130results about How to "Rapid solid-liquid separation" patented technology

The invention discloses a preparation method of large-size graphene oxide or graphene. The preparation method mainly utilizes graphite as a raw material and comprises that 1, under the action of an intercalator and an expanding agent, graphite fully releases interlayer spaces so that interlayer interaction is reduced and a graphene aggregate is obtained, 2, the graphene aggregate is oxidized by an oxidizing agent, and then the oxidized graphene aggregate is peeled in water under gentle mechanical action so that a large area of a dispersion liquid of graphene oxide is obtained, and 3, the peeled graphene oxide is reduced by a reducer or heat treatment so that high conductivity graphene is obtained. The preparation method utilizes cheap raw materials, has a simple process, can be controlled easily, realizes fast and high efficiency solid-liquid separation, is convenient for industrial large scale production, prevents graphene crystal structure destroy caused by high energy supersonic wave, high speed shearing or fluid crushing. The obtained graphene has a large size and high conductivity and can be popularized and used in fields of high efficiency heat management, flexible display, energy conversion and storage.

The invention discloses magnetic composite hydroxyapatite nanoparticles. The magnetic composite hydroxyapatite nanoparticles are composed of Fe3O4 nanoparticles and hydroxyapatite nanoparticles, wherein the molar ratio of the Fe3O4 to the hydroxyapatite is (1-10): 1; the magnetic composite hydroxyapatite nanoparticles are spherical aggregate or agglomerate in which the Fe3O4 nanoparticles and the hydroxyapatite nanoparticles are distributed evenly and alternately. The preparation method of the magnetic composite hydroxyapatite nanoparticles is simple; the nanoparticles are capable of efficiently removing heavy metal ions in sewage, and in the later treatment period, quick magnetic separation can be realized; the nanoparticles have the adsorbing capacity of 440mg / g to lead ions, the adsorbing capacity of 238mg / g to cadmium ions, the adsorbing capacity of 139mg / g to zinc ions and the adsorbing capacity of 135mg / g to copper ions in the sewage; the magnetic composite hydroxyapatite nanoparticles have a rapid magnetic response characteristic, and are capable of realizing rapid solid-liquid separation with an external magnetic field, and the separation process is high in separation efficiency, and simple and efficient to operate; and besides, the nanoparticles are not residual in water and do not cause secondary pollution to the water and the environment.

The invention provides a compound water treatment agent and a preparation method and an application of the water treatment agent. The compound water treatment agent comprises the following components in parts by weight: 48-70 parts of sodium bentonite, 8-15 parts of kieselguhr, 8-15 parts of zeolite, 6-10 parts of magnetic substance, 5-7 parts of chitosan and 3-5 parts of polyacrylamide. The preparation method of the compound water treatment agent is simple, and a material source is wide. With the adoption of the compound water treatment agent, heavy metal ions and organic contaminants in water can be removed while electrolyte concentration in the water can be lowered, and solid-liquid separation can be conducted quickly by virtue of a magnetic filter method. The compound water treatment agent can be applied to a pre-treatment process of a reverse osmosis system, facilitates increasing the water production rate of the reverse osmosis system, reduces operating pressure of the reverse osmosis system, and is significant in practical value and broad in market prospect.

The invention provides a method of biologically making restaurant and kitchen rubbishes into feed, including: solid-liquid separation and oil-water separation. The oil separated out is made into fatty acid calcium particles by emulsifying and hydrogenating. The water separated out is added to feed saccharomycetes to obtain a saccharomycetes-containing solution. The solid separated out is sterilized at high pressure and then mixes with the solution to ferment into the feed. The method is special, the process is novel, and the final product is economic and practical. It converts the restaurant and kitchen rubbishes to the feed that has high-added value fatty acid calcium and high protein. The whole course does not discharge any pollutant and has no secondary pollution. The feed obtained contains various physiological active substances, helpful for the domestic animals and fowls to digest and assimilate the feed, thus increasing the utilization rate of the feed.

