40results about How to "Improve interception effect" patented technology

The garden water-saving road comprises a roadbed and drainage pipelines arranged on the two sides of the roadbed, sewage intercepting structures are arranged on the drainage pipelines, a collecting channel is arranged on one side in each drainage pipeline, and each sewage intercepting structure comprises a sewage intercepting net between the corresponding drainage pipeline and the corresponding collecting pipeline and a drainage cover plate arranged on the corresponding drainage pipeline. Filtering holes are formed in the sewage intercepting net at intervals, and the aperture of the filtering holes, close to the drainage pipeline, below the sewage intercepting net is smaller than that of the filtering holes above the sewage intercepting net; water taking holes are formed in the collecting channel at intervals. Water entering the collecting channel is filtered in a classified mode through the sewage intercepting net with different hole diameters, silt and the like deposited at the bottom of the drainage channel are further intercepted through the filtering holes with the small hole diameters, the impurity removal effect on the water flowing into the drainage channel is improved, the water quality is improved so that the water can be recycled for garden irrigation and the like, and water saving is facilitated; when the abutting plate rotates to be staggered with the drainage cover plate, the drainage cover plate can be conveniently opened to clean silt and the like deposited in the drainage channel, and operation is more convenient.

The application discloses a regenerated cationic cellulose-based composite filter membrane and a preparation method and nanometer plastic removal application thereof, and belongs to the technical field of regenerated cellulose water treatment filter materials. In the application, a sodium hydroxide-urea-thiourea ternary system is used to fully dissolve cellulose, the cellulose is modified by 2,3-epoxypropyl trimethylammonium chloride cation, a PVDF membrane is used as a base, and a hydrophilic composite filter membrane is prepared by vacuum filtration and loading of a cationized cellulose layer. The preparation process is mild, and the defects of the traditional cellulose membrane, such as insufficient dissolution, uneven pore size and poor screening precision, are solved. The filter membrane surface is positively charged, the hydrophilicity is greatly improved, the water contact angle is only 39°, the particle size of 50-500 nm carboxylated nanometer plastics can be efficiently intercepted, the removal efficiency of 100 nm polystyrene nanometer plastics reaches 97.01%, and the water flux is excellent. The process is green and low-cost, can remove polystyrene, polymethyl methacrylate and polyvinyl chloride nanometer plastics in a wide range, and has a good engineering application prospect in the field of deep treatment of water body nanometer plastic pollution.

The invention discloses a heteromorphic covalent organic framework membrane as well as a preparation method and application thereof, and belongs to the technical field of separation membrane materials. The method comprises the following steps: firstly, synthesizing a COF nanosheet colloidal solution through a homogeneous solution method; then carrying out suction filtration on the colloidal solution to a porous supporting base membrane to form a crystalline COF layer; and finally, growing an amorphous COF layer on the surface of the crystalline COF layer in situ through interfacial polymerization, and carrying out heat treatment to obtain the heteromorphic covalent organic framework film. According to the invention, the rigid crystalline COF is used for providing a long-range ordered pore channel, the flexible amorphous COF is used for strengthening the controllable processability to make up the defect, a rigid-flexible heteromorphic configuration is formed, and the construction of the continuous defect-free COF film is realized. The preparation method is simple, the characteristics of a crystalline state and an amorphous state are coupled, a multi-layer sub-nanometer mass transfer channel is formed in the membrane, high permeability and high rejection rate are shown in the separation process of organic pollutants in water, and good long-term separation stability is achieved.

The utility model discloses an air cleaner of automobile engine, including the shell, its characterized in that, is provided with filter assembly in the shell, and the top of shell is equipped with the central pipe, filter assembly includes the upper end cover and lower end cover of interval arrangement, is equipped with the through -hole of central pipe crossing on the upper end cover, is equipped with the support net between the upper end cover and lower end cover, the inboard of support net is equipped with the first filter paper, and the first filter paper is transverse folding shape, the outboard of support net is equipped with the second filter paper, and the second filter paper is longitudinal folding shape, and the both ends of support net, first filter paper and second filter paper are fixedly connected with upper end cover and lower end cover respectively, the utility model discloses is equipped with the support net between the upper end cover and lower end cover, and the inboard of support net is equipped with the first filter paper, and the first filter paper is transverse folding shape, can effectively intercept most particulate impurities in air, and the outboard of support net is equipped with the second filter paper, and the second filter paper shows longitudinal folding shape, and the remaining impurities in air are filtered secondly, thereby improve the filter quality of filter.

