467 results about "Polluted 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 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 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 discloses a microbial agent and a method for repairing cadmium-polluted rice field soil by using the microbial agent, relates to the technical field of repairing cadmium pollution of rice field soil, and solves the problem that the cadmium metal enrichment capacity of duckweed is limited due to the fact that the duckweed has certain endurance capacity to cadmium stress. The microbial agent comprises bacillus subtilis ATCC6633 and pseudomonas aeruginosa ATCC27853, and the mass ratio of the bacillus subtilis ATCC6633 to the pseudomonas aeruginosa ATCC27853 is 2: 1, and the method comprises the following steps: step 1, spreading the microbial agent on the surface layer of cadmium-polluted rice field soil, then mixing the microbial agent with the rice field soil, raking the rice field soil, adjusting the water-holding capacity of the rice field soil, applying a base fertilizer, and irrigating the rice field. According to the method, the cadmium tolerance of the duckweed can be promoted, so that the enrichment capacity of the duckweed on cadmium is promoted, the remediation capacity of the duckweed on cadmium-polluted soil is improved, the cadmium content in the soil can be reduced, and the content of metal cadmium in rice is also reduced through a competitive cadmium absorption way.

The invention provides a chemical restoration method for treating heavy metal-polluted terrain soil by ferromagnetic artificial nucleuses. In a ferromagnetic artificial nucleus soil restoration method, the ferromagnetic artificial nucleuses are applied to heavy metal-polluted soil; soil above a heavy metal pollution depth is overturned by cultivation equipment to uniformly mix with the ferromagnetic artificial nucleuses; and after heavy metal can be dispersed from the soil to the artificial nucleuses by a period of time, the soil containing the artificial nucleuses is overturned by using the cultivation equipment to increase the change of the artificial nucleuses contacting with other soil. After the soil overturning procedure is repeated by multiple times, the cultivation equipment provided with magnets can be used for separating the ferromagnetic artificial nucleuses, absorbed with the heavy metal, from the polluted soil; and the content of the heavy metal of the polluted soil is reduced due to shifting-out of the ferromagnetic artificial nucleuses, so that the purpose of soil restoration is gradually achieved.

The invention belongs to the technical field of environment, and particularly relates to an environment-friendly biological agent for repairing and treating petroleum polluted water and soil and a preparation method of the environment-friendly biological agent. The biological agent is prepared by mixing a compound microbial agent, a biological surfactant and an auxiliary material in parts by mass, has the characteristics of high efficiency, environment friendliness and no secondary pollution, can remarkably improve the remediation efficiency of petroleum-contaminated soil, and has a wide application prospect.

The invention relates to the technical field of solid waste recycling, in particular to a method for preparing ceramsite through multi-element solid waste co-treatment. The method comprises the following steps: S1, uniformly stirring and mixing waterworks sludge, washing-free waste incineration fly ash, polluted soil and iron tailing slag powder in proportion to obtain a stirred mixture; s2, directly putting the stirred mixture which is uniformly mixed and is in a wet state into a ceramsite drying and granulating kiln, and granulating in the kiln to obtain raw material balls; s3, the raw material balls enter a pyrolysis section in the kiln to be subjected to low-temperature pyrolysis treatment; s4, the pyrolyzed raw material balls enter a calcining kiln to be subjected to high-temperature sintering treatment; and S5, passing the obtained sample through a cooling kiln, and taking out the cooled sample to obtain the multi-element solid waste ceramsite. According to the method, pure solid waste is adopted for preparing the ceramsite, and the links of raw material drying and granulation in traditional ceramsite manufacturing are omitted. The sludge of the waterworks, the waste incineration fly ash, the polluted soil and the iron tailing slag are utilized in a high-valued manner, the energy consumption is low, and less secondary environmental pollutants are generated.

