CN106861441B - Method and device for cleaning water purification membrane module - Google Patents
Method and device for cleaning water purification membrane module Download PDFInfo
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- CN106861441B CN106861441B CN201710197868.9A CN201710197868A CN106861441B CN 106861441 B CN106861441 B CN 106861441B CN 201710197868 A CN201710197868 A CN 201710197868A CN 106861441 B CN106861441 B CN 106861441B
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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
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- 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
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- 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
- B01D2321/20—By influencing the flow
- B01D2321/2033—By influencing the flow dynamically
- B01D2321/2058—By influencing the flow dynamically by vibration of the membrane, e.g. with an actuator
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Abstract
The invention relates to a cleaning method of a water purification membrane component, which comprises the steps of carrying out at least one back washing step under the condition that a water purification valve is closed; the back flushing step comprises a first sub-step; the first substep is that under the state that the water inlet valve is opened and the through water valve is closed, the first time is separated, then the water inlet valve is closed and the through water valve is opened at the same time; closing the straight-through water valve and opening the water inlet valve at the same time at intervals of second time; the first time is less than or equal to t1, and the second time is less than or equal to t 2; wherein t1 is the time when the clean water completely fills the clean water cavity, and t2 is the time when the straight-through water valve is turned on from off. The cleaning method forms instant backwashing by water hammer pressure, thereby achieving the cleaning effect, having no need of externally configuring a backwashing pressure device, and having small product volume, low cost, no connecting parts and no hidden water leakage danger. The invention also provides a cleaning device for the water purification membrane component.
Description
Technical Field
The invention relates to the technical field of water purification, in particular to a method and a device for cleaning a water purification membrane component.
Background
With the development of socio-economy, the living standard of people is increasingly improved, and the cleanness and the sanitation of drinking water are more and more concerned. Various water purification products gradually enter various living places. The existing water purification product generally adopts a water purification membrane component. After the water purification membrane component is used for a period of time, impurities and other pollutants are collected, and the membrane filter element needs to be replaced or the water purification membrane component needs to be cleaned in time so as to keep the membrane filter element clean and avoid secondary pollution.
The traditional cleaning method of the water purification membrane component comprises a simple positive flushing cleaning method and a back flushing cleaning method. When the use load is increased or the water quality fluctuation is poor, the effect of the simple positive flushing cleaning method is not obvious, and the requirements of people cannot be met. The back washing method generally needs to add a back washing water pump or a back washing pressure water storage tank and other hardware configurations for providing back pressure, and the increase of the hardware configurations can cause the problems of increased product volume, increased cost, more connecting parts, large hidden water leakage danger and the like.
Therefore, a cleaning method that is simple and fast, does not require additional hardware configuration, and has a good cleaning effect is needed.
Disclosure of Invention
Therefore, it is necessary to provide a simple and fast method for cleaning a water purification membrane module with good cleaning effect without adding additional hardware configuration, aiming at the problems of poor effect and additional hardware configuration of the existing cleaning method.
A method for cleaning a water purification membrane component is disclosed, wherein the water purification membrane component is provided with a water inlet, a water purification port and a straight-through water port; the water purification membrane component also comprises a water inlet valve for opening and closing the water inlet, a water purification valve for opening and closing the water purification opening and a straight-through water valve for opening and closing the straight-through water opening;
the cleaning method comprises the following steps:
performing at least one backwashing step in a state that the purified water valve is closed;
the back flushing step comprises a first sub-step; the first substep is that under the state that the water inlet valve is opened and the through water valve is closed, the first time is separated, then the water inlet valve is closed, and the through water valve is opened at the same time; closing the through water valve and opening the water inlet valve at a second time interval;
the first time is less than or equal to t1, the second time is less than or equal to t 2; wherein t1 is the time when the purified water completely fills the purified water cavity, and t2 is the time when the straight-through water valve is turned on from off.