The utility model discloses a solid-liquid separation system, which belongs to the technical field of sewage treatment and comprises a box body, the inside of the box body is divided into a flowing cavity and a waste discharge cavity, sewage flows from the inside of the flowing cavity, and the lower end of the waste discharge cavity is communicated with the outside; the multiple separation grid plates alternately move between the flowing cavity and the waste discharging cavity, solid impurities can be intercepted from water flow when the separation grid plates are arranged in the flowing cavity, and the intercepted solid impurities can be poured into the waste discharging cavity when the separation grid plates move to the waste discharging cavity. According to the utility model, the plurality of separation grid plates can alternately move between the flowing cavity and the waste discharge cavity, the separation grid plates can automatically transfer to the waste discharge cavity to pour out the remained impurities after intercepting the impurities, and the other separation grid plates can move to the inside of the flowing cavity to realize the work of intercepting the impurities, so that the continuous operation is realized, and the separation efficiency is improved.

The utility model relates to the field of nitrogen making machines, in particular to an efficient molecular sieve adsorption type nitrogen making machine. The device comprises a reaction cylinder, and an inner cylinder is fixedly connected to the interior of the reaction cylinder. The conical filter plate in the treatment mechanism is in a big-end-down shape, impurities in gas can be effectively filtered out, the unique shape of the conical filter plate can guide the impurities to slide to the flow guide groove along the inclined face, then the impurities are collected in a centralized mode through the collecting cavity, the impurities are prevented from entering the inner cylinder to affect the performance of the molecular sieve, and the purity of gas treatment is guaranteed; the nitrogen generation efficiency and quality are improved; moreover, the driving motor drives the conical filter plate to rotate, so that the gas treatment efficiency and quality of the nitrogen making machine can be remarkably improved, the contact frequency of the surface of the conical filter plate and impurities in the gas is greatly increased in the rotating process, and the impurity intercepting effect is remarkably enhanced; and meanwhile, the impurities are promoted to move towards the edge of the filter plate and slide to the diversion trench along the inclined surface due to the centrifugal force.

The utility model discloses a kind of air conditioner condensate water recycling devices, it is related to condensate water recycling technical field, including water collecting pool, the import of water collecting pool is connected with the drainage port of air conditioning unit via water collecting pipeline, the outlet of water collecting pool is connected with the water inlet of cooling tower via drive source;Filtering water tank for filtering impurities in its pipeline is arranged on the water collecting pipeline, filtering element is arranged in filtering water tank, so as to divide the tank cavity of filtering water tank into the front cavity connected with the water inlet of filtering water tank and the rear cavity connected with the water outlet of filtering water tank, and the rear cavity bottom height is lower than the front cavity bottom height.The water collecting pipeline in the utility model is directly connected with air conditioning unit and cooling tower, forms closed loop recycling path, ensures that condensate water is directionally transported;Filtering water tank is arranged in recycling path simultaneously, two-stage filtering element built-in filtering water tank is arranged in water flow direction in turn, realizes progressive interception of physical impurities, provides the water supply source of preliminary purification for cooling tower.

The application discloses a continuous production equipment and method of e-PTFE bidirectional stretching tubular membrane, belongs to the technical field of filter membranes, and comprises a control system, a conveying device, an extruder, a degreasing stretching box, a traction machine, a fixed jacket, a jacket assembly device, a radial stretching core rod, a core rod assembly device, a high-temperature stretching box, a core rod dismounting device and a jacket dismounting device; the continuous production equipment of the e-PTFE bidirectional stretching tubular membrane is high in automation, can realize twice axial stretching and once radial stretching of a tubular body in combination with a specific method, and prepares the e-PTFE bidirectional stretching tubular membrane which is more uniform in three-dimensional fluffy membrane hole, node and fiber distribution, higher in porosity and better in interception effect.

