217results about How to "Increase water content" patented technology

A method for producing a catalyst, in particular for the selective reduction of acetylenic compounds in hydrocarbon streams. An impregnation solution is provided, which contains a mixture of water and at least one water-miscible organic solvent as solvent in which at least one active metal compound and also preferably at least one promoter metal compound is dissolved. A support is provided, the support is impregnated with the impregnation solution, and the impregnated support is calcined. Palladium is preferably used as active metal and silver is preferably used as promoter metal. Also, a catalyst as is obtained by the method and also its preferred use for the selective hydrogenation of acetylenic compounds.

The invention discloses a selenium-enriched rice planting method. The method includes the following steps of land selecting, field finishing, seed treatment, sowing and seedling raising, seedling transplant, fertilizer management in the later period, irrigation treatment and selenium-enriched rice harvesting. Before seedlings are transplanted, selenium-enriched base fertilizer in a complex state is applied in the rice field, and a certain selenium source is provided for rice; at the beginning of panicle emergence and flowering of rice and grouting, the selenium-enriched compound fertilizer is applied in the rice field again, the selenium-enriched fertilizer is evenly distributed around roots of the seedlings in the growth process, the selenium in a complex state from soil is absorbed by the roots of the plants and then enters the inner cycle systems of the plants and participates in synthesis of protein through the path from stems to leaves to flowers and fruits, and finally, the selenium in an ionic condition from soil is stored in the seeds in the form of selenoprotein. The selenium-enriched rice tastes good and is high in nutrient matter content, and the content of the selenium of the rice can reach over 0.2 mg / kg and meets the national selenium-enriched standard.

The invention relates to a production method of whole wheat flour, solving the problems that wheat bran is difficult to crash, deficient in nutrient component utilization and shorter in shelf life. The production method of the whole wheat flour comprises the following steps: clearing wheat material, removing impurities in the wheat material, then rinsing to obtain wheat grains, carrying out heat treatment for sterilizing, killing enzyme and drying, and then crashing the wheat grains, wherein various known treating methods, such as a microwave heating method or a hot-air drying method can be adopted in the heat treatment method. As the optimal schemes, the water content of the rinsed wheat grains is 15-20 percent, and the water content of the wheat grains subject to heat treatment is below 14 percent. The invention has the advantages that: (1) the process flows are shortened; (2) the quality of the wheat bran is ensured by the rapid heat-moisture treatment, the shelf life is prolonged, and the problem that the wheat bran is difficult to crash is also solved; (3) the nutritional components in the whole wheat flour are stabilized, and the nutritional value of the product is improved.

A hydrogel electrolyte thin film is disclosed. The hydrogel electrolyte thin film comprises cross-linked macromolecular matrix materials and an electrolyte water solution; the macromolecular matrixes are mutually connected through chemical crosslinking to form space net structures; the electrolyte water solution is filled in the gaps of the space net structures; the macromolecular materials are poly (vinyl alcohol) or gelatin; and the electrolyte water solution is acid or salt electrolyte water solution. The hydrogel electrolyte thin film is prepared by a adopting a chemical crosslinking-casting film forming method or a chemical crosslinking-blade coating film forming method. The thin film is used for the gel electrolyte of flexible supercapacitors.

The invention relates to a preparation method for ZSM-5 molecular sieve membrane with high hydrophobicity, which comprises the following steps: (1) preparing a compact molecular sieve seed crystal layer; (2) putting a porous support with the molecular sieve seed crystal layer into a high pressure crystallized kettle, adding synthetic solutions, carrying out at least twice hydrothermal synthesis to promote full crosslinking growth between the molecular sieve seed crystals so as to finally form a complete molecular sieve membrane with orientation; and (3) adopting self catalysis property of heteroatom-containing ZSM-5 molecular sieve, adopting a hydrogenation deep catalytic cracking process to remove organic templates in the molecular sieve membrane under the lower temperature. The invention can effectively avoid the formation of intercrystalline defects of the molecular sieve membrane, also enables the cracked organic templates to form a single-walled carbon nano tube in the pore canal of the molecular sieve membrane, increases the hydrophobicity of the molecular sieve membrane, has mild process condition, simpler operation, lower cost and wide applicability, is not only suitable for planning production of the molecular sieve membrane, but also is benefit for the industrialization of the membrane separation technique with lower energy consumption of organic matter aqueous solution with low concentration.

