CN211972026U - Ultrapure water preparation system for laboratory - Google Patents
Ultrapure water preparation system for laboratory Download PDFInfo
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- CN211972026U CN211972026U CN201922466040.6U CN201922466040U CN211972026U CN 211972026 U CN211972026 U CN 211972026U CN 201922466040 U CN201922466040 U CN 201922466040U CN 211972026 U CN211972026 U CN 211972026U
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- 239000012498 ultrapure water Substances 0.000 title claims abstract description 24
- 229910021642 ultra pure water Inorganic materials 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 123
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 55
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000012528 membrane Substances 0.000 claims description 14
- 239000002351 wastewater Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 238000005342 ion exchange Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 3
- 238000010612 desalination reaction Methods 0.000 description 3
- 238000011033 desalting Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical group C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 241000700605 Viruses Species 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 150000007523 nucleic acids Chemical class 0.000 description 2
- 102000039446 nucleic acids Human genes 0.000 description 2
- 108020004707 nucleic acids Proteins 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 238000010186 staining Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 210000003855 cell nucleus Anatomy 0.000 description 1
- 230000007646 directional migration Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009296 electrodeionization Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000010076 replication Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
Abstract
The utility model discloses an ultrapure water preparation system is used in laboratory, including pretreatment unit, reverse osmosis system and EDI system, including former water tank, multi-media filter, activated carbon filter, water softener and precision filter in the pretreatment unit, including first-level high-pressure pump, one-level RO reverse osmosis unit, second-level high-pressure pump and second grade RO reverse osmosis unit in the reverse osmosis system, the other end of precision filter is connected with the first-level high-pressure pump, connects gradually between first-level high-pressure pump and one-level RO reverse osmosis unit, first-level pure water case, second-level high-pressure pump and the second grade RO reverse osmosis unit; the EDI system comprises a preposed ultraviolet sterilizer and an EDI module. The utility model discloses can satisfy laboratory one-level water and second grade water requirement, really realize not using consumables such as acid-base, pollution-free environment wastewater discharge. The problem that the water quantity and the water quality of small-sized equipment of the ultrapure water equipment in a laboratory cannot meet the requirement of experimental water and the large-sized equipment cannot realize miniaturization for a long time is solved.
Description
Technical Field
The utility model relates to a water treatment technical field specifically is ultrapure water preparation system is used in laboratory.
Background
The existing ultrapure water equipment in the market mostly adopts a small-sized water purifier and a mixed ion exchange column model form. The water yield is less than or equal to 60 liters/hour generally, and the water yield is small, so that the water demand of a medium-sized laboratory is difficult to meet; the water quality meets the secondary water index of the national laboratory analysis water standard of China (GB/T6682-2008), but the water quality is difficult to stably reach the primary water standard. The device adopts a process combining industrial reverse osmosis equipment and an EDI module. Reverse osmosis is carried out for pre-desalination, the EDI module is an electrodeionization device, the selective migration of ions and the electrical regeneration of resin are realized under the action of a direct current electric field, continuous dynamic desalination and regeneration are realized, high-quality high-purity water is continuously prepared, and the requirement of laboratory on high-standard water consumption is met.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a laboratory is with ultrapure water preparation system has solved the problem that proposes above.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the ultrapure water preparation system for the laboratory comprises a pretreatment unit, a reverse osmosis system and an EDI system, wherein the pretreatment unit comprises a raw water tank, a raw water pump, a multi-media filter, an activated carbon filter, a water softening device and a precision filter, a water outlet of the raw water tank is connected with a water inlet of the raw water pump, and the other end of the raw water pump is connected with the multi-media filter; the other end of the multi-medium filter is connected with an activated carbon filter, and the other end of the activated carbon filter is connected with a water softening device; one end of the water softening device is connected with a precision filter;
the reverse osmosis system comprises a first-stage high-pressure pump, a first-stage RO reverse osmosis device, a second-stage high-pressure pump and a second-stage RO reverse osmosis device, the other end of the precision filter is connected with the first-stage high-pressure pump, and the first-stage high-pressure pump is sequentially connected with the first-stage RO reverse osmosis device, the first-stage pure water tank, the second-stage high-pressure pump and the second-stage RO reverse osmosis device;
including leading ultraviolet sterilizer and EDI module in the EDI system, second grade RO reverse osmosis unit links to each other with leading ultraviolet sterilizer, links to each other in proper order between leading ultraviolet sterilizer and second grade pure water case, EDI feed pump, EDI module, ultrapure water tank, constant voltage feed pump and the rearmounted ultraviolet sterilizer.
