41results about How to "Strong mass transfer" patented technology

The invention discloses a method for treating chlorinated organic pollutants in underground water by using a slow-release compound repair material. The method comprises the following steps: (1), preparing charcoal through high temperature pyrolysis; (2), pre-treating zero-valent iron through acid pickling; (3), adding water into the charcoal, then adding xanthan gum and an organic carbon source, and finally, adding zero-valent iron, and through steps of treating, obtaining the slow-release compound repair material; then treating chlorinated organic pollutants in underground water by adopting an in situ injection repairing method or an in situ PRB repairing method. According to the method provided by the invention, the xanthan gum with high mechanical strength and strong mass transfer performance is used as a novel slow release embedding medium, the physical adsorbent charcoal, the chemical reductant zero-valent iron and the bioreductive drug organic carbon source are taken as effective components for composite embedding, so that gel microspheres with stable structures are formed, and the method provided by the invention has the advantages of sustained release, simple and convenient operation, low cost, environment friendliness and the like, can effectively achieve physically, chemically and biologically collaborated and enhanced remediation, and can effectively remove target pollutants.

The invention, belonging to the technical field of catalyst and its application, particularly relates to an ultrafine molecular sieve structured catalytic material based on a porous silicon carbide carrier and a preparation method thereof. The material comprises ultrafine molecular sieve crystals as active elements and has a hierarchically porous structure, and the whole ultrafine molecular sieve coating has catalytic activity. The method is characterized by coating a colloidal molecular sieve precursor on the surface of a modified foam silicon carbide carrier, converting the molecular sieve precursor into ultrafine molecular sieve crystals by vapor phase treatment to realize the firm combination between the coating and the carrier. According to the invention, by controlling the synthesis conditions of the colloidal molecular sieve precursor and the method of adding a pore forming agent, the size of the molecular sieve crystals, silica-alumina ratio and intercrystalline porosity can be controlled; a pore structure and the type of the molecular sieve can be designed according to the geometrical structure of a target product; and the capacity of accommodating carbon is raised, the mass transfer capability of the catalyst is reinforced, and the life of catalyst is prolonged while keeping the high activity of the ultrafine molecular sieve and high target product selectivity.

The invention discloses a preparation method of a nano molybdenum disulfide / nitrogen-doped carbon nanotube array hybrid composite electrode. A carbon fiber fabric coated with a conductive carbon black layer is used as a substrate; a nitrogen-doped carbon nano tube array carrier is controllably prepared on a carbon fiber substrate through a chemical vapor deposition technology; then nitrogen-doped carbon nano tubes are oxidized to realize surface functionalization; and then the nitrogen-doped carbon nano tubes are firmly combined with a nano molybdenum disulfide material in a chemical bond form to form an electrode material with an integrated three-dimensional parallel hole structure and a bidirectional catalysis function. According to the invention, the carrier provided by the invention has excellent conductivity and relatively high mass transfer and load transfer capabilities; the nano molybdenum disulfide material combined by chemical bonds has good bidirectional catalytic activity of oxygen electroreduction and oxygen anion electrooxidation; the diffusion resistance and ion transmission resistance of oxygen species are reduced; the electrochemical activity and the structural stability of an electronic conductor are improved; and the preparation method has wide application prospects in electrode materials such as metal-air batteries, proton exchange membrane hydrogen fuel cells and direct methanol fuel cells.

The invention belongs to the field of catalysts and an application of the catalysts, and in particular relates to a porous silicon-carbide carrier surface gradient pore molecular sieve coating and a preparation method thereof. The porous silicon-carbide carrier surface gradient pore molecular sieve coating has the intercrystal porosity with continuous gradient change, the porosity among molecular sieve crystals in an inner molecular sieve coating is low, and the porosity among molecular sieve crystals in an outer molecular sieve coating is high. The coating is realized through two-step coating combined with steam treatment: a colloidal state molecular sieve precursor is coated on the surface of a foamed silicon-carbide carrier; a mixer of the colloidal state molecular sieve precursor, the molecular sieve crystals and a pore forming agent is coated; and finally, the molecular sieve precursor is converted into the molecular sieve crystals through steam treatment so as to realize the firm bonding between the coating and the carrier. The proportion of the colloidal state molecular sieve precursor to the molecular sieve crystals is controlled, the pore forming agent is added, and the intercrystal porosity of the coating can be regulated. The gradient coating and the carrier are firmly bonded, and the coating is high in mass transfer capacity and suitable for large-scale preparation.

