CN101455931A - Reverse osmosis membrane on-line chemical cleaning method and cleaning agent - Google Patents
Reverse osmosis membrane on-line chemical cleaning method and cleaning agent Download PDFInfo
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- CN101455931A CN101455931A CNA2007100945364A CN200710094536A CN101455931A CN 101455931 A CN101455931 A CN 101455931A CN A2007100945364 A CNA2007100945364 A CN A2007100945364A CN 200710094536 A CN200710094536 A CN 200710094536A CN 101455931 A CN101455931 A CN 101455931A
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Abstract
The invention provides an alkali reverse osmosis membrane cleaning agent, which comprises an ethylene diamine tetraacetic acid tetrasodium salt solution or a sodium dodecyl benzene sulfonate solution or a trimeric sodium phosphate solution, of which the concentration is between 1 and 4 percent and the pH value is between 10 and 12. The cleaning agent adopts common chemicals, so that the cleaning agent has low price and simple formula, and materials of the cleaning agent are available. The invention also provides a method for on-line chemical cleaning of the reverse osmosis membrane, by alternately using an acid reverse osmosis membrane cleaning agent and the alkali reverse osmosis membrane cleaning agent for on-line cleaning of the reverse osmosis membrane, the reverse osmosis membrane can be easily and effectively cleaned, and the cleaning effect is quite obvious; moreover, the technical process can also is easy to control.
Description
Technical field
The present invention relates to technical field of manufacturing semiconductors, online chemical cleaning method of particularly a kind of reverse osmosis membrane and reverse osmosis membrane cleaning agent.
Background technology
Reverse osmosis technology is that what to be grown up early 1960s is the membrane separation technique of driving force with pressure.Therefore advantages such as reverse osmosis technology has no phase transformation, modularization, flow process is simple, easy to operate, floor space is little, reduced investment, power consumption are low have obtained a large amount of utilizations in water treatment.Its range of application spreads all over industries such as electric power, electronics, chemical industry, light industry, coal, environmental protection, medicine, food.Reverse osmosis membrane is the core of counter-infiltration system, the whether good performance that directly influences counter-infiltration system of its service behaviour.
After counter-infiltration system was moving a period of time, the reverse osmosis membrane surface can generate the bacterium layer of indissoluble, the metal dirt, and silicon dirt and pollutants such as other organic matter and inorganic matter cause the counter-infiltration system inlet pressure to increase, and aquifer yield reduces, and saturating salt rate increases.When above-mentioned factor is increased to a certain degree, will carry out Chemical cleaning so that the running status that returns to reverse osmosis membrane.
At present, the cleaning method of reverse osmosis membrane is divided into off-line cleaning way and on-line cleaning mode.Off-line cleans and refers to reverse osmosis membrane is split out from system, then single reverse osmosis membrane is carried out Chemical cleaning, and this cleaning way Chemical cleaning is more thorough, and cleaning performance is good, but scavenging period is long, and cleaning charge is with high; Therefore the on-line cleaning mode is comparatively commonly used.Conventional on-line cleaning mainly is to utilize the purging system that is connected with counter-infiltration system that reverse osmosis membrane is carried out whole cleaning, is not that each reverse osmosis membrane cleans separately.Its characteristics are that scavenging period is short, easy to operate, and expense is cleaned low than off-line, but cleaning performance is not obvious.
Application number provides a kind of method that reverse osmosis membrane in the sewage disposal system is cleaned automatically for 200610011307.7 patent application document, described sewage disposal system comprises pretreatment unit and reverse osmosis units, described reverse osmosis membrane is arranged in described reverse osmosis units, comprises the steps:
(1) make up a prescription: the purge tank moisturizing, open scavenging pump, medicine to be mixed, incorporation time is set as required;
(2) injection: the one-level of medicine by reverse osmosis unit entered secondary be back to washwater tank;
(3) wash cycles: make with medicament carry out Chemical cleaning to the surface of described reverse osmosis membrane;
(4) clean: one-level or the secondary of clear water by reverse osmosis unit is back to washwater tank;
(5) draining: clean and finish,, finish cleaning with the cleaning fluid emptying in pipeline and the purge tank.
Wherein, the described wash cycles of step (3) was divided into for two steps, and the first step is that the one-level of reverse osmosis unit is cleaned, and scavenging period is set as required, arrived setting-up time and entered for second step automatically, and the secondary of reverse osmosis unit is cleaned.
Described cleaning method is the conventional method of in the prior art reverse osmosis membrane being cleaned, and still, in described process, employed cleaning agent is generally the manufacturer of reverse osmosis membrane or the scavenger specially that film cleaning company provides, and it is underground to fill a prescription, and price is expensive.
At above-mentioned situation, the invention provides a kind of new cleaning agent, and the online chemical cleaning method of reverse osmosis membrane that utilizes described cleaning agent to form.
Summary of the invention
In view of this, the technical problem of the present invention's solution provides a kind of new reverse osmosis membrane cleaning agent and utilizes described reverse osmosis membrane cleaning agent to carry out the method for online Chemical cleaning.
