30results about How to "Accelerated destruction" patented technology

The invention discloses a preparation method of a rod-like selenium nano-carrier, and belongs to the technical field of nano-pesticides. The rod-like selenium nano-carrier is formed by converting chitosan modified amorphous selenium (a-Se) into single crystal ash selenium (t-Se). The amorphous selenium is initially spherical, and after chitosan modification, the spherical amorphous selenium is converted into single crystal ash rod-shaped selenium nanoparticles. The length of the rod-like selenium nano-carrier is 590-610 nm, the diameter of the rod-like selenium nano-carrier is 20-25 nm, the effective average particle size of the rod-like selenium nano-carrier is 90-110 nm, the drug loading rate is 39.28% + / -2%, and the encapsulation efficiency is 64.90% + / -3%. In addition, the invention also provides an application of the rod-like selenium nano-carrier in a nano bactericide material.

The preparation method comprises the following steps: crushing raw materials, carrying out dual-frequency ultrasonic extraction in combination with a solvent to obtain a high-activity and high-oxidation-resistance component, filtering through a micro-filtration membrane, mixing an extracting solution and crushed filter residue raw materials according to a ratio, sterilizing, adding modified microcrystalline cellulose and other auxiliary materials, and mixing, so as to obtain the anti-aging body-consolidating and life-prolonging pill. And refining honey and pelleting to prepare the life-prolonging pill with high stability, good pill quality and high oxidation resistance.

The invention relates to the technical field of cables, in particular to an ultra-high temperature resistant elastic wall flat cable, which has a flat structure and is woven with a cable core as a braided yarn and an inorganic fiber as an axis yarn; the cable core comprises, from the inside to the outside, a conductor, a polyimide film insulation layer, a first mica tape sheath, an illite-based aerogel felt, a second mica tape sheath and an aramid fiber sleeve in sequence; the flat structure enables the cable to be arranged neatly and occupy less space; in the case of limited internal space of a missile, the space can be more effectively utilized, the occupied area of ​​the cable can be reduced, and the layout can be optimized; the cable is more convenient to install and maintain, and can more easily pass through narrow spaces and complex wiring paths; during maintenance, it is also easier to troubleshoot and replace the cable; the cable can withstand instantaneous jetting of ultra-high temperature flames and can work stably for a period of time in a high temperature environment.

The application provides a micro-channel water-cooled plate flow equalization structure, which comprises a fluid inlet of a micro-channel water-cooled plate, a flow collecting box, a rough element structure, parallel arranged micro flow channels, a flow converging box and a fluid outlet of the micro-channel water-cooled plate; the rough element structure is arranged at the rear half of the parallel arranged micro flow channels to adjust flow resistance, so that pressure drops of the front half of the flow channels are approximately equal; refrigerant enters the flow collecting box through the fluid inlet of the micro-channel water-cooled plate, flows through the rough element structure, converges in the flow converging box and is discharged from the water-cooled plate through the fluid outlet of the micro-channel water-cooled plate. The method and device improve the problem of uneven flow distribution in the micro flow channels of the micro-channel water-cooled plate and improve temperature uniformity of the water-cooled plate. The method and device introduce the rough element structure, realize flow equalization effect, enhance fluid disturbance, destroy thermal boundary layer and improve convective heat transfer effect of the water-cooled plate.

The invention belongs to the technical field of high polymer materials, and discloses a device and a method for evaluating slow crack propagation resistance of a plastic pipe. The device comprises a point load loading mechanism, a surfactant solution storage tank, a sealable water tank, heating equipment, circulating pressurizing equipment, an electromagnetic valve and a throttling valve, and the point load loading mechanism comprises a point load tool, a collet bracket and an end socket. And the circulating pressurizing equipment is used for pressurizing the interior of the sample and realizing dynamic circulating flow of the surfactant solution between the sample and the surfactant solution storage tank. The device can conveniently and effectively evaluate the point load performance of the pipe, effectively simulate the real stress condition of the pipe, shorten the evaluation period, obtain reliable test data and provide technical basis for pipe construction.

