43results about How to "Improve filter adsorption effect" patented technology

A filter candle paper added with an adsorbent filling material, a paper-based filter candle and a preparation method. The filter candle paper contains cellulose diacetate, which is prepared by adding an adsorbent filling material into cellulose diacetate slurry from spinning and accounts for 1-99wt% in the paper; the filter candle paper also contains one or more of wood pulp fiber, cotton pulp fiber, bamboo pulp fiber and jute pulp fiber. The paper-based filter candle is processed by embossing, slitting and moulding the filter candle paper. A preparation method of the filter candle paper comprises steps of: adding the adsorbent filling material into spinning slurry from cellulose diacetate spinning and mixing well with the slurry; spinning cellulose diacetate by a dry method spinning technology; then milling the cellulose diacetate to short fibered pulp, mixing with one or more of the milled wood pulp fiber, cotton pulp fiber, bamboo pulp fiber and jute pulp fiber, and processing into paper. The filter candle paper of the invention has strong adsorptivity and can effectively reduce tar, solid particulate matter, nicotine and various other harmful components in cigarette flue gas and mitigate influenced of common paper-based filter candle on cigarette flavour.

The invention relates to a modified polyactic acid composition for a cigarette filter stick and a preparation method thereof. The composition comprises following parts of raw materials, by weight, 100 parts of polyactic acid, 0.02-3 parts of polyactic acid-beta-cyclodextrin, 0.08-5 parts of sodium carbonate, 0.05-5 parts of sodium pyrrolidonecarboxylate, 0.01-4 parts of vitamin and 0.01-8 parts of polyacrylamide. The filter stick prepared through the polyactic acid composition is better in absorbing performance on smoke compared with the prior art and good in comprehensive performance, and a part of indexes of the filter stick exceed those of a cellulose acetate filter stick.

The invention relates to a production device for non-woven cloth, in particular to a once formed composite production device for various melt-blown filter materials. The device comprises screw extruders, spray heads, an air supply device, a receiving net, an air suction device, a reciprocating vehicle capable of transversely moving to and fro, a cloth pressing roller, a balanced tension winding roller and an electret rack, wherein the number of the screw extruders is at least two, outlets of the screw extruders are connected with the spray head respectively, an outlet of the air supply device is connected with the spray head through a pipe, the receiving net is arranged on the reciprocating vehicle capable of transversely moving to and fro, the spray heads are arranged at the outside of the receiving net respectively, the inside of the receiving net corresponding to a close part of melt-blown fibers sprayed by the spray head is provided with the air suction device, the reciprocating vehicle is provided with the balanced tension winding roller matched with the receiving net and driven by a motor, and the adjustable cloth pressing roller is arranged between the balanced tension winding roller and the receiving net; and the outside of the receiving net close to the spray head is provided with the electret rack which is provided with a plurality of groups of high-pressure discharge brushes, and the reciprocating vehicle is arranged on a track which is grounded.

A meltblown composite production device formed by one-step molding relates to a production device of the nonwoven fabric, in particular to a composite production device formed by one-step molding of multiple meltblown filter materials. The production device comprises a rack, an automatic feeding device, screw extruders, spray nozzles, an air supply device, a receiving net, a suction device, a reciprocating trolley which can perform transverse reciprocating motion, a cloth-pressing roller, a balanced tension winding roller, an electret rack and a screw extruder automatic lift device, wherein the automatic feeding device contains a bin, a feeding pipe, a charging cylinder, a suction fan, a filter screen and a hopper; the number of the screw extruders is at least two, the outlets of the screw extruders are separately connected with spray nozzles; the spray nozzles are arranged on the outside of the receiving net, the inside of the receiving net, close to the position of meltblown fibers sprayed by the spray nozzles is provided with the suction device; the outside of the receiving net, close to the spray nozzles is provided with the electret rack, the receiving net is arranged on the reciprocating trolley; and the screw extruder automatic lift device contains a lifting drive motor, a speed reducer, a driving gear, a lifting screw, a guide post and a guide sleeve.

