CN110548406A - Reverse osmosis membrane cleaning agent for sewage and cleaning method - Google Patents
Reverse osmosis membrane cleaning agent for sewage and cleaning method Download PDFInfo
- Publication number
- CN110548406A CN110548406A CN201910855261.4A CN201910855261A CN110548406A CN 110548406 A CN110548406 A CN 110548406A CN 201910855261 A CN201910855261 A CN 201910855261A CN 110548406 A CN110548406 A CN 110548406A
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- cleaning agent
- reverse osmosis
- sewage
- osmosis membrane
- cleaning
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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
-
- 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
- B01D2321/168—Use of other chemical agents
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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 relates to a reverse osmosis membrane cleaning agent for sewage and a cleaning method, belonging to the technical field of sewage desalination, and the reverse osmosis membrane cleaning agent for sewage provided by the invention comprises the following components: demineralized water, ethylene diamine tetraacetate, dodecyl benzene sulfonate and carbonate, and solves the problem that the calcium sulfate scale on the membrane cannot be quickly and thoroughly cleaned and removed.
Description
Technical Field
The invention belongs to the technical field of sewage desalination, and particularly relates to a reverse osmosis membrane cleaning agent for sewage and a cleaning method.
Background
At present, when reverse osmosis membrane for sewage desalination, can have a large amount of calcium sulfate dirt to produce on the membrane, calcium sulfate dirt solubility is very little, hardly react with acid-base, adopt ordinary alkali wash (sodium hydroxide), pickling (hydrochloric acid, citric acid) to reach ideal effect, often cause reverse osmosis membrane system trouble, can not make water, scrap until the membrane, the renewal membrane, consequently, the field needs a reverse osmosis membrane cleaner for sewage urgently, can be fast thorough wash the desorption to calcium sulfate dirt on the membrane.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a reverse osmosis membrane cleaning agent for sewage and a cleaning method that overcome the above problems or at least partially solve the above problems.
The embodiment of the invention provides a reverse osmosis membrane cleaning agent for sewage, which comprises:
Demineralized water, ethylene diamine tetraacetate, dodecyl benzene sulfonate and carbonate.
Further, the ethylene diamine tetraacetic acid salt is ethylene diamine tetraacetic acid tetrasodium and/or ethylene diamine tetraacetic acid tetrapotassium.
Further, the dodecyl benzene sulfonate is sodium dodecyl benzene sulfonate.
Further, the carbonate is sodium carbonate.
Furthermore, according to the mass concentration, the ethylene diamine tetraacetic acid salt in the cleaning agent is 10-20 g/L.
Furthermore, according to the mass concentration, in the cleaning agent, the dodecyl benzene sulfonate is 100-200 mg/L.
Furthermore, according to the mass concentration, the carbonate in the cleaning agent is 6-7 g/L.
further, the pH value of the cleaning agent is 10-12.
Based on the same invention concept, the embodiment of the invention also provides a method for cleaning a reverse osmosis membrane for sewage, which comprises the following steps:
Preparing the cleaning agent, heating the cleaning agent to 30-34 ℃, and cleaning for not less than 48 hours.
Further, the cleaning comprises a cleaning section and a soaking section, and the cleaning section and the soaking section are alternately carried out.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
The reverse osmosis membrane cleaning agent for sewage provided by the embodiment of the invention comprises desalted water, ethylene diamine tetraacetic acid, dodecyl benzene sulfonate and carbonate, wherein after calcium sulfate forms scale salt, hydrochloric acid, nitric acid, hydrofluoric acid and other acids cannot perform chemical reaction, sodium hydroxide and other alkalis cannot perform chemical reaction, the solubility product Ksp of the calcium sulfate is 9.1 × 10 -6, calcium sulfate is decomplexed by EDTA-4 sodium salt, calcium ions in the calcium sulfate are complexed by the EDTA-4 sodium salt to form a complex solution dissolved in water, and the calcium sulfate is reacted.
CaSO4+Na4EDTA+Na2CO3→CaNaEDTA+Na2SO4+H2CO3
When the pH value of the solution is low, the reaction is slow, and when the pH value of the solution is high, the solubility of EDTA4 sodium is high, and the reaction speed is accelerated. The maximum allowable pH of the reverse osmosis membrane is 12. Dodecyl benzene sulfonate can increase the wettability of the solution to solid sodium sulfate.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
in order to solve the technical problems, the general idea of the embodiment of the application is as follows:
The application provides a reverse osmosis membrane cleaning agent for sewage, include:
Demineralized water, ethylene diamine tetraacetate, dodecyl benzene sulfonate and carbonate.
