CN114380368A - Bipolar membrane water purification system, regeneration method and water purification equipment - Google Patents
Bipolar membrane water purification system, regeneration method and water purification equipment Download PDFInfo
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- CN114380368A CN114380368A CN202011106561.1A CN202011106561A CN114380368A CN 114380368 A CN114380368 A CN 114380368A CN 202011106561 A CN202011106561 A CN 202011106561A CN 114380368 A CN114380368 A CN 114380368A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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Abstract
The invention discloses a bipolar membrane water purification system, a regeneration method and water purification equipment, which comprise a main pipeline, a first valve, a second valve, a regenerated water outlet pipeline, a bipolar membrane filter element, a third valve, a regenerated water inlet pipeline and a fourth valve; the first valve, the bipolar membrane filter element and the fourth valve are sequentially arranged on the main pipeline according to the water flow direction in the main pipeline; the regenerated water inlet pipeline is communicated with the main pipeline and is positioned between the bipolar membrane filter element and a fourth valve, and the third valve is arranged on the regenerated water inlet pipeline; the regenerated water outlet pipeline is communicated with the main pipeline and is positioned between the first valve and the bipolar membrane filter element, and the second valve is arranged on the regenerated water outlet pipeline. According to the water purification system, the bipolar membrane filter element can be continuously regenerated, the service life is long, the cost is low, the bipolar membrane filter element does not need to be frequently replaced, the regeneration process can be completed only by reversely powering up, and the operation is simple and convenient.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a bipolar membrane water purification system, a regeneration method and water purification equipment.
Background
With the development of science and technology and higher requirements of people on living quality, the water treatment technology provides clean and healthier drinking water for people. At present, the drinking water is generally treated by filtering through various filter elements to obtain drinking water meeting the requirements of people. The commonly used filter element at present comprises a PP cotton filter element, an active carbon filter element, a reverse osmosis filter element and the like.
When the filter elements are applied to a water purification system, the filter elements are short in service life, high in cost, required to be replaced frequently and troublesome in operation.
Disclosure of Invention
The invention aims to provide a bipolar membrane water purification system, a regeneration method and water purification equipment, which have the advantages of long service life, low cost, no need of frequent replacement and convenience in operation.
The invention discloses a bipolar membrane water purification system, which comprises a main pipeline, a first valve, a second valve, a regenerated water outlet pipeline, a bipolar membrane filter element, a third valve, a regenerated water inlet pipeline and a fourth valve, wherein the main pipeline is connected with the first valve; the first valve, the bipolar membrane filter element and the fourth valve are sequentially arranged on the main pipeline according to the water flow direction in the main pipeline; the regenerated water inlet pipeline is communicated with the main pipeline and is positioned between the bipolar membrane filter element and a fourth valve, and the third valve is arranged on the regenerated water inlet pipeline; the regenerated water outlet pipeline is communicated with the main pipeline and is positioned between the first valve and the bipolar membrane filter element, and the second valve is arranged on the regenerated water outlet pipeline.
Optionally, the water purification system comprises a bidirectional flow meter for monitoring bidirectional water flow in the main pipeline; the bidirectional flowmeter is arranged on the main pipeline and is positioned between the bipolar membrane filter element and the reclaimed water inlet pipeline.
Optionally, the water purification system comprises a TDS meter; the TDS meter is located before the bipolar membrane filter core, and sets up regeneration water goes out the water piping or on the main line between bipolar membrane filter core and the regeneration water outlet pipe way.
Optionally, the water purification system comprises a PH meter; the PH meter is positioned in front of the bipolar membrane filter element and is arranged on the regenerated water outlet pipeline or on a main pipeline between the bipolar membrane filter element and the regenerated water outlet pipeline.
The invention also discloses a regeneration method of the bipolar membrane water purification system, which is applied to the bipolar membrane water purification system and comprises the following steps:
step A: the first valve and the fourth valve are closed, the second valve and the third valve are opened, the regenerated water flows into the main pipeline from the regenerated water inlet pipeline, flows through the bipolar membrane filter element and flows out from the regenerated water outlet pipeline;
and B: and reversely electrifying the bipolar membrane filter element.
Optionally, the regeneration method further comprises the steps of:
and stopping the regeneration of the water purification system according to the water flow of the inflow of the regenerated water inlet pipeline monitored by the bidirectional flowmeter.
