144 results about "Flat sheet membrane" patented technology

The invention discloses a desulfurizing tower and a desulfurizing method based on enhanced absorption of flat sheet membrane internals. The desulfurizing tower comprises a desulfurizing tower body, and a liquid distributor, the flat sheet membrane internals and fractal internals which are sequentially arranged in the desulfurizing tower body from top to bottom, according to the invention, high-concentration sulfur-containing gas is subjected to rapid pre-desulfurization at the tower bottom by utilizing the high turbulence characteristic of the fractal internals, so that the sulfide concentration can be instantly reduced, and the gas flow distribution is optimized; and the pre-desulfurized gas then enters a high-efficiency fine desulfurization area formed by the flat sheet membrane internals. According to the flat sheet membrane internal part, a plurality of vertically arranged flat sheets are utilized to form a fixed gas flowing channel, so that transverse movement of gas molecules is limited, and gas distribution is more uniform. And meanwhile, a layer of uniform and continuous absorbent liquid film is formed on the surface of the flat plate, so that the gas-liquid contact area is remarkably increased, and high efficiency and low energy consumption are achieved through full countercurrent contact and efficient gas-liquid mass transfer of gas and the absorbent liquid film under extremely low pressure drop.

The invention belongs to the technical field of sewage treatment and membrane separation, and provides an in-situ nondestructive membrane pollution detection system and method based on an ultrasonic transmission signal, and the system comprises an ultrasonic excitation module which is used for generating a sine wave excitation signal which penetrates through a membrane body to excite the ultrasonic transmission signal for pollution detection; the signal processing module is used for continuously collecting and preprocessing ultrasonic transmission signals of the clean membrane body and the membrane bodies with different pollution degrees, extracting ultrasonic transmission signal characteristics under different pollution degrees, and establishing a pollution thickness-signal characteristic mapping model; wherein the ultrasonic transmission signal features comprise a time-frequency domain energy gravity center feature and a frequency attenuation spectrum slope feature; and the pollution detection module is used for judging the pollution stage of the membrane body to be detected based on the pollution thickness-signal feature mapping model, and completing in-situ nondestructive membrane pollution detection. According to the technical scheme, the sludge pollution state in the ceramic membrane and flat membrane filtering process can be monitored in real time, and early warning and pollution dynamic tracking are achieved.

The invention discloses a flat plate membrane internal part for an absorption tower and the absorption tower. The flat plate membrane internal part comprises a plurality of vertically arranged flat plates and a supporting assembly for supporting and fixing the flat plates, a flow channel is formed between adjacent flat plates; the flat sheet membrane internal part comprises the following three structures: (I) the surface of a flat sheet is provided with continuous convex or continuous groove lines; the supporting assembly is an external frame; (2) discontinuous raised lines are arranged on the surface of the flat plate; the supporting assembly is an external frame; and (3) the supporting assembly comprises a plurality of connecting columns, and the adjacent flat plates are supported and fixed through the connecting columns arranged in a staggered mode. A fixed flowing channel in the flat sheet membrane internal part structure limits transverse movement of gas molecules, and uniform gas-liquid countercurrent contact is achieved. Meanwhile, by optimizing surface geometric lines and arrangement modes of the flat plates and the form of the supporting assembly, the gas-liquid contact area is further increased, the gas-liquid contact time is further prolonged, the gas-liquid mass transfer efficiency in the tower is improved, the pressure drop in the tower is reduced, and the energy consumption of the system is reduced.

The invention discloses a deep desulfurization device and process based on an adjustable flat sheet membrane and intelligent cooperative control, the deep desulfurization device comprises a desulfurization tower and an intelligent adjustment and control system, a variable-configuration flat sheet absorption membrane device is arranged in the desulfurization tower body, and the variable-configuration flat sheet absorption membrane device is formed by arranging a plurality of groups of hydrophilic corrosion-resistant flat sheets in parallel; a plurality of blades with adjustable angles are uniformly distributed on one side or two sides of the flat plate, and can simultaneously drive the blades to synchronously and accurately rotate under the control of a motor driven by an intelligent control driver, so that the device can actively adjust the geometrical morphology and fluid mechanics conditions of a gas channel according to real-time working conditions; meanwhile, by means of the design of an absorbent circulation loop in the tower, the flow of the absorbent entering the desulfurization tower is dynamically adjusted, and therefore rapid response to working condition fluctuation and online optimization of the desulfurization process are achieved.

