CN114535284A - In-situ heat-enhanced chemical redox coupling repair method for composite organic polluted site - Google Patents

Abstract

The invention discloses an in-situ thermal-enhanced chemical oxidation-reduction coupling restoration method for a compound organic polluted site, comprising: S1, determining a pollution treatment boundary, and then setting a partition wall; determining the dosage of a restoration agent according to the type and content of organic pollutants in the soil; and finally Adjust the pH and water content of the soil; S2. Lay out injection wells, heating wells and monitoring wells within the pollution treatment boundary; S3. Pour remediation agents into the injection wells and hot steam into the heating wells; S4. Use the monitoring wells The monitoring equipment of the invention monitors the restoration effect of the compound organic polluted site; the present invention has reasonable design and remarkable restoration effect of the compound organic pollution site, and is suitable for popularization and use.

Description

In situ thermally enhanced chemical redox coupled remediation method for compound organic pollution sites

technical field

The invention relates to the technical field of soil remediation, in particular to an in-situ thermally enhanced chemical redox coupling remediation method for composite organic polluted sites.

Background technique

Organic pollution sites refer to the space areas that carry organic pollutants due to accumulation, storage, treatment, disposal or other means, which are harmful to human health and the environment or have potential risks. The carriers of pollutants in polluted sites include site soil, site groundwater, site surface water, site ambient air, and site residual waste pollutants such as production equipment and buildings, structures, and organisms. Compared with the atmosphere and water, the soil is the main collection place of pollutants. Compared with the atmosphere and water, the soil has a much larger capacity to accommodate pollutants. The pollutants entering the soil are generally concealed, delayed and accumulated, which leads to soil remediation The governance is difficult, the repair cycle is long, and the cost is high. Moreover, the causes of soil pollution in different regions are different, the components and types of pollutants contained are different, and the restoration methods are also different, which increases the difficulty of soil organic pollution restoration.

According to different methods and principles, contaminated soil remediation technologies can be divided into physical remediation, chemical remediation and bioremediation. Among them, chemical remediation technologies include chemical leaching technology, chemical reduction and reductive dechlorination remediation technology, chemical oxidation remediation technology, solvent extraction technology and soil performance improvement and remediation technology. Because physical remediation usually transfers or fixes pollutants, it has the disadvantage of incomplete remediation; while bioremediation usually takes a long time, chemical remediation technology has the advantages of short remediation time and complete degradation, so chemical remediation is increasingly used. Applied to the restoration of polluted sites.

SUMMARY OF THE INVENTION

In view of the above existing technical problems, the present invention provides an in-situ thermally enhanced chemical redox coupling repair method for composite organic polluted sites with short repair period and remarkable effect.

The technical scheme of the present invention is: an in-situ thermal strengthening chemical redox coupling repair method for a compound organic polluted site, comprising the following steps:

S1. Pretreatment of contaminated sites;

S1-1. Determine the pollution treatment boundary of the contaminated site and the depth of the contaminated soil, and carry out leveling and compaction treatment; then use trenching equipment to excavate an isolation groove with a width of 20-45 cm at the pollution treatment boundary, and lay out isolation in the isolation groove Retaining wall; wherein, the excavation depth of the isolation groove is greater than the depth of the contaminated soil by 30-55cm;

S1-2, take a 50-100cm ³ contaminated soil sample within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the contaminated soil, and calculate the amount of remediation chemicals; Amount = volume of contaminated soil × amount of contaminated soil remediation agent per unit volume;

S1-3. Add dilute nitric acid with a volume concentration of 15-30% to the soil within the pollution treatment boundary determined in step S1-1, adjust the pH of the polluted soil to 6-7, and then inject water into the polluted soil to control the moisture content of the polluted soil 25～40wt%;

S2, equipment layout;

S2-1. Arrange multiple injection wells with a spacing of 8-10m in the contaminated soil area; then arrange heating wells between two adjacent injection wells;

S2-2. Arrange a drug injection screen in the drug injection well, and fill quartz sand between the drug injection screen and the inner wall of the drug injection well; then arrange a heating pipe in the heating well, and a heat dissipation groove is opened on the wall of the heating pipe;

S2-3. Arrange the steam hot air blower and the medicine storage box outside the pollution treatment boundary. The steam hot air blower is connected with the heating pipe through the pipeline, and the medicine storage box is connected with the medicine injection screen. Between the steam hot air blower and the heating pipe, A flow valve is arranged between the medicine storage box and the medicine injection screen;

S2-4. A plurality of monitoring wells are evenly arranged in the contaminated soil area, and the monitoring wells are arranged at intervals from the heating well and the injection well;

S3, repair management;

S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 5-9kPa, the air volume to be 80-130m ³ /h, and the air outlet temperature to be 400-750°C;

S3-2. Use high-pressure injection equipment to intermittently inject the repairing agent into the polluted soil through the injection screen, control the pressure of the high-pressure injection equipment to be 3-7 kPa, and the injection amount of the repairing agent is calculated according to step S1-2; The interval time of the medicine is 3 to 5 hours, and the number of times is 2 to 6;

S4. Monitoring;

Deploy monitoring equipment in the monitoring well, and use the monitoring equipment to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset target, repeat step S3 , until the restoration effect of the organically polluted site reaches the preset target.

Further, in step S1-2, the repairing agent includes the following raw materials by weight: 15-25 parts of activated iron, 5-9 parts of plant polysaccharides, 3-7 parts of polyvinyl alcohol, and 20-45 parts of deionized water; wherein, Activated iron is activated by reduced iron powder with a particle size of 15-45 nm; by adding iron-based remediation agents to the polluted soil, the refractory halogenated hydrocarbons and nitro-type organic compounds in the composite organic polluted soil can be derived are effectively removed.

