CN113648837A - Method for cleaning highly-polluted reverse osmosis membrane - Google Patents
Method for cleaning highly-polluted reverse osmosis membrane Download PDFInfo
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- CN113648837A CN113648837A CN202110836731.XA CN202110836731A CN113648837A CN 113648837 A CN113648837 A CN 113648837A CN 202110836731 A CN202110836731 A CN 202110836731A CN 113648837 A CN113648837 A CN 113648837A
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- 239000012528 membrane Substances 0.000 title claims abstract description 176
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 173
- 238000004140 cleaning Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 161
- 238000011001 backwashing Methods 0.000 claims abstract description 54
- 238000005406 washing Methods 0.000 claims abstract description 45
- 238000002791 soaking Methods 0.000 claims abstract description 42
- 239000002253 acid Substances 0.000 claims abstract description 37
- 238000005086 pumping Methods 0.000 claims abstract description 37
- 239000012459 cleaning agent Substances 0.000 claims abstract description 31
- 239000003513 alkali Substances 0.000 claims abstract description 30
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 26
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000007864 aqueous solution Substances 0.000 claims abstract description 25
- 239000000243 solution Substances 0.000 claims abstract description 22
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000009210 therapy by ultrasound Methods 0.000 claims description 12
- 239000006260 foam Substances 0.000 claims description 6
- 239000002101 nanobubble Substances 0.000 claims description 5
- 239000000356 contaminant Substances 0.000 claims 1
- 230000000249 desinfective effect Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 24
- 238000005554 pickling Methods 0.000 description 10
- 239000000084 colloidal system Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 230000003204 osmotic effect Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B01D65/022—Membrane sterilisation
-
- 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
- B01D2321/04—Backflushing
-
- 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
-
- 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
- B01D2321/164—Use of bases
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a method for cleaning a highly polluted reverse osmosis membrane, which comprises the following steps: soaking: putting a reverse osmosis membrane to be treated into a soaking box, and injecting pure water into the soaking box to ensure that the pure water overflows the reverse osmosis membrane and is soaked for a certain time; high-pressure pure water backwashing: taking out the soaked reverse osmosis membrane, and continuously injecting high-pressure pure water into the reverse osmosis membrane by using a backwashing water pump for backwashing; cleaning with a cleaning agent: and pumping the cleaning agent solution into the reverse osmosis membrane by using a water pump for circular cleaning. The invention can greatly increase the cleaning effect of the reverse osmosis membrane, can utilize the sodium hypochlorite aqueous solution to disinfect the reverse osmosis membrane, and can independently carry out pure water washing after cleaning by using a cleaning agent, acid washing, alkali washing and disinfection, thereby not only removing the cleaning residual liquid in the reverse osmosis membrane, but also effectively preventing the chemical reaction between the cleaning residual liquid from damaging the interior of the reverse osmosis membrane.
Description
Technical Field
The invention relates to the technical field of reverse osmosis membrane cleaning, in particular to a method for cleaning a high-pollution reverse osmosis membrane.
Background
The reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics and is made by simulating a biological semipermeable membrane, and is a core component of a reverse osmosis technology. The principle of reverse osmosis is that under the action of the osmotic pressure higher than that of the solution, other substances are separated from water based on the fact that the substances cannot permeate a semipermeable membrane. The reverse osmosis membrane has a very small membrane pore size, and thus can effectively remove dissolved salts, colloids, microorganisms, organic substances, and the like in water. The system has the advantages of good water quality, low energy consumption, no pollution, simple process, simple and convenient operation and the like.
Reverse osmosis units play a central role in sewage treatment systems. Reverse osmosis membranes are a key element in reverse osmosis units. In the using process, the membrane elements are polluted to different degrees, such as granular pollution of silt and the like, and in most cases, the membrane elements are polluted compositely. After membrane fouling, osmotic pressure will increase, osmotic efficiency will decrease, water production will decrease, and salt rejection will decrease. Therefore, it is necessary to clean the reverse osmosis membrane in time to allow the membrane to operate more efficiently and durably.