This invention provides bfrA Single gene knockout or bfrA Genes and bfrB Double gene knockout of Neisseria gonorrhoeae and its applications involve the field of biotechnology. Research has found that... bfrA Single gene knockout and bfrA and bfrB Double gene knockout of Neisseria gonorrhoeae resulted in increased formation of vesicles on the outer membrane, disruption of the cell wall and cell membrane, reduced adhesion and invasion abilities, decreased bacterial activity, decreased ATP levels, and weakened ability to infect mice. Therefore, knocking out Neisseria gonorrhoeae... bfrA Gene or bfrA and bfrB The dual-gene assay can be used to prepare products for the production of gonococcal outer membrane vesicles and to construct low-pathogenic gonococcal models.

This invention belongs to the field of agricultural herbicides and provides a photosynthetic inhibitor herbicidal composition comprising 5-aminolevulinic acid, malondialdehyde, and a herbicidal active ingredient. The herbicidal active ingredient is selected from one or a combination of several herbicides selected from acetolactate synthase inhibitors, photosynthetic system II inhibitors, or protoporphyrinogen oxidase (PPO) inhibitors. This invention utilizes the synergistic effect of 5-aminolevulinic acid, malondialdehyde, and a specific type of herbicidal active ingredient to effectively enhance the efficacy of the herbicidal active ingredient, enabling rapid and thorough weed control.

The carboxymethyl cellulose starch ether for cleaning the photovoltaic panel is prepared by the following steps: 1) taking refined cellulose and powder starch, and uniformly mixing to obtain a mixture; 2) adding the mixture into an alcohol-water solution containing sodium hydroxide and ethylurea, and reacting under a stirring condition to obtain an alkalized mixture; and 3) adding an alcoholic solution containing chloroacetic acid, 3-oxocyclobutane-1, 1-dicarboxylic acid and 2-chloroethyl urea into the alkalized mixture, and carrying out a reaction under a stirring condition to obtain the target product, with the alcoholic solution containing chloroacetic acid, 3-oxocyclobutane-1, 1-dicarboxylic acid and 2-chloroethyl urea. Through synergic cooperation of cellulose and starch, the production cost can be reduced, the anti-dirt capability can be effectively improved, and the application range can be expanded.

The invention discloses a noiseless self-balancing pile head breaking tool and a using method thereof. The pile head breaking tool comprises a traction piece, a pile casing piece, a top plate piece and a power lifting piece. The traction piece is arranged on the outer side of the circumference of the pile casing piece, and the top end of the traction piece is connected with the top plate piece; the top plate piece is located above the pile casing piece, the power lifting piece is arranged between the top plate piece and the top end of the pile casing piece, and the power lifting piece stretches and pulls the traction piece and the solidified concrete above the traction piece through the top plate piece. The using method comprises the following steps that S1, the traction piece and the reserved steel bar are bound and connected; s2, a pile casing part is placed; s3, pouring operation is carried out; s4, girdling operation is conducted on the peripheral side wall of the primary pile body; s5, a top plate piece and a power lifting piece are installed; s6, the power lifting piece drives the pile head part and the pile body part to be separated from the girdling position; and S7, the pile casing part and the solidified concrete in the pile casing part are cut off, and a finished pile body is obtained. The problems that in existing pile foundation construction, in the pile head breaking process, consumed time is long, the labor cost is high, reinforcing steel bars are prone to being damaged, and the construction environment is severe are solved.

The invention provides a surface modification method of inorganic fibers. The method comprises the following steps: (1) pre-softening organic matters on the surfaces of the inorganic fibers; (2) placing the pre-softened inorganic fibers in a prepared surface treatment solution for reaction under mechanical conditions so as to perform surface modification on the inorganic fibers; the surface treatment liquid comprises a penetrant, a cosolvent, other functional aids, a pH regulator and water. According to the inorganic fiber surface modification method provided by the invention, the inorganic fiber surface coating layer can be effectively subjected to surface modification and modification treatment on the basis of hardly damaging the performance of the inorganic fiber.