The invention provides a method for preparing propargyl alcohol by using a micro-structural reactor, which comprises the steps of by taking a simple Grignard reagent as a raw material, carrying out gas-liquid Grignard exchange reaction on the simple Grignard reagent and acetylene gas to generate a high-quality acetylene-based magnesium bromide Grignard reagent, carrying out nucleophilic addition reaction on the obtained acetylene-based magnesium bromide Grignard reagent and an electrophilic reagent in a continuous flow condition, and carrying out hydrolysis, separation and refining on the product to obtain a substitution propargyl alcohol product. The method provided by the invention has the advantages that the operation is simple, the raw material and the reagent are simple, cheap and easily available, the process is continuous, rapid and controllable, the condition is mild, the product has good selectivity and industrial production can be realized.

The invention discloses a slow-release compound repair material for treating chlorine-containing organic pollutants in groundwater and a preparation method thereof. The preparation method comprises the steps of (1) preparing biochar by high-temperature pyrolysis; (2) pretreating zero-valent iron by acid pickling; and (3) adding water into the biochar, adding xanthan gum and an organic carbon source, adding zero-valent iron finally, and carrying out multi-step treatment on the obtained mixture so as to obtain a slow-release compound repair material for treating chlorine-containing organic pollutants in groundwater. According to the invention, by using the xanthan gum with high mechanical strength and strong mass transfer performance as a novel slow-release embedding agent, the biochar (as a physical adsorbent), the zero-valent iron (as a chemical reductant) and the organic carbon source (as a biological reductant) which are taken as effective components are compositely embedded so as to form constitutionally stable gel microspheres, and the slow-release compound repair material has the advantages of long-term slow-release, easy operation, low cost, environment friendliness, and the like, and can effectively realize the physical, chemical and biological synergistic reinforced repair, therefore, the material can remove target pollutants more efficiently.

The present invention discloses one kind of pre-filming flow nozzle, stillpot with the nozzle and the production process of superfine particle in the stillpot with the nozzle. The nozzle includes casing, pre-filming unit, flow channel, ring gap flow channel, etc. and has the structure with greatly lowered flow resistance on solution and less jamming caused by the solute particle. The stillpot has simple structure, convenient operation, light labor strength and excellent sealing effect owing to the C-shaped metal sealing part with upper and lower sealing planes in linear contact state. By means of the supercritical fluid forced dispersing solution process in the stillpot with the nozzle, superfine solute particle may be prepared.

A high-speed and down-flow type sludge back-mixing anaerobic reactor is disclosed. The main body is provided with a down-flow reaction area, an up-flow reaction area, an air-solid-liquid separation area and a water outlet area from the bottom to the top. The down-flow reaction area is formed by relative arrangement of a bucket shape body in the lower part and a taper cover in the upper part, a gap is saved between the bucket shape body and the taper cover, and the up-flow reaction area is above the taper cover; the air-solid-liquid separation area is provided with a three-phase separator, a water outlet weir is arranged above the water outlet area, and a water outlet pipe is arranged on the water outlet weir; a sludge reverse lifting backflow device is arranged on the top part of the main body, the device comprises an air-water separating tank, a sludge reverse lifting pipe and a backflow pipe, the sludge reverse lifting pipe is arranged between the air-water separating tank and the bottom of the down-flow reaction area, and the backflow pipe is arranged between the air-water separating tank and the bottom of the up-flow reaction area. The mass transfer of the sludge in the reactor is in a high-speed, reverse and down-flow mode, the mass transfer is stronger, the loss of sludge is maximally reduced, and the processing efficiency is prominently improved.

