154 results about "Metal contamination" patented technology

The invention relates to the technical field of soil remediation, in particular to a charcoal-fungus symbiont for a freeze-thaw environment and a preparation method and application of the charcoal-fungus symbiont. The preparation method of the charcoal-fungus symbiont comprises the following steps: crushing a biomass raw material, and carrying out pyrolysis to prepare basic charcoal; placing the basic biochar in an iron oxide solution, and carrying out an iron oxide loading reaction to obtain iron oxide biochar; the preparation method comprises the following steps: dipping iron oxide biochar in a chitosan solution for coating modification, then continuously adding a cross-linking agent for cross-linking solidification, and freeze-drying to obtain chitosan-iron oxide composite modified biochar; and immersing the chitosan-iron oxide composite modified biochar into a bacterial suspension of functional microorganisms, oscillating and adsorbing, and freeze-drying to obtain the carbon-bacteria symbiont. The invention aims to improve the heavy metal pollution phenomenon of soil and the soybean root rot disaster in the freezing and thawing cycle environment at the same time.

The invention relates to the technical field of heavy metal contaminated soil remediation, in particular to a plant-microorganism-passivator synergistic remediation method for a heavy metal contaminated farmland, which comprises the following steps: step 1, constructing a soil digital twinborn model; step 2, intelligent decision making and verification of a collaborative restoration scheme; 3, soil pretreatment before remediation; step 4, hierarchical collaborative restoration and dynamic regulation and control; 5, performing long-term verification on the repair effect and performing model iteration; physical heat treatment is used as strengthening pretreatment, the occurrence form of heavy metal is changed through high temperature, biomass charcoal is generated in situ, passivation immobilization-microbial strengthening-plant extraction three-stage collaborative operation is carried out according to the time sequence, pollutants are rapidly locked through a passivating agent, rhizosphere immobilization is strengthened through functional microorganisms, plant growth is promoted, and the quality of plants is improved. And the hyperaccumulator finally removes the heavy metals from the soil, so that the unification of short-term control and long-term reduction is realized.

The application discloses a new device for pre-acidification process combined with cathode buffer zone electric dynamic remediation of heavy metal contaminated soil and a construction method, and belongs to the field of electric dynamic remediation of heavy metal contaminated soil. The device comprises a soil remediation chamber and a sewage treatment chamber. The soil remediation chamber is open at the top, is provided with an anode plate on one side, and is provided with a cathode plate on the opposite side. Filter paper is attached to the two sides of the anode plate and the cathode plate. The cathode plate is further provided with a cathode buffer chamber opposite the anode plate. The anode plate and the cathode plate are connected through wires, a power supply and a sensor. The soil remediation chamber is connected with the sewage treatment chamber on the side provided with the cathode plate, and a gap is formed between the soil remediation chamber and the sewage treatment chamber to allow liquid to flow from the soil remediation chamber into the sewage treatment chamber. The sewage treatment chamber is provided with adsorption material. The sewage treatment chamber is provided with a drainage hole and a drainage pipe at the bottom end. The method can effectively remove heavy metals in sewage and can avoid the possibility of secondary pollution of the environment caused by electric dynamic remediation of sewage.

The invention discloses a submicron sphere soil remediation material as well as a preparation method and application thereof. The remediation material takes modified silicon dioxide as an inner core, nano zero-valent iron as a middle layer and aluminum oxide as an outer layer; the mass ratio of the inner core to the middle layer to the outer layer is (30-50): (20-40): (10-50). The remediation material synthesized through the method has the advantages of being good in soil compatibility, high in cyclic utilization rate, high in heavy metal removal efficiency and the like, and the target of low-energy-consumption remediation of the heavy metal contaminated soil can be achieved.

The utility model relates to a heavy metal contaminated soil remediation agent spraying device, which comprises a frame, a front wheel and a rear wheel are respectively arranged on the frame, and the heavy metal contaminated soil remediation agent spraying device is characterized in that a soil turning device and a spraying device are respectively arranged on the frame; wherein the soil turning device comprises a mounting frame rotationally arranged on the lower side of the frame and a driving component for driving the mounting frame to swing and turn over, and a plurality of plowshares are arranged on the mounting frame at intervals in the direction from the front wheels to the rear wheels. The plowshares located on the mounting frame swing along with the mounting frame to form soil turning depths of different horizontal depths relative to the frame, so that the soil turning depths of the plowshares are controlled, the plowshares are arranged in a step-shaped progressive increase mode, layered soil turning is achieved, soil resistance is reduced, a repairing agent is sprayed to the turned soil in cooperation with the spraying device, and the soil turning efficiency is improved. Therefore, the remediation agent can be quickly and uniformly dispersed to remedy the soil.

