138 results about "Arsenic pollution" patented technology

The invention relates to the technical field of remediation for synergistic treatment of rice field soil arsenic and greenhouse gas emission reduction, in particular to a zero-valent manganese nitrate synergistic soil remediation agent and application thereof to remediation of rice field arsenic pollution and inhibition of greenhouse effect. The invention provides a technical scheme for synergistically repairing arsenic pollution in the rice field and inhibiting the greenhouse effect based on zero-valent manganese / nitrate, an electron transfer shunt network driven by manganese circulation is constructed, a slow release reaction-dynamic regeneration-electron shunt three-in-one system is constructed, and synergistic interaction of arsenic fixation and greenhouse gas emission reduction is realized. According to the technical scheme, the potential regulation and control contradiction between arsenic fixation aerobic and carbon reduction anaerobic is successfully broken, and an innovative solution is provided for multi-target remediation of rice field soil. According to the self-sustaining circulating system, the specific surface area of the manganese oxide is stabilized at 50m < 2 > / g to 120m < 2 > / g, and the regeneration rate is gt; 95%. Experiments show that compared with a single technology, the synergistic treatment group improves the arsenic fixing efficiency to 100%, and the comprehensive emission reduction intensity of greenhouse gas reaches 76%.

The utility model provides harmless treatment equipment for arsenic-calcium slag. The harmless treatment equipment comprises a mixer, a medium-temperature volatilization furnace, a high-temperature decomposition furnace and a tail gas purification device, the mixer is provided with a mixed material inlet and a mixed material outlet, and the mixed material inlet is used for inputting arsenic-calcium slag and pyrite. The medium-temperature volatilization furnace is provided with a volatilization furnace material inlet, a volatilization furnace gas inlet, a volatilization furnace gas outlet and a volatilization furnace tailing outlet. And the volatilization furnace material inlet is connected with the mixed material outlet. The high-temperature decomposing furnace is provided with a decomposing furnace material inlet, a decomposing furnace gas inlet, a decomposing furnace gas outlet and a decomposing furnace tailing outlet. The material inlet of the decomposing furnace is connected with the tailing outlet of the volatilization furnace. The tail gas purification device is provided with a purification inlet and a purification outlet, and the purification inlet is connected with the volatilization furnace gas outlet and the decomposition furnace gas outlet. The harmless treatment equipment for the arsenic-calcium slag can effectively remove arsenic in the arsenic-calcium slag, avoid arsenic pollution, improve the utilization rate of pyrite and save cost and heat.

The invention provides an agricultural soil heavy metal rapid detection method, and belongs to the technical field of heavy metal detection.The method comprises the steps that a sample is pretreated, a soil sample is air-dried and then ground, and the ground soil sample is sieved through a 100-mesh sieve; digesting graphite, weighing a sample, adding aqua regia, and digesting in a graphite digestion instrument; iCP-MS detection parameter optimization is carried out, and optimal working parameters of an instrument are determined; quantitative analysis is performed, and a standard curve is drawn; result analysis: calculating the content of heavy metal elements in the soil according to a calculation formula; high-flux detection of mercury and arsenic pollution is realized through combination of an integrated pretreatment process and an instrument, a corrosion-resistant centrifugal tube is taken as an integrated reaction container, a dynamic digestion system of a graphite digestion instrument is combined, and the addition amount and extraction time of aqua regia are optimized, so that the reagent consumption is remarkably reduced on the premise of ensuring full-amount extraction of a target object, and the detection efficiency is improved. Meanwhile, the pollution risk and element loss caused by sample transfer in a traditional method are eliminated.

