1955 results about "Contaminated soils" patented technology

The invention provides a petroleum hydrocarbon pollution remediation method based on soil microorganisms, and provides an innovative solution aiming at the problems of high cost, high energy consumption and secondary pollution of an existing remediation technology. The method comprises the following steps: firstly, carrying out sampling analysis and pretreatment on polluted soil, screening out a microbial strain capable of efficiently degrading petroleum hydrocarbon, and fixing the microbial strain on a biochar carrier to form an immobilized microbial composite material; then, the material is added into the contaminated soil, and tolerant plants are planted to construct a combined remediation system. Meanwhile, nutrient substances such as nitrogen and phosphorus and a surfactant are added, so that the bioavailability and the microbial degradation efficiency of the petroleum hydrocarbon are improved. In the repairing process, the petroleum hydrocarbon content and the microbial activity are monitored regularly, and the repairing scheme is dynamically adjusted. According to the method, the biochar is prepared from agricultural waste, the cost is reduced, efficient and environment-friendly remediation is achieved by combining the synergistic effect of microorganisms and plants, and the method has remarkable economic and environmental benefits and is suitable for treatment of soil polluted by various petroleum hydrocarbons.

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 relates to the technical field of soil remediation, and discloses a remediation treatment method and system for simulating cadmium-contaminated soil and a storage medium. The method comprises the following steps: detecting and analyzing the adsorption performance of the remediation material according to soil cadmium content data to obtain remediation material performance data; based on the soil cadmium content data and the remediation material performance data, carrying out data processing on a pollutant migration rule to obtain pollutant migration characteristic data; carrying out data analysis on the repair material combination by utilizing the pollutant migration characteristic data to obtain material combination effect data; according to the material combination effect data, the repair process is dynamically detected, and repair effect data are obtained; and performing data evaluation on the remediation scheme by utilizing the remediation effect data to generate a cadmium-contaminated soil remediation scheme. According to the method, the performance of the repairing material, the pollutant migration rule and the repairing effect are accurately evaluated, and the scientificity and the reliability of the repairing scheme are improved.

The invention relates to the technical field of in-situ / ex-situ remediation of sites polluted by heavy metals such as cadmium, lead, copper and zinc, and discloses a heavy metal polluted soil remediation system and method based on intelligent management and control. The system comprises an electrode system module, an activator module, a targeted adsorption device module, an automatic monitoring system module, an intelligent decision-making system module and a photovoltaic power supply module. The method comprises the steps of driving heavy metal ions in soil to directionally migrate through an electric field; the activating agent module works, green micromolecule organic acid and other activating agents are injected in a gradient mode, and the migration efficiency of heavy metal is improved; activated heavy metal ions can be captured by an adsorption material in the targeted adsorption device module in cooperation with a selective enrichment device; meanwhile, the automatic monitoring system module collects environmental parameters in real time; the intelligent decision-making system module optimizes the remediation efficiency and energy consumption according to the real-time data, and low-cost and high-efficiency remediation of soil heavy metal pollution is achieved. The remediation efficiency is remarkably improved, and the risk of secondary pollution is reduced.

The invention discloses an agricultural solid waste contaminated soil remediation device, and relates to the field of soil remediation, the agricultural solid waste contaminated soil remediation device comprises a base plate, a storage box and a first liquid outlet pipe, the bottom of the base plate is fixedly connected with four electric wheels, the upper portion of the base plate is fixedly connected with a handheld handrail, the storage box is fixedly connected to the upper portion of the base plate, and the first liquid outlet pipe is fixedly connected to the base plate; the upper end of the first liquid outlet pipe penetrates through the base plate to communicate with the storage box, the bottom of the base plate is fixedly connected with a first extension plate, and the first extension plate is fixedly connected with a first motor. According to the device, soil on the filter plate is vibrated, so that the soil leaks out of filter holes in the filter plate, and building concrete stones larger than the filter holes cannot fall off; and the concrete stones embedded in the soil can be effectively removed, and the blocking of the stones can be reduced during the subsequent injection of the repairing liquid, so that the repairing liquid can be fully permeated into the soil.