The application provides a heavy metal contaminated paddy field agricultural product quality safety evaluation method and application, and belongs to the field of agricultural product quality safety evaluation. The evaluation method comprises the following steps: (1) taking field soil physical and chemical indexes and heavy metal data as a bottom base for model training and verification, screening factors for evaluating agricultural product quality safety, and clarifying the causal relationship between each factor and agricultural product quality safety; (2) constructing an agricultural product quality safety evaluation model for evaluating agricultural product quality safety. The two-stage cascade model combining nonlinearity and linearity and the multi-dimensional driving mechanism analysis based on SHAP provide a reliable bottom algorithm support and theoretical research basis for quantitatively evaluating the occurrence state and transformation and cross-medium transfer rule of Cd / As composite pollution in the Xiangjiang River Basin.

This invention belongs to the field of semiconductor material manufacturing technology, specifically relating to a black silicon nanoforest structure, its preparation method, and its applications. The invention involves depositing a silicon-rich silicon nitride thin film via PECVD, followed by chemical etching using gaseous HF (VHF) to form a uniform silicon forest structure. This method eliminates the need for metal catalysts and masks, removing metal contamination and physical damage. The process is simple and controllable, making it suitable for the industrial production of large-area black silicon.

The utility model discloses a device for electrokinetic remediation of heavy metal contaminated soil, which comprises an electrolysis chamber and a power supply, and an anode chamber and a cathode chamber are respectively arranged on two opposite sides in the electrolysis chamber; an anode plate is arranged in the anode chamber, a cathode plate is arranged in the cathode chamber, and the anode plate and the cathode plate are respectively connected with a power supply; an anion permeable membrane is vertically arranged on the side, close to the cathode chamber, in the electrolysis chamber, and the anode chamber and the cathode chamber are located on the two opposite sides of the anion permeable membrane respectively. According to the device for electrokinetic remediation of the heavy metal contaminated soil, metal precipitates are gathered on one side of the anion permeable membrane and located outside the cathode chamber, a dosing pipe of the cathode chamber cannot be affected, pipe loss is reduced, and electrokinetic remediation efficiency is improved.

The invention discloses a device and method capable of dynamically monitoring heavy metal polluted water and soil repaired through an EICP technology, the device comprises a support, three monitoring systems and a grouting system, the first monitoring system comprises a measuring box, a top cover, a motor, a grouting hole, a transmission shaft, a gear, an inner gear ring, a stirring sampling pipe, a supporting rod, a sheet type multifunctional sensor and a sampling opening; the second monitoring system comprises a liquid conveying hose, a flow control valve, a peristaltic pump, a pump pipe, a measuring box, a raw material box, a waste liquid box, a conductivity meter and a magnetic stirrer; the third monitoring system comprises a support frame, a transfusion hose, a flow control valve, a peristaltic pump, a pump pipe, a centrifugal filter, a measuring box, a raw material box, a waste liquid box and an atomic absorption spectrophotometer; the grouting system comprises a urease solution barrel, a urea solution barrel, a three-way pipe and a suction pump. Biological, chemical and physical indexes in the repairing process can be monitored in real time, and the repairing process can be known.

The application discloses a heavy metal contaminated soil remediation digging treatment device, which comprises a movable base, a liquid medicine tank is installed on the movable base; an adjusting part is installed on the movable base; a conveying part is arranged on one side of the adjusting part, and the conveying part is angle-adjusted through the adjusting part; a treatment part is arranged in the conveying part, and a shunt part capable of treating soil is arranged in the treatment part; a driving part capable of driving the conveying part to rotate is installed on the adjusting part. In the application, the device can be moved to a suitable position by the staff, and the soil can be scooped into the device, and the soil can be crushed under the treatment of the parts in the device, and the crushed soil can be fully sprayed by the treatment solution, so that the treatment solution can fully contact the soil, thereby improving the efficiency of the planting personnel in treating the soil, and the operation of the planting personnel is facilitated, and the efficiency of the planting personnel in treating the soil is indirectly improved.

