32 results about "Chlorohydrocarbon" patented technology

The invention relates to the technical field of molecular biology and environmental biology, and discloses a PCR (Polymerase Chain Reaction) chip and a kit for detecting the expression quantity of functional genes related to microbial degradation of chlorinated hydrocarbon and application of the PCR chip and the kit. The PCR chip comprises a primer pair and a primer pair, the primer pair is used for specifically amplifying dehalogenation functional genes bvcA, cfrA, mbrA, pceA, pteA, tceA and vcrA respectively, the primer pair is used for specifically amplifying reference genes, and nucleotide sequences of the primer pair for specifically amplifying the dehalogenation functional genes are shown as SEQ ID NO. 1 to SEQ ID NO. 14. The PCR chip provided by the invention can specifically amplify seven functional genes related to the degradation of the chlorinated hydrocarbon microorganisms, is good in specificity, high in accuracy and good in repeatability, and can accurately detect the expression condition of the seven dehalogenation functional genes related to the degradation of the chlorinated hydrocarbon microorganisms through a qPCR technology, so that the existence condition of chlorinated hydrocarbon degrading bacteria can be reflected; the method has reliability in the aspects of chlorohydrocarbon polluted site biodegradability evaluation, degradation process research, repair effect verification and the like.

The application discloses a nano zero-valent iron modified hemicellulose biochar composite material and a preparation method and application thereof. The preparation method comprises the following steps: mixing xylan raw materials and iron oxide, performing ball milling treatment, and then performing a carbothermic reduction process in a microwave pyrolysis device under a nitrogen protection atmosphere and a constant temperature condition, so as to obtain the nano zero-valent iron modified hemicellulose biochar material after cooling. The composite material is prepared by using the above preparation method. The composite material is applied to purification treatment of polluted wastewater containing chlorinated hydrocarbons. The composite material has low raw material cost, simple preparation method, can form stable structure pores, has good adsorption performance and catalytic activity, realizes molecular dispersion of zero-valent iron in a hemicellulose biochar matrix, and improves adsorption and reduction capacity of the composite material on chlorinated hydrocarbon pollutants.

The present application provides a preparation method of an aromatic hydrocarbon oligomer, the preparation method including: subjecting an aromatic hydrocarbon compound to an oligomerization reaction under the catalysis of a chloroaluminate ionic liquid to obtain the aromatic hydrocarbon oligomer, where the oligomerization reaction is carried out in a solvent system, and the solvent is selected from chlorinated hydrocarbon solvents, and the aromatic hydrocarbon compound is selected from fused-ring aromatic hydrocarbons with 2 to 4 rings. The preparation method of the present application can efficiently prepare aromatic hydrocarbon oligomers with simple composition and narrow molecular weight distribution under mild conditions, thereby providing a high-quality precursor for the preparation of high-quality mesophase pitch.

The invention discloses hydrocarbon resin with low dielectric constant and high heat resistance as well as a preparation method and application thereof, and the preparation method of the hydrocarbon resin with low dielectric constant and high heat resistance comprises the following steps: S1, in an organic solvent, adding a polycyclic aromatic hydrocarbon compound and a chlorinated hydrocarbon compound for reaction; s2, adjusting the pH value of a reaction system to be neutral, and removing a water phase; s3, part of the organic solvent is removed through distillation till the set solid content is achieved, and a low-dielectric high-heat-resistance hydrocarbon resin solution is obtained after cooling. The low-dielectric high-heat-resistance hydrocarbon resin solves the problems that traditional hydrocarbon resin is insufficient in rigidity, low in strength, poor in heat resistance and low in glass transition temperature after being cured.

The invention relates to a biochar-loaded nano zero-valent iron repair material as well as a preparation method and application thereof. The biochar loaded nano zero-valent iron repair material is prepared from a persulfate-biochar carrier and metal sulfide modified composite acid stabilized nano zero-valent iron sol, the composite acid is composed of gallic acid and humic acid / fulvic acid; the preparation method comprises the following steps: S1, preparing a persulfate-biochar carrier; and S2, preparing the biochar loaded nano zero-valent iron repair material. The method is applied to groundwater chlorohydrocarbon pollution remediation. According to the method, in the reductive dechlorination process of the nano zero-valent reduced iron, released Fe < 2 + > can strengthen persulfate, Fe < 2 + > is regenerated by utilizing the reduction effect of gallic acid on reacted Fe < 3 + >, and catalytic circulation of iron is maintained; humic acid / fulvic acid is used for efficiently driving the degradation process; and metal sulfide is utilized to catalyze reduction of organic chlorine chemicals, so that the reductive dechlorination performance of the nano-iron material is improved, and the repairing effect of chlorinated hydrocarbon is optimized.