The present application relates to a kind of system and method for oxidizing treatment of radioactive waste resin in molten salt bath, including pretreatment unit, feed unit, high-temperature reaction unit and discharge unit, the pretreatment unit is used to control the moisture content of radioactive waste resin to be treated below 15%, and the radioactive waste resin with moisture content below 15% is transported to high-temperature reaction unit;The feed unit is used to transport oxidizing gas, inert gas and carbonate to high-temperature reaction unit;The high-temperature reaction unit includes melting furnace, the melting furnace is used to oxidize the radioactive waste resin transported by feed unit in high-temperature molten salt bath, and the radioactive waste salt obtained after treatment;The discharge unit is used to receive the radioactive waste salt obtained after treatment in melting furnace.Compared with prior art, the present application has the advantages of high decomposition efficiency of radioactive waste resin, significant volume reduction effect, reduced entrainment of radioactive waste, better safety and the like.

The application provides a split-hole plate type grid cleaner and relates to the technical field of water treatment equipment, which solves the technical problems of easy clogging, low interception efficiency and grid residue leakage in the prior art. The device is a split-hole plate type grid cleaner, which comprises a grid mechanism, a plurality of alternately arranged first plates and second plates, a plurality of filter holes respectively arranged on the contact sidewalls of the first plates and the second plates, a box body composed of two symmetrically arranged box plates, a plurality of back-shaped sliding grooves respectively arranged on the opposite inner sidewalls of the two box plates, a cleaning mechanism for automatically cleaning the first plates and the second plates, a conveying system comprising a transmission conveying mechanism and a cleaning conveying mechanism, the transmission conveying mechanism is used for driving the first plates and the second plates to circularly move along the back-shaped sliding grooves, and the cleaning conveying mechanism is used for accelerating the driving of the plates when the plates reach below the cleaning device, so that the first plates and the second plates are separated, and the cleaning device can efficiently clean the surfaces of the plates.

This invention relates to the field of membrane separation technology, and discloses a composite separation membrane, its preparation method, and its application. The composite separation membrane includes: a reinforcing layer and a support layer and a separation layer sequentially attached to the surface of the reinforcing layer; wherein, the crosslinked polymer forming the separation layer includes structural unit A provided by an amino compound and structural unit B provided by an epoxy compound; wherein, the epoxy compound is a compound containing 2-6 epoxy groups; the composite separation membrane is stable in acidic and alkaline solutions and organic solvents, and has the characteristics of high water flux and high organic solvent flux while having good retention performance.

This invention relates to a passive defense-based unmanned surface vessel (USV) swarm interception method, comprising the following steps: establishing motion models of the defending and attacking USVs based on the speed and maneuverability differences between the defender and attacker; defining the strike radius and defense radius, where objects approaching within the USV's strike radius will be destroyed; the defense radius being the distance between the defending USV and the target point; predicting the path of the attacking USV using a passive defense method; assigning task targets to the defending USV swarm using a heuristic task allocation search algorithm; the attacking USV employing an improved artificial potential field method for path planning and dynamic obstacle avoidance to evade the interception by the defending USVs; and evaluating the USV swarm interception effectiveness based on multiple interception effectiveness evaluation indicators. Compared with existing technologies, this invention can utilize the swarm advantage and positional advantage of the defender to compensate for its speed disadvantage, thus better executing the interception mission.