A kind of alkaline reverse osmosis membrane cleaning agent comprises:
Concentration is 1～4% tetrasodium salt of EDTA or detergent alkylate semi-annular jade pendant acid sodium or sodium tripolyphosphate solution, and pH is 10～12.
Wherein, the reagent that the pH value of described alkaline reverse osmosis membrane cleaning agent is adjusted between 10～12 is NaOH or potassium hydroxide.
Wherein, the concentration of the optimization of tetrasodium salt of EDTA in the described alkaline reverse osmosis membrane cleaning agent or detergent alkylate semi-annular jade pendant acid sodium or sodium phosphate trimer is 2～3%.
Wherein, the pH value scope of the optimization of described alkaline reverse osmosis membrane cleaning agent is 11～12.
Further, the invention provides the online chemical cleaning method of a kind of reverse osmosis membrane, comprise the steps: to be used alternatingly described acid reverse osmosis membrane cleaning agent and alkaline reverse osmosis membrane cleaning agent reverse osmosis membrane is carried out on-line cleaning.
Described acid reverse osmosis membrane cleaning agent comprises: for concentration is 1～4% Citric Acid Mono or oxalic acid or phosphoric acid solution, pH is 1～4.
Cleaning method of the present invention is to the not too much restriction of cleaning sequence of acid reverse osmosis membrane cleaning agent and alkaline reverse osmosis membrane cleaning agent, specifically, can be: at first, use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is carried out on-line cleaning, then use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is carried out on-line cleaning.Can also be: at first, use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is carried out on-line cleaning, then use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is carried out on-line cleaning.
Further, can repeatedly be used alternatingly acid reverse osmosis membrane cleaning agent and alkaline reverse osmosis membrane cleaning agent carries out online Chemical cleaning to reverse osmosis membrane.
Preferably, the online chemical cleaning method of described reverse osmosis membrane comprises: use described acid reverse osmosis membrane cleaning agent to carry out online Chemical cleaning; Use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is carried out online Chemical cleaning; Using pH is that 11～12 NaOH or potassium hydroxide solution carry out online soaking and washing; Using pH is that 1～2 hydrochloric acid or salpeter solution carry out online soaking and washing, also contains bactericide in described hydrochloric acid or the salpeter solution.
Compared with prior art, such scheme has the following advantages:
Invention provides a kind of alkaline reverse osmosis membrane cleaning agent, adopt common chemicals, cheap, easily buy and fill a prescription simple, it is underground to have overcome the scavenger specially prescription that reverse osmosis membrane manufacturer in the prior art or reverse osmosis membrane cleaning company provide, the defective that price is expensive.
The online chemical cleaning method of reverse osmosis membrane provided by the invention is used alternatingly acid reverse osmosis membrane cleaning agent of the present invention and alkaline reverse osmosis membrane cleaning agent reverse osmosis membrane is carried out on-line cleaning, and is simple, effectively and can access tangible cleaning performance.
The online chemical cleaning method of reverse osmosis membrane provided by the invention need not miscellaneous operating procedure in cleaning process, also need not high-intensity operation.Simple to operate and mostly be repetitive operation, easily grasp.
The online chemical cleaning method of reverse osmosis membrane provided by the invention, the pH value of major control cleaning agent is suitably controlled scavenging period and temperature in the cleaning process, and parameter is simple and easy to control.
The online chemical cleaning method of reverse osmosis membrane provided by the invention is suitable for but is not limited to the online Chemical cleaning that reverse osmosis membrane system consists of the two-stage type reverse osmosis membrane system.
Description of drawings
Fig. 1 is a detergent line figure of the online chemical cleaning method of the embodiment of the invention 2 described reverse osmosis membrane systems;
Fig. 2 is another detergent line figure of the online chemical cleaning method of the embodiment of the invention 2 described reverse osmosis membrane systems;
Fig. 3 is the online chemical cleaning method process chart of the reverse osmosis membrane system of 2 one specific embodiment of embodiment.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
The object of the present invention is to provide new reverse osmosis membrane cleaning agent, to solve manufacturer that adopts reverse osmosis membrane in the prior art usually or the scavenger specially that film cleaning company provides, it is underground to fill a prescription, and the defective that price is expensive reduces production costs.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Present embodiment provides a kind of alkaline reverse osmosis membrane cleaning agent, comprising:
Concentration is 1～4% tetrasodium salt of EDTA (EDTA-4Na) or detergent alkylate semi-annular jade pendant acid sodium or sodium tripolyphosphate solution, and pH is 10～12.
Wherein, the reagent that the pH value of described alkaline reverse osmosis membrane cleaning agent is adjusted between 10～12 is NaOH or potassium hydroxide.
Wherein, the concentration of the optimization of tetrasodium salt of EDTA in the described alkaline reverse osmosis membrane cleaning agent or detergent alkylate semi-annular jade pendant acid sodium or sodium phosphate trimer is 2～3%.
Wherein, the pH value scope of the optimization of described alkaline reverse osmosis membrane cleaning agent is 11～12.