Optionally, the regeneration method further comprises the steps of:
and stopping the regeneration of the water purification system according to the ratio of the purified water flow monitored by the bidirectional flowmeter to the water flow flowing into the regenerated water inlet pipeline.
Optionally, the regeneration method further comprises the steps of:
according to the TDS value of the bipolar membrane filter element discharged water of TDS meter monitoring, if the TDS value is less than the TDS threshold value, then stop water purification system regeneration.
Optionally, the regeneration method further comprises the steps of:
and according to the pH value of the water discharged from the bipolar membrane filter element monitored by the pH meter, if the pH value is higher than a pH threshold value, the regeneration of the water purification system is stopped.
Optionally, the regeneration method further comprises the steps of:
and according to the current value between the positive plate and the negative plate of the bipolar membrane filter element, if the current value is lower than the current threshold value, the regeneration of the water purification system is stopped.
Optionally, before the step a, the method further includes the steps of:
recording the amount of ions adsorbed by a positive or negative polar plate of the bipolar membrane filter element in the water production process of the water purification system;
the regeneration method further comprises the steps of:
and according to the ion adsorption amount of the positive or negative polar plate of the bipolar membrane filter element, if the ion adsorption amount of the positive or negative polar plate is zero, the regeneration of the water purification system is stopped.
Optionally, the regeneration method further comprises the steps of:
in the first regeneration stage, the water flow in the regeneration water inlet pipeline adopts a first flow velocity;
in the second regeneration stage, the water flow in the regenerated water inlet pipeline adopts a second flow rate;
wherein the second flow rate is greater than the first flow rate.
Optionally, the second flow rate is more than twice the first flow rate.
The invention also discloses water purification equipment comprising the water purification system.
According to the water purification system, the bipolar membrane filter element can be continuously regenerated, the service life is long, the cost is low, the bipolar membrane filter element does not need to be frequently replaced, the regeneration process can be completed only by reversely powering up, and the operation is simple and convenient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a water purification system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a bipolar membrane cartridge according to an embodiment of the present invention for adsorbing ions;
FIG. 3 is a schematic illustration of the regeneration of a bipolar membrane cartridge according to an embodiment of the present invention;
FIG. 4 is another schematic diagram of a water purification system according to an embodiment of the present invention;
FIG. 5 is a flow chart of a regeneration method according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a water purification system according to an embodiment of the present invention.
Wherein, 1, a water purifying device; 2. a water purification system; 3. a main pipeline; 4. a first valve; 5. a second valve; 6. a reclaimed water outlet pipeline; 7. a bipolar membrane cartridge; 8. a third valve; 9. a reclaimed water inlet pipeline; 10. a fourth valve; 11. a bidirectional flow meter; 12. a TDS meter; 13. and a pH meter.
Detailed Description
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
The invention is described in detail below with reference to the figures and alternative embodiments.
As shown in fig. 1, as an embodiment of the present invention, a bipolar membrane water purification system 2 is disclosed, which includes a main pipeline 3, a first valve 4, a second valve 5, a regenerated water outlet pipeline 6, a bipolar membrane filter element 7, a third valve 8, a regenerated water inlet pipeline 9, and a fourth valve 10; the first valve 4, the bipolar membrane filter element 7 and the fourth valve 10 are sequentially arranged on the main pipeline 3 according to the water flow direction in the main pipeline 3; the regenerated water inlet pipeline 9 is communicated with the main pipeline 3 and is positioned between the bipolar membrane filter element 7 and a fourth valve 10, and the third valve 8 is arranged on the regenerated water inlet pipeline 9; the regenerated water outlet pipeline 6 is communicated with the main pipeline 3 and is positioned between the first valve 4 and the bipolar membrane filter element 7, and the second valve 5 is arranged on the regenerated water outlet pipeline 6.
As shown in FIG. 2, the bipolar membrane filter element 7 used in the present invention is composed of one or more pairs of electrodes, and at least one or more bipolar membranes between the electrodes; each bipolar membrane consists of a cation exchange membrane and an anion exchange membrane which are compounded together, the cation exchange membrane and the anion exchange membrane which form the bipolar membrane form a runner.