The invention discloses a simulation test system and a simulation test method for a process of phytoremediation of chlorinated hydrocarbon pollutants, the simulation test system comprises a plant experiment box, a water supply system, a monitoring assembly, a liquid recovery bottle and an imaging system, the water supply system, the plant experiment box and the liquid recovery bottle are sequentially connected in series through a hose; the imaging system consists of a lighting lamp box, a camera and a computer; the plant experiment box is used as a main body, so that the influence of plants on the distribution of pollutants in a porous medium in different growth environments can be flexibly simulated, and the change of physicochemical property parameters around a root system can be monitored in real time; by tracking the change of the distribution condition of pollutants in a two-dimensional system, the pollutant removal process of phytoremediation is studied, and the removal effect and action mechanism of different plant growth regulation and control technologies, solubilization strengthening technologies and the like on organic pollutants of plants in a simulated porous medium are verified.

The invention belongs to the technical field of paint removers, and particularly relates to a star-structure silane sealing agent, a water-based paint remover and a preparation method and application of the star-structure silane sealing agent and the water-based paint remover. According to the invention, a star-shaped structure silane sealing agent with annular polysiloxane as a core and polyol as a side arm is designed and synthesized, the star-shaped structure silane sealing agent is added into a water-based paint remover, the annular polysiloxane shields and blocks volatilization of polar components in the paint remover, and the polyol side arm is combined with the polar components through hydrogen bond acting force, so that the water-based paint remover is formed. The volatilization failure of alcohol, ester or ketone solvents in the high-temperature paint removal process is avoided, the paint can be removed at a higher temperature, and the paint removal time is shortened. The polyol on the side arm of the sealing agent also has the effect of chelating inorganic ions, so that corrosion caused by deposition of metal ions in the aluminum alloy and influence of precipitation of calcium and magnesium ions in water on the emulsification effect of the oil phase component are avoided. In addition, the water-based paint remover does not contain organic solvents such as chlorinated hydrocarbon, phenols, acetone and the like, and has no influence on the health of operators and the environment.

The application provides a method for degrading chlorohydrocarbon in water by using illite reinforced ball-milling sulfidation micro zero-valent iron, which comprises the following steps: first, a buffer solution with pH=7 is prepared by using 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid, and an oxygen-free aeration treatment is performed; then, illite and S-mZVI bm are mixed to prepare a particle mixture, and the particle mixture is sealed and stored in the buffer solution with pH=7; finally, chlorohydrocarbon pollutants are added into the particle mixture of illite and S-mZVI bm , and a sealed oscillation reaction is performed, so that the concentration of the chlorohydrocarbon in the reaction system is determined. The application directly reinforces the activity of S-mZVI bm material by using illite, which is a clay mineral widely distributed in nature, so that the defects of S-mZVI bm , such as large particle size, slow degradation rate and decreased activity in the later reaction stage, are effectively solved, and the long-term reaction activity of the particles is ensured. The raw materials are green and environmentally friendly, the process is simple, and the materials are easy to obtain.

The invention relates to a compound surfactant, a repairing material and a method for repairing chlorinated hydrocarbon pollutants. The compound surfactant is simple in component, good in solubilizing effect, green and low in toxicity, can effectively reduce the surface tension of an aqueous solution when being dissolved in water, and has relatively high low-temperature water solubility. The repairing material has a good solubilizing effect on hydrophobic chlorinated hydrocarbon, and when the repairing material is used for repairing the chlorinated hydrocarbon pollutants, the problems that in the prior art, a surfactant is poor in solubilizing effect on the chlorinated hydrocarbon pollutants in the underground water environment, cannot be suitable for the underground low-temperature application environment, has secondary pollution and the like are effectively solved.