The utility model relates to soil remediation equipment technical field, specifically disclose a kind of heavy metal contaminated soil remediation device, the utility model includes: box;Slagging port is opened on the box;Setting is used for the crushing mechanism of soil crushing in the box;Inclined fixed mounting in the box is screened to the soil after crushing and is screened plate.This utility model a kind of heavy metal contaminated soil remediation device, when soil is repaired, by pusher assembly setting, on the one hand, the filter hole on the surface of screening plate can be brushed, reduce the blockage of filter hole;On the other hand, by pusher plate, push and sweep accumulated waste is automatically discharged outward through slagging port, so as to prevent the waste after screening from accumulating on the screening plate, affect the soil after crushing discharging, in addition, in the falling of broken soil, under the action of second guide plate, soil can be dispersed, and under the spray of water mist spray pipe, reagent can be more evenly sprayed on the surface of falling soil.

The utility model discloses a heavy metal contaminated soil remediation agent feeding device which comprises a feeding vehicle and a feeding mechanism. A wetting mechanism is arranged at the upper end of the putting vehicle and comprises water tanks, a connecting pipeline and a spraying pipeline, the water tanks are arranged on the front side and the rear side of the upper end of the putting vehicle, the spraying pipeline is fixedly connected to the lower end of the putting vehicle and is a mouth-shaped pipeline, and the lower ends of the water tanks are communicated with the spraying pipeline through the connecting pipeline; the feeding mechanism comprises a storage hopper, a telescopic sleeve, a feeding hopper and a shaking assembly, the storage hopper is fixedly connected to the middle of the upper end of the feeding vehicle, the lower end of the storage hopper is fixedly sleeved with the telescopic sleeve, and the feeding hopper is fixedly connected to the interior of the lower end of the telescopic sleeve. More uniform feeding is achieved in a shaking discharging mode, meanwhile, the agent is directly wetted after being fed, and the situation that the treatment time is delayed due to the too high wind speed is avoided.

The invention discloses a processing method for obtaining a fused quartz optical element with low surface metal impurity content, which sequentially comprises the steps of blank cutting, milling and grinding forming, laser pretreatment, fine grinding, rough polishing, acid pickling, two times of fine polishing and ion beam fine trimming. A silicon dioxide polishing solution is adopted for carrying out metal-pollution-free polishing, ultrasonic-assisted pickling is used for deeply removing metal impurities, and through the synergistic effect of zero-pressure fine polishing and non-contact ion beam fine trimming, the surface damage layer is finally removed, the surface shape precision is controlled, meanwhile, the content of the surface metal impurities is reduced to the ppb level, and the surface quality is improved. Particularly, the cerium element content is reduced by more than 90%, and an ultra-smooth surface with root-mean-square roughness superior to 0.5 nm is obtained. The method solves the technical problem that low surface roughness and low metal impurity content are difficult to consider in the traditional process, and is suitable for batch and stable manufacturing of high-end optical elements.

The invention belongs to the technical field of pollution treatment, and particularly discloses a method for evaluating the long-term stability of repaired heavy metal polluted soil. The method comprises the following steps: crushing and sieving the treated heavy metal polluted soil to obtain a sample, and then mixing the sample with different acid rain accelerating solutions; continuously oscillating the mixture for a preset time length to obtain a mixed solution of a single acceleration test; circularly executing an acceleration test on the mixed solution, and determining the concentration Ci and the chemical form distribution characteristics of the heavy metal element after each time of completion; based on the environmental background values Bi and Ci, calculating a heavy metal polluted soil stability index Ei = Ci / Bi, and constructing a long-term stability index model EN; setting a long-term stability grading standard, and evaluating the long-term stability grade of the repaired heavy metal polluted soil according to the Ei and the EN by comparing the standard. According to the method, the durability of the remediation effect can be accurately quantified, and the problem of risk quantification of reactivation of the heavy metal contaminated soil is effectively solved.