In the bipolar membrane cartridge 7, in the desalination process, the anode of the bipolar membrane faces the positive electrode, and raw water is desalinated in the flow channel formed between the two bipolar membranes, as shown in fig. 2. Anions in the raw water such as Cl < - > move towards the positive electrode to replace OH < - > in the anion exchange membrane on the left side, and OH < - > enters the flow channel; meanwhile, cations such as Na + in the raw water move towards the negative electrode direction to replace H + ions in the cation exchange membrane of the bipolar membrane on the right side, and the H + enters the flow channel; h + and OH-are subjected to neutralization reaction in the flow channel to generate water, so that the salt in the raw water is removed, and the pure water flows out from the tail end of the flow channel.
When desalination is carried out for a period of time, the bipolar membrane filter element 7 needs to be subjected to reverse regeneration, and then the bipolar membrane filter element 7 is reversely electrified to release ions in water adsorbed on the bipolar membrane. At this time, as shown in fig. 3, OH "and H + ions are generated in the interface layers of the cation membrane and the anion membrane of the bipolar membrane under the electric field, cations such as Na + inside the cation membrane of the bipolar membrane are replaced by the H + ions and move toward the negative electrode, anions such as Cl" in the anion membrane of the bipolar membrane are replaced by OH "and move toward the positive electrode, and Na + and Cl" enter the flow channel, thereby realizing the regeneration process of the bipolar membrane cartridge 7.
In the water purification system 2, the first valve 4 and the fourth valve 10 are opened when water is produced. When the bipolar membrane filter element 7 is regenerated, the first valve 4 and the fourth valve 10 are closed, the second valve 5 and the third valve 8 are opened, and the regenerated water for flushing and replacement flows into the main pipeline 3 from the regenerated water inlet pipeline 9 and flows out from the regenerated water outlet pipeline 6 after flowing through the bipolar membrane filter element 7. At the moment, the bipolar membrane filter element 7 is reversely electrified, Na + and Cl-enter the regenerated water in the flow channel and flow out of the regenerated water outlet pipeline 6, and the regeneration process of the bipolar membrane filter element 7 is realized.
The regenerated water does not require specific water, and can be raw water or purified water; or soft water, purified water, etc. The raw water is tap water and the like which are connected into a municipal pipeline, and the purified water refers to water which is filtered by the filtering element and can be drunk by a user.
According to the water purification system 2, the bipolar membrane filter element 7 can be continuously regenerated, the service life is long, the cost is low, the bipolar membrane filter element 7 does not need to be frequently replaced, the regeneration process can be completed only by reversely powering up, and the operation is simple and convenient.
Specifically, as shown in fig. 1, the water purification system 2 includes a bidirectional flow meter 11 for monitoring a bidirectional water flow rate in the main pipeline 3; the bidirectional flowmeter 11 is arranged on the main pipeline 3 and is positioned between the bipolar membrane filter element 7 and the reclaimed water inlet pipeline 9. The bidirectional water flow refers to the water flow in the direction in which the water in the main pipe 3 flows from the first valve 4 to the fourth valve 10 during water production, and the water flow in the direction in which the regenerated water flows into the main pipe 3 from the regenerated water inlet pipe 9, flows through the bipolar membrane filter element 7, and flows out from the regenerated water outlet pipe 6. The bidirectional flowmeter 11 can monitor the water flow in the main pipeline 3 during water production and can also monitor the flow of regenerated water during regeneration of the bipolar membrane filter element 7. In the scheme, whether the bipolar membrane filter element 7 starts regeneration or not, the regeneration duration and the regeneration ending are controlled according to the proportion between the water flow in the main pipeline 3 and the flow of the regenerated water during water production, so that the operation is convenient, and the regeneration of the bipolar membrane filter element 7 is controlled. For example, when the water flow in the main pipeline 3 reaches a liter when water production is monitored, regeneration is started; according to the A liter, the regeneration can be completed only by introducing B liter of regeneration water, the time length of introducing B liter of regeneration water is the regeneration time length, and then the regeneration is finished.