The invention belongs to the technical field of environmental functional materials, and particularly relates to a cobalt-nitrogen modified zero-valent iron ternary nitride material, preparation thereof and application of the cobalt-nitrogen modified zero-valent iron ternary nitride material in removal of chlorinated hydrocarbon. The invention provides a cobalt nitrogen modified zero-valent iron ternary nitride material which can be used for removing chlorinated hydrocarbon in a water body. Zero-valent iron serves as a matrix, cobalt powder, sodium amide and zero-valent iron powder are mixed through a mechanochemical method, ball milling is carried out under the inert atmosphere, and the cobalt-nitrogen synergistic modified ternary nitride structure is formed. The cobalt powder and the sodium amide are doped into the surface and the interior of the zero-valent iron, so that the zero-valent iron generates lattice strain, the chlorohydrocarbon dechlorination capacity is improved, the preparation process is simple, low in cost, free of pollution and suitable for large-scale application, and the problems of low degradation efficiency and poor selectivity in chlorohydrocarbon pollution treatment are solved.

This invention discloses a method and apparatus for enhancing microbial catalytic degradation of chlorinated hydrocarbons in groundwater using a pulsed electric field, relating to the field of groundwater pollution remediation technology. By introducing microbial stimulants, including nutrients and electron donors, into the polluted groundwater area to enhance the activity of functional microorganisms, and applying a pulsed electric field to create a dynamic potential gradient, the method promotes pollutant migration and microbial metabolism, achieving a stepwise degradation of chlorinated hydrocarbons from highly chlorinated intermediates to low-chlorinated intermediates and ultimately to non-toxic alkanes. Simultaneously, monitoring data such as pollutant concentration, environmental parameters, and microbial activity are collected, and the pulsed electric field parameters and stimulant addition strategy are dynamically adjusted based on this data to match external stimulation with dechlorination requirements. This promotes the continuous and efficient conversion of highly chlorinated hydrocarbons to low-chlorinated hydrocarbons and ultimately to non-toxic alkanes, improving electron utilization efficiency and system stability, shortening the remediation cycle, and reducing energy consumption and the risk of secondary pollution.

The invention belongs to the technical field of groundwater environmental pollution remediation, and particularly relates to a polydisperse iron-carbon emulsion for removing high-salt and high-ammonia-nitrogen groundwater chlorinated hydrocarbon pollution and a preparation method and application thereof. The polydisperse iron-carbon emulsion with excellent dispersity, stability, rheological property and reaction activity is synthesized by taking polydisperse sulfurized zero-valent iron, biochar and a nano-emulsion as raw materials and combining high-speed shearing and rheological property characterization on the basis of specific process parameters and processes. The polydisperse iron-carbon emulsion can realize efficient removal of chlorinated hydrocarbon pollutants under complex underground water environment conditions such as high salt and high ammonia nitrogen. Meanwhile, the inhibition effect of high ammonia nitrogen on the reaction activity can be effectively resisted, the degradation efficiency on pollutants is effectively guaranteed, and the stability and adaptability of a remediation system under complex hydrochemical conditions are improved.

The invention discloses a solid adsorbent for selective adsorption of condensate oil chlorinated hydrocarbon. Raw materials of the solid adsorbent comprise an oil phase and a water phase, wherein the oil phase is prepared from the following components in parts by weight: 8 to 10 parts of octadecyl methacrylate, 1 to 3 parts of butyl methacrylate, 1 to 3 parts of diallyl phthalate and 0.5 to 1.0 part of cross-linking agent; the water phase is prepared from the following components in parts by weight: 0.5 to 1.0 part of an initiator, 0.1 to 1.0 part of a dispersing agent and 30 to 80 parts of water. According to the invention, rigid monomer divinyl phthalate is introduced into an acrylate polymerization system, so that a solid adsorbent with a stable three-dimensional porous structure is successfully constructed, and specific adsorption is enhanced through a polar effect while physical adsorption sites are increased; therefore, the solid adsorbent can efficiently adsorb chlorinated hydrocarbon pollutants in condensate oil in a high-capacity mode, and rapid separation and selective removal of the chlorinated hydrocarbon pollutants in an oil phase are achieved.

