CN115432771A - Bipolar membrane electric auxiliary deionization device and regenerated water outlet control method thereof - Google Patents
Bipolar membrane electric auxiliary deionization device and regenerated water outlet control method thereof Download PDFInfo
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- CN115432771A CN115432771A CN202110617656.8A CN202110617656A CN115432771A CN 115432771 A CN115432771 A CN 115432771A CN 202110617656 A CN202110617656 A CN 202110617656A CN 115432771 A CN115432771 A CN 115432771A
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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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
- C02F2303/16—Regeneration of sorbents, filters
Abstract
A bipolar membrane electric auxiliary deionization device regenerated water outlet control method and a bipolar membrane electric auxiliary deionization device regenerated by using the bipolar membrane electric auxiliary deionization device regenerated water outlet control method are disclosed, time of a regeneration stage of the bipolar membrane electric auxiliary deionization device is defined as a regeneration time period, and in the regeneration time period, water outlet time of the bipolar membrane electric auxiliary deionization device is longer than 50% of the regeneration time period. The invention keeps the pH value of the effluent in a stable lower range all the time in the regeneration process, and can effectively prevent the scaling and blockage of the bipolar membrane electric auxiliary deionization device. The regeneration method of the invention is used for regenerating the bipolar membrane electric auxiliary deionization device, and the desalination rate can be maintained at a higher level, thereby greatly prolonging the service life of the bipolar membrane electric auxiliary deionization device.
Description
Technical Field
The invention relates to the technical field of water purification, in particular to a regenerated water outlet control method of a bipolar membrane electric auxiliary deionization device and the bipolar membrane electric auxiliary deionization device regenerated by using the regeneration method.
Background
The bipolar membrane electric auxiliary deionization device is used as a water treatment technology and comprises an electrode group and bipolar membranes positioned between the electrodes, each bipolar membrane comprises a cation exchange membrane and an anion exchange membrane which are attached together, and a flow channel is formed between each bipolar membrane and the adjacent bipolar membrane or between the adjacent electrodes. The bipolar membrane electric auxiliary deionization device mainly comprises a desalination process and a regeneration process.
In the prior art, the regeneration process of the bipolar membrane electric auxiliary deionization device is carried out by electrifying electrodes arranged on the bipolar membrane electric auxiliary deionization device to apply voltage, and adopting a pulse water outlet control method in the water outlet mode in the electrifying process. Specifically, water is alternately discharged, that is, on the premise that voltage is applied between electrodes in each cycle period, the bipolar membrane electric auxiliary deionization device is controlled to discharge water in a time period T1, the bipolar membrane electric auxiliary deionization device is controlled not to discharge water in a next time period T2, and T1 is equal to or different from T2, the bipolar membrane electric auxiliary deionization device is controlled to discharge water in a next time period T1, and then the bipolar membrane electric auxiliary deionization device is controlled not to discharge water in a next time period T2, wherein water is discharged in 8230, water is discharged in 828230, and the water is continuously and alternately circulated. For example, 60 seconds is taken as a pulse period, wherein water does not flow out in the first 45 seconds and water flows out in the last 15 seconds; then in the next pulse period of 45 seconds, water is discharged in the first 45 seconds, and water is not discharged in the last 15 seconds; 823080, and repeating the above steps for 10 pulse periods. In the prior art, a method for controlling a water outlet mode in the regeneration process of a bipolar membrane electric auxiliary deionization device is to adopt an alternative mode of water outlet and water non-outlet in a pulse period. The bipolar membrane electric auxiliary deionization device for controlling the water outlet in the regeneration process by using the pulse water outlet control method has the advantages that the initial desalination rate can reach about 90% at the initial stage of use, but the desalination rate rapidly drops to less than 80% after the water production amount reaches 500L, the filter element performance is seriously attenuated along with the prolonging of the water preparation time and the further the time, so that the filter element performance is seriously attenuated.
In the bipolar membrane electric auxiliary deionization device adopting the pulse water outlet control method to control the water outlet in the regeneration process in the prior art, the desalination rate is reduced faster along with the increase of the water making quantity (or the water preparation time), the attenuation of the filter element is obvious, and the service life of the filter element is shorter. In addition, in the process of controlling and regenerating pulse effluent, the pH value of the solution tends to rise, and particularly in the later regeneration stage, the pH value is often greater than 10, so that the pipeline is easy to be blocked due to scaling.