The utility model discloses a novel flat sheet membrane pressing device which comprises a pressing table, and the top of the pressing table is fixedly connected with a supporting frame. The linear moving platform is horizontally connected to the pressing table in a sliding mode, and a linear moving assembly is installed on the pressing table; the pressing mechanism is mounted on the supporting frame; the number of the material moving mechanisms is two, and the two material moving mechanisms are symmetrically arranged on the two sides of the supporting frame; the mold comprises an upper mold plate and a lower mold plate, the PVDF film is arranged between the upper mold plate and the lower mold plate, two sets of positioning assemblies are arranged on the linear moving platform, and the positioning assemblies are in limiting fit with the lower mold plate; the curves of the longitudinal sections of the upper die plate and the lower die plate comprise a plurality of arc-shaped sections and a plurality of linear sections, and the arc-shaped sections and the linear sections alternately form a corrugated structure. The PVDF film formed by pressing is large in surface pattern size, simple and easy to generate, and low in manufacturing cost.

The invention discloses a Pt-coated ZrO2-coated SiO2 catalytic ceramic membrane with a core-shell structure as well as a preparation method and application of the Pt-coated ZrO2-coated SiO2 catalytic ceramic membrane, and belongs to the technical field of advanced oxidation and water treatment. The method comprises the following steps: preparing platinum nano sol by an ethylene glycol reduction method; the preparation method comprises the following steps: coating Pt-coated ZrO2 core-shell particles with tetragonal phase ZrO2; the preparation method comprises the following steps: preparing a porous SiO2 shell, dispersing the porous SiO2 shell in an ethanol solution, adding tetraethoxysilane (TEOS), coating the porous SiO2 shell through a Stber method by taking cetyltrimethylammonium bromide (CTAB) as a template agent and ammonia water as a catalyst, and then roasting to remove the template agent to form Pt-coated ZrO2-coated SiO2 core-shell particles; the preparation method comprises the following steps: uniformly dispersing Pt-coated ZrO2-coated SiO2 core-shell particles in absolute ethyl alcohol to obtain a suspension, dipping a commercial alpha-Al2O3 flat sheet membrane in the suspension, taking out, drying, and sintering in an air atmosphere to obtain the Pt-coated ZrO2-coated SiO2 catalytic ceramic membrane with the core-shell structure. The ceramic membrane is high in catalytic activity, good in stability and large in membrane flux. The invention is applied to advanced treatment of algae-containing water and degradation-resistant organic wastewater.

The utility model discloses a multi-piece combined flat membrane component, which belongs to the technical field of environment-friendly sewage treatment equipment and structurally comprises a water collecting cavity frame body, a water outlet hole pipe, membrane units, inter-piece pressing rings, a pressing plate frame body, a screw rod, a nut and a screw rod lantern ring, due to the fact that the supporting plate with the thickness ranging from 0.1 mm to 2 mm is used or the diaphragm unit without the supporting plate is adopted, the manufacturing cost of the multi-piece combined type flat plate membrane assembly is greatly reduced compared with that of a vertical hard plate flat plate membrane assembly. During cleaning, the nuts on the screw rods can be unscrewed, and the membrane units can be detached for cleaning, so that the membrane can be cleaned more easily compared with a multi-piece integrated soft-piece flat-plate membrane assembly.

The invention discloses an automatic vision deviation rectifying mechanism for cutting a ceramic flat sheet membrane finished product, and relates to the technical field of ceramic membrane production, the automatic vision deviation rectifying mechanism comprises a device body, an auxiliary mechanism for rectifying deviation is arranged on the device body, and the auxiliary mechanism comprises a mounting frame, an auxiliary frame and two first electric push rods; an industrial camera is arranged in a square hole of the mounting frame, an optical lens is arranged at the bottom end of the industrial camera, an L-shaped plate is fixed to the lower side of the mounting frame, and a strip-shaped illuminating lamp is mounted on the upper side of the L-shaped plate. By arranging the auxiliary mechanism, automatic visual deviation correction operation can be conducted on the ceramic flat membrane substrate in the cutting process, and therefore the situation that due to manual positioning deviation correction or mechanical baffle positioning deviation correction, the consistency of the cutting size is poor or the cutting precision is affected is avoided.