The compound method of described alkaline reverse osmosis membrane cleaning agent is a conventional method, present embodiment provides a kind of embodiment, at first compound concentration is at 1%～4% tetrasodium salt of EDTA (EDTA-4Na) or detergent alkylate semi-annular jade pendant acid sodium or sodium tripolyphosphate solution, then, in described solution, add NaOH or potassium hydroxide etc., described pH value of solution value is adjusted to 11～12.
In a specific embodiment of present embodiment, at first compound concentration is 1% tetrasodium salt of EDTA solution, then, adds NaOH in described solution, and described pH value of solution value is adjusted to 12.
In another specific embodiment of present embodiment, at first compound concentration is 4% detergent alkylate semi-annular jade pendant acid sodium solution, then, adds NaOH in described solution, and described pH value of solution value is adjusted to 11.
In another specific embodiment of present embodiment, at first compound concentration is 2% sodium tripolyphosphate solution, then, adds potassium hydroxide in described solution, and described pH value of solution value is adjusted to 10.
In another specific embodiment of present embodiment, at first compound concentration is 3% tetrasodium salt of EDTA solution, then, adds potassium hydroxide in described solution, and described pH value of solution value is adjusted to 11.5.
Described alkaline reverse osmosis membrane cleaning agent can be good at removing the bacterium layer in the reverse osmosis membrane, and silicon dirt and organic matter pollute.Can carry out the off-line Chemical cleaning to reverse osmosis membrane, also can carry out online Chemical cleaning described reverse osmosis membrane.And described cleaning agent is common chemicals, and is cheap, easily buys and fills a prescription simply, and it is underground to have overcome the scavenger specially prescription that reverse osmosis membrane manufacturer in the prior art or reverse osmosis membrane cleaning company provide, the defective that price is expensive.
When described alkaline reverse osmosis membrane cleaning agent carries out online Chemical cleaning in conjunction with other acid reverse osmosis membrane cleaning agent to reverse osmosis membrane, can clean reverse osmosis membrane simply and easily, obtain cleaning performance preferably.
Adopt the described alkaline reverse osmosis membrane cleaning agent of present embodiment that the concrete grammar that reverse osmosis membrane carries out on-line cleaning is done a description below in conjunction with 1,2,3 pairs in accompanying drawing.
Adopt the described alkaline reverse osmosis membrane cleaning agent of present embodiment to be: to be used alternatingly acid reverse osmosis membrane cleaning agent and alkaline reverse osmosis membrane cleaning agent cleans reverse osmosis membrane to the method that reverse osmosis membrane carries out online Chemical cleaning.
Described acid reverse osmosis membrane cleaning agent comprises: concentration is 1～4% Citric Acid Mono (C
6H
8O
7H
2O) or oxalic acid or phosphoric acid solution, the pH of described solution is 1～4.
The compound method of described acid reverse osmosis membrane cleaning agent is a conventional method, present embodiment provides a kind of embodiment, at first compound concentration is at 1%～4% Citric Acid Mono or oxalic acid or phosphoric acid solution, then, in described solution, add hydrochloric acid or nitric acid etc., described pH value of solution value is adjusted to 1～4.
The Citric Acid Mono of described acid reverse osmosis membrane cleaning agent or the concentration of oxalic acid or phosphoric acid solution are optimized, and concentration range is 2～3% preferably, and further, the pH value scope of the optimization of described acid reverse osmosis membrane cleaning agent is 1～2.
Preferably, described acid reverse osmosis membrane cleaning agent is that the pH value is 2～3, concentration is 2～3% Citric Acid Mono solution.
Described cleaning method is to the not too much restriction of cleaning sequence of acid reverse osmosis membrane cleaning agent and alkaline reverse osmosis membrane cleaning agent, specifically, can be: at first, use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, then use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned.Can also be: at first, use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, then use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned.
It can be one-level that described reverse osmosis membrane cleans, and the above reverse osmosis membrane of secondary and secondary cleans, commonly used, be that the two-pass reverse osmosis film cleans.
The acid reverse osmosis membrane cleaning agent of described use cleans reverse osmosis membrane or the cleaning equipment that uses alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned can be any conventional equipment of the prior art, and the technology of using described cleaning equipment that reverse osmosis membrane is cleaned can be any common process of the prior art.
Further, can repeatedly be used alternatingly acid reverse osmosis membrane cleaning agent and alkaline reverse osmosis membrane cleaning agent carries out Chemical cleaning to reverse osmosis membrane.
For example: at first, use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, then use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, then, with acid reverse osmosis membrane cleaning agent reverse osmosis membrane is cleaned again, then use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned.
Can also be: at first, use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, then use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned; Then, with alkaline reverse osmosis membrane cleaning agent reverse osmosis membrane is cleaned again, then use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned.
Further, can also be: at first, use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, then use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned; Then, with acid reverse osmosis membrane cleaning agent reverse osmosis membrane is cleaned again, then use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned.
