CN102489160A - Cleaning method for calcium scale of reverse osmosis membrane - Google Patents
Cleaning method for calcium scale of reverse osmosis membrane Download PDFInfo
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- CN102489160A CN102489160A CN2011104137743A CN201110413774A CN102489160A CN 102489160 A CN102489160 A CN 102489160A CN 2011104137743 A CN2011104137743 A CN 2011104137743A CN 201110413774 A CN201110413774 A CN 201110413774A CN 102489160 A CN102489160 A CN 102489160A
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Abstract
A cleaning method for calcium scale of a reverse osmosis membrane sequentially comprises the following steps: 1 washing a reverse osmosis membrane washed by purified water in circulation mode by utilizing citric acid solution for 2.5 to 3.5 hours, and then washing the reverse osmosis membrane by utilizing the purified water till the potential of hydrogen (pH) value is 5-7; and 2 washing the reverse osmosis membrane by utilizing mixed solution of sodium tripolyphosphate and ethylene diamine tetraacetic acid tetrasodium salt for 2.5-3.5 hours, and then washing the reverse osmosis membrane by utilizing the purified water till the pH value is 5-7. In the cleaning method, calcium carbonate is removed by utilizing citric acid, and calcium sulfate attached to the surface of the reverse osmosis membrane is removed by utilizing the sodium tripolyphosphate and the ethylene diamine tetraacetic acid tetrasodium salt. The cleaning method has the advantages that the reverse osmosis membrane is not easy to block, and cleaning effect is good; adopted chemicals are all commercially available products and have low prices and simple prescriptions; the cleaning method is simple to operate and easy to control.
Description
Technical field
The present invention relates to a kind of reverse osmosis membrane calcium dirt cleaning method.
Background technology
Purified water is the pharmaceutical technology water, is that drinking water passes through multi-medium filtering, activated carbon filtration, secondary filter, through making behind the reverse osmosis membrane filtration.Permeable membrane is the semipermeable membrane that little molecule could pass through, and anti-seepage membrane is to adopt under the certain pressure, makes little molecule oppositely see through a kind of form of permeable membrane.
Purified water preparation technology adopts the two-pass reverse osmosis explained hereafter; Reverse osmosis membrane is (about 1 year) in use for some time, and its surface engenders the calcium dirt, causes purified water output to reduce or the salt rejection rate reduction; The purified water quality is influenced, changes reverse osmosis membrane and can cause production cost to increase.70% or salt rejection rate that general aquifer yield is lower than theoretical aquifer yield are lower than 99%, will carry out film and clean, and are lower than each item quality standards such as 2 (examination criteria see for details " Chinese pharmacopoeia version in 2010) to guarantee the purifying electrical conductivity of water.Can use half a year after each the cleaning, each film can clean four times.
Be trapped in calcareous for calcium carbonate and calcium sulfate on the reverse osmosis membrane.The calcium dirt of reverse osmosis membrane surface attachment is a calcium carbonate mostly, because the dissolution of calcium carbonate degree is lower, if calcium carbonate is decomposed, causes calcareous coming off a large amount of in the short time easily, forms reverse osmosis membrane and stops up, and causes membrane damage or breaking-up.
Summary of the invention
Technical problem to be solved by this invention provides a kind of reverse osmosis membrane calcium dirt cleaning method, and when requiring to use this method to clean reverse osmosis membrane, reverse osmosis membrane is difficult for stopping up, and cleaning performance is good.
For solving the problems of the technologies described above, the invention provides a kind of reverse osmosis membrane calcium dirt cleaning method, may further comprise the steps successively:
(1), with the reverse osmosis membrane after the purified water flushing with citric acid solution circulation flushing 2.5-3.5 hours, using purified water to wash reverse osmosis membrane to pH value then is 5-7;
(2), with the mixed solution of sodium phosphate trimer and tetrasodium ethylenediamine tetraacetate flushing reverse osmosis membrane 2.5-3.5 hours, using purified water flushing reverse osmosis membrane to pH value then is 5-7.
For the purpose of the concise description problem, below reverse osmosis membrane calcium of the present invention dirt cleaning method is all abbreviated as this cleaning method.
In this cleaning method, utilize citric acid to remove calcium carbonate.Can decompose calcium carbonate but citric acid acidity is more weak, make slowly to come off the calcium carbonate of reverse osmosis membrane surface attachment.When calcium carbonate is slowly decomposed, be rinsed water and wash away, break away from the film surface, the calcareous water of taking off that is rinsed is taken away, and is difficult for stopping up reverse osmosis membrane.