According to the cleaning method, the through water valve and the water inlet valve are continuously turned off or turned on in a short time to generate higher water hammer pressure, at the moment, after the water production cavity is filled, the through water valve is instantly turned on, the pressure on the inner side of the filtering membrane is reduced, the pressure on the outer side of the filtering membrane is higher, and purified water in the water production cavity reversely flows through the filtering membrane to form instant backwashing, so that pollutants on the inner side wall of the filtering membrane are washed away and discharged through the through water valve along with through water. By means of the water hammer pressure, a backflushing pressure device does not need to be configured outside, and the product is small in size, low in cost, free of connecting parts and free of water leakage hidden danger; importantly, the cleaning agent is simple and quick and has good cleaning effect.
In one embodiment, the cleaning method further comprises:
performing at least one vibration cleaning step under the conditions that the water inlet valve is opened and the purified water valve is closed;
the oscillation cleaning step comprises a second sub-step; the second substep is to change the state of the through water valve after a third time interval;
the third time is less than or equal to t 2.
In one embodiment, the oscillating cleaning step and the backwashing step are performed several times.
In one embodiment, the oscillating cleaning step and the backwashing step are continuously and alternately performed.
In one embodiment, one of said backwashing steps consists of a first substep and one of said shaking cleaning steps consists of a second substep.
In one embodiment, the oscillating cleaning step and the back washing step are continuously and alternately performed for 1-100 times.
In one embodiment, the shaking cleaning step and the backwashing step are alternately performed at intervals.
In one embodiment, one of the oscillating cleaning steps includes 1 to 100 of the second substeps.
In one embodiment, one of the backwashing steps includes 1 to 100 of the first substeps.
The invention also provides a cleaning device for the water purification membrane component.
A cleaning device for a water purification membrane module comprises:
the water purification membrane component comprises a tube cavity and a filtration membrane positioned in the tube cavity; a water producing cavity is formed between the filtering membrane and the tube cavity; the tube cavity is provided with a water inlet, a water purifying port and a straight-through water port; the water purification membrane component also comprises a water inlet valve for opening and closing the water inlet, a water purification valve for opening and closing the water purification opening and a straight-through water valve for opening and closing the straight-through water opening;
and a control unit for changing the state of the through water valve and the water inlet valve;
when the purified water valve is closed, the control unit closes the water inlet valve and opens the straight-through water valve at the same time at a first time interval when the water inlet valve is opened and the straight-through water valve is closed; closing the through water valve and opening the water inlet valve at a second time interval;
the first time is less than or equal to t1, the second time is less than or equal to t 2; wherein t1 is the time when the purified water completely fills the purified water cavity, and t2 is the time when the straight-through water valve is turned on from off.
The cleaning device of the water purification membrane component adopts the cleaning method provided by the invention. Therefore, the cleaning method is simple and quick, does not need to additionally increase hardware configuration, and has good cleaning effect.
Drawings
Fig. 1 is a schematic structural diagram of a water purification membrane module cleaning apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a method for cleaning a water purification membrane component, which is used for cleaning the water purification membrane component so as to keep the water purification membrane component clean.
Referring to fig. 1, the water purification membrane module 100 has a water inlet 111, a water purification port 112, and a through water port 113; the clean water membrane module 100 further comprises a water inlet valve F1 for opening and closing the water inlet 111, a clean water valve F2 for opening and closing the clean water outlet 112, and a straight-through water valve F3 for opening and closing the straight-through water outlet 113. In normal water purification operation, raw water enters the tube cavity 110 through the water inlet 111 and then flows from one side of the filtering membrane (not shown) to the other side thereof, thereby purifying the raw water into purified water, which enters the water producing cavity (not shown) and finally flows out through the water purifying port 112. If the purification is not needed, the raw water enters the tube cavity 110 from the water inlet 111 and is directly discharged from the straight water port 113 along one side of the filtering membrane.
The cleaning method of the invention comprises the following steps: at least one backwashing step is carried out with the clear water valve F2 closed.