The application is a ceramic flat plate membrane and end seal integrated co-sintering forming process, comprising the following steps: S1, preparing a ceramic flat plate membrane support; S2, preparing an end seal; S3, preparing a bonding slurry; S4, combined sintering: after the bonding slurry is coated on both ends of the support mud body, drying is performed, then the end seal green body is combined, and an integrated structure is formed through one-time sintering, after sintering is completed, end seal drawing performance and end seal air tightness detection are performed; S5, preparing a flat plate membrane. After the plastic end seal is upgraded to a homogeneous ceramic end seal, the ceramic membrane product has full water quality applicability, and the risk of end seal cracking and falling off is completely solved. At the same time, in the ceramic membrane sintering process, the "integrated co-sintering forming" process is adopted, and the ceramic end seal and the ceramic membrane body are prepared synchronously. This process saves the complicated processes such as post-sintering installation, glue bonding and curing waiting required by the traditional plastic end seal, and significantly improves the product reliability and production efficiency.

The invention provides an ultrafast laser artificial blood vessel microstructure preparation method and device, and relates to the field of medical and industrial crossing. Firstly, a flat sheet membrane is flatly laid on a machining table, an ultrafast laser is used for machining the upper surface of the flat sheet membrane to form a first microstructure, and then the flat sheet membrane is curled into a tubular structure; welding the two opposite sides of the flat sheet membrane together by using the ultrafast laser again to form an artificial blood vessel, so that the inner surface of the artificial blood vessel has a first microstructure, then sleeving the artificial blood vessel on a micro-shaft, and driving the micro-shaft to drive the artificial blood vessel to rotate, and finally, processing the outer surface of the artificial blood vessel by using an ultrafast laser to form a second microstructure, and taking down the artificial blood vessel from the micro shaft after processing to obtain the artificial blood vessel of which the inner surface and the outer surface are respectively provided with the first microstructure and the second microstructure. By using the method, the microstructures can be conveniently processed on the inner and outer surfaces of the artificial blood vessel, and the processing difficulty can be reduced.

The article to which this design relates is a membrane module having a filtration membrane element (e.g., hollow fiber membrane type, flat membrane type, etc.) inside, and used for industrial wastewater filtration, sewage filtration, pretreatment filtration for seawater desalination, etc.

The utility model discloses a dot-matrix type flat sheet membrane component, which belongs to the technical field of environment-friendly sewage treatment equipment, comprises a dot-matrix type vertical hard flat sheet membrane component, a dot-matrix type single-sheet flexible sheet flat sheet membrane component and a dot-matrix type multi-sheet integrated flexible sheet flat sheet membrane component in physical forms, and structurally comprises a membrane, a support plate and a mesh, the supporting plate is arranged in the middle, the meshes are arranged on the two faces of the supporting plate, the membranes are arranged on the outer sides of the meshes, the peripheries of the membranes and the meshes are connected with the supporting plate in a welding or bonding mode, and welding points or bonding points are arranged on the membranes every 20-80 mm. When the equipment is in a non-negative-pressure suction state, the outward bulging force of the diaphragm can be restrained by a welding point or a bonding point, so that the diaphragm cannot be wholly expanded outwards, and as the diaphragm is small in bulging amplitude, the probability of cracks and holes on the edge of the diaphragm can be reduced, and the probability of stabilizing the quality of effluent can be greatly improved.

The utility model discloses an MBR (Membrane Biological Reactor) flexible ultrafiltration flat sheet membrane, which belongs to the technical field of purification membranes, and adopts the technical scheme that the MBR flexible ultrafiltration flat sheet membrane comprises a wear-resistant antibacterial outer layer, a stress dispersion support layer is arranged at the bottom of the wear-resistant antibacterial outer layer, and an efficient ultrafiltration separation layer is arranged at the bottom of the stress dispersion layer. The bottom of the efficient ultrafiltration separation layer is provided with an elastic buffer damping layer, the bottom of the elastic buffer damping layer is provided with a corrosion-resistant anti-seepage inner layer, the wear-resistant antibacterial outer layer is arranged to inhibit bacterium breeding, prevent biological pollution, guarantee long-term cleanness of the membrane and avoid secondary pollution of effluent quality, the stress dispersion supporting layer provides strong supporting force, and the service life of the membrane is prolonged. The elastic buffer damping layer absorbs water flow impact energy, reduces membrane vibration and reduces the damage risk, the efficient ultrafiltration separation layer can accurately remove various micro pollutants including small molecules and special pollutants in water, and the advanced wastewater treatment requirements of specific industries are met.