As shown in fig. 4, the water purification system 2 includes a TDS meter 12; the TDS meter 12 is positioned in front of the bipolar membrane filter element 7 and is arranged on the regenerated water outlet pipeline 6 or on the main pipeline 3 between the bipolar membrane filter element 7 and the regenerated water outlet pipeline 6. The water purification system 2 can determine whether to regenerate according to the TDS value (Total dissolved solids) of the water discharged from the bipolar membrane filter element 7 monitored by the TDS meter 12. If the TDS value is lower than the TDS threshold value, the regeneration of the water purification system 2 is stopped, and the regeneration of the water purification system 2 is conveniently controlled.
More specifically, the TDS meter 12 is arranged on the regeneration water outlet line 6 between the second valve 5 and the main line 3. Of course, the TDS meter 12 may also be provided on the regeneration water outlet line 6 after the second valve 5.
As shown in fig. 4, the water purification system 2 includes a PH meter 13; the PH meter 13 is positioned in front of the bipolar membrane filter element 7 and is arranged on the regenerated water outlet pipeline 6 or on the main pipeline 3 between the bipolar membrane filter element 7 and the regenerated water outlet pipeline 6.
The water purification system 2 can determine whether to stop regeneration according to the pH value of the water discharged by the bipolar membrane filter element 7 monitored by the pH meter 13. If the PH value is lower than the PH threshold value, the regeneration of the water purification system 2 is stopped, and the regeneration of the water purification system 2 is conveniently controlled.
More specifically, the PH meter 13 is arranged on the outlet conduit 6 of the regenerating water between the second valve 5 and the main conduit 3. Of course, the PH meter 13 may be disposed on the regenerated water outlet line 6 after the second valve 5.
As shown in fig. 5, the present invention also discloses a method for regenerating the bipolar membrane water purification system 2, which is applied to the bipolar membrane water purification system 2, and comprises:
step A: the first valve 4 and the fourth valve 10 are closed, the second valve 5 and the third valve 8 are opened, the regenerated water flows into the main pipeline 3 from the regenerated water inlet pipeline 9, flows through the bipolar membrane filter element 7 and flows out from the regenerated water outlet pipeline 6;
and B: the bipolar membrane cartridge 7 is reversely energized.
As shown in figure 2, during normal water production, the bipolar membrane filter element 7 is positively electrified. When the bipolar membrane cartridge 7 needs to be regenerated, the bipolar membrane cartridge 7 is energized in reverse, as shown in fig. 3. According to the method, when the bipolar membrane filter element 7 needs to be regenerated, the first valve 4 and the fourth valve 10 are closed, the second valve 5 and the third valve 8 are opened, and the bipolar membrane filter element 7 is reversely powered up, so that the operation is simple and convenient, the bipolar membrane filter element 7 of the water purification system 2 can be continuously regenerated, the service life is long, the cost is low, and the bipolar membrane filter element 7 does not need to be frequently replaced. It should be noted that step a and step B do not limit the order of sequence.
Specifically, the regeneration method further comprises the steps of:
and stopping the regeneration of the water purification system 2 according to the water flow of the inflow of the regenerated water inlet pipeline 9 monitored by the bidirectional flowmeter 11. In this scheme, can decide whether bipolar membrane filter core 7 finishes regeneration according to the discharge of the inflow of regeneration water inlet line 9, can conveniently, control the regeneration of bipolar membrane filter core 7 directly perceived.
In yet another embodiment, the regeneration method further comprises the steps of:
and stopping the regeneration of the water purification system 2 according to the ratio between the purified water flow and the water flow flowing into the regenerated water inlet pipeline 9 monitored by the bidirectional flow meter 11. In the scheme, whether the bipolar membrane filter element 7 starts regeneration or not, the regeneration duration and the regeneration ending are controlled according to the proportion between the water flow in the main pipeline 3 and the flow of the regenerated water during water production, so that the operation is convenient, and the regeneration of the bipolar membrane filter element 7 is controlled. For example, when the water flow in the main pipeline 3 reaches a liter when water production is monitored, regeneration is started; according to the A liter, the regeneration can be completed only by introducing B liter of regeneration water, the time length of introducing B liter of regeneration water is the regeneration time length, and then the regeneration is finished.
Specifically, the regeneration method further comprises the steps of:
according to the TDS value of the bipolar membrane filter core 7 exhaust water of TDS meter 12 monitoring, if the TDS value is less than the TDS threshold value, then stop 2 regeneration of water purification system. The regeneration of the bipolar membrane cartridge 7 can be conveniently and intuitively controlled.