Wherein, the back flushing step comprises a first substep; the first sub-step is that in the state that the water inlet valve F1 is opened and the through water valve F3 is closed, the first time is separated, then the through water valve F3 is opened and the water inlet valve F1 is closed; at a second time interval, closing the through water valve F3 and opening the water inlet valve F1; the first time is less than or equal to t1, and the second time is less than or equal to t 2; wherein t1 is the time when the purified water completely fills the purified water cavity, and t2 is the time when the straight-through water valve F3 is turned on from off.
Preferably, in all the first substeps, the first time is equal to t 1. Thus, the clean water for each backwashing is sufficient, and the cleaning effect is improved. Also preferably, in all the first substeps, the second time is equal to t 2. Thus, the back washing effect is better. Of course, it is understood that the present invention is not limited thereto, and the first times in the different first sub-steps may be the same or different; the first time may be the same or different in the first substep, as long as the first time is within the left-open/right-closed interval (0, t 1), and the second time may be the same or different in the first substep, as long as the second time is within the left-open/right-closed interval (0, t 2).
Preferably, one backwashing step includes 1 to 100 first substeps. This can further improve the cleaning effect. More preferably, one backwashing step includes continuously repeating 2 to 100 of the first substeps. That is, the next first sub-step is entered immediately after completion of one first sub-step; there is no time interval between two adjacent first sub-steps. Of course, it is understood that the present invention is not limited to the above number, and those skilled in the art can select other numbers.
In order to further improve the cleaning effect, the cleaning method of the present invention further includes:
at least one shaking cleaning step is performed with the feed valve F1 open and the clear water valve F2 closed.
Wherein, the oscillation cleaning step comprises a second substep; the second substep is to change the state of the feed-through water valve F3 after a third time interval; the third time is equal to or less than t 2. Thus, the state of the through water valve F3 is changed in a very short time interval, namely the through water valve F3 is frequently switched on and off, so that water hammer pressure is generated in the tube cavity 110, and simultaneously, the water in the tube cavity 110 is vibrated and turbulent, so that pollutants on the inner wall of the filtering membrane are washed and vibrated.
Preferably, one shaking cleaning step comprises 1 to 100 second substeps. This is more advantageous to enhance the cleaning effect. More preferably, one shaking cleaning step comprises repeating 2 to 100 second substeps in succession. That is, the next second substep is entered immediately after one second substep is completed; there is no time interval between two adjacent second sub-steps. This makes it easier to wash contaminants off the membrane filaments. Of course, it is understood that the present invention is not limited to the above number, and those skilled in the art can select other numbers.
Preferably, in one cleaning process, the oscillating cleaning step and the backwashing step are carried out for several times. This is advantageous for further improving the cleaning effect.
More preferably, the shaking cleaning step and the backwashing step are continuously alternated. That is, a shaking cleaning step is performed immediately after a backwashing step is completed, a backwashing step is performed immediately after the shaking cleaning step is completed, and so on. The backwashing step peels off and loosens the pollutants on the membrane and washes the pollutants off; the subsequent shaking cleaning step further enhances the cleaning of the membrane surface and also discharges the contaminants, thereby further improving the cleaning effect.
Further, a back-washing step is constituted by a first sub-step, and the shaking cleaning step is constituted by a second sub-step. That is, the oscillating cleaning step and the backwashing step are continuously alternated, and actually the first sub-step and the second sub-step are continuously alternated, that is, the second sub-step is performed immediately after the first sub-step is completed, and the first sub-step is performed immediately after the second sub-step is completed, and the steps are continuously repeated.
Preferably, the oscillating cleaning step and the back washing step are continuously and alternately carried out for 1-100 times. Therefore, the cleaning effect can be improved, and the cleaning time can be saved.
Of course, it is to be understood that the present invention is not limited to the above-described forms, but may be in other forms. For example, the vibration cleaning step and the back washing step are alternately carried out at intervals; namely, the adjacent oscillating cleaning step and the back washing step have certain time intervals. For example, the back washing step is randomly inserted among a plurality of shaking cleaning steps.