Therefore, it is necessary to provide a method for controlling the regenerated effluent of a bipolar membrane electric auxiliary deionization device and a bipolar membrane electric auxiliary deionization device using the same to solve the deficiencies of the prior art.
Disclosure of Invention
One of the purposes of the invention is to provide a method for controlling the regenerated effluent of a bipolar membrane electric auxiliary deionization device, which avoids the defects of the prior art. The method for controlling the regenerated effluent of the bipolar membrane electric auxiliary deionization device can keep the desalination rate of the bipolar membrane electric auxiliary deionization device continuously and stably kept at a higher level, overcome the problem of filter element attenuation in the prior art and prolong the service life of the bipolar membrane electric auxiliary deionization device.
The above object of the present invention is achieved by the following technical measures:
the method for controlling the regenerated water outlet of the bipolar membrane electric auxiliary deionization device is provided, wherein the duration of the regeneration phase of the bipolar membrane electric auxiliary deionization device is defined as the regeneration time period, and in the regeneration time period, the water outlet duration of the bipolar membrane electric auxiliary deionization device is greater than 50% of the regeneration time period.
Preferably, the above-mentioned water outlet time period is equal to the regeneration time period.
Preferably, the above-mentioned water outlet time is equal to 90% to 99% of the regeneration time period.
The regeneration flow rate is the waste water flow rate in the regeneration time period, and the water production flow rate is the purified water flow rate of the bipolar membrane electric auxiliary deionization device under the water production working condition; the regeneration flow rate is less than 50% of the water production flow rate.
The regeneration flow rate is less than 30% of the water production flow rate.
The regeneration flow rate is the instantaneous flow rate in at least one calibration time period in the regeneration time period, and the instantaneous flow rate at any time in the calibration time period is greater than 0; or
The regeneration flow rate is the average flow rate in at least one calibration time period in the regeneration time period, and the average flow rate is greater than 0; or
The regeneration flow rate is the minimum flow rate in at least one calibration time period in the regeneration time period, and the minimum flow rate is greater than 0.
The duration of the calibration period is less than or equal to 50% of the duration of the regeneration period.
Defining the total water output produced during the regeneration period as A.
Defining the total water purification amount of the bipolar membrane electric auxiliary deionization device under the water making working condition as B under the time equal to the time length of the regeneration time period, and enabling the water to exist by 0 & lt A & lt 90 percent.
The regenerated water outlet control method of the bipolar membrane electric auxiliary deionization device provided by the invention is characterized in that the regeneration flow rate is regulated through at least one of pump frequency conversion, a flow limiting hole or a flow regulating valve.
It is another object of the present invention to avoid the disadvantages of the prior art and to provide a bipolar membrane electrically assisted deionization device. The desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
The above object of the present invention is achieved by the following technical measures:
the bipolar membrane electric auxiliary deionization device is regenerated according to the regeneration water outlet control method of the bipolar membrane electric auxiliary deionization device.
The invention relates to a regenerated water outlet control method of a bipolar membrane electric auxiliary deionization device and the bipolar membrane electric auxiliary deionization device regenerated by using the regenerated water outlet control method of the bipolar membrane electric auxiliary deionization device, wherein the time of the bipolar membrane electric auxiliary deionization device in a regeneration stage is defined as a regeneration time period, and in the regeneration time period, the water outlet duration of the bipolar membrane electric auxiliary deionization device is more than 50% of the regeneration time period. The invention keeps the pH value of the effluent in a stable lower range all the time in the regeneration process, and can effectively prevent the scaling and blockage of the bipolar membrane electric auxiliary deionization device. And the regeneration method of the invention is used for regenerating the bipolar membrane electric auxiliary deionization device, so that the desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
Drawings
The invention is further illustrated by means of the attached drawings, the content of which is not in any way limiting.
FIG. 1 is a schematic diagram of desalination in a bipolar membrane electrically-assisted deionization apparatus.
FIG. 2 is a schematic diagram of the regeneration of a bipolar membrane electrically assisted deionization device.