The invention discloses a fire extinguishing agent special for forest and grassland in the technical field of fire extinguishing agents for forest and grassland. The fire extinguishing agent comprises the following components in parts by weight: 2-3.5 parts of a surfactant, 60-75 parts of a high-concentration flame retardant, 1-2 parts of a high-strength penetrant, 0.5-1.0 part of a composite thickener, 3-5 parts of a stabilizer, 0.5-1 part of a crosslinking aid, 2-4 parts of a hydrophobic component, 1-2 parts of an anti-blocking agent and 15-20 parts of deionized water. According to the fire extinguishing agent special for the forest grassland, the added high-strength penetrating agent and the added composite thickening agent can be attached to the periphery of the grassland, so that the fire extinguishing agent is not prone to being blown away by air waves or strong wind formed by big fire, the fire extinguishing agent can directly reach the root of a fire source, the fire extinguishing speed and efficiency are improved, the using amount of the fire extinguishing agent is reduced, and the fire extinguishing cost is reduced; and ammonium dihydrogen phosphate is added as a flame retardant, so that re-combustion of a forest fire can be effectively prevented, or the re-combustion time of the forest fire can be remarkably prolonged, and more time is provided for manually cleaning a fire scene to ensure that the forest fire is completely extinguished.

The EGR valve with the excellent sealing performance comprises a valve body, a motor assembly, a valve rod, a valve rod transmission assembly and a valve plate, a motor cavity and an air cavity are formed in the valve body, the motor assembly is installed on the motor cavity, one end of the valve rod is in linkage with the motor assembly through the valve rod transmission assembly, and a return spring is further arranged in the valve body. The other end of the valve rod is connected with the valve block, a valve seat is installed at the air inlet end, corresponding to the air cavity, of the valve body, and an exhaust pipe is installed at the air outlet end, corresponding to the air cavity, of the valve body. The sealing assembly is arranged between the corresponding motor cavity and the air cavity in the valve body and used for sealing the outer wall of the valve rod and the inner wall of the valve body, the sealing assembly comprises a first sealing ring and a first sealing scraping piece, and the first sealing scraping piece is tightly attached to the side, close to the valve plate, of the first sealing ring. The sealing doctor blade is additionally arranged on the sealing ring between the valve rod and the valve body to protect the sealing ring, so that the service life of the sealing ring is prolonged, and a good protection effect on the internal sealing performance of the motor is achieved.

This invention discloses a method for preparing an in-situ reinforced single-atom nanoenzyme bactericidal composite material for concrete. The method includes using sodium ferric ethylenediaminetetraacetate (EDTA) as a core precursor, and encapsulating calcium peroxide on its surface through an in-situ reaction to form a composite precursor of calcium peroxide encapsulating EDTA; directional hydrolysis of tetraethyl orthosilicate (TEOS) to form a thin layer of silica on the surface of the composite precursor; subsequent calcination under an inert gas to obtain a three-layer core-shell composite material of single-atom iron nanoenzyme / porous calcium peroxide / porous silica; and finally, grafting with aminosilane to obtain a three-layer core-shell composite material of single-atom iron nanoenzyme / porous calcium peroxide / porous silica with surface-grafted aminosilane. The composite material prepared by this method can achieve continuous and efficient bactericidal action in concrete while increasing nucleation sites, promoting hydration, and effectively improving the early strength and durability of concrete.

The present invention relates to a permanent magnet heat exchanger and a manufacturing method thereof which is beneficial to improving the heat exchange coefficient. The invention belongs to the technical field of heat exchangers, and includes an upper half assembly of a heat exchanger and a lower half assembly of a heat exchanger. The lower half assembly of the heat exchanger is provided with a cooling water pipe connected to the lower half assembly of the heat exchanger, and a plurality of heat sinks sleeved with the cooling water pipe are provided at both ends of the lower half assembly of the heat exchanger. The upper half assembly of the heat exchanger includes an upper half shell of the heat exchanger, an inner shaft connected to the lower half assembly of the heat exchanger is provided in the upper half shell of the heat exchanger, an external impeller movably nested with the upper half shell of the heat exchanger is provided at the upper end of the upper half shell of the heat exchanger, an external magnetic rotor nested with the external impeller is provided between the external impeller and the upper half shell of the heat exchanger, and an internal magnetic rotor nested with the inner shaft and magnetically cut-transmitted with the external magnetic rotor is provided between the inner shaft and the upper half shell of the heat exchanger. The forced movement of the medium to be cooled is realized, the heat dissipation effect of the radiator is greatly enhanced, and its heat exchange coefficient is improved.