The described employing of present embodiment is described, and to replace the alternated process that acid reverse osmosis membrane cleaning agent and alkaline reverse osmosis membrane cleaning agent clean reverse osmosis membrane can be any one combination that those skilled in the art can expect, do not limit to the alternate combinations mode of lifting with present embodiment.
Provide a kind of alkaline reverse osmosis membrane cleaning agent carries out online Chemical cleaning to described reverse osmosis membrane concrete process below:
1: prepare alkaline reverse osmosis membrane cleaning agent; For example compound concentration is 2% tetrasodium salt of EDTA solution, and the pH value of hydro-oxidation sodium solution adjustment cleaning reagent is 11 then.
2: alkaline reverse osmosis membrane cleaning agent is circulated in cleaning device, make alkaline reverse osmosis membrane cleaning agent in cleaning device, mix and regulate cleaning agent to suitable temperature;
3: be communicated with cleaning device and reverse osmosis membrane to be cleaned, clean described reverse osmosis membrane;
4: adopt the described reverse osmosis membrane of washed with de-ionized water.
Described reverse osmosis membrane refers to the two steps ro film, also can be other first-stage reverse osmosis film or greater than the reverse osmosis membrane of two-stage.
When repeatedly utilizing acid reverse osmosis membrane cleaning agent or alkaline reverse osmosis membrane cleaning agent that described reverse osmosis membrane is carried out online Chemical cleaning, the process that repeats above-mentioned steps 1～4 gets final product.
In order to make the more detailed the present invention of understanding of those skilled in the art, do detailed description below in conjunction with the accompanying drawing 1 and the described a kind of optimized specific embodiment of 2 pairs of present embodiments of accompanying drawing.
Before the online Chemical cleaning of reverse osmosis membrane system, the waste water that comprises in the pipeline of general using deionized water to the Chemical cleaning equipment of reverse osmosis membrane cleans, and method therefor is a method well known to those skilled in the art, is not further described at this.
The technological process as shown in Figure 3 of the concrete processing step of the online chemical cleaning method of described reverse osmosis membrane system.
Step S100: with acid reverse osmosis membrane cleaning agent reverse osmosis membrane is cleaned, described reverse osmosis membrane is the two steps ro film.Concrete process is:
1) preparation acids cleaning agent 1: obtain solution concentration is 2% Citric Acid Mono solution, is 1 with the salt acid for adjusting pH value.
2) acid reverse osmosis membrane cleaning agent is circulated in cleaning device, acid reverse osmosis membrane cleaning agent is mixed in cleaning device and adjustment of acidity reverse osmosis membrane cleaning agent to suitable temperature.
In conjunction with the accompanying drawings shown in 2, the concrete operations step is: open hand-operated valve 15, open scavenging pump 18 (pump),------hand-operated valve 15---heater 20---circulates in the system of Chemical Cleaning for Reverse Osmosis jar 19 scavenging pump 18 to make acid reverse osmosis membrane cleaning agent at Chemical Cleaning for Reverse Osmosis jar 19, while heater 20, when the temperature that is heated to acidic cleaning solution is 30～35 degrees centigrade, close heater 20.
3) be communicated with cleaning device and reverse osmosis membrane to be cleaned, clean described reverse osmosis membrane.
A) carry out the cleaning of 1 grade of reverse osmosis membrane: with reference to the accompanying drawings 1 and accompanying drawing 2, arrow points in the accompanying drawing is represented the flow direction of cleaning fluid or deionized water, pipeline 1 in accompanying drawing 1 and the accompanying drawing 2, pipeline 2, pipeline 3, pipeline 4 are communicated with the detergent line that promptly forms closure, and reverse osmosis membrane chamber 21 wherein is for comprising the water treatment facilities of first order reverse osmosis membrane.
Open hand-operated valve 14,6,7,11,12, and open dense water valve (not shown) in the reverse osmosis membrane chamber 1, turn hand-operated valve 15 down, filter outlet pressure is circulated under 50psi, 20～30 minutes circulation timei, notice that during this time pH changes, pH added hydrochloric acid greater than 2.5 o'clock and is adjusted between 1～2.After time circulation timei arrives, transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.Detect pH, regulate if necessary between pH to 1～2.
Press aforesaid operations, wash completely until reverse osmosis membrane system one-level acid, close all hand-operated valves.
B) carry out the cleaning of 2 grades of reverse osmosis membranes: with reference to the accompanying drawings 1 and accompanying drawing 2, arrow points in the accompanying drawing is represented the flow direction of cleaning fluid or deionized water, pipeline 1 in accompanying drawing 1 and the accompanying drawing 2, pipeline 2, pipeline 3, pipeline 4 are communicated with the detergent line that promptly forms closure, and reverse osmosis membrane chamber 22 wherein is for comprising the water treatment facilities of second level reverse osmosis membrane.
Open hand-operated valve 14,8,9,11,12, and open dense water valve (not shown) in the reverse osmosis membrane chamber 2, turn hand-operated valve 15 down, filter outlet pressure is circulated under 50psi, 20～30 minutes circulation timei, notice that during this time pH changes, pH added hydrochloric acid greater than 2.5 o'clock and is adjusted between 1～2.After time circulation timei arrives, transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.Detect pH, regulate if necessary between pH to 1～2.
