6124results about "Contaminated soil reclamation" patented technology

The invention relates to the technical field of water source pollution investigation, and particularly discloses a soil groundwater pollution fine investigation method which comprises the steps of S1, pollution source investigation, S2, sampling design, S3, laboratory analysis, S4, ecological risk assessment, S5, restoration suggestion and S6, dynamic monitoring. According to the invention, through machine learning and big data analysis, historical pollution data, field sampling data and spatial geographic information can be effectively integrated to form an accurate pollution source distribution map, which not only facilitates identification of pollution hot spot areas, but also can predict the pollutant diffusion trend through a data-driven model to provide dynamic prediction of future pollution evolution; according to the method, high-precision positioning of a complex pollution area is realized, blind sampling and invalid investigation are reduced, the resource utilization efficiency is improved, the area where pollutants are possibly diffused in the future can be predicted, prevention and control measures are taken in advance, and further environmental damage is avoided.

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 discloses a salt and alkali tolerant phosphate-solubilizing growth-promoting bacterium and application thereof, and belongs to the technical field of biology, the salt and alkali tolerant phosphate-solubilizing growth-promoting bacterium is named as Enterobacter hormaechei P03 and preserved in the China Center for Type Culture Collection (CCTCC), and the preservation number is CCTCC No: M 20242250. The enterobacter hormaechei P03 provided by the invention has good salt resistance, acid and alkali resistance, growth promotion and phosphate solubilizing effects, grows well under high salinity, acidic conditions and alkaline conditions, has better phosphate solubilizing capacity, and can generate indoleacetic acid in the growth process to promote plant growth.

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 belongs to the technical field of microorganisms, particularly relates to rice endophytic bacillus velezensis AN6 and application thereof, and particularly provides bacillus velezensis AN6 which is classified and named as bacillus velezensis and has the preservation number of CCTCC (China Center for Type Culture Collection) NO: M 20231886. The invention provides a novel rice endophytic bacillus velezensis strain AN6, through separation, screening, identification and experimental verification, it is found that the strain shows broad-spectrum resistance to various phytopathogens including rice bacterial leaf blight, rice blast and the like, the strain has the capacity of inhibiting various phytopathogens and has the capacity of adsorbing heavy metal, and the strain has the advantages of being capable of inhibiting various phytopathogens and capable of being used as a novel rice endophytic bacillus velezensis strain AN6. The method is of great significance to biological control of rice diseases and development of green agriculture.

The invention discloses a coal-based solid waste ecological restoration material and a preparation method thereof. The preparation method comprises the following steps: mixing coal gangue powder with a cementing material, a mineral activator and a physical pore-forming foam body, and curing to prepare a porous sandy soil matrix; and uniformly mixing the prepared porous sandy soil matrix with coal slime and a complex microbial inoculant, and performing fermentation and precipitation to obtain the coal-based solid waste ecological restoration material. Due to the addition of the cementing material, the strength of a sandy soil matrix framework is enhanced, collapse of pore channels in the crushing process is reduced, and the water retention and air permeability of the material are improved. Compared with traditional aluminum powder chemical foaming and strong acid foaming, the physical foaming technology adopted by the invention improves the operation safety while reducing the cost, and facilitates standardized production. Nutrient elements in the ecological restoration material can be fully released through the activation effect of the bacterium-fungus complex microbial inoculant. The ecological restoration material can be applied to environmental restoration fields such as mine soil restoration and land reclamation.

The invention provides an accurate transportation control method and system for a remediation agent for in-situ remediation of underground water, and relates to the technical field of underground water pollution remediation, and the method comprises the steps: collecting an image of a drilling rock core of a polluted site and sensor data, extracting features through a visual attention network and a time sequence attention network, and carrying out the feature extraction; the features are input into a conditional probability diffusion model and fused to generate hydrogeologic feature vectors, a high-precision hydrogeologic feature model is constructed in combination with space attention mapping and a generative diffusion model, the high-precision hydrogeologic feature model is input into a multi-region collaborative simulation environment for optimization calculation, and monitoring data are fused through edge calculation nodes. And training the lightweight control model to execute repair medicament transport control.

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

The invention discloses a microbial compound fertilizer for improving soil pollution, which is prepared by mixing a matrix fertilizer, alginic acid, cellulase, modified bentonite, biochar, a microbial agent, nano zero-valent iron and monopotassium phosphate according to a mass ratio of (30-40): (6-10): (5-8): (20-25): (15-20): (3-5): (4-6): (4-8), the microbial agent comprises pseudomonas, bacillus and silicate bacteria; heavy metal ions in soil can be effectively neutralized through the nanoscale zero-valent iron and the phosphate, pollutants in the soil can be effectively degraded through the microbial flora, meanwhile, nutrients needed by plant growth are provided, the modified bentonite is added, the soil structure can be changed, meanwhile, phosphorus and potassium fertilizers are provided for the soil, and the soil quality is improved. By adding alginic acid and cellulase, the activity of microorganisms is effectively enhanced, the fertility conversion efficiency of the microorganisms is improved, and soil improvement and remediation are achieved.

