242 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 present application relates to the technical field of the treatment of heavy metal pollution, and in particular, to a method for predicting heavy metal accumulation in soil based on an emission inventory and a receptor model. Atmospheric dust fall, irrigation water, a fertilizer, and a pesticide are used as heavy metal input flux sources of farmland soil, and surface runoff and a crop are used as output fluxes. A heavy metal pollutant input-output flux inventory is established to specify a dynamic equilibrium relationship of heavy metal accumulation in soil, and soil samples are collected and monitored continuously, which provides important help for determining a migration equilibrium of heavy metals in a farmland region affected by a nonferrous metal dressing and smelting slag yard and a source of soil heavy metal pollution, thereby providing theoretical guidance for subsequent prevention and accurate control of heavy metals in soil.

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 provides bacillus velezensis as well as a liquid microbial agent, a solid microbial agent and application thereof, and belongs to the technical field of microbial agents. The bacillus velezensis is bacillus velezensis TP-06-01, and the preservation number of the bacillus velezensis is CCTCC (China Center For Type Culture Collection) NO: M2025693. The liquid fungicide or the solid fungicide obtained by utilizing the bacillus velezensis can promote plants to resist the harm of heavy metals and / or salinization, and can also improve the nutrient elements and / or nutritional ingredients of the plants. In addition, under the heavy metal pollution condition or the salinization condition, the liquid fungicide or the solid fungicide can promote plant growth.

The invention discloses a step-by-step preparation method and application of multi-metal modified biochar. According to the method, through an innovative four-stage step-by-step loading process, four metal salt solutions of FeCl3, MnCl2, CaCl2 and MgCl2 are sequentially used for carrying out modification treatment on the biochar, and the Fe-Mn-Ca-Mg quaternary composite modified biochar is successfully prepared. The method is mainly technically characterized by comprising the following steps: (1) pretreating rice straws by adopting a three-stage countercurrent cleaning and gradient drying process; (2) performing programmed temperature control pyrolysis under the protection of nitrogen to prepare basic biochar; and (3) the sequential loading of the four metal ions is realized by accurately controlling reaction conditions. Experimental results show that the adsorption capacity of the prepared quaternary composite modified biochar on As in a water body is increased by 2 times compared with that of original biochar, the removal rates of Cd, Cu and Pb in the water body all exceed 90%, and the removal rates of Ni and Hg in the water body are increased by 10-15%. The material shows excellent synergistic adsorption performance in a multi-metal coexistence system, and an efficient solution is provided for complex heavy metal pollution abatement.

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 invention provides a soil conditioner for heavy metal contaminated soil and a preparation process of the soil conditioner, and belongs to the technical field of soil remediation. The preparation process comprises the following steps: preparing Fe3O4 (at) ZnO; preparation of sulfonated humic acid-chitosan coated Fe3O4 (at) ZnO; preparing matured compost; and preparing the soil conditioner. The sulfonated humic acid-chitosan coated Fe3O4 (at) ZnO, the matured compost and the oyster shells are mixed with one another, so that the air permeability and the water permeability of the soil can be improved, the water and fertilizer retention capacity of the soil can be enhanced, heavy metals can be adsorbed and fixed by the sulfonated humic acid-chitosan coated Fe3O4 (at) ZnO, the bioavailability of the heavy metals can be reduced, and the soil fertility can be improved. The risk of migrating into the plant body is reduced, the quality safety of agricultural products is guaranteed, and meanwhile, the remediation and improvement of the soil environment are also facilitated.

The application provides a method for controlling MRAM magnetic tunnel wall contamination, which does not need to additionally plate an insulating protective layer on the MTJ layer wall, but forms a unique funnel-shaped groove in the etching process, the funnel-shaped groove comprises a first region away from the plane of the substrate and a second region adjacent to the plane of the substrate, the size of the first region gradually increases in the first direction, and the size of the second region is constant in the first direction; when removing the metal contamination at the bottom of the funnel-shaped groove, the funnel-shaped groove can prevent the metal contamination from adhering to the wall of the MTJ layer, thereby improving the device performance of the MRAM.

The invention relates to the technical field of engineering materials, and discloses a slag geopolymer heavy metal adsorption material and a preparation method thereof. A geopolymer is innovatively modified by introducing a magnetic-sensitive nano material, and the heavy metal adsorption performance of the geopolymer is remarkably improved through an in-situ hydrothermal conversion process. The high-calcium slag geopolymer heavy metal adsorption material disclosed by the invention shows remarkable heavy metal adsorption performance and can realize the purpose of rapid solid-liquid separation of the adsorption material under the action of an external magnetic field, so that an innovative solution is provided for efficient and convenient heavy metal pollution treatment; the problems that a conventional low-calcium geopolymer is low in heavy metal adsorption amount, large in residue amount and difficult to dehydrate are solved, the method has wide application prospects, a new method for treating waste with waste is provided for synergistically solving heavy metal waste liquid treatment and solid waste disposal, and important environment-friendly, social and economic benefits are achieved.