The invention discloses a plant-microorganism combined uranium pollution treatment method which comprises the following steps: planting seeds of disinfected uranium-tolerant plants into soil to be remediated, and applying a bacterial suspension of uranium-tolerant strains, namely rhodotorula M1, aspergillus M2 and bacillus M3, into the soil to be remediated, so that the uranium enrichment capacity of the uranium-tolerant plants is remarkably improved; and a relatively good effect of repairing the uranium-polluted soil in the medium-temperature climate region is achieved. Uranium-tolerant plants can be harvested manually or mechanically and transferred to a safe place in a centralized manner to be treated, so that uranium-contaminated soil in the medium-temperature climate zone is effectively repaired.

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 invention discloses a pseudomonas for antimony detoxification and autotrophic nitrogen fixation and application of the pseudomonas. The strain is separated from the rhizosphere of a pioneer plant in antimony-polluted soil of a tin mine in cold water river city, Hunan province, and is identified to be capable of quickly oxidizing high-toxicity antimony (III) into low-toxicity antimony (V) through autotrophic metabolism in a high-antimony environment, so that antimony detoxification is realized, and the detoxification rate is 108.6 (mu mol / (L.day)). The strain has autotrophic nitrogen fixation activity and can achieve autotrophic growth under the oligotrophic condition of a mining area, and the nitrogenase activity is larger than or equal to 223.4 (nmol C2H2 / (g.h)). Particularly, the antimony detoxification and nitrogen fixation capabilities of the strain have a synergistic effect, so that the strain has unique advantages in the field of heavy metal antimony pollution remediation, and dual effects of antimony pollution treatment and soil improvement can be synchronously realized; the development and application prospects are good.

The invention discloses a method for improving cadmium accumulation and transport capacity of sedum plumbizincicola, and relates to the field of plant heavy metal pollution remediation. The method comprises the following steps: preparing a selenium solution with the selenium ion concentration of 5 [mu] M, adding the selenium solution into the cadmium-polluted water environment, planting sedum plumbizincicola seedlings in the cadmium-polluted water environment, and carrying out cultivation management; plant pretreatment: culturing sedum plumbizincicola seedlings in non-polluted soil for at least three generations, selecting sedum plumbizincicola plants which are uniform in size and healthy in growth vigor, and pre-culturing the sedum plumbizincicola plants in a Hoaglands nutrient solution for two weeks for rooting; the healthy plants are transferred into Hoagland nutrient solution containing selenium solution to be cultured, and the plants are harvested after 28 days. According to the method, the high-concentration cadmium polluted water environment is simulated, and selenium is applied in the growth period of the sedum plumbizincicola, so that absorption and enrichment of the sedum plumbizincicola on cadmium are promoted, the plant biomass is improved, the toxic effect of cadmium on plants is relieved, and efficient remediation of the sedum plumbizincicola on the cadmium polluted environment is achieved.

The invention relates to a petroleum polluted soil polycyclic aromatic hydrocarbon migration path simulation experiment system, which comprises a main reaction cabin, a mechanical arm collaborative operation module, a multi-mode sensing module, a whole natural environment regulation and control module and an edge intelligent decision-making platform, an annular magnetic suspension track is arranged at the top of the main reaction cabin, and a soil sample chamber is arranged at the bottom of the main reaction cabin; the multi-modal sensing module comprises an EIT (electrical impedance tomography) module, an LIBS (laser-induced breakdown spectroscopy) module and a terahertz time-domain spectroscopy module and is used for measuring global conductivity distribution of soil in a soil sample chamber, inverting the porosity of the soil sample and a pollutant concentration field in pore water, analyzing the concentration of carbon, hydrogen and oxygen elements of pollutants and specifically detecting polycyclic aromatic hydrocarbon molecules; the edge intelligent decision-making platform interacts with the multi-mode sensing module, the full-natural-environment regulation and control module and the mechanical arm collaborative operation module to actively adjust system parameters, and repair intervention is carried out on soil body degradation. And automatic preparation of the polluted soil can be realized, and migration monitoring under different practical engineering application working conditions can be realized.