In the application, the ethylene diamine tetraacetic acid salt is ethylene diamine tetraacetic acid tetrasodium and/or ethylene diamine tetraacetic acid tetrapotassium.
In the present application, the dodecylbenzene sulfonate is sodium dodecylbenzene sulfonate.
in the present application, the carbonate is sodium carbonate.
In the application, the ethylene diamine tetraacetate is 10-20g/L according to the mass concentration.
In the application, the mass concentration of the dodecyl benzene sulfonate in the cleaning agent is 100-200 mg/L.
In the cleaning agent, the carbonate is 6-7g/L according to mass concentration.
in the present application, the pH of the cleaning agent is 10 to 12.
Based on the same inventive concept, the embodiment of the application also provides a cleaning method of the reverse osmosis membrane for sewage, which comprises the following steps:
Preparing the cleaning agent, heating the cleaning agent to 30-34 ℃, and cleaning for not less than 48 hours.
in this application, wash including washing section and soaking section, washing section and soaking section go on in turn.
The present application will be described in detail with reference to specific examples.
example 1
a reverse osmosis membrane cleaning agent for sewage, comprising: the cleaning agent comprises desalted water, tetrasodium ethylene diamine tetraacetate, sodium dodecyl benzene sulfonate and sodium carbonate, wherein the tetrasodium ethylene diamine tetraacetate, the sodium dodecyl benzene sulfonate and the sodium carbonate are respectively 10g/L, 100mg/L and 5g/L, and the pH value of the cleaning agent is 12.
Example 2
A reverse osmosis membrane cleaning agent for sewage, comprising: the cleaning agent comprises desalted water, tetrasodium ethylene diamine tetraacetate, sodium dodecyl benzene sulfonate and sodium carbonate, wherein the tetrasodium ethylene diamine tetraacetate, the sodium dodecyl benzene sulfonate and the sodium carbonate are 15g/L, 150mg/L and 5g/L respectively, and the pH value of the cleaning agent is 12.
example 3
A reverse osmosis membrane cleaning agent for sewage, comprising: the cleaning agent comprises desalted water, tetrasodium ethylene diamine tetracetate, sodium dodecyl benzene sulfonate and sodium carbonate, wherein the tetrasodium ethylene diamine tetracetate is 20g/L, the sodium dodecyl benzene sulfonate is 200mg/L, the sodium carbonate is 5g/L, and the pH value of the cleaning agent is 12.
Example 4
A reverse osmosis membrane cleaning agent for sewage, comprising: the cleaning agent comprises desalted water, potassium ethylene diamine tetraacetate, potassium dodecyl benzene sulfonate and potassium carbonate, wherein in the cleaning agent, the potassium ethylene diamine tetraacetate is 10g/L, the potassium dodecyl benzene sulfonate is 100mg/L, the potassium carbonate is 5g/L, and the pH value of the cleaning agent is 12.
comparative example 1
A reverse osmosis membrane cleaning agent for sewage, comprising: the cleaning agent comprises desalted water, tetrasodium ethylene diamine tetraacetate, sodium dodecyl benzene sulfonate and sodium carbonate, wherein the tetrasodium ethylene diamine tetraacetate, the sodium dodecyl benzene sulfonate and the sodium carbonate are respectively 5g/L, 50mg/L and 3g/L, and the pH value of the cleaning agent is 10.
Comparative example 2
A reverse osmosis membrane cleaning agent for sewage, comprising: the cleaning agent comprises desalted water, tetrasodium ethylene diamine tetraacetate, sodium dodecyl benzene sulfonate and sodium carbonate, wherein the tetrasodium ethylene diamine tetraacetate, the sodium dodecyl benzene sulfonate and the sodium carbonate are respectively 25g/L, 240mg/L and 8g/L, and the pH value of the cleaning agent is 12.
The residual amounts of calcium sulfate scale on the reverse osmosis membranes obtained in examples 1 to 4 and comparative examples 1 to 2 and alkali washing (sodium hydroxide) and acid washing (hydrochloric acid) were compared, and the results are shown in Table 1.
The residue of calcium sulfate scale on the reverse osmosis membrane is 0;
● represents that the residual amount of calcium sulfate scale on the reverse osmosis membrane is 40-60%;
■ represents the residual amount of calcium sulfate scale on the reverse osmosis membrane is more than 60%.
