32 results about "Chromium contamination" patented technology

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 present application relates to the technical field of groundwater pollution remediation, and particularly relates to a method and device for in-situ remediation of hexavalent chromium contaminated groundwater, wherein the device comprises a multifunctional well group, a medicament supply system, an aeration system, a monitoring system and a control system; the multifunctional well group comprises a plurality of multifunctional wells; the medicament supply system is used for pretreating medicaments, modified composite reducing agents and composite functional bacteria liquid respectively; the control system is used for receiving monitoring data; the control system is also used for displaying monitoring data and equipment operating states, and setting operating parameters by a user; the control system is also used for automatically adjusting medicament dosing amount, aeration flow and aeration pressure according to monitoring data and operating parameters set by the user. Through the design of the multifunctional well group, the medicament supply system and the aeration system, the hexavalent chromium contaminated groundwater can be simultaneously subjected to chemical reduction, biological reinforcement and adsorption fixation, so that the three processes are coordinated to realize rapid, efficient and long-acting remediation of the hexavalent chromium contaminated groundwater.

The invention provides a chromium-polluted aquifer in-situ layered injection remediation method based on a response curved surface. The method comprises the following steps that a prediction model is constructed based on a response curved surface method, optimal agent parameters are predicted, pilot test verification is conducted based on the predicted optimal agent parameters, and the optimal pilot test agent injection amount is determined; establishing a relational expression between the agent injection concentration and the initial concentration of the underground water Cr (VI) based on the theoretical agent dosage, the adsorption capacity of the water-containing medium to the agent and the model prediction result; the optimal pilot plant test agent injection amount is the total injection amount of all the injection points, and according to the relational expression, the agent injection concentration of all the injection points in the chromium pollution site is determined. The method disclosed by the invention can be used for accurately regulating and controlling medicament parameters in actual engineering application, improving the remediation efficiency, shortening the construction period and saving the capital cost, fully remedying the chromium-polluted aquifer and reducing the risk of'yellowing 'of underground water in the later period, and is suitable for in-situ remediation construction application of the large-scale polluted aquifer.

The present application relates to the technical field of pollution detection, in particular to a water body heavy metal chromium pollution detection method and system, the method comprising the following steps: obtaining the concentration of water body dissolved organic matter, hydrogen ion concentration, oxidation-reduction potential, temperature and initial hexavalent chromium concentration and normalizing, determining the reduction reaction rate constant according to the temperature and oxidation-reduction potential, predicting the reduction rate of hexavalent chromium, the theoretical reduction amount and the theoretical residual concentration, collecting the online electrochemical concentration and the unmanned aerial vehicle hyperspectral inversion concentration and performing difference verification, respectively correcting the electrochemical concentration and the hyperspectral concentration when there is data contradiction, and fusing the two types of correction results to judge the pollution state. In the present application, by establishing a hexavalent chromium natural evolution reference and combining multi-source observation consistency verification, the electrochemical underestimation caused by organic matter passivation and the hyperspectral overestimation caused by spectral background are identified, compensation correction and background stripping are completed, and the accuracy and reliability of chromium pollution detection in complex water bodies are improved.

The application provides a chromium-contaminated laterite soil repairing agent and a repairing method thereof, and the method realizes effective repair of the laterite soil through the steps of pretreating the soil, applying the repairing agent I and applying an electric field, adding the repairing agent II for maintenance, and finally connecting biological strains.The method comprises the following steps: removing sundries, plowing the soil, applying the repairing agent I containing a reducing agent, citric acid and other components, and treating under specific electric field conditions.Subsequently, the repairing agent II, such as organic fertilizer, iron oxide, nano zeolite and chitosan derivative, is added.Finally, specific proportions of aspergillus, citrobacter freundii and psychrobacter are connected for biological repair.The method comprehensively considers physical, chemical and biological repair means, aims to efficiently remove chromium pollution in the soil, improve the soil organic carbon content of the laterite soil, and restore the ecological function of the soil.