The invention discloses a composite medical stone ceramic filter element rich in trace elements, which is prepared from the following raw materials in parts by weight: 13-15 parts of medical stone, 9-11 parts of diatomite, 10-13 parts of nut shell activated carbon, 8-10 parts of activated aluminum oxide, 1-2 parts of chitosan, 7-9 parts of light calcium carbonate, 3-4 parts of zinc oxide, 7-9 parts of montmorillonite, 2-3 parts of ammonium bromide, 4-6 parts of polyvinylpyrrolidone, 5-7 parts of anthracite filter material, 3-5 parts of palm fiber, 5-7 parts of modified cocoanut shell activated carbon and a proper amount of water. As the palm fibers are added, the toughness of the filter element is improved; meanwhile the palm fibers have multi-porous performance, the filtration and adsorption performances are enhanced; as the modified cocoanut shell activated carbon is added, the filter element is sufficient in gaps, good in adsorption performance, high in strength, easy to regenerate and economical and durable; as the added medical stones serving as the raw material contain a lot of trace elements, the trace elements are separated while adsorbing, and the filter element is environmentally friendly. The filter element disclosed by the invention can be used for air adsorption and filtration.

The invention belongs to the field of air cleaning equipment, and concretely relates to a filtering apparatus capable of enhancing purifying effect of an air purifier. The filtering apparatus comprises the filter layers arranged at the inner side and / or outside of the filtering apparatus of the air purifier, wherein the quantity of the filter layers is more than one, the shape of the above filter layer and the above filtering apparatus of the air purifier are matched, each filter layer comprises two layers of filter screen supports positioned at outside and an adsorption layer arranged between two layers of the filter screen supports, the adsorption layer employs an air filtering membrane, block sponge or a granular absorbent as the adsorption materials, and the adsorption materials in each filter layer are same or different. The filtering apparatus can effectively solve the problems of limited types of the harmful gas purified by the current air purifiers and small adsorption quantity, has the advantages of simples structure, convenient modification and low cost, and is suitable for air purifying on different occasions.

The invention discloses ultrafiltration embossed melt-blown non-woven fabric and a preparation method thereof. The ultrafiltration embossed melt-blown non-woven fabric is prepared from a melt-blown non-woven fabric composite slice material; and the melt-blown non-woven fabric composite slice material is prepared from the following raw materials in parts by weight: 65-80 parts of polypropylene melt-blown non-woven fabric slices, 24-36 parts of poly(dimethylsiloxane)-grafted-polyacrylate, 5-8 parts of maleic anhydride styrene dimonomer grafted polypropylene, 4.5-6 parts of nano titanium dioxide,3-5 parts of mesoporous silicon dioxide, 2.4-3 parts of stearyl phthalamide and 1.5-2 parts of zinc stearate. The ultrafiltration embossed melt-blown non-woven fabric is prepared from the melt-blownnon-woven fabric composite slice material, and the melt-blown non-woven fabric composite slice material can be normally produced through an existing melt-blown non-woven fabric machine; and the produced ultrafiltration embossed melt-blown non-woven fabric is excellent in filtering performance, moderate in gram weight, high in tensile strength and good in softness.

The invention discloses a cordierite compound ceramic filter element. The cordierite compound ceramic filter element is characterized by being prepared from the following raw materials in parts by weight: 13-15 parts of cordierite, 9-11 parts of mullite, 6-8 parts of silochrom, 4-7 parts of smectite, 8-10 parts of activated alumina, 3-5 parts of calcium sulfate, 2-3 parts of dimethyl silicon oil, 3-4 parts of sodium alginate, 3-5 parts of palm fibers, 2-3 parts of urea, 5-7 parts of modifying coconut active charcoal, and the defined amount of water. The cordierite compound ceramic filter element provided by the invention has the advantages that the silochrom is added, so that the adsorptive property and heat stability are good, the chemical property is stable, and the mechanical strength is high; the palm fibers are added, so that the tenacity of the filter element is added, meanwhile, the cordierite compound ceramic filter element has a porous property, and the filtering adsorptive property is improved; the modifying coconut active charcoal is added, so that the gap structure is developed, the adsorptive property is good, the intensity is high, the regeneration is easy, and the cordierite compound ceramic filter element is economical and durable, is long in service life, is corrosion-proof and can be used for air adsorption filtration.