A high fatigue life rubber composite material and its preparation method and application. The present invention belongs to the field of rubber materials and their preparation. The purpose of the present invention is to solve the technical problem that the existing composite rubber materials have poor fatigue resistance. The high fatigue life rubber composite material of the present invention is prepared from natural rubber, butadiene-butadiene rubber, plasticizer, reinforcing filler, activator, sulfur, accelerator and antioxidant, and the butadiene-butadiene rubber is a random copolymer obtained by catalysis of an iron-based catalyst, wherein the sum of the ethylene and propylene side group contents is 40-60%. A high fatigue life rubber composite material of the present invention is used to prepare rubber products used in dynamic deformation conditions such as tires, rubber air springs, conveyor belts or sports shoe soles. The iron-based butadiene-butadiene rubber molecular chain used in the present invention has good flexibility and small hysteresis loss, which can effectively improve the fatigue life of the rubber composite material.

The invention relates to the technical field of food processing, and particularly discloses a preparation method of peony seed oil obtained by physically squeezing peony seeds, the peony seed oil and application, the preparation method of the peony seed oil obtained by physically squeezing the peony seeds comprises the following steps: carrying out microwave heating treatment on pretreated dried peony seeds; uniformly mixing the dried peony seeds subjected to microwave heating with soybean seed coats; physically squeezing the mixed dried peony seeds and soybean seed coats to obtain crude oil; and centrifuging and filtering the crude oil to obtain the peony seed oil. According to the method, the peony seeds are physically squeezed by combining the microwave technology and adding the soybean seed coats, the oil extraction rate of the peony seeds of the physical squeezing method is increased, the physical squeezing method is free of solvent residues, the process is relatively simple, and the body health of consumers can be better guaranteed. According to the method, the oil yield is increased for enterprises for preparing the peony seed oil, the environmental pollution is reduced, the process is simple, the economic cost is reduced, and the method is suitable for industrial production.

The invention belongs to the field of regenerative cooling channels, and particularly relates to a wide-speed-range self-adaptive structure and method of a regenerative cooling channel. The structure comprises a spoiler and a metamaterial elastic connecting piece, wherein one end of the spoiler is connected with the metamaterial elastic connecting piece, and the other end of the spoiler is fixed on the wall surface of the air flow channel; the metamaterial elastic connecting piece is configured to form an acute included angle with the wall surface of the flow channel in a balance state; the spoilers are configured to be that under the action of fluid, the included angle between each spoiler and the wall face of the corresponding flow channel can be reduced along with increase of the fluid flow, and therefore self-adaptive adjustment that heat exchange is enhanced when the flow is low and resistance is reduced when the flow is high is achieved. The inclination angle is automatically adjusted through the movable spoilers under the action of fluid, and wide-speed-range heat management that heat exchange is enhanced at low flow and resistance is reduced at high flow is achieved.

The present invention discloses a puncture kit for cartilage destruction and sampling of rabbit knee joint, comprising a puncture sleeve, a puncture needle and a syringe, wherein the puncture needle can be inserted into the puncture sleeve, the needle tail end of the puncture needle is fixedly sleeved with a puncture needle handle, the needle head end of the puncture needle extends into the sleeve and penetrates, the needle tail of the puncture needle is connected with a needle plug, the needle head end of the puncture needle penetrating the puncture sleeve is fixed with a fixed block, a plurality of rotating shafts are fixed on the outer circumferential wall of the fixed block, a cartilage surface destruction plate is rotatably connected to the rotating shaft, and a plurality of cartilage surface destruction spikes are fixedly connected to the cartilage surface destruction plate. The beneficial effects of the present invention are: by opening the umbrella-shaped cartilage surface destruction plate of the cartilage surface destruction spike, the cartilage surface of the knee joint can be destroyed, the destruction of the knee joint tissue and the sampling efficiency are improved, the minimally invasive operation also ensures that the damage area and the size of the sample can be controlled while avoiding contamination, and the scientificity and standardization are improved.