Preferably, the multi-media filter is a pressure filter.
Preferably, the multi-media filter, the activated carbon filter and the water softening device all adopt automatic control valves.
Preferably, the primary RO reverse osmosis device and the secondary RO reverse osmosis device are arranged in a secondary mode, and each pressure container is internally provided with 1 membrane element and 2 membrane elements in total.
Preferably, the tail end of the ultrapure water tank is sequentially provided with a secondary water taking point and a primary water taking point.
Advantageous effects
The utility model provides a laboratory is with ultrapure water preparation system. Compared with the prior art, the method has the following beneficial effects:
at present, the pure water preparation field in laboratories at home and abroad mostly adopts the form of RO + ion exchange columns, compared with the similar research technology, the utility model discloses when satisfying the water requirement, really realize not using the target of conventional consumables, no consumables rubbish production, no waste water discharge, non-staining environment. Meanwhile, the small-sized treatment equipment also saves resources, reduces consumption and emission, realizes special purpose for special water, does not waste water quality, and greatly reduces one-time investment cost and operation cost;
the high-efficiency and stable desalting effect of the whole system is realized by combining control devices such as a liquid level controller and the like and a control theory;
the water production cost is low, the one-time investment is low, acid and alkali consumption is avoided in the process, and different water use requirements of small scientific research institutions and laboratories are met.
Drawings
FIG. 1 is a flow chart of the present invention;
in the figure: 1-raw water tank, 2-raw water pump, 3-multi-media filter, 4-activated carbon filter, 5-water softening device, 6-precision filter, 7-first-stage high-pressure pump, 8-first-stage RO reverse osmosis device, 9-first-stage pure water tank, 10-second-stage high-pressure pump, 11-second-stage RO reverse osmosis device, 12-prepositive ultraviolet sterilizer, 13-second-stage pure water tank, 14-EDI water supply pump, 15-EDI module, 16-ultrapure water tank, 17-constant pressure water supply pump, 18-postpositive ultraviolet sterilizer, 19-second-stage water taking point and 20-first-stage water taking point.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the ultrapure water preparation system for the laboratory comprises a pretreatment unit, a reverse osmosis system and an EDI system, wherein the pretreatment unit comprises a raw water tank 1, a raw water pump 2, a multi-media filter 3, an activated carbon filter 4, a water softener 5 and a precision filter 6, a water outlet of the raw water tank 1 is connected with a water inlet of the raw water pump 2, the raw water tank 1 is used as a water storage device, imbalance between water inflow of the system and pumping capacity of the raw water pump 2 is adjusted, the raw water pump 2 is prevented from being started and stopped too frequently, a liquid level is arranged in the raw water tank 1, a raw water inlet valve automatically supplies water according to the liquid level, and the raw water pump 2 is automatically started and stopped according to the liquid level;
the other end of the raw water pump 2 is connected with a multi-media filter 3, the multi-media filter 3 is a pressure type filter, and is the most widely applied equipment in the current water treatment system, mechanical impurities in raw water are intercepted by utilizing gaps among filter materials filled in a container, the inlet water turbidity and the SDI value are reduced, and the normal operation of a reverse osmosis system is ensured;
the other end of the multi-media filter 3 is connected with an activated carbon filter 4, the activated carbon filter 4 further removes the impurities of the residual organic matters and suspended matters in the water discharged from the mechanical filter by using granular activated carbon, so that a good condition is provided for the subsequent reverse osmosis treatment, and the activated carbon filter 4 mainly uses activated carbon organic floccules with high carbon content, large molecular weight and large specific surface area to physically adsorb the impurities in the water, so that the water quality requirement is met, and the running condition of an RO membrane is met; when the activated carbon filter 4 influences normal work due to excessive mechanical impurities intercepted, the activated carbon filter can be cleaned by a back washing method, a sand filter layer in the filter is loosened by utilizing reverse water inflow, and intercepted matters adhered to the surface of a filter material can be stripped and taken away by backflushing water flow, so that the removal of sediments, suspended matters and the like in the filter layer is facilitated, the hardening of the filter material is prevented, and the pollutant interception capability is fully recovered;
the other end of the activated carbon filter 4 is connected with a water softening device 5, the process of removing hardness ions in water is called softening, in order to prevent Ca2+ and Mg2+ from scaling on the surface of the concentrated water side of the reverse osmosis membrane, the water softening device 5 is arranged, an exchanger is cation exchange resin, namely 001 multiplied by 7, after the softening of sodium ions, Ca2+ and Mg2+ in water are replaced by sodium ions, the anion components in water are unchanged, the alkalinity is unchanged, only the original temporary hardness is changed into negative hardness, because the equivalent of sodium is slightly higher than the total amount of mineral salts in calcium and magnesium water, after the exchanger is used for a period of time, the hardness leakage amount of effluent water is gradually increased, when the exchanger reaches a certain value, the exchanger is failed, in order to recover the exchange capacity of the exchanger, the exchanger can be regenerated by using a regenerated liquid, and the commonly used regenerated liquid is NaCl solution;
the multi-media filter 3, the activated carbon filter 4 and the water softener 5 all adopt automatic control valves and can automatically run, back wash, regenerate resin and the like.