Further, in step S1-1, the trenching equipment includes an equipment box, an operation frame, a toothed disc and a power motor; a cavity is arranged inside the equipment box, and a moving roller is arranged at the lower end of the equipment box; a connecting block is movably sleeved on the operation frame , the operation frame is hinged inside the cavity through the connecting block, the upper end of the operation frame is provided with a push ring, the lower end is provided with a mounting plate, and there are two installation plates. The lower end is connected with a limit plate for fixing the installation plate by bolts; there are two toothed discs, the two toothed discs are respectively clamped on opposite sides of the two installation plates by rotating shafts, and the two shafts respectively penetrate the corresponding installation plates, A connecting gear is provided, and a plurality of spiral earth-breaking plates are evenly distributed on the opposite sides of the two toothed discs, and each spiral earth-breaking plate on the same toothed plate is connected by a fixing ring; On the inner side of the mounting plate, the two ends of the power motor are provided with output shafts, and the two output shafts are both slidably clamped with bushings penetrating the two mounting plates, and the two bushings are provided with driving gears. The driving gear and the connecting gear are driven by a chain; through the trenching equipment of the present invention, the spacing between the two toothed discs can be freely adjusted according to the width of the isolation groove, thereby improving the construction accuracy during the excavation of the isolation groove; At the same time, the present invention uses two toothed discs to simultaneously excavate the isolation groove of the polluted soil, which can effectively reduce the disturbance to the organic polluted soil during the operation of the equipment, so as to keep the internal pollutants in the organic polluted soil in a stable state, which is beneficial to the subsequent polluted soil. management and restoration.

Further, in step S2-1, after the heating well is laid out, a polyethylene barrier layer with a width of 50-80 cm is laid on the circumference of the heating wellhead; laying the polyethylene barrier layer can not only reduce the heat loss during the heating process of the contaminated soil, At the same time, it can also avoid secondary pollution caused by the volatilization of organic pollutants.

Further, in step S4, a thermocouple temperature monitor is arranged in the monitoring well to facilitate monitoring of the heating temperature of the organic polluted soil, thereby facilitating adjustment of the heating temperature of the soil and improving the thermal strengthening effect of the organic polluted soil.

Further, the remediation agent also includes 0.5-2 parts of a surfactant, and the surfactant is an anionic surfactant; by adding an anionic surfactant, the consumption of the remediation agent by the pollutants in the organic polluted soil can be reduced, thereby improving the efficiency of the remediation agent. Repair potion utilization efficiency.

Further, after the completion of step S1-3, the soil conditioner is sprayed on the surface of the organic polluted soil area, and the soil conditioner is composed of lumbrokinase stock solution, inoculum solution, natural carborundum ore powder, ribonucleic acid concentrate, potassium dihydrogen phosphate and deodorant. Ionized water is compounded according to the volume ratio of 1:1:3:2:1:4. By adding the above-mentioned soil conditioner to the organic polluted soil, the permeability of the organic polluted soil can be effectively improved, and the remediation agent can be improved. Diffusion efficiency in polluted soil, thereby improving the degradation efficiency of organic pollutants.

Further, in step S3-2, the repairing agent is introduced into the polluted soil in the form of gas-liquid mixture, and the volume percentage of the repairing agent in the gas-liquid mixture is controlled to be 45-60%, and the repairing agent is mixed in the form of gas-liquid mixture. Passing into the organic polluted soil can effectively promote the diffusion of the remediation agent in the organic polluted soil, and has a strong ability to degrade the pollutants aggregated in the organic polluted soil.

Further, in step S2-2, a filter screen layer is wrapped on the drug injection screen, and the mesh aperture of the filter screen layer is smaller than that of the screen hole on the drug injection screen; by setting the filter screen layer, pollution particles can be effectively avoided. Block the injection screen, thereby improving the remediation efficiency of organically polluted soil.

Further, in step S2, the layout density of the injection wells, heating wells and monitoring wells is determined according to the concentration of organic matter in the soil, and the injection wells, heating wells and monitoring wells are arranged at intervals, and the spacing is controlled to be 3-5m; The well layout method can effectively improve the well layout efficiency and reduce the cost of remediation of organically polluted soil.

The use method of the trenching equipment of the present invention is as follows: when in use, connect the power motor to the external power supply, adjust the positions of the two mounting plates on the sliding column according to the excavation width of the isolation groove, and use the limit plate to connect the mounting plate to the sliding column. The operation frame is fixed; the power motor is turned on, and the staff holds the push ring to make the two toothed discs contact the ground; the power motor is used to drive the two drive gears to rotate, so that the two toothed discs rotate, and the screw on the toothed disc is used to break the ground. The board will plan the soil, and then plan the loose soil for cleaning; during the rotation of the toothed plate, adjust the sliding distance of the operation frame on the connecting block, and adjust the depth of the toothed plate; at the same time, use the moving roller to make the equipment box follow the toothed The excavation of the disc is then advanced.

Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has a reasonable design, and uses the thermally enhanced chemical oxidation-reduction coupling method to remediate and treat the compound organic polluted site; The polluted soil can be heated evenly, which is conducive to the removal of volatile organic compounds in the soil; thermally enhanced synergistic chemical oxidation realizes the efficient removal of complex organic pollutants in complex organic pollution sites;

Compared with the ex-situ normal temperature desorption and remediation technology, the invention greatly avoids the secondary pollution problems that may occur due to soil excavation, transfer, transportation and other links. It has the advantages of small amount of engineering, low cost and small disturbance of the site; at the same time, in the process of soil remediation, the hot air migrates in the soil void, increasing the oxygen content in the soil void and groundwater, thereby significantly improving the compound organic pollution site. The proliferation of degrading bacteria in soil can promote the degradation of hydrocarbon organic pollutants in soil.

Description of drawings

Fig. 1 is the longitudinal sectional view of the trenching equipment of the present invention;

Fig. 2 is the left side view of trenching equipment of the present invention;

Fig. 3 is the structural representation of the toothed disc of the present invention;

Among them, 1-equipment box, 10-cavity, 11-moving roller, 2-operating frame, 20-connecting block, 21-pushing ring, 22-installation plate, 220-sliding column, 221-limiting plate, 3- Gear plate, 30-rotating shaft, 300-connecting gear, 31-spiral breaker, 32-fixing ring, 4-power motor, 40-shaft sleeve, 41-drive gear.