A method of performing a radioembolism treatment includes injecting 402 a plurality of radioembolism particles into a blood flow of a patient to treat a target tissue. Each radioembolic particle of the plurality of radioembolic particles includes a radioactive nucleus and a radiopaque layer. The method further includes obtaining 404 an image of the target tissue and the radioembolic particles to determine 406 a radiation dose delivered to the target tissue by the plurality of radioembolic particles, where the image is one of a computed tomography (CT) image and an X-ray image.

The invention discloses a mildewproof polyester thread and a preparation method thereof, and belongs to the technical field of polyester thread production, GB / TiO2 particles are added into polyester fiber raw materials to prepare modified polyester fibers, and the mildewproof polyester thread is obtained through bundling, winding, thread twisting and finished product treatment in sequence. Wherein the GB / TiO2 particles are prepared by loading ginkgolide B on mesoporous titanium dioxide, the active component of the ginkgolide B is protected by titanium dioxide, the activity of the ginkgolide B in the spinning process is maintained, the mildew-proof performance of the polyester thread is improved through the synergistic effect of titanium dioxide and ginkgolide B, and the ultraviolet resistance and flame retardance of the polyester thread can be improved by adding titanium dioxide. Therefore, the polyester thread has excellent comprehensive performance.

The utility model discloses an antibacterial barrier PE (Poly Ethylene) film and relates to the technical field of PE films. The film comprises a film body, the film body comprises a PE base material, a tensile film layer and a polyester film layer, the tensile film layer is adhered to one surface of the PE base material, the polyester film layer is adhered to the other surface of the PE base material, a copper ion film layer is adhered to one surface of the polyester film layer, and a silver ion film layer is adhered to one surface of the tensile film layer. Zinc chloride film layers are adhered to one surfaces of the copper ion film layer and the silver ion film layer, and wear-resistant film layers are adhered to one surfaces of the two zinc chloride film layers. Through the copper ion film layer, the silver ion film layer and the zinc chloride film layer, the antibacterial ability of the PE film in use is improved, the PE film can be conveniently used in various environments, the use effect of the PE film is improved, and through the tensile film layer and the wear-resistant film layer, the tensile ability and the wear-resistant ability of the PE film are improved, and the functionality of the PE film is increased.

The invention relates to the technical field of biomass dark fermentation hydrogen production, and discloses a corn straw electric enzymatic hydrolysate hydrogen production method based on a sectional type electric pretreatment device, which comprises a pretreatment device shell, and a pretreatment cavity is arranged in the pretreatment device shell; a straw electric enzymatic hydrolysate is stored in the pretreatment cavity; the pretreatment electrode is arranged in the pretreatment cavity, and the straw electric enzymatic hydrolysate is subjected to strong electric field electric pretreatment and weak electric field electric pretreatment by adjusting the pretreatment electrode; comprising the following steps: mixing corn straws with a citric acid-sodium citrate buffer solution, and putting the mixture into a pretreatment cavity for strong current pretreatment; after the strong current pretreatment is completed, cellulase is added into the pretreatment cavity, and weak current enhanced cellulose enzymolysis is carried out; and after the sectional type electric pretreatment is finished, carrying out mixed fermentation on the filtered electricity-taking enzymatic hydrolysate and hydrogenogens to produce hydrogen. The problems of crusting, coking, difficulty in pH control, difficulty in straw residue recovery and the like in the traditional corn straw fermentation process are solved.