The invention relates to the technical field of environmental remediation, and discloses a biochemical synergistic remediation method for heavy metal contaminated soil, which comprises the following steps: S1, sampling the heavy metal contaminated soil, and analyzing the type, concentration and occurrence form of heavy metals of the heavy metal contaminated soil; s2, extracting active ingredients of polyphenols, organic acids or alkaloids from the plant materials; s3, applying a plant source activating agent to regulate the chemical form of the heavy metal in the soil and promote the activation of the heavy metal; s4, inoculating a functional microbial agent to enhance the heavy metal immobilization, transformation and phytoremediation capabilities; s5, planting hyperaccumulators, and cooperatively using the plant extract, the plant source activator and the microbial agent; s6, plant residue treatment and soil improvement. Through the synergistic effect of the plant extract, the plant source activator, the microbial agent and the hyperaccumulator, the plant source activator, the microbial agent and the hyperaccumulator can jointly act on the heavy metal contaminated soil from multiple ways, and chelating, activating, degrading and fixing of heavy metal are rapidly achieved.

The invention discloses an ecological restoration effect evaluation and simulation system after polluted soil restoration, and relates to the technical field of soil restoration, and the system comprises a soil feature generation module which generates an ecological feature data set; the ecological restoration evaluation module is used for establishing a multi-dimensional evaluation model by using an analytic hierarchy process and a fuzzy comprehensive evaluation method based on the ecological characteristic data set, and generating an ecological restoration effect index; the dynamic simulation prediction module is used for constructing an ecological restoration dynamic simulation model and simulating the evolution trend of a soil ecological system under different environment conditions; and the restoration strategy optimization module is used for generating a targeted ecological restoration optimization scheme by combining a preset restoration strategy library according to the ecological restoration effect index and the dynamic simulation prediction result. According to the method, a closed-loop system integrating multi-source data acquisition and processing, multi-dimensional evaluation, dynamic simulation prediction and stepped strategy optimization is constructed, and accurate evaluation of the ecological restoration effect after contaminated soil restoration and scientific optimization of the restoration strategy are achieved.

The invention relates to the field of environmental remediation, and discloses a remediation method for high-concentration organic pollutants in soil, which comprises the following steps: firstly, injecting a nano zero-valent iron (nZVI) suspension into the contaminated soil for chemical reduction treatment, then adding sodium persulfate for oxidation treatment, and then adding a nano zero-valent iron (nZVI) suspension into the contaminated soil; the complex organic pollutants are converted into biodegradable intermediate products; then, two-stage microbial communities are introduced in sequence, the first-stage microbial community is used for degrading alcohol and ketone intermediate products, the second-stage microbial community is used for degrading organic acid intermediate products, and thorough mineralization of pollutants is achieved. According to the method, the pollutant degradation rate and the final removal effect can be remarkably improved, and the method is suitable for treatment scenes of various high-concentration organic pollutants and has high adaptability and economic benefits.

The invention discloses a method for restoring soil heavy metal pollution by coupling soybean urease with a charcoal cementing agent, and relates to the technical field of soil heavy metal pollution restoration, and the method comprises the following steps: dynamic microbiome regulation and control: introducing photosensitive protein into soil functional bacteria; the acyl homoserine lactone analogue is synthesized and applied to soil, and is competitively combined with a microbial quorum sensing receptor to block an inhibitor to secrete a signal channel; according to the method, microbial urease secretion is regulated and controlled through optogenetics, an inhibitor signal is blocked through quorum sensing interference, and a microbiome is precisely regulated and controlled; the pH-responsive nanocapsule releases an inhibitor in a targeted manner, and the magnetic-responsive nanochain dynamically captures interfering bacteria, so that the limitation of passive adsorption is broken through; the gene editing plant releases coumarin to inhibit fungal metabolism, and the engineering mycorrhizal fungi physically shields an inhibitor to construct cross-biosphere cooperative defense; the urease activity and the heavy metal removal rate are remarkably improved, meanwhile, the soil microbial diversity is maintained, and the soil specificity interference problem is solved.