The invention discloses soil leaching equipment for heavy metal contaminated soil remediation, and relates to the technical field of soil remediation. The device comprises a multi-support, the inner wall of the multi-support is fixedly connected with a barrel, the inner wall of the multi-support is fixedly connected with a motor, an output shaft of the motor is fixedly connected with a rotating rod, the top of the barrel is provided with a spraying part used for leaching soil, and the outer wall of the rotating rod is fixedly connected with a plurality of stirring rods. And a feeding hole is formed in the top of the cylinder body. Through cooperation of a disc, a net cylinder, a partition plate, a fixing ring block, an L-shaped fixing rod and a guide arc plate, stones in crushed soil can be blocked outside by the net cylinder, so that the stones are difficult to fall onto the guide arc plate through the net cylinder, separation of the stones and the crushed soil is realized, and the situation that contact between pollutants in the soil and a remediation agent is affected by existence of the stones is avoided; the efficiency of the leaching process is reduced, and the heavy metal cannot be effectively eluted.

A metal contamination collecting system and collecting method. The collecting system comprises a vapor phase corrosion chamber (10), and a first channel, a second channel, a third channel, and a fourth channel which are communicated with the vapor phase corrosion chamber (10), the first channel, the second channel, the third channel, and the fourth channel being independent of each other, and being respectively used for introducing, into the vapor phase corrosion chamber (10), a strong acid gas, an oxidizing gas, an inert gas, and a surface modification gas that enables the surface of a hydrophilic wafer to be hydrophobized. In the collecting process, the surface modification gas is introduced into the vapor phase corrosion chamber (10) so that the surface of the hydrophilic wafer is hydrophobized, thereby during metal contamination collecting, preventing a scanning liquid from dispersing and adhering to the surface of the wafer, and ensuring that the collecting system efficiently collects metal contamination.

The present application belongs to the technical field of environmental remediation and soil ecological engineering, and particularly relates to a modified iron biochar-humus-sulfate-reducing bacteria (SRB) composite system for realizing efficient immobilization and ecological remediation of cadmium (Cd 2+ ) in heavy metal contaminated soil. The system can enhance the stability of microbial colonies and has the characteristics of physical and biological synergistic passivation, thereby realizing long-term stabilization and ecological remediation of heavy metals.

The utility model discloses a kind of heavy metal contaminated soil remediation machines, relate to soil remediation technical field.This kind of heavy metal contaminated soil remediation machine, it include: installation cylinder, the bottom of the installation cylinder is equipped with opening, opening outer side is fixedly installed with discharge box;Filtering mechanism, in the inside of installation cylinder, filtering mechanism includes water jet pipe, support rod and fixed plate, the outside of installation cylinder is equipped with hole, hole is rotatably installed with water jet pipe, the outer side of water jet pipe is fixedly installed with three groups of support rod, the outer side of support rod is fixedly installed with fixed plate, fixed plate rotatably installs in the inside of installation cylinder, the outside of fixed plate is attached with the inside of installation cylinder, fixed plate is set in the inside of opening.After leaching is completed, the start of first motor is controlled, drives water jet pipe forward rotation drives support rod, fixed plate and filter plate rotation, fixed plate no longer closes opening at this time, filter plate rotates to vertical and separates soil and wastewater.

The invention provides a preparation method of a heavy metal polluted farmland soil remediation agent and a soil remediation method, and relates to the technical field of soil remediation, the soil remediation method comprises the following steps: before soil thawing in spring, freezing and thawing a soil layer from the surface of a heavy metal polluted farmland to the underground by 50cm for 5-20 times; 1-2 weeks before crops are sown, the chitosan-magnetic composite biochar is uniformly spread on the soil surface of the heavy metal polluted farmland, and permeable irrigation is carried out; when crops are sown, the soil remediation agent is evenly applied to a soil layer in the area from the surface of the heavy metal polluted farmland to the underground depth of 15 cm, the chitosan-magnetic composite charcoal is evenly applied to a soil layer in the area from the underground depth of 16 cm to the underground depth of 20 cm in the heavy metal polluted farmland, and conventional field water and fertilizer management is conducted after soil covering. By means of the method, efficient and stable remediation of the heavy metal polluted farmland deep soil in the freezing and thawing cycle environment can be achieved.