Detailed ways

Embodiment 1: In-situ thermally enhanced chemical redox coupling repair method for composite organic pollution sites, comprising the following steps:

S1. Pretreatment of contaminated sites;

S1-1. Determine the pollution treatment boundary of the polluted site and the depth of the contaminated soil, and perform flattening and compaction treatment; then use trenching equipment to excavate an isolation groove with a width of 20cm at the pollution treatment boundary, and arrange isolation walls in the isolation groove ; Among them, the excavation depth of the isolation trench is 30cm greater than the depth of the contaminated soil;

S1-2. Take a 50cm ³ polluted soil sample within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the polluted soil, and calculate the amount of remediation chemicals; wherein, the amount of remediation chemicals added = Volume of contaminated soil×amount of contaminated soil remediation agent per unit volume; wherein, the remediation agent includes the following raw materials by weight: 15 parts of activated iron, 5 parts of plant polysaccharides, 3 parts of polyvinyl alcohol, and 20 parts of deionized water; Iron is activated by reduced iron powder with a particle size of 15-30nm; by adding iron-based remediation agents to the polluted soil, the refractory halogenated hydrocarbons and nitro-type organic compounds in the compound organic polluted soil can be made difficult to oxidize. be effectively removed;

S1-3, adding dilute nitric acid with a volume concentration of 15% to the soil in the pollution treatment boundary determined in step S1-1, adjusting the pH of the polluted soil to 6, and then injecting water into the polluted soil to control the moisture content of the polluted soil to 25wt%;

S2, equipment layout;

S2-1. Arrange multiple injection wells with a spacing of 8m in the contaminated soil area; then arrange heating wells between two adjacent injection wells;

S2-2. Arrange a drug injection screen in the drug injection well, and fill quartz sand between the drug injection screen and the inner wall of the drug injection well; then arrange a heating pipe in the heating well, and a heat dissipation groove is opened on the wall of the heating pipe;

S2-3. Arrange the steam hot air blower and the medicine storage box outside the pollution treatment boundary. The steam hot air blower is connected with the heating pipe through the pipeline, and the medicine storage box is connected with the medicine injection screen. Between the steam hot air blower and the heating pipe, A flow valve is arranged between the medicine storage box and the medicine injection screen;

S2-4. A plurality of monitoring wells are evenly arranged in the contaminated soil area, and the monitoring wells are arranged at intervals with heating wells and injection wells;

S3, repair management;

S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 5kPa, the air volume to be 80m ³ /h, and the air outlet temperature to be 400°C;

S3-2. Use high-pressure injection equipment to intermittently inject the repairing agent into the polluted soil through the injection screen, control the pressure of the high-pressure spraying equipment to be 3kPa, and the injection amount of the repairing agent is calculated according to step S1-2; wherein, the amount of the repairing agent is The access interval is 3h, and the number of access is 2 times;

S4. Monitoring;

Deploy monitoring equipment in the monitoring well, and use the monitoring equipment to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset target, repeat step S3 , until the restoration effect of the organically polluted site reaches the preset target.

Embodiment 2: In-situ thermally enhanced chemical redox coupling repair method for compound organic pollution site, comprising the following steps:

S1. Pretreatment of contaminated sites;

S1-1. Determine the pollution treatment boundary of the polluted site and the depth of the contaminated soil, and perform leveling and compaction treatment; then use trenching equipment to excavate an isolation groove with a width of 35cm at the pollution treatment boundary, and set up an isolation wall in the isolation groove ; Among them, the excavation depth of the isolation groove is greater than the depth of the contaminated soil 40cm; the trenching equipment includes an equipment box 1, an operation frame 2, a toothed disc 3 and a power motor 4; the equipment box 1 is provided with a cavity 10, and the lower end of the equipment box 1 is provided with There is a moving roller 11; a connecting block 20 is movably sleeved on the operating frame 2, and the operating frame 2 is hinged inside the cavity 10 through the connecting block 20. There are two plates 22, the two mounting plates 22 are respectively connected to the lower end of the operation frame 2 through the sliding column 220, and the lower end of the operation frame 2 is connected with a limit plate 221 for fixing the installation plate 22 through bolts; the toothed plate 3 is provided with two, The two toothed discs 3 are both rotated and clamped on the opposite sides of the two mounting plates 22 through the rotating shafts 30. The two rotating shafts 30 respectively penetrate the corresponding mounting plates 22, and are provided with connecting gears 300. The two toothed discs 3 are opposite one another. There are a plurality of spiral earth breaking plates 31 evenly distributed on the side, and each spiral earth breaking plate 31 on the same toothed plate 3 is connected by a fixing ring 32; the power motor 4 is arranged at the bottom end of the operation frame 2, and is located on the inner side of the two mounting plates 22. Both ends of the motor 4 are provided with output shafts, and both output shafts are slidably clamped with shaft sleeves 40 penetrating through the two mounting plates 22 , and driving gears 41 are provided on the two shaft sleeves 40 . The driving gear 41 and the connecting gear 300 are driven by a chain; through the trenching equipment of the present invention, the distance between the two toothed discs 3 can be freely adjusted according to the width of the isolation groove, thereby improving the construction during the excavation of the isolation groove At the same time, the present invention uses two toothed discs 3 to simultaneously excavate the isolation groove of the polluted soil, which can effectively reduce the disturbance to the organic polluted soil during the operation of the equipment, so as to keep the internal pollutants in the organic polluted soil in a stable state. Conducive to the subsequent treatment and restoration of contaminated soil;

S1-2, take 80cm ³ of contaminated soil samples within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the contaminated soil, and calculate the amount of remediation chemicals; wherein, the amount of remediation chemicals put in = The volume of contaminated soil × the amount of contaminated soil remediation agents per unit volume; wherein, the remediation agents include the following raw materials by weight: 20 parts of activated iron, 7 parts of plant polysaccharides, 5 parts of polyvinyl alcohol, and 35 parts of deionized water; Iron is activated by reduced iron powder with a particle size of 25-45nm; by adding iron-based remediation agents to the polluted soil, the refractory halogenated hydrocarbons and nitro-type organic compounds in the compound organic polluted soil can be made difficult to oxidize. be effectively removed;

S1-3, adding dilute nitric acid with a volume concentration of 25% to the soil in the pollution treatment boundary determined in step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the moisture content of the polluted soil to 35wt%;

S2, equipment layout;

S2-1. Arrange multiple injection wells with a spacing of 9m in the contaminated soil area; then arrange heating wells between two adjacent injection wells;

S2-2. Arrange a drug injection screen in the drug injection well, and fill quartz sand between the drug injection screen and the inner wall of the drug injection well; then arrange a heating pipe in the heating well, and a heat dissipation groove is opened on the wall of the heating pipe;

S2-3. Arrange the steam hot air blower and the medicine storage box outside the pollution treatment boundary. The steam hot air blower is connected with the heating pipe through the pipeline, and the medicine storage box is connected with the medicine injection screen. Between the steam hot air blower and the heating pipe, A flow valve is arranged between the medicine storage box and the medicine injection screen;

S2-4. A plurality of monitoring wells are evenly arranged in the contaminated soil area, and the monitoring wells are arranged at intervals with heating wells and injection wells;

S3, repair management;

S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 7kPa, the air volume to be 110m ³ /h, and the air outlet temperature to be 550°C;

S3-2. Use high-pressure injection equipment to intermittently inject the repairing agent into the polluted soil through the injection screen, control the pressure of the high-pressure injection equipment to be 5kPa, and the injection amount of the repairing agent is calculated according to step S1-2; The access interval is 4h, and the number of accesses is 5 times;

S4. Monitoring;

Deploy monitoring equipment in the monitoring well, and use the monitoring equipment to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset target, repeat step S3 , until the restoration effect of the organically polluted site reaches the preset target.

