CN110523288A - A kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent - Google Patents
A kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent Download PDFInfo
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- CN110523288A CN110523288A CN201910832293.2A CN201910832293A CN110523288A CN 110523288 A CN110523288 A CN 110523288A CN 201910832293 A CN201910832293 A CN 201910832293A CN 110523288 A CN110523288 A CN 110523288A
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- reverse osmosis
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- osmosis membrane
- washing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of preparation methods of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent, specifically includes the following steps: the selection and weighing of S1, raw material, S2, just mixed liquid are mixed with, and the preparation of S3, reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent, the present invention relates to reverse osmosis membrane cleaning technique fields.The preparation method of the reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent, the state of affairs is avoided to deteriorate, restore former membranaceous condition, extend the service life of film, it reduces costs and personal expenditures, reduce pressure difference, salt rejection rate increases, it is obvious that producing water ratio increases cleaning effect, normal operation, very good solution is in reverse osmosis unit after longtime running, colloid can be accumulated in concentrated water side on film, metal oxide, bacterium, organic matter, the substances such as scale, the problem for causing film dirt stifled, to make membrane flux improve, component inlet outlet pressure differential reduces, salt rejection rate rises, it is obvious by conventional cleaning effect, cleaning frequency reduces, water yield greatly improves.
Description
Technical field
The present invention relates to reverse osmosis membrane cleaning technique field, specially a kind of system of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent
Preparation Method.
Background technique
Reverse osmosis membrane dirt is stifled to show as serious high calcium, high magnesium and silica, the dirt of pipe network iron oxide deposits object
Stifled and pollution has become the biggest obstacle that counter-infiltration system is run steadily in the long term, show that dirty stifled object is heavy for calcium and magnesium ferrosilicon dirt through analysis
The dirt of product object is stifled, needs effectively practical cleaning technique to realize the operation steady in a long-term of counter-infiltration system.
The problem of designing or run with water supply source worsening and pretreatment system, reverse osmosis membrane utilizes chemical cleaning
Method, with anthology reagent by deposit calcium carbonate, magnesium carbonate and ferrosilite, calcium silicates and iron oxide dirt, by chemical
Acid and chelation etc., it is effective by reaction, the deposit on film is eliminated, the cleaning way of reverse osmosis membrane is divided at present
Off line cleaning way and on-line cleaning mode, off line cleaning refer to and split out reverse osmosis membrane from system, to single branch membrane module into
Row chemical cleaning, thoroughly, cleaning effect is good, but scavenging period is longer for the cleaning of this cleaning wayization, dirt removal it is thorough.
Conventional on-line cleaning mainly carries out anti-seepage membrane using the cleaning corollary apparatus connecting with system clear at present
It washes, short for scavenging period the characteristics of on-line cleaning, easy to operate, expense is cleaned low compared with off line, but cleaning effect is cleaned compared with off line
Want poor, the stifled Resolving probiems of dirt are not thorough, and therefore, there is an urgent need to develop a kind of excellent reverse osmosis membrane cleaning agent formulas, solve film
Dirt block up problem, reduce pressure difference, salt rejection rate increase, producing water ratio increase cleaning effect it is obvious, normal operation.