In the sewage, a large amount of colloids, microorganisms and organic matters are usually contained, and the pollutants are retained in a reverse osmosis membrane, and the common cleaning method in the prior art is as follows: the reverse osmosis membrane is cleaned by adopting acid liquor and alkali liquor with certain concentration and proportion respectively, the cleaning method is chemical cleaning, the cleaning effect is general, colloid and microorganisms cannot be thoroughly cleaned, the reverse osmosis membrane cannot be disinfected, and the cleaned reverse osmosis membrane contains a large amount of cleaning residual liquor.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The invention aims to provide a method for cleaning a highly polluted reverse osmosis membrane so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for cleaning a highly polluted reverse osmosis membrane comprises the following steps:
step S101, soaking: putting a reverse osmosis membrane to be treated into a soaking box, and injecting pure water into the soaking box to ensure that the pure water overflows the reverse osmosis membrane and is soaked for a certain time;
step S103, high-pressure pure water backwashing: taking out the soaked reverse osmosis membrane, and continuously injecting high-pressure pure water into the reverse osmosis membrane by using a backwashing water pump for backwashing;
step S105, cleaning by using a cleaning agent: pumping the cleaning agent solution into the reverse osmosis membrane by using a water pump for circular cleaning;
step S107, backwashing with pure water: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the residual liquid of the cleaning agent in the reverse osmosis membrane until no foam exists;
step S109, acid washing: cleaning a reverse osmosis membrane in prepared acid liquor, and performing ultrasonic treatment on the acid liquor by using an ultrasonic generator;
step S111, pure water backwashing II: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing acid liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
step S113, alkali washing: putting the reverse osmosis membrane into prepared alkali liquor for cleaning, and carrying out ultrasonic treatment on the alkali liquor by using an ultrasonic generator;
step S115, pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing alkali liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
step S117, disinfection: preparing a sodium hypochlorite aqueous solution, and pumping the prepared sodium hypochlorite aqueous solution into a reverse osmosis membrane by using a water pump to disinfect the interior of the reverse osmosis membrane;
step S119, pure water backwashing: and continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the sodium hypochlorite aqueous solution in the reverse osmosis membrane to be clean.
Further, in the soaking process, the temperature of the injected pure water is 35-40 ℃, and the soaking time is 3-5 hours.
Further, in the soaking process, an ultrasonic generator is used for transmitting ultrasonic waves to the pure water in the soaking box, wherein the power of the ultrasonic transmitter is 90W, and the frequency is 90 KHz.
Further, in the backwashing, when there is no impurity in the water discharged from the reverse osmosis membrane, the operation of the backwashing water pump is stopped.
Furthermore, in the cleaning process of the cleaning agent, micro-nano bubbles are added into the cleaning agent solution pumped into the reverse osmosis membrane.
Further, in the acid washing process, the pH test is carried out on the acid liquor every five minutes, so that the pH of the acid liquor is kept within the range of 2.6-3.2, and the acid washing time is 2-3 hours.
Furthermore, the concentration of the sodium hypochlorite aqueous solution prepared in the disinfection process is 2-3 mg/L.
Compared with the prior art, the invention has the following beneficial effects: can make the pollutant in the reverse osmosis membrane more easily by the backwash through hot water soaking, especially can make the colloid soften more easily by the backwash, and adopt the cleaner to wash in proper order, pickling and alkali wash, the cleaning performance of increase reverse osmosis membrane that can be very big, and can utilize sodium hypochlorite aqueous solution to carry out disinfection treatment to reverse osmosis membrane, and cleaning agent washing is being carried out, the pickling, all carry out the pure water alone after alkali wash and the disinfection and wash, not only can clear away the washing residual liquid in the reverse osmosis membrane, and can effectually prevent to wash and take place chemical reaction between the residual liquid and cause the damage to reverse osmosis membrane inside.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow diagram of a method of cleaning a highly contaminated reverse osmosis membrane in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description:
in accordance with an embodiment of the present invention, a method of cleaning a highly contaminated reverse osmosis membrane is provided.