Fig. 3 is a graph showing the relationship between the cumulative water production and the salt rejection rate in the case of regeneration by the pulse regeneration method.
FIG. 4 is a graph showing the relationship between the cumulative water production and the salt rejection rate of regeneration by the regeneration method of the present invention.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
Unless clearly defined otherwise herein, the meanings of the scientific and technical terms used are those commonly understood by those skilled in the art to which this application belongs. As used in this application, the terms "comprising," "including," "having," or "containing" and similar referents to shall mean that the content of the listed items is within the scope of the listed items or equivalents thereof.
In the specification and claims, the singular and plural of all terms are not intended to be limiting unless expressly stated otherwise. The use of "first," "second," and similar language in the description and claims of this application does not denote any order, quantity, or importance, but rather the intention is to distinguish one material from another, or embodiment.
Unless the context clearly dictates otherwise, the term "or", "or" does not mean exclusively, but means that at least one of the mentioned items (e.g. ingredients) is present, and includes the case where a combination of the mentioned items may be present.
References in the specification to "some embodiments" or the like indicate that a particular element (e.g., feature, structure, and/or characteristic) described in connection with the invention is included in at least one embodiment described in the specification, and may or may not be present in other embodiments. In addition, it is to be understood that the described inventive elements may be combined in any suitable manner.
Reference herein to "deionization" is to the removal of ions from the liquid to be treated, including anions and cations in various valence states. In most cases, "deionization" has the same meaning as "desalination". In some cases, deionization is also referred to as demineralization.
Example 1.
A regenerated water outlet control method for a bipolar membrane electric auxiliary deionization device is characterized in that the time length of a regeneration phase of the bipolar membrane electric auxiliary deionization device is defined as a regeneration time period, and in the regeneration time period, the water outlet time length of the bipolar membrane electric auxiliary deionization device is greater than 50% of the regeneration time period.
The bipolar membrane electrically assisted deionization apparatus including at least one pair of electrode groups and one or more bipolar membrane structures disposed between two electrodes constituting the electrode groups will be described as an example. Wherein each bipolar membrane consists of a cation exchange membrane and an anion exchange membrane which are bonded together, and no flow channel is arranged between the cation exchange membrane and the anion exchange membrane which form the same bipolar membrane. The bipolar membrane is composed of a cation exchange membrane and an anion exchange membrane which are attached together. The bipolar membranes sold in the market can be used as the bipolar membranes in the scheme, and the details are not repeated. The electrode group can be composed of two porous electrodes, or a porous electrode and a common electrode or two common electrodes. Common electrodes such as metal electrodes, titanium electrodes with ruthenium-yttrium coatings, ruthenium-yttrium electrodes, carbon electrodes, graphite electrodes, and the like.
The desalting process of the bipolar membrane electrically-assisted deionization apparatus is shown in fig. 1. When desalination is performed for a period of time, reverse regeneration is required to release ions in water adsorbed on the bipolar membrane, and the regeneration stage in the invention refers to a process of continuously applying a voltage to the bipolar membrane electric auxiliary deionization apparatus and generating a current in a direction opposite to that of the current in the desalination process in the bipolar membrane electric auxiliary deionization apparatus, as shown in fig. 2.
In the prior art, the bipolar membrane electric auxiliary deionization device which controls the water outlet in the regeneration process by a pulse water outlet control method has the advantages that the pH value of the solution tends to rise along with the regeneration time and is more than 10 at the later regeneration stage. This phenomenon is probably caused by the generation of a large amount of H during regenerative power-up + And OH - Most of the time, the water does not flow in the bipolar membrane electric auxiliary deionization device, so that local overheating and uneven flow are caused. Meanwhile, the formation of scale is facilitated, the pipeline is easily blocked, and the scale is attached to the surface of the membrane stack to further hinder the desorption effect of ions during regeneration, so that the membrane cannot be effectively regenerated and the problem of serious attenuation occurs, and the service life of the bipolar membrane electric auxiliary deionization device is directly shortened.