The present invention is solved in reverse osmosis unit after longtime running, concentrated water side accumulation colloid, metal can be aoxidized on film
The substances such as object, bacterium, organic matter, scale cause film dirt stifled, membrane flux are caused to reduce, and component inlet outlet pressure differential increases, salt rejection rate
Decline, unobvious by conventional cleaning effect, cleaning frequency increases, the big heavy discount of water yield, the knot of simultaneous inorganic matter
Dirt, the stifled ingredient of dirt is more complicated, and it is apparent and have that film weight at 20 kilograms or more, for this existing phenomenon has developed a kind of effect
The cleaning agents of membrane of selectivity is to solve the problems, such as that the dirt of film is stifled.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of preparation sides of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent
Method is solved in reverse osmosis unit after longtime running, can on film concentrated water side accumulation colloid, metal oxide, bacterium, organic
The substances such as object, scale cause film dirt stifled, membrane flux are caused to reduce, and component inlet outlet pressure differential increases, salt rejection rate decline, by normal
Advise the problem of cleaning effect is unobvious, and cleaning frequency increases, water yield big heavy discount.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: a kind of reverse osmosis membrane calcium and magnesium ferrosilicon dirt
The preparation method of cleaning agent, specifically includes the following steps:
The selection and weighing of S1, raw material: citric acid of the desired weight than part, grass are distinguished by weighing equipment first
Acid, hydrofluoric acid, boric acid, hydrochloric acid and ACS aqueous solution, and saved by storing equipment, in case using；
S2, just mixed liquid are mixed with: and then the ACS aqueous solution for measuring step S1 is added in stirring container, opens stirring,
The step S1 boric acid measured and hydrochloric acid are added sequentially in stirring container again, at normal temperatures and pressures, mixing speed 70-80r/
Min stirs 8-12min, keeps boric acid and dissolving with hydrochloric acid bright；
The preparation of S3, reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent: the step S1 oxalic acid measured and citric acid are successively added again
Enter the stirring and dissolving into the stirring container in step S2, it is in uniform clear liquid that hydrofluoric acid mixing time 1-2h, which is then added, i.e.,
Reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent can be obtained.
Preferably, the raw material of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent includes: 18-21 parts of citric acid, grass by weight part
8-12 parts sour, 6-7 parts of hydrofluoric acid, 2-3 parts of boric acid, 2-3 parts of hydrochloric acid and 57-61 parts of ACS aqueous solution.
Preferably, the raw material of the formula A of the reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent includes: 18 parts of lemons by weight part
Lemon acid, 12 parts of oxalic acid, 7 parts of hydrofluoric acid, 3 parts of boric acid, 3 parts of hydrochloric acid and 57 parts of ACS aqueous solutions.
Preferably, the raw material of the formula B of the reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent includes: 20 parts of lemons by weight part
Lemon acid, 10 parts of oxalic acid, 5 parts of hydrofluoric acid, 3 parts of boric acid, 2 parts of hydrochloric acid and 60 parts of ACS aqueous solutions.
Preferably, the raw material of the formula C of the reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent includes: 21 parts of lemons by weight part
Lemon acid, 8 parts of oxalic acid, 6 parts of hydrofluoric acid, 2 parts of boric acid, 2 parts of hydrochloric acid and 61 parts of ACS aqueous solutions.
Preferably, the concentration of the ACS aqueous solution is 3%.
Preferably, the reverse osmosis membrane cleaning agent application method of the step S1 preparation, specifically includes the following steps:
T1, first by the acidic cleaner prepared be heated to 30-35 DEG C it is stand-by；
T2, then by reverse osmosis acidic cleaner with 1:10 dilution proportion to reverse osmosis membrane carry out off line chemical cleaning.
Preferably, when the step T2 carries out off line chemical cleaning, adjusting pH value with hydrochloric acid is 2.