TABLE 1
Finally, it should also be noted that 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A reverse osmosis membrane cleaning agent for sewage is characterized by comprising:
Demineralized water, ethylene diamine tetraacetate, dodecyl benzene sulfonate and carbonate.
2. The cleaning agent for reverse osmosis membranes for sewage according to claim 1, wherein the ethylenediaminetetraacetic acid salt is tetrasodium ethylenediaminetetraacetate and/or tetrapotassium ethylenediaminetetraacetate.
3. The cleaning agent for a reverse osmosis membrane for sewage according to claim 1, wherein the dodecylbenzene sulfonate is sodium dodecylbenzene sulfonate.
4. The cleaning agent for a reverse osmosis membrane for sewage according to claim 1, wherein the carbonate is sodium carbonate.
5. The cleaning agent for the reverse osmosis membrane for sewage as claimed in claim 1, wherein the amount of edetate in the cleaning agent is 10-20g/L by mass concentration.
6. The cleaning agent for a reverse osmosis membrane for sewage as claimed in claim 1, wherein the cleaning agent comprises dodecylbenzene sulfonate in an amount of 100-200mg/L by mass.
7. A reverse osmosis membrane cleaning agent for sewage according to claim 1, wherein carbonate is 6-7g/L by mass concentration.
8. The cleaning agent for reverse osmosis membranes for sewage according to claim 1, wherein the pH of the cleaning agent is 10.5-12.
9. A method for cleaning a reverse osmosis membrane for sewage, characterized by comprising:
Preparing the cleaning agent, heating the cleaning agent to 30-34 ℃, and cleaning for not less than 48 hours.
10. The method of claim 9, wherein the cleaning comprises a cleaning section and a soaking section, and the cleaning section and the soaking section are alternately performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910855261.4A CN110548406A (en) | 2019-09-10 | 2019-09-10 | Reverse osmosis membrane cleaning agent for sewage and cleaning method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910855261.4A CN110548406A (en) | 2019-09-10 | 2019-09-10 | Reverse osmosis membrane cleaning agent for sewage and cleaning method |
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| CN110548406A true CN110548406A (en) | 2019-12-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI769425B (en) * | 2019-12-31 | 2022-07-01 | 財團法人工業技術研究院 | Method for cleaning membrane |
| US11738310B2 (en) | 2019-12-31 | 2023-08-29 | Industrial Technology Research Institute | Method for cleaning membrane |
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| US20060108289A1 (en) * | 2004-10-20 | 2006-05-25 | Baker Hughes Incorporated | Methods for removing metals from water |
| CN101757857A (en) * | 2009-11-17 | 2010-06-30 | 上海丰信环保科技有限公司 | Composite cleaning agent for cleaning membrane system with organic fouling |
| CN105688680A (en) * | 2016-04-08 | 2016-06-22 | 北京今大禹环境技术股份有限公司 | Washing method for anti-osmosis film elements |
| CN107149877A (en) * | 2016-03-02 | 2017-09-12 | 上海丰信环保科技有限公司 | Treated sewage reusing film alkaline cleaner |
| CN107469630A (en) * | 2017-09-12 | 2017-12-15 | 山东天庆科技发展有限公司 | Reverse osmosis membrane alkaline cleaner and its application process |
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2019
- 2019-09-10 CN CN201910855261.4A patent/CN110548406A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050227893A1 (en) * | 2004-04-01 | 2005-10-13 | 3M Innovative Properties Company | Aqueous cleaning/treatment composition for fibrous substrates |
| US20060108289A1 (en) * | 2004-10-20 | 2006-05-25 | Baker Hughes Incorporated | Methods for removing metals from water |
| CN101757857A (en) * | 2009-11-17 | 2010-06-30 | 上海丰信环保科技有限公司 | Composite cleaning agent for cleaning membrane system with organic fouling |
| CN107149877A (en) * | 2016-03-02 | 2017-09-12 | 上海丰信环保科技有限公司 | Treated sewage reusing film alkaline cleaner |
| CN105688680A (en) * | 2016-04-08 | 2016-06-22 | 北京今大禹环境技术股份有限公司 | Washing method for anti-osmosis film elements |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI769425B (en) * | 2019-12-31 | 2022-07-01 | 財團法人工業技術研究院 | Method for cleaning membrane |
| US11738310B2 (en) | 2019-12-31 | 2023-08-29 | Industrial Technology Research Institute | Method for cleaning membrane |
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Application publication date: 20191210 |