The water outlet time of the invention is kept longer than 50% of the regeneration time in the regeneration process, therefore, the water flows in the bipolar membrane electric auxiliary deionization device for more than half of the time, compared with the regeneration of the pulse water outlet control method, the pH value is always kept stable in a lower range, so that the generation of scale can be avoided, the pipeline is smooth, the condition that the scale is attached to the surface of a membrane stack is avoided, the desorption effect of ions in the regeneration process is facilitated, the desalination rate of the filter element can be continuously and stably maintained at a higher degree (the desalination rate is basically more than 90%), and the service life of the filter element membrane is longer.
The regeneration water outlet control method of the bipolar membrane electric auxiliary deionization device regenerates the bipolar membrane electric auxiliary deionization device, can continuously and stably keep the desalination rate of the bipolar membrane electric auxiliary deionization device at a higher level, overcomes the problem of filter element attenuation in the prior art, and prolongs the service life of the bipolar membrane electric auxiliary deionization device.
Example 2.
A regeneration water outlet control method for a bipolar membrane electric auxiliary deionization device is characterized in that the time of the bipolar membrane electric auxiliary deionization device in a regeneration stage is defined as a regeneration time period, and in the regeneration time period, the water outlet time length is greater than 70% of the regeneration time period.
The water outlet time of the invention exceeds 70 percent of the regeneration time in the regeneration process, so that more than half of the time of the water in the bipolar membrane electric auxiliary deionization device flows, and compared with the regeneration of the pulse water outlet control method, the OH of the invention - The bipolar membrane electric auxiliary deionization device can be timely and smoothly discharged, so that the pH value is always kept stable in a lower range in the regeneration process, scale can be prevented from being generated, smoothness of pipelines is facilitated, the condition that the scale is attached to the surface of a membrane stack is avoided, desorption of ions in the regeneration process is facilitated, the desalination rate of the filter element can be continuously and stably maintained at a higher degree (the desalination rate is basically more than 90%), and the service life of the filter element membrane is longer.
The water run-out time is longer in this example compared to example 1, and therefore more favourable for the OH produced - The bipolar membrane electric auxiliary deionization device is discharged smoothly in time, so that the desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
Example 3.
The other characteristics of the method for controlling the regenerated effluent of the bipolar membrane electric auxiliary deionization device are the same as those of the embodiment 1 or 2, and the method also has the following characteristics: the water outlet time is equal to 90-99% of the regeneration time period.
The water run-out time is longer in this example compared to example 1, and therefore more favourable for the OH produced - The bipolar membrane electric auxiliary deionization device is discharged smoothly in time, so that the bipolar membrane electric auxiliary deionization device can be further realizedThe desalination rate of the ion device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
Example 4.
The other characteristics of the method are the same as those of the embodiment 1 or 2, and the method also has the following characteristics: the water outlet time length is equal to the regeneration time period.
That is, the present embodiment performs water discharge all the time in the regeneration period, that is, the water discharge time is 100%.
Therefore, the water in the bipolar membrane electric auxiliary deionization device is always in a flowing state, and compared with the regeneration of a pulse water outlet control method, the bipolar membrane electric auxiliary deionization device generates OH in the flowing state - Will discharge in time, so the pH value keeps stabilizing in the non-alkaline range all the time in the regeneration process, so can avoid the incrustation scale to produce, do benefit to the pipeline unblocked, will not have incrustation scale to adhere to the situation on the membrane stack surface yet, do benefit to the desorption effect of ion during regeneration, the desalination rate of the filter core can last stably to maintain at higher degree (the desalination rate is above 90% basically), the life-span of the filter core diaphragm is longer.
FIG. 3 is a graph showing the relationship between the cumulative water production and the salt rejection of a bipolar membrane electrically-assisted deionization apparatus regenerated by a conventional pulse regeneration method, and FIG. 4 is a graph showing the relationship between the cumulative water production and the salt rejection of the same type of bipolar membrane electrically-assisted deionization apparatus regenerated by the regeneration method of the present invention.
In fig. 3, when the cumulative water production amount reaches 500L, the desalination rate of the bipolar membrane electrically-assisted deionization apparatus decreases from 80% to 95% in the initial state to 75% to 80%, and at this time, the bipolar membrane electrically-assisted deionization apparatus is significantly clogged with scale. In fig. 4, even when the accumulated water production reaches 750L, the desalination rate is still stabilized at 80% -95% of the initial state, and after the accumulated water production reaches 750L, the bipolar membrane electrically-assisted deionization device is not scaled and has no pipeline blockage phenomenon.
