394 results about "Metal contamination" patented technology

The invention provides a comprehensive evaluation method and system for the remediation effect of heavy metal contaminated soil, and relates to the technical field of environmental engineering.The method specifically comprises the steps that remote sensing data of a contaminated area is obtained, a soil sample is collected, the microbial respiration rate and the soil physicochemical property of the soil sample are measured, the remote sensing data are processed, and a normalized vegetation index is obtained; generating a soil health assessment index based on the collected physical and chemical properties of the soil; integrating the soil evaluation index, the microbial respiration rate and the normalized vegetation index to construct a soil remediation evaluation index; and comparing the remediation evaluation index with a preset evaluation threshold value, and evaluating the remediation effect of the heavy metal contaminated soil. According to the method, the soil health evaluation index and the remediation evaluation index are constructed, so that the evaluation accuracy of the remediation effect of the heavy metal contaminated soil is effectively improved. Through multivariate correlation analysis, biological, chemical and physical characteristics of the soil can be comprehensively reflected, and a scientific basis is provided for subsequent management and remediation measures.

The invention discloses a flood area heavy metal pollution source identification and risk assessment system based on machine learning, and relates to the technical field of heavy metal pollution. Flood prediction is carried out through the environment data; extracting flood circulation data of the target area from the flood prediction data, and determining a heavy metal pollution source; performing diffusion analysis on the heavy metal pollution source to obtain the heavy metal concentration of the flood in the target area; taking the heavy metal concentration of the flood in the target area as an input parameter of a pre-trained machine learning model to obtain a heavy metal variation of soil in the target area; and performing risk assessment according to the original heavy metal concentration and the heavy metal variation of the soil in the target area to obtain a risk level of the target area. According to the method, the heavy metal pollution range and intensity under the influence of flood can be recognized in advance, so that decision basis is provided for managers, resources are allocated in advance, and the influence of flood and heavy metal pollution caused by flood on the environment and residents is reduced.

The invention provides marine-derived lactobacillus rhamnosus S400M01 and application thereof, and relates to the technical field of heavy metal adsorption and removal, the marine-derived lactobacillus rhamnosus S400M01 is preserved in Guangdong Microbial Culture Collection Center (GDMCC) on November 28, 2022, the preservation address is Guangzhou, and the number is GDMCCNO: 63001. The strain can tolerate cadmium chloride concentration up to 1000 mg / L, can tolerate lead concentration up to 800 mg / L, can adsorb and remove heavy metals cadmium and lead in squid viscera, and reduces accumulation of cadmium and lead in viscera of live crucian in a heavy metal polluted water body.

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 utility model discloses an in-situ groundwater heavy metal pollution remediation device. Comprising two permeable reactive barriers arranged at intervals in the groundwater pollution plume runoff direction. A filling cavity is formed between the two permeable reactive barriers, and filling materials are arranged in the filling cavity. According to the utility model, a double-unit permeable reactive barrier is adopted to carry out an in-situ remediation method, the first unit is filled with a zeolite and volcanic rock composite filter material to adsorb and capture heavy metal pollutants, and the second unit is filled with an active charcoal composite filler to further efficiently adsorb residual heavy metals. In addition, a plant planting zone is constructed for planting heavy metal hyperaccumulation herbaceous plants, pollutants such as heavy metal in underground water are thoroughly removed through the absorption and stabilization effect of plants, and the underground water is purified. The device adopts stable, economic, efficient and safe active filler to adsorb and remove heavy metals in underground water, and has the advantages of efficient restoration, strong applicability, ecological environmental protection and the like.

The invention discloses a heavy metal contaminated soil ecological risk assessment method, and belongs to the technical field of pollution assessment, and the method specifically comprises the steps: dividing a to-be-detected contaminated region into a plurality of grids, collecting indexes in soil of each grid intersection point, and calculating a pollution risk score of each grid intersection point; interpolation data fitting is carried out in the grids through a radial basis function interpolation method, and a contour map of the pollution risk scoring map is generated; selecting a contour line with the maximum numerical value in the contour map, marking the contour line as an initial contour line, determining an initial connection point, sequentially searching an end point connection point, which is longest from the initial connection point of the current contour line, in next-level contour lines, connecting all connection lines, and marking an obtained line segment set as a heavy metal pollution path. Corresponding heavy metal pollution treatment measures are taken according to the soil pH value, the soil ventilation capacity and the soil water content distribution condition in the pollution path; according to the invention, the serious pollution area and the diffusion trend can be clearly identified.