Utilize sodium phosphate trimer and tetrasodium ethylenediamine tetraacetate to remove the calcium sulfate of reverse osmosis membrane surface attachment.Sodium phosphate trimer and calcium sulfate reaction generate tripolyphosphate calcium and sodium sulphate, calcium ion in the tripolyphosphate calcium and tetrasodium ethylenediamine tetraacetate generation chelatropic reaction, and reaction product all is rinsed water and takes away, and can remove the calcium sulfate of reverse osmosis membrane surface attachment.
In sum, this cleaning method has the obstruction of being difficult for reverse osmosis membrane and the good advantage of cleaning performance; The chemicals that adopts is commercially available article, cheap, and prescription is simple; Simple to operate, control easily.
The specific embodiment
Further specify the present invention through embodiment below.
Embodiment 1:
Allotment concentration is the citric acid solution of 1.5% (g/mL): get citric acid 6kg, add purified water to 400L, regulate pH to 2.0 with hydrochloric acid.
Allotment concentration is the sodium phosphate trimer of 2.5% (g/mL) and the mixed solution of tetrasodium ethylenediamine tetraacetate: get sodium phosphate trimer 7.06kg, tetrasodium ethylenediamine tetraacetate 3kg, add purified water to 400L, regulate pH to 9.0 with hydrochloric acid.
Reverse osmosis membrane calcium dirt cleans:
(1), be the citric acid solution circulation flushing 3.5 hours of 1.5% (g/mL) with the concentration that it is good that the reverse osmosis membrane after the purified water flushing uses allotment, using purified water flushing reverse osmosis membrane to pH value then is 5, approaching with purified water pH value;
(2), good concentration is that the sodium phosphate trimer of 2.5% (g/mL) and the mixed solution of tetrasodium ethylenediamine tetraacetate washed reverse osmosis membrane 3.5 hours to use allotment; Using purified water flushing reverse osmosis membrane to pH value then is 5; Approaching with purified water pH value, accomplish the cleaning of reverse osmosis membrane calcium dirt.
Embodiment 2:
Allotment concentration is the citric acid solution of 2.5% (g/mL): get citric acid 10kg, add purified water to 400L, regulate pH to 4.0 with hydrochloric acid.
Allotment concentration is the sodium phosphate trimer of 3% (g/mL) and the mixed solution of tetrasodium ethylenediamine tetraacetate: get sodium phosphate trimer 8.4kg, tetrasodium ethylenediamine tetraacetate 3.6kg, add purified water to 400L, regulate pH to 11 with hydrochloric acid.
Reverse osmosis membrane calcium dirt cleans:
(1), be the citric acid solution circulation flushing 2.5 hours of 2.5% (g/mL) with the concentration that it is good that the reverse osmosis membrane after the purified water flushing uses allotment, using purified water flushing reverse osmosis membrane to pH value then is 7, approaching with purified water pH value;
(2), good concentration is that the sodium phosphate trimer of 3% (g/mL) and the mixed solution of tetrasodium ethylenediamine tetraacetate washed reverse osmosis membrane 2.5 hours to use allotment; Using purified water flushing reverse osmosis membrane to pH value then is 7; Approaching with purified water pH value, accomplish the cleaning of reverse osmosis membrane calcium dirt.
Embodiment 3:
Allotment concentration is the citric acid solution of 2.0% (g/mL): get citric acid 8kg, add purified water to 400L, regulate pH to 3.0 with hydrochloric acid.
Allotment concentration is the sodium phosphate trimer of 2.85% (g/mL) and the mixed solution of tetrasodium ethylenediamine tetraacetate: get sodium phosphate trimer 8kg, tetrasodium ethylenediamine tetraacetate 3.4kg, add purified water to 400L, regulate pH to 10 with hydrochloric acid.
Reverse osmosis membrane calcium dirt cleans:
(1), be the citric acid solution circulation flushing 3 hours of 2.0% (g/mL) with the concentration that it is good that the reverse osmosis membrane after the purified water flushing uses allotment, using purified water flushing reverse osmosis membrane to pH value then is 6, approaching with purified water pH value;
(2), good concentration is that the sodium phosphate trimer of 2.85% (g/mL) and the mixed solution of tetrasodium ethylenediamine tetraacetate washed reverse osmosis membrane 3 hours to use allotment; Using purified water flushing reverse osmosis membrane to pH value then is 6; Approaching with purified water pH value, accomplish the cleaning of reverse osmosis membrane calcium dirt.
Above-described only is three embodiments of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the principle of the invention, can also make some modification and improvement, these also should be regarded as belonging to protection scope of the present invention.