The present invention is xanthated bentonite as one kind of metal ion adsorbent with high adsorption capacity and its preparation process. The metal ion adsorbent with high adsorption capacity is prepared with bentonite sodium as material, and through dispersing, alkalization, reacting with SO2, and treating with magnesium salt to form stable magnesium salt of xanthated bentonite. The xanthated bentonite has powerful adsorption on heavy metal ion, and may be used in treating waste water containing heavy metal ion. Treating waste water containing heavy metal ion with the xanthated bentonite has the features of simple operation, high speed, high metal ion eliminating rate, easy solid-liquid separation, etc.

The invention discloses an acidic iron-containing wastewater recycling system comprising a pickling wastewater storage pool, wherein the pickling wastewater storage pool is connected with a neutral oxidation reaction tank through a raw water acid proof pump, and a stirrer, a 1# online pH meter and a 1# online ORP (oxidation reduction potential) meter are fixed in the neutral oxidation reaction tank; an alkali liquor storage tank is connected with the neutral oxidation reaction tank through a 1# metering pump; a flocculant storage tank is connected with the neutral oxidation reaction tank through a 2# metering pump; the neutral oxidation reaction tank is connected with a settling tank through a slurry pump, the settling tank is connected with a sludge concentration tank, and a supernatant drain pipe is further connected to the settling tank; the sludge concentration tank is connected with a high pressure plate frame filter press through a high pressure slurry pump; and the neutral oxidation reaction tank is further connected with a blower. The invention further discloses an in situ modification method for treating wastewater by the acidic iron-containing wastewater recycling system. By adopting the acidic iron-containing wastewater recycling system disclosed by the invention, more than 55% of Fe3O4 can be stably prepared and recycled through in-situ reaction in an acidic wastewater neutralization tank under normal temperature and normal pressure conditions.

The invention relates to the technical field of wastewater treatment, and discloses an agricultural wastewater treatment device which comprises a tank body, a sleeve is fixedly connected to the center of the upper end of the tank body through a round opening, a sealing plate is fixedly connected to the upper end of the sleeve, a rotating shaft is rotatably connected to the center of the sealing plate through a first rolling bearing, a gear ring is fixedly connected to the shaft wall of the rotating shaft, the lower end of the rotating shaft penetrates through the first sealing bearing, extends into the sleeve and is fixedly connected with a spiral blade, a conical plate is arranged in the tank body, and the center of the conical plate is slidably sleeved with the wall of the sleeve through a circular hole. According to the agricultural wastewater treatment device, straw feed waste generated in the breeding process can be used as a filter material to effectively filter excrement residues and sludge in agricultural wastewater, the generated filter residues are convenient to clear and transport for secondary processing production, filtered sewage can be effectively stirred and flocculated, and the sewage treatment steps are effectively simplified.

The invention discloses a preparation method and application of a magnetic covalent organic framework compound for adsorbing triphenylmethane dyes. The invention belongs to the field of preparation ofmagnetic covalent organic framework compounds. The invention aims to solve the technical problems of complex operation and long reaction time of the existing method for synthesizing the covalent organic frameworks (COFs). The method comprises the following steps of: 1) preparing carboxylated magnetic nano (Fe3O4-COOH); and 2) synthesizing a magnetic covalent organic framework (Fe3O4-COOH(at)COF)on the surface of the magnetic nano material through a Schiff base reaction. The preparation method is simple, the synthesis time is short, and the synthesis only takes 3 hours at high temperature of120 DEG C. The prepared Fe3O4-COOH (at) COF has magnetic responsiveness, high specific surface area, high thermal stability and high adsorption performance (42.8 mg / g-500mg / g). According to the method, the triphenylmethane cationic dyes can be rapidly extracted from a complex sample within 10 minutes, so that multi-residue detection of the triphenylmethane cationic dyes can be realized, the pretreatment process of the complex sample is simplified, and the separation efficiency is greatly improved.

The invention discloses a method for recovering copper, cobalt and nickel from copper and nickel slag. The method comprises the following steps: leaching a soluble substance through ore grinding and powder concentration by using an acid, performing solid-liquid separation to obtain a leaching solution I and leaching slag I; oxidizing soluble metals in the leaching slag I, regulating the pH value, precipitating and separating the iron, and performing solid-liquid separation to obtain a separation solution II and separation slag II; continuously adding the copper and nickel slag into the separation solution II, regulating the pH value so as to ensure that soluble silicon is precipitated in a silicate form, and performing solid-liquid separation to obtain a separation solution III and separation slag III; finally, precipitating the copper, cobalt and nickel in the separation solution III by using sodium dimethyl dithiocarbamate and xanthate, and performing solid-liquid separation to obtain separation slag IV, namely the recovery product. According to the reasonable process design, common chemicals and methods are used, the copper, cobalt and nickel are recovered from the copper and nickel slag, the environment can be prevented from being polluted by waste residues, and rare metals such as copper, cobalt and nickel can be effectively recovered. Moreover, the product process parameters are easily controlled, and novel environmental pollution is avoided.

