CN219784379U - Reverse osmosis membrane cleaning system - Google Patents
Reverse osmosis membrane cleaning system Download PDFInfo
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- CN219784379U CN219784379U CN202320998679.2U CN202320998679U CN219784379U CN 219784379 U CN219784379 U CN 219784379U CN 202320998679 U CN202320998679 U CN 202320998679U CN 219784379 U CN219784379 U CN 219784379U
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- osmosis membrane
- acid
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- 239000012528 membrane Substances 0.000 title claims abstract description 74
- 238000004140 cleaning Methods 0.000 title claims abstract description 61
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000007788 liquid Substances 0.000 claims abstract description 71
- 230000000694 effects Effects 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims description 80
- 239000002253 acid Substances 0.000 claims description 61
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 239000004576 sand Substances 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 12
- 238000006386 neutralization reaction Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 abstract description 66
- 239000000126 substance Substances 0.000 abstract description 13
- 230000009471 action Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 5
- 238000010008 shearing Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 14
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 6
- 235000006408 oxalic acid Nutrition 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model provides a reverse osmosis membrane cleaning system, which converts cleaning solution into dissolved gas cleaning solution by arranging a dissolved gas tank, an air pump, a gas-liquid mixer and a nozzle, cleans a reverse osmosis membrane component, increases the shearing force and the fluid flow velocity of the surface of a membrane by utilizing the hydraulic action of gas, strengthens the turbulence degree in a flow channel, and loosens a pollution layer on the surface of the membrane, thereby strengthening the cleaning effect and improving the cleaning efficiency of the membrane. The system of the utility model has good washing effect by arranging the dissolved air tank, the gas-liquid mixer and the nozzle on the premise of using the conventional chemical washing liquid and the washing water pressure, and overcomes the defects of financial resources and time consumption and film damage affecting the service life of the film caused by the conventional chemical washing mode for cleaning the reverse osmosis film.
Description
Technical Field
The utility model relates to the technical field of reverse osmosis membrane cleaning, in particular to a reverse osmosis membrane cleaning system.
Background
Reverse osmosis technology is a pressure driven membrane separation technology developed in the 60 s of the 20 th century, and basically belongs to a physical method. Along with the continuous development of membrane technology and the increasing shortage of water resources, the reverse osmosis technology is increasingly widely applied in the water treatment industry, and RO (Reverse Osmosis) is used for producing desalted water and drinking water, is also used in the fields of wastewater treatment, material recovery, concentration and the like, and is also used in the industries of electric power, chemical industry, petroleum, beverage, pharmacy, electronics and the like. Reverse osmosis technology is successfully used in a variety of fields, largely due to its simplicity of operation and economy of operation.
In the practical application process of reverse osmosis membrane separation technology, the membrane pollution problem is a decisive factor influencing the reliability of the technology. The membrane pollution not only worsens the water quality of produced water, reduces the water yield and increases the pressure drop of the system, but also increases the energy consumption, and the cost of medicines for cleaning the membrane is increased, and the membrane can be irreversibly damaged, so that the service life of the membrane is shortened, and the economy of the reverse osmosis technology is influenced to a certain extent.
The prior cleaning modes for reverse osmosis membrane pollution comprise mechanical cleaning, namely clear water flushing, chemical cleaning and biological enzyme cleaning, wherein the most used mode is chemical cleaning, and the chemical cleaning mainly comprises alkaline cleaning and acid cleaning, but the essence of the prior chemical cleaning mode is that the prior method obtains better cleaning effect by the chemical reaction action of chemical reagents and dirt and the mechanical scouring action of cleaning liquid, and the prior method either improves the concentration of the chemical reagents, develops novel chemical reagents or improves the pressure and the flushing time of the cleaning liquid. However, increasing the concentration of the chemical agent inevitably causes membrane damage, developing new chemical agents consumes financial resources and time, and increasing the pressure and the rinsing time of the washing liquid also causes membrane damage to affect the life of the membrane.
Therefore, the new and proper reverse osmosis membrane cleaning technology is researched and developed, so that the permeation flux and the desalination rate can be greatly recovered, the service life of the membrane is prolonged, the membrane is not damaged, the cleaning cost can be saved, and the reverse osmosis membrane cleaning technology has important significance for the normal operation of a reverse osmosis device.