According to the cleaning method, the through water valve is instantly turned off or turned on to generate higher water hammer pressure, at the moment, after the water production cavity is full of water, the through water valve is instantly turned on, the pressure of the inner side of the filtering membrane is reduced, the pressure of the outer side of the filtering membrane is higher, water in the water production cavity reversely flows through the filtering membrane to form instant backwashing, so that pollutants on the inner side wall of the filtering membrane are washed away, and the pollutants are discharged through the through water valve along with the through water. By means of the water hammer pressure, a backflushing pressure device does not need to be configured outside, and the product is small in size, low in cost, free of connecting parts and free of water leakage hidden danger; importantly, the cleaning agent is simple and quick and has good cleaning effect.
The invention also provides a cleaning device for the water purification membrane component.
Referring to fig. 1, a cleaning device 1000 for a water purification membrane module includes: a water purification membrane module 100 and a control unit 200.
Wherein, the water purification membrane module 100 has a water inlet 111, a water purification port 112, and a through water port 113; the clean water membrane module 100 further comprises a water inlet valve F1 for opening and closing the water inlet 111, a clean water valve F2 for opening and closing the clean water outlet 112, and a straight-through water valve F3 for opening and closing the straight-through water outlet 113.
Preferably, the inlet valve F1, the clean water valve F2 and the straight-through water valve F3 are all solenoid valves. Of course, it should be understood that all of the valves may be electrically operated; or a part of the electromagnetic valve and a part of the electric valve.
The main function of the control unit 200 is to change the states of the feed-through water valve F3 and the feed valve F1. That is, the control unit 200 opens the through water valve F3 or closes the through water valve F3, and the control unit 200 opens the water inlet valve F1 or closes the water inlet valve F1.
For further integrated control, the control unit 200 is also used to switch the clean water valve F2. Of course, it is understood that the control unit 200 may not control the clean water valve F2.
In the state that the clear water valve F2 is closed, the control unit 200 closes the water inlet valve F1 and simultaneously opens the straight-through water valve F3 at a first time interval in the states that the water inlet valve F1 is opened and the straight-through water valve F3 is closed; at a second interval, the through water valve F3 is closed and the water inlet valve F1 is opened.
The cleaning device of the water purification membrane component adopts the cleaning method provided by the invention. Therefore, the cleaning method is simple and quick, does not need to additionally increase hardware configuration, and has good cleaning effect.
The invention is further illustrated by the following examples.
Example 1
And taking a water purification membrane component, wherein the time t1 that the purified water of the water purification membrane component is completely filled in the water production cavity is 2s, and the time t2 that the through water valve is completely closed to be completely opened is 1 s.
Closing the straight-through water valve at an interval of 2s under the condition that the water purification valve is closed, then closing the water inlet valve and simultaneously opening the straight-through water valve at an interval of 1s, and closing the straight-through water valve and simultaneously opening the water inlet valve; then the through water valve is opened at an interval of 1s, and then the through water valve is closed at an interval of 1 s. The above actions were repeated 20 times.
Example 2
And taking a water purification membrane assembly, wherein the time t1 that the purified water of the water purification membrane assembly is completely filled in the water production cavity is 4s, and the time t2 that the straight-through water valve is completely closed to be completely opened is 2 s.
Closing the straight-through water valve at an interval of 4s under the condition that the water purification valve is closed, then closing the water inlet valve and simultaneously opening the straight-through water valve at an interval of 2s, and closing the straight-through water valve and simultaneously opening the water inlet valve; then the through water valve is opened at an interval of 2s, and then the through water valve is closed at an interval of 2 s. The above actions were repeated 20 times.
And (3) testing the cleaning effect:
an entirely new clean water membrane module (two modules in example 1, two modules in example 2, respectively numbered as module 1, module 2, module 3 and module 4) was taken, and its initial flow rate Q1 was measured.
Then used for a period of time and its post-use flow rate is measured and designated as Q2.
Cleaning the used water purification membrane module, namely the module 1-2 by adopting the cleaning method of the embodiment 1, and the module 3-4 by adopting the cleaning method of the embodiment 2; the cleaned membrane module was cleaned, and the flow rate thereof after cleaning was measured and designated as Q3.
The results are shown in Table 1.