Compared with the embodiments 1 and 2, the embodiment can better keep the desalination rate of the bipolar membrane electric auxiliary deionization device continuously and stably at a higher level, overcome the problem of filter element attenuation in the prior art and better prolong the service life of the bipolar membrane electric auxiliary deionization device.
Example 5.
A method for controlling the regenerated effluent of a bipolar membrane electric auxiliary deionization device has the following characteristics, which are the same as any one of embodiments 1 to 4: the flow rate of the regeneration wastewater is less than 30 percent of the flow rate of the purified water. The regeneration flow rate is the waste water flow rate in the regeneration time period, and the water production flow rate is the purified water flow rate of the bipolar membrane electric auxiliary deionization device in the water production working condition.
In the prior art, the pulse regeneration does not limit the flow speed when water is discharged, and the regeneration flow speed is the same as the water production flow speed. The flow rate of the wastewater during regeneration is less than 30% of the flow rate of the purified water during water production, the wastewater can be reduced, the desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
Example 6.
The other characteristics of the method for controlling the regenerated effluent of the bipolar membrane electric auxiliary deionization device are the same as those of the embodiment 5, and the method also has the following characteristics: the regeneration flow rate is an average flow rate during at least one calibration period of the regeneration period, and the average flow rate is greater than 0.
The duration of the calibration period is less than or equal to 50% of the duration of the regeneration period. The calibration time period of the present invention may be several seconds, several tens of seconds, or 1 minute or several minutes, and the specific setting is selected according to the actual operation.
It should be noted that, the duration of the calibration time period of the present invention is defined as B, and the duration of the regeneration time period is defined as B; the calibration period referred to herein is any continuous period of time within the regeneration period.
According to the invention, a plurality of calibration time periods are connected and spliced to form the whole regeneration time period, for example, when the duration of the regeneration time period is 600 seconds, the calibration time period is 60 seconds, and then 10 calibration time periods can be connected and spliced to form the regeneration time period.
The calibration time period of the present invention may also be any time point in the regeneration time period as a starting point, and the time b seconds after the time point is the calibration time period, and a plurality of calibration time periods may be in discontinuous distribution in the regeneration time period. For example, when the regeneration period is 600 seconds long and the calibration period is 250 seconds, then within the regeneration period of 600 seconds, there may be less than 10 calibration periods, assuming there are two calibration periods, one of which may be in the first half of the regeneration period and the other of which may be in the second half of the regeneration period, and these two calibration periods are not connected; it is also possible that both calibration periods are distributed in the latter half of the regeneration period, and that the two calibration periods are not consecutive.
The regeneration time period of the present invention may be a time period t1 at a certain range of flow rate a for regeneration, and another time period t2 at another range of flow rate b for regeneration, and the time period t1 and the time period t2 are alternately performed. And the calibration time period may be equal to the duration of time period t 1; the calibration time period may also be equal to the duration of the time period t 2; the calibration time period can also span the time period t1 and the time period t2, and the duration of the calibration time period is less than the sum of the time period t1 and the time period t 2; the calibration period may also be the sum of the time period t1 and the time period t 2.
It should be noted that the regeneration flow rate is not constant during the regeneration period, and may be larger at a certain stage, smaller at a certain stage, for example, smaller at the front stage of regeneration and larger at the rear stage of regeneration, so as to discharge the desorbed ions.
Defining the water yield generated in the regeneration time period as A; defining the water yield of the bipolar membrane electrically assisted deionization device under the water making condition as B for a time equal to the duration of the regeneration period, the presence of 0 < A ≦ 90% B.
It should be noted that the water yield of the regeneration time period of the bipolar membrane electric auxiliary deionization device is less than that of the water making working condition, so that the pure wastewater ratio can be improved, and the wastewater generation can be reduced.
The instantaneous flow rate at any time during the regeneration period is greater than 0, namely the invention continuously discharges water during the regeneration period.
The flow rate of the effluent water during regeneration is less than 30% of the flow rate during water production, waste water can be reduced, the desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged. This embodiment can improve pure waste water ratio and can consequently reduce waste water and produce.