As shown in figure 1, the method for cleaning the highly polluted reverse osmosis membrane comprises the following steps:
step S101, soaking: putting a reverse osmosis membrane to be treated into a soaking box, and injecting pure water into the soaking box to ensure that the pure water overflows the reverse osmosis membrane and is soaked for a certain time;
step S103, high-pressure pure water backwashing: taking out the soaked reverse osmosis membrane, and continuously injecting high-pressure pure water into the reverse osmosis membrane by using a backwashing water pump for backwashing;
step S105, cleaning by using a cleaning agent: pumping the cleaning agent solution into the reverse osmosis membrane by using a water pump for circular cleaning;
step S107, backwashing with pure water: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the residual liquid of the cleaning agent in the reverse osmosis membrane until no foam exists;
step S109, acid washing: cleaning a reverse osmosis membrane in prepared acid liquor, and performing ultrasonic treatment on the acid liquor by using an ultrasonic generator;
step S111, pure water backwashing II: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing acid liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
step S113, alkali washing: putting the reverse osmosis membrane into prepared alkali liquor for cleaning, and carrying out ultrasonic treatment on the alkali liquor by using an ultrasonic generator;
step S115, pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing alkali liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
step S117, disinfection: preparing a sodium hypochlorite aqueous solution, and pumping the prepared sodium hypochlorite aqueous solution into a reverse osmosis membrane by using a water pump to disinfect the interior of the reverse osmosis membrane;
step S119, pure water backwashing: and continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the sodium hypochlorite aqueous solution in the reverse osmosis membrane to be clean.
In order to clearly understand the technical scheme of the invention, the technical scheme of the invention is described in detail through specific examples.
The first embodiment is as follows:
referring to fig. 1, a method for cleaning a highly polluted reverse osmosis membrane according to an embodiment of the present invention includes the following steps:
soaking: putting a reverse osmosis membrane to be treated into a soaking box, and injecting pure water into the soaking box to ensure that the pure water overflows the reverse osmosis membrane and is soaked for a certain time;
high-pressure pure water backwashing: taking out the soaked reverse osmosis membrane, and continuously injecting high-pressure pure water into the reverse osmosis membrane by using a backwashing water pump for backwashing;
cleaning with a cleaning agent: pumping the cleaning agent solution into the reverse osmosis membrane by using a water pump for circular cleaning;
pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the residual liquid of the cleaning agent in the reverse osmosis membrane until no foam exists;
acid washing: cleaning a reverse osmosis membrane in prepared acid liquor, and performing ultrasonic treatment on the acid liquor by using an ultrasonic generator;
and (2) pure water backwashing II: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing acid liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
alkali washing: putting the reverse osmosis membrane into prepared alkali liquor for cleaning, and carrying out ultrasonic treatment on the alkali liquor by using an ultrasonic generator;
and (3) pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing alkali liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
and (3) disinfection: preparing a sodium hypochlorite aqueous solution, and pumping the prepared sodium hypochlorite aqueous solution into a reverse osmosis membrane by using a water pump to disinfect the interior of the reverse osmosis membrane;
and D, pure water backwashing: and continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the sodium hypochlorite aqueous solution in the reverse osmosis membrane to be clean.
Wherein, in the soaking process, the temperature of the injected pure water is 35 ℃, and the soaking time is 3 hours;
in the soaking process, an ultrasonic generator is utilized to emit ultrasonic waves to the pure water in the soaking box, wherein the power of the ultrasonic emitter is 90W, and the frequency is 90 KHz;
in the backwashing process, when no impurity exists in the water discharged from the reverse osmosis membrane, the operation of the backwashing water pump can be stopped;
in the cleaning process of the cleaning agent, micro-nano bubbles are added into the cleaning agent solution pumped into the reverse osmosis membrane;
in the pickling process, performing a pH test on the acid solution every five minutes to keep the pH of the acid solution within a range of 2.6-3.2, wherein the pickling time is 2 hours;
the concentration of the sodium hypochlorite aqueous solution prepared in the disinfection process is 2 mg/L.