Disclosure of Invention
The utility model provides a reverse osmosis membrane cleaning system, which is used for solving the problems of financial resources and time consumption and influence on membrane service life caused by membrane damage caused by cleaning of a reverse osmosis membrane by the conventional chemical cleaning method.
The utility model provides a reverse osmosis membrane cleaning system which comprises a dissolved air tank, a liquid storage tank, a circulating pump, a heat exchanger, a membrane component, a buffer tank and a filter which are sequentially connected in series;
the top of the dissolved air tank is provided with a gas-liquid mixer, and the gas-liquid mixer is connected with an air pump through a first air valve; the air pump is connected with the dissolved air tank through a second air valve; the output end of the gas-liquid mixer is arranged in the dissolved air tank; the dissolved air tank is connected with the liquid storage tank through a nozzle;
the gas-liquid mixer is also connected with the alkali liquor pool through an alkali outlet valve; the gas-liquid mixer is also connected with the acid liquor pool through an acid outlet valve; the gas-liquid mixer is also connected with a clean water tank through a water outlet valve;
the filter is connected with the alkali liquor pool through an alkali inlet valve, connected with the acid liquor pool through an acid inlet valve and connected with the clean water pool through an water inlet valve;
the dissolved air tank is also provided with a pressure gauge, and the buffer tank is also provided with a pH gauge.
Optionally, a sand filter is provided between the buffer reservoir and the filter.
Optionally, the alkali liquid pool and the acid liquid pool are connected with a neutralization pool, and the neutralization pool and the clean water pool are connected with an evaporator.
Optionally, the nozzle is one of a hollow cone nozzle, a solid cone nozzle, a square nozzle and an oval nozzle.
Alternatively, the evaporator is a triple effect MVR evaporator.
Optionally, the heat exchanger is a tube heat exchanger or a plate heat exchanger.
Optionally, the sand filter is filled with quartz sand or manganese sand with the particle size of 0.1-0.5 cm.
According to the reverse osmosis membrane cleaning system provided by the utility model, the dissolved air tank, the air pump, the gas-liquid mixer and the nozzle are arranged, so that the cleaning liquid is converted into dissolved air cleaning liquid, the reverse osmosis membrane component is cleaned, the shearing force and the fluid flow velocity of the surface of the membrane are increased by utilizing the hydraulic action of the gas, the turbulence degree in the flow channel is enhanced, and the pollution layer on the surface of the membrane is loosened, so that the cleaning effect is enhanced, and the cleaning efficiency of the membrane is improved. The system of the utility model has good washing effect by arranging the dissolved air tank, the gas-liquid mixer and the nozzle on the premise of using the conventional chemical washing liquid and the washing water pressure, and overcomes the defects of financial resources and time consumption and film damage affecting the service life of the film caused by the conventional chemical washing mode for cleaning the reverse osmosis film.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a reverse osmosis membrane cleaning system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a reverse osmosis membrane cleaning system according to another embodiment of the present utility model;
fig. 3 is a schematic diagram of a reverse osmosis membrane cleaning system according to another embodiment of the present utility model.
Reference numerals illustrate:
1. a dissolved air tank;
2. a liquid storage pool;
3. a heat exchanger;
4. a membrane module;
5. a buffer pool;
6. a filter;
7. an alkali liquid pool;
8. an acid liquid pool;
9. a clean water tank;
10. an air pump;
11. a second air valve;
12. a first air valve;
13. a gas-liquid mixer;
14. a pressure gauge;
21. a nozzle;
22. a circulation pump;
51. a pH meter;
71. an alkali outlet valve;
72. an alkali inlet valve;
81. an acid outlet valve;
82. an acid inlet valve;
91. a water outlet valve;
92. an alkali inlet valve;
100. a sand filter;
200. an evaporator.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are also within the scope of the utility model.