The invention belongs to the technical field of groundwater remediation, and relates to a method for remedying chlorohydrocarbon polluted groundwater by coupling ozone micro-nano bubbles with a circulating well, which comprises the following steps: installing a circulating well in a simulation tank, filling the tank with medium sand to simulate a groundwater aquifer medium, then introducing trichloroethylene sewage with a set concentration, and constructing a groundwater pollution simulation system; ozone micro-nano bubbles are generated; and coupling the ozone micro-nano bubbles with the aerodynamic circulation well to carry out underground water remediation. According to the method, volcanic rock is used as a catalyst, ozone micro-nano bubbles and a pneumatic circulating well technology are creatively fused, and typical chlorinated hydrocarbon-trichloroethylene polluted underground water is treated in a targeted mode. Experimental comparison shows that compared with traditional hydrogen peroxide or metal salt catalysis, the method has the advantages that on the basis of saving the cost, the remediation period can be remarkably shortened, the pollutant removal rate is increased, secondary pollution is reduced, the underground water remediation process is accelerated, the dual goals of energy conservation and high efficiency are achieved, and the method has important practical application value and wide popularization prospects.

The present application relates to a kind of Ru / WNP / R-CeO2 catalyst for catalytic oxidation of chlorinated hydrocarbon and its preparation method and application.The catalyst is composed of highly dispersed Ru, W nanoparticle (WNP) and CeO2 carrier.It is prepared by hydrothermal method combined with excess impregnation method: first, prepare rod-shaped RCeO2 carrier and WNP toluene dispersion, then load WNP and Ru active component in turn by stepwise impregnation, and obtain by drying and calcining.The catalyst can completely oxidize high concentration (1000 ppm) of dichloromethane or chlorobenzene to HCl / Cl2, CO2 and H2O at lower temperature (300~350 ℃).Compared with prior art, the present application has the advantages of high catalyst activity, good selectivity, simple preparation method, wide industrial application prospect in the field of chlorinated organic waste gas purification, etc.

The invention discloses bacillus cereus ZYL and application of the bacillus cereus ZYL in degradation of chlorinated organic pollutants. A degrading bacterium provided by the invention is a gram staining positive bacterium and can be metabolized by utilizing dichloromethane; under the condition of pure culture, the bacterium has better degradation capability on dichloromethane under the condition that the pH value is 6.0-8.0, and can completely degrade 35 mg / L dichloromethane within 96 hours under the conditions that the pH value is 7.0 and the temperature is 30 DEG C; the strain can grow and degrade the substrate by using dichloromethane as a carbon source and an energy source, has certain environmental adaptability, and can be used for repairing chlorinated hydrocarbon polluted atmosphere and polluted environment.

The invention discloses a sulfur-nickel zero-valent iron material for deep hydrogenolysis dechlorination based on a high-valence sulfur source and application, and belongs to the field of environmental remediation materials. According to the method, a one-step ball milling process is adopted, an iron source, a nickel source and a high-valence sulfur source are subjected to co-ball milling, and the sulfur-nickel co-doped ball-milled zero-valent iron material is prepared. Compared with a conventional material using a low-valence sulfur source, the high-valence sulfur source is introduced, so that the microstructure and the surface chemical state of the material can be remarkably regulated and controlled, the degradation path of the chlorinated hydrocarbon is effectively changed, the chlorinated hydrocarbon is mainly degraded through a deep reduction hydrogenolysis path, and the degradation efficiency of the chlorinated hydrocarbon is improved. And a beta-elimination way which easily generates toxic by-products such as dichloroethylene and vinyl chloride is not used. The material shows more thorough dechlorination capability and higher electronic efficiency in the remediation of chlorinated hydrocarbon pollutants such as trichloroethylene, meanwhile, the dissolution amount of nickel ions is kept extremely low, and the material is environment-friendly. The invention provides a novel technical approach for developing a novel efficient and stable chlorohydrocarbon repair material without accumulation of byproducts.