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

The invention discloses 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 an ionic type rare earth tailing restoration method, and relates to the technical field of environment restoration. Through soil improvement, local dominant plant planting and rhizosphere growth-promoting bacteria reinforcement, the heavy metal content, acidity and soil fertility of the rare earth tailing area are improved, soil with reduced heavy metal content, reduced acidity and increased fertility is obtained, continuous growth of arbor-shrub-grass three-layer dominant plants on the rare earth tailing area is promoted, and the yield of the arbor-shrub-grass three-layer dominant plants is increased. And finally, effective repair of the rare earth tailings is realized.

To provide a technology that balances increased food production and control of environmental pollution that can cope with the increasing population.SOLUTION: After the agrochemicals used on the crops fulfilled their function, the ascomycetes white wood-rotting fungus having the characteristics of mycorrhizal fungus is used to decompose the agrochemicals remaining on the crops and soil.SELECTED DRAWING: Figure 4

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 discloses a soil groundwater remediation agent injection device and method.The device is arranged in an excavated soil layer hole and comprises a flexible air bag, the flexible air bag further comprises an air bag body, the upper end and the lower end of the air bag body are made of hard materials, and the wall face of the air bag body is made of flexible materials; a pipeline penetrates between the upper end and the lower end in a sealed manner and is used for accommodating a medicine injection pipeline, an inflation pipeline and an air pressure monitoring line; the injector is arranged on the outer side of the flexible wall surface of the air bag body and is communicated with the medicine injection pipeline; the whole injector is arc-shaped or annular, the inner side of the injector is attached to the flexible wall surface, and medicament injection holes are uniformly formed in the outer side of the injector; after the air bag body is inflated and expanded, in the medicament injection process, the injector abuts against the height position of the soil layer to be repaired, and the flexible wall face is tightly attached to the wall face of the hole. According to the device, injection repairing work of the medicament at different depths can be rapidly achieved only by drilling a proper simple hole underground, and recycling of the medicament injection device can be achieved.

The invention discloses a mud flat-derived malathion degrading bacterium and application thereof, and relates to the technical field of biology. The malathion degrading bacterium is Ectopseudomonas khazarica FJ5-34-2, and is preserved in the China General Microbiological Culture Collection Center on November 8, 2024, the preservation address is No.3, No.1 yard, Beichen West Road, Chaoyang District, Beijing, and the preservation number is CGMCC No.32547. The malathion degrading bacterium has the advantages that the malathion degrading bacterium can be used for degrading malathion; according to the invention, an in-vitro pseudomonas strain FJ5-34-2 is screened from a mud flat sample in a new area of Northern Daihe River in Qinhuangdao, Hebei province. The in-vitro pseudomonas can effectively degrade malathion, and the degradation rate of 100 mg / L malathion within 72 hours can reach 94.93%. The invention provides a new effective microorganism for microbial degradation of malathion, which has great practical significance for relieving environmental residues of pesticides.

According to the method disclosed by the invention, arbuscular mycorrhizal fungi and biochar are added while multiple-leaf goldenrain trees are planted in cadmium-polluted soil. Compared with a traditional remediation mode of independently utilizing plants or microorganisms or biochar, the microorganism-plant-biochar combined remediation has the advantages that the plants, the microorganisms and the biochar are co-cultured to form a symbiotic system, so that the cadmium content in the soil is remarkably reduced, the remediation capacity of the plants is enhanced, and meanwhile, the growth of the plants is remarkably improved. The strategy breaks through the limitation that in the prior art, only improvement of plant resistance is concerned, and the strategy more focuses on the double effects of improving the phytoremediation capacity and promoting the growth effect, so that the maximization of the phytoremediation effect is achieved.

The invention relates to the field of saline-alkali soil remediation, and particularly discloses a saline-alkali soil improvement and remediation method which comprises the following steps: step 1, soil pretreatment: performing deep scarification operation on saline-alkali soil at the depth of 40-60cm, and applying desulfurized gypsum particles with the particle size of less than or equal to 5mm at the dosage of 3-5t / ha; step 2, paving a biochar-based composite material: mixing biochar, humic acid and nano-hydroxyapatite according to a mass ratio of 4: 1: 0.5 to form composite particles with the particle size of less than or equal to 2mm, and burying the composite particles into soil in a layered manner according to the dosage of 8-12t / ha; through physical and chemical regulation and control of the biochar-based composite material, biological metabolism activation of the composite microbial agent and dynamic optimization of intelligent water and salt management, a cascade remediation system of material salt resistance-microbial soil improvement-plant salt absorption is constructed, all technical modules are mutually coupled, the salt reduction efficiency is remarkably improved, and the comprehensive utilization rate of the biochar-based composite material is increased. Meanwhile, the soil nutrient circulation capacity is enhanced, and the problems that a traditional single technology is limited in action range and long in remediation period are solved.