The invention discloses an underground water arsenic pollution range dynamic delimiting method based on multi-source data fusion, and the method comprises the steps: employing a fixed monitoring well and a mobile unmanned aerial vehicle water quality sensing device to cooperatively work, and constructing a dynamic monitoring network; hydrogeological data, hydrochemical parameters and meteorological data are integrated, a hydrochemical parameter inversion model is established, and arsenic form distribution is predicted through the Fe / S concentration ratio; carrying out three-dimensional pollution plume dynamic modeling by adopting an improved MT3DMS model, and introducing a time attenuation coefficient to correct adsorption-desorption kinetic parameters; establishing a pollution diffusion probability prediction model by using an XGBoost algorithm, and predicting a pollution diffusion boundary based on a machine learning algorithm; and performing visual output to generate a dynamic risk grading graph. According to the method, the arsenic pollution range can be dynamically updated, and the pollution range delimiting precision is effectively improved.

The invention relates to the technical field of wet-process phosphoric acid, and discloses a wet-process phosphoric acid grading and arsenic removal treatment method and system, and the system can be switched between a parallel grading treatment mode and a series depth treatment mode through flow control; in the parallel mode, the two arsenic removal reaction tanks operate independently to respectively treat different raw materials and produce desulfurized acid for industrial monoammonium and low-arsenic dilute phosphoric acid for high-phosphorus compound fertilizer, the low-arsenic dilute phosphoric acid is mixed and blended with untreated dilute acid and then concentrated, qualified products are obtained with the minimum treatment capacity, and the cost is remarkably reduced; in the series connection mode, raw materials sequentially flow through the two tanks to be deeply purified, and single high-quality phosphoric acid is produced; the two modes are both integrated with efficient filter pressing units, solid-liquid separation is carried out on arsenic-containing thick slurry generated by arsenic removal, and phosphorus resource recovery and arsenic pollution control are achieved; the device has production flexibility and deep purification capacity, perfectly meets the requirements of raw material fluctuation and multiple products, and thoroughly solves the problem of arsenic slag disposal.

The invention discloses a reduction and remediation method for arsenic pollution of rice field soil. The reduction and remediation method comprises the following steps: S1, rice seedling raising; s2, 1-2 weeks before rice transplanting, modified biochar is added into the arsenic-polluted rice field soil to be repaired, and then flooding treatment is conducted; s3, after 1-2 weeks, rice seedlings are transplanted in shallow water, and after rice seedlings turn green in 3-5 days, water strengthening management is conducted; s4, in the early heading stage of the rice, harvesting straw on the upper portion of the rice, separating the straw from the field, ploughing soil, deeply plowing, crushing and irrigating the soil, enabling roots to float on the water surface, and collecting all the roots and separating the roots from the field; s5, the field is leveled, water is drained till the surface layer contains shallow water, and the steps S2 to S4 are repeated. According to the method, the microorganisms are loaded on the biochar and are combined with water to strengthen and manage plant absorption, in the heading stage of the rice, the overground straw and the underground root system which are rich in arsenic are integrally removed and separated from the field, and periodic repeated operation is combined, so that the total amount of arsenic in the soil is substantially reduced.

The invention relates to an in-situ dynamic soil and underground water arsenic pollution remediation technology based on an iron arsenate-based material. According to the technology, iron arsenate is generated in situ in a polluted area through the synergistic effect of innovatively designed slow-release ferrite capsules and oxidants such as persulfate, and efficient immobilization of arsenic is achieved. Meanwhile, the electrochemical regulation and control technology and an intelligent monitoring feedback system are fused, the underground water oxidation and reduction conditions are dynamically optimized, the remediation process is precisely regulated and controlled, and the method adapts to the complex polluted environment. The technology has the advantages of being efficient, economical, environmentally friendly, high in intelligent degree and the like, and arsenic pollution in soil and underground water can be effectively remedied.

The invention discloses a polyurethane foam loaded schwertmannite material as well as a preparation method and application thereof, and belongs to the technical field of environmental governance materials. According to the material, polyurethane foam is added in the synthesis process of the Schwertmannite to complete loading of the Schwertmannite, the material has the advantages of efficient arsenic removal of the Schwertmannite and good adsorption performance of the polyurethane foam, and when the material is applied to treatment of arsenic-polluted water, efficient removal of arsenic can be achieved, and the material is greener and more environmentally friendly. The polyurethane foam loaded Schwertmannite material is simple in preparation process and has a good regeneration effect, regeneration and reutilization are achieved through elution of an alkaline solution, it is verified that the arsenic removal effect of the polyurethane foam loaded Schwertmannite material is not obviously affected, the utilization rate of the Schwertmannite material is greatly increased, and the treatment cost of arsenic-polluted water is reduced. The material provided by the invention can be suitable for in-situ treatment of different arsenic-polluted water bodies, is simple in use process and low in cost, and has a good application prospect.