The invention discloses a slow-release composite repairing reagent for treating persistant halohydrocarbons in soil and a preparation method of same. The preparation method includes steps of: 1) preparing microbial liquid saturated black charcoal; 2) preparing a colloidal solution A containing locust bean gum and an organic carbon source; 3) preparing a colloidal turbid liquid B containing the locust bean gum, organic carbon source, nano zero-valent metal, and the microbial liquid saturated black charcoal; 4) performing a crosslinking reaction for 2-6 h; 5) performing a delayed crosslinking reaction for 2-6 h to obtain the slow-release composite repairing reagent. By means of excellent adsorption performance of the black charcoal, high-effective chemical reduction effect of the nano zero-valent metal and dissimilatory iron reduction dehalogenation capability of functional microorganisms, the repairing reagent can achieve physical-chemical-biological synergistic reinforced repairing effect to the soil polluted by the persistant halohydrocarbons, and has advantages of long action period, stable structure, low cost and environment-friendly property.

The invention discloses a method for treating persistent halogenated hydrocarbons in soil by a slow-release compound remediation agent. The method includes steps: pre-ploughing contaminated soil, directly spreading a certain quantity of the slow-release compound remediation agent into ploughed soil, harrowing to well mix, watering to keep certain moisture content, and covering the soil surface with a protecting layer to realize anaerobic reduction dehalogenation reaction, wherein spreading quantity of the remediation agent is 0.05-1.5% of the dry weight of the contaminated soil, the soil ploughing depth is 25-40cm, the soil moisture content is adjusted to 50-80% of maximum field moisture capacity after spreading of the remediation agent, and remediation treatment time is 30-350d. The remediation method takes advantages of great adsorption performance of black charcoal, efficient chemical reducibility of nano zero-valence metal and dissimilatory iron reduction dehalogenation performanceof functional microorganisms to achieve physical, chemical and biological synergistic remediation effects on persistent halogenated hydrocarbon contaminated soil and has advantages of long action period, structural stability, low cost, environmental friendliness and the like.

The invention discloses a purpose of a water-quality purifying agent containing biological enzymes, and particularly relates to the purpose of the water-quality purifying agent containing biological enzymes for polluted water quality purification. The water-quality purifying agent is prepared from the following ingredients in parts by weight: 20 to 25 parts of enzyme loading sorghum straw active carbon, 4 to 6 parts of sodium alginate, 6 to 8 parts of polyferric chloride, 3 to 7 parts of polyaluminium chloride, 30 to 35 parts of modified bentonite, 3 to 7 parts of polyacrylamide, 3 to 8 partsof plant fiber and 200 to 300 parts of distilled water. The purpose has the beneficial effects that all of the ingredients in the water-quality purifying agent can achieve the cooperated effect; through physical and chemical adsorption, harmful substances such as nitrogen, phosphorus, organic matters and heavy metal ions in the sewage can be effectively eliminated, so that impurities, eutrophication substances and the like can be settled through flocculation; meanwhile, the relatively good surface performance is realized; the selective adsorption effect on the organic contaminants is good.

The invention provides a method of preparing 2, 4, 5-trifluorobenzoic acid by a microstructural reactor. The method comprises the following steps: by taking 2, 4, 5-trifluorobromobenzene as a raw material, carrying out Grignard exchange with a Grignard reagent to obtain 2, 4, 5-trifluorophenyl magnesium bromide; and under a continuous flow condition, carrying out a nucleophilic addition on the generated 2, 4, 5-trifluorophenyl magnesium bromide and a gas CO2 to prepare the 2, 4, 5-trifluorobenzoic acid. The method provided by the invention has the characteristic of continuously and quickly preparing 2, 4, 5-trifluorobenzoic acid, is controllable in process and good in product selectivity and can realize industrialized production.