The application relates to the field of municipal roads and water supply and drainage systems, and discloses an assembled drainage device for municipal roads, which comprises a drainage ditch body, a support frame, a drainage cover plate, a collecting frame, a connecting rod trigger mechanism and a limiting warning block. The support frame under the drainage cover plate is in contact with the drainage ditch body but is not connected with the drainage ditch body, and the two are in a decoupled state capable of relatively sliding. When the ground base is settled, the support frame is overlapped on the road surface and does not sink with the drainage ditch body. The drainage ditch body sinks and pulls down the connecting rod trigger mechanism, so that the inside of the connecting rod trigger mechanism is forced to rotate, and then the limiting warning block is pushed upward to expose the warning piece on the road surface, early visual early warning in a pure mechanical mode is realized, in addition, the inner wall of a plug-in groove at the plug-in joint of adjacent drainage ditch bodies is provided with an inflatable sealing ring made of water-swelling rubber material. When a gap is generated due to settlement and pulling, the inflatable sealing ring is self-adaptively filled and sealed by water swelling. The application effectively solves the technical defects that the existing rigid device cannot give early warning of settlement and joint water leakage.

The invention discloses a method for removing high-valence ions and organic matters in a lithium-rich solution of brine, which comprises the following steps: carrying out first nanofiltration separation on the lithium-rich solution with the pH value of 3.0-6.0, carrying out second nanofiltration on a first trapped fluid to further separate and recover lithium, and carrying out third nanofiltration on the first trapped fluid and a first permeate to realize deep removal of the high-valence ions and the organic matters. According to the invention, three-stage nanofiltration is subjected to series-parallel configuration and design, so that the separation effect of lithium ions, foreign ions and organic matters is improved; an electric field is arranged to strengthen the nanofiltration process driven by pressure, the solute hydration state difference and the mass transfer rate are enhanced, and the separation performance is improved. According to the method provided by the invention, the removal rate of high valence ions in the lithium-rich liquid is gt; 99.9%, and the organic matter removal rate gt; and the lithium ion flux is improved by more than 20%. The process and the strengthening measure are a separation method with high universality, impurity ions and organic matters in different types of lithium-rich solutions can be removed, and large-scale industrial popularization is facilitated.

This application discloses a data risk prediction method and related products. The method includes: acquiring target data; inputting the target data into a risk prediction model to obtain the risk prediction result of the target data output by the risk prediction model; the risk prediction model is trained using a modified GRPO reinforcement learning method; the modified GRPO reinforcement learning method includes a dynamic asymmetric reward function and a dynamic asymmetric penalty function; this application effectively solves the problem of traditional auditing models treating "missed reports" and "inappropriate wording misjudgments" as the same through a dynamic mechanism of "heavy penalties for high-risk, light penalties for low-risk, high-confidence rewards, and low-confidence suppression," significantly enhancing the model's sensitivity and interception capabilities for major security risks during training, and greatly improving the accuracy and reliability of data risk prediction.

The present application relates to the technical field of water treatment materials, and particularly relates to a double-crosslinking modified MXene-based self-supporting composite membrane and a preparation method and application thereof.The present application comprises the following steps: (1) preparation of functionalized modified nanosheets: dissolving an amino-containing compound in a buffer solution to form a dispersion liquid, adding MXene nanosheets to the dispersion liquid to react, and obtaining functionalized modified MXene nanosheets; (2) preparation of a composite membrane: mixing the dispersion liquid of the functionalized modified MXene nanosheets with a dispersion liquid of a hydrophilic polymer compound, taking a porous polymer filter membrane as a substrate, and performing vacuum filtration to form a membrane, thereby obtaining a double-crosslinking modified MXene-based self-supporting composite membrane.The present application provides a MXene-based self-supporting composite membrane which has superhydrophilicity, high water flux, excellent dye interception capacity and good recycling stability, and can effectively treat dye-containing organic wastewater.

The application relates to the field of membrane separation technology, in particular to a virus-removing hollow cellulose membrane and a preparation method thereof. By adjusting the surface tension ratio among a casting solution, a core solution and a coagulation bath, the pore size of the finally obtained virus-removing hollow cellulose membrane is controlled. The prepared membrane has excellent virus retention capacity and maintains high water flux, high protein recovery rate and superior mechanical performance. The method in the application greatly reduces the difficulty of preparing the virus-removing hollow cellulose membrane by using natural cellulose as raw material, and greatly improves social benefits.