The application discloses a kind of rice field soil arsenic pollution reduction repair method, comprising the following steps: S1, rice seedling raising;S2, in 1-2 weeks before transplanting, to the arsenic pollution rice field soil to be repaired modified biochar is added, then waterlogging treatment is carried out;S3, 1-2 weeks later, shallow water rice transplanting is carried out, and 3-5 days are waited for rice seedling to return green, and water is intensified management;S4, in early heading stage of rice, aboveground rice straw is harvested from field, then soil ploughing is deep ploughing and broken, irrigation is carried out, so that root system floats to water surface, and is all collected from field;S5, level field and drain to surface layer contains shallow water, repeat steps S2-S4.The application is loaded on biochar by microorganism and combined with the method of water intensification management plant absorption, in heading stage of rice, aboveground straw enriched with arsenic is removed from field with underground root system as a whole, and combined with periodic repetition operation, the total amount of arsenic in soil is substantially reduced.

The invention discloses a remediation agent for treating arsenic-polluted soil in an antimony ore area and a using method thereof.The remediation agent comprises a stabilizer and an eluting agent, hydrated iron oxide modified bentonite, nano-hydroxyapatite, manganese-loaded biochar and a chelating agent are compounded to serve as the stabilizer, and the components have a synergistic effect; arsenic in the polluted soil is effectively fixed and converted into stable residual arsenic. After the effect of the stabilizer, the eluting agent is used for oscillation elution, pollutants are promoted to be desorbed from the soil, the elution efficiency is further improved, efficient, long-acting and low-cost remediation of the arsenic-polluted soil is achieved through the combined effect of stabilization and elution, environment friendliness and engineering applicability are both achieved, and the method is suitable for popularization and application. The method achieves an excellent remediation effect on the whole, can improve the soil structure and enhance the ecological sustainability, and is particularly suitable for arsenic pollution treatment in the antimony ore area.

The invention belongs to the technical field of soil remediation, and particularly relates to application of a soil remediation agent in arsenic-contaminated soil remediation, and the soil remediation agent comprises a carrier and a bacterial suspension adsorbed and fixed on the carrier; the carrier is iron modified biochar; the bacterial strain in the bacterial suspension is bacillus subtilis W7, and the bacterial strain in the bacterial suspension is bacillus subtilis W7. The iron-modified biochar in the remediation agent is rich in adsorption sites, W7 can convert the arsenic form, the tolerance to high-concentration arsenic is poor, and plant absorption can be blocked, the iron-modified biochar and W7 in the remediation agent cooperate with each other, the remediation efficiency is high, the universality of the remediation scheme is strong, and the remediation agent not only aims at single crops (such as rice) or low-arsenic soil 1t, but also aims at single crops (such as rice) or low-arsenic soil 1t. The effect can be suddenly reduced in crops with high arsenic pollution, such as 80mg / kg or different absorption types, such as tuber potatoes, so that the safe utilization of the arsenic-polluted farmland is facilitated.

The invention discloses a repairing agent for promoting mineralization of arsenic in soil and a preparation method and application thereof.The preparation method includes the steps that after agricultural straw is smashed, the smashed agricultural straw and livestock and poultry manure are alternately stacked layer by layer for composting, and organic fertilizer is obtained; the method comprises the following steps: mixing an organic fertilizer with ultrapure water, performing ball milling in a ball mill, centrifuging the ball-milled mixed solution, and filtering to obtain a dissolved organic matter (DOM) extracting solution; and forming the repairing agent together with sulfate. When in use, the repairing agent is added into the arsenic-polluted soil, and then the arsenic in the soil is mineralized by anaerobic waterflooding soil culture. By the adoption of the scheme, the micromolecular active DOM can be easily obtained from agricultural straw and livestock and poultry manure, the micromolecular active DOM is matched with sulfate to be applied, the remarkable promoting effect on reduction of soil arsenic bioavailability is achieved, the method is low in cost, and agricultural solid waste resource utilization and soil safety are easily achieved.