Specifically, according to the PH value of the water discharged from the bipolar membrane filter element 7 monitored by the PH meter 13, if the PH value is higher than the PH threshold value, the regeneration of the water purification system 2 is stopped. The regeneration of the bipolar membrane cartridge 7 can be conveniently and intuitively controlled.
Specifically, the regeneration method further comprises the steps of:
and according to the current value between the positive plate and the negative plate of the bipolar membrane filter element 7, if the current value is lower than the current threshold value, the regeneration of the water purification system 2 is stopped.
Because the positive and negative plates of the bipolar membrane filter element 7 adsorb a large amount of positive and negative ions, in the regeneration process, the flow channel between the positive and negative plates can generate current due to the movement of the positive and negative ions. When the regeneration is started, the current is larger, and along with the regeneration, the positive and negative ions are continuously reduced, and the current is also continuously reduced. The regeneration of the bipolar membrane filter element 7 can be conveniently and intuitively controlled by the current value between the positive and negative electrode plates of the bipolar membrane filter element 7.
Specifically, the step a further comprises the following steps:
recording the amount of ions absorbed by a positive or negative polar plate of the bipolar membrane filter element 7 in the process of producing water by the water purification system 2;
the regeneration method further comprises the steps of:
according to the amount of ions adsorbed by the positive or negative polar plate of the bipolar membrane filter element 7, if the amount of ions adsorbed by the positive or negative polar plate is zero, the regeneration of the water purification system 2 is stopped.
The positive or negative electrode plate of the bipolar membrane cartridge 7 has a certain limit to the amount of ions that can be adsorbed. In the scheme, the condition of regeneration completion is judged directly through the amount of ions which can be adsorbed by the positive or negative polar plate, so that the regeneration progress and whether regeneration is completed or not are mastered, and the regeneration of the bipolar membrane filter element 7 can be controlled more directly and accurately. The positive or negative plate of the bipolar membrane filter 7 according to the present invention adsorbs ions in the ions, which are ions to be removed from the raw water, such as Cl and Na + and do not contain OH and H +.
In another embodiment, the regeneration method may further include the steps of:
according to the amount of the ions which can be adsorbed by the positive or negative polar plate of the bipolar membrane filter element 7, if the amount of the ions adsorbed by the positive or negative polar plate is lower than the threshold value of the adsorbed ions, the regeneration of the water purification system 2 is stopped.
Specifically, the regeneration method further comprises the steps of:
in the first regeneration phase, the flow of water in the regeneration water inlet line 9 assumes a first flow rate;
in the second regeneration stage, the flow of water in the regeneration water inlet line 9 adopts a second flow rate;
wherein the second flow rate is greater than the first flow rate.
During regeneration, the first and second regeneration phases may be divided according to time, TDS value, PH value, current value, amount of ions adsorbed by the positive or negative plate, etc. For example, within 5 minutes of the start of regeneration is a first regeneration phase followed by a second regeneration phase. For another example, when the TDS value of the water discharged from the bipolar membrane filter element 7 is greater than a certain TDS value, the first regeneration stage is performed; when the TDS value of the water discharged by the bipolar membrane filter element 7 is less than a certain TDS value, the second regeneration stage is performed. The division is performed according to the PH value, the current value, the amount of ions adsorbed by the positive or negative plate, and the like, which are not described herein again.
In the scheme, when the regeneration is started, the first flow rate with the slower flow rate is used firstly, so that the water can be saved, and the cost is reduced; in the second regeneration stage, the bipolar membrane filter element 7 and the pipeline are washed by using a second flow rate with a faster flow rate, and residual substances in the bipolar membrane filter element 7 and the pipeline are washed away, so that the problem of head cup water when the water purification system 2 is started next time is solved.
Specifically, the second flow rate is more than twice the first flow rate.
As shown in fig. 6, as another embodiment of the present invention, a water purifying apparatus is disclosed, the water purifying apparatus 1 includes the water purifying system 2 as described above.
It should be noted that, the limitations of the steps involved in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all should be considered to belong to the protection scope of the present disclosure.