This invention discloses a modified alumina nanoparticle and a modified composite adsorbent, as well as their preparation method and application, belonging to the field of polymer adsorbent technology. The modified alumina nanoparticle preparation method is as follows: (1) Alumina nanoparticles are added to a dispersion medium, ultrasonically treated, the supernatant is removed, and more dispersion medium is added; (2) A silane coupling agent is added, the mixture is stirred, washed, and dried to obtain the final product. The modified composite adsorbent includes an oil phase and an aqueous phase; the preparation method is as follows: (1) An oil phase is obtained; (2) A suspension is formed; (3) An aqueous phase is obtained; (4) The oil phase is added to the aqueous phase, stirred, aged, cooled, washed, and dried to obtain the final product. In an acrylate-based polymerization system, this invention introduces modified alumina nanoparticles to chemically modify the material surface, increasing the density of surface active sites and enhancing the specific capture ability of chlorinated organic compounds, thereby achieving rapid capture and selective separation of chlorinated hydrocarbons in the oil phase.

The invention provides a multi-element monomer stable isotope source analysis method for chlorinated hydrocarbon in underground water, and relates to the field of underground water pollution traceability, the method comprises the following steps: constructing a three-dimensional isotope characteristic matrix according to a determined target pollutant and a corresponding carbon, chlorine and hydrogen monomer stable isotope system; the method comprises the following steps: arranging sampling points in a polluted site, collecting an underground water sample and pre-treating; performing isotope determination on the sample to obtain isotope data; constructing a fractionation model of carbon, chlorine and hydrogen isotopes; inputting the isotope data into a fractionation model for correction; and performing clustering analysis in a three-dimensional isotope space by using the corrected isotope data in combination with the three-dimensional isotope feature matrix, identifying different pollution sources, and performing result verification in combination with chemical fingerprint features and an underground water flow field model. According to the technical scheme, dependence on traditional concentration discrimination is weakened, and fine discrimination and contribution quantification between different pollution sources are achieved.

The application provides an anti-sintering high-efficiency fluorite-type high-entropy oxide catalyst and a preparation method and application thereof. The fluorite-type high-entropy oxide catalyst comprises a fluorite phase ceria and transition metal oxides doped in the fluorite phase ceria, containing manganese, nickel, cobalt, zirconium and magnesium. With the aid of high-entropy hysteresis diffusion effect, the application effectively inhibits grain sintering and active component migration at high temperature, and improves the high-temperature structural stability and anti-aging performance of the catalyst. At the same time, through the synergistic coupling effect of multiple metal components, multiple redox reaction sites are constructed, and the catalytic oxidation capacity of the catalyst is improved, which can adapt to industrial harsh working conditions under high-temperature environment. The catalyst is prepared by a coprecipitation process, and has the advantages of simple preparation process, strong controllability, easy scale production and efficient degradation of various volatile organic pollutants such as aromatic hydrocarbons, alkanes and chlorinated hydrocarbons.

This invention relates to the field of environmental engineering technology, specifically to a highly efficient solubilizing surfactant for chlorinated hydrocarbons, its application, and a method for its preparation. The surfactant comprises decaethylene glycol monododecyl ether, Tween 20, and water. This surfactant is used to solubilize chlorinated hydrocarbon organic pollutants in contaminated sites, including soil, groundwater, and surface water. The mixture of decaethylene glycol monododecyl ether and Tween 20 produces mixed micelles, which increases the solubility of chlorinated hydrocarbons in water and significantly reduces the CMC value of the mixed surfactant, effectively reducing the amount of surfactant required and lowering remediation costs. This surfactant exhibits good biodegradability, high solubilizing ability, and low cost, achieving environmental pollution remediation while reducing secondary pollution.

This invention discloses a rocket casing cleaning agent and its preparation method, belonging to the field of rocket casing cleaning technology. The cleaning agent comprises the following components by mass percentage: 10%-20% decafluoro-3-methoxy-2-trifluoromethylpentane, 50%-70% hydrofluoroether, 2%-20% fluoroalcohol, 1%-5% cyclohexane, and 1%-5% co-solvent. The components selected in this invention are free from heavy metals, strong alkalis, nitrites, phosphorus, amines, amides, and highly toxic and volatile organic solvents such as chlorinated hydrocarbons, phenols, and ketones. It possesses the functions of cleaning dirt and protecting coatings, high cleaning power, safety, environmental friendliness, energy saving, and an ODP value of 0. It provides excellent cleaning effect, long-lasting cleaning, and effectively improves coating adhesion; it does not damage the aluminum-based material of the casing; the preparation method is simple and easy to implement, with a high safety factor during cleaning, and the waste liquid can be recycled, making it economical, safe, energy-saving, and environmentally friendly. It effectively solves the problems of high toxicity, strong odor, low flash point, and environmental damage associated with traditional cleaning agents.