The invention discloses a full-sintered filter element which is formed by mixing 5-10 percent of green dry stone powder, 65-75 percent of alumina powder, 10-20 percent of kaolin and 2-8 percent of evaporating agent counted in percentage by weight and sintering the mixture at the temperature of 1000-1200DEG C. The outer surface of the full-sintered filter element disclosed by the invention is coated by a layer of alumina, so that the absolute filtering precision reaches 0.3-1 micrometer. The full-sintered filter element disclosed by the invention has the advantages of acid and alkali resistance and high temperature and high pressure resistance and is suitable for filtering flue gas in the chemical production process of which the temperature range is within 500DEG C and the pH value is in a range of 1 to 13.

The invention provides a water treatment porous membrane which comprises high molecular weight polyethylene, a water-soluble polymer, a pore-forming agent and an antioxidant, wherein the high molecular weight polyethylene has average molecular weight ranging between 1.0*10<5> and 10.0*10<6> and density of 0.940-0.976 g / cm<3>; on the basis of 100 weight parts of the high molecular weight polyethylene, the weight of the water-soluble polymer is 5-50 parts; the weight of the pore-forming agent is 100-500 parts; the weight of the antioxidant is 0.1-10 parts. The water treatment porous membrane prepared by the invention has the thickness of 5-30 microns, the micropore size of 10-100nm, the porosity of 20-60% and the surface contact angle of 30-95 degrees. The porous membrane disclosed by the invention is excellent in durability, simple in preparation process, small in thickness, uniform and small in particle size distribution, and has an excellent hydrophilic property and filtration and adsorption effects.

The invention relates to an air filtering absorber. The air filtering absorber is of a cylindrical combined type structure, and is mainly composed of a filtering absorber housing, a paper filer, and an active carbon adsorption layer; the filtering absorber housing is composed of an internal pore plate, an external pore plate, an internal screen net, an external screen net, a pressing pad, and a sealing plate; the paper filter is composed of a primary efficiency filtering layer, a high efficiency filtering layer, and a paper filter internal pore plate. The air filtering absorber adopts the cylindrical combined type structure, resistance is low, adsorption area is large, multi-stage adsorption is realized, purifying capturing efficiency is high, high efficiency filtering material impregnated activated carbon is adopted, the air filtering absorber is invented based on pure physical principles, no energy consumption is caused, maintenance is simple and convenient. The air filtering absorber is suitable to be used in sealed spaces such as sealed defense works, vehicles, ships, and shelters, can be used for filtering radioactive ash, chemical toxins, and biological toxins, and purifying rate is increased to be 99.999% at a nominal air delivery.

The invention discloses a silochrom added ceramic filter element with good stability. The silochrom added ceramic filter element is characterized by being prepared from the following raw materials in parts by weight: 10-12 parts of activated carbon fiber, 12-13 parts of kaolin, 8-10 parts of mullite, 9-11 parts of zeolite powder, 6-8 parts of powdered aluminum, 4-7 parts of silochrom, 1-2 parts of polyvinyl alcohol, 3-5 parts of wheat flour, 3-5 parts of smashed Badam shell, 3-5 parts of smashed cotton hull, 1-2 parts of epoxidized soybean oil, 5-7 parts of modified cocoanut active charcoal and a proper amount of water. Due to the addition of the silochrom, the ceramic filter element is high in adsorptive property, good in thermal stability, stable in chemical property and high in mechanical strength; due to the addition of the Badam shell and cotton hull, the tenacity of the filter element is increased, and the filtering adsorptive property is improved because of porous performance; due to the addition of the modified cocoanut active charcoal, the ceramic filter element is large in gaps, good in adsorptive property, high in strength, easy to regenerate, economical and durable; the filter element can be used for air adsorption filtration.