The invention discloses a preparation method of a PVDF (polyvinylidene fluoride) modified flat sheet membrane, an ammonia separator and a waste gas treatment method, the PVDF flat sheet membrane is wetted by n-butyl alcohol and then immersed in a prepared mixed solution of sodium hydroxide and a nonionic surfactant, the PVDF flat sheet membrane taken out is washed and then immersed in a prepared silane coupling agent solution, and the PVDF modified flat sheet membrane is obtained. An ammonia separator comprises the PVDF modified flat sheet membrane, the waste liquid flows on the inner side of the PVDF modified flat sheet membrane after being atomized, and meanwhile, the outer part of the PVDF modified flat sheet membrane is vacuumized; the liquid inlet flow valve, the separation temperature and the separation pressure are adjusted to obtain separated ammonia gas, the ammonia gas enters the ammonia gas liquefier to finally obtain recycled liquid ammonia, the ammonia-containing waste gas is separated and recycled, and efficient treatment of the ammonia-containing waste gas and recycling of resources are achieved.

The invention discloses a desalted water deep deoxidization membrane assembly suitable for a gas-steam combined cycle generator set, which comprises a membrane support frame and a plurality of flat membranes, the flat membranes are supported and fixed by the membrane support frame, a plurality of membrane holes are formed in the flat membranes, and the membrane holes are communicated with the membrane support frame. The flat diaphragm prevents liquid water from passing through the diaphragm holes through surface tension of the flat diaphragm and allows oxygen to pass through the diaphragm holes, one side of the flat diaphragm is a water side runner opening adhesive layer, and the other side of the flat diaphragm is a gas side runner opening adhesive layer. According to the desalted water deep deoxidization membrane assembly suitable for the gas-steam combined cycle generator set, the tolerable temperature to inlet water can reach 160 DEG C or above, the tolerable degree to inlet water pressure can reach 2 Mpa, the membrane assembly is suitable for a desalted water deep deoxidization process with the dissolved oxygen content being lower than 100 ppb, the overall structure is simple and reasonable, and the membrane assembly is suitable for large-scale popularization and application. The method has great popularization and application values.

The invention discloses a symmetric polyether sulfone flat sheet membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The preparation method of the flat sheet membrane comprises the following steps: mixing 15-30 parts of polyethersulfone, 2-10 parts of polyvinylpyrrolidone and 60-80 parts of a cyclic lactam solvent in proportion, melting at 130-160 DEG C, casting to form a membrane, cooling and curing, extracting with hot water, and drying to obtain the symmetric polyethersulfone flat sheet membrane. According to the invention, the dissolution and separation film formation of the polyether sulfone material are realized through the melting and solidification process of the cyclic amide. An organic-solvent-free system containing a cyclic lactam solvent is adopted, no organic solvent exists in the whole process, zero VOC emission is achieved, and environment friendliness is achieved. The prepared separation membrane is of a complete spongy homogeneous structure, is uniform in pore diameter and free of finger-shaped pores, and has good pressure resistance, backwashing resistance and high flux performance. Compared with a traditional thermally induced phase separation method, the operation temperature is lower, and the energy consumption in the preparation process is remarkably reduced.

The invention belongs to the technical field of silicon carbide flat membranes, and particularly provides a high-electronegativity silicon carbide flat membrane material and a preparation method thereof. The invention relates to a preparation method of a high-electronegativity silicon carbide flat sheet membrane material, which comprises the following steps: mixing phytic acid and an organic solvent to prepare a precursor solution, impregnating a silicon carbide flat sheet membrane substrate with the precursor solution, carrying out a reaction, and carrying out stage heat treatment. The high-electronegativity silicon carbide flat sheet membrane material prepared by the method has high electronegativity in a wide pH range, the water permeation flux is high, and after multiple humic acid pollution-cleaning cycles, the flux attenuation is less, and the anti-pollution performance is good. When silica sol is added into the precursor solution, the electronegativity of the silicon carbide flat sheet membrane material can be further improved, so that the anti-pollution performance of the high-electronegativity silicon carbide flat sheet membrane material is further improved.