The invention belongs to the technical field of agricultural fertilizers, and provides a soil remediation fertilizer and a preparation method thereof. The preparation method comprises the following steps: S1, sequentially drying and crushing a natural organic matter material to obtain a pretreated natural organic matter material; s2, mixing the pretreated natural organic matter material, microbial flora, a plant growth regulator, a stabilizer and a slow release agent, and performing fermentation treatment to obtain a compound fertilizer; s3, sequentially drying, granulating and packaging the compound fertilizer to obtain the soil remediation fertilizer. The soil remediation fertilizer provided by the invention can effectively solve the remediation problem of organic matter and heavy metal contaminated soil, improve the soil quality and promote plant growth, and has remarkable environmental protection and agricultural sustainable development benefits.

The invention provides a coal-based solid waste composite material and application thereof, and belongs to the technical field of soil remediation. The coal-based solid waste composite material is successfully prepared from 400 to 600 parts of desulfurized gypsum, 100 to 300 parts of fly ash, 100 to 300 parts of wood fiber, 80 to 120 parts of humic acid, 10 to 30 parts of sodium silicate, 8 to 12 parts of EDTA (Ethylene Diamine Tetraacetic Acid), 8 to 12 parts of citric acid and 10 to 30 parts of hydroxyapatite, so that the problem that a soil remediation agent in the prior art cannot solve the high-concentration heavy metal combined pollution condition is solved, and the remediation effect is improved. According to the coal-based solid waste composite material and the soil remediation method, the release amount of various high-concentration heavy metals in polluted soil can be effectively reduced, the properties of the soil are not affected, and the coal-based solid waste composite material and the soil remediation method can be used for follow-up crop cultivation, achieve long-term remediation of the soil and have wide application value and development potential.

The invention relates to the technical field of environmental restoration, in particular to a slow-release material for synergistically restoring heavy metal and organic compound contaminated soil based on modified biochar and microorganisms and an application method thereof.The slow-release material is prepared from, by weight, 50-80 parts of modified biochar, 30-40 parts of sodium alginate, 10-20 parts of gelatin, 5-10 parts of glycerin and 3-5 parts of calcium carbonate. The multi-modified biochar is prepared from, by weight, 300-400 parts of a functional flora mixed solution and 5-10 parts of mixed nutrient elements of glucose, yeast extract and KHPO, and through the synergistic effect of the multi-modified biochar and the functional flora, efficient immobilization (the immobilization rate gt is 60%) of heavy metal (lead, cadmium and chromium) and efficient degradation (the degradation rate gt is 70%) of organic pollutants (polycyclic aromatic hydrocarbon and petroleum hydrocarbon) are achieved.

The invention discloses stenotrophomonas 215 and application thereof in relieving cadmium stress of crops, and belongs to the technical field of microorganisms. The stenotrophomonas sp. Is separated from paddy field soil, and is named as stenotrophomonas sp. 215, and the preservation number of the stenotrophomonas sp. 215 is GDMCC (China General Microbiological Culture Collection Center) No.65475. The stenotrophomonas 215 provided by the invention is applied to cadmium-contaminated soil, can relieve the toxic action of cadmium stress on crop growth, especially for wheat production, can remarkably reduce the content of cadmium in wheat growing in the cadmium-contaminated soil by utilizing the strain, can remarkably improve the wheat yield, has obvious effects of relieving cadmium stress and promoting growth, and has good application prospects. The method is an environment-friendly alleviation measure.