The present application relates to the technical field of air duct, especially to a multifunctional air duct based on golf ball surface for reducing noise and air resistance. The technical problem to be solved is that the existing air duct cannot intercept and clean the impurities carried in the airflow when the air duct is ventilated, which reduces the indoor air quality, and the airflow circulating in the air duct cannot be noise-reduced, and the noise generated in the air duct causes people to be unable to concentrate on work. The technical scheme is as follows: a multifunctional air duct based on golf ball surface for reducing noise and air resistance, which comprises a pipeline and a flange; the pipeline is provided with a flange for fixing the pipeline. The golf ball surface structure formed by the first recesses reduces the range of the tail flow of the air guide, which is beneficial to reduce the resistance when the air guide moves backward, and the second recesses reduce the range of the tail flow passing through the air guide, which is beneficial to reduce the noise generated when the airflow passes through the air guide.

The utility model relates to the technical field of water conservancy projects, and discloses an underwater bubble curtain sediment intercepting device which comprises a fixing plate, the top wall of the fixing plate is fixedly connected with an air compressor, a flow meter is fixedly installed on the left side of the bottom of the air compressor, and the bottom end of the flow meter is communicated with a conveying pipe. The rear end of the conveying pipe is fixedly connected with a valve, the rear end of the valve communicates with a connecting pipe, the rear end of the connecting pipe communicates with a connecting shell, the top wall of the connecting shell communicates with a plurality of spraying pipes at equal intervals, the bottom of the connecting shell is fixedly connected with a base, and the left side and the right side of the top of the base are each provided with a limiting assembly. According to the utility model, high-pressure airflow passes through a plurality of spray pipes to output bubbles, so that the bubbles which are continuously released can change a surrounding flow field, vertical circulation is formed on two sides of a bubble curtain by continuous aeration, silt is limited on one side of muddy water under the action of the circulation, and further ship navigation is prevented from being hindered.

This utility model discloses a cooling device for liquor raw materials, including a tank. A stirring mechanism is installed at the top of the tank. A feed pipe is fixedly installed at one end of the tank, and a discharge pipe is fixedly installed at the bottom. A first heat dissipation hole is evenly distributed around one end of the tank. A protective sleeve is welded and fixed to one end of the tank, located at the end of the first heat dissipation hole. A second heat dissipation hole is evenly distributed around one end of the protective sleeve for heat dissipation. This utility model directly intercepts dust through a porous structure, preventing it from entering the tank. The staggered arrangement of the first and second heat dissipation holes forms a tortuous airflow path, increasing the probability of dust impacting and adhering to the filter screen, thus enhancing the interception effect. The inclined design at the bottom of the filter screen allows dust to slide off automatically using gravity, preventing accumulation and blockage on the filter screen surface, ensuring smooth ventilation, and continuously maintaining interception performance. This effectively isolates dust, ensures the heat dissipation efficiency of the cooling device, and extends the service life of the equipment.

This utility model discloses an integrated arc extinguishing and arc suppression device and a circuit breaker having the same, including an arc extinguishing chamber unit and an arc suppression chamber unit. The arc suppression chamber unit is integrally connected to the arc extinguishing chamber unit through a set of mounting side plates, and an extension baffle is formed by the set of mounting side plates extending towards the circuit breaker wiring port. The mounting side plates and the extension baffles are integrally formed to constitute the side walls of the arc extinguishing chamber unit and the arc suppression chamber unit, respectively. In this integrated structure, the ends of the extension baffles directly cover the inner walls on both sides of the wiring port, forming a continuous arc extinguishing cavity and an arc suppression cavity, completely eliminating the gaps caused by assembly, structurally blocking the path of arc escape, and improving the overall arc extinguishing and arc suppression efficiency. The integrated arc extinguishing chamber and arc suppression chamber structure significantly compresses redundant space, improves the internal layout compactness without increasing the overall volume of the circuit breaker, and significantly improves the cabinet space utilization rate.

