CN116495838A - Nuclear pore membrane structure for sewage purification - Google Patents
Nuclear pore membrane structure for sewage purification Download PDFInfo
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- CN116495838A CN116495838A CN202310765684.3A CN202310765684A CN116495838A CN 116495838 A CN116495838 A CN 116495838A CN 202310765684 A CN202310765684 A CN 202310765684A CN 116495838 A CN116495838 A CN 116495838A
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- sewage
- nuclear pore
- membrane
- pore membrane
- membrane structure
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- 239000010865 sewage Substances 0.000 title claims abstract description 78
- 239000012528 membrane Substances 0.000 title claims abstract description 73
- 210000004492 nuclear pore Anatomy 0.000 title claims abstract description 52
- 238000000746 purification Methods 0.000 title claims abstract description 25
- 238000011282 treatment Methods 0.000 claims abstract description 29
- 239000011148 porous material Substances 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 20
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000005530 etching Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- -1 polyethylene terephthalate Polymers 0.000 claims description 2
- 229920001721 polyimide Polymers 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 claims 4
- 239000007788 liquid Substances 0.000 claims 1
- 239000010409 thin film Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 14
- 239000002245 particle Substances 0.000 abstract description 14
- 239000002351 wastewater Substances 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 21
- 239000010802 sludge Substances 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 244000000010 microbial pathogen Species 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 208000003141 Plant Poisoning Diseases 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000003123 plant toxin Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0023—Organic membrane manufacture by inducing porosity into non porous precursor membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/02—Details relating to pores or porosity of the membranes
- B01D2325/0283—Pore size
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/002—Grey water, e.g. from clothes washers, showers or dishwashers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/003—Wastewater from hospitals, laboratories and the like, heavily contaminated by pathogenic microorganisms
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of sewage treatment, and discloses a nuclear pore membrane structure for sewage purification. According to the nuclear pore membrane structure for sewage purification, the nuclear pore membranes with different pore diameters and pore distribution densities are assembled into the membrane assembly step by step according to the pore size from large to small, and the hierarchical filtration purification is realized according to the particle size of pollutants in sewage. The aperture range of the nuclear pore membrane is 10 nm-10 mu m, and the density is 10 5 ~10 9 /cm 2 . Compared with the common filtering membrane, the invention has smaller occupied area, high automation degree and low running cost, and is suitable for purifying various sewage, such as cultivation wastewater, town sewage, biogas slurry and the like.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and relates to a nuclear pore membrane structure for sewage purification.
Background
The town sewage comprises various domestic sewage, industrial wastewater and rainfall runoff mixed water, wherein more than 90% of the town sewage is water, and the rest is solid matters. The solid substances contain pathogenic microorganisms, more suspended substances, heavy metals and the like besides organic matters and inorganic matters. After the water body is polluted by harmful substances, animal and plant poisoning can be caused by drinking water or a food chain, so that various sewage needs to be purified before being discharged to reach the discharge standard.
Because the traditional membrane material treatment process has lower treatment efficiency and limited application scenes, the strict effluent emission requirements and reuse water standards cannot be met. Currently, a nuclear pore membrane treatment technology has been applied to the field of sewage treatment, and a nuclear pore membrane material is formed by etching after an irradiation channel is generated by bombarding an organic polymer plastic film by a heavy ion accelerator. According to different etching time, nuclear pore membrane materials with different pore diameters can be prepared. The nuclear pore membrane is utilized to collect particles to adsorb heavy metal ions and filter pollutants with different particle diameters in water, and the device has the advantages of high purification efficiency and good filtering effect. However, the adoption of nuclear pore membrane systems with different specifications according to the actual condition of sewage can realize the accurate control of sewage purification, which is an unsolved technical problem.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention adopts the following technical scheme:
according to the requirements of the effluent quality and the different particle size distribution of the particles in the wastewater, nuclear pore membrane material combinations with various pore diameters and sizes are selected. Namely, according to the particle size range of the particles in the wastewater, a plurality of nuclear pore membranes with different pore diameters are arranged for gradient filtration, and the sequential filtration and removal of the particles with different particle sizes from large to small are completed.
The selection of the pore distribution density is determined according to the concentration of the particles in the wastewater, namely, the concentration of the particles with a certain particle diameter and the pore distribution density are positively correlated: the greater the concentration, the higher the pore distribution density. According to the adjustment and optimization of the practical application scene, the sewage is accurately filtered.
