CN114307661B - Rapid cleaning method for organic matters on surface of ultrafiltration membrane - Google Patents
Rapid cleaning method for organic matters on surface of ultrafiltration membrane Download PDFInfo
- Publication number
- CN114307661B CN114307661B CN202210030314.0A CN202210030314A CN114307661B CN 114307661 B CN114307661 B CN 114307661B CN 202210030314 A CN202210030314 A CN 202210030314A CN 114307661 B CN114307661 B CN 114307661B
- Authority
- CN
- China
- Prior art keywords
- cleaning
- ultrafiltration membrane
- solution
- cleaning solution
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Detergent Compositions (AREA)
Abstract
The invention relates to the technical field of ultrafiltration membrane cleaning, and discloses a method for quickly cleaning organic matters on the surface of an ultrafiltration membrane, wherein the traditional cleaning method mostly adopts the same cleaning solution for cleaning, the effect is not obvious enough, and bacteria and germs attached to the ultrafiltration membrane are difficult to eliminate, so that the actual use requirement cannot be met, and S1 is used for preparing an acid cleaning solution for later use; and S2, preparing an alkaline cleaning solution for later use. According to the cleaning method, through double cleaning of the acidic cleaning solution and the alkaline cleaning solution, the alkaline cleaning solution can be used for effectively and fully decomposing attached organic matters, the cleaning effect on the organic matters on the surface of the ultrafiltration membrane can be improved after subsequent cleaning, bacteria and germs attached to the ultrafiltration membrane can be eliminated by adopting a mode of firstly cleaning and then soaking, so that the actual use requirement can be met, the method is relatively quick in cleaning, the service life of the ultrafiltration membrane can be greatly prolonged, and the method has a certain market popularization prospect.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membrane cleaning, in particular to a method for quickly cleaning organic matters on the surface of an ultrafiltration membrane.
Background
The ultrafiltration membrane is a microporous filtration membrane with the pore size specification being consistent and the rated pore size range being less than 0.01 micron, solute molecules smaller than the pore size can be screened out by applying proper pressure to one side of the membrane so as to separate particles with the molecular weight being more than 500 daltons (atomic mass unit) and the particle size being more than 10 nanometers, the ultrafiltration membrane is one of the earliest developed high-molecular separation membranes, and industrialization is realized in an ultrafiltration device in 60 years.
Aiming at organic matters on the ultrafiltration membrane, most of the traditional cleaning methods adopt the same cleaning solution for cleaning, the effect is not obvious enough, and bacteria and germs attached to the ultrafiltration membrane are difficult to eliminate, so that the practical use requirement cannot be met. Therefore, the skilled person provides a method for rapidly cleaning the organic matter on the surface of the ultrafiltration membrane to solve the problems mentioned in the background art.
Disclosure of Invention
The invention aims to provide a method for quickly cleaning organic matters on the surface of an ultrafiltration membrane, which can be used for effectively and fully decomposing attached organic matters by using an acidic cleaning solution and an alkaline cleaning solution through double cleaning of the acidic cleaning solution and the alkaline cleaning solution, can improve the cleaning effect on the organic matters on the surface of the ultrafiltration membrane after subsequent washing, can kill bacteria and germs attached to the ultrafiltration membrane by adopting a mode of washing and soaking in advance, can meet the actual use requirement, is relatively quick to clean, can greatly prolong the service life of the ultrafiltration membrane, and has certain market popularization prospect.