Embodiment 3: In-situ thermally enhanced chemical redox coupling repair method for compound organic pollution site, comprising the following steps:

S1. Pretreatment of contaminated sites;

S1-1. Determine the pollution treatment boundary of the polluted site and the depth of the contaminated soil, and carry out leveling and compaction treatment; then use trenching equipment to excavate an isolation groove with a width of 45cm at the pollution treatment boundary, and set up isolation walls in the isolation groove ; Among them, the excavation depth of the isolation groove is greater than the depth of the contaminated soil by 55cm;

S1-2. Take a 100cm ³ polluted soil sample within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the polluted soil, and calculate the amount of remediation chemicals; wherein, the amount of remediation chemicals added = The volume of contaminated soil × the amount of contaminated soil remediation agents per unit volume; wherein, the remediation agents include the following raw materials by weight: 25 parts of activated iron, 9 parts of plant polysaccharides, 7 parts of polyvinyl alcohol, and 45 parts of deionized water; Iron is activated by biologically reduced iron powder with a particle size of 30-45nm; by adding iron-based remediation agents to the polluted soil, the refractory halogenated hydrocarbons and nitro-type organic compounds and other hydrocarbon derivatives in the compound organic polluted soil can be made difficult to oxidize. be effectively removed;

S1-3, adding dilute nitric acid with a volume concentration of 30% to the soil in the pollution treatment boundary determined in step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the moisture content of the polluted soil to 40wt%;

S2, equipment layout;

S2-1. Arrange multiple injection wells with a spacing of 10m in the contaminated soil area; then arrange heating wells between two adjacent injection wells; after the heating wells are laid out, lay a width of 50cm in the circumferential direction of the heating wells The polyethylene barrier layer; by laying the polyethylene barrier layer, it can not only reduce the heat loss during the heating process of the polluted soil, but also avoid the secondary pollution caused by the volatilization of organic pollutants;

S2-2. Arrange a drug injection screen in the drug injection well, and fill quartz sand between the drug injection screen and the inner wall of the drug injection well; a filter screen layer is wrapped on the drug injection screen, and the mesh aperture of the filter screen layer is smaller than that of the injection well. The aperture of the screen hole on the drug screen is 0.5mm; by setting the filter layer, it can effectively prevent the pollution particles from blocking the drug injection screen, thereby improving the remediation efficiency of the organic polluted soil; A heat sink is provided;

S2-3. Arrange the steam hot air blower and the medicine storage box outside the pollution treatment boundary. The steam hot air blower is connected with the heating pipe through the pipeline, and the medicine storage box is connected with the medicine injection screen. Between the steam hot air blower and the heating pipe, A flow valve is arranged between the medicine storage box and the medicine injection screen;

S2-4. A plurality of monitoring wells are evenly arranged in the contaminated soil area, and the monitoring wells are arranged at intervals with heating wells and injection wells;

S3, repair management;

S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 9kPa, the air volume to be 130m ³ /h, and the air outlet temperature to be 750°C;

S3-2. Use high-pressure injection equipment to intermittently inject the repairing agent into the polluted soil through the injection screen, control the pressure of the high-pressure injection equipment to be 7kPa, and the injection amount of the repairing agent is calculated according to step S1-2; wherein, the amount of the repairing agent is The access interval is 5h, and the number of accesses is 6 times;

S4. Monitoring;

Deploy monitoring equipment in the monitoring well, and use the monitoring equipment to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset target, repeat step S3 , until the restoration effect of the organically polluted site reaches the preset target.

Embodiment 4: In-situ thermally enhanced chemical redox coupling repair method for composite organic pollution site, comprising the following steps:

S1. Pretreatment of contaminated sites;

S1-1. Determine the pollution treatment boundary of the polluted site and the depth of the contaminated soil, and perform flattening and compaction treatment; then use trenching equipment to excavate an isolation groove with a width of 20cm at the pollution treatment boundary, and arrange isolation walls in the isolation groove ; Among them, the excavation depth of the isolation trench is 30cm greater than the depth of the contaminated soil;

S1-2. Take a 50cm ³ polluted soil sample within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the polluted soil, and calculate the amount of remediation chemicals; wherein, the amount of remediation chemicals added = The volume of contaminated soil×amount of contaminated soil remediation agent per unit volume; wherein, the remediation agent includes the following raw materials by weight: 15 parts of activated iron, 5 parts of plant polysaccharides, 3 parts of polyvinyl alcohol, 20 parts of deionized water, surfactant 0.5 part; among them, activated iron is activated by biologically reduced iron powder with a particle size of 15-25nm; by adding iron-based remediation agents to the polluted soil, it can make the halogenated hydrocarbons and nitro compounds that are difficult to oxidize in the composite organic polluted soil. Hydrocarbon derivatives such as organic matter are effectively removed; the surfactant is octanol-9 carboxylate anionic surfactant; by adding anionic surfactants, the consumption of pollutants in organic polluted soil for remediation agents can be reduced, thereby Improve the utilization efficiency of repairing agents;

S1-3, adding dilute nitric acid with a volume concentration of 15% to the soil in the pollution treatment boundary determined in step S1-1, adjusting the pH of the polluted soil to 6, and then injecting water into the polluted soil to control the moisture content of the polluted soil to 25wt%;

S2, equipment layout;

S2-1. Arrange multiple injection wells with a spacing of 8m in the contaminated soil area; then arrange heating wells between two adjacent injection wells;