The invention discloses a method for promoting bacillus soil microorganisms to actively absorb oxygen to degrade long-chain alkanes, which comprises the following steps: preparing a catalyst: uniformly mixing oil-containing soil, a carbon source, citric acid, ferric salt, hydrogen peroxide and distilled water, filtering, concentrating clear liquid to obtain a concentrated crystal substance, centrifugally cleaning the crystal substance, and drying to obtain the catalyst; the method comprises the following steps: mixing a catalyst with oil-containing soil, hydrogen peroxide and distilled water, and oscillating on a shaking table for Fenton pre-oxidation; after pre-oxidation, intermittent oscillation oxygenation is carried out, bioremediation is carried out on the petroleum-contaminated soil at normal temperature, and the three petroleum bacteria in the soil are activated. Through pre-oxidation treatment, consumption of soluble organic carbon by microorganisms in soil is stimulated, the active oxygen uptake process of the microorganisms is accelerated, and the carbon metabolism process is accelerated. Finally, the bacillus-like microorganisms capable of degrading the petroleum are activated, so that the aim of degrading the petroleum hydrocarbon in the soil for a long time is fulfilled.

The invention relates to the technical field of soil remediation, and discloses a method for synergistically remediating organic contaminated soil by combining microorganisms with plant root systems, which comprises the following steps: carrying out physicochemical property detection and condition adjustment on the contaminated soil in a target remediation area; applying a composition containing functional microorganisms and a controllable release activation component to the contaminated soil; plants with rhizosphere secretion ability are planted in the restoration area; plant root exudates are used for inducing the composition to release active components, so that microorganisms are activated, and organic pollutants are jointly degraded; and maintaining the repair cycle, and performing process regulation and control until the repair is completed. A double-layer microcapsule structure is constructed, the outer layer adopts chitosan and an induction material, and the outer layer can swell or disintegrate under the action of plant rhizosphere secretions, so that responsive release of active components of the inner layer is achieved, and the effect of improving release accuracy and microbial activation efficiency is achieved.

The invention discloses efficient carbon sequestration Brucella from an oil-containing solid waste residue source and application of the efficient carbon sequestration Brucella. The Brucella is Brucella sp A54-5 with the preservation number of CCTCC (China Center for Type Culture Collection) NO: M20241650. The Brucella is obtained through ARTP mutagenesis and screening by taking Brucella Brucella sp A54 separated from oil-containing solid waste residues of an oil field as a starting strain, has excellent characteristics of reducing pollution and sequestration carbon and relatively strong stress resistance, and has the advantages of deep recycling (soil transformation) of the oil-containing solid waste residues, improvement of the carbon sequestration capacity of petroleum-contaminated soil and improvement of the oil-containing solid waste residues. The method has a wide application prospect in the fields of petroleum-polluted soil remediation and the like, and has great significance in pollution reduction and convergence increase in petroleum and petrochemical industries under the background of supporting double carbon.

The invention belongs to the technical field of biology, and particularly relates to plant growth promoting performance of two alkali-producing strains, namely, Plutalophilous rhizobium and Pseudomonas moorsei, and application of the two alkali-producing strains to cadmium fixation and fertility increase of soil. The invention provides a multifunctional alcaligenes, which is any one of the following strains: Pentazobacterium mionense WW22, the preservation number of which is CGMCC (China General Microbiological Culture Collection Center) No. 27718, and the preservation number of which is CGMCC No. 27718. The invention discloses pseudomonas mohnii WW2, and the preservation number of the pseudomonas mohnii WW2 is CGMCC (China General Microbiological Culture Collection Center) No.27716. The invention also provides application of the strain for fixing cadmium and increasing fertility. The strain disclosed by the invention can promote the reduction of the effectiveness of cadmium in soil and increase the nutrient content in the soil, provides a technical basis for ensuring the safe production and utilization of crops in a cadmium-polluted farmland, and has a wide application prospect.

The invention provides a biochar composite porous material for heavy metal contaminated soil remediation and a preparation method and application of the biochar composite porous material. The preparation method comprises the steps that biomass raw materials are subjected to high-temperature pyrolysis carbonization and then smashed, ground and sieved, and biochar powder is obtained; dispersing in a phosphoric acid solution to obtain a biochar solution, and filtering, washing and drying after a hydrothermal activation reaction to obtain activated biochar; dispersing in a chitosan solution, carrying out ultrasonic oscillation, filtering, washing and drying to obtain modified charcoal; mixing sodium bentonite, attapulgite and deionized water, uniformly mixing the modified charcoal, the functional slurry and a sodium carboxymethyl cellulose solution to obtain composite slurry, performing compression molding to obtain a green body, and then drying and calcining the green body. The biochar composite porous material prepared by the invention can simultaneously play multiple roles of physical adsorption, chemical chelation, ion exchange and the like in a heavy metal contaminated soil treatment process, so that efficient fixation of various heavy metal ions is realized.