The foregoing is a more detailed description of the invention in connection with specific alternative embodiments, and the practice of the invention should not be construed as limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (14)
1. A bipolar membrane water purification system is characterized by comprising a main pipeline, a first valve, a second valve, a regenerated water outlet pipeline, a bipolar membrane filter element, a third valve, a regenerated water inlet pipeline and a fourth valve; the first valve, the bipolar membrane filter element and the fourth valve are sequentially arranged on the main pipeline according to the water flow direction in the main pipeline; the regenerated water inlet pipeline is communicated with the main pipeline and is positioned between the bipolar membrane filter element and a fourth valve, and the third valve is arranged on the regenerated water inlet pipeline; the regenerated water outlet pipeline is communicated with the main pipeline and is positioned between the first valve and the bipolar membrane filter element, and the second valve is arranged on the regenerated water outlet pipeline.
2. The bipolar membrane water purification system of claim 1, wherein the water purification system comprises a bi-directional flow meter for monitoring bi-directional water flow within the main conduit; the bidirectional flowmeter is arranged on the main pipeline and is positioned between the bipolar membrane filter element and the reclaimed water inlet pipeline.
3. The bipolar membrane water purification system of claim 1, wherein the water purification system comprises a TDS meter; the TDS meter is located before the bipolar membrane filter core, and sets up regeneration water goes out the water piping or on the main line between bipolar membrane filter core and the regeneration water outlet pipe way.
4. The bipolar membrane water purification system of claim 1, wherein the water purification system comprises a PH meter; the PH meter is positioned in front of the bipolar membrane filter element and is arranged on the regenerated water outlet pipeline or on a main pipeline between the bipolar membrane filter element and the regenerated water outlet pipeline.
5. A bipolar membrane water purification system regeneration method applied to the bipolar membrane water purification system of any one of claims 1 to 4, comprising:
step A: the first valve and the fourth valve are closed, the second valve and the third valve are opened, the regenerated water flows into the main pipeline from the regenerated water inlet pipeline, flows through the bipolar membrane filter element and flows out from the regenerated water outlet pipeline;
and B: and reversely electrifying the bipolar membrane filter element.
6. The bipolar membrane water purification system regeneration method of claim 5, wherein the regeneration method further comprises the steps of:
and stopping the regeneration of the water purification system according to the water flow of the inflow of the regenerated water inlet pipeline monitored by the bidirectional flowmeter.
7. The bipolar membrane water purification system regeneration method of claim 5, wherein the regeneration method further comprises the steps of:
and stopping the regeneration of the water purification system according to the ratio of the purified water flow monitored by the bidirectional flowmeter to the water flow flowing into the regenerated water inlet pipeline.
8. The bipolar membrane water purification system regeneration method of claim 5, wherein the regeneration method further comprises the steps of:
according to the TDS value of the bipolar membrane filter element discharged water of TDS meter monitoring, if the TDS value is less than the TDS threshold value, then stop water purification system regeneration.
9. The bipolar membrane water purification system regeneration method of claim 5, wherein the regeneration method further comprises the steps of:
and according to the pH value of the water discharged from the bipolar membrane filter element monitored by the pH meter, if the pH value is higher than a pH threshold value, the regeneration of the water purification system is stopped.
10. The bipolar membrane water purification system regeneration method of claim 5, wherein the regeneration method further comprises the steps of:
and according to the current value between the positive plate and the negative plate of the bipolar membrane filter element, if the current value is lower than the current threshold value, the regeneration of the water purification system is stopped.
11. The bipolar membrane water purification system regeneration method of claim 5, wherein step A is preceded by the step of:
recording the amount of ions adsorbed by a positive or negative polar plate of the bipolar membrane filter element in the water production process of the water purification system;
the regeneration method further comprises the steps of:
and according to the ion adsorption amount of the positive or negative polar plate of the bipolar membrane filter element, if the ion adsorption amount of the positive or negative polar plate is zero, the regeneration of the water purification system is stopped.
12. The bipolar membrane water purification system regeneration method of claim 5, wherein the regeneration method further comprises the steps of:
in the first regeneration stage, the water flow in the regeneration water inlet pipeline adopts a first flow velocity;
in the second regeneration stage, the water flow in the regenerated water inlet pipeline adopts a second flow rate;
wherein the second flow rate is greater than the first flow rate.
13. The bipolar membrane water purification system regeneration method of claim 12, wherein the second flow rate is more than twice the first flow rate.
14. A water purification apparatus, comprising the water purification system of any one of claims 1 to 4.
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