The invention discloses an acid contaminated soil carbon emission reduction method based on a coupled ecological system, which comprises the following steps: adding rice straw biochar into acid contaminated soil, planting plants which are perennial ryegrass, and after the plants are cultivated to a mature period, strengthening the photosynthesis capability of the plants and the carbon sequestration capability of the soil at the same time, so as to improve the carbon sequestration capability of the acid contaminated soil. The negative increase of the CO2 emission cumulant and the remediation of the acidic polluted soil are realized. According to the method, the emission cumulant of CO2 in the acid polluted soil is greatly reduced, the total absorption amount of CO2 reaches up to 193.41 g / m < 2 >-304.41 g / m < 2 >, and the method has the advantages that raw materials are low in cost and easy to obtain, operation is easy, the operation cost is low, secondary pollution is avoided, and the method is suitable for large-scale use and has wide application prospects in the field of carbon emission reduction of the acid polluted soil (such as heavy metal pollution).

The invention relates to the technical field of phytoremediation of Cd-polluted soil. The invention provides Cd-resistant bacillus cereus as well as application and a method of the Cd-resistant bacillus cereus in remediation of Cd-polluted soil, the preservation name of the bacillus cereus is Bacillus cereus 01, the Latin name of the bacillus cereus is Bacillus cereus, the bacillus cereus is preserved in Guangdong Microbial Culture Collection Center, the preservation number of the bacillus cereus is GDMCC No: 65570, and the preservation time is December 2, 2024. The efficient Cd-resistant endophytic bacteria are obtained through screening and identification, the Cd-resistant endophytic bacteria are combined with the smooth vetch to repair Cd-polluted soil, absorption of succeeding crops to Cd is reduced, the food safety problem caused by standard exceeding of Cd is reduced, and the method has the advantages of being low in cost, high in repair efficiency, simple and convenient in treatment step and the like.

The invention relates to a biochar material for repairing cadmium and tetracycline combined pollution in a water body as well as preparation and application of the biochar material, and belongs to the technical field of water body pollution repairing. Comprising the following steps: (1) cleaning, drying and grinding plant tissues of solanum nigrum plants after the cadmium-polluted soil is repaired by fungi and solanum nigrum, so as to obtain solanum nigrum plant tissue powder; and (2) pyrolyzing the black nightshade plant tissue powder at 400-600 DEG C for 1-3 hours, cooling to 20-30 DEG C, and grinding to obtain the biochar material for repairing cadmium and tetracycline combined pollution in the water body. According to the invention, the plant tissue of the nightshade plant after the cadmium-polluted soil is repaired by the combination of fungi and nightshade is used as the raw material of the biochar material for the first time, so that the resource utilization of the polluted soil repairing plant is realized. The problem of plant treatment after polluted soil remediation is solved, consumption of extra resources is avoided, and the sewage treatment cost is greatly reduced.

The invention relates to a construction method of a foundation pit support structure for replacing polluted soil, which comprises the following steps of: 1, carrying out refined investigation and three-dimensional modeling on a polluted site, and making a three-dimensional electronic map; secondly, pollution removal dynamic planning is conducted, soil layers with different pollution depths and underground water are partitioned through a three-dimensional electronic map, drainage wells are arranged according to the pollution depths of the different partitions, holes are formed through a casing pipe rotary drilling method, and the situation that in the drilling process, the upper layer soil body, the lower layer soil body and the underground water are subjected to layer mixing pollution is prevented; thirdly, earth excavation is accurately controlled; 4, constructing a retaining structure: constructing secant piles and a waterproof barrier outside the pit; 5, hierarchical control of a precipitation system: arranging a drainage well and an emergency precipitation well; and sixthly, staged excavation is conducted, specifically, layered excavation is conducted, and temporary bottom sealing plate construction is completed.