The utility model provides a kind of anti-icing gate device, it is related to hydraulic engineering gate technical field, including: building, the upper position of building is equipped with a support frame, the middle position of support frame is equipped with a stable sleeve, the inner side position of stable sleeve is equipped with a group of driving mechanism, a vertical lifting rod is inserted between stable sleeve and driving mechanism, the upper position of gate body is provided with two symmetrical distribution stable grooves.In the side of gate, a sealing washer and a sealing plate are provided, the sealing washer and the sealing plate form a double-sealing structure to seal one side of the gate body, block the water from seeping into the beam grid of the gate, fundamentally reduce the risk of icing, at the same time, improve the overall waterproof performance of the gate, solve the problem that the beam grid on one side of the gate body is easy to freeze.

The invention relates to the technical field of medical treatment, and particularly discloses a red breaking liquid for bloody body fluid cell wax blocks. The red breaking liquid is prepared from absolute ethyl alcohol and distilled water, and the volume concentration of the absolute ethyl alcohol is 20%-30%; according to the method, the ethanol aqueous solution in a specific concentration range is adopted as a splitting system, efficient and selective splitting of the red blood cells in the bloody body fluid is realized, and cell membranes of the seedless red blood cells can be quickly destroyed by utilizing the dissolution effect of ethanol on cell membrane lipid and the hypotonic characteristic of the solution, so that contents of the seedless red blood cells are released and are easily eluted. Meanwhile, the morphological integrity and cell membrane antigenicity of nucleated cells (including tumor cells) can be protected to the greatest extent, and the problem of cell damage or antigen shielding possibly caused by a conventional hemolytic agent is avoided.

The invention relates to a method for intensifying vanadium extraction through roasting and acid leaching of vanadium shale. According to the scheme, the method comprises the following steps: crushing, roasting and grinding vanadium shale, and equally dividing to obtain n batches of roasted powder; adding water and concentrated sulfuric acid into the first batch of roasting powder, and then adding a first batch of leaching aid; and leaching, and carrying out solid-liquid separation to obtain a second batch of circulating leaching agent and a first batch of leaching liquid. A second batch of circulating leaching agent, concentrated sulfuric acid and water are added into the second batch of roasting powder to be mixed, and then a second batch of leaching assistant agent is added; and leaching, and carrying out solid-liquid separation to obtain a third batch of circulating leaching agent and a second batch of leaching liquid. ,...; the nth batch of circulating leaching agent and the (n-1) th batch of leaching agent are obtained, and n is a natural number ranging from 3 to 10. Mixing the n batches of lixiviates, adjusting the pH value, and adding sodium sulfite to obtain an extraction stock solution; and carrying out counter-current extraction and vanadium precipitation on the extraction stock solution to prepare vanadium pentoxide. The method is low in acid consumption, low in leaching aid consumption, high in vanadium leaching rate and good in vanadium and impurity separation effect.

The invention discloses a demulsifier and a preparation method thereof, and belongs to the technical field of demulsifiers. The preparation method of the demulsifier comprises the following steps: adding ferric trichloride hexahydrate, sodium acetate and polyethylene glycol into a polyol solvent, uniformly mixing at 60-80 DEG C, then adding bentonite, carrying out ultrasonic dispersion for 20-40 minutes, then reacting at 180-250 DEG C for 20-30 hours, washing and drying; carrying out ultrasonic dispersion on the obtained magnetic bentonite in an organic solvent for 15-30 minutes, adding a silane coupling agent, stirring for 6-10 hours at 70-85 DEG C, collecting a magnet, washing and drying; and carrying out ultrasonic dispersion on the obtained silanized magnetic bentonite in an organic solvent for 15-30 minutes, dissolving an acrylate copolymer demulsifier and a sulfonate demulsifier in the organic solvent, then adding 4-dimethylaminopyridine, carrying out ultrasonic dispersion for 10-20 minutes, then adding into a silanized magnetic bentonite solution, stirring for 4-6 hours at 85-110 DEG C, and carrying out magnet collection, washing and drying, so as to obtain the water-soluble magnetic bentonite. The demulsifying agent is obtained. The demulsifier is safe and environment-friendly, and can repeatedly and efficiently realize demulsification.