Example 7.
The other characteristics of the method are the same as those of the embodiment 6, except that: the regeneration flow rate is an average flow rate during at least one calibration period of the regeneration period, and the average flow rate is greater than 0.
It should be noted that the regeneration flow rate is not constant during the regeneration period, but may be larger in a certain period, smaller in a certain period, for example, smaller in the front period of regeneration and larger in the rear period of regeneration, so as to discharge the desorbed ions.
The calibration time period of the present invention may be several seconds, several tens of seconds, or 1 minute or several minutes, and the specific setting is selected according to the actual operation, and the calibration time period of the present invention example 6 is specifically 30 seconds.
The flow rate of the effluent water during regeneration is less than 30% of the flow rate during water production, waste water can be reduced, the desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
Example 8.
The other characteristics of the method are the same as those of the embodiment 6, except that: the regeneration flow rate is a minimum flow rate during at least one calibration period of the regeneration period, and the minimum flow rate is greater than 0.
It should be noted that the regeneration flow rate is not constant during the regeneration period, and the minimum flow rate in a certain stage may be larger, the minimum flow rate in a certain stage may be smaller, for example, the minimum flow rate in the front stage of regeneration is smaller, and the minimum flow rate in the rear stage of regeneration is larger, so as to discharge the desorbed ions. The calibration time period of the present invention may be several seconds, several tens of seconds, or 1 minute or several minutes, and the specific setting is selected according to the actual operation, and the calibration time period of the present invention is specifically 30 seconds.
The flow rate of the effluent water during regeneration is less than 30% of the flow rate during water production, waste water can be reduced, the desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
Example 9.
The other characteristics of the method for controlling the regenerated effluent of the bipolar membrane electric auxiliary deionization device are the same as those of the embodiment 5, 6 or 7, and the method also has the following characteristics: the regeneration flow rate was 1ml/m 2 /min～100ml/m 2 /min。
The regeneration flow rate value range of the embodiment can reduce the generation of waste water, and simultaneously can continuously and stably keep the desalination rate of the bipolar membrane electric auxiliary deionization device at a higher level, overcome the problem of filter element attenuation in the prior art and prolong the service life of the bipolar membrane electric auxiliary deionization device.
Example 10.
The other characteristics of the method are the same as those of the embodiment 5, 6 or 7, and the method also has the following characteristics: the regeneration flow rate is 2ml/m 2 /min～70ml/m 2 /min。
The regeneration flow rate value range of the embodiment is better than that of the embodiments 7 and 8 in the effect of reducing wastewater, and meanwhile, the desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is overcome, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
Example 11.
The other characteristics of the method for controlling the regenerated effluent of the bipolar membrane electric auxiliary deionization device are the same as those of the embodiment 5, 6 or 7, and the method also has the following characteristics: the regeneration flow rate was 4ml/m 2 /min～40ml/m 2 /min。
The regeneration flow rate value range of the embodiment has the best effect of reducing waste water compared with the embodiments 8 and 9, and meanwhile, the desalination rate of the bipolar membrane electric auxiliary deionization device can be continuously and stably kept at a higher level, the problem of filter element attenuation in the prior art is solved, and the service life of the bipolar membrane electric auxiliary deionization device is prolonged.
Example 12.
A method for controlling the regenerated effluent of a bipolar membrane electric auxiliary deionization device, which has the same other characteristics as any one of embodiments 1 to 11, further has the following characteristics: this embodiment regulates the regeneration flow rate by at least one of a pump variable frequency, a flow restriction orifice, or a flow regulating valve.
The method adjusts the regeneration flow rate by a simple method, and has the advantages of convenient operation and high flow rate adjustment precision.
Example 13.
A bipolar membrane electric auxiliary deionization apparatus, which is regenerated according to the method for controlling the regenerated water outlet of the bipolar membrane electric auxiliary deionization apparatus as described in any one of embodiments 1 to 12.