The invention discloses an electroplating disqualified cadmium layer stripping solution, a preparation method and a use method, and the electroplating disqualified cadmium layer stripping solution comprises 6-8 parts of sodium phytate, 1-3 parts of sodium nitrilotriacetate, 2-4 parts of borate, 5-10 parts of sodium bromate, 1-2 parts of sodium alkyl naphthalene sulfonate, 1-2 parts of glucoside, 5-8 parts of sodium nitrate, 3-5 parts of ammonia water, 2-4 parts of triol ethylamine, 4-6 parts of 1-hydroxyethylidene-1, 1-diphosphonic acid and 8-12 parts of ammonium persulfate. The total amount of the purified water is 100 parts, and the total amount of the purified water is 100 parts. The pH value of the deplating agent solution is alkaline, the problem of hydrogen evolution of a hydrogen sensitive material is solved, the risk of hydrogen embrittlement is avoided, and hydrogen removal is not needed after steel and iron materials are deplated; cadmium ion heavy metal pollution and sewage treatment difficulty exist, the stripped cadmium ions automatically generate precipitates, recycling is facilitated, and the sewage treatment difficulty is reduced; the metal deplating liquid is convenient to use and simple to operate, only unqualified products need to be put into the deplating liquid in a room-temperature environment, after a certain time, after a plating layer is completely removed, the unqualified products are washed with water, and a metal base material is not damaged.

A hybrid bonding apparatus that is able to reduce metal contamination is provided. The hybrid bonding apparatus may include a plasma treater configured to perform a pulsed plasma surface treatment on a first wafer, wherein the first wafer includes a bonding pad; a pulse controller connected to the plasma treater and configured to control on / off of a pulse of the pulsed plasma surface treatment; a cleaner configured to clean the first wafer; a bonder configured to bond the first wafer and a second wafer to each other; and an equipment front end module (EFEM) configured to load the first wafer and the second wafer, and unload the first wafer and the second wafer, after being bonded together.

The embodiment of the utility model provides gas-phase corrosion equipment and a gas-phase decomposition metal contamination collection system.The gas-phase corrosion equipment comprises a gas-phase corrosion cavity, a wafer carrying table, a gas inlet assembly and a driving assembly, the wafer carrying table is located in the gas-phase corrosion cavity, the gas inlet assembly comprises a gas uniformizing disc, and when the gas-phase corrosion equipment is used, the driving assembly drives the wafer carrying table to rotate in the axial direction of the gas uniformizing disc; the lower surface of the gas uniformizing disc is right opposite to the upper surface of the wafer, and the driving assembly is in transmission connection with the gas inlet assembly and can drive the gas uniformizing disc to rotate in the axial direction. Along with the axial rotation of the gas uniformizing disc, the gas channels on the gas uniformizing disc gradually face different areas of the upper surface of the wafer, so that when most of the areas or all the areas of the upper surface of the wafer directly face the gas channels, the gas channels are separated from the gas channels. Therefore, the quantities of the process gases contacted with most of the areas or all the areas of the upper surface of the wafer are the same or are not greatly different, so that the corrosion uniformity can be improved.

The pantoea agglomerans SE16 is classified and named as pantoea agglomerans, and is preserved in the China General Microbiological Culture Collection Center on October 17, 2024, the address is Institute of Microbiology, Chinese Academy of Sciences, No.3, Beichen West Road, Chaoyang District, Beijing, and the preservation number is CGMCC No. 32246. The bacterial strain is applied to strengthening phytoremediation of heavy metal pollution, improving soil nutrients, promoting plant growth and strengthening phytoremediation of pollutants. The strain has the functions of dissolving phosphorus, fixing nitrogen, producing iron carriers, producing indoleacetic acid, ACC deaminase and cellulase, resisting acid, resisting salt and the like, and also can tolerate various heavy metals, polycyclic aromatic hydrocarbons and combined pollution of the heavy metals and the polycyclic aromatic hydrocarbons; by promoting the growth of the sudangrass, improving the photosynthesis of the sudangrass, relieving the oxidation pressure of the sudangrass and changing the composition of soil microbial communities, the toxicity of chromium to the sudangrass is relieved, and the method has practical popularization and application values.

The invention belongs to the technical field of semiconductor manufacturing, and particularly relates to a semiconductor structure and a manufacturing method thereof. The problems that in an existing metal-containing hard mask technology, the metal contamination content of a wafer film layer is high, and an existing metal contamination removing method is low in efficiency, poor in uniformity, difficult to efficiently integrate with an existing semiconductor manufacturing process and the like are solved. The semiconductor structure is processed through a metal-containing hard mask patterning process, and the content of any metal element from the metal-containing hard mask on all exposed surfaces of the semiconductor structure is lower than 1 * 10 < 6 > atoms / cm < 2 >. And an efficient and full-flow control scheme for metal contamination introduced by the metal-containing hard mask is provided.