The invention discloses a soil-conditioning type fertilizer. The fertilizer is prepared from following raw materials in parts by weight: 32-36 of rapeseed cake, 22-24 of furfural residue, 20-24 of gypsum, 19-23 of lime, 4-6 of vermiculite, 3-5 of molybdenum tailings, 5-7 of dolomite, 9-11 of diatomite, 7-10 of anthracite, 4-5 of calcium ammonium nitrate, 2-3 of copper sulfate, 1-2 of zinc sulfate, 1-2 of ferrous sulfate, 1-3 of manganese sulfate, 3-6 of a humate, 12-13 of a soil conditioner and a proper amount of water. The rapeseed cake, the furfural residue, and other raw materials are adopted by the soil-conditioning type fertilizer. The raw materials are convenient to take, low in cost and rich in nutrition, and capable of improving the soil structure. The vermiculite has good cation exchange property and absorptivity, and is capable of conditioning the soil structure, enhancing air permeability and water retention of the soil, allowing the acid soil to change into neutral soil, and allowing slow release of the fertilizer in crop growth media. In addition, the vermiculite can provide self-containing K, Mg, Ca and Fe, and trace Mn, Cu, Zn, and other elements for crops. The furfural residue can effectively restore the soil, and overcome pollution of furfural residue solid waste to the environment in the soil restoration process. The furfural residue solid waste is utilized reasonably, thus achieving resource utilization of pollutants. The molybdenum tailings, the dolomite, the diatomite, the anthracite, and other raw materials are added for supplement, thus fully utilizing resources, reducing the production investment and reducing pollution caused by chemical fertilizers.

The invention relates to a Purified Terephthalic Acidproduction method with low energy consumption, low material consumption and low refuse discharge. The PTA production method comprises the following steps: tail gas of an oxidation reactor is outputted and passes through by-product steam of a first stage steam generator and is sent to an acetic acid regeneration tower for recycling acetic acid; a refined mother liquor is returned to the acetic acid regeneration tower, the original vacuum filtration filter is replaced by a pressure filter, and filter cakes are directly pulped and supplied to a refining section; through recovered acetic acid recovery extraction, an oxidized mother liquor is processed by extraction, and an acetic acid methyl ester removed tower top backflow liquid of the acetic acid regeneration tower is used for oxidizing, washing filter cakes of the refining section and blending slurries of the refining section. The method and system provided by the invention can effectively control acetic acid consumption in tail gas and waste water, recycle organic matters of the refined mother liquid, realize reuse of water, reduce consumption of steam and electric energy, reduce refuse discharge, and also can supply benzoic acid, mixed phthalic acids and other by-products. The invention has the advantages of short process flow, good operationality, low production cost and low apparatus investment.

The invention relates to a saline-alkali soil conditioner, and a preparation method and application thereof. The saline-alkali soil conditioner is composed of a carrier component and a biological active component, wherein the carrier component comprises pumice stone powder, medical stone powder, vermiculite powder, desulfurized gypsum and steel slag in steel making; microbial active components comprise niacin, p-aminobenzoic acid, inositol, serine, vitamin B1, vitamin B2 and glucose which are uniformly mixed to form the biological active component; and the mass of the microbial active components accounts for 8-12% of the mass of the carrier component. The saline-alkali soil conditioner can reduce the concentration of saline alkali around a plant root system, and also can inhibit the circulating damage to a crop root system after the underground deep saline alkali returns upwards, thus creating a favorable ecological environment for the crop root system.

The invention relates to a bone meal containing fertilizer and a preparation method therefor, and belongs to the technical field of fertilizer. The bone meal containing fertilizer is prepared from the following raw materials in parts by weight: 8-13 parts of bone meal, 6-10 parts of humic acid, 5-8 parts of distiller's grains, 7-12 parts of cassava residues, 5-10 parts of edible fungus residues, 47-55 parts of livestock manure, 3-5 parts of orange peel, 0.5-1 part of expanded vermiculite, 20-25 parts of crop stalk power, 3-5 parts of potassium chloride and 4-6 parts of superphosphate. The prepared fertilizer has comprehensive nutrients, and has stable and long-lasting fertilizer efficiency. By applying the fertilizer to crops, the crop production cost is reduced; the crops are promoted to mature early; the crop quality and the soil properties are improved; the formation of a soil granular structure is promoted; the soil is enabled to become soft; the soil structure is improved; and the soil fertility is also improved.