The invention discloses a method for promoting phytoremediation of heavy metal contaminated soil by combining modified charcoal with microorganisms, and relates to the technical field of heavy metal contaminated soil remediation. The repairing agent is prepared and comprises an inner layer, a middle layer and an outer layer, envelopes are arranged among the layers, the outer layer is further coated with an outer envelope, the inner layer comprises modified biochar and a first microbial agent, the middle layer comprises modified biochar and a second microbial agent, and the outer layer comprises dolomite powder and oyster shell powder. According to the invention, the remediation agent is combined with the heavy metal enrichment plants to carry out synergistic remediation on the contaminated soil, so that the enrichment plants can grow well under the high-acid high-concentration heavy metal environment condition, the problem of low biomass of the enrichment plants is solved, and finally, the efficient remediation of the contaminated soil is realized.

The invention relates to the technical field of soil pollutant migration and early warning, and particularly discloses a geophysical soil pollutant migration and early warning simulation method, which comprises the steps of S1, mounting a geophysical detection equipment component, S2, data acquisition, S3, data processing and S4, data imaging. The induction electromagnetic method is generally used for rapid exploration investigation, stratum conductivity distribution is rapidly obtained, a conductivity abnormal area is found out, and help is provided for subsequent geophysical method construction. The ground penetrating radar is mainly suitable for stratums, underground pipeline positions, underground storage tank positions, shallow waste burying thickness and distribution, underground tank leakage, shallow DNAPL / LNAPL pollution and heavy metal pollution. In an underground pollution survey project, a ground penetrating radar method is mainly used for finding out positions of underground metal, pipelines and electromagnetic wave attenuation, measuring line arrangement and construction are facilitated through a high-density electrical method, and the application range of the high-density electrical method comprises hydrogeological detection, large underground structure detection, underground groove leakage detection and the like.

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 invention provides an ecological risk assessment method and system for heavy metal contaminated soil, and relates to the technical field of soil pollution treatment. The method comprises the following steps: acquiring a soil sample set of a target area; constructing a space grid model of the target area according to the soil sample set; determining a comprehensive pollution index of the grid unit according to the concentration distribution information of the heavy metal; performing time sequence analysis on the space grid model, and predicting the dynamic migration trend of the heavy metal concentration corresponding to the grid unit; determining exposure threshold values of different ecological receptors in the grid units, and generating an ecological risk thermodynamic diagram of the target area according to the comprehensive pollution index, the dynamic migration trend and the exposure threshold values; and determining a risk position and a safety position from the target area according to the ecological risk thermodynamic diagram and a preset threshold value. Therefore, according to the scheme, the ecological risk of the target area can be evaluated more comprehensively and accurately, and the accuracy and reliability of risk evaluation are greatly improved.

The invention discloses a method for repairing heavy metal polluted underground water based on a slow-release repairing agent. The method comprises the following steps: S1, preparing an external slow-release material; s2, preparing an internal sustained-release material; s3, designing a dosing well; and S4, calculating the dosage. According to the invention, two different sustained-release materials are used as the basis and are coated with each other to form the sustained-release repairing agent, and the inner sustained-release material has stronger adsorption capacity, so that the problem of poor effect of the outer sustained-release material under the condition of high-concentration heavy metal polluted underground water can be solved; meanwhile, the outer slow-release material can further assist and slow down release of the inner slow-release material, finally, a set of long-term treatment scheme suitable for various complex heavy metal polluted groundwater is formed by matching with the special repairing agent tubular column and a dosage correction formula, and the effective repairing effect on groundwater heavy metal pollution can be achieved.

The utility model discloses a heavy metal contaminated soil multidirectional leaching device which comprises a leaching box, and a base is fixedly arranged at the bottom end of the inner wall of the leaching box. The top end of the base is connected with a top plate through an up-down reciprocating vibration structure, and shaft seats are fixedly arranged at the four corners of the top end of the top plate. Then the rotating shaft is connected with the centrifugal position of a shaking disc in a penetrating mode, in the rotating process, the shaking disc makes contact with the side wall of the soil containing box and is matched with a spring on the outer wall of a sliding rod, the soil containing box can transversely shake, and an up-down shaking structure can help to achieve vertical mixing of soil; and the transverse vibration structure can promote uniform distribution of the soil in the horizontal direction, so that uniform mixing and full mixing of the soil and the leacheate are achieved, the soil at the bottom of the soil containing box is turned to the top, and the soil leaching efficiency is improved.