Claims (3)
1. reverse osmosis membrane calcium dirt cleaning method may further comprise the steps successively:
(1), with the reverse osmosis membrane after the purified water flushing with citric acid solution circulation flushing 2.5-3.5 hours, using purified water to wash reverse osmosis membrane to pH value then is 5-7;
(2), with the mixed solution of sodium phosphate trimer and tetrasodium ethylenediamine tetraacetate flushing reverse osmosis membrane 2.5-3.5 hours, using purified water flushing reverse osmosis membrane to pH value then is 5-7.
2. reverse osmosis membrane calcium dirt cleaning method according to claim 1, it is characterized in that: the concentration of said citric acid solution is that 1.5-2.5% (g/mL), pH value are 2-4.
3. reverse osmosis membrane calcium dirt cleaning method according to claim 1, it is characterized in that: the concentration of the mixed solution of said sodium phosphate trimer and tetrasodium ethylenediamine tetraacetate is that 2.5--3% (g/mL), pH value are 9-11.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104137743A CN102489160A (en) | 2011-12-10 | 2011-12-10 | Cleaning method for calcium scale of reverse osmosis membrane |
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| CN2011104137743A CN102489160A (en) | 2011-12-10 | 2011-12-10 | Cleaning method for calcium scale of reverse osmosis membrane |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102961969A (en) * | 2012-11-28 | 2013-03-13 | 京科高新（北京）环境科学研究所 | Method and device for slowing down pollution of reverse osmosis membrane and nanofiltration membrane by utilizing soaking of medicament |
| CN107008155A (en) * | 2017-06-02 | 2017-08-04 | 青岛百发海水淡化有限公司 | The cleaning method of milipore filter in a kind of desalinization application |
| CN107261854A (en) * | 2017-08-09 | 2017-10-20 | 广州环投环境服务有限公司 | A kind of cleaning method for the film being used in percolate treating process |
| CN110564518A (en) * | 2019-09-16 | 2019-12-13 | 德蓝水技术股份有限公司 | Special cleaning agent for calcium sulfate and preparation method thereof |
Citations (4)
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| JPH1066972A (en) * | 1996-08-28 | 1998-03-10 | Nomura Micro Sci Co Ltd | Cleaning and regenerating method of separation membrane for water treatment |
| CN101455931A (en) * | 2007-12-13 | 2009-06-17 | 中芯国际集成电路制造(上海)有限公司 | Reverse osmosis membrane on-line chemical cleaning method and cleaning agent |
| CN101455945A (en) * | 2007-12-13 | 2009-06-17 | 中芯国际集成电路制造(上海)有限公司 | Reverse osmosis membrane on-line chemical cleaning method and cleaning agent |
| CN101721916A (en) * | 2008-10-24 | 2010-06-09 | 中国石油化工股份有限公司 | Chemical cleaning method of reverse osmosis membrane |
-
2011
- 2011-12-10 CN CN2011104137743A patent/CN102489160A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1066972A (en) * | 1996-08-28 | 1998-03-10 | Nomura Micro Sci Co Ltd | Cleaning and regenerating method of separation membrane for water treatment |
| CN101455931A (en) * | 2007-12-13 | 2009-06-17 | 中芯国际集成电路制造(上海)有限公司 | Reverse osmosis membrane on-line chemical cleaning method and cleaning agent |
| CN101455945A (en) * | 2007-12-13 | 2009-06-17 | 中芯国际集成电路制造(上海)有限公司 | Reverse osmosis membrane on-line chemical cleaning method and cleaning agent |
| CN101721916A (en) * | 2008-10-24 | 2010-06-09 | 中国石油化工股份有限公司 | Chemical cleaning method of reverse osmosis membrane |
Non-Patent Citations (1)
| Title |
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| 丰德新等: "反渗透膜清洗剂的实验评价方法", 《净水技术》, vol. 24, no. 5, 31 December 2005 (2005-12-31), pages 49 - 51 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102961969A (en) * | 2012-11-28 | 2013-03-13 | 京科高新（北京）环境科学研究所 | Method and device for slowing down pollution of reverse osmosis membrane and nanofiltration membrane by utilizing soaking of medicament |
| CN107008155A (en) * | 2017-06-02 | 2017-08-04 | 青岛百发海水淡化有限公司 | The cleaning method of milipore filter in a kind of desalinization application |
| CN107261854A (en) * | 2017-08-09 | 2017-10-20 | 广州环投环境服务有限公司 | A kind of cleaning method for the film being used in percolate treating process |
| CN110564518A (en) * | 2019-09-16 | 2019-12-13 | 德蓝水技术股份有限公司 | Special cleaning agent for calcium sulfate and preparation method thereof |
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Application publication date: 20120613 |