The application discloses an AnDMBR dynamic membrane assembly for sludge anaerobic digestion, which comprises a sealed membrane frame, a plurality of flat plate membranes and a plurality of detachable aeration pipes; the sealed membrane frame is used for bearing various components of the AnDMBR dynamic membrane assembly and is in the shape of a cuboid composed of a stainless steel grid; the plurality of flat plate membranes are arranged in parallel and equidistantly in the sealed membrane frame; a membrane water outlet is arranged above the flat plate membranes, and the height of the membrane water outlet is higher than the upper surface of the sealed membrane frame; the gap between the plurality of flat plate membranes is filled with conductive particles; the plurality of detachable aeration pipes utilize the circulating biogas from the air guide holes to form a cross flow on the surface of the flat plate membranes and disturb the conductive particles between the flat plate membranes. The application effectively solves the problem of flat plate membrane surface mud cake deposition caused by the operation of AnDMBR at high sludge concentration, prolongs the service life of the dynamic membrane assembly, and improves the anaerobic digestion performance of the reactor.

The utility model discloses a flat membrane component for MBR (membrane bioreactor), which relates to the technical field of sewage treatment and comprises two groups of aeration frames, membrane frames are arranged at the tops of the two groups of aeration frames, flat membrane bodies are arranged in the membrane frames in an array manner, and the surfaces of the two membrane frames are fixedly connected with a first support leg and a second support leg respectively. A positioning shell is fixedly connected to one side of the first supporting leg, a first positioning seat and a second positioning seat are fixedly connected to the bottoms of the first supporting leg and the second supporting leg respectively, and adjusting assemblies are arranged at the bottoms of the first positioning seat and the second positioning seat. The utility model has the beneficial effects that the two groups of aeration frames and membrane frames can be conveniently matched and quickly assembled through the mounting assembly, part of screws are replaced through a plug pin type quick-release structure, quick assembly is realized, and adjustable nuts are arranged through the adjusting assembly, so that the use angle and height of the bottoms of the aeration frames can be conveniently adjusted.

This invention belongs to the field of image processing technology, specifically relating to a method and system for visual recognition of physical damage on the surface of an MBR flat sheet membrane. The method includes: low-pass filtering a microscopic grayscale image to melt the micropore background; calculating a texture variation index based on the outlier degree of grayscale values ​​of neighboring pixels and the dynamic contrast gain of the neighboring grayscale; determining damage clustering weights using spatial attenuation accumulation values ​​to remove isolated noise points; fusing the texture variation index and damage clustering weights through an adaptive gating function to generate a damage confidence score; and finally, marking connected damage regions based on statistical threshold binarization and morphological processing. This invention effectively suppresses interference from dense micropores and improves the accuracy of physical damage recognition.

A membrane module comprising a cylindrical housing containing a plurality of flat sheet membranes oriented parallel with a longitudinal central axis of the housing, the edges of the one or more flat sheet membranes being embedded in a potting material.

The utility model relates to sewage treatment technical field, a kind of coal chemical industry wastewater ceramic flat sheet membrane water reuse system, including ceramic membrane pool, and ceramic flat sheet membrane is inside in ceramic membrane pool;Water production pool is connected to the filtration side of ceramic flat sheet membrane by water production pipe;Water production pump is set on water production pipe;Backwash pump input is connected with the water production pool by pipeline, and the output end of backwash pump is connected the sewage side of ceramic flat sheet membrane;Ceramic membrane pool bottom is equipped with sludge discharge pipeline, and sludge discharge pump is arranged on the sludge discharge pipeline.This technology handles coal chemical industry wastewater effect is good, and effluent quality water quantity is stable.