(3) beneficial effect
The present invention provides a kind of preparation methods of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent.Have compared with prior art
Below the utility model has the advantages that the preparation method of the reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent, specifically includes the following steps: S1, raw material
It chooses and weighs: desired weight being distinguished than the citric acid of part, oxalic acid, hydrofluoric acid, boric acid, hydrochloric acid by weighing equipment first
It with ACS aqueous solution, and is saved by storing equipment, in case using, S2, just mixed liquid are mixed with: and then by step S1
The ACS aqueous solution of measurement is added in stirring container, opens stirring, then the step S1 boric acid measured and hydrochloric acid are added sequentially to stir
In container, at normal temperatures and pressures, mixing speed 70-80r/min stirs 8-12min, keeps boric acid and dissolving with hydrochloric acid bright, S3,
The preparation of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent: the step S1 oxalic acid measured and citric acid are added sequentially in step S2 again
Stirring container in stirring and dissolving, then be added hydrofluoric acid mixing time 1-2h be in uniform clear liquid, can be obtained reverse osmosis
Film calcium and magnesium ferrosilicon scale washing agent, by having developed, a kind of effect is apparent and selective cleaning agents of membrane is to solve film
The stifled problem of dirt, stifled in the dirt that can effectively remove inorganic matter, cleaning effect is good, and thoroughly, the method for on-line cleaning is not for cleaning
The operation pressure of reverse osmosis membrane can be reduced, therefore is then needed clear by off line in the water yield of short time fast quick-recovery counter-infiltration system
The mode washed goes to alleviate reverse osmosis pressure, the state of affairs is avoided to deteriorate, and restores former membranaceous condition, extends the service life of film, reduces
Cost and personal expenditures, reduce pressure difference, and salt rejection rate increases, and it is obvious that producing water ratio increases cleaning effect, normal operation, very well
Solve in reverse osmosis unit after longtime running, can on film concentrated water side accumulation colloid, metal oxide, bacterium, organic
The substances such as object, scale, the problem for causing film dirt stifled, so that membrane flux be made to improve, component inlet outlet pressure differential is reduced, in salt rejection rate
It rises, obvious by conventional cleaning effect, cleaning frequency reduces, and water yield greatly improves.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the present invention provides three kinds of technical solutions: a kind of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent
Preparation method specifically includes following embodiment:
Embodiment 1
The selection and weighing of S1, raw material: first by weighing equipment distinguish desired weight than part 18 parts of citric acids,
12 parts of oxalic acid, 7 parts of hydrofluoric acid, 3 parts of boric acid, 3 parts of hydrochloric acid and 57 parts of ACS aqueous solutions, and saved by storing equipment, in case
It uses, the concentration of ACS aqueous solution is 3%；
S2, just mixed liquid are mixed with: and then the ACS aqueous solution for measuring step S1 is added in stirring container, opens stirring,
The step S1 boric acid measured and hydrochloric acid are added sequentially in stirring container again, at normal temperatures and pressures, mixing speed 75r/
Min stirs 10min, keeps boric acid and dissolving with hydrochloric acid bright；
The preparation of S3, reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent: the step S1 oxalic acid measured and citric acid are successively added again
Enter the stirring and dissolving into the stirring container in step S2, it is in uniform clear liquid that hydrofluoric acid mixing time 1.5h, which is then added, i.e.,
Reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent A can be obtained.
Embodiment 2
The selection and weighing of S1, raw material: first by weighing equipment distinguish desired weight than part 20 parts of citric acids,
10 parts of oxalic acid, 5 parts of hydrofluoric acid, 3 parts of boric acid, 2 parts of hydrochloric acid and 60 parts of ACS aqueous solutions, and saved by storing equipment, in case
It uses, the concentration of ACS aqueous solution is 3%；
S2, just mixed liquid are mixed with: and then the ACS aqueous solution for measuring step S1 is added in stirring container, opens stirring,
The step S1 boric acid measured and hydrochloric acid are added sequentially in stirring container again, at normal temperatures and pressures, mixing speed 70r/
Min stirs 8min, keeps boric acid and dissolving with hydrochloric acid bright；
The preparation of S3, reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent: the step S1 oxalic acid measured and citric acid are successively added again
Enter the stirring and dissolving into the stirring container in step S2, it is in uniform clear liquid that hydrofluoric acid mixing time 1h, which is then added,
Obtain reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent B.
Embodiment 3
The selection and weighing of S1, raw material: first by weighing equipment distinguish desired weight than part 21 parts of citric acids,
8 parts of oxalic acid, 6 parts of hydrofluoric acid, 2 parts of boric acid, 2 parts of hydrochloric acid and 61 parts of ACS aqueous solutions, and saved by storing equipment, in case
It uses, the concentration of ACS aqueous solution is 3%；
S2, just mixed liquid are mixed with: and then the ACS aqueous solution for measuring step S1 is added in stirring container, opens stirring,
The step S1 boric acid measured and hydrochloric acid are added sequentially in stirring container again, at normal temperatures and pressures, mixing speed 80r/
Min stirs 12min, keeps boric acid and dissolving with hydrochloric acid bright；
The preparation of S3, reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent: the step S1 oxalic acid measured and citric acid are successively added again
Enter the stirring and dissolving into the stirring container in step S2, it is in uniform clear liquid that hydrofluoric acid mixing time 2h, which is then added,
Obtain reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent C.