The arene extracting, rectifying and separating process includes pre-distilling arene containing mixture to prepare C6-C7 fraction and C8 fraction; introduing the C6-C7 fraction to middle part of extracting and rectifying tower to contact with selective solvent introduced from upper part for extraction and rectification; introducing the tower bottom effluent to recovering tower for separating arene from the solvent; separating the top effluent from the extracting and rectifying tower to obtain non-arene exhaust system and injecting water into poor solvent; condensating the top effluent from recovering tower to separate arene system while introducing water to recovering tower for re-use; and returning the bottom obtained poor solvent from the recovering tower to extracting and rectifying tower for reuse. The said process is suitable for recovering high purity benzene and toluene from hydrocarbon mixture with high arene content and has simple operation and low power consumption.

The invention discloses an air humidifier with a purification function. The air humidifier comprises a shell body, wherein a water tank is arranged at the lower part in the shell body, and an evaporator part and a water distribution structure are further arranged in the shell; the evaporator part is located above the water tank, and the lowest position of the evaporator part is higher than a highest liquid level in the water tank; and a fan assembly is arranged at the upper end of the shell body, an air inlet is formed in the side wall of the shell body, an air outlet is formed in the upper part of the shell body, and the air outlet is arranged above the fan blades of the fan assembly. The air humidifier aims to solve the problems that the humidification rate in a unit volume is not high and the humidification effect is not easy to control in an existing humidifier.

The utility model relates to a tubular dryer, which comprises a dryer cylinder (1), a supporting device (8) and a driving device (5) of the cylinder; wherein, an inlet for particles to be dried, an inlet pipe (4) for heating steam and an air inlet (3) are arranged at the inlet end of the cylinder; a particles outlet (10), an outlet pipe (12) for the heating steam, and an outlet (9) for gas and dust are positioned at the outlet end of the cylinder; the dryer cylinder is slantingly supported on the supporting device; the driving device (5) is arranged near the end of the dryer cylinder (1) for driving the dryer cylinder (1) to rotate; the inlet pipe (4) for the heating steam is connected with the inlet end of a central tube (16) in the middle of the dryer cylinder via mechanical seal; a plurality of holes are arranged on the wall of the central tube for the heating steam to enter the space between the outer wall of the heating central tube and the inner wall of the dryer cylinder; a baffle is arranged at the intermediate back part of the central tube; the other end of the central tube is connected with the outlet pipe for the heating steam via mechanical seal; a plurality of drying pipes (7) are positioned along the axial direction of the dryer cylinder in the space.

The invention provides a membrane electrode assembly of a fuel cell. The membrane electrode assembly comprises a gas diffusion layer, a micro-porous layer, a catalysis layer and an electrolyte membrane which are successively overlapped; in a direction of an air flow path, the thickness of the micro-porous layer is gradually reduced, the thickness of the catalysis layer is gradually increased, andthe total thickness of the micro-porous layer is consistent with the total thickness of the catalysis layer. The invention also provides a production method of the membrane electrode assembly of the fuel cell. The membrane electrode assembly of the fuel cell has the functions of balancing the content of water in areas of a gas inlet and a gas outlet of the fuel cell, finally improving the stability of the fuel cell under various temperatures and humidities, improving durability, reducing the catalyst loading capacity, and the like.

The invention provides a microporous layer structure of a fuel cell. The microporous layer structure comprises a high water-permeable microporous layer and a low water-permeable microporous layer which are arranged in an overlapped manner in sequence; along the direction of an air flow path, the thickness of the high water-permeable microporous layer is increased progressively, the thickness of the low water-permeable microporous layer is decreased progressively, and the total thickness of the microporous layer structure keeps consistent; at an air inlet, the thickness of the high water-permeable microporous layer is greater than that of the low water-permeable microporous layer, and at an air outlet, the thickness of the high water-permeable microporous layer is smaller than that of the low water-permeable microporous layer. The invention also provides a preparation method of the microporous layer structure and an anode assembly of the fuel cell. According to the microporous layer structure of the fuel cell provided by the invention, the water content of a gas inlet area and the water content of a gas outlet area in the fuel cell can be balanced, and finally, the stability of thefuel cell at various temperatures is improved, so that the functions such as durability are improved.