The invention provides a livestock and poultry breeding solid-liquid separation excrement cleaning device. The livestock and poultry breeding solid-liquid separation excrement cleaning device comprises an annular excrement collecting box; an excrement scraping plate is installed in the annular excrement collecting box; the excrement scraping plate is directly connected with a power driving mechanism or is connected with the power driving mechanism through a connecting piece; the excrement scraping plate is driven by the power driving mechanism to rotate around the annular excrement collecting box; the bottom plate of the annular excrement collecting box is an inclined plate; the lowest point of the inclined plate is located at the middle of the bottom plate; an urine discharging opening is formed at the middle of the bottom plate; and a solid excrement outlet is formed at the bottom plate of the annular excrement collecting box. According to the livestock and poultry breeding solid-liquid separation excrement cleaning device of the invention, after excrement falls into the annular excrement collecting box, solid-liquid separation of the excrement can be realized; solid excrement and liquid excrement are separately collected through different pipelines; the solid excrement is directly treated and is packaged; and the liquid can be adopted as secondary water after being purified; and therefore, excrement treatment procedures can be decreased, and treatment cost can be decreased, and underground space can be greatly saved. The livestock and poultry breeding solid-liquid separation excrement cleaning device of the invention is reasonable in integral design. The driving mechanism is arranged on the excrement scraping plate. The livestock and poultry breeding solid-liquid separation excrement cleaning device is especially suitable for annular comprehensive cultivation buildings and can realize fast and convenient solid-liquid separation treatment.

The invention discloses a combined leaching-stabilization rehabilitation method for soil contaminated by chromium residue. The method specifically comprises the following steps: remediation preparation, specifically, a leachate guide drainage structure is constructed, and the soil contaminated by the chromium residue is dredged, transported, broken, screened and piled; leaching remediation, specifically, a leaching agent is evenly distributed on the surface of a soil heap, the leaching agent separates chromium contaminants in the soil from top to bottom, a discharge port of the leachate is opened and the leachate is collected to a detoxification tank, hexavalent chromium is reduced and trivalent chromium is precipitated, and supernatant is used for circulating spray; and stabilization rehabilitation, specifically, the discharge port of the leachate is closed, stabilizer solution is added to a leaching tank until the soil is submerged, and the chromium contaminants remaining in the stabilized soil are soaked and stabilized by the stabilizer. By means of the combined leaching-stabilization rehabilitation method for the soil contaminated by the chromium residue, the leaching process and the stabilization process are organically combined, first, the total amount of the contaminants in the soil contaminated by chromium residue is reduced by spraying the leaching agent, and then theresidual contaminants are further removed by soaking the stabilizer, so that the amount of stabilizer addition is greatly reduced, and the environmental risk of the soil contaminated by the chromium residue is effectively eliminated.

The invention relates to a pressurization rotating drum filtering machine, which comprises a base and bearing seats, wherein a case consists of connecting flanges arranged at two ends and separation plates arranged in the middle, the separation plate is distributed in the circumference direction and forms a frame chamber with the connecting flanges arranged at two ends, the bearing seat is arranged at two ends of the case, the other side of the bearing seat is provided with a speed reducing gear, the inner side of the bearing seat is provided with a bearing, the speed reducing gear, the bearing and the bearing seat are respectively arranged on a left shaft joint, a sealing ring A is arranged between the left shaft joint and the case, a press ring is arranged between the left shaft joint and the bearing seat, the inner side of the case is provided with a sealing press plate, the other side of the sealing press plate is provided with an annular rib, the two sides of the annular rib are provided with filter cloth, one side of the filter cloth is provided with a sealing press plate, the other side of the filter cloth is provided with a filtering plate, and the other side of the filtering plate is provided with a base plate. The pressurization rotating drum filtering machine can be used for fast carrying out solid-liquid separation on various kinds of suspension materials, the continuous material discharge is realized, the processing quantity is great, the dewatering effect is good, and the operation environment is good.