A system for on-site treatment of impacted soil may include a soil-treatment device, a sensing device, and a computing device. The soil-treatment device includes an inlet for receiving impacted soil from a contaminated site and a reactor configured to treat the impacted soil according to one or more operational parameters. The sensing device is configured to receive a sample from the impacted soil and perform, on-site during the treatment process, a measurement of the sample. The computing device includes a memory storing executable instructions and one or more processors. When executed, the instructions cause the processors to receive the measurement from the sensing device, apply a model to determine, during the treatment process and based on the measurement, a value of one of the operational parameters in the set, and output the determined value for the soil-treatment device to perform the treatment operation according to the operational parameters.

The invention relates to the technical field of environmental pollution remediation, in particular to a refuse landfill coupling contaminated soil remote remediation system and method. The method comprises the following steps: carrying out deep stratified sampling and soil sample characteristic classification on a remotely repaired polluted soil heap to obtain remotely repaired soil samples corresponding to different pollution types; purified biogas is obtained to serve as a heat source for organic pollution desorption and conversion and solidification and stabilization coupling remediation, and a soil sample containing heavy metal after solidification and stabilization remediation is generated; carrying out chemical environmental assessment analysis and cyclic remediation treatment on the soil sample containing the heavy metals after solidification and stabilization remediation to generate a soil sample after organic pollution and heavy metal remediation; and carrying out fly ash landfill and reutilization on the soil sample subjected to organic pollution and heavy metal remediation to generate the remedied remote fly ash landfill and reutilization soil. Refuse landfill resources and remote polluted soil remediation can be combined to realize corresponding soil recycling.

The present application relates to the field of soil remediation. Particularly disclosed is a petroleum-contaminated soil remediation method. The method comprises the following steps: thoroughly mixing a dilute hydrochloric acid solution of isooctanol polyoxyethylene ether phosphate or Triton with crushed petroleum-contaminated soil, r filtering and cleaning same, and then measuring the preliminarily cleaned contaminated soil; after the measurement shows said preliminarily cleaned contaminated soil is qualified, using a neutralizer to neutralize and remediate the preliminarily cleaned soil; and further filtering and cleaning same, and drying same to obtain cleaned remediated soil. The petroleum-contaminated soil remediation method provided by the present application can effectively remove petroleum contaminants from petroleum-contaminated soil, remove cadmium and arsenic from contaminated soil, and can also remediate soil damaged by petroleum contamination while removing contaminants. The present application is suitable for cleaning and remediation of petroleum-contaminated soil.

According to the microbial flora culture method for efficiently degrading the organic pollutants, three continuous culture stages of enrichment, domestication and optimization are adopted, parameters such as the temperature, the pH value, the rotating speed and the ventilatory capacity are accurately controlled in each stage, and growth of microorganisms with degradation capacity is promoted. Through multi-stage culture and domestication, the obtained flora has efficient degradation capability on organic pollutants such as petroleum hydrocarbons, pesticides and polycyclic aromatic hydrocarbons, and has strong adaptability to pollutants with different concentrations. The 16S rRNA gene is used for sequencing and identifying the flora, and composition and dominant strains are clear. The flora is prepared into a microbial inoculum, and the microbial inoculum is preserved by freeze drying or liquid nitrogen, so that the activity can be effectively maintained. The flora can be widely applied to the fields of polluted soil and water body remediation, industrial wastewater treatment and the like, is green and environment-friendly, is relatively low in cost, avoids secondary pollution, conforms to the concept of sustainable development, and has relatively high economic and environmental values.