The invention relates to the technical field of wastewater treatment, and discloses a full-membrane treatment device for industrial wastewater, comprising a sedimentation tank, a support platform fixedly connected to the left surface of the sedimentation tank, a water pump fixedly connected to the upper surface of the support platform, a membrane filter connected to the rear end flange of the water pump, a material spreading box hinged on the inner wall of the sedimentation tank, a feed pipe fixedly connected to the left side of the material spreading box, and a discharge pipe fixedly connected to the bottom surface of the bulk material box. According to the invention, the material spreading area is increased by swinging the material spreading box, thereby increasing the contact area between the flocculant and the wastewater, and improving the mixing speed of the flocculant and the wastewater, and the twisting block drives the stirring rod to swing in a cone to stir the wastewater, so that the wastewater in the sedimentation tank quickly forms a vortex, further accelerating the mixing speed of the flocculant and the wastewater, and also accelerating the sedimentation speed of the flocculants, thereby improving the wastewater treatment efficiency.

The invention provides an intelligent town sewage treatment system which comprises a filter tank, a coarse screen filter device and a fine screen filter device are arranged in the filter tank, a vortex sedimentation tank is arranged in the outlet direction of the filter tank, and an oil stain separation tank is arranged on one side outside the vortex sedimentation tank. An oil foam discharging device is transversely arranged at the upper end of the oil stain separation tank, a biochemical reaction tank is arranged on one side outside the oil stain separation tank, the interior of the biochemical reaction tank is divided into an ammonification reaction zone, a nitration reaction zone and a denitrification reaction zone which are communicated in sequence, and a sludge separation tank is arranged on one side outside the biochemical reaction tank close to the denitrification reaction zone; a negative pressure pipe is transversely arranged in the sludge separation tank, the negative pressure pipe is communicated with a plurality of porous supporting pipes which are horizontally arranged, an ultrafiltration membrane sleeve is sleeved outside each porous supporting pipe, and a sludge selection tank is arranged on one side outside the sludge separation tank. The sewage treatment system disclosed by the invention can effectively separate sludge from water, effectively improve the elimination speed of filamentous bacteria and effectively solve the problem of sludge bulking.

The application discloses a kind of dry gas seal structures of LEROC-elliptical groove, including the dynamic ring and static ring being oppositely arranged along the axial direction;Wherein, the outer diameter side is high-pressure intake side, and the inner diameter side is low-pressure outlet side. The end face of dynamic ring or static ring is uniformly arranged with several LEROC triangular grooves and elliptical grooves along the circumference, and each LEROC triangular groove and elliptical groove is equal-depth groove structure formed by different circumferential trajectories. A plurality of micro-textures are provided in the sealing dam area, and the micro-textures are uniformly distributed in an array along the circumferential direction. The structure enhances the gas film dynamic pressure effect through the synergistic effect of LEROC-elliptical composite groove type, improves the opening capacity of the sealing surface, and effectively reduces the medium leakage. At the same time, it has the advantages of simple processing technology, high running stability and suitable for bidirectional rotation, and is suitable for popularization and application in dry gas seal devices under high-speed working conditions.

The application discloses a safe and controllable new VHP sterilization process. The process first introduces isopropyl alcohol gas into a closed space to build a pre-adsorption layer on the surface of materials to change the interfacial tension; then, vaporized hydrogen peroxide is introduced to spread and form a continuous micro-condensed liquid film, thereby reducing the mass transfer resistance of inward penetration; in the sterilization maintenance stage, ammonium bicarbonate thermal decomposition gas is injected to make the mixed gas dissolve into the liquid film across the interface and build a weak alkaline buffer environment, induce hydrogen peroxide to dissociate into hydroxyl radical anion to promote the killing process; pure steam is introduced in the early stage of exhaust analysis to maintain high humidity in the environment, so that the micro-condensed liquid film remains in a homogeneous liquid state, promotes in-situ degradation of residual hydrogen peroxide and avoids crystallization and precipitation of solid carbonate, and finally, low dew point dry air is used for gas replacement. The process improves the mass transfer efficiency of the gas-liquid interface, and to some extent, relieves the long tail release phenomenon of residual substances in the exhaust stage.