The invention discloses an upper discharge device of a filtering tank, which comprises floating balls, a connection rack, a suction nozzle, a hose, a valve and a tank body, wherein the tank body is a closed container, the floating balls, the connection rack, the suction nozzle and the hose are arranged inside the tank body, at least three floating balls are fixed on the connection rack and float on the liquid surface, the suction nozzle is fixed on the connection rack, one end of the suction nozzle is inserted into the liquid surface, and the other end of the suction nozzle is communicated with a water discharge port on the upper part of the tank body through the hose. According to the filtering equipment and device applied to the fields of chemical industry and environment protection, after filtered liquid is settled, the clear liquid on the upper part is discharged by the upper discharge device, and residue and water separation is rapidly realized, so that the filtering efficiency is greatly improved.

The invention discloses a preparing method of a cesium ion adsorbing agent. The preparing method comprises the steps that firstly, carboxyl ferroferric oxide is prepared; secondly, carboxyl ferroferric oxide and a condensing agent are mixed, and a first mixture is obtained; thirdly, the first mixture is put into a solvent and stirred, an amination crown ether derivative is then added into the solvent, a reaction is carried out at the temperature ranging from 60 DEG C to 80 DEG C for at least 2 hours, and a second mixture is obtained, wherein the solvent is used for dissolving the amination crown ether derivative and the condensing agent; fourthly, the second mixture is subjected to solid and liquid separation, a first solid phase is obtained, cleaned and dried, and the cesium ion adsorbing agent is obtained. The invention further discloses the cesium ion adsorbing agent prepared through the method. The cesium ion adsorbing agent has high cesium ion adsorption selectivity and magnetism, and stable adsorption performance is maintained in the recycle use of adsorption and desorption. The cesium ion adsorbing agent can be applied to adsorption separation of cesium ions form radioactive nuclear waste, a polyion competing system and the like.

The invention discloses a method for extracting and purifying polyglutamic acid by adjusting the pH value to carry out fractional precipitation in the presence of ammonium sulfate. The method comprises the following steps: adding 30-60% (W / V) of ammonium sulfate into a fermentation liquid containing polyglutamic acid, adjusting the pH value to 6.0-8.0, removing the precipitate after stirring, andcollecting the glutamic acid clear solution; adjusting the pH value of the polyglutamic acid clear solution to be acidic, and collecting the glutamic acid precipitate; then re-dissolving the polyglutamic acid precipitate with water, adjusting the pH value to be alkalescent by using an alkali, carrying out ultrafiltration until conductivity of the permeate liquid is smaller than 5 ms*cm, and collecting the retained liquid; and adding activated carbon into the retained liquid for decolorization to obtain a colorless clear liquid, and carrying out drying to obtain a white polyglutamic acid solid.According to the method, polyglutamic acid can be effectively separated with other impurities, and use of organic solvents such as ethanol and the like is avoided. The purity of the obtained polyglutamic acid is high, and production cost is effectively reduced.

The invention discloses a high-flux magnetic solid-liquid separation device and a method thereof for purifying a magnetic particulate matter in wastewater. The device comprises an excitation system and a centrifugal sorting system, wherein a main body of the centrifugal sorting system is in the form of an inverted circular truncated cone and further has a sorting cavity which is of a double-layer structure of an inner cavity and an outer cavity; the top of the sorting cavity is provided with a material feeding opening and a purified water outlet; the bottom of the sorting cavity is provided with a magnetic material outlet and a driving device; the inner surface of the side wall of the inner cavity of the sorting cavity is provided with a magnetic medium; the excitation system comprises at least two groups of exciters; the exciters are uniformly distributed on the side surface of the exterior of the outer cavity of the sorting cavity. According to the device, a high-gradient magnetic field, a centrifugal force field and a gravitational field are organically combined; the device is applied to the purification of the magnetic particulate matter in the wastewater; the quick and high-efficiency separation of a superfine solid suspended matter can be realized; further, a method for treating the wastewater by utilizing the device is simple in process and convenient to operate; the industrialized production is realized.