The invention discloses a ceramic filter element with filter and purifying effects and a preparation method thereof. The ceramic filter element is prepared from the following raw materials in parts by weight: 65-78 parts of deionized water, 34-48 parts of diatomite, 26-39 parts of kaolin, 13-21 parts of medical stones, 3-6 parts of active carbon, 4-6 parts of calcium sulfate, 2-5 parts of palm fibers, 5-7 parts of zirconium oxide, 8-10 parts of silicon dioxide, 2-8 parts of magnesium oxide, 8-14 parts of polyethylene and 1-3 parts of silicon micro powder. The invention further discloses a preparation method for the ceramic filter element. The prepared ceramic filter element with filter and purifying effects is simple in production process, and is used for a long time; the palm fibers are added, so that porous performance is achieved while toughness of the filter element is improved, and the filter absorption is improved; the active carbon and the silicon micro powder are added, so that the strength and the absorption of the filter element are improved; the raw materials are simple and easily available, so that the production cost is low, the purifying efficiency is high, the corrosion resistance is good, the service life is long, harmful particles in air can be effectively adsorbed, and the using effect is good.

The invention provides an automobile air filter, a filter element and an automobile. The filter element comprises an initial filtering layer, a main filtering layer and a micro-filtering layer, the initial filtering layer is formed by fiber cloth made of rattan bark, rattan cores and poplar filtering material in a compression molding mode; the main filtering layer is composed of a plurality of rattan core layers and cushion layers, each rattan core layer is formed in the mode that a plurality of rattan cores are arranged side by side, one cushion layer is arranged between every two rattan core layers, and the cushion layers are made of materials the same as those of the initial filtering layer in a tight compaction mode through a die; the micro-filtering layer is obtained by cutting the filter cloth obtained by mixing the rattan bark, the rattan cores and the cellulose acetate fiber materials, the main filtering layer in the middle is wrapped by the initial filtering layer and the micro-filtering layer, the hollow direction of the rattan cores of the main filtering layer is coincident with the air flowing direction, the axial adsorption characteristic of plants and the dot-matrix hole arrangement mode are adopted, three-level filtering is achieved, the filtering effect can be improved, environmental protection is achieved, and the service life of the air filter is prolonged; meanwhile, quality of air entering an engine is optimized, the air inlet amount is guaranteed, and abrasions to the engine are reduced.

The invention discloses a household air purification device. The device comprises a machine body, and the upper end of the machine body is provided with a ring-shaped groove and a detachable filter screen device; the detachable filter screen device comprises a ring-shaped top plate, a ring-shaped bottom plate, a ring-shaped sliding groove, a ring-shaped sliding base, a filter screen mechanism, a first motor and a driving gear, a ring-shaped dust collection groove is formed in the bottom of the ring-shaped groove, a hollow groove is formed in the middle of an inner cavity of the machine body, the hollow groove is internally provided with an exhaust fan and a filtration and adsorption mechanism, and a humidification mechanism is arranged in an inner cavity formed in the upper end of the machine body; the filtration and adsorption mechanism comprises a second motor, a rotating shaft, a rotating frame, an air deflector, an air guide pipe and a filtration and adsorption material, and the humidification mechanism comprises a water storage tank, a heating pipe and a breather pipe.

The invention discloses a laminated composite functional mask filter element, a mask, and a preparation method of the filter element; the mask filter element is sequentially provided with a skin-friendly moisture absorption layer, a filter layer, an antibacterial filter layer and a protective layer from inside to outside, and the four layers of structures form a whole through a carbon fiber chopped needling structure; the skin-friendly moisture absorption layer and the protective layer are spun-bonded non-woven fabrics, the antibacterial filter layer is an activated carbon fiber layer, and thefilter layer is a melt-blown non-woven fabric layer.