As shown in fig. 1, the utility model provides a reverse osmosis membrane cleaning system, which comprises a dissolved air tank 1, a liquid storage tank 2, a circulating pump 22, a heat exchanger 3, a membrane component 4, a buffer tank 5 and a filter 6 which are sequentially connected in series;
the top of the dissolved air tank 1 is provided with a gas-liquid mixer 13, and the gas-liquid mixer 13 is connected with an air pump 10 through a first air valve 12; the air pump 10 is connected with the dissolved air tank 1 through a second air valve 11; the output end of the gas-liquid mixer 13 is arranged in the dissolved air tank 1; the dissolved air tank 1 is connected with the liquid storage tank 2 through a nozzle 21;
the gas-liquid mixer 13 is also connected with the alkali liquor tank 7 through an alkali outlet valve 71; the gas-liquid mixer 13 is also connected with the acid liquid pool 8 through an acid outlet valve 81; the gas-liquid mixer 13 is also connected with the clean water tank 9 through a water outlet valve 91;
the filter 6 is connected with the alkali liquor pool 7 through an alkali inlet valve 72, is connected with the acid liquor pool 8 through an acid inlet valve 82, and is connected with the clean water pool 9 through a water inlet valve 92;
the dissolved air tank 1 is also provided with a pressure gauge 14, and the buffer tank 5 is also provided with a pH gauge 51.
In the utility model, the dissolved air tank 1, the air pump 10, the air-liquid mixer 13 and the nozzle 21 are arranged to obtain a dissolved air washing liquid (water, acid or alkali liquor), the dissolved air washing liquid (water, acid or alkali liquor) is utilized, namely, the air-liquid mixture is used for washing the reverse osmosis membrane, and in the process of cleaning the membrane by the air-liquid two-phase flow, the shearing force and the fluid flow velocity of the surface of the membrane are increased due to the hydraulic action of the air, so that the turbulence in a flow channel is enhanced, the pollution layer on the surface of the membrane is loosened, the cleaning effect is enhanced, and the cleaning efficiency of the membrane is improved.
When the alkaline washing process is carried out, the acid outlet valve 81, the acid inlet valve 82, the water outlet valve 91, the water inlet valve 92 and the second air valve 11 are closed, the alkali outlet valve 71, the alkali inlet valve 72 and the air pump 10 are opened, alkali liquor (such as sodium hydroxide aqueous solution with pH of 10-11 serving as washing liquid) in the alkali liquor tank 7 enters the air-liquid mixer 13 through the alkali outlet valve 71, compressed air output by the air pump 10 is mixed in the air-liquid mixer 13 and sprayed into the dissolved air tank 1 to form supersaturated dissolved air water, when the liquid level in the dissolved air tank 1 reaches a preset value (such as 0.6-0.8 of the volume of the dissolved air tank 1), the second air valve 11 is opened, the pressure in the dissolved air tank 1 is observed through the pressure gauge 14, when the pressure in the dissolved air tank 1 reaches a certain value (such as 0.7 MPa), the dissolved air tank 1 and the nozzle 21 are communicated, spraying the alkali liquor in the solution tank 1 into the liquid storage tank 2, wherein a large amount of tiny bubbles, namely the dissolved gas alkali liquor, are enriched in water in the liquid storage tank 2, transferring the dissolved gas alkali liquor into the heat exchanger 3 through the circulating pump 22, heating to 25-30 ℃, inputting the heated dissolved gas alkali liquor into the membrane module 4, washing the membrane module, flowing the washed alkali liquor flowing out of the membrane module 4 into the buffer tank 5, filtering and intercepting the alkali liquor by the filter 6, inputting the filtered and intercepted alkali liquor into the alkali liquor tank 7 through the alkali inlet valve 72, carrying out the next circulation, when the pH meter 51 in the buffer tank 5 detects that the pH value of the alkali liquor in the buffer tank is reduced (for example, the pH value is lower than 10), the staff can add high-concentration alkali liquor (for example, 20%wt sodium hydroxide aqueous solution) into the alkali liquor tank 7 to maintain the alkalinity of the alkali liquor, and when the pH meter 51 detects that the pH value of the alkali liquor in the buffer tank 5 is kept unchanged for a certain time (for example, within 10-15 min), and (5) recirculating washing for 5-15 min, ending the alkaline washing process, and washing with water.
When the water washing process is performed, the alkali outlet valve 71, the acid outlet valve 81, the acid inlet valve 82, the water inlet valve 92 and the second air valve 11 are closed, and the water outlet valve 91, the water inlet valve 92 and the air pump 10 are opened, and the water washing process and the alkali washing process are not described in detail, and it is noted that the water output from the membrane module 4 in the water washing process is returned to the alkali pond through the alkali inlet valve 72. When the pH meter 51 detects that the pH value of the alkaline solution in the buffer tank 5 is neutral and is unchanged for a period of time (such as 10-15 min) in the water washing process, the water washing is finished. Acid washing is carried out.