Press aforesaid operations, wash complete until reverse osmosis membrane system secondary acid.Confirm that hand-operated valve 1 to the hand-operated valve of hand-operated valve 15 is closed condition.
4) adopt water to clean described reverse osmosis membrane
Bleed off the acidic cleaning solution of 19 li in Chemical Cleaning for Reverse Osmosis jar, open hand-operated valve 14 and fill deionized water, open hand-operated valve 15, open scavenging pump 18 and circulate.
Flushing reverse osmosis membrane one-level: open hand-operated valve 14,6,7,11,13, open all dense water valves of one-level in reverse osmosis membrane chamber.Turn hand-operated valve 15 down, wash, water outlet is drained through hand-operated valve 13.Measure the pH of draining, when pH 7 the time, stops flushing near neutral.Transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.
Flushing reverse osmosis membrane secondary: open hand-operated valve 14,8,9,11,13, open all dense water valves of secondary in reverse osmosis membrane chamber.Turn hand-operated valve 15 down, wash, water outlet is drained through hand-operated valve 13.Measure the pH of draining, when pH 7 the time, stops flushing near neutral.Close scavenging pump 18, confirm that hand-operated valve 1 to the hand-operated valve of hand-operated valve 15 is closed condition.
Step S110 uses alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, and described reverse osmosis membrane is the two steps ro film.Concrete process is:
1) the alkaline reverse osmosis membrane cleaning agent 1 of preparation: the EDTA～4Na of obtain solution concentration about 2～3%, regulate the pH value between 11～12 with NaOH.
2) alkaline reverse osmosis membrane cleaning agent is circulated in cleaning device, make alkaline reverse osmosis membrane cleaning agent in cleaning device, mix and regulate alkaline reverse osmosis membrane cleaning agent to suitable temperature: in conjunction with the accompanying drawings 2, open hand-operated valve 15, open scavenging pump 18 (pump),------hand-operated valve 15---heater 20---circulates in the system of Chemical Cleaning for Reverse Osmosis jar 19 scavenging pump 18 to make alkaline reverse osmosis membrane cleaning agent at Chemical Cleaning for Reverse Osmosis jar 19, while heater 20, when the temperature that is heated to alkaline cleaning fluid is 30～35 degrees centigrade, close heater 20.
3) be communicated with cleaning device and reverse osmosis membrane to be cleaned, clean described reverse osmosis membrane.
A) carry out the cleaning of 1 grade of reverse osmosis membrane: with reference to the accompanying drawings 1 and accompanying drawing 2, arrow points in the accompanying drawing is represented the flow direction of cleaning fluid or deionized water, pipeline 1 in accompanying drawing 1 and the accompanying drawing 2, pipeline 2, pipeline 3, pipeline 4 are communicated with the detergent line that promptly forms closure, and reverse osmosis membrane chamber 21 wherein is for comprising the water treatment facilities of first order reverse osmosis membrane.
Open hand-operated valve 14,6,7,11,12, and open dense water valve (not shown) in the reverse osmosis membrane chamber 1, turn hand-operated valve 15 down, filter outlet pressure is circulated under 50psi, 20～30 minutes circulation timei, notice that during this time pH changes, pH is adjusted between 11～12 less than 11 o'clock hydro-oxidation sodium.After time circulation timei arrives, transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.Detect pH, regulate if necessary between pH to 11～12.
Press aforesaid operations, wash completely until reverse osmosis membrane system one-level acid, close all hand-operated valves.
B) carry out the cleaning of 2 grades of reverse osmosis membranes: with reference to the accompanying drawings 1 and accompanying drawing 2, arrow points in the accompanying drawing is represented the flow direction of cleaning fluid or deionized water, pipeline 1 in accompanying drawing 1 and the accompanying drawing 2, pipeline 2, pipeline 3, pipeline 4 are communicated with the detergent line that promptly forms closure, and reverse osmosis membrane chamber 22 wherein is for comprising the water treatment facilities of second level reverse osmosis membrane.
Open hand-operated valve 14,8,9,11,12, and open dense water valve (not shown) in the reverse osmosis membrane chamber 2, turn hand-operated valve 15 down, filter outlet pressure is circulated under 50psi, 20～30 minutes circulation timei, notice that during this time pH changes, pH is adjusted between 11～12 less than 11 o'clock hydro-oxidation sodium.After time circulation timei arrives, transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.Detect pH, regulate if necessary between pH to 11～12.
Press aforesaid operations, wash complete until reverse osmosis membrane system secondary acid.Confirm that hand-operated valve 1 to the hand-operated valve of hand-operated valve 15 is closed condition.
4) adopt water to clean described reverse osmosis membrane
Bleed off the alkaline cleaning fluid of 19 li in Chemical Cleaning for Reverse Osmosis jar, open hand-operated valve 14 and fill deionized water, open hand-operated valve 15, open scavenging pump 18 and circulate.