The invention provides an automobile air conditioner filter, a filter element and an automobile, wherein the filter element comprises a primary filtering layer, a main filtering layer and a microfiltration layer, wherein the primary filtering layer is formed by carrying out compression molding on fiber cloth prepared from filtering material made of rattan peel, rattan cores and poplar; the main filtering layer adopts a plurality of rattan core layers and cushion layers; each rattan core layer is formed by a plurality of rattan cores which are arranged side by side; each cushion layer is arranged between every two rattan core layers; the material of the cushion layers is the same as that of the primary filtering layer; close compaction is carried out by a mould; the microfiltration layer is obtained by mixing rattan peel, rattan cores, poplar and acetate fiber material and then cutting fiber cloth; the middle main filtering layer is covered by the primary filtering layer and the microfiltration layer; the directions of the rattan cores of the main filtering layer are consistent with the air flowing direction; the axial adsorption characteristic of plants and a dot-matrix type land pore arrangement way are utilized, and three-stage filtration is formed, so that the filtering effect is improved, high quality clean air is provided for an air conditioner and a car, the taste of air is better changed, and the air is better sterilized.

The invention discloses a preparation method of a novel glass slag filter material with a negatively charged modified surface, wherein the preparation method includes the following steps: step S101, hydroxylation pretreatment of a glass slag surface: a, repeatedly cleaning a glass slag raw material for 5-6 times with 99.8% high-grade pure (GR) ethanol; b, successively putting the cleaned glass slag raw material into beakers containing deionized water, ethanol and acetone respectively, and carrying out ultrasonic treatment for 10 min respectively; c, completely blow-drying the glass slag raw material after ultrasonic cleaning with nitrogen; and d, putting the glass slag raw material after nitrogen blow-drying into an 'piranha' solution (with the volume ratio of concentrated sulfuric acid tohydrogen peroxide of 7:3), and then bathing in water for 1-2 h at the temperature of 95 DEG C. The novel filter material based on recycling of waste glass resources is achieved. Compared with a traditional filter material of quartz sand, the novel filter material has the advantages of backwash water saving and good filtering effect, has filter material which is not easy to lose, and is of great significance to reduce the production cost and running and operation difficulty of water plants and other use enterprises.

The invention discloses a modular vertical flow constructed wetland sewage plant tail water treatment device which comprises a wetland pool body, a plant matrix module, matrix modules, an aeration device, a water inlet groove, a water inlet pipe, a water distribution pipe, a water storage pool and a water outlet backflow device, a pool body matrix filler is arranged in the wetland pool body, and the water inlet pipe is arranged at the lower end of one side of the wetland pool body; the water inlet pipe is connected with the water inlet groove, the bottom of the wetland pool body is connected with the water distribution pipe, the water distribution pipe is connected with the water inlet pipe, the water storage pool is arranged at the upper part of the other side of the wetland pool body, the water outlet backflow device is arranged at the bottom of the water storage pool, and a water outlet pipe is arranged on the water storage pool; the aeration device is arranged at the middle upper parts of the plurality of layers of matrix module groups; the invention further relates to a tail water treatment method utilizing the device, on one hand, the upward vertical flow constructed wetlandis adopted to properly relieve blockage, and the influence of blockage on a wetland system is reduced by the method; on the other hand, the wetland substrate is modularized so that when the wetland isblocked, a new module or matrix unit is convenient to use through replacement and the subsequent maintenance is convenient.

The invention provides an indoor activated carbon air purifier, which comprises a supporting base, a purifying cylinder, two sealing plates and an activated carbon purifying mechanism, the purifying cylinder is fixedly connected to the surface of the supporting base, the sealing plates are fixedly connected to the left end and the right end of the purifying cylinder, and air holes are formed in the surfaces of the two sealing plates; and the top of the purifying cylinder is slidably connected with an arc-shaped cover plate, and the activated carbon purifying mechanism is arranged in the purification cylinder. The indoor activated carbon air purifier relates to the field of the purifier. The indoor activated carbon air purifier is designed according to the problems that an existing purifier easily adsorbs flocculent impurities, a purification layer is too fixed, and frequent cleaning is needed, and the indoor activated carbon air purifier can filter air through a flowing layer, can be continuously and automatically cleaned in the filtering process and is high in purification efficiency. Therefore, the problems that a common activated carbon air purifier is prone to adsorbing a large number of impurities such as fluff, fluff and the like, the impurities easily affect the overall ventilation effect of activated carbon, the fluff and the fluff need to be cleaned and treated more frequently, and use is inconvenient are effectively solved.