This invention discloses a method for enhancing the adsorption performance of TpPa-1 with bacterial cellulose and its application. This invention achieves the transformation of powdered TpPa-1 into a macroscopic structural material through the composite of TpPa-1 and bacterial cellulose, while simultaneously improving the uranium adsorption performance of TpPa-1. This solves the problem of difficulty in recovering TpPa-1 powder and meeting the industrial application requirements for recycling. The process of this invention is simple, and the resulting TpPa-1 / BC / PVA composite material can be recycled, achieving increased uranium adsorption capacity while reducing the production cost of TpPa-1 composite materials. It can be used in environmental protection fields such as seawater uranium extraction and treatment of heavy metal pollution in water.

The invention discloses a Fe-Co-C catalyst and a preparation method and application thereof, and belongs to the technical field of sewage degradation. The preparation method comprises the following steps: dissolving Fe (NO3) 3.9 H2O and Co (NO3) 2.6 H2O in water, mixing and stirring, then adding citric acid, continuously stirring, and after the reaction is finished, drying the mixed solution to obtain a precursor; and calcining the precursor in a tubular furnace, cooling to room temperature, taking out, and grinding to obtain the Fe-Co-C catalyst. The prepared catalyst has an obvious core-shell structure, the shell layer is the carbon material, the core layer is Fe-Co metal, the limitation of a single material can be broken through, the shell layer can provide stability for the core layer, metal sites are not prone to loss, secondary metal pollution to the environment is avoided, the catalytic activity is high, and the catalyst is suitable for industrial production. And the method has universality on the degradation capability of organic pollutants.

The present invention provides a clamping jig for pipe connection that can reduce metal contamination. The clamping jig 10 is to connect opposed pipes 70, 70 and includes a first clamping portion 21 fittable into a collar portion 73 of one pipe in the axial direction from the outside and a second clamping portion 31 fittable into the collar portion of the other pipe in the axial direction from the outside, wherein the clamping jig is configured to bring the first clamping portion and the second clamping portion close to each other. The clamping jig is an assembly of members 20, 30, 40, and 50 made of metal materials, and at least a portion of the members is coated with a resin.

The purification of monoalkyl tin trialkoxides and monoalkyl tin triamides are described using fractional distillation and / or ultrafiltration. The purified compositions are useful as radiation sensitive patterning compositions or precursors thereof. The fractional distillation process has been found to be effective for the removal of metal impurities down to very low levels. The ultrafiltration processes have been found to be effective at removal of fine particulates. Commercially practical processing techniques are described.

Organometallic radiation resist compositions are described based on tin ions with alkyl ligands. Some of the compositions have branched alkyl ligands to provide for improved patterning contrast while maintaining a high degree of solution stability. Blends of compounds with distinct alkyl ligands can provide further improvement in the patterning. High resolution patterning with a half-pitch of no more than 25 nm can be achieved with a line width roughness of no more than about 4.5 nm. Synthesis techniques have been developed that allow for the formation of alkyl tin oxide hydroxide compositions with very low metal contamination.

The invention belongs to the technical field of soil remediation, and particularly discloses heavy metal contaminated soil remediation treatment equipment and a method thereof.The remediation treatment equipment comprises a microbial agent preparation unit and an in-situ injection unit, the in-situ injection unit is provided with an embedded base body, a drainage branch pipe, a guide rail frame and a covering pad, and the embedded base body is provided with a temporary storage cavity; the guide rail frame forms a warm-keeping area through coaxial inner and outer ring guide rails, and the moving rod is arranged between the guide rails in a sliding mode and connected with the covering pad. The microbial inoculum is uniformly injected into the soil through the drainage branch pipes, meanwhile, the coverage rate of the covering pad is adjusted by sliding the moving rod, the soil temperature of a microbial inoculum acting area is accurately regulated and controlled, a suitable growth environment is created for functional microorganisms, the microbial activity and the soil remediation efficiency are improved, the equipment structure is reasonable, operation is convenient, the coverage rate is flexible to adjust, and the application range is wide. And the method is suitable for different soil temperature environments, green, environment-friendly, free of secondary pollution and good in remediation effect.