The present application relates to a kind of molybdenum disulfide promoted cobalt catalyzed carbonylation esterification reaction method, which uses cobalt salt as catalyst, molybdenum disulfide as cocatalyst, under mild reaction conditions, in carbon monoxide atmosphere, olefin compound or epoxy compound or chlorohydrocarbon compound is reacted with alcohol, and carboxylic acid ester compound is prepared.The reaction condition of the present application is mild, low in cost, and can avoid using metal powder and sodium thiosulfate as reducing agent, and no other transition metal is introduced in the reaction.

The application relates to an environment-friendly desorption material for efficiently repairing chlorinated hydrocarbon contaminated aquifers. The total mass of the desorption material is used as a basis, and the desorption material comprises the following components: 1.0 wt.% alkyl polyglycoside (APG) 1214, 5.6 wt.% co-surfactant, and 0.8 wt.% sodium chloride, wherein the co-surfactant is composed of n-propanol and isobutyl alcohol at a mass ratio of 1:1. The prepared desorption material has a wide environmental application range, a low surfactant dosage, and high desorption performance. The alcohol of the composite alcohol desorption material is wide, the particle size is small, and the interfacial tension is small; the desorption rate of in-situ leaching PCE reaches 99.4%, which is 68% higher than that of single surfactant (1.0 wt.% APG1214) at the same temperature; the primary biodegradation degree of the surfactant APG1214 reaches 90.27% at 163 h, and the secondary pollution generated in the repair process is small.

The invention provides an organic silicon storage tank emptying tail gas treatment device and method.The device comprises a tail gas buffer tank, the tail gas buffer tank is connected with an inlet of a compressor through a pipeline, an outlet of the compressor is connected with a heater through a pipeline, and an outlet of the heater is connected with an inlet of a first reactor through a pipeline; the first reactor outlet is connected with the second reactor inlet through a pipeline. The tail gas treatment method comprises the following steps: mixing vented tail gas from a chloromethane storage tank with vented tail gas from a chlorosilane storage tank to obtain mixed gas; the mixed gas reacts after being compressed and preheated in sequence; and condensing a gas phase after reaction, condensing light components into a liquid phase, collecting the liquid phase, and incinerating non-condensable gas-phase tail gas. The tail gas of the chloromethane storage tank and the tail gas of the chlorosilane storage tank are collected and react with each other in the reactor, on one hand, light components such as olefin and chlorohydrocarbon are removed through the reaction, the emptying partial pressure of chloromethane is reduced, and the emptying amount of chloromethane is reduced;

The invention discloses a chlorohydrocarbon efficient synergistic degradation combined fungicide, a preparation method and application, and belongs to the technical field of microorganisms, the combined fungicide contains any one strain from rhodococcus or flavobacterium, and any one strain from bacillus, acinetobacter or comamonas. Through limitation of specific bacterium genus combination and artificial proportion optimization, the combined bacterium agent realizes a stable synergistic effect among different bacterium genus, the degradation efficiency is remarkably enhanced, and the 24-hour degradation rate of chlorinated hydrocarbon can be increased to 70% or above and is remarkably higher than that of a single bacterium system. Meanwhile, large-scale production can be achieved through the combined microbial agent, the overall cost is lower than that of a conventional scheme when the combined microbial agent is used for treating chlorinated hydrocarbon pollutants, additional secondary treatment is not needed after repairing is completed, and economic benefits are remarkable. When the combined microbial agent is used for treating chlorinated hydrocarbon pollutants, high-temperature treatment or chemical oxidation agents are not needed, and the combined microbial agent conforms to the development direction of current environmental protection laws and regulations and green restoration technologies.