In order to achieve the purpose, the invention provides the following technical scheme:
the method for quickly cleaning the organic matters on the surface of the ultrafiltration membrane comprises the following steps:
s1, preparing an acidic cleaning solution for later use, wherein the acidic cleaning solution mainly comprises a preservative, an acidic regulator, white atractylodes rhizome essential oil, cyclohexane, isopropanol and deionized water, the pH value of the acidic cleaning solution is controlled to be 2.5, and the acidic cleaning solution comprises the following components in parts by weight: 1-3 parts of preservative, 1.5-4.5 parts of acidity regulator, 1.2-1.6 parts of white atractylodes rhizome essential oil, 0.8-1.8 parts of cyclohexane, 62-68 parts of isopropanol and 32-38 parts of deionized water;
s2, preparing an alkaline cleaning solution for later use, wherein the alkaline cleaning solution mainly comprises sodium silicate, sodium gluconate, sodium hydroxide and deionized water, the pH value of the alkaline cleaning solution is controlled to be 11, and the alkaline cleaning solution comprises the following components in parts by weight: 3-4.5 parts of sodium silicate, 2.5-4.5 parts of sodium gluconate, 8-14 parts of sodium hydroxide and 25-35 parts of deionized water;
s3, heating the prepared acidic cleaning solution to 40 ℃, injecting the acidic cleaning solution into a spray gun, horizontally placing the ultrafiltration membrane, horizontally spraying the acidic cleaning solution through the spray gun above the ultrafiltration membrane for circular cleaning until the temperature of the acidic cleaning solution is reduced to 30-35 ℃, stopping circular cleaning, and soaking the ultrafiltration membrane subjected to primary cleaning in a disinfectant for 10-20 min;
s4, after soaking, using distilled water to clean residual acid cleaning solution and disinfection solution on the surface and inside of the ultrafiltration membrane, and stopping washing when the pH value of the liquid is consistent with that of the distilled water;
s5, heating the prepared alkaline cleaning solution to 35-42 ℃, injecting the alkaline cleaning solution into a spray gun, horizontally placing the ultrafiltration membrane, horizontally spraying the alkaline cleaning solution through the spray gun above to perform circular cleaning until the temperature of the alkaline cleaning solution is reduced to 28-33 ℃, stopping circular cleaning, and then soaking the ultrafiltration membrane subjected to secondary cleaning in a disinfectant for 15-25 min;
and S6, after secondary soaking, washing the surface of the ultrafiltration membrane and residual alkaline cleaning solution and disinfection solution inside the ultrafiltration membrane by using distilled water, and stopping washing when the pH value of the washing liquid is consistent with that of the distilled water.
As a still further scheme of the invention: the conductivity of the alkaline cleaning solution is 155-175mS/cm, and the conductivity of the acidic cleaning solution is 165-170 mS/cm.
As a still further scheme of the invention: and in the step S3, the pH value of the acidic cleaning solution is controlled to be 1.5-2.5 in the acid washing process, and the pH value of the alkaline cleaning solution is controlled to be 10-12 in the alkaline cleaning process in the step S5.
As a still further scheme of the invention: the flow rate of the acid cleaning liquid in the spray gun in the S3 is 1.5m 3 /h-3.5m 3 The water pressure is 0.08-0.09MPa, wherein the acid cleaning process is front and back cleaning, and the steps of the front cleaning and the back cleaning are consistent.
As a still further scheme of the invention: the flow rate of the alkaline cleaning liquid in the spray gun in the S5 is 1.6m 3 /h-3.2m 3 The water pressure is 0.06-0.07MPa, wherein the alkaline cleaning process specifically comprises front and back cleaning and internal cleaning, and the steps of the front cleaning and the back cleaning are consistent.
As a still further scheme of the invention: the acid cleaning time is 5.5-7.5h, the alkaline cleaning time is 4.5-5.5h, and the acid cleaning solution and the alkaline cleaning solution after cleaning are collected in the acid cleaning and alkaline cleaning processes.
As a still further scheme of the invention: the disinfectant is prepared from the following raw materials, by weight, 5-15 parts of ethanol, 0.15-0.19 part of citric acid, 0.35-0.45 part of polylysine salt, 62-68 parts of water, 0.2-0.4 part of potassium permanganate and 1.2-1.8 parts of boron nitride, and the specific preparation method is as follows: and pouring ethanol, polylysine salt and potassium permanganate into the reaction bottle a, uniformly mixing to form a first mixed solution, then pouring citric acid, boron nitride and water into the reaction bottle b, uniformly mixing to form a second mixed solution, uniformly stirring the first mixed solution and the second mixed solution at the temperature of 45-55 ℃, and then cooling to room temperature to obtain the finished disinfectant.