Flushing reverse osmosis membrane one-level: open hand-operated valve 14,6,7,11,13, open all dense water valves of one-level in reverse osmosis membrane chamber.Turn hand-operated valve 15 down, wash, water outlet is drained through hand-operated valve 13.Measure the pH of draining, when pH 7 the time, stops flushing near neutral.Transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.
Flushing reverse osmosis membrane secondary: open hand-operated valve 14,8,9,11,13, open all dense water valves of secondary in reverse osmosis membrane chamber.Turn hand-operated valve 15 down, wash, water outlet is drained through hand-operated valve 13.Measure the pH of draining, when pH 7 the time, stops flushing near neutral.Close scavenging pump 18, confirm that hand-operated valve 1 to the hand-operated valve of hand-operated valve 15 is closed condition.
Step S120: use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, described reverse osmosis membrane is the two steps ro film.Description among the concrete process refer step S110.
Step S130: use acid reverse osmosis membrane cleaning agent that reverse osmosis membrane is cleaned, described reverse osmosis membrane is the two steps ro film.Description among the concrete process refer step S100.
Be more preferably, the online chemical cleaning method of the described reverse osmosis membrane of present embodiment, being used alternatingly after acid reverse osmosis membrane and alkaline reverse osmosis membrane clean, can also continue to use other reagent to carry out online soaking and washing, the dirt that may exist with better place to go.
In a specific embodiment, comprise the steps: to use described acid reverse osmosis membrane cleaning agent to carry out online Chemical cleaning; Use alkaline reverse osmosis membrane cleaning agent that reverse osmosis membrane is carried out online Chemical cleaning; Using pH is that 11～12 NaOH or potassium hydroxide solution carry out online soaking and washing; Using pH is that 1～2 hydrochloric acid or salpeter solution carry out online soaking and washing, also contains bactericide in described hydrochloric acid or the salpeter solution.
Wherein, adopt acid reverse osmosis membrane cleaning agent and use alkaline reverse osmosis membrane cleaning agent to carry out the technology and the method for operating of online Chemical cleaning identical, describe no longer one by one with the method for described step S100 of present embodiment and step S110.
Using pH is that the concrete grammar that 11～12 NaOH or potassium hydroxide solution carry out online soaking and washing is: with reference to the accompanying drawings 1 and accompanying drawing 2, arrow points in the accompanying drawing is represented the flow direction of cleaning fluid or deionized water, at first, the NaOH cleaning agent of configuration pH between 11～12, then, open hand-operated valve 15, open scavenging pump 18 and circulate, heater 20 is heated to 30～35 degrees centigrade of water temperatures, closes heater 20.
Again then, carry out the circulation of reverse osmosis membrane one sodium hydroxide cleaning agent: open hand-operated valve 14,6,7,11,12, open all dense water valves of one-level in reverse osmosis membrane chamber.Turn hand-operated valve 15 down, wash, water outlet is got back to purge tank through hand-operated valve 12.Be purpose so that cleaning fluid touches reverse osmosis membrane fully 20～30 minutes circulation timei.Transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.
Again then, carry out the circulation of reverse osmosis membrane two sodium hydroxide cleaning agents: open hand-operated valve 14,8,9,11,12, open all dense water valves of secondary in reverse osmosis membrane chamber.Turn hand-operated valve 15 down, wash, water outlet is got back to purge tank through hand-operated valve 12.Be purpose so that cleaning agent touches reverse osmosis membrane fully 20～30 minutes circulation timei.Transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.Close scavenging pump 18, confirm that hand-operated valve 1 to the hand-operated valve of hand-operated valve 15 is closed condition.
Carry out soaking one-level and two-pass reverse osmosis film after the cleaning of one-level and two-pass reverse osmosis film, soak time is 8～12 hours.
After the immersion, adopt the whole clean cycle pipeline of deionized water rinsing: bleed off the cleaning fluid in the purge tank, open hand-operated valve 14 and fill deionized water, open hand-operated valve 15, open scavenging pump 18 and circulate; Flushing reverse osmosis membrane one-level: open hand-operated valve 14,6,7,11,13, open all dense water valves of one-level in reverse osmosis membrane chamber.Turn hand-operated valve 15 down, wash, water outlet is drained through hand-operated valve 13.Measure the pH of draining, when pH 7 the time, stops flushing near neutral.Transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11;
Flushing reverse osmosis membrane secondary: open hand-operated valve 14,8,9,11,13, open all dense water valves of secondary in reverse osmosis membrane chamber, turn hand-operated valve 15 down, wash, water outlet is drained through hand-operated valve 13.Measure the PH of draining, last when PH 7 the time, stops flushing near neutral, close scavenging pump 18, confirm that hand-operated valve 1 to the hand-operated valve of hand-operated valve 15 is closed condition.