Based on the technical scheme, the invention provides a nuclear pore membrane structure for sewage purification, which comprises nuclear pore membrane materials with different pore diameters and distribution densities, wherein the nuclear pore membrane materials are assembled step by step according to the pore size from large to small.
Further, the nuclear pore membrane employs at least 2 pore size combinations.
Further, the pore diameter of the nuclear pore membrane ranges from 10nm to 10 mu m, and the distribution density is 10 5 ~10 9 /cm 2 。
Further, the nuclear pore membrane is divided into a flat membrane and a soft film, lining cloth is arranged on two sides of the flat membrane, and a hard membrane structure formed by welding a runner is arranged above the flat membrane. The film is smoother in front and higher in softness than the flat film.
Further, the preparation material of the nuclear pore membrane is an insulating solid film material, and the insulating solid film material comprises: polycarbonates, polyesters, polyimides, polyvinylidene fluorides.
In another aspect, the present invention provides a method for preparing a nuclear pore membrane structure for sewage purification, comprising: selecting polyethylene terephthalate (PET) film materials with thickness of 12 mu m and 25 mu m, preparing a nuclear pore film by using an irradiation technology, and performing ultrasonic cleaning with deionized water for 5-10 min and airing after etching the film surface by etching solution to form different apertures.
Compared with the prior art, the nuclear pore membrane structure for sewage purification has the following beneficial effects:
the nuclear pore membrane structure for purifying sewage provided by the invention can be used for assembling the nuclear pore membrane purifying device with corresponding specification according to different particle sizes of filtered matters in the sewage, so as to realize the graded filtration of sewage particles, pathogenic microorganisms, organic pollutants and the like.
The nuclear pore membrane structure for sewage purification provided by the invention has the advantages that the pore size and the pore distribution density of the nuclear pore membrane can be accurately controlled, the water yield, the water outlet stability and the anti-fouling performance are excellent, and the water quality of the outlet water reaches the standard and is discharged.
The nuclear pore membrane structure for purifying sewage provided by the invention can be applied to multiple scenes and is suitable for purifying laboratory or hospital sewage, domestic sewage, culture wastewater or biogas slurry, town sewage and the like.
The nuclear pore membrane structure for sewage purification provided by the invention can be directly taken out for insertion replacement when the nuclear pore membrane structure is damaged, is convenient to operate and saves the running cost of equipment.
Detailed Description
The following describes the technical aspects of the present invention with reference to examples, but the present invention is not limited to the following examples.
Example 1
The embodiment provides the filtering effect of the flat membrane material on town sewage.
Sewage to be filtered: yang Lingou Rou Gu Zhen town sewage sample 1 of Shaanxi province
Filtration material: flat plate film PET film material
Water quality of inlet water: see Table 1
TABLE 1 quality of incoming water (i.e., quality of water before treatment)
The experimental method comprises the following steps:
the town sewage treatment method adopts the nuclear pore membrane sewage purification device and the circulating activated sludge method provided by the invention respectively. And (3) placing the nuclear pore membrane components with the pore diameters of 10 mu m, 1 mu m, 100nm and 10nm in sequence into a sewage treatment tank for filtering and purifying. The ventilation rate is 6-8L/min/m 3 The water inflow flux is 20L/h/m 3 Until the flux is minimal, the holes are completely plugged. The operation mode is continued for 24 hours after 8 hours and 2 hours of stopping, and then the blocked membrane module is subjected to water back flushing treatment, so that the membrane module system operates for 3-4 days without pressure filtration; and alkaline sewage and acid sewage existing in town sewage are cleaned by maintainability chemistry. Demulsification aiming at mixing alkaline sewage into oil waterAnd (3) separating oil from water by using a demulsification technology, adding hydroxide and calcium fluoride into the acidic sewage, separating out metal ions by adopting a hydroxide precipitation method, precipitating fluoride by adopting a calcium fluoride precipitation method, thoroughly treating the sewage, and discharging the effluent after the pollution degree is reduced to the minimum.