The invention discloses a thermostable cordierite composite ceramic filter element. The thermostable cordierite composite ceramic filter element is characterized by comprising the following substances in parts by weight: 35 to 49 parts of cordierite, 5 to 17 parts of zirconia, 5 to 8 parts of chemigum, 11 to 28 parts of sodium alginate, 15.5 to 40.8 parts of zeolite powder, 5 to 19 parts of aquatic stone fiber, 11 to 24 parts of high-temperature resistant adhesive, 5 to 19.4 parts of zinc oxide, 3 to 7 parts of borax, 10 to 24 parts of cyclohexanone, 0.75 to 12.8 parts of titanium oxide, 5 to 18 parts of kaolin, 25 to 43 parts of steatite porcelain, 3 to 12 parts of barium carbonate, 10 to 25 parts of quartz and 10 to 24 parts of clam shell powder. The thermostable cordierite composite ceramic filter element has the advantages of high adsorption performance, good thermostability, stable chemical properties, high mechanical strength, good toughness, developed gaps, good adsorption performance, high strength, easiness in regeneration, economical efficiency, durability, long service life and corrosion resistance and can be used for air adsorption filters.

The invention discloses a cabin ventilation device with an air draft function, which belongs to the technical field of ventilation devices. The cabin ventilation device comprises a ventilation and airexchange box, the upper end of the ventilation and air exchange box is connected with a ventilation pipe and a ventilation pipe, and the ventilation pipe and the ventilation pipe are both connected with a connecting cover; the other end of the connecting cover is connected with a ventilation pipeline, and the lower end of the ventilation pipeline is connected with a ventilation base. Ventilationand air exchange are carried out through air exhaust of the ventilation and air exchange box, air circulation is carried out through independent work of an aspirator and an exhaust fan and through independent pipelines, mutual interference is avoided, and ventilation and air exchange are convenient; a ventilation cavity and an air exchange cavity are formed in the ventilation pipeline, ventilationis conducted through one pipeline, fixed installation is convenient, and the situation that the size is too large due to the fact that multiple pipelines are connected is avoided; an exhaust cylinderand an air inlet cylinder are arranged, an overturning adsorption net is arranged in the air inlet cylinder for moisture adsorption, fan blades are arranged in the exhaust cylinder, the exhaust portis formed in the side edge, and the poor ventilation effect caused by mixing of ventilation and air exchange gas is avoided.

The invention relates to the technical field of filter paper production, and discloses an engine oil filter paper manufacturing process which comprises the following steps: firstly, melt-blowing is performed through a melt-blowing mechanism to obtain a non-woven fabric layer; when the non-woven fabric layer is not completely solidified and shaped, water absorption beads and magnetic powder are sprayed to the non-woven fabric layer through a spraying mechanism; then the non-woven fabric is cooled and shaped through the cooling mechanism; through holes are formed in the cooled and shaped non-woven fabric through a hole forming mechanism to obtain a non-woven fabric center layer; and finally, the two sides of the non-woven fabric center layer are covered with filter paper, one side of the filter paper is coated with protection resin, and the engine oil filter paper is obtained. The non-woven fabric layer is melt-blown through the melt-blowing mechanism and processed to obtain the non-woven fabric center layer, so that the overall structural strength and hydrolysis resistance of the engine oil filter paper are improved; and water absorption beads and magnetic powder are sprayed through the bead spraying device and the powder spraying device when the non-woven fabric is not completely cooled and shaped, so that the sprayed water absorption beads and magnetic powder can be well bonded and embedded with the non-woven fabric and are not easy to separate.