The application method of reverse osmosis membrane cleaning agent produced by the present invention, specifically includes the following steps:
T1, first by the acidic cleaner prepared be heated to 30-35 DEG C it is stand-by；
T2, then by reverse osmosis acidic cleaner with 1:10 dilution proportion to reverse osmosis membrane carry out off line chemical cleaning, In
When carrying out off line chemical cleaning, adjusting pH value with hydrochloric acid is 2.
Test examples
The Tao Shi film for blocking up 3 last branch films of serious two sections of certain chemical industry fielded system to dirt carries out off line cleaning, clearly
Washing result see the table below 1.
1 wash result tables of data of table
By upper 1 date comprision of table, pottery of the test examples to 3 last branch films of dirty stifled serious two sections of certain system
Family name's film carries out off line cleaning, and cleaning front and back filters out acid pickling agent B formula most preferably in system platform, using various concentration
Cleaning program cleaning effect is different, and the film that data show that 2 sections of inorganic matter foulings are shown varies in weight, can not with conventional cleaning agent
Effect of retrograde perfusion, significant with elimination effect of the product to dirty stifled object, water yield is promoted obviously, and salt rejection rate rise is basically unchanged.
The reverse osmosis cleaning agent of the present invention can be removed effectively inorganic scaling (fouling of calcium and magnesium ferrosilicon), cracking to have restored to produce
Water reduces the operation pressure of reverse osmosis membrane, extends film service life.
The present invention carries out off line with a coal chemical industry example and cleans, and the system cycle of operation was extended by original 3 months after cleaning
By 6-8 months, illustrate that the present invention can thoroughly remove the inorganic scaling object on film.
Acidic cleaner of the present invention is formulated B, and by 1 data confirm that of example and table, the reverse osmosis cleaning agent of the present invention is market
Upper affordable rinse product.
Acidic cleaner performance parameter are as follows: PH1% < 2.0, density > 1.2, contain >=38% admittedly, reach design requirement.
In summary
A kind of effect is apparent and selective cleaning agents of membrane is stifled to solve the dirt of film by having developed by the present invention
Problem, stifled in the dirt that can effectively remove inorganic matter, cleaning effect is good, and thoroughly, the method for on-line cleaning cannot be for cleaning
The water yield of short time fast quick-recovery counter-infiltration system, reduces the operation pressure of reverse osmosis membrane, therefore then needs through off line cleaning
Mode goes to alleviate reverse osmosis pressure, the state of affairs is avoided to deteriorate, and restores former membranaceous condition, extends the service life of film, reduce into
This and personal expenditures, reduce pressure difference, and salt rejection rate increases, and producing water ratio increases that cleaning effect is obvious, and normal operation solves well
It has determined in reverse osmosis unit after longtime running, colloid, metal oxide, bacterium, organic matter, water can have been accumulated in concentrated water side on film
The substances such as dirt, the problem for causing film dirt stifled, so that membrane flux be made to improve, component inlet outlet pressure differential is reduced, and salt rejection rate rises, and is passed through
Conventional cleaning effect is obvious, and cleaning frequency reduces, and water yield greatly improves.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (8)
1. a kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent, it is characterised in that: specifically includes the following steps:
The selection and weighing of S1, raw material: citric acid, oxalic acid, hydrogen of the desired weight than part are distinguished by weighing equipment first
Fluoric acid, boric acid, hydrochloric acid and ACS aqueous solution, and saved by storing equipment, in case using；
S2, just mixed liquid are mixed with: and then the ACS aqueous solution for measuring step S1 is added in stirring container, opens stirring, then will
The boric acid and hydrochloric acid that step S1 is measured are added sequentially in stirring container, at normal temperatures and pressures, mixing speed 70-80r/min,
8-12min is stirred, keeps boric acid and dissolving with hydrochloric acid bright；
The preparation of S3, reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent: the step S1 oxalic acid measured and citric acid are added sequentially to again
Stirring and dissolving in stirring container in step S2, it is in uniform clear liquid that hydrofluoric acid mixing time 1-2h, which is then added, can be obtained
To reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent.