The circulating activated sludge rule is carried out by adopting a conventional sewage treatment process. And (3) respectively detecting the inlet water sample (table 1) and the outlet water sample (table 2) treated by the nuclear pore membrane sewage purification device treatment method and the circulating activated sludge method, and evaluating the sewage treatment capacity of the flat membrane system.
Experimental results: see Table 2
Table 2, the effluent quality (i.e., the quality of treated water)
Table 2 shows the results of water quality tests after two treatments. As shown in the table, after the town sewage is treated by the circulating activated sludge method, the COD content is 23.44mg/L, the ammonia nitrogen content is 5.73mg/L, the total ammonia content is 26.86mg/L, and the total phosphorus content is 2.75mg/L. After the sewage is treated by the method provided by the invention, the sewage filtering and purifying capacity is obvious, the COD content is reduced to 11.52mg/L from 310.7mg/L, the ammonia nitrogen content is reduced to 0.77mg/L from 55.3mg/L, the total ammonia content is reduced to 14.62mg/L from 40.62mg/L, and the total phosphorus content is reduced to 0.28mg/L from 4.58mg/L, wherein the ammonia nitrogen total amount reducing effect is extremely remarkable, and the treatment rate is 71.81 times.
From the data presented in table 2, it is found that compared with the treatment of town sewage by the circulating activated sludge method, the flat membrane system has stronger sewage treatment capacity and better effect.
Example 2
The embodiment provides the filtering effect of the film material on town sewage.
Sewage to be filtered: yang Lingou Rou Gu Zhen town sewage sample 2 of Shaanxi province
Filtration material: PET film material
Water quality of inlet water: see Table 3
TABLE 3 quality of incoming water (i.e., quality of water before treatment)
The experimental method comprises the following steps:
the town sewage treatment method adopts the nuclear pore membrane sewage purification device and the circulating activated sludge method provided by the invention respectively. And (3) putting the film membrane components with the inner hole diameters of 15 mu m and 3 mu m in sequence into a town sewage treatment tank for filtering and purifying. The sewage enters a film membrane pool, and the ventilation rate is 6-8L/min/m under the condition of high sludge concentration 3 The water inflow flux is 20L/h/m 3 After the operation mode is started for 24 hours for every 8 hours and stopped for 2 hours, water backwashing is carried out to treat the blocked membrane sample, and the soft membrane with the inner hole aperture of 15 mu m is subjected to pressureless filtration for 3-4 d; the film membrane with the inner hole aperture of 3 mu m is operated for 9-10 days without pressure filtration; the pressure of the film system with the thickness of 3 mu m is increased to 0.03 after 41d of operation, the machine is stopped, and the total water passing amount is 90m 3 And alkaline sewage and acid sewage existing in town sewage are cleaned by maintainability chemistry. Aiming at the alkaline sewage mixed with demulsifier in the oil-water, the demulsification technology is utilized to separate the oil-water, the acid sewage is added with hydroxide and calcium fluoride, the hydroxide precipitation method is adopted to separate out metal ions, the calcium fluoride precipitation method is adopted to precipitate fluoride, the sewage is thoroughly treated, and the effluent is discharged after the pollution degree is reduced to the minimum.
The circulating activated sludge rule is carried out by adopting a conventional sewage treatment process. And (3) respectively detecting the inlet water sample (table 3) and the outlet water sample (table 4) treated by the nuclear pore membrane sewage purification device treatment method and the circulating activated sludge method, and evaluating the sewage treatment capacity of the film membrane system.
Experimental results: see Table 4
Table 4, the effluent quality (i.e., the treated water quality)
Table 4 shows the results of water quality tests after the two treatments. The advanced treatment of the film achieves the effect of separating mud from water and removes suspended matters in water. As shown in Table 4, after the town sewage is treated by the circulating activated sludge method, the COD content is 18.32mg/L, the ammonia nitrogen content is 1.46mg/L, the total ammonia content is 17.64mg/L, and the total phosphorus content is 2.05mg/L. After the nuclear pore membrane component is used for treatment, the sewage is obviously purified after the membrane is treated by the nuclear pore membrane component, the COD content is reduced from 529.9mg/L to 10.27mg/L, the ammonia nitrogen content is reduced from 64.35mg/L to 0.333mg/L, the total ammonia content is reduced from 66.55mg/L to 10.58mg/L, and the total phosphorus content is reduced from 3.95mg/L to 0.135mg/L, wherein the ammonia nitrogen total amount reduction effect is extremely obvious, and the treatment rate is 193.24 times. The COD content after 15 mu m membrane treatment is 14.37mg/L, the ammonia nitrogen content is 0.602mg/L, the total ammonia content is 12.42mg/L, the total phosphorus content is 0.16mg/L, and compared with the circulating activated sludge process sewage purification capability, the two pore-size membrane materials have stronger purification capability, and the water quality of the effluent reaches the A-level standard of the yellow river basin sewage comprehensive discharge standard.