A high-speed and down-flow type sludge back-mixing anaerobic reactor is disclosed. The main body is provided with a down-flow reaction area, an up-flow reaction area, an air-solid-liquid separation area and a water outlet area from the bottom to the top. The down-flow reaction area is formed by relative arrangement of a bucket shape body in the lower part and a taper cover in the upper part, a gap is saved between the bucket shape body and the taper cover, and the up-flow reaction area is above the taper cover; the air-solid-liquid separation area is provided with a three-phase separator, a water outlet weir is arranged above the water outlet area, and a water outlet pipe is arranged on the water outlet weir; a sludge reverse lifting backflow device is arranged on the top part of the main body, the device comprises an air-water separating tank, a sludge reverse lifting pipe and a backflow pipe, the sludge reverse lifting pipe is arranged between the air-water separating tank and the bottom of the down-flow reaction area, and the backflow pipe is arranged between the air-water separating tank and the bottom of the up-flow reaction area. The mass transfer of the sludge in the reactor is in a high-speed, reverse and down-flow mode, the mass transfer is stronger, the loss of sludge is maximally reduced, and the processing efficiency is prominently improved.

The invention discloses a sustained-release composite remediation agent for treating persistent halogenated hydrocarbon in groundwater and a preparation method thereof. The preparation method comprises the following steps: 1) preparing bacterial liquid saturated black carbon; 2) preparing a colloidal solution A containing locust bean gum and an organic carbon source; 3) preparing a colloidal suspension B containing locust bean gum, an organic carbon source, a nano-scale zero-valent metal and the bacterial liquid saturated black carbon; 4) carrying out a crosslinking reaction for 2-6h; and 5) carrying out a delayed crosslinking reaction for 2-6h to obtain a sustained-release composite remediation agent for treating persistent halogenated hydrocarbon in groundwater. The sustained-release composite remediation agent prepared by the method provided by the invention can utilize the good adsorption performance of black carbon, the high-efficiency chemical reducibility of the nano-scale zero-valent metal and the dissimilation iron reduction dehalogenation capability of functional microorganisms to achieve the physical, chemical and biological synergistic remediation effect of persistent halogenated hydrocarbon polluted groundwater, and has the advantages of long action period, stable structure, low cost, environmental friendliness and the like.

A method is described for the preparation of a trimethylcyclohexyl-alkan-3-ol containing a proportion of trans isomer of Formula D whereR=H, Me, Et, n-propyl, iso-propyl, n-butyl, iso-butyl or tert-butyl andR1=Me, Et, n-propyl, iso-propyl, n-butyl, iso-butyl or tert-butyl,or of a mixture of several such trimethylcyclohexyl-alkan-3-ols,wherein the method comprises catalytically hydrogenating corresponding compound(s) of Formula B in which R and R1 in each case have the indicated meanings, in the presence of a nickel catalyst, preferably of Raney nickel, and in an absence of catalytically active amounts of copper chromite.

The invention belongs to the field of organic synthesis, and particularly relates to a continuous flow high-efficiency production method of 2-amino-4-nitrotoluene, acetic anhydride and acetic acid are adopted for acylation salt formation, the reaction danger coefficient is reduced, halogenated hydrocarbon is used as a solvent for nitration reaction, the viscosity is small, the danger is small, the solvent can be recycled, and the production cost is low. And the problems of reaction period and reaction conversion rate are solved by adopting the micro-channel reactor, and the reaction yield is further improved by hydrolyzing with sulfuric acid and neutralizing with alkali liquor in the hydrolysis reaction. The method has the advantages of good economy, high atom utilization rate, good safety, continuous production of nitration reaction, and good industrial production prospect.