The present invention provides a model for intercropping restoration of heavy metal contaminated soil between hyperaccumulators and low-accumulator crops and a construction method thereof, and belongs to the technical field of heavy metal contaminated soil restoration models. The invention comprises the following steps: planting hyperaccumulators and low-accumulator crops according to the intercropping pattern of hyperaccumulators and low-accumulator crops; collecting parameter information, performing regression analysis, constructing a heavy metal low-accumulator crop yield model and a heavy metal contaminated soil restoration efficiency model; and verifying the heavy metal low-accumulator crop yield model and the heavy metal contaminated soil restoration efficiency model by trial and error. The establishment of the intercropping competition yield model and the restoration efficiency model between low-accumulator crops and hyperaccumulator plants clarifies the competitive relationship between intercropped plants, provides a theoretical basis for evaluating the restoration effect of the intercropping pattern, helps to demonstrate and promote the intercropping restoration technology, and is of great significance to the social, economic, and ecological benefits of the restoration area.

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 relates to the technical field of soil treatment, and provides a heavy metal contaminated soil treatment device which comprises a mounting plate, a treatment barrel is fixedly welded to the top end face of the mounting plate, a fixing frame is fixedly welded to the top end face of the treatment barrel, and a soil sampling backfilling assembly is mounted in the treatment barrel. A multifunctional processing assembly is installed in the processing cylinder, the soil taking and backfilling assembly comprises a servo motor and a conveying cylinder, a first smashing blade and a drilling cylinder are welded and fixed to the conveying cylinder, a cutting blade is welded and fixed to the bottom end face of the drilling cylinder, and the multifunctional processing assembly comprises a rotating frame and a first connecting pipe; a first through hole is formed in the first connecting pipe, and a second connecting pipe is fixedly connected to the first connecting pipe. By means of the technical scheme, the problems that in the prior art, a heavy metal contaminated soil treatment device cannot conduct deep treatment on soil in a contaminated area, and chemicals cannot be evenly mixed with the soil are solved.

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 relates to the technical field of heavy metal pollution analysis, in particular to a farmland heavy metal pollution source analysis and pollution source influence evaluation method. The method comprises the following steps: collecting area monitoring data; determining environmental factors of heavy metal enrichment or accumulation in the regional soil sample; carrying out refined analysis on various environmental factors to determine the corresponding environmental factors as environmental driving factors for influencing the heavy metal content change of the regional soil sample; identifying key environment driving factors; determining a non-linear relationship between the heavy metal content of the regional soil sample and the key environment driving factor; and quantifying the critical conditions of the corresponding key environment driving factors, and identifying the soil heavy metal content change under the action of the plurality of key environment driving factors. The spatial distribution condition of soil heavy metal pollution is deeply analyzed, so that the influence of various environmental factors on the soil heavy metal pollution is evaluated. The comprehensive influence condition of more environmental factors on the soil heavy metal can be reasonably reflected.

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 utility model relates to the technical field of soil screening, and discloses heavy metal contaminated soil screening equipment. The heavy metal contaminated soil screening equipment comprises a shell assembly, a screening structure assembly is installed in the shell assembly, a first air spraying structure is installed at the upper end of the screening structure assembly, an air spraying pipe is installed at the lower end of the first air spraying structure, and a shaking spring is installed at the lower end of the air spraying pipe; a mounting frame is mounted at the upper end of the shaking spring, a first screen is mounted at the upper end of the mounting frame, a conveying assembly is mounted at the upper end of the shell assembly, a storage box is mounted at the upper end of the conveying assembly, a crushing rod is mounted in the storage box, and a conveying frame is mounted at the lower end of the storage box; and the situation that when a traditional screening device conducts screening, soil is manually poured into the screening device, the upper end of a filter screen is blocked when the subsequent soil has the caking phenomenon, and subsequent use cannot be conducted is effectively prevented.

The invention discloses a soil remediation agent suitable for heavy metal polluted mining wasteland and a preparation method of the soil remediation agent. The soil remediation agent comprises the following raw material components in percentage by mass: 20-40% of fly ash; 5-15% of slag; 5-20% of steel slag; 20-40% of red mud; 2-5% of gypsum; 8 to 10 percent of montmorillonite; 3-4% of an exciting agent; and 2-3% of a stabilizer. The powder prepared from industrial waste is selected and doped into the heavy metal polluted mine soil, heavy metal in the soil is solidified, the leaching toxicity of the heavy metal is reduced, meanwhile, the pH value of the soil can be adjusted, and after the heavy metal polluted mine soil is treated by the prepared heavy metal polluted mine soil remediation agent, the use of a site can be restored; the problem of insufficient land is solved, and site resource recycling is achieved.