Using pH is that the concrete process that 1～2 hydrochloric acid or salpeter solution carry out online soaking and washing is: at first, dispose described cleaning fluid, for example the pH value is 1～2 hydrochloric acid solution, in order to remove the bacterium that may exist in the reverse osmosis membrane, in described hydrochloric acid solution, add bactericide, described bactericide can be the commercially available prod that any routine is used for the reverse osmosis membrane sterilization in the prior art, for example the DOW7287 bactericide; Afterwards, open hand-operated valve 15, open scavenging pump 18 and circulate, it is 30～35 degrees centigrade that heater 20 is heated to the cleaning agent temperature, closes heater 20.
Afterwards, carry out the cleaning of first-stage reverse osmosis film, with reference to the accompanying drawings 1 and accompanying drawing 2, arrow points in the accompanying drawing is represented the flow direction of cleaning fluid or deionized water, pipeline 1 in accompanying drawing 1 and the accompanying drawing 2, pipeline 2, pipeline 3, pipeline 4 are communicated with the detergent line that promptly forms closure, and reverse osmosis membrane chamber 22 wherein is for comprising the water treatment facilities of second level reverse osmosis membrane.Open hand-operated valve 14,6,7,11,12, and open dense water valve (not shown) in the reverse osmosis membrane chamber 1, turn hand-operated valve 15 down, filter outlet pressure is circulated under 50psi, 20～30 minutes circulation timei, notice that during this time pH changes, pH added hydrochloric acid greater than 2.5 o'clock and is adjusted between 1～2.After time circulation timei arrives, transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.Detect pH, regulate if necessary between pH to 1～2.Press aforesaid operations, wash completely until reverse osmosis membrane system one-level acid, close all hand-operated valves.
Then, carry out the cleaning of two-pass reverse osmosis film: open hand-operated valve 14,8,9,11,12, and open dense water valve (not shown) in the reverse osmosis membrane chamber 2, turn hand-operated valve 15 down, filter outlet pressure is circulated under 50psi, 20～30 minutes circulation timei, during notice that pH changes, pH added hydrochloric acid greater than 2.5 o'clock and is adjusted between 1～2.After time circulation timei arrives, transfer big hand-operated valve 15 to be standard-sized sheet, close hand-operated valve 11.Detect pH, regulate if necessary between pH to 1～2, press aforesaid operations, wash complete until reverse osmosis membrane system secondary acid.Confirm that hand-operated valve 1 to the hand-operated valve of hand-operated valve 15 is closed condition.
At last, adopt water to clean described reverse osmosis membrane: to bleed off the cleaning fluid of 19 li in Chemical Cleaning for Reverse Osmosis jar, open hand-operated valve 14 and fill deionized water, open hand-operated valve 15, open scavenging pump 18 and circulate.
The online chemical cleaning method of reverse osmosis membrane that adopts present embodiment to provide, be used alternatingly acid reverse osmosis membrane cleaning agent of the present invention and alkaline reverse osmosis membrane cleaning agent reverse osmosis membrane is carried out on-line cleaning, simply, effectively and can access tangible cleaning performance, in operating process, simple to operate and mostly be repetitive operation, easily grasp, also need not high-intensity operation, and, the pH value of major control cleaning agent in the cleaning process, suitably control scavenging period and temperature, parameter is simple and easy to control.
Though the present invention discloses as above with preferred embodiment, the present invention is defined in this.Any those skilled in the art without departing from the spirit and scope of the present invention, all can do various changes and modification, so protection scope of the present invention should be as the criterion with claim institute restricted portion.
Claims (10)
1. an alkaline reverse osmosis membrane cleaning agent is characterized in that, comprising:
Concentration is 1～4% tetrasodium salt of EDTA or detergent alkylate semi-annular jade pendant acid sodium or sodium tripolyphosphate solution, and the pH of described solution is 10～12.
2. according to the described alkaline reverse osmosis membrane cleaning agent of claim 1, it is characterized in that the concentration of described tetrasodium salt of EDTA or detergent alkylate semi-annular jade pendant acid sodium or sodium tripolyphosphate solution is 2～3%.
3. according to the described alkaline reverse osmosis membrane cleaning agent of claim 1, it is characterized in that the pH value of described solution is 11～12.
4. according to the described alkaline reverse osmosis membrane cleaning agent of claim 1, it is characterized in that the reagent that the pH value of described alkaline reverse osmosis membrane cleaning agent is adjusted between 11～12 is NaOH or potassium hydroxide.
5. online chemical cleaning method of reverse osmosis membrane is characterized in that: be used alternatingly that each described alkaline reverse osmosis membrane cleaning agent carries out online Chemical cleaning to reverse osmosis membrane in acid reverse osmosis membrane cleaning agent and the claim 1～4.
6. according to the online chemical cleaning method of the described reverse osmosis membrane of claim 5, it is characterized in that, be used alternatingly acid reverse osmosis membrane cleaning agent twice and described alkaline reverse osmosis membrane cleaning agent carries out online Chemical cleaning to reverse osmosis membrane.