The invention discloses an anti-pollution vibration type MBR flat sheet membrane and a preparation method thereof. The flat sheet membrane comprises a composite membrane main body, and an anti-pollution modification layer and a vibration adaptation layer which are sequentially compounded on the composite membrane main body. The composite membrane main body is of a composite structure of a PTFE membrane layer and a fiber compound reinforced supporting layer; the anti-pollution modified layer is composed of a hydrophilic agent and nano antibacterial particles; the vibration adaptation layer is an elastic body layer provided with a vibration transmission structure. According to the invention, material hydrophilic antibacterial modification and a vibration energy efficient transfer structure are systematically integrated, so that the anti-pollution modified layer and the vibration adaptive layer form functional synergy on the composite membrane main body, and the pollutant desorption efficiency and the repollution resistance of the membrane surface are remarkably improved. Tests show that the membrane surface contact angle is less than or equal to 45 degrees, the flux recovery rate is greater than or equal to 95%, the membrane pollution rate is reduced by 88% or more, the vibration energy consumption is reduced by 60% or more, and the service life is prolonged to 5 years or more. The method can be widely applied to the fields of sewage treatment and resource utilization.

The invention relates to the technical field of ceramic membranes, in particular to a silicon carbide whisker surface modified aluminum oxide particle ceramic membrane and a low-temperature in-situ synthesis method thereof. The silicon carbide whisker surface modified alumina particle ceramic membrane is prepared from the following raw materials in percentage by mass: 70 to 90 weight percent of alpha-Al2O3 powder, 5 to 15 weight percent of silicon source, 5 to 15 weight percent of carbon source, 1 to 5 weight percent of sintering aid and 0.1 to 1 weight percent of catalyst. On one hand, the initial synthesis temperature of the SiC whiskers is reduced by adopting the combined catalyst, and the method adapts to a low-temperature sintering schedule of an aluminum oxide ceramic flat sheet membrane. On the other hand, a low-temperature in-situ synthesis method for modifying the aluminum oxide particles on the surfaces of the silicon carbide whiskers is adopted, the aluminum oxide particles are wrapped by the SiC whiskers to form a core-shell structure, and the hydrophilicity and chemical stability of the aluminum oxide ceramic membrane are improved.

The utility model provides a flat sheet membrane drying system which comprises a fan heater, a dehumidifier and a drying device, the drying device comprises a drying unit, a drainage unit arranged below the drying unit and an air exhaust unit arranged above the drying unit, the drying unit is communicated with the fan heater through a pipeline, and the air exhaust unit is communicated with the dehumidifier through a pipeline; the drying unit comprises a plurality of first air knives arranged at intervals and second air knives arranged below the first air knives, gaps allowing the flat sheet membrane to pass through are formed between air outlets of the first air knives and air outlets of the second air knives, the plane where the flat sheet membrane is located serves as a reference plane, and the air outlets of the first air knives are downwards inclined; the air outlets of the second air knives are obliquely arranged upwards, the air outlet direction of the first air knives and the air outlet direction of the second air knives are crossed in space, and the crossing angle ranges from 45 degrees to 90 degrees. The flat sheet membrane drying device can quickly dry a flat sheet membrane, improves the drying efficiency, gets rid of the limitation of traditional natural drying, and can meet the requirement of large-scale production.

The invention relates to the technical field of sewage treatment equipment, and discloses integrated equipment for treating high-concentration livestock and poultry breeding wastewater, the integrated equipment comprises a treatment pond, a fixed box is fixedly mounted at the bottom of the treatment pond, and a plurality of flat sheet membranes are arranged on the inner side of the fixed box; a plurality of communicating grooves are formed in the front face, the back face and the bottom face of the fixing box, and the top of the fixing box is of an open structure. The flat sheet membranes in different fixed boxes are cleaned in turn, the opening and closing states of the communicating grooves are changed by moving the movable plates, and during chemical backwashing, the peripheries and the bottoms of the fixed boxes are closed to form sewage separation of the treatment tank, so that backwashing and chemical washing are performed in a non-stop state, and the treatment efficiency is improved. The operation continuity of the whole sewage treatment line is guaranteed, the amount of sewage needing to flow back is reduced, the cleaning efficiency is improved, meanwhile, additional treatment loads generated at the front end are avoided, and the requirement for continuously treating a large amount of breeding sewage within a short time is met.