The application relates to the sewage treatment technical field, in particular to a granular sludge self-circulation reactor capable of preventing backflow channel blockage, which comprises a reactor tank body, a gas discharging mechanism, a granular sludge interception mechanism and a self-circulation channel, wherein the reactor tank body is a cylindrical barrel structure, the inside of the reactor tank body is sequentially provided with a gas discharging area, a granular sludge accumulation area and a reaction zone from top to bottom; the gas discharging mechanism comprises an inverted conical gas collecting cover, a gas collecting pipeline and a gas discharging pipe, and the surface of the gas collecting cover is provided with gas flow-through holes. The application can timely discharge the gas in the gap of the granular sludge, maintain the sedimentation performance of the sludge, effectively intercept the granular sludge through the gradient interception structure, and prevent the backflow channel from being blocked through the flow guide plate and the backflushing nozzle.

The utility model provides waste collecting vehicle of flat press flat die cutting machine, frame body, accommodate opening of setting in the front end of frame body, the airflow screen board of setting in the back of frame body, set up in the intercepting subassembly of accommodating opening in frame body on, airflow screen board can discharge and prevent waste to pass through, can play the pressure relief effect to airflow and prevent the contained waste to be disturbed by airflow and fly out frame body, and after waste enters the accommodating opening, waste will first contact with intercepting subassembly and thereby intercepts waste to prevent waste from sticking to airflow screen board and forming blockage, thereby reach the effect of waste collection and airflow pressure relief, improve the collection effect to waste, can concentrate collection to the discharged waste through the scheme, and the phenomenon that the personnel slip and fall and get hurt is not easy to appear because of the scattered waste, and safety production is not easy to be influenced.

The application discloses a process for treating dyeing wastewater by a membrane method, and comprises the following steps: pretreating the dyeing wastewater, including grating, adjusting pool, coagulation and sedimentation, and filtration, to obtain filtered wastewater; the filtered wastewater enters a security filter to be subjected to secondary filtration, to obtain secondary filtered wastewater; the secondary filtered wastewater enters an NXF membrane system, and the wastewater is divided into two streams, one of which is a concentrated solution which does not reach a set concentration, and the other of which is a permeate; the concentrated solution which does not reach the set concentration returns to a front end inlet to be subjected to filtration in the NXF membrane system again; when the concentration reaches the set concentration, the concentrated solution enters a concentration storage tank to be subjected to other treatment; and the permeate enters subsequent treatment. The application aims at solving the technical problem of poor treatment effect of dyeing wastewater.

The utility model relates to water body ecological management equipment technical field especially relates to a kind of floating type wave-damping enclosure for water body ecological management, including rubber enclosure and floating shell assembly;Rubber enclosure is long strip flexible structure, and is laid along the preset boundary of water body management area;Floating shell assembly is symmetrically arranged in rubber enclosure both sides, and floating shell assembly is evenly spaced along the length direction of rubber enclosure There are several, provide stable buoyancy support for rubber enclosure;Floating shell assembly includes floating shell body, and floating shell body is lightweight structure with hollow inside, it uses high-density polyethylene material, satisfies the long-term use demand of water body ecological management;The utility model realizes the relative independence of target water body area and external water body by physical isolation mode, and then efficiently intercepts suspended pollutants, algae and the like in water body, guarantees the accurate implementation of ecological management measure, and can be widely applied to water body eutrophication management, pollution water body emergency management and control, ecological restoration subarea division and the like scene.