7. according to the online chemical cleaning method of the described reverse osmosis membrane of claim 5, it is characterized in that, comprising:
Use acid reverse osmosis membrane cleaning agent to carry out online Chemical cleaning;
Use the described alkaline reverse osmosis membrane cleaning agent of claim 1～4 to carry out online to reverse osmosis membrane
Chemical cleaning;
Using pH is that 11～12 NaOH or potassium hydroxide solution carry out online soaking and washing;
Using pH is that 1～2 hydrochloric acid or salpeter solution carry out online soaking and washing, described hydrochloric acid or
Also contain bactericide in person's salpeter solution.
8. according to the online chemical cleaning method of the described reverse osmosis membrane of claim 5, it is characterized in that described acid reverse osmosis membrane cleaning agent is that concentration is 1～4% Citric Acid Mono or oxalic acid or phosphoric acid solution, pH is 1～4.
9. the online chemical cleaning method of described according to Claim 8 reverse osmosis membrane is characterized in that, described acid reverse osmosis membrane cleaning agent is that concentration is 2～3% Citric Acid Mono or oxalic acid or phosphoric acid solution, and pH is 2～3.
10. according to the online chemical cleaning method of the described reverse osmosis membrane of claim 5, it is characterized in that the temperature of on-line cleaning is 30～35 degrees centigrade.
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| CNA2007100945364A CN101455931A (en) | 2007-12-13 | 2007-12-13 | Reverse osmosis membrane on-line chemical cleaning method and cleaning agent |
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| CNA2007100945364A CN101455931A (en) | 2007-12-13 | 2007-12-13 | Reverse osmosis membrane on-line chemical cleaning method and cleaning agent |
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| CN101455931A true CN101455931A (en) | 2009-06-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102285705A (en) * | 2010-06-21 | 2011-12-21 | 中国石油化工股份有限公司 | Method for cleaning reverse osmosis system |
| CN102489160A (en) * | 2011-12-10 | 2012-06-13 | 安徽环球药业股份有限公司 | Cleaning method for calcium scale of reverse osmosis membrane |
| CN103657425A (en) * | 2013-11-29 | 2014-03-26 | 北京碧水源膜科技有限公司 | Method for recycling waste polyamide roll type reverse-osmosis membrane elements |
| CN105709605A (en) * | 2015-08-13 | 2016-06-29 | 常州联江环保科技有限公司 | Alkaline cleaning agent and bactericide applicable to ultra-filtration membranes or reverse osmosis membranes |
| CN106237864A (en) * | 2016-08-01 | 2016-12-21 | 西安合瑞环境工程有限公司 | A kind of reverse osmosis membrane cleaning agent and using method thereof |
| CN107185410A (en) * | 2017-06-02 | 2017-09-22 | 青岛百发海水淡化有限公司 | A kind of cleaning method of desalinization reverse osmosis membrane |
| CN109289538A (en) * | 2017-07-25 | 2019-02-01 | 中国石油化工股份有限公司 | A kind of method of in-site chemical cleaning reverse osmosis membrane |
| CN110559861A (en) * | 2019-08-22 | 2019-12-13 | 唐山三友远达纤维有限公司 | Continuous membrane treatment method for alkali squeezing liquid in viscose fiber production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102285705A (en) * | 2010-06-21 | 2011-12-21 | 中国石油化工股份有限公司 | Method for cleaning reverse osmosis system |
| CN102285705B (en) * | 2010-06-21 | 2014-07-23 | 中国石油化工股份有限公司 | Method for cleaning reverse osmosis system |
| CN102489160A (en) * | 2011-12-10 | 2012-06-13 | 安徽环球药业股份有限公司 | Cleaning method for calcium scale of reverse osmosis membrane |
| CN103657425A (en) * | 2013-11-29 | 2014-03-26 | 北京碧水源膜科技有限公司 | Method for recycling waste polyamide roll type reverse-osmosis membrane elements |
| CN103657425B (en) * | 2013-11-29 | 2016-08-17 | 北京碧水源膜科技有限公司 | A kind of recovery method of waste and old polyamide-based coiled reverse osmosis membrane element |
| CN105709605A (en) * | 2015-08-13 | 2016-06-29 | 常州联江环保科技有限公司 | Alkaline cleaning agent and bactericide applicable to ultra-filtration membranes or reverse osmosis membranes |
| CN106237864A (en) * | 2016-08-01 | 2016-12-21 | 西安合瑞环境工程有限公司 | A kind of reverse osmosis membrane cleaning agent and using method thereof |
| CN107185410A (en) * | 2017-06-02 | 2017-09-22 | 青岛百发海水淡化有限公司 | A kind of cleaning method of desalinization reverse osmosis membrane |
| CN109289538A (en) * | 2017-07-25 | 2019-02-01 | 中国石油化工股份有限公司 | A kind of method of in-site chemical cleaning reverse osmosis membrane |
| CN110559861A (en) * | 2019-08-22 | 2019-12-13 | 唐山三友远达纤维有限公司 | Continuous membrane treatment method for alkali squeezing liquid in viscose fiber production process |
| CN110559861B (en) * | 2019-08-22 | 2022-01-11 | 唐山三友远达纤维有限公司 | Continuous membrane treatment method for alkali squeezing liquid in viscose fiber production process |
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