The invention provides a sewage purification device capable of facilitating mud and water separation and belongs to the field of environment-friendly purification. The sewage purification device comprises a treatment cylinder, a center sleeve, a purification tank and a disinfection tank; the center sleeve passes through a center column, the outer wall of the center sleeve is fixedly provided withspiral blades, and the top of the center sleeve and the upper end inside the treatment cylinder are provided with reset springs; and a drain pipe is arranged at the lower end of the center sleeve, thelower end of the drain pipe is connected with a water pump by a connecting water pipe, the right end of the water pump is connected with the purification tank by a connecting water pipe, and the topside of the right side of the purification tank is connected with the upper end of the left side of the disinfection tank by a connecting water pipe. Uniform filtering holes are formed in the surface of the center sleeve, so that the device provided by the invention has a rapid solid-liquid separation function for sewage; the bottom of an inner cavity of the purification tank is provided with a dense filter screen, so that the device has a function of filtering and separating the separated sewage again; and the device has the characteristics of simple structure, strong practicability and good sewage purification effect.

The invention discloses a preparation method and application of a core-shell magnetic gamma-cyclodextrin polymer composite material. The composite material is composed of multiple layers of polydopamine (PDA) and cyclodextrin polymer (P-CDP) coating each other, wherein each P-CDP layer has a thickness of about 20 nm. The composite material disclosed by the invention uses PDA as a binder, and the cyclodextrin polymer can uniformly coat magnetic balls under the condition of water-bath heating and continuous stirring. Compared with a simple cyclodextrin polymer material, the composite material has magnetic property to make the solid-liquid separation simpler and faster, and has more adsorption sites through the uniform coating of the cyclodextrin polymer. The preparation process is simple, and the composite material has good separation and enrichment effect on microcystins, and has good application prospects in the fields of water environment analysis and aquaculture risk warning.

The invention discloses equipment for extracting dietary fiber from wheat bran. The equipment comprises a reaction device and a separation device, wherein the reaction device can be used for performing steaming boiling heating and modification on the wheat bran; the wheat bran mixed liquid after modification is completed enters the separation device to be subjected to centrifugal separation; water-soluble dietary fiber and water-insoluble dietary fiber are respectively obtained and are respectively fed into a spray drying machine and an ultrafine crushing machine to be made into dietary fiberpowder. The device provides a set of complete extraction equipment; the production process from raw materials to finished product has few steps; the efficiency is high; the fast industrial productionis facilitated; a novel path is provided for the further resource utilization of the wheat bran.

The invention relates to a biochar composite material and a preparation method thereof. The method comprises the following steps: firstly, preparing ramie stem powder; utilizing sodium humate to modify and carbonize, thereby preparing a biochar modified material; and loading magnetic particles onto the surface of the biochar modified material, thereby obtaining the biochar composite material. The prepared biochar composite material has better physicochemical properties and easiness in solid-liquid separation and reutilization. The prepared biochar composite material provided by the invention has a huge specific surface area, and the surface contains rich activegroups, so that the biochar composite material can be applied to various fields, and a more extensive approach is supplied for the reutilization of ramie.

The invention relates to a preparation method of a magnetic porous supermolecular cyclodextrin-adsorbing material, which comprises the following steps of 1) preparation of porous supermolecular cyclodextrin: in an inert atmosphere, adding an organic solvent into a mixture of beta-cyclodextrin, tetrafluoroterephthalonitrile and potassium carbonate, heating to 70 to 90 DEG C under the condition of stirring, then reacting at constant temperature for 20 to 40h, cooling to room temperature after the reaction is finished, then performing aftertreatment to obtain the porous supermolecular cyclodextrin; 2) preparation of magnetic porous supermolecular cyclodextrin: putting FeCl3.6H20, FeCl2.4H20 and the porous supermolecular cyclodextrin in a reactor, adding water, heating to 80 to 100 DEG C whilestirring in an inert atmosphere, reacting at constant temperature for 5 to 30min, then regulating the pH of reaction liquid to be 9 to 11, continuously stirring and reacting for 2 to 5h, cooling a product to room temperature, performing hysteresis separation to obtain black brown precipitate, washing the precipitate to be neutral, then performing vacuum drying to obtain the magnetic porous supermolecular cyclodextrin.