S2-2. Arrange a drug injection screen in the drug injection well, and fill quartz sand between the drug injection screen and the inner wall of the drug injection well; then arrange a heating pipe in the heating well, and a heat dissipation groove is opened on the wall of the heating pipe;

S2-3. Arrange the steam hot air blower and the medicine storage box outside the pollution treatment boundary. The steam hot air blower is connected with the heating pipe through the pipeline, and the medicine storage box is connected with the medicine injection screen. Between the steam hot air blower and the heating pipe, A flow valve is arranged between the medicine storage box and the medicine injection screen;

S2-4. A plurality of monitoring wells are evenly arranged in the contaminated soil area, and the monitoring wells are arranged at intervals with heating wells and injection wells;

S3, repair management;

S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 5kPa, the air volume to be 80m ³ /h, and the air outlet temperature to be 400°C;

S3-2. Use high-pressure injection equipment to intermittently inject the repairing agent into the polluted soil through the injection screen, control the pressure of the high-pressure spraying equipment to be 3kPa, and the injection amount of the repairing agent is calculated according to step S1-2; wherein, the amount of the repairing agent is The access interval is 3h, and the number of access is 2 times;

S4. Monitoring;

Deploy monitoring equipment and thermocouple temperature monitors in the monitoring well, and use the monitoring equipment to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset value If the target is reached, step S3 is repeated until the restoration effect of the organic contaminated site reaches the preset target; thermocouple temperature monitors are arranged to facilitate the monitoring of the heating temperature of the organically polluted soil, thereby facilitating the adjustment of the heating temperature of the soil and improving the organic pollution. Thermal strengthening effect of soil.

Embodiment 5: In-situ thermally enhanced chemical redox coupling repair method for compound organic pollution site, comprising the following steps:

S1. Pretreatment of contaminated sites;

S1-1. Determine the pollution treatment boundary of the polluted site and the depth of the contaminated soil, and carry out leveling and compaction treatment; then use trenching equipment to excavate an isolation groove with a width of 45cm at the pollution treatment boundary, and set up isolation walls in the isolation groove ; Among them, the excavation depth of the isolation groove is greater than the depth of the contaminated soil by 55cm;

S1-2. Take a 100cm ³ polluted soil sample within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the polluted soil, and calculate the amount of remediation chemicals; wherein, the amount of remediation chemicals added = Volume of polluted soil×amount of contaminated soil remediation agent per unit volume; wherein, the remediation agent includes the following raw materials by weight: 25 parts of activated iron, 9 parts of plant polysaccharides, 7 parts of polyvinyl alcohol, and 45 parts of deionized water; Iron is activated by reduced iron powder with a particle size of 30-45nm; by adding iron-based remediation agents to the polluted soil, it can make the refractory halogenated hydrocarbons and nitro-type organic compounds in the composite organic polluted soil. be effectively removed;

S1-3, adding dilute nitric acid with a volume concentration of 30% to the soil in the pollution treatment boundary determined in step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the moisture content of the polluted soil to 40wt%; Spray the soil conditioner on the surface of the organic contaminated soil area. The soil conditioner is composed of lumbrokinase stock solution, inoculum solution, natural emery ore powder, ribonucleic acid concentrate, potassium dihydrogen phosphate and deionized water in a volume ratio of 1:1:3 :2:1:4 compound, by adding the above-mentioned soil conditioner to the organic polluted soil, the permeability of the organic polluted soil can be effectively improved, the diffusion efficiency of the remediation agent in the polluted soil can be improved, and the organic pollution can be improved. The degradation efficiency of pollutants;

S2, equipment layout;

S2-1. Arrange multiple injection wells with a spacing of 9m in the contaminated soil area; then arrange heating wells between two adjacent injection wells;

S2-2. Arrange a drug injection screen in the drug injection well, and fill quartz sand between the drug injection screen and the inner wall of the drug injection well; then arrange a heating pipe in the heating well, and a heat dissipation groove is opened on the wall of the heating pipe;

S2-3. Arrange the steam hot air blower and the medicine storage box outside the pollution treatment boundary. The steam hot air blower is connected with the heating pipe through the pipeline, and the medicine storage box is connected with the medicine injection screen. Between the steam hot air blower and the heating pipe, A flow valve is arranged between the medicine storage box and the medicine injection screen;

S2-4. A plurality of monitoring wells are evenly arranged in the contaminated soil area, and the monitoring wells are arranged at intervals with heating wells and injection wells;

S3, repair management;

S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 9kPa, the air volume to be 130m ³ /h, and the air outlet temperature to be 680°C;

S3-2. Use high-pressure spray equipment to inject the repairing agent into the polluted soil in the form of gas-liquid mixture intermittently through the injection screen, and control the volume percentage of the repairing agent in the gas-liquid mixture to be 45%. The remediation agent is introduced into the organic contaminated soil in a mixed form, which can effectively promote the diffusion of the remediation agent in the organic contaminated soil, and has a strong degradation ability for the pollutants aggregated in the organic contaminated soil; control the pressure of the high-pressure injection equipment to 7kPa, the remediation The injection amount of the medicament is calculated according to step S1-2; wherein, the injection interval time of the repairing medicament is 5h, and the number of times of injection is 6;

S4. Monitoring;

Deploy monitoring equipment in the monitoring well, and use the monitoring equipment to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset target, repeat step S3 , until the restoration effect of the organically polluted site reaches the preset target.

Embodiment 6: In-situ thermally enhanced chemical redox coupling repair method for composite organic pollution site, comprising the following steps:

S1. Pretreatment of contaminated sites;

S1-1. Determine the pollution treatment boundary of the polluted site and the depth of the contaminated soil, and perform flattening and compaction treatment; then use trenching equipment to excavate an isolation groove with a width of 20cm at the pollution treatment boundary, and arrange isolation walls in the isolation groove ; Among them, the excavation depth of the isolation trench is 30cm greater than the depth of the contaminated soil;

S1-2, take 85cm ³ of contaminated soil samples within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the contaminated soil, and calculate the amount of remediation chemicals; wherein, the amount of remediation chemicals put in = Volume of contaminated soil×amount of contaminated soil remediation agent per unit volume; wherein, the remediation agent includes the following raw materials by weight: 20 parts of activated iron, 7 parts of plant polysaccharides, 6 parts of polyvinyl alcohol, and 33 parts of deionized water; Iron is activated by reduced iron powder with a particle size of 30-45nm; by adding iron-based remediation agents to the polluted soil, it can make the refractory halogenated hydrocarbons and nitro-type organic compounds in the composite organic polluted soil. be effectively removed;