The invention relates to the technical field of heavy metal contaminated soil remediation, and provides heavy metal contaminated muck mixture dry method magnetic attraction remediation equipment which comprises a vibration screening device, a grading conveying device and a magnetic attraction device. A discharging area of the multi-stage screening area is located above the grading conveying device, the magnetic attraction device comprises a magnetic attraction unit and an annular sorting belt, the magnetic attraction unit is arranged on the inner side of the annular sorting belt, and a part of the annular sorting belt and the magnetic attraction unit are located above one end of an outlet of the grading conveying device. And the other part of the annular sorting belt is positioned on the outer side of one end of the outlet of the grading conveying device. By means of the technical scheme, the problems that in the prior art, a heavy metal muck mixture contaminated soil chemical agent remediation method cannot be applied, and corresponding equipment for efficiently remediating the contaminated soil is lacked are solved.

The invention discloses a heavy metal pollution bottom mud treatment wastewater recovery device, and relates to the technical field of sludge wastewater treatment equipment, the heavy metal pollution bottom mud treatment wastewater recovery device comprises a filter unit, the filter unit comprises a plurality of filter pipe groups, a rotating shaft and two connecting assemblies, the two ends of each filter pipe are provided with adsorption rings through guide rods, and the plurality of filter pipe groups are connected to the peripheral side of the rotating shaft; the connecting assemblies are located at the two ends of the filter pipe set, a plurality of communicating channels are formed in the connecting assemblies, an adsorption part is arranged on a channel opening of each communicating channel, the two ends of the rotating shaft are connected to the two main bodies respectively, and the rotating shaft rotates to enable the polluted filter pipes to move to the position of the backwashing channel and enable the clean filter pipes to move to the position of the wastewater filter channel. When the filter pipe is switched to be polluted, the backwashing communication pipeline flushes the switched polluted filter pipe for standby application, and wastewater is re-introduced into the wastewater filter channel and the switched clean filter pipe, so that the device recovers normal operation, and the problem that the recovery device is difficult to operate normally due to backwashing of the filter pipe is avoided to a great extent.

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 present invention discloses a strain of Streptomyces koyangensis, a microbial agent, its application, and a preparation method. This strain has excellent control effects against anthrax and rice blast, providing a new solution for the prevention and control of these diseases. Furthermore, this Streptomyces koyangensis is salt-alkali and heavy metal-tolerant, making it a potential strain for controlling plant diseases in saline-alkali land and heavy metal-contaminated soil environments. It has promising market application prospects for its application in cultivation in saline-alkali land, secondary salinization, and heavy metal-contaminated soil.

This invention belongs to the field of environmental microbiology technology, specifically disclosing a *Aspergillus niger* strain with lead adsorption capacity and its applications. This invention involved the isolation of microorganisms from 33 samples of water and sediment from the Henan section of the Yellow River basin. A fungal strain with high lead tolerance and adsorption was screened out, and after morphological and ITS molecular identification, it was named *Aspergillus niger* AN-2 and deposited at the Guangdong Provincial Microbial Culture Collection Center (GDMCC) with accession number GDMCC NO: 63697. Compared with other isolated strains, *Aspergillus niger* AN-2 exhibits high lead tolerance and adsorption capacity for Pb. 2+ It has the strongest tolerance and is most tolerant to Pb. 2+ The MIC is as high as 3500-3800 mg / L. When this strain is processed into biomass, it exhibits excellent adsorption performance for lead, making it suitable for preparing bioremediation agents for heavy metal pollution. It has broad application prospects and high economic value.

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 provides a method for monitoring contamination on the surface of a graphite plate and removing contamination, and belongs to the technical field of semiconductors, and the contamination monitoring method comprises the following steps: enabling the front surface of a wafer to face downwards, placing the wafer on the surface of the graphite plate, placing the wafer in baking equipment for high-temperature baking, taking out the wafer, observing contamination on the surface of the wafer, and collecting metal on the front surface of the wafer by using a sampling solution. A plasma inductively coupled mass spectrometer is used for testing the sampling liquid, and then the metal contamination on the surface of the graphite disc is judged; the stain removal method comprises the following steps: putting a graphite disc into a chamber of baking equipment, and removing metal stains by adopting a combined method of high-temperature baking in an H2 environment and high-temperature baking in an HCl environment; argon is introduced into the cavity, so that the graphite disc is purged by the argon, and metal contamination is removed; and finally, cooling the graphite plate. According to the method for monitoring the contamination on the surface of the graphite disc and removing the contamination, the contamination on the surface of the graphite disc can be monitored and removed, and the metal contamination removing effect is improved.