This invention belongs to the field of soil and rock mass pollution remediation technology, and discloses a remediation system and method for hexavalent chromium contaminated soil / fractured rock mass, including a heating unit, a temperature monitoring unit, and a ground barrier unit. The heating unit includes an energy supply system and a heating well, with the energy supply system and the heating well sealed together, using heat conduction heating to heat the soil and fractured rock mass in situ. The temperature monitoring unit includes temperature sensors and monitoring wells, with the temperature sensors spaced along the depth direction of the monitoring wells. The temperature monitoring unit enables real-time temperature monitoring and feeds the data back to the energy supply system. The ground barrier unit is a concrete layer that insulates and seals the surface of the remediation area, preventing heat loss and air ingress into the soil. This invention solves the technical problems of difficult mass transfer of reducing agents, unstable remediation effects, and high difficulty in remediating fractured bedrock in traditional in-situ remediation technologies for Cr(VI) pollution.

The invention discloses a hexavalent chromium polluted underground water green remediation system and application. The hexavalent chromium polluted underground water green remediation system comprises a remediation well body and a non-contact sustainable electron injection system arranged in the remediation well body. The repair well main body comprises a shaft and a through hole formed in the wall of the shaft; the non-contact sustainable electron injection system comprises a medicament chamber and a graphite cathode plate; the medicament chamber is a closed space enclosed by a proton exchange membrane and a sealing plug, and a graphite anode plate and a sodium dithionite solution are accommodated in the medicament chamber; the graphite cathode plate is electrically connected with the graphite anode plate; according to the non-contact sustainable electron injection hexavalent chromium polluted underground water green remediation method, a reducing agent does not need to be added into a water-containing layer, the secondary pollution risk caused by the reducing agent and a product thereof is avoided, and green and efficient hexavalent chromium underground water remediation is achieved.

The present application relates to water remediation technical field, especially to a kind of groundwater remediation equipment and system for chromium pollutant.Its technical scheme includes: adsorption conversion piece, the adsorption conversion piece includes track, rack, gear, winding shaft and adsorption thick piece, the track is set four, is evenly fixedly installed in the top inner wall and bottom inner wall of magnetic adsorption tank respectively, the track adopts curved U-shaped structure, the inner wall of the track is slidably connected winding shaft.The present application is moved along track by gear and rack cooperation, so that winding shaft and adsorption thick piece move, when adsorption thick piece moves from the inner curved portion of track to outer curved portion, the contact surface of adsorption thick piece with water is converted, so that both sides of adsorption thick piece can contact with groundwater, avoid that the particle filling of adsorption thick piece inside is too thick, lead to that the particle of one side of adsorption thick piece is saturated to be absorbed chromium, and the other side is not absorbed to chromium, conversion absorption surface, improve absorption amount.

This application relates to the field of hexavalent chromium contaminated soil remediation, specifically disclosing a hexavalent chromium contaminated soil remediation agent. Taking 100 kg of hexavalent chromium contaminated soil as an example, it comprises the following raw materials in the following amounts: molasses: 10-50 kg; vinegar residue wastewater: 10-50 kg; modified nano-iron: 5-15 kg; the pH value of the vinegar residue wastewater is 2-3. The remediation agent of this application can more quickly and thoroughly reduce hexavalent chromium in the soil, improving the remediation effect.

The present application relates to waste disposal technical field, especially to a kind of processing method for treating chromium-containing contaminated soil by synergistically disposing waste desulfurization residue and waste organic solvent, comprising the following steps: step one, the chromium-containing contaminated soil is broken, after processing, spray a certain proportion of waste organic solvent and water, ensure that the moisture content is 30-50%, obtain mixture A;Step two, a certain amount of catalyst is added to mixture A to catalyze the reaction, stir evenly, obtain mixture B;Step three, waste desulfurization residue is added to mixture B, stir evenly, obtain mixture C.In the present application, a kind of harmless treatment method for chromium-containing contaminated soil is provided, realizes detoxification while chromium-containing contaminated soil is used as another detoxification agent, waste is turned into treasure, reaches the effect of waste pollution control, while simplifying operation process, reduces processing cost, improves economic benefit, meets landfill standard and becomes the problem that the present technical personnel in the field urgently need to solve.