TABLE 1
| Assembly | Q1(m3/h) | Q2(m3/h) | Q3(m3/h) |
| 1 | 0.4 | 0.16 | 0.35 |
| 2 | 0.41 | 0.16 | 0.35 |
| 3 | 0.69 | 0.16 | 0.58 |
| 4 | 0.69 | 0.16 | 0.58 |
As can be seen from Table 1, the Q2 was significantly reduced after a period of use for each of the modules 1-4, indicating that there were more contaminants attached to the membrane module. After being cleaned by the cleaning method, the Q3 can reach the level of Q1 basically, which shows that the cleaning method can effectively remove the pollutants in the water purification membrane component and has good cleaning effect.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for cleaning a water purification membrane component is characterized in that the water purification membrane component is provided with a water inlet, a water purification port and a through water port; the water purification membrane component also comprises a water inlet valve for opening and closing the water inlet, a water purification valve for opening and closing the water purification opening and a straight-through water valve for opening and closing the straight-through water opening;
the cleaning method comprises the following steps:
performing at least one backwashing step in a state that the purified water valve is closed;
the back flushing step comprises a first sub-step; the first substep is that under the state that the water inlet valve is opened and the through water valve is closed, the first time is separated, then the water inlet valve is closed, and the through water valve is opened at the same time; closing the straight-through water valve and opening the water inlet valve at the same time at a second time interval;
the first time is less than or equal to t1, the second time is less than or equal to t 2; and t1 is the time when the purified water completely fills the purified water cavity, and t2 is the time when the through water valve is fully closed to fully opened.
2. The method of cleaning a membrane module according to claim 1, further comprising:
performing at least one vibration cleaning step under the conditions that the water inlet valve is opened and the purified water valve is closed;
the oscillation cleaning step comprises a second sub-step; the second substep is to change the state of the through water valve after a third time interval;
the third time is less than or equal to t 2.
3. The method for cleaning a water purification membrane module according to claim 2, wherein the shaking cleaning step and the backwashing step are performed several times.
4. The method for cleaning a water purification membrane module according to claim 3, wherein the shaking cleaning step and the backwashing step are continuously and alternately performed.
5. The method for cleaning a membrane module according to claim 4, wherein one of the backwashing steps is comprised of a first substep and one of the shaking cleaning steps is comprised of a second substep.
6. The cleaning method of the water purification membrane module according to claim 5, wherein the shaking cleaning step and the backwashing step are continuously and alternately performed for 1-100 times.
7. The method for cleaning a water purification membrane module according to claim 3, wherein the shaking cleaning step and the backwashing step are alternately performed at intervals.
8. The method for cleaning a water purification membrane module according to any one of claims 2 to 4, wherein one shaking cleaning step comprises 1 to 100 second substeps.
9. The method for cleaning a water purification membrane module according to any one of claims 1 to 4, wherein one backwashing step includes 1 to 100 first substeps.
10. A cleaning device for a water purification membrane module is characterized by comprising:
the water purification membrane component is provided with a water inlet, a water purification port and a straight-through water port; the water purification membrane component also comprises a water inlet valve for opening and closing the water inlet, a water purification valve for opening and closing the water purification opening and a straight-through water valve for opening and closing the straight-through water opening;
and a control unit for changing the state of the through water valve and the water inlet valve;
when the purified water valve is closed, the control unit closes the water inlet valve and opens the straight-through water valve at the same time at a first time interval when the water inlet valve is opened and the straight-through water valve is closed; closing the straight-through water valve and opening the water inlet valve at the same time at a second time interval;
the first time is less than or equal to t1, the second time is less than or equal to t 2; and t1 is the time when the purified water completely fills the purified water cavity, and t2 is the time when the through water valve is fully closed to fully opened.
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| CN109012206B (en) * | 2018-10-30 | 2024-04-09 | 杭州老板电器股份有限公司 | Filter element and water purifier |
| CN114515464B (en) * | 2020-11-17 | 2024-05-07 | 台湾积体电路制造股份有限公司 | Filtration system and method of cleaning a filtration device |
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