The invention discloses a method for treating chlorinated organic pollutants in underground water by using a slow-release compound repair material. The method comprises the following steps: (1), preparing charcoal through high temperature pyrolysis; (2), pre-treating zero-valent iron through acid pickling; (3), adding water into the charcoal, then adding xanthan gum and an organic carbon source, and finally, adding zero-valent iron, and through steps of treating, obtaining the slow-release compound repair material; then treating chlorinated organic pollutants in underground water by adopting an in situ injection repairing method or an in situ PRB repairing method. According to the method provided by the invention, the xanthan gum with high mechanical strength and strong mass transfer performance is used as a novel slow release embedding medium, the physical adsorbent charcoal, the chemical reductant zero-valent iron and the bioreductive drug organic carbon source are taken as effective components for composite embedding, so that gel microspheres with stable structures are formed, and the method provided by the invention has the advantages of sustained release, simple and convenient operation, low cost, environment friendliness and the like, can effectively achieve physically, chemically and biologically collaborated and enhanced remediation, and can effectively remove target pollutants.

The invention discloses an air mixing treatment system for flue gas. The air mixing treatment system comprises an air mixing pipe, an air outlet pipe, a tail gas delivery pipe and a high-temperature flue gas delivery pipe, and further comprises an air mixing treatment device arranged in the air mixing pipe; the air mixing treatment device comprises an air pre-mixing pipe and an air final mixing pipe; the air pre-mixing pipe is arranged a hollow cavity in an air mixing chamber; the high-temperature flue gas delivery pipe is hermetically connected with the side wall of the air pre-mixing pipe and penetrates through an inner cavity of the air pre-mixing pipe; the air final mixing pipe is connected with an air outlet of the air pre-mixing pipe; an air inlet of the air final mixing pipe is greater than the air outlet of the air pre-mixing pipe; and the air final mixing pipe is a tapered pipe arranged in manner of gradually reducing from the air inlet end to the air outlet end of the air final mixing pipe. According to the technical solution of air mixing treatment system disclosed by the invention, intensive mass transfer and heat transfer mixing is performed on high-temperature flue gas and tail gas entering the air pre-mixing pipe and the air final mixing pipe, so that the high-temperature flue gas and the tail gas are exchanged more fully in heat, and mixed more evenly, and a heat transfer and mass transfer effect is better.

The invention discloses a preparation method of a nano molybdenum disulfide / nitrogen-doped carbon nanotube array hybrid composite electrode. A carbon fiber fabric coated with a conductive carbon black layer is used as a substrate; a nitrogen-doped carbon nano tube array carrier is controllably prepared on a carbon fiber substrate through a chemical vapor deposition technology; then nitrogen-doped carbon nano tubes are oxidized to realize surface functionalization; and then the nitrogen-doped carbon nano tubes are firmly combined with a nano molybdenum disulfide material in a chemical bond form to form an electrode material with an integrated three-dimensional parallel hole structure and a bidirectional catalysis function. According to the invention, the carrier provided by the invention has excellent conductivity and relatively high mass transfer and load transfer capabilities; the nano molybdenum disulfide material combined by chemical bonds has good bidirectional catalytic activity of oxygen electroreduction and oxygen anion electrooxidation; the diffusion resistance and ion transmission resistance of oxygen species are reduced; the electrochemical activity and the structural stability of an electronic conductor are improved; and the preparation method has wide application prospects in electrode materials such as metal-air batteries, proton exchange membrane hydrogen fuel cells and direct methanol fuel cells.

The invention discloses a method for continuously and rapidly preparing propiolic acid and derivatives thereof by using a microreactor. The preparation method comprises the following steps: firstly, under anhydrous and anaerobic conditions, adding magnesium metal, elemental iodine and a solvent into a reactor, uniformly stirring, and then dropwise adding halogenated hydrocarbon to react to generate a hydrocarbyl magnesium halide Grignard reagent; in a microreactor, with the prepared alkyl magnesium halide and terminal alkyne as raw materials, performing a Grignard exchange reaction under a continuous flowing condition to obtain alkynyl magnesium halide; and by using the alkynyl magnesium halide and CO2 as raw materials, carrying out nucleophilic addition reaction under continuous flow to prepare the propiolic acid compound. The method provided by the invention has the characteristics of rapid and continuous preparation of propiolic acid, continuous and controllable process and mild conditions, and can achieve industrial production.