The invention relates to the technical field of planting, and discloses a root system protection and chromium enrichment strengthening device and method for plant planting in chromium-contaminated soil, the structure of the root system protection and chromium enrichment strengthening device comprises a planting fixing device, a root system isolation device and a chromium enrichment device.According to the root system protection and chromium enrichment strengthening device, the three functions of physical planting fixing, root system isolation protection and repair strengthening of plants are integrated; in addition, by means of the rough filtration layer, the adsorption conversion layer and the slow release layer with the selective blocking function, a protection barrier can be arranged between the plant root system and the chromium-contaminated soil, so that the initial chromium exposure concentration of the root system is reduced, and the survival rate and the early growth speed of seedlings are remarkably increased; the lower expansion ring is arranged on the planting fixing device, and the diameter of the lower expansion ring can be adjusted by means of angle rotation of the clamping seat on the universal ball, so that the device is suitable for planting and fixing plants with different root system sizes.

The application discloses a steel slag conversion method for total chromium removal, and belongs to the field of functional materials. The steel slag is subjected to water bath treatment in an alcohol-water mixed solvent by using an organic carboxylic acid, then the obtained powder is dispersed in water, the suspension is adjusted to an alkaline pH of 8-11, and then a phosphate is added to perform a heating reaction in a water bath. In the application, by controlling the reaction conditions, the elements such as Fe and Ca rich in the steel slag can be effectively utilized, the iron ions in the steel slag are converted into carboxylic acid complexes, and the calcium ions are converted into calcium hydroxyphosphates, so that the illumination reduction of Cr(Ⅵ) and the adsorption and fixation of Cr(III) products are realized respectively, and the purpose of effectively removing chromium is achieved. Therefore, the application not only realizes the effective utilization of the steel slag solid waste, but also realizes the removal of chromium pollutants in sewage, and has good economic value and environmental effect.

The application discloses a kind of stabilized reducing iron sulfur-based slurry and its preparation method and application, the slurry is organic matter-coagulant-ferrous sulfide nanoparticle suspension, including the following components by mass percentage concentration: the slurry includes the following components by mass percentage concentration: organic matter: 0.5-5%, coagulant: 1-10%, ferrous sulfide nanoparticles: balance.It is prepared as follows: organic matter solution is mixed with ferrous sulfate solution and stirred, then mixed with coagulant solution and stirred, then slowly drop sodium sulfide solution, stirring, so that nano ferrous sulfide particles are formed in mixed solution, then centrifuged, and the supernatant is discarded to obtain the slurry.The slurry of the application can be prepared in a short process and at a low cost, can efficiently and quickly treat hexavalent chromium contaminated water, can be stored at normal temperature and pressure for at least one month without deterioration, has a small dosage, the precipitate after treatment is stable, avoids secondary pollution, and has potential application value.

The application relates to the technical field of planting, and discloses a root protection and chromium enrichment strengthening device and method for plant planting in chromium-polluted soil, which comprises a planting fixing device, a root isolation device and a chromium enrichment device. The three functions of physical planting fixation, root isolation protection and repair strengthening of plants are integrated in one body, the survival rate of chromium enrichment plant planting is improved, and with the help of a coarse filtration layer, an adsorption conversion layer and a slow-release layer with selective barrier function, a protective barrier can be established between the plant roots and the chromium-polluted soil, so that the initial chromium exposure concentration of the roots is reduced, the survival rate of seedlings and the early growth speed are significantly improved, and a lower expansion ring is arranged on the planting fixing device, the angle of the lower expansion ring on the universal ball can be adjusted through the angle rotation of the clamping seat, and the planting fixation of plants with different root sizes can be realized.

The invention belongs to the technical field of sewage treatment, and particularly relates to a combined remediation method for underground water polluted by high-concentration hexavalent chromium. A combined remediation method for underground water polluted by high-concentration hexavalent chromium comprises the following steps that the underground water polluted by the high-concentration hexavalent chromium is pumped out to ground surface sewage treatment equipment, and chemical reduction, alkaline water adjustment and precipitation and flocculation sand filtration and carbon filtration treatment are adopted; a reducing agent is injected into the extracted underground water pollution area, and hexavalent chromium is converted into trivalent chromium with relatively low toxicity; and the concentration of hexavalent chromium in the underground water is monitored regularly, a reducing agent is supplemented and injected in a substandard area, and finally the concentration of hexavalent chromium in the underground water reaches the remediation target. According to the method, the high-concentration hexavalent chromium polluted groundwater extraction treatment technology and the low-concentration hexavalent chromium polluted groundwater in-situ chemical reduction remediation technology are combined, the dosage of a reducing agent is greatly reduced, the groundwater remediation cost is reduced, meanwhile, the pollution remediation period is shortened, and good economic benefits are achieved.

The present application relates to the technical field of metal smelting, and particularly relates to a method for reducing hexavalent chromium in chromium-contaminated soil or chromium residue. The method comprises the following steps: S1, crushing the chromium-contaminated soil or the chromium residue, mixing the chromium-contaminated soil or the chromium residue with a detoxifying agent and water, and then feeding the mixture into a stirring tank to obtain slurry 1; S2, feeding the slurry 1 into a mechano-chemical reactor to perform mechano-chemical treatment for 5-60 min to obtain slurry 2; and S3, feeding the slurry 2 into a high-pressure filter to perform pressure filtration to obtain a filter cake and pressure filtrate; the filter cake is scattered by a silt machine and stored for aging, and the completely detoxified chromium-contaminated soil or chromium residue is obtained after the aging is completed. The present application realizes long-term removal of hexavalent chromium in high-concentration chromium-contaminated soil or chromium residue through high-concentration mechano-chemical treatment of the chromium-contaminated soil or the chromium residue and a specific compound detoxifying agent, and then through an aging reaction, and the detoxified product has no risk of resolubilization.

The application discloses a kind of septal inflammation pseudomonas LH-Cr-2, belong to microbial technical field.The biological preservation number of septal inflammation pseudomonas LH-Cr-2 is CGMCC NO.27552.The application also discloses the fermentation culture method of septal inflammation pseudomonas LH-Cr-2 for use as a way.The septal inflammation pseudomonas LH-Cr-2 of the application can efficiently reduce different concentrations of soluble hexavalent chromium, provides experimental technology and theoretical basis for the application of microbial reduction technology in chromium-contaminated soil remediation.Six valence chromium is efficiently reduced, and in-situ remediation of chromium-contaminated soil or groundwater can be applied, and can also be used in other related fields that can solve problems by reducing hexavalent chromium.

The application discloses a remediation agent for high-concentration hexavalent chromium contaminated soil and a preparation method and a remediation method thereof, and belongs to the technical field of soil pollution remediation. The remediation agent for high-concentration hexavalent chromium contaminated soil comprises an acid precursor, an iron-sulfur reducing agent and a synergist; the acid precursor comprises an organic acid and alginate propylene glycol ester; the iron-sulfur reducing agent comprises an iron-based reducing agent and a sulfur-based reducing agent; and the synergist comprises sophorolipid and alkyl glucoside. The remediation agent can be used for high-concentration hexavalent chromium contaminated soil, can replace hexavalent chromium in the soil as much as possible to expose Cr 6+ in the form of ions, and then convert the Cr into trivalent chromium by using a reducing agent, so that the removal efficiency of hexavalent chromium is as high as 99.6%. In addition, the soil remediation agent is simple to use, and has rapid and thorough reaction and long-lasting effect.

The invention relates to the technical field of environmental pollution remediation, in particular to a chromium pollution site pumping-injecting combined remediation system and method based on underground water power regulation and control. The method includes: surveying and paying off an engineering area to determine an engineering area repair range; carrying out underground water pumping-treatment; and in-situ injection repairing and regular monitoring of underground water are carried out. According to the method disclosed by the invention, the injected reducing agent is in full contact with residual Cr (VI) in the aquifer and is subjected to oxidation-reduction reaction through a hydrodynamic regulation effect, so that the Cr (VI) is converted into Cr (III), and the use amount of a chemical reagent is effectively reduced; meanwhile, by utilizing the alkaline condition of the underground water environment, Cr (III) is promoted to form precipitates with high stability and weak mobility, so that the residual quantity of Cr (VI) in water is further reduced, and a secondary diffusion path of chromium pollution can be blocked; the problems that in the prior art, the concentration of Cr (VI) in underground water is reduced slowly, and the trailing phenomenon is remarkable are solved.

The invention discloses a biomimetic reduction remediation method for stable hexavalent chromium in chromium-contaminated soil, and belongs to the technical field of chromium-contaminated soil remediation. Aiming at the core problems that the form of hexavalent chromium is neglected and a stable-state hexavalent chromium reduction method is lacked in the existing chromium-polluted soil remediation technology, the method is based on analysis on the form of hexavalent chromium in soil and according to the structure of stable-state hexavalent chromium, hydrated iron oxide in soil is efficiently dissolved and destroyed by adopting an oxalic acid solution under a heating condition, and the stable-state hexavalent chromium in the soil is recovered. The stable-state hexavalent chromium adsorbed on the hexavalent chromium is forced to be released and then is reduced by an oxalic acid solution, and meanwhile, hexavalent chromium in other forms is also reduced together. According to the method, the biological process that plant root systems secrete oxalic acid to dissolve hydrated iron oxide to release stable-state phosphate radicals is simulated, and the content of hexavalent chromium in the reduced soil can be reduced to be lower than a standard limit value. The method is suitable for remediation of chromium-contaminated soil with different textures such as sandy soil, loam and clay, and the adopted oxalic acid compound is an environment-friendly medicament.

The utility model discloses a device for repairing chromium-polluted soil and / or underground water by electrochemically strengthening minerals. The device comprises a power supply, an on-line monitoring control system, an electrode unit and a mineral material, the power supply provides energy for device operation; the on-line monitoring control system is used for monitoring the temperature and humidity, the pH value, the oxidation-reduction potential and the change of current and voltage of the surrounding environment of the electrode unit and adjusting the current and voltage output to the electrode unit; the electrode unit consists of an electrode, a carrier and an electrode sleeve, and is arranged in chromium-contaminated soil and / or underground water; and the mineral material has hexavalent chromium reducing capacity and fixing capacity, and is filled outside the electrode unit sleeve and at the bottom of the carrier and / or used as an electrode coating. According to the device, chromium-containing pollutants are electrically driven to migrate and reduce, and the reduction and fixation of chromium by minerals are strengthened, so that the device is simple and convenient to operate, green and safe, chromium-polluted soil and underground water can be effectively treated, and the problems of high energy consumption, secondary pollution, soil degradation and the like in the traditional remediation technology are solved.

This invention discloses a method and microbial agents for remediating chromium-contaminated soil using livestock and poultry manure and agricultural and forestry waste, belonging to the field of chromium pollution control technology. The method includes: uniformly mixing livestock and poultry manure and agricultural and forestry waste, adding a No. 1 microbial agent for aerobic composting; after composting, mixing the compost product with the chromium-contaminated soil, adding a No. 2 microbial agent and sodium lactate for remediation, and then proceeding until remediation is complete. Both the No. 1 and No. 2 microbial agents used in this invention are composed of multiple microorganisms, and the No. 2 agent loads suitable microbial strains onto biochar to form small spherical microbial agents, which can effectively reduce and fix chromium, ensuring the long-term safety of the remediated soil. The microbial agents used have advantages such as high efficiency, environmental friendliness, and readily available materials.