The present invention discloses a method for synergistically solidifying heavy metal contaminated soil at the estuary of the sea using urease and its modifiers in combination with microwave technology, including: 1. Mix soy flour and deionized water, stir and centrifuge to remove soybean dregs, and take the supernatant as the urease solution; 2. Mix the urea solution and the calcium salt solution to obtain the cementitious liquid; 3. Crush waste concrete waste to obtain fine building aggregates, and add milky quartz powder to make a urease-induced carbonate modifier; 4. Dig the surface heavy metal contaminated soil and mix it with the modifier in step 3, and air-dry it; 5. Add water to the air-dried contaminated soil to the optimal moisture content and backfill it; 6. Lay a white cleaning cloth on the surface of the backfilled contaminated soil, pour the urease solution and the cementitious liquid in sequence, and use the self-weight seepage to make the urease solution and the cementitious liquid penetrate into the interior of the contaminated soil; 7. Turn on the microwave generator to irradiate the soil. The present invention can solidify heavy metal contaminated soil in a high salinity environment, reduce the leaching concentration of heavy metals in the contaminated soil, and improve the strength of the contaminated soil.

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 application provides a heavy metal contaminated soil remediation device, and relates to the technical field of soil remediation, which comprises a soil remediation vehicle, a soil reaction bucket is slidably installed in the soil remediation vehicle, a reagent tank is arranged on the soil remediation vehicle, the reagent tank is used for placing chemical agents, a purification tank is arranged on the soil remediation vehicle, the purification tank is used for purifying harmful substances, a rotating mechanism for spraying the chemical agents is arranged in the soil reaction bucket, in the application, the compact soil particles are broken up by the stirring rod, the soil becomes more loose, the soil particles are more evenly dispersed, and the contact area of the soil and the subsequently added chemical agents is increased; in the traditional soil remediation process, it is difficult to ensure the uniformity of soil stirring, the linkage assembly of the application avoids the complicated process of manual intervention, the soil treatment efficiency is greatly improved, and the reaction efficiency of the subsequent chemical agents and heavy metals is significantly improved.

The utility model discloses a heavy metal contaminated soil remediation throwing device, which belongs to the technical field of soil remediation and comprises a liquid medicine box, a feeding hopper is mounted on the upper surface of the liquid medicine box in a penetrating manner, a hopper cover is mounted on the outer surface of the feeding hopper in a threaded manner, and a liquid medicine pump is fixedly mounted on the upper surface of the liquid medicine box. A water inlet of the liquid medicine pump is communicated with the liquid medicine box; the liquid medicine box is arranged to be used in cooperation with the liquid medicine pump and the conveying assembly, the conveying assembly is composed of a plurality of conveying pipes matched with communicating pipes, the conveying pipes can be installed above soil by being pricked into the ground through the ground pricking nails on the supporting rods, and liquid medicine in the liquid medicine box is pumped by the liquid medicine pump and sprayed out through the liquid medicine spray heads to achieve soil treatment; compared with a walking type throwing device with wheels, the device does not need to walk back and forth in the soil, the problem of compaction of the soil is avoided, operation is convenient, one-time or multi-time liquid medicine throwing can be achieved only by installing the conveying pipe, and the working efficiency and the operation convenience are 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 relates to the technical field of soil remediation, and particularly discloses a heavy metal contaminated soil remediation method. The remediation method for the heavy metal contaminated soil comprises the steps that the soil remediation agent is applied to the heavy metal contaminated soil, under the action of interface water, reducing components in the soil remediation agent react with heavy metal ions in the contaminated soil, toxic high-valence heavy metal is reduced into low-valence non-toxic heavy metal, and then the heavy metal in the low-valence non-toxic heavy metal is remedied. The converted low-valence non-toxic heavy metals are fixed by using carbonaceous components in the soil remediation agent, so that remediation of the heavy metal contaminated soil is realized; wherein the soil remediation agent is a Fe3NatC composite material prepared from red mud.

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 present invention belongs to the field of heavy metal contaminated soil remediation technology and provides a heavy metal contaminated soil remediation agent and its use method. The remediation agent is composed of the following substances in parts by weight: 35-45 parts red mud, 25-30 parts white mud, 15-20 parts iron sulfate, 2.5-7 parts calcium oxide, and 2.5-8 parts lime. The heavy metal contaminated soil remediation agent of the present invention is mainly based on red mud and white mud, solving the problem of resource utilization of red mud and white mud, turning waste into treasure; it has low cost, simple and easy use method, and great economic benefits; and can effectively repair soil contaminated by arsenic, cadmium, lead and their composite heavy metals.