As a still further scheme of the invention: and before the mixed liquid I and the mixed liquid II are stirred, filtering precipitates of the mixed liquid I and the mixed liquid II to remove a small amount of impurities in the mixed liquid I and the mixed liquid II.
Compared with the prior art, the invention has the beneficial effects that: according to the cleaning method, through double cleaning of the acidic cleaning solution and the alkaline cleaning solution, the alkaline cleaning solution can be used for effectively and fully decomposing attached organic matters, the cleaning effect on the organic matters on the surface of the ultrafiltration membrane can be improved after subsequent cleaning, bacteria and germs attached to the ultrafiltration membrane can be eliminated by adopting a mode of firstly cleaning and then soaking, so that the actual use requirement can be met, the method is relatively quick in cleaning, the service life of the ultrafiltration membrane can be greatly prolonged, and the method has a certain market popularization prospect.
Detailed Description
Example 1
The method for quickly cleaning the organic matters on the surface of the ultrafiltration membrane comprises the following steps:
s1, preparing an acidic cleaning solution for later use, wherein the acidic cleaning solution mainly comprises a preservative, an acidic regulator, white atractylodes rhizome essential oil, cyclohexane, isopropanol and deionized water, the pH value of the acidic cleaning solution is controlled to be 2.5, and the acidic cleaning solution comprises the following components in parts by weight: 2 parts of preservative, 3 parts of acidity regulator, 1.5 parts of white atractylodes rhizome essential oil, 1.5 parts of cyclohexane, 64 parts of isopropanol and 35 parts of deionized water;
s2, preparing an alkaline cleaning solution for later use, wherein the alkaline cleaning solution mainly comprises sodium silicate, sodium gluconate, sodium hydroxide and deionized water, the pH value of the alkaline cleaning solution is controlled to be 11, and the alkaline cleaning solution comprises the following components in parts by weight: 4 parts of sodium silicate, 3 parts of sodium gluconate, 10 parts of sodium hydroxide and 30 parts of deionized water;
s3, heating the prepared acidic cleaning solution to 40 ℃, injecting the acidic cleaning solution into a spray gun, horizontally placing the ultrafiltration membrane, horizontally spraying the acidic cleaning solution through the spray gun above the ultrafiltration membrane for circular cleaning until the temperature of the acidic cleaning solution is reduced to 32 ℃, stopping circular cleaning, and soaking the ultrafiltration membrane subjected to primary cleaning in a disinfectant for 15 min;
s4, after soaking, using distilled water to clean residual acid cleaning solution and disinfection solution on the surface and inside of the ultrafiltration membrane, and stopping washing when the pH value of the liquid is consistent with that of the distilled water;
s5, heating the prepared alkaline cleaning solution to 40 ℃, injecting the alkaline cleaning solution into a spray gun, horizontally placing the ultrafiltration membrane, horizontally spraying the alkaline cleaning solution through the spray gun above to perform circular cleaning until the temperature of the alkaline cleaning solution is reduced to 30 ℃, stopping circular cleaning, and then soaking the ultrafiltration membrane subjected to secondary cleaning in a disinfectant for 20 min;
and S6, after secondary soaking, washing the surface of the ultrafiltration membrane and residual alkaline cleaning solution and disinfection solution inside the ultrafiltration membrane by using distilled water, and stopping washing when the pH value of the washing liquid is consistent with that of the distilled water.
Preferably: the conductivity of the alkaline cleaning solution is 160mS/cm, and the conductivity of the acidic cleaning solution is 168 mS/cm.
Preferably: in the step S3, the pH of the acidic cleaning solution is controlled to 2 in the pickling process, and in the step S5, the pH of the alkaline cleaning solution is controlled to 11 in the alkaline cleaning process.
Preferably: the flow rate of the acid cleaning solution in the spray gun in S3 is 2m 3 And h, the water pressure is 0.085MPa, wherein the acid cleaning process is front and back cleaning, and the steps of the front cleaning and the back cleaning are consistent.
Preferably: the flow rate of the alkaline cleaning solution in the spray gun in S5 is 3m 3 The water pressure is 0.065MPa, wherein the alkaline cleaning process specifically comprises front and back cleaning and internal cleaning, and the steps of the front cleaning and the back cleaning are consistent.