The invention relates to lightweight high-strength ceramsite concrete as well as a preparation method and application thereof, and relates to the field of building materials. The ceramsite concrete iscomposed of the following components in parts by weight: 400 to 530 parts of a cementing material, 420 to 460 parts of coarse aggregate, 650 to 850 parts of fine aggregate, 6.8 to 21 parts of admixtures, and 160 to 220 parts of water, wherein the coarse aggregate is fly ash ceramsite, the fine aggregate is composed of furnace slag and sand, and the admixtures include a polycarboxylic acid water reducing agent and an enhancing agent. The method uses ultra-fine modified fly ash, cement and activated silicon micropowder as the cementing material, the furnace slag and the river sand as the fine aggregate, and the fly ash ceramsite as the coarse aggregate to prepare the lightweight high-strength prefabricated component, and effectively solves the problem of ceramsite concrete layering due to asmall ceramsite density, and the prepared ceramsite concrete has high strength, is convenient for actual construction operation, and effectively uses solid waste, thereby facilitating environmental protection.

The invention belongs to the technical field of flue-cured tobacco cultivation, and particularly relates to a dry field flue-cured tobacco transplanting method. The transplanting method comprises the steps of soil preparation, hole digging, film covering, transplanting, water pouring, film uncovering and earthing up, and fertilization. According to the dry field flue-cured tobacco transplanting method provided by the invention, after hole digging and film covering, rainfall can be effectively collected in a precipitation process, and rainwater flows into holes along hole walls, and penetrates underground through reserved holes, so that the soil aquosity is increased, thus being beneficial to soil moisture conservation and transplanting; the application of bran with drugs can effectively prevent underground pests from biting roots and stems of tobacco seedlings, so that the survival rate of the tobacco seedlings is improved; and a ridging step is omitted before transplanting, and 1 field laborer can be reduced per mu of tobacco field, so that the labor cost is saved.

The invention discloses a chinaberry seed nursery stock insecticide fertilizer prepared from the following raw materials: by weight, 30-40 parts of rapeseed cake, 30-40 parts of soybean meal, 40-50 parts of pine needle powder, 50-60 parts of cassava dregs, 40-50 parts of peat, 50-60 parts of vermiculite, 20-30 parts of medical stone, 50-60 parts of urea, 20-25 parts of potassium bicarbonate, 10-12 parts of potassium chloride, 1-2 parts of sodium humate, 2-3 parts of manganese sulfate, 3-4 parts of zinc sulfate, 2-3 parts of ferrous sulfate, 1-2 parts of sodium selenite, 1-2 parts of stellera chamaejasme powder, 10-12 parts of chinaberry seed, 6-9 parts of an EM bacteria agent, 10-15 parts of a soil conditioner, and a right amount of water; The chinaberry seed nursery stock insecticide fertilizer uses the raw materials which are mostly natural substances, has the very good economic and environmental benefits, is rich in nutrition, and is capable of insect killing, sterilization, soil improvement and the like.

The invention relates to polyether polyol used for polyurethane single-component grouting materials and a preparation method and application thereof. The method mainly overcomes the defects that the water covering amount of polyether for original polyether grouting is small, and the strength of solidified bodies formed through reaction between polyether and water is low. The method includes the following steps that initiating agents and solid catalysts are input and mixed and are heated and dewatered after being evenly stirred, EO / PO is introduced, and aging is performed after material introduction ends; cooling is performed, water and neutralizers of phosphoric acid are added, neutralizing and stirring are performed, aluminum silicate adsorbents are added, low boiling matter and water in crude ether are removed through temperature raising vacuumizing, and finished products are obtained through press filtration after water content is analyzed to be qualified by central control analysis.

The invention provides a saline-alkali soil improving matrix and a preparation method thereof. The improving matrix is prepared from, by weight, 80-100 parts of wood processing waste, 40-50 parts of duck manure, 2-5 parts of monoammonium phosphate, 25-35 parts of calcium phosphate, 15-25 parts of flue gas desulfurization gypsum, 20-30 parts of vermiculite, 10-20 parts of perlite, 30-40 parts of furnace ash and slag, 120-130 parts of hydrolytic polymaleic anhydride and 1-2 parts of yeast. The saline-alkali soil improving matrix solves the problem that wood processing waste, flue gas desulfurization gypsum and furnace ash and slag cause environment pollution. Water-logged compost fermentation is conducted on the wood processing waste and duck manure by means of a microorganism fermentation agent. Physical and chemical properties of saline-alkali soil and soil microorganism living environments are improved by means of the organic matrix, a series of problems such as deterioration of physical and chemical properties of soil, nutrient unbalance, soil physical structural damage, acidification, hardening, release of toxic substances and the like caused by blindly applying an excessive amount of fertilizer are avoided, good economic benefits can be obtained, and unnecessary loss is avoided.