The invention provides powder coke multi-layer cyclone circulation coupling microwave auxiliary-heating integrated denitration apparatus. The apparatus comprises a multi-layer cyclone bed, a booster fan (5) connected to the multi-layer cyclone bed, a screw feeder (6) connected to the bottom of the multi-layer cyclone bed, a dust remover (7) positioned behind the multi-layer cyclone bed, a conveyor(10) connected to the bottom of the multi-layer cyclone bed, and a microwave device; the multi-layer cyclone bed comprises a vertical-mounted cyclone cylinder (1) and an n-layer cyclone plate (2) arranged in the cyclone cylinder (1), wherein the n is selected from 3-5; the microwave device is connected with the multi-layer cyclone bed; and the conveyer (10) is provided with a centrifugal fan (9).Compared with the regular active coke, powder coke has a larger specific surface area and a faster reaction characteristic, and selective heating can be carried out by adopting microwave, so that theintegrated denitration apparatus provided by the invention has the advantages of high heat transfer efficiency, strong mass transfer, uniform distribution of a flow field, controllable residence timeand the like, and has strong technical extension applicability.

The invention discloses a full-mixing MBBR aerobic reactor. The full-mixing MBBR aerobic reactor has a good mass transfer effect and a highly-efficient and stable treatment effect. The full-mixing MBBR aerobic reactor comprises a cylindrical shell and a gas-liquid separation tank, the cylindrical shell is formed by an outer cylindrical shell and inner flow guiding cylinders, two ends of the inner flow guiding cylinders are open, a gas collecting hood and a gas stripping tube are arranged in every inner flow guiding cylinder, the gas collecting hoods are connected with the gas-liquid separation tank arranged at the upper part of the cylindrical shell through the gas stripping tubes, baffle plates are arranged below the gas collecting hoods, the baffle plates are fixed on the inner walls of the inner flow guiding cylinders, flow guiding seams are arranged between the baffle plates and the gas collecting hoods, an aeration system is arranged at the middle of the shell of every inner flow guiding cylinder, and a water distributor is arranged just below the inner flow guiding cylinders to realize entrance of water to the bottom and annular uniform water distribution; the gas-liquid separation tank is provided with a gas outlet and water falling tubes, the upper ends of the water falling tubes communicate with the gas-liquid separation tank, and the bottoms of the water falling tubes are connected to the lower part of the outer cylindrical shell; and the upper part of the outer cylindrical shell is provided with a precipitating and filtering area, a filler layer is arranged in the precipitating and filtering area, a water outlet weir is arranged surrounding the filler layer, the water outlet weir is provided with water outlets, and the bottom of the outer cylindrical shell is provided with a mud outlet.

The invention discloses a nano iron phosphate micro chemical preparation method and nano iron phosphate. The method comprises the following steps of: S1, respectively dissolving soluble iron salt and phosphate into deionized water according to a ratio that Fe: P=1:(0.8-1.2), wherein the concentrations of solutions are both 0.1-1mol / L, and the final volume parts of an iron salt solution and a phosphate solution are the same; S2, weighing and dissolving a surfactant which can theoretically generate 1wt.%-10wt.% of iron phosphate into the iron salt solution; S3, dropwise adding ammonia water into the phosphate solution, and regulating the pH to be 8-10; S4, regulating the rotation speed of a mechanical pump to be 10-300 rounds / minute, simultaneously adding the same flow of the iron salt solution and the phosphate solution into a microreactor of a micro chemical system to react for 10-60 minutes, and thus obtaining a turbid liquid; and S5, filtering and separating the turbid liquid, washing and drying at 70-90 DEG C so as to obtain spherical nano iron phosphate. The method can be used for preparing the nano iron phosphate with regular shape, good dispersibility, uniform size distribution and high reactivity.