The invention belongs to the technical field of environmental treatment, and particularly relates to a combined treatment method for polluted soil and carbon emission reduction and a system utilizing the combined treatment method. The polluted soil and carbon emission reduction combined treatment method provided by the invention comprises the following steps: sequentially filling a reaction tower with a mixture of polluted soil, calcium peroxide and slag, a first mixture of the polluted soil and the calcium peroxide and a second mixture of the polluted soil and the calcium peroxide from bottom to top; the reaction tower filled with the filler is obtained; the content of calcium peroxide in the second mixture is higher than that of the first mixture; activating the filler in the reaction tower filled with the filler so as to decompose organic pollutants in the polluted soil, and then introducing waste gas containing carbon dioxide to perform carbon immobilization, so as to respectively obtain purified soil and purified waste gas; the activating treatment mode comprises the step of introducing steam into the reaction tower. The synergistic interaction of soil pollutant removal and carbon immobilization is achieved, industrial waste heat and waste are fully utilized, and the resource utilization rate is increased.

The invention relates to the field of environment, resource utilization and agricultural biotechnology, in particular to application of a composite solid phosphate-solubilizing bacterial agent to remediation of cadmium-contaminated soil and improvement of soil quality, in the application, the composite solid phosphate-solubilizing bacterial agent comprises phosphate-solubilizing bacteria, bone black, a culture medium and an organic matrix; the phosphate solubilizing bacteria are pantoea agglomerans CT-3 and enterobacter hormaechei HS-6; the composite solid phosphate-solubilizing bacterial agent is applied to Cd-polluted soil, the bio-availability of Cd in the soil is reduced through synergy of pantoea agglomerans CT-3, enterobacter hormaechei HS-6 and micron-nano multi-stage bone black, and meanwhile, the soil quality is improved. On one hand, the application can effectively promote conversion of insoluble phosphate into soluble phosphate, so that the content of available phosphorus in soil is increased by 98.19%; on the other hand, soil heavy metal Cd can be fixed, so that the content of available Cd in the soil is reduced by about 52.50%, and the soil remediation agent has excellent Cd fixation capacity, can relieve Cd stress of crops, and has good application value in the aspects of farmland Cd pollution remediation, soil quality improvement and environmental protection.

The invention relates to the technical field of soil heavy metal pollution remediation, and particularly discloses a preparation method of iron-modified biomass charcoal, which comprises the following steps: preparing garden waste into biomass charcoal (PBC), and then carrying out iron modification by using FeCl3 to obtain iron-based biomass charcoal (PIBC). The invention further provides a method for repairing the cadmium-arsenic combined polluted soil through the iron-modified garden waste biochar. The method comprises the steps that the iron-modified biomass charcoal prepared through any method is added into the soil; the iron-modified biomass can be applied as a base fertilizer at one time, and is turned over to be fully and uniformly mixed with a plough layer of soil. By adopting the method disclosed by the invention, the bioavailability of Cd / As in the soil can be synchronously reduced, and waste resources are utilized to realize pollution control by waste.

The utility model discloses a soil sampler for preventing sample pollution, which belongs to the technical field of soil sampling and comprises a mounting table, a plurality of support units are arranged on the mounting table, a plurality of guide columns are sleeved on the mounting table, the top ends of the guide columns are slidably connected with a driving ring, a push arm is arranged on the upper surface of the driving ring, and the push arm is slidably connected with the guide columns. The inner circumferential surface of the driving ring is connected with a connecting bush through a connecting arm, the inner circumferential surface of the connecting bush is rotatably connected with a driving handle through a connecting piece I, and the mounting table is sleeved with a sampling module for soil sampling. The extension units can drive the sampling unit and the drilling unit to rotate by rotating a driving ring, the sampling unit is controlled to sample soil by rotating a driving handle, and a plurality of extension sections are quickly connected under the cooperation of a first inserting groove and a first inserting block; a worker can conveniently carry the device to a sampling site and then quickly mount and dismount the device, so that the device is convenient to carry and transport.

The utility model relates to a system suitable for purification treatment of organic contaminated soil, which comprises a thermal desorption unit, a primary purification unit, a secondary purification unit, a GWH heat exchanger and an adsorption unit which are connected in sequence, and further comprises a GGH heat exchanger, the thermal desorption unit is of an indirect heating structure and is internally provided with a soil channel and externally provided with a heating channel; the adsorption unit is connected with a recycled flue gas inlet in the heating channel through a purified flue gas pipeline, and a fan is arranged on the purified flue gas pipeline. According to the utility model, the organic polluted soil can be efficiently purified in an industrial plant, the operation is reliable, the investment and operation cost is low, the service life of equipment is long, and secondary pollution is avoided.