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 discloses a heavy metal polluted farmland soil remediation device, relates to the technical field of soil remediation, and aims to solve the technical problem that when traditional equipment stirs soil, soil blocks cannot be effectively decomposed, and consequently the size of soil particles is nonuniform, the heavy metal polluted farmland soil remediation device comprises a tank body, and the inner wall of the bottom of the tank body is fixedly connected with a frame; a mixing mechanism is arranged in the tank body; the mixing mechanism comprises a top cover, a crushing unit and a separating unit; and the top cover is fixedly connected to the top of the tank body. The stirring barrel is driven to stir soil, the protruding blocks make contact with the soil to decompose soil blocks, meanwhile, the stirring barrel is used in cooperation with the smashing unit, the coagulated soil blocks can be decomposed and fully mixed with liquid medicine, the mixed soil is upwards discharged into the packing auger through the separating unit, the mixture is outwards discharged and precipitated, and therefore the soil can be separated out. Solid and liquid are separated, so that the influence on agricultural cultivation due to excessive water content in soil is avoided, and the applicability of the device is improved.

The invention discloses an in-situ remediation method and system for heavy metal contaminated soil. The method comprises the steps that a remediation area is established in situ along the heavy metal contaminated soil, an external electric field is applied to the two ends of the remediation area, enrichment plants are evenly planted in the remediation area, the external electric field is communicated with a direct-current power source, and the voltage gradient of the remediation area is controlled to be 0.3 V / cm to 0.5 V / cm. The heavy metal contaminated soil is remedied through the enrichment plants, meanwhile, the anode electrolysis chamber and the cathode electrolysis chamber are used for applying an external electric field to the remediation area, the remediation efficiency is greatly improved through cooperation with the enrichment plants, and the purpose of cleaning the contaminated soil is achieved.

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 discloses a method for preparing a heavy metal contaminated soil stabilizer from electrolytic manganese residues and landfill leachate and application of the heavy metal contaminated soil stabilizer, and belongs to the field of hazardous waste resource utilization. According to the method, the preparation process is simple, the needed raw materials are wide in source and easy to obtain, the high-activity heavy metal contaminated soil stabilizer is prepared through reasonable burdening, roasting enrichment, hydrothermal activation and secondary burdening reaction, and full utilization and efficient recycling of the electrolytic manganese residues are achieved. The prepared heavy metal contaminated soil stabilizer can remarkably reduce the leaching concentration of various heavy metal pollutants in soil, so that the stability of the heavy metal pollutants in the soil is improved.

The invention relates to the field of soil remediation in environmental protection, in particular to a heavy metal contaminated soil rotational flow crushing grading reduction and enhanced elution method and system. The method comprises the following steps: carrying out first-stage rotational flow crushing pre-sequencing classification or multi-stage rotational flow crushing pre-sequencing classification on heavy metal polluted soil with the particle size of less than 0.2 mm after vibratory screening until the heavy metal content of underflow soil reaches the standard, and premixing overflow generated by all classification and leacheate in a material tank; the formed mixed material is divided into underflow and overflow after being subjected to rotational flow intensified elution, the underflow and the overflow after being subjected to rotational flow intensified elution are introduced into the material tank, and the underflow after being subjected to rotational flow intensified elution is filtered and dehydrated after the content of the heavy metal in the soil in the material tank reaches the standard, so that the soil with the heavy metal reaching the standard is obtained. Agglomerated soil particles are dispersed into coarse particles with low heavy metal content and fine particles with high heavy metal content through rotational flow crushing, pre-sequencing and grading, the amount of soil needing to be leached is reduced, and the polluted soil reaches related standards after being treated.

The invention relates to the technical field of soil remediation, and particularly discloses a biochar material for remediation of heavy metal polluted saline-alkali soil and a remediation method. The biochar material is prepared from 55 to 65 parts of modified biochar, 5 to 10 parts of humic acid-sulfur coated microspheres, 2 to 8 parts of sepiolite powder, 2 to 5 parts of polylactic acid coated nano zero-valent iron material, 2 to 5 parts of diatomite and 1 to 3 parts of ammonium dihydrogen phosphate; the modified biochar is biochar loaded with iron and manganese oxides; the humic acid-sulfur coated microspheres are microsphere particles with a degradable polylactic acid coating layer, and humic acid and sulfur are wrapped in the degradable polylactic acid coating layer; the polylactic acid coated nano zero-valent iron material is a core-shell structure material formed by taking polylactic acid as a shell and nano zero-valent iron as a core; the size of the modified charcoal, the humic acid-sulfur coated microspheres and the polylactic acid coated nano zero-valent iron material is 80-120 meshes. The method is helpful for improving the adsorption capacity of heavy metals in the saline-alkali soil.