The invention relates to the technical field of contaminated soil and construction waste treatment, in particular to a contaminated soil and construction waste mixing and conveying device which comprises a conveying mechanism, a driving unit, a cleaning unit and a scattering part. In the process of conveying a mixture, the mixture is heated and dried through external heating equipment, the inner surface of the screening roller is scraped and cleaned in real time through a scraping plate, contaminated soil is prevented from blocking the screening roller, meanwhile, the contaminated soil is scattered through a scattering part, the retention time of the contaminated soil in the area on the left side of the variable-pitch spiral plate is prolonged, and the screening efficiency is improved. The drying effect of the polluted soil is improved, and the screening and discharging efficiency and effect of the polluted soil are improved; by means of the characteristics that the pitch of the left side of the variable-pitch spiral plate is small and the pitch of the right side of the variable-pitch spiral plate is large, a mixture in the conveying process is gathered in a spiral pitch area with the small pitch of the left side of the variable-pitch spiral plate, and then it is ensured that the mixture is fully dried and scattered by family members in the area.

The invention discloses pantoea agglomerans ALC and application thereof in preparation of a plant growth-promoting bacterial fertilizer for aluminum-toxic soil, and belongs to the field of soil remediation, the pantoea agglomerans ALC is preserved in China General Microbiological Culture Collection Center on July 15, 2024, and the preservation number is CGMCC No.31309. The invention further discloses a preparation method of the pantoea agglomerans ALC and application of the pantoea agglomerans ALC in preparation of a plant growth-promoting bacterial fertilizer for aluminum-toxic soil. On one hand, citric acid is generated through the pantoea agglomerans ALC to chelate active aluminum, on the other hand, phosphate is generated through the pantoea agglomerans ALC to reduce the content of the active aluminum in the soil, and finally the content of the active aluminum in the aluminum-toxic soil is reduced, so that damage to plants and crops is reduced. The plant growth-promoting bacterial fertilizer for the aluminum-toxic soil, prepared by the invention, can be used for restoring heavy metal contaminated soil and also can be used for reducing stress of heavy metals on plants, promoting plant growth and increasing soil fertility, and a plurality of microorganisms have a synergistic effect, so that the restoration efficiency of the heavy metal soil is further improved through the synergistic effect.

The present invention discloses an alkali-resistant microbial bacterium PDC-1 and its application. The present invention screens and isolates PDC-1 strain from the soil of a coal gangue stockpile in a coal mine in Shandong, China, which can utilize naphthalene, phenanthrene, anthracene or pyrene as the sole carbon source and has tolerance to heavy metals. The strain of the present invention is capable to degrade various PAHs with the presence of heavy metals. The strain is alkali resistant, simple to cultivate, and has a good application in the bioremediation of polycyclic aromatic hydrocarbons and heavy metal contaminated sites.

A method for synchronously remediating organically contaminated soil and groundwater by means of electrokinetic coupled multiphase extraction. Cathode wells and anode wells are distributed in a staggered manner in an area to be remediated; a pipe filled with an electrolyte is inserted into each of the cathode wells and the anode wells; an extraction pipe is inserted into each cathode well; electrodes are connected to an electrokinetic remediation system; the extraction pipes are connected to a multiphase extraction system; by means of electrokinetic remediation, persulfate anions in a catholyte are injected into a stratum from the cathode wells and are then migrated to an anode by means of the action of electromigration, iron ions released by a sacrificial anode in an anolyte are migrated to a cathode by means of the action of electromigration and electrodialysis, and persulfate in soil and groundwater are activated during "opposite-direction" migration; then, the direction of an electric field is switched, and at the same time, electrolytes are added to corresponding electrode wells for "opposite-direction" migration, and remediation treatment is performed according to the above electrode-based remediation method and an electrode-based remediation method in which an electrode direction is switched, until organically contaminated soil and groundwater in the area to be treated are completely remediated at the same time; and the multiphase extraction system is started after the electrode-based remediation, and the electrolytes in the electrode wells are depleted. Further disclosed is the use of the method for synchronously remediating organically contaminated soil and groundwater by means of electrokinetic coupled multiphase extraction in in-situ remediation of organically contaminated soil.