The utility model relates to the technical field of oriented silicon steel production, and discloses an oriented silicon steel heating mantle protective gas supply structure which comprises a heating mantle, a connecting pipe is fixedly connected to the bottom of one side of the heating mantle, a filter box is installed on the side, away from the heating mantle, of the connecting pipe, and a first installation plate is fixedly connected to one side of an inner cavity of the filter box. And an annular filter screen penetrates through and is rotationally connected with the middle part of the mounting plate I. According to the utility model, after the motor is started, the driving gear rotates to drive a series of linkage parts, so that the rotating ring I and the rotating ring II slowly rotate, and the annular filter screen and the annular sponge filter screen rotate along with the rotating ring I and the rotating ring II; the rotation of the annular filter screen ingeniously solves the impact of airflow on a single position, the filtration is not limited to local parts but is uniformly and efficiently spread, the capability of intercepting dust and impurities is greatly improved, meanwhile, the shovel plate is tightly attached to the annular filter screen under the action of the tension spring, dust on the annular filter screen is removed, and the service life of the annular filter screen is prolonged. And the filter screen is prevented from being blocked for a long time.

The utility model discloses a sewage treatment device with a self-adaptive filter material interception function, and relates to the technical field of sewage treatment. Comprising a filter tank main body, a water inlet pipe and a water outlet pipe which are communicated with the filter tank main body are respectively mounted on two sides of the filter tank main body, a filter area is arranged in the filter tank main body, a filter material intercepting assembly is arranged in the filter area, and backwashing assemblies are arranged at the bottom and the top of the filter tank main body. By arranging a fixed filter material frame, a movable filter material frame and an electric telescopic rod, the tightness degree of a filter material layer can be adjusted during backwashing, the loss of a filter material in the backwashing process is effectively reduced, the service life of the filter material is prolonged, and the operation cost is reduced; the filter materials are prevented from being mixed in the backwashing and normal operation processes, the stability of the filtering effect is guaranteed, and the filter material blocking grids formed by the multiple groups of blocking strips arranged on the grid plate further enhance the intercepting effect on the filter materials and prevent the filter materials from being washed away.

This invention provides a composite nanofiltration membrane, its preparation method, and its application, belonging to the field of pollutant removal technology. The invention first coats the surface of a macroporous base membrane with a high molecular weight polyelectrolyte system to cover the macropores, then fills the micropores of the base membrane with a low molecular weight polyelectrolyte. This improves the retention rate of micropollutants in the layer-by-layer self-assembled membrane, reducing pore size while maintaining high permeability. This invention prepares a multilayer composite nanofiltration membrane by coating polyelectrolyte systems of different molecular weights onto a high-porosity base membrane and repeating the coating process. The prepared composite nanofiltration membrane achieves a removal rate of over 90% for micropollutants with a molecular weight of around 200 Da, with a maximum removal rate of 99.8%.

This invention relates to the field of polymer materials technology, specifically to a polyimide resin soluble in alkaline aqueous solution, its preparation method, and its applications. The resin comprises structural unit I derived from a carboxyl-substituted diamine compound, structural unit II derived from a tetracarboxylic dianhydride compound, and structural unit III derived from a non-carboxyl-substituted diamine compound. The molar ratio of structural unit I, structural unit II, and structural unit III is 1:2~4:1~3. This polyimide resin possesses excellent water solubility, thermal stability, and mechanical properties, and its preparation process is environmentally friendly, meeting the application needs of various fields.

The utility model provides a kind of for wharf clean warehouse oil deashing device, including tank, the outside wall of the tank is fixedly equipped with three supporting legs, the top of the tank is fixedly installed with stirring motor, the top of the tank is equipped with feed pipe, the bottom of the tank is provided with discharge bin, the outer wall of the discharge bin is fixedly installed with discharge pipe being communicated with it, the inside of the tank is divided into stirring cavity and deashing cavity by the partition board in the middle, the output shaft of the stirring motor is equipped with rotating shaft, which penetrates stirring cavity and is located in deashing cavity at bottom end, the inside of the deashing cavity is provided with separation assembly. Through the conical structure and guide trench design of dispersion cylinder, the problem that clean warehouse oil rapidly accumulates and distributes unevenly after entering deashing cavity is effectively solved, so that clean warehouse oil is evenly dispersed in deashing cavity, and the double filtration of separation cylinder and separation plate in separation assembly is combined with the secondary filtration of multiple filter screens in filter box on discharge pipe, to improve oil quality.