One end of the water softening device 5 is connected with a precision filter 6, raw water is subjected to precision filtration after the pretreatment measures, and is treated by the precision filter 6 to further remove residual mechanical impurities in the raw water, so that the water to be treated entering a reverse osmosis system completely meets the water inlet condition of a reverse osmosis membrane, and a filter element of the precision filter 6 adopts a melt-blown PP filter element with the filtering precision of 5 microns;
the reverse osmosis system comprises a primary high-pressure pump 7, a primary RO reverse osmosis device 8, a secondary high-pressure pump 10 and a secondary RO reverse osmosis device 11, the other end of the precision filter 6 is connected with the primary high-pressure pump 7, the primary high-pressure pump 7 is sequentially connected with the primary RO reverse osmosis device 8, the primary pure water tank 9, the secondary high-pressure pump 10 and the secondary RO reverse osmosis device 11, and the primary high-pressure pump 7 and the secondary high-pressure pump 10 are main operation equipment of the reverse osmosis system and provide enough water inlet amount and pressure for the operation of the reverse osmosis device so as to enable the reverse osmosis process to occur and maintain the normal operation of the reverse osmosis process;
the reverse osmosis system adopts a double-stage reverse osmosis membrane group according to the requirements of water yield and water quality, and finally can meet the requirements that the output is 0.125m3/h, the water utilization rate is 50 percent, and the integral desalination rate is more than or equal to 98 percent. The first-stage RO reverse osmosis device 8 and the second-stage RO reverse osmosis device 11 are arranged in a second stage, and each pressure container is internally provided with 1 membrane element and 2 membrane elements in total.
The reverse osmosis system is also provided with low-voltage protection and high-voltage protection: when the pressure of the pressure port of the reverse osmosis high-pressure pump is too low, the reverse osmosis high-pressure pump stops running to protect the reverse osmosis high-pressure pump;
when the high-pressure protection is that the outlet pressure of the reverse osmosis high-pressure pump is too high, the reverse osmosis high-pressure pump stops running so as to protect the reverse osmosis high-pressure pump, a membrane shell, a pipeline, a membrane element and the like;
the EDI system comprises a preposed ultraviolet sterilizer 12 and an EDI module 15, the secondary RO reverse osmosis device 11 is connected with the preposed ultraviolet sterilizer 12, and the preposed ultraviolet sterilizer 12 is sequentially connected with a secondary pure water tank 13, an EDI water supply pump 14, the EDI module 15, an ultra-pure water tank 16, a constant pressure water supply pump 17 and a postposition ultraviolet sterilizer 18;
EDI also known as continuous electric desalting technology, it is a scientific integration of electrodialysis technology and ion exchange technology, through cation, anion membrane to cation, anion selective permeation and ion exchange resin to ion exchange in water, under the effect of power plant to realize ion directional migration, thus achieve its deep purification desalting, and through the water point hydrolysis produced hydrogen ion and hydroxyl ion to fill resin to carry on the continuous regeneration, therefore EDI water process does not need acid, alkali chemical medicine regeneration can be continuously got high-quality ultrapure water, it has advanced technology, compact structure, easy to operate advantages, the quality of effluent water has the best stability.