S1-3, adding dilute nitric acid with a volume concentration of 26% to the soil in the pollution treatment boundary determined in step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the moisture content of the polluted soil to 35wt%;

S2, equipment layout;

S2-1. Arrange multiple injection wells with a spacing of 10m in the contaminated soil area; then arrange heating wells between two adjacent injection wells;

S2-2. Arrange a drug injection screen in the drug injection well, and fill quartz sand between the drug injection screen and the inner wall of the drug injection well; then arrange a heating pipe in the heating well, and a heat dissipation groove is opened on the wall of the heating pipe;

S2-3. Arrange the steam hot air blower and the medicine storage box outside the pollution treatment boundary. The steam hot air blower is connected with the heating pipe through the pipeline, and the medicine storage box is connected with the medicine injection screen. Between the steam hot air blower and the heating pipe, A flow valve is arranged between the medicine storage box and the medicine injection screen;

S2-4. A plurality of monitoring wells are evenly arranged in the contaminated soil area, and the monitoring wells are arranged at intervals with heating wells and injection wells; and the distance is controlled to 3m;

S3, repair management;

S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 6kPa, the air volume to be 112m ³ /h, and the air outlet temperature to be 450°C;

S3-2. Use high-pressure injection equipment to intermittently inject the repairing agent into the polluted soil through the injection screen, control the pressure of the high-pressure injection equipment to be 5kPa, and the injection amount of the repairing agent is calculated according to step S1-2; The access interval is 4h, and the number of accesses is 5 times;

S4. Monitoring;

Deploy monitoring equipment in the monitoring well, and use the monitoring equipment to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset target, repeat step S3 , until the restoration effect of the organically polluted site reaches the preset target.

Embodiment 7: In-situ thermally enhanced chemical redox coupling repair method for composite organic pollution site, comprising the following steps:

S1. Pretreatment of contaminated sites;

S1-1. Determine the pollution treatment boundary of the polluted site and the depth of the contaminated soil, and carry out leveling and compaction treatment; then use trenching equipment to excavate an isolation groove with a width of 45cm at the pollution treatment boundary, and set up isolation walls in the isolation groove ; Among them, the excavation depth of the isolation groove is greater than the depth of the contaminated soil 55cm; the trenching equipment includes an equipment box 1, an operation frame 2, a toothed plate 3 and a power motor 4; the equipment box 1 is provided with a cavity 10, and the lower end of the equipment box 1 is provided There is a moving roller 11; a connecting block 20 is movably sleeved on the operating frame 2, and the operating frame 2 is hinged inside the cavity 10 through the connecting block 20. There are two plates 22, the two mounting plates 22 are respectively connected to the lower end of the operation frame 2 through the sliding column 220, and the lower end of the operation frame 2 is connected with a limit plate 221 for fixing the installation plate 22 through bolts; the toothed plate 3 is provided with two, The two toothed discs 3 are both rotated and clamped on opposite sides of the two mounting plates 22 through the rotating shafts 30 . The two rotating shafts 30 respectively penetrate through the corresponding mounting plates 22 and are provided with connecting gears 300 . The two toothed discs 3 are opposite one another. There are a plurality of spiral earth breaking plates 31 evenly distributed on the side, and each spiral earth breaking plate 31 on the same toothed plate 3 is connected by a fixing ring 32; the power motor 4 is arranged at the bottom end of the operation frame 2, and is located on the inner side of the two mounting plates 22, and the power Both ends of the motor 4 are provided with output shafts, and both output shafts are slidably clamped with shaft sleeves 40 penetrating through the two mounting plates 22 , and driving gears 41 are provided on the two shaft sleeves 40 . The driving gear 41 and the connecting gear 300 are driven by a chain; through the trenching equipment of the present invention, the distance between the two toothed discs 3 can be freely adjusted according to the width of the isolation groove, thereby improving the construction of the isolation groove excavation At the same time, the present invention uses the two toothed discs 3 to simultaneously excavate the isolation groove of the polluted soil, which can effectively reduce the disturbance to the organic polluted soil during the operation of the equipment, so as to keep the pollutants in the organic polluted soil in a stable state. Conducive to the subsequent treatment and restoration of contaminated soil;

S1-2. Take a 100cm ³ polluted soil sample within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the polluted soil, and calculate the amount of remediation chemicals; wherein, the amount of remediation chemicals added = The volume of contaminated soil × the amount of contaminated soil remediation agents per unit volume; the remediation agents include the following raw materials by weight: 25 parts of activated iron, 9 parts of plant polysaccharides, 7 parts of polyvinyl alcohol, 45 parts of deionized water, and 2 parts of surfactant ; Among them, activated iron is activated by reduced iron powder with a particle size of 15-25 nm; by adding iron-based remediation agents to the polluted soil, the refractory halogenated hydrocarbons and nitro-type organic compounds in the composite organic polluted soil can be made. Hydrocarbon derivatives are effectively removed; the surfactant is octanol-9 carboxylate anionic surfactant; by adding anionic surfactants, the consumption of pollutants in organic polluted soil for remediation agents can be reduced, thereby improving remediation the utilization efficiency of the drug;

S1-3, adding dilute nitric acid with a volume concentration of 30% to the soil in the pollution treatment boundary determined in step S1-1, adjusting the pH of the polluted soil to 7, and then injecting water into the polluted soil to control the moisture content of the polluted soil to 40wt%; Spray the soil conditioner on the surface of the organic contaminated soil area. The soil conditioner is composed of lumbrokinase stock solution, inoculum solution, natural emery ore powder, ribonucleic acid concentrate, potassium dihydrogen phosphate and deionized water in a volume ratio of 1:1:3 :2:1:4 compound, by adding the above-mentioned soil conditioner to the organic polluted soil, the permeability of the organic polluted soil can be effectively improved, the diffusion efficiency of the remediation agent in the polluted soil can be improved, and the organic pollution can be improved. The degradation efficiency of pollutants;

S2, equipment layout;