The invention discloses a method for treating pharmaceutical wastewater through a nanometer Fe3O4 Fenton-like technology, relates to a method for treating the pharmaceutical wastewater and aims to solve the problems that at present, pharmaceutical wastewater biochemical effluent COD can not reach the standard and is hard to remove further, and when an existing Fenton oxidation method and an existing Fenton-like method finish pH regulation through oxidation, the amount of produced iron mud is large, the coagulating sedimentation technology needs to be added. The method comprises the first step of regulating the pH value, the second step of adding nanometer Fe3O4 and hydrogen peroxide, the third step of stirring for reaction, and conducting magnetic separation on the pharmaceutical wastewater with the hydrogen peroxide through a direct-current electromagnet so that magnetically attracted nanometer Fe3O4 and liquid supernatant obtained after separation can be obtained, and the fourth step of regulating the pH value and conducting washing to obtain treated water and regenerated nanometer Fe3O4. The values of COD in the treated water are lower than 50 mg / L. The method is used for treating the pharmaceutical wastewater through the nanometer Fe3O4 Fenton-like technology.

The invention relates to a method for electrochemical preparation of hydrotalcite for in-situ treatment on a strontium-containing radioactive waste liquid in a power plant. The method comprises the following steps: preparing simulated radioactive wastewater with Sr<2+> as electrolyte, dropping an alkali solution and an acid solution, adjusting the pH value to be 5-11, and carrying out electrolysiswith double power supplies, wherein a direct-current voltage stabilizing power supply with an aluminum piece as an anode and graphite as a cathode is adopted as one group of the power supplies, and apulse power supply with two zinc pieces as an anode and a cathode respectively is adopted as the other group of the power supplies; alternating the anodes and the cathodes through inverse electrodes,carrying out electrolysis synthesis under a constant temperature condition, after the reaction is completed, leaving the electrolyte to stand, filtering, and carrying out solid-liquid separation, soas to complete simulation waste liquid purification treatment. By adopting the method, a great amount of chemicals or absorbents are not needed, only nitrate radicals and chloride ions of certain concentrations in the waste liquid need to be controlled, no secondary pollution can be caused, efficient removal of multiple divalent radioactive metallic ions can be achieved, and the method only aims at removal of strontium ions, is capable achieving efficient solid-liquid separation, is wide in material resource, simple in process and convenient to operate.

The invention discloses an unpowered rural sewage treatment device which structurally comprises a sewage treatment device, a device body, a water outlet pipe, supporting feet, a control cabinet, a water inlet pipe, a control panel and a top cover. The bottom of the top cover is fixedly connected with the top of the device body; the back of the control cabinet is vertically connected with the frontside of the device body, and the side face of the control panel is inlaid in the front side of the control cabinet; the left end of the water inlet pipe is connected with the interior of the device body in a communicating manner; the bottom of the device body is vertically connected with the top of the water outlet pipe; the sewage treatment device is arranged in the device body, and the supporting feet are connected into a triangular structure successively to array at the device body; the sewage treatment device is composed of a water inlet device, a filter device, a linkage device, a circulating extrusion device, an adjustment device, a manual device and an oxygen supply device; the unpowered rural sewage treatment device can rapidly perform solid-liquid separation on sewage and also can perform compression treatment on a separated solid, so that compressed excrement can be fertilized and used, and water also can have the quality improved by increasing the oxygen content.

The invention discloses a method for comprehensively recycling valuable metal from copper nickel slag. The method comprises the following steps: leaching iron out of raw material copper nickel slag by a step-by-step concentration difference leaching method, carrying out flotation enrichment on the leaching slag to prepare copper cobalt nickel bulk concentrate; selectively extracting iron from the leaching liquid by an extraction method to prepare iron oxide red, or precipitating the leaching liquid to prepare refined iron powder and water glass. By the method, high-grade copper cobalt nickel bulk concentrate, powdered iron, high-purity iron oxide red, high-modular water glass and other products are prepared with low cost. The method is environment-friendly and easy to operate and can realize continuous industrial production.