2. a kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent according to claim 1, it is characterised in that: anti-
The raw material of permeable membrane calcium and magnesium ferrosilicon scale washing agent includes: 18-21 parts of citric acid, 8-12 parts of oxalic acid, hydrofluoric acid 6-7 by weight part
Part, 2-3 parts of boric acid, 2-3 parts of hydrochloric acid and 57-61 parts of ACS aqueous solution.
3. a kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent according to claim 2, it is characterised in that: institute
It includes: 18 parts of citric acids, 12 parts of oxalic acid, 7 parts that the raw material of the formula A of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent, which is stated, by weight part
Hydrofluoric acid, 3 parts of boric acid, 3 parts of hydrochloric acid and 57 parts of ACS aqueous solutions.
4. a kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent according to claim 2, it is characterised in that: institute
It includes: 20 parts of citric acids, 10 parts of oxalic acid, 5 parts that the raw material of the formula B of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent, which is stated, by weight part
Hydrofluoric acid, 3 parts of boric acid, 2 parts of hydrochloric acid and 60 parts of ACS aqueous solutions.
5. a kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent according to claim 2, it is characterised in that: institute
It includes: 21 parts of citric acids, 8 parts of oxalic acid, 6 parts that the raw material of the formula C of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent, which is stated, by weight part
Hydrofluoric acid, 2 parts of boric acid, 2 parts of hydrochloric acid and 61 parts of ACS aqueous solutions.
6. a kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent according to claim 1, it is characterised in that: institute
The concentration for stating ACS aqueous solution is 3%.
7. a kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent according to claim 1, it is characterised in that: institute
The reverse osmosis membrane cleaning agent application method of step S1 preparation is stated, specifically includes the following steps:
T1, first by the acidic cleaner prepared be heated to 30-35 DEG C it is stand-by；
T2, then by reverse osmosis acidic cleaner with 1:10 dilution proportion to reverse osmosis membrane carry out off line chemical cleaning.
8. a kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent according to claim 7, it is characterised in that: institute
When stating step T2 progress off line chemical cleaning, adjusting pH value with hydrochloric acid is 2.
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| CN201910832293.2A CN110523288A (en) | 2019-09-04 | 2019-09-04 | A kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent |
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| CN201910832293.2A CN110523288A (en) | 2019-09-04 | 2019-09-04 | A kind of preparation method of reverse osmosis membrane calcium and magnesium ferrosilicon scale washing agent |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050215458A1 (en) * | 2003-10-02 | 2005-09-29 | Mionix Corporation | Cleaning and sanitizing wipes |
| CN102553452A (en) * | 2012-01-10 | 2012-07-11 | 蓝星环境工程有限公司 | Membrane cleaning agent for cleaning reverse osmosis membrane and application method |
| CN103418244A (en) * | 2013-06-29 | 2013-12-04 | 北京工业大学 | Membrane module |
-
2019
- 2019-09-04 CN CN201910832293.2A patent/CN110523288A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050215458A1 (en) * | 2003-10-02 | 2005-09-29 | Mionix Corporation | Cleaning and sanitizing wipes |
| CN102553452A (en) * | 2012-01-10 | 2012-07-11 | 蓝星环境工程有限公司 | Membrane cleaning agent for cleaning reverse osmosis membrane and application method |
| CN103418244A (en) * | 2013-06-29 | 2013-12-04 | 北京工业大学 | Membrane module |
Non-Patent Citations (1)
| Title |
|---|
| 张晓丽，王海玲: "ACS的功效，配伍使用", 《酸性硫酸钙的功效及其应用的研究进展》 * |
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Application publication date: 20191203 |