The invention discloses a method for continuously and quickly preparing propargyl alcohol by using a micro-reactor. The preparation method comprises the following steps: firstly, under anhydrous and anaerobic conditions, adding magnesium metal, elemental iodine and a solvent into a reactor, uniformly stirring the components, dropwise adding halogenated hydrocarbon, continuously stirring the components, and reacting to obtain a hydrocarbyl magnesium halide Grignard reagent; in a micro-reactor, with prepared alkyl magnesium halide and acetylene as raw materials, carrying out a Grignard exchangereaction under a continuous flowing condition to obtain ethynyl magnesium halide; and carrying out nucleophilic addition reaction on acetenyl magnesium halide and formaldehyde serving as raw materialsunder a continuous flowing condition to prepare propargyl alcohol. The method has the characteristics of rapid and continuous preparation of propargyl alcohol, simple operation, continuous and controllable process, mild conditions, and realization of industrialization.

The invention discloses a method for continuously and rapidly preparing N-phenylthiophosphoryl dichloride by utilizing a micro-reactor. In a microstructure reactor, thiophosphoryl chloride and anilineare used as raw materials, and a nucleophilic addition reaction is carried out under a continuous flow condition; and a crude product is subjected to separating and purifying to obtain the high-quality N-phenylthiophosphoryl dichloride. The method has the characteristics of rapid and continuous preparation of N-phenylthiophosphoryl dichloride, simple operation, continuous and controllable process, mild conditions, good product selectivity, and capacity of realizing industrial production.

The present invention discloses one kind of pre-filming flow nozzle, stillpot with the nozzle and the production process of superfine particle in the stillpot with the nozzle. The nozzle includes casing, pre-filming unit, flow channel, ring gap flow channel, etc. and has the structure with greatly lowered flow resistance on solution and less jamming caused by the solute particle. The stillpot has simple structure, convenient operation, light labor strength and excellent sealing effect owing to the C-shaped metal sealing part with upper and lower sealing planes in linear contact state. By means of the supercritical fluid forced dispersing solution process in the stillpot with the nozzle, superfine solute particle may be prepared.

The invention discloses a slow-release compound repair material for treating chlorine-containing organic pollutants in groundwater and a preparation method thereof. The preparation method comprises the steps of (1) preparing biochar by high-temperature pyrolysis; (2) pretreating zero-valent iron by acid pickling; and (3) adding water into the biochar, adding xanthan gum and an organic carbon source, adding zero-valent iron finally, and carrying out multi-step treatment on the obtained mixture so as to obtain a slow-release compound repair material for treating chlorine-containing organic pollutants in groundwater. According to the invention, by using the xanthan gum with high mechanical strength and strong mass transfer performance as a novel slow-release embedding agent, the biochar (as a physical adsorbent), the zero-valent iron (as a chemical reductant) and the organic carbon source (as a biological reductant) which are taken as effective components are compositely embedded so as to form constitutionally stable gel microspheres, and the slow-release compound repair material has the advantages of long-term slow-release, easy operation, low cost, environment friendliness, and the like, and can effectively realize the physical, chemical and biological synergistic reinforced repair, therefore, the material can remove target pollutants more efficiently.

The invention discloses a multilayer acute angle membrane type wall vibration folding high-efficiency particle heat exchanging device. The multilayer acute angle membrane type wall vibration folding high-efficiency particle heat exchanging device comprises a base, a boiler body located above the base and a plurality of acute angle membrane type wall structures. A plurality of vibrating springs arefixedly arranged between the boiler body and the base, and the base is provided with a vibration motor. A feeding port is formed in the boiler body. A feeding hopper communicates with the feeding port. The feeding port is provided with a feeding valve. A discharge port is formed in the lower end of the boiler body and provided with a discharging valve and a discharging hopper. The multilayer acute angle membrane type wall vibration folding high-efficiency particle heat exchanging device is relatively wide in material shape application range and particle size range and also adapts to non-circular particle particles. The materials flow from top to bottom, a working medium in a water pipe flows from bottom to top, good countercurrent is formed between the materials and the working medium, and gradient utilization of waste heat is advantageously achieved. The materials roll down, the gravity of the materials provide part of falling power, and the power consumption is relatively small. Themass transfer in the materials is powerful, and the heat exchanging coefficient of the materials and the inner walls of the boiler body is high.