Example two:
referring to fig. 1, a method for cleaning a highly polluted reverse osmosis membrane according to an embodiment of the present invention includes the following steps:
soaking: putting a reverse osmosis membrane to be treated into a soaking box, and injecting pure water into the soaking box to ensure that the pure water overflows the reverse osmosis membrane and is soaked for a certain time;
high-pressure pure water backwashing: taking out the soaked reverse osmosis membrane, and continuously injecting high-pressure pure water into the reverse osmosis membrane by using a backwashing water pump for backwashing;
cleaning with a cleaning agent: pumping the cleaning agent solution into the reverse osmosis membrane by using a water pump for circular cleaning;
pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the residual liquid of the cleaning agent in the reverse osmosis membrane until no foam exists;
acid washing: cleaning a reverse osmosis membrane in prepared acid liquor, and performing ultrasonic treatment on the acid liquor by using an ultrasonic generator;
and (2) pure water backwashing II: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing acid liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
alkali washing: putting the reverse osmosis membrane into prepared alkali liquor for cleaning, and carrying out ultrasonic treatment on the alkali liquor by using an ultrasonic generator;
and (3) pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing alkali liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
and (3) disinfection: preparing a sodium hypochlorite aqueous solution, and pumping the prepared sodium hypochlorite aqueous solution into a reverse osmosis membrane by using a water pump to disinfect the interior of the reverse osmosis membrane;
and D, pure water backwashing: and continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the sodium hypochlorite aqueous solution in the reverse osmosis membrane to be clean.
Wherein, in the soaking process, the temperature of the injected pure water is 37.5 ℃, and the soaking time is 4 hours;
in the soaking process, an ultrasonic generator is utilized to emit ultrasonic waves to the pure water in the soaking box, wherein the power of the ultrasonic emitter is 90W, and the frequency is 90 KHz;
in the backwashing process, when no impurity exists in the water discharged from the reverse osmosis membrane, the operation of the backwashing water pump can be stopped;
in the cleaning process of the cleaning agent, micro-nano bubbles are added into the cleaning agent solution pumped into the reverse osmosis membrane;
in the pickling process, performing a pH test on the acid solution every five minutes to keep the pH of the acid solution within the range of 2.6-3.2, wherein the pickling time is 2.5 hours;
the concentration of the sodium hypochlorite aqueous solution prepared in the disinfection process is 2.5 mg/L.
Example three:
referring to fig. 1, a method for cleaning a highly polluted reverse osmosis membrane according to an embodiment of the present invention includes the following steps:
soaking: putting a reverse osmosis membrane to be treated into a soaking box, and injecting pure water into the soaking box to ensure that the pure water overflows the reverse osmosis membrane and is soaked for a certain time;
high-pressure pure water backwashing: taking out the soaked reverse osmosis membrane, and continuously injecting high-pressure pure water into the reverse osmosis membrane by using a backwashing water pump for backwashing;
cleaning with a cleaning agent: pumping the cleaning agent solution into the reverse osmosis membrane by using a water pump for circular cleaning;
pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the residual liquid of the cleaning agent in the reverse osmosis membrane until no foam exists;
acid washing: cleaning a reverse osmosis membrane in prepared acid liquor, and performing ultrasonic treatment on the acid liquor by using an ultrasonic generator;
and (2) pure water backwashing II: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing acid liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
alkali washing: putting the reverse osmosis membrane into prepared alkali liquor for cleaning, and carrying out ultrasonic treatment on the alkali liquor by using an ultrasonic generator;
and (3) pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing alkali liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
and (3) disinfection: preparing a sodium hypochlorite aqueous solution, and pumping the prepared sodium hypochlorite aqueous solution into a reverse osmosis membrane by using a water pump to disinfect the interior of the reverse osmosis membrane;
and D, pure water backwashing: and continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the sodium hypochlorite aqueous solution in the reverse osmosis membrane to be clean.
Wherein, in the soaking process, the temperature of the injected pure water is 40 ℃, and the soaking time is 5 hours;
in the soaking process, an ultrasonic generator is utilized to emit ultrasonic waves to the pure water in the soaking box, wherein the power of the ultrasonic emitter is 90W, and the frequency is 90 KHz;
in the backwashing process, when no impurity exists in the water discharged from the reverse osmosis membrane, the operation of the backwashing water pump can be stopped;
in the cleaning process of the cleaning agent, micro-nano bubbles are added into the cleaning agent solution pumped into the reverse osmosis membrane;
in the pickling process, performing a pH test on the acid solution every five minutes to keep the pH of the acid solution within 3.2, wherein the pickling time is 3 hours;
the concentration of the sodium hypochlorite aqueous solution prepared in the disinfection process is 3 mg/L.