The invention provides an automobile air filter, a filter element and an automobile. The filter element comprises an initial filtering layer, a main filtering layer and a micro-filtering layer, the initial filtering layer is formed by fiber cloth made of rattan bark, rattan cores and poplar filtering material in a compression molding mode; the main filtering layer is composed of a plurality of rattan core layers and cushion layers, each rattan core layer is formed in the mode that a plurality of rattan cores are arranged side by side, one cushion layer is arranged between every two rattan core layers, and the cushion layers are made of materials the same as those of the initial filtering layer in a tight compaction mode through a die; the micro-filtering layer is obtained by cutting the filter cloth obtained by mixing the rattan bark, the rattan cores and the cellulose acetate fiber materials, the main filtering layer in the middle is wrapped by the initial filtering layer and the micro-filtering layer, the hollow direction of the rattan cores of the main filtering layer is coincident with the air flowing direction, the axial adsorption characteristic of plants and the dot-matrix hole arrangement mode are adopted, three-level filtering is achieved, the filtering effect can be improved, environmental protection is achieved, and the service life of the air filter is prolonged; meanwhile, quality of air entering an engine is optimized, the air inlet amount is guaranteed, and abrasions to the engine are reduced.

The invention discloses a geothermal water conveying device with a replaceable filter element for geothermal energy, and relates to the technical field of geothermal water heat supply. The device comprises a stretchable pipe, a water pump and a rotating shaft. A water pipe is installed inside the stretchable pipe, a rubber blanket is fixedly arranged at the outer surface of the water pipe, a box is arranged at the right side of the stretchable pipe, and the water pump is connected to the right end of the water pipe. According to the geothermal water conveying device with the replaceable filterelement for geothermal energy, by arranging a fixing screw, the shell can be disassembled and cleaned, then, the internal filter element can be replaced and cleaned, and therefore the phenomenon thatthe device cannot work due to the fact that the interior of the device is blocked is avoided; by arranging a first solid-liquid separator and a second solid-liquid separator, the phenomenon that theinterior of the device is blocked due to the fact that impurities contained in geothermal water enter the device can be avoided, meanwhile, the geothermal water is repeatedly separated and filtered, the cleanness of geothermal water is improved, later geothermal water consumption is facilitated, and waste of water resources is avoided.

The invention relates to a modified polyactic acid composition for a cigarette filter stick and a preparation method thereof. The composition comprises following parts of raw materials, by weight, 100 parts of polyactic acid, 0.02-3 parts of polyactic acid-beta-cyclodextrin, 0.08-5 parts of sodium carbonate, 0.05-5 parts of sodium pyrrolidonecarboxylate, 0.01-4 parts of vitamin and 0.01-8 parts of polyacrylamide. The filter stick prepared through the polyactic acid composition is better in absorbing performance on smoke compared with the prior art and good in comprehensive performance, and a part of indexes of the filter stick exceed those of a cellulose acetate filter stick.

The invention relates to the field of medical suction or drawing instruments, and particularly discloses an exhaust device for endoscopic surgery. The exhaust device comprises a body, wherein a partition plate is arranged in the middle of the body, the partition plate divides the internal space of the body into a first cavity and a second cavity which are mutually independent, the top end of the first cavity is provided with a first pipe body and a second pipe body, the top end of the second cavity is provided with a third pipe body and a fourth pipe body, one end of the first pipe body and one end of the third pipe body both extend to the bottom end of the body, one end of the second pipe body and one end of the fourth pipe body both extend to the top end of the body, the second pipe body is connected with the third pipe body, and a filter element is arranged in the second cavity. The invention further discloses an exhaust method for the endoscopic surgery. According to the invention, a filter element can filter harmful smoke containing particulate matters such as PM2.5 and PM10 in gas, meanwhile, peculiar smell can be removed, and the healthy environment of the medical staff in the surgery process is guaranteed.