In the pickling process, the alkali outlet valve 71, the alkali inlet valve 72, the water outlet valve 91, the water inlet valve 92 and the second air valve 11 are closed, and the acid outlet valve 81, the acid inlet valve 82 and the air pump 10 are opened, so that the pickling process is the same as the alkali washing process, and the details are not repeated here. The aqueous solution of citric acid or oxalic acid having a pH of 2 to 3 is stored in the acid tank 8 as a washing liquid. When the pH meter 51 in the buffer tank 5 detects that the pH value of the acid solution in the buffer tank 5 is raised (for example, the pH is higher than 3), a worker can add a high-concentration acid solution (for example, saturated citric acid or oxalic acid aqueous solution) into the acid solution tank to maintain the acidity of the acid solution, and when the pH meter 51 detects that the pH value of the acid solution in the buffer tank is kept unchanged for a certain time (for example, within 10-15 min), the recirculation washing is performed for 5-15 min, and the acid washing process is ended, so that the water washing is performed.
It should be noted that the above-mentioned order of alkali washing and acid washing may be arranged according to the actual condition of the factory, but it is necessary to wash with water before another washing is performed, whether acid washing is performed first or alkali washing is performed first.
According to the reverse osmosis membrane cleaning system, the cleaning solution is converted into the dissolved gas cleaning solution by arranging the dissolved gas tank 1, the air pump 10, the gas-liquid mixer 13 and the nozzle 21, the reverse osmosis membrane assembly 4 is cleaned, the shearing force and the fluid flow velocity of the membrane surface are increased by utilizing the hydraulic action of gas, the turbulence degree in the flow channel is enhanced, and the pollution layer on the membrane surface is loosened, so that the cleaning effect is enhanced, and the cleaning efficiency of the membrane is improved. The system of the utility model has the advantages that the system has good washing effect by arranging the dissolved air tank 1, the gas-liquid mixer 13 and the nozzle 21 on the premise of using the conventional chemical washing liquid and the washing water pressure, and overcomes the defects of financial resources and time consumption and film damage affecting the service life of the film caused by the conventional chemical washing mode for cleaning the reverse osmosis film.
Optionally, as shown in fig. 2, a sand filter 100 is provided between the buffer tank 5 and the filter 6.
In the utility model, the sand filter 100 is used for preliminarily filtering the cleaned cleaning fluid output by the reverse osmosis membrane module 4 to reduce the turbidity thereof, thereby reducing the filtering burden of the filter 6 and prolonging the service life of the filter 6.
Alternatively, as shown in FIG. 3, the lye tank 7 and the acid tank 8 are connected to a neutralization tank 20, and both the neutralization tank 20 and the clean water tank 9 are connected to an evaporator 200.
In the utility model, because the washing liquid in the alkali liquor pool 7 and the acid liquor pool 8 can be dirty at first and the salt content in the washing liquid can be raised at second because the washing liquid in the alkali liquor pool 7 and the acid liquor pool 8 are used for multiple times, when the washing liquid in the alkali liquor pool 7 and the acid liquor pool 8 can not reach the washing standard, the alkali liquor in the alkali liquor pool 7 and the acid liquor in the acid liquor pool 8 are input into the neutralization pool 20 for neutralization, the neutralized washing liquid is transferred into the evaporator 200 for evaporation and concentration, the salt content and the water content in the washing liquid are separated, the separated clear water enters the clean water pool 1, and the concentrated solution containing the salt content can be further evaporated and dried to recover the salt content in the concentrated solution.
Alternatively, the nozzle 21 is one of a hollow cone nozzle, a solid cone nozzle, a square nozzle, and an oval nozzle.
In the utility model, enterprises can select proper nozzles from the hollow cone nozzles, the solid cone nozzles, the square nozzles, the rectangular nozzles and the oval nozzles for use according to own requirements.
Alternatively, the evaporator 200 is a triple effect MVR evaporator.
In the utility model, the three-effect MVR evaporator is adopted, so that energy sources can be saved, and the production cost of enterprises can be saved.
Alternatively, the heat exchanger 3 is a tube heat exchanger or a plate heat exchanger.
In the utility model, enterprises can select one of the tube type heat exchanger and the plate type heat exchanger for use according to own requirements.
Optionally, the sand filter 100 is filled with quartz sand or manganese sand having a particle size of 0.1 to 0.5 cm.
In the utility model, quartz sand or manganese sand with the particle size of 0.1-0.5 cm is adopted to effectively intercept solid impurities in the waste liquid after the membrane component 4 is cleaned.