The bipolar membrane electric auxiliary deionization device can continuously and stably keep the desalination rate of the bipolar membrane electric auxiliary deionization device at a higher level, overcome the problem of filter element attenuation in the prior art and prolong the service life of the bipolar membrane electric auxiliary deionization device.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A method for controlling the regenerated water outlet of a bipolar membrane electric auxiliary deionization device is characterized by comprising the following steps: the duration of the regeneration phase of the bipolar membrane electric auxiliary deionization device is defined as a regeneration time period, and the water outlet duration of the bipolar membrane electric auxiliary deionization device is more than 50% of the regeneration time period in the regeneration time period.
2. The method for controlling the regeneration effluent of the bipolar membrane electric-assisted deionization device according to claim 1, wherein: the water outlet time period is equal to the regeneration time period.
3. The method for controlling the regeneration effluent of a bipolar membrane electric-assisted deionization device according to claim 1, wherein: the water outlet time is equal to 90-99% of the regeneration time period.
4. The method for controlling the regeneration effluent of a bipolar membrane electric-assisted deionization device according to claim 1, wherein: the regeneration flow rate is the waste water flow rate in the regeneration time period, and the water production flow rate is the purified water flow rate of the bipolar membrane electric auxiliary deionization device under the water production working condition; the regeneration flow rate is less than 50% of the water production flow rate.
5. The method for controlling the regeneration effluent of a bipolar membrane electric-assisted deionization device according to claim 4, wherein: the regeneration flow rate is less than 30% of the water production flow rate.
6. The method for controlling the regeneration effluent of the bipolar membrane electric-assisted deionization device according to claim 4 or 5, wherein: the regeneration flow rate is an instantaneous flow rate in at least one calibration time period in the regeneration time period, and the instantaneous flow rate at any time in the calibration time period is greater than 0; or
The regeneration flow rate is the average flow rate in at least one calibration time period in the regeneration time period, and the average flow rate is greater than 0; or
The regeneration flow rate is the minimum flow rate in at least one calibration time period in the regeneration time period, and the minimum flow rate is greater than 0.
7. The method for controlling the regeneration effluent of the bipolar membrane electric-assisted deionization device according to claim 4 or 5, wherein: the duration of the calibration period is less than or equal to 50% of the duration of the regeneration period.
8. The method for controlling the regenerated effluent of the bipolar membrane electric-assisted deionization device according to claim 4 or 5, wherein: defining a total water yield produced during said regeneration period as A;
defining the total water purification amount of the bipolar membrane electric auxiliary deionization device under the water making working condition as B under the time equal to the time length of the regeneration time period, and enabling the water to exist by 0 & lt A & lt 90 percent.
9. The method for controlling the regenerated effluent of the bipolar membrane electric-assisted deionization device according to claim 4 or 5, wherein: the regeneration flow rate is regulated by at least one of a pump variable frequency, a flow restriction orifice, or a flow regulating valve.
10. A bipolar membrane electrically assisted deionization device, comprising: the method for controlling the regenerated water of the bipolar membrane electric-assisted deionization device according to any one of claims 1 to 9.
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| JP2014069122A (en) * | 2012-09-28 | 2014-04-21 | Japan Organo Co Ltd | Desalination method, desalination apparatus, and bipolar membrane |
| CN104888870A (en) * | 2014-03-06 | 2015-09-09 | 苏州华清水处理技术有限公司 | Apparatus for electrically regenerating mixed bed ion exchange resin through bipolar membrane method |
| US20170001885A1 (en) * | 2014-02-06 | 2017-01-05 | Koninklijke Philips N.V. | A decalcifying apparatus |
| US20180354820A1 (en) * | 2017-06-07 | 2018-12-13 | ERIX Solutions, LLC | Electrochemical Ion Exchange Treatment of Fluids |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014069122A (en) * | 2012-09-28 | 2014-04-21 | Japan Organo Co Ltd | Desalination method, desalination apparatus, and bipolar membrane |
| US20170001885A1 (en) * | 2014-02-06 | 2017-01-05 | Koninklijke Philips N.V. | A decalcifying apparatus |
| CN104888870A (en) * | 2014-03-06 | 2015-09-09 | 苏州华清水处理技术有限公司 | Apparatus for electrically regenerating mixed bed ion exchange resin through bipolar membrane method |
| US20180354820A1 (en) * | 2017-06-07 | 2018-12-13 | ERIX Solutions, LLC | Electrochemical Ion Exchange Treatment of Fluids |
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