The invention discloses a method for constructing a rocky backward slope vegetation. The method comprises the following steps of step 1, processing a backward slope surface of an original rock body; step 2, driving an anchor rod in the original rock body, and hanging a geonet on the backward slope surface; step 3, forming a ceramsite vermiculite concrete layer on the backward slope surface, forming a porous planting layer, and modifying the backward slope surface into a positive slope; step 4, laying an active protective net on the surface of the positive slope, and constructing a reinforced layer, treating a base surface of the positive slope with a vegetation concrete, and forming a vegetation concrete anti-scour layer; step 5, planting the vegetation on the surface of the vegetation concrete anti-scour layer to form a cross-vegetation layer of herb shrubs; step 6, conducting post conservation. The method maintains the stability of the slope through the anchor rod, the surface support and an SNS active net, and repairs a slope ecology.

The invention relates to novel, stable bi-molecular cationic inverse emulsion polymers (W / O) with both different molecular weights and cationic activities that are assembled via an “in situ” emulsion polymerization of a high molecular weight cationic polymer in the presence of a low molecular weight polymer in the aqueous phase. The low molecular cationic polymer is produced in a pre-polymerization in solution. The novel, stable cationic water-in-oil emulsion is easy invertible and useful as flocculant, dewatering aid and retention aid in papermaking.

The invention relates to a runner humidifying vertical plasma and absorption purifying air handling device, comprising a shell body; wherein, the shell body is internally provided with a runner humidifying chamber, a plasma purifying chamber and an absorption purifying chamber from the bottom up in turn; the runner humidifying chamber is internally provided with an annular humidifying runner, and the bottom thereof is a water tank which can submerge the bottom of the humidifying runner; the plasma purifying chamber is internally provided with an earthing electrode and a discharge electrode; the earthing electrode is barrel-shaped and is connected with a power ground; the discharge electrode is baculiform; the surface of the discharge electrode is evenly provided with a plurality of discharge pricks and is connected with an output end of a high-frequency power supply; the earthing electrode and the discharge electrode are arranged together by an insulated bracket; an absorbing material layer is arranged in the absorption purifying chamber; the absorbing material of the absorbing material layer uses porous materials, while the activated carbon fiber with precious metal and cold accelerant is preferred. The invention features relatively simple structure, good purification effect and capacity of regulating humidity of indoor air, thus being mainly applied to purification and humidity regulation of indoor air and other similar air.

The present invention discloses one process of preparing hydrogen with biomass fast cracking oil. The biomass fast cracking oil as main material and the Ni / Al2O3 catalyst are water vapor catalytically reformed under proper reaction temperature, reaction pressure, reaction time and other technological conditions to prepare synthetic gas with rich hydrogen content. The present invention provides one new way for producing hydrogen and lays foundation for the subsequent processing of biomass cracking oil and the development of biomass resource.

The invention relates to an adsorption air-purification device equipped with spray and bubbling washing vertical plasma, which comprises a shell body, the shell body is internally provided with a washing room, a plasma purification room and an absorption purification room from the bottom to the top in turn, wherein a water tank is arranged at the lower part of the washing room, a spray pipe is arranged on the top of the water tank, an orifice plate positioned under the water line is arranged in the water tank; the plasma purification room is internally provided with an earth electrode and a discharge electrode; porous materials are used in the absorbent materials of the absorption material layer, activated carbon fiber with precious metal cold catalyst is selected in preference; a vertical air inlet pipe and a water storage tank are arranged at the sides of the shell body respectively; the lower part of the vertical air inlet pipe is communicated with the water tank; a plurality of spray heads are arranged on the spray pipe; a diving pump connected with the spray pipe is arranged in the water storage tank; close-type overflow structure is arranged on the side wall connected by the shell and the water storage tank. The adsorption air-purification device has a relatively simple structure, which is mainly used for purification and humidifying of large-scale indoor air, and pollution control of the industrial exhaust gas.

The invention relates to resistance preparations of crops and use methods therefor, particularly relates to a compound preparation for improving drought resistance of wheat and a use method therefor and belongs to the technical field of agriculture. The compound preparation consists of plant nutritional agents, plant growth regulators, a chemical induction resisting agent, an adjuvant and water, wherein the plant nutritional agents consist of composite amino acid, a zinc salt, a ferric salt, boric acid or salts thereof, the plant growth regulators consist of compound sodium nitrophenolate and cycocel, the chemical induction resisting agent is salicylic acid, and the adjuvant is a mixture of ethanol and glycerine. The compound preparation disclosed by the invention can be used for improving and supplementing nutrition and reducing transpiration, so that the relative water content of leaves under adverse circumstances is increased, the damage to cell membranes under the adverse circumstances is reduced, and then, the photochemical efficiency under the adverse circumstances is increased; and after the compound preparation is used, the drought resistance of the wheat can be remarkably enhanced, and the wheat can maintain normal growth and development and achieve relatively good yield and quality.