Preferably: the acid cleaning time is 6 hours, the alkaline cleaning time is 5 hours, and in the acid cleaning process and the alkaline cleaning process, the acid cleaning solution and the alkaline cleaning solution after cleaning are collected.
Preferably: the disinfectant is prepared from the following raw materials in parts by weight, 10 parts of ethanol, 0.17 part of citric acid, 0.4 part of polylysine salt, 65 parts of water, 0.3 part of potassium permanganate and 1.5 parts of boron nitride, and the specific preparation method is as follows: and pouring ethanol, polylysine salt and potassium permanganate into the reaction bottle a, uniformly mixing to form a first mixed solution, then pouring citric acid, boron nitride and water into the reaction bottle b, uniformly mixing to form a second mixed solution, uniformly stirring the first mixed solution and the second mixed solution at the temperature of 50 ℃, and then cooling to room temperature to obtain the finished disinfectant.
Preferably: before the mixed liquid I and the mixed liquid II are stirred, sediment filtration is carried out on the mixed liquid I and the mixed liquid II, and a small amount of impurities in the mixed liquid I and the mixed liquid II are removed.
According to the cleaning method, through double cleaning of the acidic cleaning solution and the alkaline cleaning solution, the alkaline cleaning solution can be used for effectively and fully decomposing attached organic matters, the cleaning effect on the organic matters on the surface of the ultrafiltration membrane can be improved after subsequent cleaning, bacteria and germs attached to the ultrafiltration membrane can be eliminated by adopting a mode of firstly cleaning and then soaking, so that the actual use requirement can be met, the method is relatively quick in cleaning, the service life of the ultrafiltration membrane can be greatly prolonged, and the method has a certain market popularization prospect.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (6)
1. The method for quickly cleaning the organic matters on the surface of the ultrafiltration membrane is characterized by comprising the following steps of:
s1, preparing an acidic cleaning solution for later use, wherein the acidic cleaning solution mainly comprises a preservative, an acidic regulator, white atractylodes rhizome essential oil, cyclohexane, isopropanol and deionized water, the pH value of the acidic cleaning solution is controlled to be 1.5-2.5, and the acidic cleaning solution comprises the following components in parts by weight: 1-3 parts of preservative, 1.5-4.5 parts of acidity regulator, 1.2-1.6 parts of white atractylodes rhizome essential oil, 0.8-1.8 parts of cyclohexane, 62-68 parts of isopropanol and 32-38 parts of deionized water;
s2, preparing an alkaline cleaning solution for later use, wherein the alkaline cleaning solution mainly comprises sodium silicate, sodium gluconate, sodium hydroxide and deionized water, the pH value of the alkaline cleaning solution is controlled to be 10-12, and the alkaline cleaning solution comprises the following components in parts by weight: 3-4.5 parts of sodium silicate, 2.5-4.5 parts of sodium gluconate, 8-14 parts of sodium hydroxide and 25-35 parts of deionized water;
s3, heating the prepared acidic cleaning solution to 40 ℃, injecting the acidic cleaning solution into a spray gun, horizontally placing the ultrafiltration membrane, horizontally spraying the acidic cleaning solution through the spray gun above the ultrafiltration membrane for circular cleaning until the temperature of the acidic cleaning solution is reduced to 30-35 ℃, stopping circular cleaning, and soaking the ultrafiltration membrane subjected to primary cleaning in a disinfectant for 10-20 min;
s4, after soaking, using distilled water to clean residual acid cleaning solution and disinfection solution on the surface and inside of the ultrafiltration membrane, and stopping washing when the pH value of the liquid is consistent with that of the distilled water;
s5, heating the prepared alkaline cleaning solution to 35-42 ℃, injecting the alkaline cleaning solution into a spray gun, horizontally placing the ultrafiltration membrane, horizontally spraying the alkaline cleaning solution through the spray gun above the ultrafiltration membrane for circular cleaning until the temperature of the alkaline cleaning solution is reduced to 28-33 ℃, stopping circular cleaning, and soaking the ultrafiltration membrane subjected to secondary cleaning in a disinfectant for 15-25 min;
s6, after secondary soaking, washing the surface of the ultrafiltration membrane and residual alkaline cleaning solution and disinfection solution inside the ultrafiltration membrane with distilled water, and stopping washing when the pH value of the liquid is consistent with that of the distilled water;
the disinfectant is prepared from the following raw materials, by weight, 5-15 parts of ethanol, 0.15-0.19 part of citric acid, 0.35-0.45 part of polylysine salt, 62-68 parts of water, 0.2-0.4 part of potassium permanganate and 1.2-1.8 parts of boron nitride, and the specific preparation method is as follows: and pouring ethanol, polylysine salt and potassium permanganate into the reaction bottle a, uniformly mixing to form a first mixed solution, then pouring citric acid, boron nitride and water into the reaction bottle b, uniformly mixing to form a second mixed solution, uniformly stirring the first mixed solution and the second mixed solution at the temperature of 45-55 ℃, and then cooling to room temperature to obtain the finished disinfectant.