The invention belongs to the technical field of heavy metal repair, and particularly relates to a soil heavy metal passivator containing selenium modified charcoal and a preparation method and application of the soil heavy metal passivator. According to the soil heavy metal passivator based on the selenium-modified biochar, the biochar is modified through the selenium element, the selenium element loaded on the biochar achieves effective adsorption of mercury, arsenic and cadmium in soil through the synergistic effect of the selenium element loaded on the biochar and organic functional groups of the biochar, and the selenium element loaded on the biochar and the biochar achieve the synergistic effect; effective adsorption of part of cadmium, arsenic and mercury is realized, effective fixation of arsenic, mercury and cadmium in soil is finally realized, and the fixation efficiency is high. The invention further provides application of the selenium modified charcoal soil heavy metal passivator obtained by the scheme or the selenium modified charcoal soil heavy metal passivator obtained by the preparation method in remediation of soil mercury pollution, soil arsenic pollution and soil cadmium pollution. The selenium modified charcoal soil heavy metal passivator disclosed by the invention can be directly added into soil to effectively fix arsenic, mercury and cadmium.

The invention discloses a method for removing arsenic in a water body. The method for removing the arsenic in the water body comprises the following steps: adding a metal organic framework material NO2-MIL-101 (Fe) into the water body to be treated, and stirring to adsorb arsenic ions so as to remove the arsenic in the water body. By optimizing a nitro ligand structure and surface properties of the MIL-101, the adsorption performance of the MIL-101 on arsenic pollutants is remarkably improved, so that an efficient water treatment effect is realized. The material disclosed by the invention is simple and convenient in synthesis process, low in energy consumption, easily available in raw materials and free of toxic by-products, and accords with the principle of green sustainable development. The material developed by the invention is expected to become an ideal choice for arsenic pollution treatment in the field of water treatment, and an efficient, economic and environment-friendly solution is provided for practical application.

A process for producing a catalyst comprising a metal from group VIB and / or a metal from group VIII, and an oxide support(s), characterized in that said process comprises recycling the metals from group VIB and / or VIII from a source catalyst comprising a metal common to the catalyst to be produced, said source catalyst being contaminated with coke, vanadium and arsenic, the process comprising: - an extraction of vanadium by an extraction solution comprising sulfuric acid, then - a regeneration, then - an extraction of the metal or metals from group VIB and / or VIII by an extraction solution comprising an organic compound having complexing properties, then - an impregnation of the support with an impregnation solution from said solution of extracted group VIII and / or VIB metal(s), said extracted metal(s) remaining in liquid phase from the extraction by sulfuric acid until the impregnation.

This invention belongs to the field of non-ferrous metallurgy and hazardous waste treatment technology, proposing a method for reducing arsenic content using a synergistic hydrothermal reaction of low-grade lead-zinc ore and polluted acid. The method involves pre-decalcifying the low-grade lead-zinc ore with dilute hydrochloric acid to remove interfering calcium carbonate. Then, by controlling the mass ratio of active metals such as Pb, Zn, and Fe in the ore powder to As in the polluted acid, under specific hydrothermal conditions, the in-situ release and induced precipitation of metal ions within the ore are stimulated, constructing thermodynamically extremely stable onionite and onionite-like mineral phases. The arsenic removal rate of this invention is consistently above 95%, and the stability of the arsenic-fixed products far exceeds national hazardous waste landfill standards. This method not only solves the problem of arsenic pollution from polluted acid but also simultaneously realizes the resource utilization of low-grade ore, demonstrating significant environmental and economic benefits.

The invention discloses an underground water arsenic pollution multiphase flow reaction migration substitution simulation method based on cDC-GAN, and relates to the technical field of underground water pollution simulation. The technical scheme is characterized by comprising the following steps: constructing a numerical model for simulating underground water multiphase flow and pollutant reaction migration process; the numerical model can output pollutant concentration spatial distribution according to input permeability field parameters and well location layout parameters; after the combination of permeability field parameters and well location layout parameters is changed, the numerical model is operated to obtain a data set, and then a training data set is formed; wherein the data set comprises input data and output data, the input data are permeability field and well location layout parameters, and the output data are corresponding pollutant concentration spatial distribution; constructing a cDC-GAN substitution model, wherein the cDC-GAN substitution model comprises a generator and a discriminator; the method has the effect of expanding the application scene of groundwater pollution simulation.

This invention relates to a method for remediating arsenic-contaminated farmland; the method includes the following steps: applying base fertilizer to the farmland and tilling it evenly, wherein the base fertilizer includes organic fertilizer, and the amount of organic fertilizer applied is 200-500 kg / mu; transplanting cotton seedlings into the farmland and managing water; irrigating the cotton seedlings with a prepared sodium silicate solution; managing fertilizer and planting during the cotton growth process, and applying an activator that promotes the translocation of heavy metals into the cotton plants; harvesting the cotton when it matures and cutting the straw. This remediation method, through planting cotton and using organic fertilizer, irrigation with sodium silicate solution, and application of an activator, can promote the absorption of the heavy metal arsenic by plants, thereby reducing the arsenic content in the soil while ensuring the economic benefits of the farmland. The planting technique is simple, highly operable, and can effectively solve the problem of planting in arsenic-contaminated farmland.

The application discloses a preparation method and use method of a composite soil conditioner and application thereof, relates to the technical field of soil remediation, and can improve soil structure, improve the composition of organic matter in soil, increase the Eh value of the rhizosphere soil of crops, increase the biomass of crops, and significantly reduce the biological availability and toxicity of arsenic and the arsenic content absorbed and accumulated by crops in edible parts of stems and leaves by multiple effects such as in-situ passivation of soil, formation of iron-arsenic precipitation, and formation of iron film / titanium film, so that arsenic is intercepted in inedible root parts.

The invention discloses an anaerobic methane oxidation mineral regeneration coupling treatment method suitable for low-concentration arsenic pollution, and relates to the technical field of environmental engineering and microorganisms. The method comprises the following components: S1, a layered reaction system construction and flora domestication preparation step, S2, a low-concentration arsenic reduction reaction step in a methane oxidation zone, S3, an As (III) fixation and stirring regulation step in a mineral generation zone, S4, a solid-liquid separation optimization step in a precipitation separation zone, and S5, a methane gas recycling and efficiency optimization step. The treatment efficiency and effect of low-concentration arsenic pollution are remarkably improved by designing a layered reaction system and combining the measures of flora domestication, dynamic regulation and control of the methane addition amount, accurate calculation of the Fe3 addition amount, optimization of the mineral generation rate and the like.

The invention discloses a phosphate-solubilizing bacterium W047 with resistance to various heavy metals and application of the phosphate-solubilizing bacterium W047, the taxonomic name of the phosphate-solubilizing bacterium W047 is Burkholderia ambifaria, the phosphate-solubilizing bacterium W047 is preserved in the China General Microbiological Culture Collection Center on January 6, 2025, and the preservation number of the phosphate-solubilizing bacterium W047 is CGMCC No.33300. The phosphate-solubilizing bacterium W047 is obtained by directly separating and purifying arsenic-polluted farmland soil by taking a PVK solid culture medium as a basic culture medium, and has the characteristics of dissolving insoluble inorganic phosphorus (calcium phosphate, iron phosphate and aluminum phosphate), fixing nitrogen, producing iron carriers and the like. The phosphorus-solubilizing strain W047 can remarkably promote dissolution of insoluble phosphorus in phosphate ore, and the soluble phosphorus content in supernatant of phosphate ore slices and powder samples under the condition of shake flakes in a laboratory is 92.94 + / -0.94 mg / L and 173.36 + / -21.17 mg / L. The bacterial strain can activate phosphorus in soil, and compared with a contrast, the available phosphorus in the soil added with bacterial liquid of the bacterial strain is increased by 15.48 + / -2.85 mg / kg after the soil is cultured for 20 days. The multiple functions of the strain W047 enable the strain W047 to have strong viability, and the strain W047 has important significance in enriching strain resources, reducing production cost, developing microbial agents and the like.

The invention relates to modified diatomite for repairing arsenic pollution of water and soil as well as a preparation method and application of the modified diatomite. The modified diatomite comprises diatomite as well as granular iron oxide and granular magnesium oxide which are loaded on the surface of the diatomite. According to the modified diatomite disclosed by the invention, the diatomite is subjected to composite modification by utilizing a hydrothermal method and an iron-magnesium compound, the modified diatomite is large in specific surface area, rough in surface and relatively strong in granular sensation, the fixing performance and the adsorption capacity on As (V) and As (III) are remarkably enhanced, and compared with single iron modification or magnesium modification or other metal modification, the modified diatomite has the advantages that the adsorption capacity is greatly improved; the effect of repairing arsenic-polluted water and arsenic-polluted soil is better when being applied to repairing arsenic-polluted water and arsenic-polluted soil. The preparation method of the modified diatomite is simple, high in operability and high in application adaptability; meanwhile, raw material sources are wide, and adaptability is wide.

The application belongs to the technical field of microorganisms, discloses a strain of Desmodesmus arsenicoxydans with arsenic oxidation function and application thereof in soil remediation, and specifically discloses a strain of Desmodesmus arsenicoxydans B3. The application separates a strain of microalgae B3 with arsenic oxidation function, the strain belongs to the genus Desmodesmus and can oxidize As(III) under day-night alternation conditions. Arsenic forms in a flooded soil solution are determined by using a liquid chromatography-atomic fluorescence spectrometer. Arsenic form analysis shows that As(III) is oxidized into As(V), the concentration of As(III) and total arsenic in soil pore water is reduced, which indicates that the Desmodesmus arsenicoxydans B3 can effectively oxidize As(III) and remove total arsenic in the soil solution under the condition of flooding, reduce the biological availability of arsenic, and play an important role in remediation of arsenic contaminated soil.

The application discloses a method for passivating arsenic pollution of tailings by modified biochar loaded nano zero-valent iron, and the method comprises the following steps: collecting wide-frequency electrochemical impedance spectrum data and passivation layer thickness data in real time through an integrated micro three-electrode system, establishing an initial passivation layer resistance value benchmark, and extracting current passivation layer resistance value and capacitance value in real time to calculate characteristic resonance frequency and minimum breakdown voltage; when the current passivation layer resistance value exceeds the preset multiple of the benchmark value, the fluctuation amplitude of the characteristic resonance frequency is less than a preset fluctuation threshold value, and the passivation layer thickness is in a preset interval, a sinusoidal alternating voltage is applied at the characteristic resonance frequency, a conductive channel is formed in the passivation layer by dielectric breakdown, and then the channel is stabilized by a direct-current reduction pulse, so that in-situ activation of the passivation layer and periodic recovery of material activity are realized.

The invention relates to a method for removing ethyl xanthate and arsenic in a water body through sulfur chemical fiber iron ore, and belongs to the technical field of environmental pollution treatment. According to the method, the S / Fe molar ratio of sulfur chemical fiber iron ore is regulated and controlled, and reactive oxygen species (ROS) generation and electron transfer mechanisms are combined, so that efficient degradation of ethyl xanthate and fixation of arsenic are realized. The preparation method of the sulfur chemical fiber iron ore comprises the steps of synthesis of lepidocrocite, vulcanization reaction, post-treatment and the like. When pollutants are removed, the sulfur chemical fiber iron ore is dispersed in an aqueous solution containing ethyl xanthate and / or arsenic, and the pollutants are removed through active oxygen oxidation, electrochemical oxidation, adsorption and coprecipitation, surface oxidation and other ways. The method has the advantages of environment friendliness, resource utilization, low cost, high adaptability and the like, and is suitable for treating mine wastewater, beneficiation wastewater and arsenic-polluted water.

The bimetallic sulfide crystal provided by the invention is small in particle and developed in intergranular gap, the bimetallic sulfide has enough active sites and sulfur vacancies under the optimal palladium-iron ratio (the molar ratio of palladium to iron is 1: 1), the arsenic capture rate of 90% can be kept within 100 minutes, and the bimetallic sulfide has a good arsenic capture rate under the condition of lower than 100 DEG C, and the arsenic capture rate of 90% can be kept within 100 minutes. And a relatively good arsenic removal rate (70-90%) can still be kept, so that a scientific basis is provided for development of a novel arsenic pollution control technology, and powerful support is provided for flue gas arsenic purification in a non-ferrous metal smelting process.

The application discloses a soil arsenic pollution dynamic evolution prediction method based on time sequence deep learning, and relates to the technical field of soil pollution. The method comprises information acquisition: obtaining soil information of a region to be predicted to obtain basic soil information. The application establishes a reference based on previous soil arsenic pollution by setting a reference establishment method, and obtains change information by using a control variable method to explore the changes of different arsenic forms under different conditions. The application completes dynamic evolution prediction of soil arsenic in target region information by using the reference directory and the change information as a benchmark for information matching through a pollution evolution method. The application obtains the final pollution condition by considering emergencies according to actual use requirements and reflecting the emergencies in the basic pollution condition through a redundancy adding method after optimization, and the whole purpose is to predict the arsenic condition in the soil at a future time by using historical observation data and external variables, and to provide a basis for risk early warning, management strategy evaluation and monitoring plan optimization.

This invention discloses a method for the simultaneous remediation of pesticide and arsenic pollution in acidic soil, belonging to the field of soil remediation technology. *Pseudomonas arsenicoxydans* Y24-2 is used as the remediation microbial agent, and calcium peroxide is used as remediation agent A. Sodium acetate, urea, potassium dihydrogen phosphate, manganese salt, and ferrous salt are mixed to obtain remediation agent B. Remediation agents A and B must be stored separately and mixed immediately before remediation. Remediation agents A and B are dispersed in water, and the remediation microbial agent is added to obtain a remediation agent suspension. The remediation agent suspension is immediately applied to the acidic soil to be remediated for simultaneous remediation of pesticide and arsenic pollution. According to experiments, after remediation using the method provided by this invention, glyphosate in the soil is effectively degraded, arsenic is effectively oxidized and passivated, and the soil pH value is raised to neutral, achieving the goal of pollutant removal and soil restoration to health.

A method for producing a catalyst comprising a group VIB metal and / or a group VIII metal and an oxide support, characterized in that said method comprises recycling the group VIB and / or group VIII metals from a source catalyst containing a metal shared with the catalyst to be produced, said source catalyst being contaminated with coke, vanadium and arsenic, the method comprising: - a regeneration, then - extracting the vanadium with an extraction solution containing an alcohol, then - extracting the group VIB and / or group VIII metal or metals with an extraction solution comprising an organic compound having complexing properties, then - impregnating the support with an impregnation solution obtained from the solution of extracted group VIII and / or group VIB metal / metals, the extracted metal(s) remaining in the liquid phase from the extraction with an extraction solution containing an alcohol until the impregnation.

The invention discloses a preparation method of hydroxyl-containing titanium carbide MXene, electrochemical etching and light induction are adopted in the preparation method, the preparation method is simple and environmentally friendly, and the hydroxyl-containing titanium carbide MXene prepared through the preparation method is good in dispersity in water and has good catalytic oxidation activity and excellent adsorption capacity. The hydroxyl-containing titanium carbide MXene provided by the invention can be used as a photocatalyst for removing arsenic pollutants in water.