Through the scheme of the invention, the invention has the following beneficial effects: can make the pollutant in the reverse osmosis membrane more easily by the backwash through hot water soaking, especially can make the colloid soften more easily by the backwash, and adopt the cleaner to wash in proper order, pickling and alkali wash, the cleaning performance of increase reverse osmosis membrane that can be very big, and can utilize sodium hypochlorite aqueous solution to carry out disinfection treatment to reverse osmosis membrane, and cleaning agent washing is being carried out, the pickling, all carry out the pure water alone after alkali wash and the disinfection and wash, not only can clear away the washing residual liquid in the reverse osmosis membrane, and can effectually prevent to wash and take place chemical reaction between the residual liquid and cause the damage to reverse osmosis membrane inside.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for cleaning a highly polluted reverse osmosis membrane is characterized by comprising the following steps:
step S101, soaking: putting a reverse osmosis membrane to be treated into a soaking box, and injecting pure water into the soaking box to ensure that the pure water overflows the reverse osmosis membrane and is soaked for a certain time;
step S103, high-pressure pure water backwashing: taking out the soaked reverse osmosis membrane, and continuously injecting high-pressure pure water into the reverse osmosis membrane by using a backwashing water pump for backwashing;
step S105, cleaning by using a cleaning agent: pumping the cleaning agent solution into the reverse osmosis membrane by using a water pump for circular cleaning;
step S107, backwashing with pure water: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the residual liquid of the cleaning agent in the reverse osmosis membrane until no foam exists;
step S109, acid washing: cleaning a reverse osmosis membrane in prepared acid liquor, and performing ultrasonic treatment on the acid liquor by using an ultrasonic generator;
step S111, pure water backwashing II: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing acid liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
step S113, alkali washing: putting the reverse osmosis membrane into prepared alkali liquor for cleaning, and carrying out ultrasonic treatment on the alkali liquor by using an ultrasonic generator;
step S115, pure water backwashing: continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing alkali liquor in the reverse osmosis membrane until the pH value of discharged water of the reverse osmosis membrane is within the range of 6-7;
step S117, disinfection: preparing a sodium hypochlorite aqueous solution, and pumping the prepared sodium hypochlorite aqueous solution into a reverse osmosis membrane by using a water pump to disinfect the interior of the reverse osmosis membrane;
step S119, pure water backwashing: and continuously pumping pure water into the reverse osmosis membrane by using a water pump, and washing the sodium hypochlorite aqueous solution in the reverse osmosis membrane to be clean.
2. The method of cleaning a highly contaminated reverse osmosis membrane according to claim 1 wherein said soaking with pure water is carried out at a temperature of 35 to 40 ℃ for a period of 3 to 5 hours.
3. The method of cleaning a highly contaminated reverse osmosis membrane according to claim 2 wherein said soaking step is performed by using an ultrasonic generator to generate ultrasonic waves in the pure water in the soaking tank, wherein the ultrasonic generator has a power of 90W and a frequency of 90 KHz.
4. The method of cleaning a highly contaminated reverse osmosis membrane according to claim 1 wherein during said backwashing operation said backwash water pump is stopped when there is no contaminant in the water exiting said reverse osmosis membrane.
5. The method of claim 1 wherein micro-nano bubbles are added to the cleaner solution pumped into the reverse osmosis membrane during said cleaning with the cleaner.
6. The method of cleaning a highly contaminated reverse osmosis membrane according to claim 1 wherein said acid wash is performed at a PH test of 2.6 to 3.2 every five minutes for a period of 2 to 3 hours.
7. The method of claim 1 wherein the concentration of the aqueous sodium hypochlorite solution provided during said disinfecting is 2-3 mg/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115178100A (en) * | 2022-07-12 | 2022-10-14 | 星达（泰州）膜科技有限公司 | PVDF ultrafiltration membrane cleaning method |
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