2. The method for rapidly cleaning the organic matter on the surface of the ultrafiltration membrane according to claim 1, wherein the conductivity of the alkaline cleaning solution is 155-175mS/cm, and the conductivity of the acidic cleaning solution is 165-170 mS/cm.
3. The method for rapidly cleaning the organic matter on the surface of the ultrafiltration membrane according to claim 1, wherein the flow rate of the acid cleaning liquid in the spray gun in the S3 is 1.5m 3 /h-3.5m 3 The water pressure is 0.08-0.09MPa, wherein the acid cleaning process is front and back cleaning, and the steps of the front cleaning and the back cleaning are consistent.
4. The method for rapidly cleaning the organic matter on the surface of the ultrafiltration membrane according to claim 1, wherein the flow rate of the alkaline cleaning liquid in the spray gun in the S5 is 1.6m 3 /h-3.2m 3 The water pressure is 0.06-0.07MPa, wherein the alkaline cleaning process specifically comprises front and back cleaning and internal cleaning, and the steps of the front cleaning and the back cleaning are consistent.
5. The method for rapidly cleaning the organic matter on the surface of the ultrafiltration membrane according to claim 1, wherein the acid cleaning time is 5.5-7.5 hours, the alkaline cleaning time is 4.5-5.5 hours, and the acid cleaning solution and the alkaline cleaning solution after cleaning are collected in the acid cleaning process and the alkaline cleaning process.
6. The method for rapidly cleaning the organic matter on the surface of the ultrafiltration membrane according to claim 1, wherein before the first mixed solution and the second mixed solution are stirred, precipitates of the first mixed solution and the second mixed solution are filtered to remove a small amount of impurities in the first mixed solution and the second mixed solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210030314.0A CN114307661B (en) | 2022-01-12 | 2022-01-12 | Rapid cleaning method for organic matters on surface of ultrafiltration membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210030314.0A CN114307661B (en) | 2022-01-12 | 2022-01-12 | Rapid cleaning method for organic matters on surface of ultrafiltration membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114307661A CN114307661A (en) | 2022-04-12 |
| CN114307661B true CN114307661B (en) | 2022-09-20 |
Family
ID=81026939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210030314.0A Active CN114307661B (en) | 2022-01-12 | 2022-01-12 | Rapid cleaning method for organic matters on surface of ultrafiltration membrane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114307661B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05103958A (en) * | 1991-10-21 | 1993-04-27 | Ataka Kogyo Kk | Cleaning method of membrane module |
| JP2011115712A (en) * | 2009-12-02 | 2011-06-16 | Mitsubishi Heavy Ind Ltd | Washing method of filter membrane |
| CN107297147A (en) * | 2017-07-19 | 2017-10-27 | 湖南军信环保股份有限公司 | The cleaning method of milipore filter |
| CN107398185A (en) * | 2017-07-19 | 2017-11-28 | 湖南军信环保股份有限公司 | A kind of chemical cleaning method of milipore filter |
| CN110605027A (en) * | 2018-06-14 | 2019-12-24 | 中国石油化工股份有限公司 | Alkaline cleaning solution, acidic cleaning solution and ultrafiltration membrane cleaning method |
| CN112473383A (en) * | 2020-12-28 | 2021-03-12 | 湖南欧威爱特新材料科技有限公司 | Method for cleaning organic matters on ultrafiltration membrane |
| CN112473390A (en) * | 2020-12-18 | 2021-03-12 | 攀钢集团重庆钛业有限公司 | Ultrafiltration membrane cleaning agent and cleaning method thereof |
-
2022