The invention discloses a performance evaluation method for repairing chromium-polluted soil by using a micro-nano iron-based reducing material. The method comprises the following steps: S1, obtaining performance parameters: obtaining material repairing activity parameters and repairing long-term performance parameters of the micro-nano iron-based reducing material through a characterization test means; chromium pollution degree parameters and soil property parameters of target soil are obtained through a soil detection means; s2, establishing a correlation model: constructing a quantitative structure-activity relationship model between the performance parameters and the soil chromium reduction efficiency based on a machine learning or Meta analysis method; s3, determining an evaluation benchmark: according to the quantitative structure-activity relationship model, determining the weight and the scoring benchmark of each index for evaluating the material performance; s4, comprehensive evaluation is carried out, wherein the performance parameters of the to-be-evaluated material and the target soil are input into the evaluation benchmark, and a comprehensive performance score is obtained through calculation.

The invention discloses a soil heavy metal chromium pollution evaluation method and system based on sensor data, and relates to the technical field of soil heavy metal detection. Selecting one sensor from the chromium ion sensor cluster as a target sensor; according to the sensor position information, the chromium ion concentration value of the position where the target sensor is located is calculated; spatial calculation is conducted on the multiple chromium ion concentration values, and chromium pollution diffusion distribution information is generated; according to the chromium pollution diffusion distribution information, chromium pollution evaluation is carried out, and a chromium pollution evaluation result is obtained. According to the method, the diffusion distribution information can be generated by calculating the chromium ion concentration value, so that chromium pollution evaluation is realized, and the accuracy and food safety are improved.

The invention discloses a method for repairing chromium-contaminated soil through cooperation of microorganisms and natural iron-containing minerals, and the method comprises the following steps: mixing the natural iron-containing minerals into the chromium-contaminated soil, standing for several days, then adding mixed bacteria into the obtained system, standing for a reduction reaction, reducing high-valence iron and high-valence sulfur in the system into ferrous iron and ferrous sulfur, and then removing the ferrous iron and the ferrous sulfur in the system. A low oxidation-reduction potential environment is formed in the system; the method comprises the following steps: adding chromium reducing bacteria into a system in a low oxidation-reduction potential environment, standing and reducing hexavalent chromium to obtain trivalent chromium, and carrying out mineralization reaction on the trivalent chromium and ferrous iron to obtain a chromite-like product, thereby realizing the remediation of the chromium-polluted soil. According to the method provided by the invention, the natural iron-containing minerals, the mixed bacteria and the chromium reducing bacteria synergistically reduce and mineralize the hexavalent chromium, mineralization stable repair of the hexavalent chromium is realized, the problems of instability, easy re-dissolution and re-pollution and the like of a chromium product after traditional repair are solved, and the method has the advantages of short repair period, low construction cost and long-acting and stable effect, and is suitable for large-scale popularization and application. And the problem of secondary pollution in the treatment process is avoided.

The utility model discloses a chromium-containing sewage treatment device for a hospital test room, and particularly relates to the technical field of chromium-containing sewage treatment, which comprises an adjusting tank, an equipment room is arranged on one side of the adjusting tank, a reaction tank is arranged on the other side of the adjusting tank, and a coagulative precipitation tank is arranged on one side of the reaction tank. A PAC adding device, a PAM adding device, an automatic acid adding device, an automatic alkali adding device and a ferrous sulfate adding device are respectively arranged in the equipment room, and a pH display, an ORP display, an electromagnetic air pump and a PLC control system are also arranged in the equipment room. According to the utility model, a plurality of treatment units such as an adjusting unit, a reaction unit and a coagulating sedimentation unit are integrated, and the PLC control system is combined to realize accurate automatic control, so that chromium pollutants in sewage are effectively removed, the effluent quality is ensured to reach the standard, and meanwhile, the treatment efficiency and the stability are improved.