The present application relates to a method for in-situ remediation of chlorinated hydrocarbon contaminated soil and groundwater and its application, which adds nutrient aid solution and sulfate-reducing bacteria agent into the chlorinated hydrocarbon contaminated soil and groundwater, the nutrient aid contains organic acid salt and ferrous salt with complexation. In the method of the present application, the organic acid salt as nutrient aid promotes the growth of sulfate-reducing bacteria, which reduces sulfate to negative bivalent sulfur, and the negative bivalent sulfur reacts with divalent iron ion to generate ferrous sulfide; the organic acid salt as complexing agent forms water-soluble complex with iron ion, and promotes the dissolution of iron in non-water-soluble iron oxide in soil particles, which greatly increases the generation amount of ferrous sulfide. The organic acid salt prevents the passivation of ferrous sulfide after reducing chlorinated hydrocarbon. The above-mentioned water-soluble complex of organic acid ferrous salt, ferrous sulfide and sulfide system can efficiently reduce high-concentration chlorinated hydrocarbon pollution at low cost, solve the inhibition of high-concentration chlorinated hydrocarbon on anaerobic dehalogenation bacteria, and lay a foundation for subsequent combined use of anaerobic dehalogenation biological remediation technology.

The invention relates to a preparation method of methyl phosphite, which comprises the following steps: mixing methyl phosphonium dichloride with water for first reaction to generate a liquid-phase intermediate and gas-phase hydrogen chloride; carrying out a second reaction on the liquid-phase intermediate and butanol to generate methyl phosphite and gas-phase hydrogen chloride; and meanwhile, introducing protective gas to separate out gas-phase hydrogen chloride, thereby obtaining the methyl phosphite. According to the preparation method disclosed by the invention, excessive butanol does not need to be used, so that alkyl chlorinated hydrocarbon by-products are prevented from being generated while full reaction synthesis of the methyl phosphite is realized, and the yield of the methyl phosphite is favorably improved.

The invention is applicable to the technical field of groundwater pollution remediation, and particularly relates to application of a cardanol-based nonionic surfactant in contaminated groundwater remediation, the cardanol-based nonionic surfactant is cardanol polyoxyethylene ether, the molecular formula of the cardanol-based nonionic surfactant is C15H31-2nC6H4O (C2H4O) mH, n is 0-3, and m is 7 or 9. According to the invention, the interfacial tension of a chlorinated hydrocarbon-water system can be reduced from more than 35 mN / m to less than 10 mN / m, the adhesive force between pollutants and the surface of a porous medium is effectively weakened, and desorption and migration are promoted; the solubility of tetrachloroethylene in a water phase can be improved by more than 120 times, so that the mobility of chlorohydrocarbon in underground water is remarkably enhanced, and subsequent extraction and removal are facilitated; the degradation rate of the cardanol-based nonionic surfactant is not lower than 90%, and the cardanol-based nonionic surfactant can be rapidly degraded in the environment and has good environmental friendliness; the stability and the solubilizing performance can be maintained under the conditions that the pH is 3-9, the inorganic salt concentration is less than or equal to 100 mM and the temperature is 10-25 DEG C, and the water soluble fertilizer is suitable for long-term application in a complex underground water environment.

The invention discloses a method and a system for repairing chlorohydrocarbon polluted underground water based on a slow-release repairing agent. Potassium persulfate and sodium persulfate are compounded according to the ratio of 4: 1, and sodium bentonite is added to prepare homogeneous suspension slurry; 32% NaOH is independently prepared; the two are mixed on line through a static mixer, GeoProbe direct-pushing high-pressure injection is carried out, and progressive injection is carried out from top to bottom at equal depth intervals of 0.5 m in the same vertical channel. The system is of an integrated structure of double-tank independence, online mixing and direct-push injection, wherein the integrated structure is formed by connecting a medicament tank 1, a medicament tank 2, a static mixer and GeoProbe in series. Bentonite enhances the stability of the suspension slurry and forms a clay-oxidant composite slow-release structure, so that the problem that potassium persulfate cannot be injected is solved; the effective concentration of the compound oxidizing agent is maintained for more than 4 months and is obviously superior to that of single sodium persulfate; and single-hole multi-layer injection reduces drilling holes and inhibits back diffusion. The in-situ remediation agent has efficient degradation and long-acting remediation capabilities, and is suitable for in-situ remediation of low-permeability stratums and persistent pollutants.