A reverse osmosis membrane cleaning system comprises the following working processes:
when the alkaline washing process is carried out, the acid outlet valve 81, the acid inlet valve 82, the water outlet valve 91, the water inlet valve 92 and the second air valve 11 are closed, the alkali outlet valve 71, the alkali inlet valve 72 and the air pump 10 are opened, alkali liquor (such as sodium hydroxide aqueous solution with pH value of 10-11) in the alkali liquor tank 7 enters the air-liquid mixer 13 through the alkali outlet valve 71, the alkali liquor is mixed with compressed air output by the air pump 10 in the air-liquid mixer 13 and sprayed into the dissolved air tank 1 to form supersaturated dissolved air water, when the liquid level in the dissolved air tank 1 reaches a preset value (such as 0.6-0.8 of the volume of the dissolved air tank 1), the second air valve 11 is opened, the compressed air is introduced into the dissolved air tank 1, the pressure in the dissolved air tank 1 is observed through the pressure gauge 14, when the pressure in the dissolved air tank 1 reaches a certain value (such as 0.7 MPa), the compressed air is communicated with the nozzle 21, the alkali liquor in the dissolved air tank 1 is sprayed into the liquid storage tank 2, at this time, the water in the liquid storage tank 2 is rich in a large amount of micro bubbles, namely dissolved gas alkali liquor, the dissolved gas alkali liquor is transferred into the heat exchanger 3 through the circulating pump 22 to be heated to 25-30 ℃, then is input into the membrane module 4 to wash the membrane module, the washed alkali liquor flowing out of the membrane module 4 flows into the buffer tank 5, is filtered and trapped by the sand filter 100 and the filter 6 and then enters the alkali liquor tank 7 through the alkali inlet valve 72 to carry out the next circulation, when the pH meter 51 in the buffer tank 5 detects that the pH value of the alkali liquor in the buffer tank is reduced (for example, the pH value is lower than 10), the staff can add high-concentration alkali liquor (for example, 20%wt sodium hydroxide aqueous solution) into the alkali liquor tank to maintain the alkalinity of the alkali liquor, when the pH meter 51 detects that the pH value of the alkali liquor in the buffer tank is kept unchanged within a certain time (for example, within 10-15 min), and (5) recirculating washing for 5-15 min, ending the alkaline washing process, and washing with water.
When the water washing process is performed, the alkali outlet valve 71, the acid outlet valve 81, the acid inlet valve 82, the water inlet valve 92 and the second air valve 11 are closed, and the water outlet valve 91, the water inlet valve 92 and the air pump 10 are opened, and the water outputted from the membrane module 4 in the water washing process is returned to the alkali liquor tank 7 through the alkali inlet valve 72. When the pH meter 51 detects that the pH value of the alkaline solution in the buffer tank is neutral and is unchanged for a period of time (such as 10-15 min) in the water washing process, the water washing is finished. Acid washing is carried out.
In the pickling process, the alkali outlet valve 71, the alkali inlet valve 72, the water outlet valve 91, the water inlet valve 92 and the second air valve 11 are closed, and the acid outlet valve 81, the acid inlet valve 82 and the air pump 10 are opened, so that the pickling process is the same as the alkali washing process, and the details are not repeated here. The aqueous solution of citric acid or oxalic acid having a pH of 2 to 3 is stored in the acid tank 8. When the pH meter 51 in the buffer tank 5 detects that the pH value of the acid solution in the buffer tank 5 is raised (for example, the pH is higher than 3), a worker can add a high-concentration acid solution (for example, saturated citric acid or oxalic acid aqueous solution) into the acid solution tank to maintain the acidity of the acid solution, and when the pH meter 51 detects that the pH value of the acid solution in the buffer tank 5 is kept unchanged for a certain time (for example, within 10-15 min), the recirculation washing is performed for 5-15 min, and the acid washing process is ended, so that the water washing is performed.
When the salt content in the alkali liquor pool 7 and the acid liquor pool 8 is too high, the alkali liquor in the alkali liquor pool 7 and the acid liquor in the acid liquor pool 8 can be input into the neutralization pool 20 for neutralization and then input into the evaporator 200 for evaporation and concentration, and the light component obtained after evaporation and concentration, namely water, can be input into the clean water pool 9 for storage, and the concentrated solution can be further concentrated for recovering the salt content.