The invention provides a remediation method for hexavalent chromium polluted underground water, and relates to the technical field of water treatment. According to the preparation method, rice hulls are adopted as raw materials and treated through an oxygen-limited pyrolysis-ferric salt dipping composite technology, and the rice hull-based iron-rich biochar material is obtained; loading microorganisms with the rice hull-based iron-rich biochar material to obtain an adsorption material; the adsorption material is used for carrying out adsorption treatment on the hexavalent chromium-containing polluted underground water. Aiming at Cr (VI) polluted underground water, a prepared rice husk-based iron-rich biomass material is adopted to load domesticated soil indigenous microorganisms, and the domesticated soil indigenous microorganisms are added into a nearly neutral Cr (VI) polluted soil / underground water reaction system, so that efficient reductive degradation of Cr (VI) is realized, and the influence mechanism of Fe < 3 + > is explored.

The invention discloses an organic contaminated soil remediation method based on a compound bacterium remediation agent. The organic contaminated soil remediation method comprises the following steps: S1, biochar modification: FeCl3 and LaCl3. 7H2O modified biochar is obtained; s2, culturing compound bacteria, namely mixing the ectotrophic substance sphingosine bacterium suspension and the staphylococcus xylosus suspension in an equal volume manner to obtain a compound bacteria suspension, wherein the sphingosine bacterium suspension and the staphylococcus xylosus suspension are mixed in an equal volume manner; s3, immobilizing compound bacteria; and S4, soil remediation. Aiming at the soil jointly polluted by a plurality of organic polluted soils, two microbial bacteria which are relatively good in synergism and relatively good in degradation effect on organic pollutants are screened out as compound bacteria, and meanwhile, in order to further improve the action effect and activity of the compound bacteria, the compound bacteria are loaded on specific biochar through a series of means, so that the compound bacteria can be used for preparing the biochar. The activity can be further improved, so that the synergistic degradation of various organic pollutants in the soil is improved, and a good effect is achieved.

The invention discloses a magnetic iron mineral and phosphate tailing material and application thereof in treatment of arsenic and cadmium pollution. A low-cost phosphate tailing material is taken as an object, and an environmental functional material loaded with magnetic gamma-Fe2O3 and other iron minerals is prepared by adopting a method of'rapid thermal activation-primary addition of a modifying agent-mineral phase conversion '. The magnetic iron mineral and phosphate tailing material can efficiently adsorb cadmium ions, arsenate ions and arsenite ions, has a synchronous adsorption effect on coexisting cadmium ions and inorganic arsenic, and can be used as an efficient passivation repair material for arsenic-cadmium combined polluted soil. The material also has magnetism, is easy to separate and recover, and also can be combined with a magnetic separation technology to serve as a material for synchronously removing arsenic and cadmium pollutants in a water body or soil.

The invention belongs to the technical field of heavy metal pollution treatment, and relates to preparation of a weakly alkaline soil cadmium passivator and a method for passivating soil lead. The alkalescent soil cadmium passivating agent mainly comprises the following components in parts by weight: 20 to 30 parts of graphene oxide modified biochar, 5 to 10 parts of montmorillonite, 5 to 10 parts of bentonite and 5 to 10 parts of a microbial agent, the microbial agent is a composite microbial agent formed by mixing bacillus subtilis, bacillus amyloliquefaciens, bacillus thuringiensis and pseudomonas nitroreducens. The alkalescent soil cadmium passivator has a very good remediation effect on cadmium and lead in polluted soil, can remarkably improve the physicochemical properties of the cadmium and / or lead polluted soil, increase the content of organic matters in the soil, reduce the migration of the soil in the environment and reduce the content of cadmium in crops, and has a great market popularization value.