S2-1. Arrange multiple injection wells with a spacing of 8m in the contaminated soil area; then arrange heating wells between two adjacent injection wells; after the heating wells are laid, the circumferential width of the heating wellhead is 80cm The polyethylene barrier layer; by laying the polyethylene barrier layer, it can not only reduce the heat loss during the heating process of the polluted soil, but also avoid the secondary pollution caused by the volatilization of organic pollutants;

S2-2. Arrange a drug injection screen in the drug injection well, and fill quartz sand between the drug injection screen and the inner wall of the drug injection well; a filter screen layer is wrapped on the drug injection screen, and the mesh aperture of the filter screen layer is smaller than that of the injection well. The aperture of the screen hole on the drug screen is 0.6mm; by setting the filter layer, it can effectively prevent the pollution particles from clogging the drug screen, thereby improving the remediation efficiency of organic contaminated soil; A heat sink is provided;

S2-3. Arrange the steam hot air blower and the medicine storage box outside the pollution treatment boundary. The steam hot air blower is connected with the heating pipe through the pipeline, and the medicine storage box is connected with the medicine injection screen. Between the steam hot air blower and the heating pipe, A flow valve is arranged between the medicine storage box and the medicine injection screen;

S2-4. Arrange multiple monitoring wells evenly in the polluted soil area. The monitoring wells are arranged at intervals between the heating wells and the injection wells. The layout density is determined by the concentration of organic matter in the soil. The distance between the injection wells, the heating wells and the monitoring wells is controlled as follows: 5m; the above-mentioned well layout method can effectively improve the well layout efficiency, and at the same time can reduce the remediation cost of organic polluted soil;

S3, repair management;

S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 9kPa, the air volume to be 130m ³ /h, and the air outlet temperature to be 750°C;

S3-2. Use high-pressure jetting equipment to intermittently inject the remediation agent into the polluted soil in the form of gas-liquid mixture through the injection screen, control the volume percentage of the remediation agent to account for 60% of the gas-liquid mixture, and control the pressure of the high-pressure jetting equipment to be 7kPa, the injection amount of the repairing agent is calculated according to step S1-2; wherein, the injection interval time of the repairing agent is 5h, and the number of injections is 6 times; the repairing agent is introduced into the organic polluted soil in the form of gas-liquid mixing, which can It can effectively promote the diffusion of remediation agents in the organically polluted soil, and has a strong ability to degrade the aggregated pollutants in the organically polluted soil;

S4. Monitoring;

Deploy monitoring equipment and thermocouple temperature monitors in the monitoring well, and use the monitoring equipment to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset value If the target is reached, step S3 is repeated until the restoration effect of the organically polluted site reaches the preset target; by arranging a thermocouple temperature monitor, it is convenient to monitor the heating temperature of the organically polluted soil, thereby facilitating the adjustment of the heating temperature of the soil and improving the organic pollution. Thermal strengthening effect of contaminated soil.

Test example: Take the raw material stacking site of a chemical plant in southern China as the test site, the site area is 1500m ² , the contaminated site is randomly divided into 24 sample plots, and then the 24 test plots are randomly divided into 8 groups; Seven groups of test plots were repaired by the methods of Examples 1-7 of the present invention, and the eighth group was repaired by the method of the prior art, as a comparative example; after the test, the organic pollutants in each test plot were degraded respectively. The test results are shown in Table 1:

Influence of the method of each embodiment of table 1 on the degradation rate of organic pollutants in the compound organic pollution site;

It can be seen from the data in Table 1 that, compared with Example 1, by adding iron-based remediation agents to the polluted soil, the refractory halogenated hydrocarbons and nitro-type organic compounds and other hydrocarbon derivatives in the composite organic polluted soil can be made difficult to oxidize. can be effectively removed; by using the trenching equipment of the present invention, the distance between the two toothed discs can be freely adjusted according to the width of the isolation groove, thereby improving the construction accuracy during the excavation of the isolation groove; at the same time, the present invention uses two toothed discs. At the same time, the excavation of the isolation groove in the polluted soil can effectively reduce the disturbance to the organic polluted soil during the operation of the equipment, so as to keep the pollutants in the organic polluted soil in a stable state, which is beneficial to the subsequent treatment and restoration of the polluted soil; Example 3 Compared with Example 1, by laying a polyethylene barrier layer around the heating wellhead, it can not only reduce the loss of heat during the heating process of the polluted soil, but also avoid secondary pollution caused by the volatilization of organic pollutants; Wrapping the screen layer can effectively prevent the pollution particles from blocking the injection screen, thereby improving the remediation efficiency of the organic polluted soil; compared with the embodiment 1, the thermocouple temperature monitor is arranged in the monitoring well, which is convenient for the organic polluted soil. Monitoring the heating temperature of the soil, which is beneficial to adjust the heating temperature of the soil, improve the thermal strengthening effect of the organic polluted soil, and effectively promote the degradation efficiency of organic pollutants in the soil; The carboxylate anionic surfactant can reduce the consumption of pollutants in the organic polluted soil for the remediation agent, thereby improving the utilization efficiency of the remediation agent; Example 5 is compared with Example 1, by adding the above ratio to the organic polluted soil. It can effectively improve the permeability of organic polluted soil, and can improve the diffusion efficiency of remediation agents in polluted soil, thereby improving the degradation efficiency of organic pollutants. It promotes the diffusion of remediation agents in the organic polluted soil, and has a strong degradation ability for the pollutants aggregated in the organic polluted soil; compared with Example 1, the well layout method of the present invention can effectively improve the well layout efficiency. , which is beneficial to improve the remediation efficiency of organically polluted sites, and can also reduce the cost of remediation of organically contaminated soils; Example 7 is compared with Examples 1 to 6, by synthesizing and optimizing each parameter condition, the compound organically polluted site is The degradation rate of various organic pollutants reached the highest.