The invention relates to the technical field of soil remediation, and discloses a garden soil pollution remediation device which comprises a supporting seat, the top of the supporting seat is fixedly connected with a material tank, the inner wall of the supporting seat is fixedly connected with a motor, the top of the supporting seat is fixedly connected with a waste gas tank, a heating mechanism is arranged in the material tank, and a stirring mechanism is arranged in the material tank. A cleaning mechanism is arranged in the material tank, a heating rod and a heat conduction circular ring move up and down in a reciprocating mode, soil at different depths in the material tank can be heated, the soil in the material tank is evenly heated, the heating speed of the soil is increased, the soil temperature can be increased through soil heating, and therefore dissolving and releasing of some heavy metal in the soil are accelerated; the remediation efficiency of the device on the contaminated soil can be improved, and the soil remediation cost of the device can be saved through indirect outflow of the catalyst.

The invention discloses a cadmium-contaminated soil remediation method which comprises the following steps: performing seedling vernalization prevention treatment on sedum plumbizincicola branches to obtain sedum plumbizincicola seedlings; then the sedum plumbizincicola seedlings are transplanted into the cadmium-contaminated soil, in the planting and growing period of the sedum plumbizincicola seedlings, the environment temperature is controlled to range from 8 DEG C to 25 DEG C, and field management is conducted regularly; and when the branches of the sedum plumbizincicola do not grow obviously within 15-20 days, harvesting the sedum plumbizincicola, and removing the harvested object from the field. According to the method, through anti-vernalization treatment and planting of the sedum plumbizincicola, the phenomenon that most plants die after flowering due to low-temperature vernalization of the sedum plumbizincicola can be avoided, so that the vegetative growth cycle of the sedum plumbizincicola is effectively prolonged, and then the absorption and remediation efficiency of cadmium in the cadmium-contaminated soil is improved.

The embodiment of the invention discloses a bioremediation device for organic contaminated soil. The bioremediation device comprises a photovoltaic electrolysis assembly, a mass transfer transition assembly and a soil remediation assembly. The photovoltaic electrolysis assembly generates oxygen and hydrogen through solar electrolysis of water; the mass transfer transition component is used for conveying gas to a bionic root system main body of the soil remediation component in a partitioned manner, a hydrogen injection hole is formed in the tail end of a first-stage branch to form an anaerobic micro-region, and an oxygen injection hole with a hydrophobic membrane is formed in the tail end of a second-stage branch to maintain an aerobic environment; the surface of the bionic root system is coated with a composite layer, titanium dioxide nanofibers are excited through an ultraviolet LED to generate holes to oxidize organic matter, and electrons are subjected to heavy metal reduction strengthening through a graphene grid. According to the method, the traditional microbial remediation period is shortened and the organic matters and the heavy metals are synchronously removed through triple mechanisms of gas partitioned and graded controlled release, photocatalysis-electrochemistry cooperation and in-situ electron targeted delivery, the whole process is completed in situ, earthwork excavation and outward transportation risks are avoided, and the method has the advantages of high efficiency, stability and environmental protection.

The utility model discloses a microorganism mixing device for contaminated soil remediation, comprising: a main structure; the main structure comprises a support plate, a connecting frame for connecting agricultural machinery is arranged on one side of the top of the support plate; a crushing mechanism; the crushing mechanism comprises a first crushing rod, a second crushing rod and a crushing arm, the first crushing rod and the second crushing rod are both rotatably mounted between the inner walls of both sides of the support plate, the first crushing rod and the second crushing rod are both welded with crushing arms, and the first crushing rod and the second crushing rod are driven by a motor; a spraying mechanism; the spraying mechanism comprises a storage box for storing microbial solution, a pump body and a spraying pipe, the storage box is arranged on the top of the support plate, and a plurality of groups of nozzles are arranged at the bottom of the spraying pipe. By cooperating with agricultural machinery, large-area contaminated soil can be remediated, which not only reduces the workload of soil remediation, but also has high remediation efficiency and low remediation cost.