It should be noted that the above-mentioned order of alkali washing and acid washing may be arranged according to the actual condition of the factory, but it is necessary to wash with water before another washing is performed, whether acid washing is performed first or alkali washing is performed first.
Experimental example
A batch of reverse osmosis membrane components to be cleaned are selected, the system is utilized for cleaning, and 5 of the reverse osmosis membrane components are selected to measure the water yield before and after cleaning.
In the comparative example, a conventional chemical washing mode is adopted, namely, the washing liquid does not pass through the dissolved gas treatment of the equipment such as the dissolved gas tank 1, the air pump 10, the gas-liquid mixer 13 and the nozzle 21, but directly exchanges heat and then washes the reverse osmosis membrane component, and the other equipment and the operation process are completely the same as those of the system of the utility model. The results are shown in Table 1.
TABLE 1
| Water yield before cleaning (m) 3 /h) | Post-wash water yield (m) 3 /h) | |
| 1 | 0.60 | 0.95 |
| 2 | 0.61 | 0.94 |
| 3 | 0.59 | 0.97 |
| 4 | 0.61 | 0.96 |
| 5 | 0.59 | 0.95 |
| Comparative example | 0.62 | 0.84 |
Finally, it should be noted that the above embodiments are merely illustrative of the technical solution of the present utility model, and not limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (7)
1. The reverse osmosis membrane cleaning system is characterized by comprising a dissolved air tank (1), a liquid storage tank (2), a circulating pump (22), a heat exchanger (3), a membrane component (4), a buffer tank (5) and a filter (6) which are sequentially connected in series;
the top of the dissolved air tank (1) is provided with a gas-liquid mixer (13), and the gas-liquid mixer (13) is connected with an air pump (10) through a first air valve (12); the air pump (10) is connected with the dissolved air tank (1) through a second air valve (11); the output end of the gas-liquid mixer (13) is arranged in the dissolved air tank (1); the dissolved air tank (1) is connected with the liquid storage tank (2) through a nozzle (21);
the gas-liquid mixer (13) is also connected with the alkali liquor tank (7) through an alkali outlet valve (71); the gas-liquid mixer (13) is also connected with the acid liquor pool (8) through an acid outlet valve (81); the gas-liquid mixer (13) is also connected with the clean water tank (9) through a water outlet valve (91);
the filter (6) is connected with the alkali liquor pool (7) through an alkali inlet valve (72), is connected with the acid liquor pool (8) through an acid inlet valve (82), and is connected with the clean water pool (9) through a water inlet valve (92);
the dissolved air tank (1) is also provided with a pressure gauge (14), and the buffer tank (5) is also internally provided with a pH gauge (51).
2. Reverse osmosis membrane cleaning system according to claim 1, characterized in that a sand filter (100) is provided between the buffer tank (5) and the filter (6).
3. Reverse osmosis membrane cleaning system according to claim 1 or 2, characterized in that the lye tank (7) and the acid tank (8) are connected to a neutralization tank (20), and that both the neutralization tank (20) and the clean water tank (9) are connected to an evaporator (200).
4. The reverse osmosis membrane cleaning system according to claim 1, wherein the nozzle (21) is one of a hollow cone nozzle, a solid cone nozzle, a square nozzle, an oval nozzle.
5. A reverse osmosis membrane cleaning system according to claim 3, characterized in that the evaporator (200) is a triple effect MVR evaporator.
6. Reverse osmosis membrane cleaning system according to claim 1, characterized in that the heat exchanger (3) is a tube array heat exchanger or a plate heat exchanger.
7. The reverse osmosis membrane cleaning system according to claim 2, wherein the sand filter (100) is filled with quartz sand or manganese sand having a particle size of 0.1 to 0.5 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320998679.2U CN219784379U (en) | 2023-04-28 | 2023-04-28 | Reverse osmosis membrane cleaning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320998679.2U CN219784379U (en) | 2023-04-28 | 2023-04-28 | Reverse osmosis membrane cleaning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219784379U true CN219784379U (en) | 2023-10-03 |
Family
ID=88158340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202320998679.2U Active CN219784379U (en) | 2023-04-28 | 2023-04-28 | Reverse osmosis membrane cleaning system |
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| CN117504604A (en) * | 2023-12-18 | 2024-02-06 | 山东海化集团有限公司 | A method of cleaning nanofiltration membranes using microbubbles |
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