The invention discloses a modified magnetic alumina absorbent, a preparation method for modified magnetic alumina absorbent and an application of modified magnetic alumina. Fe3O4 is the core of the modified magnetic alumina absorbent. The surface of Fe3O4 nanometer particles is covered with SiO2. The surface of SiO2 is covered with Al2O3. By modifying Al2(SO4)3, the modified magnetic alumina absorbent is produced. The preparation method of the modified magnetic alumina absorbent includes preparing Fe3O4-SiO2 and preparing modified magnetic Al2O3. The modified magnetic alumina absorbent can be applied to remove phosphorus of effluent sewage. The modified magnetic alumina absorbent has the advantages of being efficient in absorbing phosphate and all the phosphorus and being convenient in recycling and using.

The invention discloses a method for treating landfill leachate tail water through magnetic carbon catalyzed ozonation, which belongs to the technical field of treatment of environmental waste. The method comprises the following steps: (1) biological treatment of landfill leachate; (2) preparation of a magnetic carbon catalyst; (3) catalysis of ozone for oxidation treatment; etc. According to the invention, the magnetic carbon catalyst is added, and adsorption performance and catalytic characteristics of the catalyst are fully utilized; therefore, under the synergism of adsorption and catalyzed ozonation, effluent reaches national discharge standards that COD is no more than 100 mg / L and chroma is no more than 40 times, and through utilization of the magnetic characteristics of a magnetic carbon material, the problems of separation, recovery and reutilization of the catalyst are overcome. The method provided in the invention can be popularized and applied in in-depth treatment of household garbage leachate tail water in town regions.

The invention discloses a preparation method of a hydrocracking catalyst. The preparation method comprises the following steps: (1) pulping raw material powder of a hydrocracking catalyst carrier component, performing high-temperature and high-speed stirring treatment while pulping, filtering, and drying a filter cake, wherein the hydrocracking catalyst carrier component comprises a molecular sieve, and further comprises at least one of aluminum oxide, amorphous aluminium silicon, amorphous magnesium silicon and clay; (2) shaping the dried material, drying, roasting for activating, and preparing into a catalyst carrier; (3) loading a hydrogenating active component by an impregnation method to obtain the hydrocracking catalyst. Compared with the prior art, the preparation method of the hydrocracking catalyst has the advantage as follows: by the preparation method, a synergistic effect between different components can be further promoted, so that the using performance of the catalyst is improved.

The invention belongs to the technical field of sewage disposal, and particularly relates to a heavy metal chelating agent. The heavy metal chelating agent comprises, by weight, 5-15 parts of sodium silicate, 25-35 parts of organic sulfides, 5-15 parts of sodium hydrosulfide, 2-8 parts of sodium aluminate and 32-60 parts of water. The materials have strong ion-exchange capacity and carry out a synergistic effect to show gathering capacity on heavy metal ions; the sediment is carried out rapidly, and after sewage is disposed, the solid-liquid separation is rapid, simple and convenient; the preparation technology is simple, and the operation is easy. The heavy metal chelating agent can effectively react with heavy metal chemically to produce an insoluble substance, and the chelating agent can nearly absorb all kinds of the heavy metal.

The invention discloses a preparation method of magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres. The preparation method comprises the steps of: dispersing carboxymethyl chitosan and Fe3O4 nano-particles into water to form a carboxymethyl chitosan-Fe3O4 mixed solution, adding the mixed solution into a cyclohexane-Span 80 system, adding a glutaraldehyde solution and mixing the solution evenly to prepare magnetic carboxymethyl chitosan microspheres; and dispersing the microspheres into water, adding [2-(methacryloyloxy)ethyl]trimethylammonium chloride under an initiation condition of an initiator to prepare magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres. The magnetic separation technique-based amphoteric carboxymethyl chitosan-based microspheres prepared by the method contain abundant quaternary ammonium groups, amino, hydroxy, carboxyl and the like, so that an adsorbent has an amphoteric character, can efficiently remove heavy metal cations, can also efficiently remove heavy metal anions, can be applied to a mixed system of the heavy metal cations and the heavy metal anions, and efficiently removes heavy metal ions in a mixed solution at the same time. The adsorbent can be recovered from the solution through a magnetic separation technique after adsorption is completed, and regeneration and utilization can be achieved after desorption, so that the economic cost is greatly reduced.