The invention belongs to the technical field of potato breeding, and particularly relates to a method for manufacturing potato breeder's seeds. The method comprises the steps of disinfecting, watering, transplanting, pesticide applying, laminating, stem pressing, temperature management, water management, spindling control, harvesting and the like. An adopted seedbed matrix adopts solid medium particles for replacing vermiculite, a waste culture medium in the seedling production process is added into adopted organic fertilizer, the seedbed cost is lowered by 15-20%, and the yield of the breeder's seeds can be increased to a certain degree; on one hand, the per unit output breeder's seed production cost is lowered; on the other hand, the purpose of after-treatment of the waste culture mediumis achieved.

The invention relates to the technical field of soil remediation, in particular to a remediation agent and remediation method for heavy metal contaminated soil. The remediation agent for the heavy metal contaminated soil comprises 2-16 parts of humic acid, 5-10 parts of succinic acid, 5-20 parts of sawdust, 2-10 parts of bentonite, 10-20 parts of sodium polyacrylate, 5-10 parts of honeycomb briquette ash, 5-20 parts of seaweed residues, 2-10 parts of zeolite, 5-10 parts of nano hydrogel, 10-30 parts of charcoal, 10-20 parts of Fe-Mn binary oxide, 5-10 parts of sodium pyrophosphate and 2-10 parts of microorganism mixed bacteria. The remediation agent is good in repairing effect and low in cost. The remediation method for remediating the heavy metal contaminated soil through the remediationagent is simple, heavy metal in the soil can be efficiently solidified, and the water quality grade of the soil penetrating fluid is improved.

The invention discloses application of sodium hydrosulfide and melatonin combination serving as a plant drought-resistant agent. According to the application, NaHS and melatonin are prepared into water solutions for utilization respectively, wherein the concentration of a NaHS water solution is 5 to 80mumol*L<-1> and the concentration of a melatonin water solution is 50 to 100mumol*L<-1>; uniformly applying the prepared water solutions on surface of plant leaves in sequence so as to extremely remarkably promote the closing of air pores and improve the relative water content of the leaves, andfurther alleviate damages, caused by drought stress, to plants. The application has the advantages of low cost, safety and no toxicity, simplicity in operation and remarkable effect; in order to solvethe drought-resistant problem in agricultural production, the invention provides a practical and effective method.

The invention relates to a constructed wetland compound gravel bed which solves the problems that for an existing constructed wetland gravel bed, the interception effect is poor, and nitrogen and phosphorus in sewage can not be removed. The constructed wetland compound gravel bed is composed of a growth matrix layer and a filler layer, the growth matrix layer is located on the upper portion of the filler layer, the growth matrix layer is a mixture of soil and vermiculite, and the filler layer is composed of a gravel section, a zeolite section and a volcanic rock and gravel mixed section from the direction of a water inlet to the direction of a water outlet in sequence. According to the constructed wetland compound gravel bed, the COD removal rate is higher than 50 percent, the removal rate of total nitrogen and the removal rate of total phosphorus are both over 60 percent, and the constructed wetland compound gravel bed can be used for conducting interception on the sewage in the constructed wetlands.

The invention relates to a method for separating a methanol / methyl methacrylate mixed system, which is implemented by adopting a pervaporation process of a Beta molecular sieve membrane. In the method for preparing the Beta molecular sieve membrane for separating the methanol / methyl methacrylate mixed system, the dense and continuous Beta molecular sieve membrane is prepared by adopting a secondary growth method under the condition of high water-silicon ratio and the use of a cheap template agent. The Beta molecular sieve membrane prepared on tubular supporting bodies of various materials hasa good shape-selective separation effect and meets the requirement of separating the methanol from the methanol / methyl methacrylate mixed system. When the Beta molecular sieve membrane prepared underan optimized condition is used for performing pervaporation on the 60-DEG C methanol / methyl methacrylate (with mol percentage of 50:50) system, and the flux and the separation factors are more than 0.50 kg / m<2>*h and 650 respectively. The continuous Beta molecular sieve membrane with dense crystal is prepared through a series of test on synthesis steps of a seed crystal coating method, a formula of raw materials, a reaction condition and the like, so the method for separating the methanol / methyl methacrylate system is determined.