The invention relates to the technical field of soil remediation management, in particular to a method and system for soil remediation and digital management, and the method comprises the steps: data construction: fusing multi-source monitoring soil environment parameters with space-time background data such as a GIS layer and a meteorological time sequence to form a data set; state quantification: outputting a comprehensive state index for quantifying restoration urgency and complexity through the soil health assessment model; scheme generation: matching the restoration target library and the resource library, and generating a digital restoration scheme containing an expected state trajectory through an optimization algorithm; closed-loop control is carried out, feedback data comparison tracks are continuously collected, if the deviation exceeds a threshold value, the index is recalculated, the scheme is dynamically adjusted, and the system comprises a data construction module, a state quantification module, a scheme generation module and a closed-loop control module and executes the method. According to the method, the data reliability and evaluation scientificity are improved, the scheme adaptability is guaranteed, dynamic and controllable remediation is realized, and digital and efficient management of soil remediation is promoted.

The remediation method for the moderately and severely cadmium-polluted rice field aims at strictly controlled cadmium-polluted rice fields, and is divided into two stages of strict control and safe utilization for remediation. In the strict management and control stage, an activating agent is applied to the soil in spring, then microalgae are inoculated, cadmium-enriched plants are planted, the plants are collected after being full of the microalgae, the plants are harvested when the plants grow to the enrichment extreme value, stubbles are reserved for growth, and the steps are repeated till winter; applying an activating agent in winter, planting green manure, and harvesting in spring in the next year; the process is cyclically carried out until the cadmium content of the soil is reduced to a safe utilization level. Entering a safe utilization stage, applying an activating agent in spring, inoculating nitrogen-fixing cyanobacteria, collecting the cyanobacteria after the cyanobacteria overgrow, and repeating the steps until the rice seedlings are transplanted; applying nitrogen-fixing blue-green algae, and planting rice; applying an activating agent after rice harvesting, planting winter green manure, and harvesting in next spring; the process is cyclically carried out until the cadmium content of the soil is reduced to a preferential protection level. The method is low in cost, high in remediation efficiency and good in effect, and a new way is provided for cadmium-polluted rice field remediation.

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

The invention discloses staphylococcus vorus X9 with an antibiotic degradation function and application of the staphylococcus vorus X9 in antibiotic degradation, and belongs to the technical field of microorganisms. The staphylococcus vorus X9 is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.32162. The strain has an excellent degradation effect on erythromycin and oxytetracycline, so that the strain has application value and prospect in the field of antibiotic degradation. Therefore, the compound can be prepared into a microbial agent which is used for purifying an environment polluted by antibiotics.

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

The invention relates to the technical field of soil regeneration, in particular to a method for degrading cadmium-polluted soil based on a heavy metal passivator, which comprises the following steps: S1, preparing PB-MgAl-LDH; s2, carrying out magnetic modification on the PB-MgAl-LDH; s3, preparing a passivating agent; and S4, soil remediation. Solid powder with a good specific surface area and adsorption activity is prepared through steady-state coprecipitation of pine barks and magnesium-aluminum hydrotalcite at a preferable specific growth position, a unique interlayer structure after magnetic modification has magnetism, negative charges are easily generated, adsorption of cadmium is accelerated for balancing the charges, and the adsorption efficiency of cadmium is improved. Meanwhile, lattice diffusion, isomorphous replacement and the like occur, so that the cadmium ion adsorbent shows relatively high ion exchange capacity and adsorption capacity to cadmium ions.

The utility model relates to the technical field of soil remediation, in particular to a soil remediation agent spraying device for soil remediation, which comprises a moving vehicle, a liquid storage barrel is arranged at the top end of the moving vehicle, and a water pump is arranged at the lower end of the surface of the liquid storage barrel; the spraying mechanism is used for comprehensively spraying the soil and is arranged at the front end of the moving vehicle; wherein the spraying mechanism is arranged on the base; in the turning process of the turning roller, a spray head at the front end of the turning roller is used for spraying a remediation agent to the soil before turning, and a spray head at the rear end of the turning roller is used for spraying the turned soil in the moving process of the moving vehicle, so that comprehensive spraying operation on the soil is facilitated; and under the interaction of a cam and a spring, a rack drives a gear to rotate in a reciprocating manner, so that a transverse pipe drives a spray head to swing in a reciprocating manner while spraying, more uniform spraying on the soil is facilitated, and the remediation effect on the soil is improved.