The invention discloses a Pseudomonas nicosulfurones bacterial strain and an application of the Pseudomonas nicosulfurones bacterial strain in degradation of phenanthrene and benzopyrene. According to the invention, a degradation strain Pseudomonas nicosulfurensis DY-8, which takes phenanthrene and benzopyrene as carbon sources, is obtained by domestication, separation and identification from petroleum-polluted soil in Ningbo. The invention also relates to a method for preparing the degradation strain Pseudomonas nicosulfurensis DY-8 with phenanthrene and benzopyrene as carbon sources. The DY-8 can utilize phenanthrene and benzopyrene as carbon sources, and after the DY-8 is cultured in an inorganic salt culture solution with the initial concentration of phenanthrene and benzopyrene being 50 mg.L <-1 > and 25 mg.L <-1 > respectively for 7 days, the degradation rates of phenanthrene and benzopyrene can reach 70% or above. Therefore, the strain has good application potential in the aspect of bioremediation of polycyclic aromatic hydrocarbon.

The invention relates to the technical field of soil pollution treatment, and discloses a phosphate passivation condition-based soil cadmium vertical migration law analysis method, which comprises the following steps: selecting a cadmium-polluted soil column, applying a calcium magnesium phosphate fertilizer as a passivator to the soil column part, carrying out a soil column solute penetration experiment, collecting pore water at different depths through side sampling holes, and determining the vertical migration law of cadmium in the soil column; measuring a measured value; the method comprises the following steps: establishing a one-dimensional migration-reaction model based on a Hydrus-Phreeqc coupling module, simulating migration and transformation of cadmium in soil and chemical reaction with phosphate, and obtaining a simulation value; according to the actual measurement value and the simulation value, the Hybrid-Phreeqc coupling module is corrected, and the vertical migration characteristics of cadmium are analyzed; after the soil column experiment is finished, soil samples are collected from top to bottom, and the distribution of cadmium in the soil is detected and analyzed. According to the method, the soil column experiment is combined with the Hydrus-Phreeqc coupling model, so that the influence of applying the calcium magnesium phosphate fertilizer on the vertical migration of the soil cadmium can be more systematically analyzed; the method is easy to operate, high in practicability and capable of being applied to remediation research of different heavy metals.

The invention discloses a method for repairing arsenic and cadmium polluted soil and safely producing wheat. The method comprises the following steps: 1, preparing a soil repairing agent; 2, soil slightly polluted by arsenic and cadmium is selected, and base fertilizer and the soil remediation agent prepared in the first step are evenly mixed into the soil slightly polluted by arsenic and cadmium; thirdly, sowing low-accumulation metal wheat seeds into the soil slightly polluted by arsenic and cadmium in the second step, and performing cultivation management; 4, in the wheat ripening process, the composite leaf surface blocking and controlling agent obtained in the second step is sprayed to wheat leaves for multiple times; and 5, after the wheat is mature, harvesting the wheat. The invention aims to provide a method capable of synchronously promoting the restoration of arsenic-cadmium polluted soil and the safe production of wheat so as to realize the coordination of the restoration work and the production work.

The invention discloses high-urease microbial gel, a preparation method and a method for repairing uranium-polluted soil by using the high-urease microbial gel, and belongs to the technical field of environmental pollution microbial treatment. The preparation method comprises the following steps: 1) mixing sodium alginate, urea and a water-retaining agent to obtain a carrier solution; 2) uniformly mixing the high urease bacteria solution in the logarithmic phase with the carrier solution according to a volume ratio of 5-25% to obtain a bacteria solution mixture; and (3) dropwise adding the bacterial liquid mixture into a cross-linking agent which is stirred at a constant speed for cross-linking and curing, and freeze-drying to obtain the high-urease microbial gel. The high-urease microbial gel is applied to the periphery of a root system of a uranium-enriched plant planted in uranium-contaminated soil to be repaired, and uranium-contaminated soil is repaired through combination of microorganisms and plants. Urease-producing bacteria in the high-urease microbial gel induce decomposition of urea to generate carbonate, uranyl ions in the soil are activated, the mobility of uranium in the soil is improved, and extraction of uranium in the soil by uranium-enriched plants is promoted.