The embodiments described above are only some, but not all, embodiments of the invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments obtained without inventive effort by a person skilled in the art, which are related deductions and substitutions made by the person skilled in the art under the condition of the inventive concept, are within the scope of protection of the present invention.
Claims (7)
1. The nuclear pore membrane structure for purifying sewage is characterized by comprising nuclear pore membranes with different pore diameters and distribution densities, wherein the nuclear pore membranes are assembled step by step according to the pore size from large to small.
2. The nuclear pore membrane structure for sewage purification according to claim 1, wherein the nuclear pore membrane is used in combination of at least 2 pore diameters.
3. The nuclear pore membrane structure for sewage purification according to claim 1, wherein the pore diameter of the nuclear pore membrane ranges from 10nm to 10 μm, and the distribution density is 10 5 ~10 9 /cm 2 。
4. The nuclear pore membrane structure for sewage purification according to claim 1, wherein the nuclear pore membrane is divided into a flat membrane and a film membrane.
5. The nuclear pore membrane structure for sewage purification according to claim 1, wherein the preparation material of the nuclear pore membrane is an insulating solid thin film material comprising: polycarbonates, polyesters, polyimides, polyvinylidene fluorides.
6. The preparation method of the nuclear pore membrane structure for purifying sewage is characterized by comprising the following steps: selecting polyethylene terephthalate film materials with thickness of 12 mu m and 25 mu m, preparing a nuclear pore film by using an irradiation technology, and performing ultrasonic cleaning with deionized water for 5-10 min and airing after etching the film surface by etching solution to form different apertures.
7. The use of the nuclear pore membrane structure for sewage purification according to any one of claims 1 to 5 in sewage or waste liquid purification treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310765684.3A CN116495838A (en) | 2023-06-27 | 2023-06-27 | Nuclear pore membrane structure for sewage purification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310765684.3A CN116495838A (en) | 2023-06-27 | 2023-06-27 | Nuclear pore membrane structure for sewage purification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116495838A true CN116495838A (en) | 2023-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310765684.3A Pending CN116495838A (en) | 2023-06-27 | 2023-06-27 | Nuclear pore membrane structure for sewage purification |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2863046Y (en) * | 2006-01-13 | 2007-01-31 | 长春吉原生物科技有限公司 | Nuclear track-etched membrane composite wound dressing |
| CN101766959A (en) * | 2009-12-22 | 2010-07-07 | 武汉智迅创源科技发展有限公司 | Small-bore nuclear pore filter membrane and production method thereof |
| CN217516736U (en) * | 2022-05-27 | 2022-09-30 | 广东科清环境技术有限公司 | Complete EHBR process sewage treatment plant |
| CN115475529A (en) * | 2021-05-31 | 2022-12-16 | 青岛海尔智能技术研发有限公司 | Filter element assembly and water purifier |
-
2023
- 2023-06-27 CN CN202310765684.3A patent/CN116495838A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2863046Y (en) * | 2006-01-13 | 2007-01-31 | 长春吉原生物科技有限公司 | Nuclear track-etched membrane composite wound dressing |
| CN101766959A (en) * | 2009-12-22 | 2010-07-07 | 武汉智迅创源科技发展有限公司 | Small-bore nuclear pore filter membrane and production method thereof |
| CN115475529A (en) * | 2021-05-31 | 2022-12-16 | 青岛海尔智能技术研发有限公司 | Filter element assembly and water purifier |
| CN217516736U (en) * | 2022-05-27 | 2022-09-30 | 广东科清环境技术有限公司 | Complete EHBR process sewage treatment plant |
Non-Patent Citations (1)
| Title |
|---|
| 俞文和主编: "《电力环保及应化专业毕业设计指南》", 中国石油大学出版社, pages: 248 - 249 * |
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