating hollow shaft 203 drives the crushing blade 205e to rotate and crush the soil. When it is necessary to adjust the angle of the crushing blade 205e according to the soil hardness, start the telescopic cylinder 205g to drive the limit shaft 204a to move up and down. Since the side wall of the limit shaft 204a is equipped with toothed blocks 204d, therefore... The moving limiting shaft 204a drives the toothed blocks 204d to move. The toothed blocks 204d have three sets located within the concave positions of the limiting shaft 204a, and each set has toothed blocks 204d on two sidewalls. The toothed blocks 204d on the two sidewalls mesh with the driving gear 205a and the driven gear 205b, respectively. Therefore, when moving upwards, one side of the toothed blocks 204d in one set drives the driving gear 205a to rotate. The rotating driving gear 205a then drives the crusher blade 205e to rotate for angle adjustment, while the other... The side toothed block 204d drives the driven gear 205b to rotate. Due to the action of the one-way bearing 205d, the driven gear 205b does not drive the crusher 205e to rotate. Conversely, when the limit shaft 204a moves downwards, the driven gear 205b drives the crusher 205e to adjust its rotation angle, while the drive gear 205a, under the action of the one-way bearing 205d, does not drive the crusher 205e to rotate. Therefore, the crusher 205e can automatically change from an acute angle to a variable angle according to the soil hardness without the need for external installation or replacement. The obtuse angle improves crushing efficiency, and the triangular setting of the limiting shaft 204a effectively limits the drive gear 205a and the driven gear 205b. Then, the pressurizing pump 103c is started to guide the liquid in the branch pipe 103d into the inside of the pipe 103b and into the drug inlet 103a. The drug is then introduced into the mixing tank 101 through the drug inlet 103a for mixing. When the device needs to be repaired, the ladder on the support frame 104 can be used to reach the feed inlet 102 and enter the mixing tank 101 for repair. The crushing blade 205e is also included.

[0117] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0118] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0119] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0120] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A soil remediation and crushing device, characterized in that: include, The mixing assembly (100) includes a mixing tank (101), a feed inlet (102) installed at the top of the mixing tank (101), a drug guide (103) installed at the top of the mixing tank (101), and the mixing tank (101) is reinforced by a support frame (104); The crushing assembly (200) includes a servo motor (201) disposed at the top of the mixing tank (101), a connecting shaft (202) is installed at the output end of the servo motor (201), a hollow shaft (203) is installed at the end of the connecting shaft (202), and a driving component (204) is disposed inside the hollow shaft (203). The driving component (204) drives the crushing assembly (205) to crush and mix the soil. The driving component (204) includes a limiting shaft (204a) disposed on the inner wall of the hollow shaft (203). The limiting shaft (204a) is triangular in plan view, and a limiting plate (204b) is installed at the end of the limiting shaft (204a). The limiting plate (204b) is cross-shaped. The driving component (204) further includes an inclined surface (204c) disposed on the side wall of the limiting plate (204b), a toothed block (204d) is disposed on the inclined surface (204c), and the limiting plate (204b) is located at the three ends of the triangle of the limiting shaft (204a); The crushing component (205) includes a drive gear (205a) disposed in the triangular slot of the limiting shaft (204a), a driven gear (205b) at the end of the drive gear (205a), the drive gear (205a) and the driven gear (205b) being sleeved on the side wall of the fixed shaft (205c), and a one-way bearing (205d) being installed at the connection between the drive gear (205a) and the driven gear (205b) and the fixed shaft (205c). The crushing component (205) also includes a crushing blade (205e) disposed at the end of the fixed shaft (205c). The crushing blade (205e) is arc-shaped, and the front view of the crushing blade (205e) is thick in the middle and thin at both ends. The crushing blade (205e) is connected to the fixed shaft (205c) by screws (205f), and the crushing blade (205e) is driven by a telescopic cylinder (205g). The soil remediation crushing device is used in the remediation process of petroleum hydrocarbon-contaminated soil, which includes the application of persulfate activated by sodium hydroxide as the core oxidant. This process triggers the formation of highly oxidizing SO4-• free radicals. Precisely determine the dosage ratio and action time of the reagents to ensure the full oxidation of petroleum hydrocarbon pollutants; Equipped with a high-efficiency mixing and crushing device, the crushing angle, mixing frequency and interval are customized according to the characteristics of the soil on site to achieve a uniform fusion of the agent and the soil.

2. The soil remediation and breaking device as described in claim 1, characterized in that: Activated persulfate formulation: Sodium persulfate and sodium hydroxide are mixed in a specific ratio, wherein the molecular weight of sodium persulfate is 238 g / mol and the molecular weight of sodium hydroxide is 40 g / mol.

3. The soil remediation and crushing device as described in claim 1 or 2, characterized in that: Operation process: First, excavate the contaminated soil; Apply activated persulfate at the optimized ratio; Using specially selected high-efficiency crushing and mixing equipment, two to three mixing steps are implemented to ensure complete dispersion of the agent; Control the soil moisture content within the ideal range and conduct self-inspection during the maintenance phase to monitor the progress of remediation. After the quality inspection is completed, the soil will be repaired and backfilled at the original location or further treatment measures will be taken.

4. The soil remediation and breaking device as described in claim 3, characterized in that: An activated persulfate formulation specifically designed for the chemical oxidation remediation of petroleum hydrocarbon-contaminated soil: The ratio of sodium persulfate to sodium hydroxide in the formula has been optimized to specifically enhance the oxidative decomposition efficiency of petroleum hydrocarbon pollutants in specific soils.

5. The soil remediation and breaking device as described in claim 4, characterized in that: The drug delivery component (103) includes a drug delivery port (103a) located at the top of the mixing tank (101). The drug delivery port (103a) is connected via a pipe (103b). A pressure pump (103c) is installed at the bottom end of the pipe (103b). A branch pipe (103d) is provided on the side wall of the pipe (103b).

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