The invention relates to the technical field of membrane materials, and discloses a preparation method and application of a metal organic framework surface modified flat sheet membrane, the preparation method of the metal organic framework surface modified flat sheet membrane comprises the following steps: step 1, preparing MMOF nanoparticles; step 2, preparing liquid PFS; step 3, preparing a PFS-MMOFs dispersion liquid; 4, material surface modification; 5, material surface post-treatment: soaking a pre-treated flat sheet membrane substrate in the PFS-MMOFs dispersion liquid obtained in the step 3 for a seventh preset time, taking out the flat sheet membrane substrate, washing the flat sheet membrane substrate with deionized water, and drying the flat sheet membrane substrate to obtain a PFS-MMOFs modified flat sheet membrane; the removal performance of the polyvinyl alcohol membrane on new pollutants is effectively improved by using a metal organic framework and combining with a chemical method for modification, the modification process is easy to implement, and in addition, the method has important significance on application of the polyvinyl alcohol flat sheet membrane in the field of water treatment and can be applied to the fields of sewage treatment, seawater desalination, new energy and the like.

This invention relates to the field of water treatment technology and discloses a method for preparing electronic-grade ultrapure water. The method involves filtering raw water through a 500-mesh stainless steel screen to remove organic matter, residual chlorine, and odors, followed by softening treatment with ion exchange resin to reduce hardness. The pretreated water is then fed into an MBR reactor, where air bubbles are used to flush the surface of the MBR flat-sheet membrane. The effluent from the MBR biological treatment is then fed into an ultrafiltration permeate tank, where it undergoes a three-stage degassing process, including microbial elimination, removal of residual suspended solids and colloidal particles, and reverse osmosis treatment. After cooling, the water is fed into an intermediate water tank. The effluent from the intermediate water tank is pumped into an EDI water treatment system. After deep purification via EDI, resin debris and microorganisms are removed by filtration. The electronic-grade ultrapure water is then stored in a nitrogen-sealed water tank and returned to the front end of the EDI system via a circulation pipeline. This invention improves desalination rate and impurity removal accuracy, enables automatic replacement of filter materials without shutdown, and ensures continuous production.

The utility model discloses a flat sheet membrane assembly with a plug-in type cluster combination modular structure, which preferably comprises a hollow flat sheet membrane assembly body, an upper connecting piece, a lower connecting piece, a rubber division bar, a groove-shaped plate and an O-shaped sealing ring, a plurality of hollow flat diaphragm assemblies with the same specification are arranged in parallel at intervals along the thickness direction of the hollow flat diaphragm assemblies to form a group, the upper ends of the hollow flat diaphragm assemblies are inserted into holes of the upper connecting piece and are detachably connected in parallel through O-shaped sealing rings, and the lower ends of the hollow flat diaphragm assemblies are embedded into the lower connecting piece through rubber division bars to be detachably connected in parallel; groove-shaped plates are symmetrically embedded in the side faces between the upper connecting piece and the lower connecting piece, and detachable connection is formed, so that a plurality of hollow flat plate membrane assemblies are bundled into an integral combined structure. In a preferred second scheme, except for all the structures in the first scheme, the device further comprises a water collecting box connected to the upper connecting piece. The utility model provides two preferable schemes, so that the installation mode is more flexible, and the adaptability is stronger.

The utility model discloses a multi-piece detachable flat membrane assembly, which belongs to the technical field of environment-friendly sewage treatment equipment and structurally comprises a water collecting cavity, membrane units, inter-piece vertical plates, vertical pressing plates and internal thread nuts or transverse supporting strips, the membrane units are vertically arranged, the number of the membrane units is at least two, and the number of the water collecting cavities is two, and the water collecting cavities are vertically arranged at the left ends and the right ends of the membrane units. Due to the fact that the membrane units and the water collecting cavity are fixedly installed through the screws, the screws can be unscrewed during cleaning, the membrane units can be detached to be cleaned, the membrane units can be cleaned, and the manufacturing cost of the multi-piece detachable combined type flat membrane assembly is greatly reduced compared with that of a vertically-arranged hard plate flat membrane assembly. And compared with a multi-piece integrated soft sheet flat sheet membrane assembly, the membrane can be easily cleaned.