- 2022-01-12 CN CN202210030314.0A patent/CN114307661B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05103958A (en) * | 1991-10-21 | 1993-04-27 | Ataka Kogyo Kk | Cleaning method of membrane module |
| JP2011115712A (en) * | 2009-12-02 | 2011-06-16 | Mitsubishi Heavy Ind Ltd | Washing method of filter membrane |
| CN107297147A (en) * | 2017-07-19 | 2017-10-27 | 湖南军信环保股份有限公司 | The cleaning method of milipore filter |
| CN107398185A (en) * | 2017-07-19 | 2017-11-28 | 湖南军信环保股份有限公司 | A kind of chemical cleaning method of milipore filter |
| CN110605027A (en) * | 2018-06-14 | 2019-12-24 | 中国石油化工股份有限公司 | Alkaline cleaning solution, acidic cleaning solution and ultrafiltration membrane cleaning method |
| CN112473390A (en) * | 2020-12-18 | 2021-03-12 | 攀钢集团重庆钛业有限公司 | Ultrafiltration membrane cleaning agent and cleaning method thereof |
| CN112473383A (en) * | 2020-12-28 | 2021-03-12 | 湖南欧威爱特新材料科技有限公司 | Method for cleaning organic matters on ultrafiltration membrane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114307661A (en) | 2022-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105056768B (en) | A kind of compound forward osmosis membrane supporting layer of houghite and preparation method thereof | |
| CN107433185B (en) | Air purification material and preparation method thereof | |
| CN104176796A (en) | Dephosphorizing flocculating agent and preparation and application thereof | |
| CN114307661B (en) | Rapid cleaning method for organic matters on surface of ultrafiltration membrane | |
| CN204958614U (en) | Directly drink water purification installation | |
| CN102276759A (en) | Preparation technology of agar for high-quality microbial culture medium | |
| CN107376667B (en) | Method and device for preparing nano-filtration/forward-osmosis amphibious-performance CTA (CTA) membrane | |
| CN108083450B (en) | Complexing agent for rare earth wastewater | |
| CN103525952A (en) | Method for removing 2-aminoacetophenone in high fructose corn syrup | |
| CN204265572U (en) | A kind of hotel's softening water and direct drinking water treatment system | |
| CN203507825U (en) | New recovery system for recovering acid and alkali from viscose sodium sulfate waste liquid by bipolar membrane electrodialysis method | |
| CN111039381A (en) | Method for improving quality of reverse osmosis seawater desalination produced water | |
| CN209537177U (en) | A kind of processing system preparing boiler feedwater | |
| CN201506786U (en) | High-voltage electric field wine processing device | |
| CN103386254B (en) | Cleaning method for bipolar-membrane electrodialysis membrane group device for preparing acid/base from sodium sulfate waste liquid | |
| CN106040001B (en) | A kind of methionine salt saponification liquor decarburization acid salt technique | |
| CN102847507A (en) | Composite absorption material for removing sulfates in water, and preparation method thereof | |
| CN206051739U (en) | Reverse osmose pure-water equipment | |
| CN112568303A (en) | Instant tea preparation process based on microfiltration-reverse osmosis technology | |
| CN203393286U (en) | System for recovering acid and alkali from viscose sodium sulfate waste liquor by bipolar membrane electrodialysis method | |
| CN202107584U (en) | Water-saving device for electroplating production line | |
| CN205204963U (en) | Miniature seawater desalination machine | |
| CN212864218U (en) | Chemical water-making mixed bed system | |
| CN201648152U (en) | Intelligent reverse osmosis mineralization and purification drinking fountain | |
| CN221720660U (en) | Ultrapure water treatment system in polycrystalline silicon industry |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |