CN110327784B - Security filter and sterilization method of reverse osmosis membrane - Google Patents
Security filter and sterilization method of reverse osmosis membrane Download PDFInfo
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- CN110327784B CN110327784B CN201910435309.6A CN201910435309A CN110327784B CN 110327784 B CN110327784 B CN 110327784B CN 201910435309 A CN201910435309 A CN 201910435309A CN 110327784 B CN110327784 B CN 110327784B
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- Prior art keywords
- reverse osmosis
- osmosis membrane
- security filter
- sterilization
- bactericide
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 77
- 239000012528 membrane Substances 0.000 title claims abstract description 70
- 230000001954 sterilising effect Effects 0.000 title claims abstract description 45
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 29
- 239000003899 bactericide agent Substances 0.000 claims abstract description 29
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 238000011084 recovery Methods 0.000 claims description 3
- 239000003206 sterilizing agent Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 9
- 241000894006 Bacteria Species 0.000 abstract description 6
- 241000195493 Cryptophyta Species 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003442 weekly effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/16—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using chemical substances
- A61L2/18—Liquid substances or solutions comprising solids or dissolved gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/04—Feed pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/08—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/10—Accessories; Auxiliary operations
-
- 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
Abstract
The invention discloses a sterilizing method of a security filter and a reverse osmosis membrane, and relates to the technical field of sterilization and cleaning of the security filter and the reverse osmosis membrane. A bactericide adding metering pump is installed in front of a security filter, adding of a reducing agent is stopped before sterilization, the bactericide adding metering pump is started to sterilize the security filter and a reverse osmosis membrane, online sterilization is carried out on the security filter and the reverse osmosis membrane in a continuous circulation mode, the adding of the reducing agent is resumed after the bactericide is completely added, sterilization is carried out once per week at the temperature of 30-35 ℃ according to the reverse osmosis operation temperature, and sterilization is carried out twice per week at the temperature of 35-40 ℃. Aiming at multiple defects of the traditional sterilization method, the invention provides an improved sterilization method, which can effectively inhibit the reproduction of bacteria and algae of a security filter and a reverse osmosis membrane in time, reduce the pollution and blockage frequency of the security filter and the reverse osmosis membrane and improve the operation efficiency of the security filter and the reverse osmosis membrane.
Description
Technical Field
The invention relates to the technical field of sterilization and cleaning of security filters and reverse osmosis membranes, in particular to a sterilization method of a security filter and a reverse osmosis membrane.
Background
Reverse osmosis, also known as reverse osmosis, is a membrane separation operation that uses a pressure differential as a driving force to separate a solvent from a solution. Applying pressure to the feed solution on one side of the membrane, and when the pressure exceeds the osmotic pressure thereof, the solvent will permeate in the opposite direction against the natural permeation direction, so as to obtain a permeated solvent, namely a permeate, on the low pressure side of the membrane; the high pressure side yields a concentrated solution, i.e., a concentrate. 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 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 reverse osmosis membrane technical system has the advantages of good filtering water quality, low energy consumption, no pollution, simple process, simple and convenient operation and the like, and is widely applied to various water treatment processes.
The safety filter is also called as a precision filter and is generally arranged in front of a pressure container to remove fine particles so as to meet the requirement of the subsequent process on water inlet; sometimes also at the end of the overall water treatment system to prevent fine particles from entering the product water. The security filter is mainly used for filtering fine substances filtered by a plurality of media after multi-media pretreatment filtration and before membrane filtration equipment such as reverse osmosis, ultrafiltration and the like so as to ensure that the water quality filtration precision and a protective membrane filter element are not damaged by large-particle substances.
Safety filters and reverse osmosis membranes often suffer from microbial fouling during use and it is therefore essential to employ effective sterilization methods. At present, the domestic reverse osmosis membrane is generally sterilized by using a cleaning water tank before the reverse osmosis membrane is cleaned on line. The method comprises the following specific steps: (1) filling the cleaning water tank with water and adding a bactericide; (2) the reverse osmosis membrane needing sterilization is stopped; (3) pumping the bactericide into the reverse osmosis membrane by using a reverse osmosis membrane online cleaning pump for circulating sterilization; (4) and cleaning the reverse osmosis membrane after sterilization is finished, and discharging the bactericide and the cleaning agent.
This method of sterilization has the following drawbacks:
1. the reverse osmosis membrane is sterilized before the water tank is cleaned on line, the sterilization period is long, only one set of sterilization is performed, the effect is poor, bacteria and algae on the security filter are bred too fast, and thick liquid is formed everywhere on the wall of the filter tank, so that the replacement frequency of the filter element of the security filter is increased, the service life of the filter element is reduced, and the use cost of the filter element is increased;
2. the reverse osmosis membrane is polluted and blocked to accelerate the operation period to be shortened, the pressure difference between the inlet and the outlet of the reverse osmosis membrane is increased, the online cleaning frequency of the reverse osmosis membrane is increased, the service life of the reverse osmosis membrane is shortened, and the operation cost is increased.
Disclosure of Invention
The invention aims to solve the problems and provides a method for sterilizing a security filter and a reverse osmosis membrane, which can effectively inhibit the reproduction of bacteria and algae of the security filter and the reverse osmosis membrane in time, reduce the pollution and blockage frequency of the security filter and the reverse osmosis membrane and improve the operating efficiency of the security filter and the reverse osmosis membrane.
In order to realize the purpose, the invention adopts the technical scheme that: a sterilization method for a security filter and a reverse osmosis membrane comprises the following steps: .
1) A bactericide adding metering pump is arranged in front of the cartridge filter;
2) stopping adding the reducing agent before adding the bactericide;
3) starting a bactericide feeding metering pump to sterilize the security filter and the reverse osmosis membrane;
4) continuously and circularly sterilizing the security filter and the reverse osmosis membrane on line;
5) after the bactericide is completely added, the addition of the reducing agent is resumed;
6) sterilization was performed weekly according to reverse osmosis operating temperature.
Further, the step 2) of stopping the addition of the reducing agent is performed 15 minutes before the addition of the bactericide.
Further, the addition of the reducing agent in the recovery step 5) is started after the bactericide is completely added and 15 minutes has elapsed.
Further, in the step 6), the reverse osmosis is sterilized once per week at the operating temperature of 30-35 ℃, and is sterilized twice per week at the operating temperature of 35-40 ℃.
The invention has the beneficial effects that:
1. the invention installs a bactericide adding metering pump before the security filter, and can directly add the bactericide into the main water inlet pipe before the security filter for sterilization; the reducing agent is stopped being added 15 minutes before the bactericide is added, so that the effect of the bactericide can be prevented from being influenced; the continuous circulation is adopted to sterilize the security filter and the reverse osmosis membrane on line, the reverse osmosis membrane needing sterilization does not need to be stopped, the reproduction of bacteria and algae of the security filter and the reverse osmosis membrane device can be effectively inhibited in time, the pollution and blockage frequency of the security filter and the reverse osmosis membrane is reduced, and the operation efficiency of the security filter and the reverse osmosis membrane is improved;
2. according to the invention, the reverse osmosis operation temperature is 30-35 ℃, the sterilization is carried out once per week, the sterilization is carried out twice per week at 35-40 ℃, and the continuous circulation is adopted during the sterilization to carry out highly effective online sterilization on the cartridge filter and the reverse osmosis membrane, so that the replacement frequency of the cartridge filter element can be reduced, the service life of the filter element can be prolonged, and the use cost of the filter element can be reduced;
3. according to the invention, the reverse osmosis membrane is sterilized once per week when the reverse osmosis operation temperature is 30-35 ℃, is sterilized twice per week when the temperature is 35-40 ℃, and is continuously circulated to perform highly effective online sterilization on the security filter and the reverse osmosis membrane during sterilization, so that the cleaning frequency of the reverse osmosis membrane can be reduced, the service life of the reverse osmosis membrane is prolonged (the reverse osmosis membrane is damaged to a certain extent when being cleaned once, the aging time of the reverse osmosis membrane is shortened), and the cleaning cost is reduced.
Drawings
FIG. 1 is a schematic view of the process flow of the cartridge filter and the reverse osmosis membrane sterilization method of the present invention.
Fig. 2 is a process flow diagram of a conventional security filter and reverse osmosis membrane sterilization method.
Detailed Description
The invention is further illustrated by the following examples.
A sterilization method for a security filter and a reverse osmosis membrane comprises the following steps:
1) a bactericide adding metering pump is installed in front of the security filter, and the bactericide is directly added into a main water inlet pipe in front of the security filter for sterilization;
2) stopping adding the reducing agent before adding the bactericide;
3) starting a bactericide feeding metering pump to sterilize the security filter and the reverse osmosis membrane;
4) continuous circulation is carried out on-line sterilization on the security filter and the reverse osmosis membrane, so that organic fouling and blockage of the security filter and the reverse osmosis membrane caused by bacteria and algae are reduced;
5) after the bactericide is completely added, the addition of the reducing agent is resumed;
6) sterilization was performed weekly according to reverse osmosis operating temperature.
Preferably, the stopping of the addition of the reducing agent in the step 2) is performed 15 minutes before the addition of the bactericide, so as to avoid affecting the effect of the bactericide.
Preferably, the addition of the reducing agent in the recovery step 5) is started after the bactericide is completely added and 15 minutes has elapsed.
Preferably, the reverse osmosis in the step 6) is sterilized once per week at the operating temperature of 30-35 ℃ and twice per week at the operating temperature of 35-40 ℃, so that the good operation effect of the security filter and the reverse osmosis membrane can be maintained.
In summary, the invention provides a plurality of beneficial improvements aiming at a plurality of defect points existing in the traditional sterilization method of the security filter and the reverse osmosis membrane: the method effectively inhibits the reproduction of bacteria and algae of the security filter and the reverse osmosis membrane in time, reduces the pollution and blockage frequency of the security filter and the reverse osmosis membrane, improves the operating efficiency of the security filter and the reverse osmosis membrane, prolongs the service life of a filter element of the security filter and the reverse osmosis membrane, and reduces the use cost. The advantages of the security filter and the reverse osmosis membrane technology are exerted greatly, the environmental protection and energy saving are facilitated, the popularization and the application are more suitable, and more economic benefits are generated.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein, and the above description of the embodiments is only used to help understand the method and its core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (3)
1. A sterilization method for a security filter and a reverse osmosis membrane is characterized by comprising the following steps:
1) a bactericide adding metering pump is arranged in front of the cartridge filter;
2) stopping adding the reducing agent before adding the bactericide;
3) starting a bactericide feeding metering pump to sterilize the security filter and the reverse osmosis membrane;
4) continuously and circularly sterilizing the security filter and the reverse osmosis membrane on line;
5) after the bactericide is completely added, the addition of the reducing agent is resumed;
6) sterilizing every week according to the reverse osmosis operating temperature, sterilizing once every week when the reverse osmosis operating temperature is 30-35 ℃, and sterilizing twice every week when the reverse osmosis operating temperature is 35-40 ℃.
2. The method for sterilizing a security filter and a reverse osmosis membrane according to claim 1, wherein the stopping of the addition of the reducing agent in step 2) is performed 15 minutes before the addition of the sterilizing agent.
3. The method for sterilizing a security filter and a reverse osmosis membrane according to claim 1, wherein the addition of the reducing agent in the recovery step 5) is started after 15 minutes has elapsed since the bactericide was completely added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910435309.6A CN110327784B (en) | 2019-05-23 | 2019-05-23 | Security filter and sterilization method of reverse osmosis membrane |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910435309.6A CN110327784B (en) | 2019-05-23 | 2019-05-23 | Security filter and sterilization method of reverse osmosis membrane |
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| Publication Number | Publication Date |
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| CN110327784A CN110327784A (en) | 2019-10-15 |
| CN110327784B true CN110327784B (en) | 2020-10-02 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11244852A (en) * | 1998-02-26 | 1999-09-14 | Japan Organo Co Ltd | Desalination device and back washing method of filter used for desalination device |
| CN202139126U (en) * | 2011-06-15 | 2012-02-08 | 北京科泰兴达高新技术有限公司 | Sea water desalinization system |
| CN102580537B (en) * | 2012-03-05 | 2014-04-16 | 山西太钢不锈钢股份有限公司 | Method for regenerating filter core of security filter |
| CN105384316B (en) * | 2015-12-18 | 2018-02-16 | 无锡德宝水务投资有限公司 | A kind of processing method of the fluorine-containing nitrogen-containing wastewater of electronics industry |
| CN207267828U (en) * | 2017-04-25 | 2018-04-24 | 张家港市骏马钢帘线有限公司 | A kind of city domestic sewage recycling device |
| CN107789989B (en) * | 2017-11-24 | 2021-06-01 | 内蒙古农业大学 | Reverse osmosis membrane full-process preventive sterilization method |
| CN207748981U (en) * | 2017-12-27 | 2018-08-21 | 东莞市小水滴水处理科技有限公司 | A kind of sewage disposal device that clean-up effect is good |
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Effective date of registration: 20230621 Address after: 414002 Room 695, Building A, Phase I, Lingang High tech Industrial Park, Yongji Avenue, Yueyang District, China (Hunan) Pilot Free Trade Zone, Yueyang, Hunan Province Patentee after: Hunan Chengtong Tianyue Environmental Protection Technology Co.,Ltd. Address before: 414002 No.1 Guangming Road, Chenglingji, Yueyanglou District, Yueyang, Yueyang, Hunan Province Patentee before: YUEYANG PAPER Co.,Ltd. |
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