The invention discloses a coal gangue abandoned mine ecological restoration water retention technology, and belongs to the technical field of environmental protection. According to the remediation technology, after the surface soil of the mine is loosened, the alkaline waste and the heavy metal adsorbent are firstly added for neutralization and adsorption pretreatment, and then the composite soil conditioner is continuously added to sequentially cover and construct the improved composite layer soil in a gradient manner; the composite soil conditioner comprises fly ash, steel slag, local clay, straw fibers, water-retaining slow-release microcapsules, charcoal, papermaking white mud and humus soil, high-resistance vegetation is transplanted on the obtained improved composite layer soil, meanwhile, a microbial agent is inoculated, and remediation is completed after the soil is maintained to be stable. According to the method, multiple technical processes are integrated and matched and cooperated with one another, the purpose of long-acting water retention is finally achieved through the combined action of multiple remediation mechanisms of materials, vegetation and microorganisms, and compared with a traditional mine remediation technology, the method is better in stability and longer in acting time and has a good application prospect.

The invention discloses a preparation method of a fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate, which comprises the following steps: carrying out heat treatment on fly ash, cooling, adding into a sulfuric acid solution, stirring and mixing, carrying out solid-liquid separation, adding sodium hydroxide into a liquid product to adjust the pH value to 4.5-6 to obtain an aluminum hydroxide precipitate, washing and roasting to obtain aluminum oxide, and drying to obtain the fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate. The preparation method comprises the following steps: mixing fly ash-Al-MOF with a sulfuric acid solution to obtain an aluminum sulfate solution, uniformly mixing the aluminum sulfate solution with a phthalic acid solution, carrying out solid-liquid separation, washing a solid product, carrying out freeze drying to obtain fly ash-Al-MOF, and respectively loading sodium percarbonate and acid-containing ferrous sulfate on the fly ash-Al-MOF to obtain fly ash-Al-MOF loaded with sodium percarbonate and fly ash-Al-MOF loaded with acid-containing ferrous sulfate; and uniformly mixing the two components to obtain a finished product. Compared with the existing method, the material prepared by the invention can realize long-term, stable, effective and environment-friendly remediation of the organic polluted soil, and the remediation efficiency is high.

The invention discloses a method for repairing arsenic-cadmium combined polluted rice field soil, which comprises the following steps of: reducing the redox potential Eh value of the soil to-100 to-300mV by controlling the height of a flooded water layer of the polluted soil and adding a reducing agent, reducing arsenic in the soil into trivalent arsenic, and simultaneously constructing an indigenous microbial community with high arsenic methylation capability; oxidizing by draining and drying, methylating trivalent arsenic by indigenous microbial communities, and gradually volatilizing arsenic through methylation; and applying a carbon-based functional biological membrane mainly comprising a cadmium passivation flora to stably passivate cadmium. According to the method, the arsenic methylation capacity of microorganisms is improved by precisely regulating and controlling the Eh value, in-situ passivation of cadmium is enhanced through the synergistic effect of the carbon-based carrier and the composite flora, synchronous enhancement of arsenic methylation volatilization and cadmium biological membrane passivation is achieved, the difficulty that an arsenic and cadmium pollution treatment technology is'helpful 'is converted into an acting point of technical breakthrough, and the method is suitable for large-scale popularization and application. The arsenic and cadmium co-treatment of the combined polluted soil is realized.

The invention belongs to the technical field of soil improvement, and discloses a preparation method of a manganese slag-coconut shell charcoal-desulfurized gypsum composite soil improvement agent, the soil improvement agent and application. The preparation method of the soil conditioner comprises the working procedures of manganese residue pretreatment, coconut shell pretreatment, precursor preparation, precursor calcination and conditioner compounding, the pretreated coconut shell and the pretreated manganese residue are mixed and then subjected to ball milling, and a manganese residue-coconut shell precursor is obtained; calcining the prepared manganese residue-coconut shell precursor for 1-4 hours at the temperature of 450-650 DEG C in a protective gas atmosphere to obtain manganese residue-coconut shell biochar; and doping desulfurized gypsum powder into the prepared manganese slag-coconut shell charcoal, and uniformly dispersing to obtain the manganese slag-coconut shell charcoal-desulfurized gypsum composite soil conditioner. The method disclosed by the invention has the advantages of low energy consumption, low cost and capability of treating waste with waste, and the prepared soil conditioner has the advantages of improving soil nutrient balance, reducing nutrient loss and stabilizing pH, and is suitable for modifying the acid soil of the rubber plantation in the tropical region.