The preposed ultraviolet sterilizer 12 can ensure that the water entering the EDI membrane stack does not contain microorganisms, remove and kill bacteria in the water, and prevent the EDI from being blocked due to breeding of a large number of microorganisms;
the ultraviolet sterilization band is mainly between 200-300, wherein the sterilization capability is the strongest at the wavelength of 253.7 nm. When various bacterial viruses in water or air pass through an ultraviolet (253.7nm wavelength) irradiation area, ultraviolet penetrates cell membranes and cell nuclei of microorganisms, breaks molecular bonds of nucleic acid (DNA or RNA), and leads the nucleic acid to lose replication capacity or activity and die, thereby killing all the bacterial viruses in the water or the air without using any chemical medicine;
the tail end of the ultra-pure water tank 16 is sequentially provided with a secondary water taking point 19 and a primary water taking point 20.
At present, the pure water preparation field in laboratories at home and abroad mostly adopts the form of RO + ion exchange columns, compared with the similar research technology, the utility model discloses when satisfying the water requirement, really realize not using the target of conventional consumables, no consumables rubbish production, no waste water discharge, non-staining environment. Meanwhile, the small-sized treatment equipment also saves resources, reduces consumption and emission, realizes special purpose for special water, does not waste water quality, and greatly reduces one-time investment cost and operation cost. .
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The ultrapure water preparation system for the laboratory comprises a pretreatment unit, a reverse osmosis system and an EDI system, and is characterized in that the pretreatment unit comprises a raw water tank (1), a raw water pump (2), a multi-media filter (3), an activated carbon filter (4), a water softening device (5) and a precision filter (6), a water outlet of the raw water tank (1) is connected with a water inlet of the raw water pump (2), and the other end of the raw water pump (2) is connected with the multi-media filter (3); the other end of the multi-medium filter (3) is connected with an activated carbon filter (4), and the other end of the activated carbon filter (4) is connected with a water softening device (5); one end of the water softening device (5) is connected with a precision filter (6);
the reverse osmosis system comprises a first-stage high-pressure pump (7), a first-stage RO reverse osmosis device (8), a second-stage high-pressure pump (10) and a second-stage RO reverse osmosis device (11), the other end of the precision filter (6) is connected with the first-stage high-pressure pump (7), and the first-stage high-pressure pump (7) is sequentially connected with the first-stage RO reverse osmosis device (8), the first-stage pure water tank (9), the second-stage high-pressure pump (10) and the second-stage RO reverse osmosis device (11);
including leading ultraviolet sterilizer (12) and EDI module (15) in the EDI system, second grade RO reverse osmosis unit (11) link to each other with leading ultraviolet sterilizer (12), and leading ultraviolet sterilizer (12) and second grade pure water case (13), EDI working shaft (14), EDI module (15), ultrapure water tank (16), constant voltage working shaft (17) and postposition ultraviolet sterilizer (18) link to each other in proper order.
2. The ultrapure water preparation system for laboratories according to claim 1, wherein: the multi-medium filter (3) is a pressure type filter.
3. The ultrapure water preparation system for laboratories according to claim 1, wherein: the multi-media filter (3), the activated carbon filter (4) and the water softener (5) are all provided with automatic control valves.
4. The ultrapure water preparation system for laboratories according to claim 1, wherein: the first-stage RO reverse osmosis device (8) and the second-stage RO reverse osmosis device (11) adopt two-stage arrangement, and each pressure container is internally provided with 1 membrane element and 2 membrane elements in total.
5. The ultrapure water preparation system for laboratories according to claim 1, wherein: the tail end of the ultrapure water tank (16) is sequentially provided with a secondary water taking point (19) and a primary water taking point (20).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922466040.6U CN211972026U (en) | 2019-12-31 | 2019-12-31 | Ultrapure water preparation system for laboratory |
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| CN201922466040.6U CN211972026U (en) | 2019-12-31 | 2019-12-31 | Ultrapure water preparation system for laboratory |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112495186A (en) * | 2020-12-15 | 2021-03-16 | 无锡惠联热电有限公司 | Process for producing two-stage RO concentrated water through ultrafiltration |
| CN114804467A (en) * | 2022-04-26 | 2022-07-29 | 成都优越科技有限公司 | Two-stage reverse osmosis double-pump double-membrane ultrapure water device and ultrapure water preparation process |
-
2019
- 2019-12-31 CN CN201922466040.6U patent/CN211972026U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112495186A (en) * | 2020-12-15 | 2021-03-16 | 无锡惠联热电有限公司 | Process for producing two-stage RO concentrated water through ultrafiltration |
| CN114804467A (en) * | 2022-04-26 | 2022-07-29 | 成都优越科技有限公司 | Two-stage reverse osmosis double-pump double-membrane ultrapure water device and ultrapure water preparation process |
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