The invention discloses a treatment method of a hexavalent chromium polluted solid material and application of the treatment method, and belongs to the technical field of environmental engineering. The method provides a green and efficient microwave enhanced repairing scheme. The method comprises the following steps: fully mixing the hexavalent chromium polluted soil with a reducing material and a low-molecular-weight organic acid solution to form a to-be-repaired mixture; and then the mixed material is subjected to microwave irradiation treatment, and rapid and deep repairing is completed. Release of indissolvable hexavalent chromium is promoted through protonation and complexation of the organic acid, meanwhile, by means of the local hot spot effect generated on the surface of the wave-absorbing reduction material through microwaves, the selectivity and reducing capacity of the reduction material on hexavalent chromium are remarkably improved, cooperation of the microwaves, the organic acid and the reduction material is achieved, and the reduction effect of hexavalent chromium is improved. The method has the remarkable advantages of being high in remediation speed, good in reduction effect and the like, and is particularly suitable for treatment of high-concentration contaminated soil containing insoluble hexavalent chromium compounds and industrial waste residues.

The application provides a multistage leaching system and method for hexavalent chromium contaminated soil leaching repair, and belongs to the technical field of multistage leaching methods. The multistage leaching system and method for hexavalent chromium contaminated soil leaching repair comprises a leaching unit including a leaching tank body, a porous spray pipe network arranged at the bottom of the leaching tank body, and a MOF-based leaching agent storage tank connected with the porous spray pipe network through an acid and alkali resistant pipeline. The MOF-based leaching agent storage tank stores a composite leaching agent. A filtering unit includes a MOF@activated carbon composite column, and the inlet of the MOF@activated carbon composite column is connected with a flow guide groove through a pipeline. A regeneration unit includes a hydrochloric acid elution tank and a regeneration liquid storage tank, and the regeneration liquid storage tank is connected with the backwashing inlet of the MOF@activated carbon composite column through a pipeline. The regeneration liquid storage tank is communicated with the MOF-based leaching agent storage tank through a pipeline. A fluid driving assembly includes a peristaltic pump and a manual valve arranged on the pipeline, and solves the problems of low repair efficiency and high secondary pollution risk existing in traditional leaching repair technology.

The invention provides a preparation method and application of kilogram-level iron modified biochar. The preparation method comprises the following steps: mixing biomass (or biochar prepared by cracking the biomass at 700-800 DEG C) such as wood chips, mushroom dregs or rice husks and the like with ferrous sulfate according to a mass ratio of 1: (4-6), and calcining at 700-800 DEG C for 1-1.5 hours to prepare kilogram-level iron-based biochar or magnetic biochar. The process is simple and efficient, wastes are used as raw materials, and the large-scale production cost is greatly reduced; the highest specific surface area of the iron-modified biochar is 20.2 m < 2 > / g, the highest saturation magnetization is 10 emu / g, and the iron-modified biochar has the advantages of efficient adsorption and easiness in magnetic separation and recovery; when high-concentration chromium-containing wastewater (the pH adaptation range is 4-11) and chromium-polluted soil are treated, reduction of Cr (VI) can be promoted through the weak acid environment of the material, the adsorption-reduction process is achieved, and an economic solution is provided for heavy metal pollution treatment. The energy consumption is reduced, the method is suitable for kilogram-level continuous production, efficient carbonization of agricultural and forestry waste and synchronous treatment of heavy metal pollution can be achieved, and the concept of treating waste with waste is met.

The application provides a method for repairing chromium-polluted soil by immobilized Acinetobacter venetianus combined with electro-osmosis. 600 S1: preparing double-pore-size structure glassy carbon particles; S2: preparing an Acinetobacter venetianus suspension with OD=0.8; S3: immobilizing the Acinetobacter venetianus; S4: soil repair test; and S5: sampling and determining the chromium ion removal effect. The double-pore-size structure glassy carbon particles have the advantages of high mechanical strength and stable chemical properties, and are convenient for repeated use. The pores distributed on the double-pore-size structure glassy carbon particles have a pore size of 4+ / -1 nm and 40+ / -3 nm. The double-pore-size structure can greatly reduce the mass transfer resistance, and has a large specific surface area and high porosity. After electro-osmosis, chromium ions are gathered at the cathode, and the structure can easily flow through the chromium ions and increase the adsorption of the chromium ions.