Claims (10)

1. In-situ thermal strengthening chemical redox coupling repair method for composite organic pollution site, is characterized in that, comprises the following steps: S1. Pretreatment of contaminated sites; S1-1. Determine the pollution treatment boundary of the contaminated site and the depth of the contaminated soil, and perform leveling and compaction treatment; An isolation retaining wall is arranged in the groove; wherein, the excavation depth of the isolation groove is 30-55 cm greater than the depth of the contaminated soil; S1-2. Take a 50-100cm ³ polluted soil sample within the pollution treatment boundary determined in step S1-1, measure the type and content of organic pollutants in the polluted soil, and calculate the amount of remediation chemicals; Amount = volume of contaminated soil × amount of contaminated soil remediation agent per unit volume; S1-3. Add dilute nitric acid with a volume concentration of 15-30% to the soil within the pollution treatment boundary determined in step S1-1, adjust the pH of the polluted soil to 6-7, and then inject water into the polluted soil to control the moisture content of the polluted soil 25～40wt%; S2, equipment layout; S2-1. Arrange multiple injection wells with a spacing of 8-10m in the contaminated soil area; then arrange heating wells between two adjacent injection wells; S2-2. Arrange a medicine injection screen into the medicine injection well, and fill quartz sand between the medicine injection screen and the inner wall of the medicine injection well; then arrange a heating pipe in the heating well, and the heating pipe wall is A heat sink is provided; S2-3, arrange a steam hot air blower and a medicine storage box outside the pollution treatment boundary, the steam hot air blower is connected with the heating pipe through a pipeline, and the medicine storage box is connected with the medicine injection screen; Flow valves are arranged between the pipes, between the medicine storage box and the medicine injection screen; S2-4. A plurality of monitoring wells are evenly arranged in the contaminated soil area, and the monitoring wells are arranged at intervals from the heating well and the injection well; S3, repair management; S3-1. Use the steam hot air blower to continuously pass the hot air into the polluted soil through the heating pipe; control the air pressure of the steam hot air blower to be 5-9kPa, the air volume to be 80-130m ³ /h, and the air outlet temperature to be 400-750°C; S3-2. Use high-pressure injection equipment to intermittently inject the repairing agent into the polluted soil through the injection screen, control the pressure of the high-pressure injection equipment to be 3-7 kPa, and the injection amount of the repairing agent is calculated according to step S1-2; The interval time of the medicine is 3 to 5 hours, and the number of times is 2 to 6; S4. Monitoring; Monitoring equipment is arranged in the monitoring well, and the monitoring equipment is used to monitor the restoration effect of the compound organic pollution site in real time; if the restoration effect of the organic pollution site reaches the preset target, the restoration is completed; if the restoration effect of the organic pollution site does not reach the preset target, the restoration is completed. Step S3 is repeated until the restoration effect of the organically polluted site reaches the preset target. 2. The in-situ thermally enhanced chemical redox coupling repair method for a composite organic pollution site according to claim 1, wherein in step S1-1, the trenching equipment comprises an equipment box (1), an operation rack (2) ), a toothed plate (3) and a power motor (4); a cavity (10) is arranged inside the equipment box (1), and a moving roller (11) is arranged at the lower end of the equipment box (1); the operation frame (2) ) is provided with a connecting block (20) on the movable sleeve, the operation frame (2) is hingedly connected inside the cavity (10) through the connecting block (20), and the upper end of the operation frame (2) is provided with a push ring (21) , the lower end is provided with a mounting plate (22), the mounting plate (22) is provided with two, and the two mounting plates (22) are respectively connected to the lower end of the operation frame (2) through the sliding column (220), and the operation frame (2) The lower end is connected with a limit plate (221) for fixing the mounting plate (22) by bolts; the toothed discs (3) are provided with two, and the two toothed discs (3) are respectively rotated and clamped by the rotating shaft (30). On the opposite sides of the two mounting plates (22), the two rotating shafts (30) respectively penetrate the corresponding mounting plates (22), and are provided with connecting gears (300), and the opposite sides of the two toothed discs (3) A plurality of spiral earth breaking plates (31) are evenly distributed, and each spiral earth breaking plate (31) on the same toothed disc (3) is connected by a fixing ring (32); the power motor (4) is arranged at the bottom of the operation frame (2) Both ends of the power motor (4) are provided with output shafts, and the two output shafts are slidably clamped with shafts passing through the two mounting plates (22). A sleeve (40) is provided, both of the shaft sleeves (40) are provided with a drive gear (41), and the drive gear (41) inside the same mounting plate (22) and the connection gear (300) are driven by a chain. 3 . The method for in-situ thermally enhanced chemical redox coupling repairing of a composite organic contaminated site according to claim 1 , wherein in step S2 - 1 , after the heating well is laid out, the circumferential width of the heating wellhead is 50～50 . 80cm of polyethylene barrier. 4 . The in-situ thermally enhanced chemical redox coupling repair method for a composite organic pollution site according to claim 1 , wherein in step S4 , a thermocouple temperature monitor is arranged in the monitoring well. 5 . 5 . The method for in-situ thermally enhanced chemical redox coupling repairing of composite organic polluted sites according to claim 1 , wherein, in step S1-2, the repairing agent comprises the following raw materials in parts by weight: 15-25% activated iron. 6 . parts, 5-9 parts of plant polysaccharides, 3-7 parts of polyvinyl alcohol, and 20-45 parts of deionized water; wherein, the activated iron is activated by reducing iron powder with a particle size of 15-45 nm. 6 . The method for in-situ thermally enhanced chemical redox coupling repairing of composite organic polluted sites according to claim 5 , wherein the repairing agent further comprises 0.5-2 parts of a surfactant, and the surfactant is: 7 . Anionic surfactants. 7 . The method for in-situ thermally enhanced chemical redox coupling repairing of a compound organic contaminated site according to claim 1 , wherein after step S1-3 is completed, a soil conditioner is sprayed on the surface of the organic contaminated soil area, and the soil The improver is made up of lumbrokinase stock solution, inoculum solution, natural emery ore powder, ribonucleic acid concentrate, potassium dihydrogen phosphate and deionized water in a volume ratio of 1:1:3:2:1:4. 8 . The method for in-situ thermally enhanced chemical redox coupled repairing of composite organic polluted sites according to claim 1 , wherein, in step S3-2, the repairing agent is introduced into the polluted soil in the form of gas-liquid mixing. 9 . , the volume percentage of the control repairing agent in the gas-liquid mixture is 45-60%. 9 . The method for in-situ thermally enhanced chemical redox coupling repairing of a compound organic polluted site according to claim 1 , wherein in step S2-2, a filter screen layer is wrapped on the drug injection screen, and the The mesh hole diameter of the filter screen layer is smaller than that of the mesh hole on the medicine injection screen. 10 . The in-situ thermally enhanced chemical redox coupling repair method for a composite organic pollution site according to claim 1 , wherein in step S4 , a temperature sensor is arranged in the monitoring well. 11 .

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