CN213416391U - Electrodialysis membrane stack cleaning device - Google Patents
Electrodialysis membrane stack cleaning device Download PDFInfo
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- CN213416391U CN213416391U CN202021146173.1U CN202021146173U CN213416391U CN 213416391 U CN213416391 U CN 213416391U CN 202021146173 U CN202021146173 U CN 202021146173U CN 213416391 U CN213416391 U CN 213416391U
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- membrane stack
- electrodialysis membrane
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Abstract
The utility model discloses an electrodialysis membrane stack belt cleaning device, include: the storage device is used for storing the cleaning liquid; an electrodialysis membrane stack comprising a first inlet and a second inlet, the storage device being in cut-off communication with the first inlet and the second inlet, respectively; the electrodialysis membrane stack is characterized in that ports are arranged at two ends of the electrodialysis membrane stack and used for electrifying when the electrodialysis membrane stack is cleaned so as to apply equidirectional electricity or reverse electricity to the electrodialysis membrane stack. The cleaning device can solve the problem of membrane surface and internal pollution, recover the membrane performance, and reduce the period of membrane replacement, thereby reducing the operating cost.
Description
Technical Field
The utility model relates to a sewage treatment field, concretely relates to electrodialysis membrane stack belt cleaning device.
Background
In the process of treating wastewater by electrodialysis, pollution of an ion exchange membrane is inevitably generated, and the pollution can be classified into surface pollution and internal pollution according to the classification of polluted parts; according to the classification of pollutants, organic pollutants and inorganic pollutants can be classified. The surface pollution can be solved by adopting acidic inorganic pollution (such as scaling site) and alkaline washing for organic pollution and cyclic cleaning, and the cleaning method has no obvious effect on the internal pollution of the ionic membrane.
The application provides an electrodialysis membrane stack belt cleaning device aims at solving the inside pollution problem of ionic membrane.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the present application provides an electrodialysis membrane stack cleaning device, including:
the storage device is used for storing the cleaning liquid;
an electrodialysis membrane stack comprising a first inlet and a second inlet, the storage device being in cut-off communication with the first inlet and the second inlet, respectively;
the electrodialysis membrane stack is characterized in that ports are arranged at two ends of the electrodialysis membrane stack and used for electrifying when the electrodialysis membrane stack is cleaned so as to apply equidirectional electricity or reverse electricity to the electrodialysis membrane stack.
Optionally, a rectifier is further included, the two poles of which are respectively connected with the ports to apply the same direction electricity or the reverse direction electricity to the electrodialysis membrane stack.
Optionally, the first inlet and outlet comprises a material, an electrode solution and a concentrated chamber inlet when the cleaning solution enters the electrodialysis membrane stack for desalination, and the second inlet and outlet comprises a material, an electrode solution and a concentrated chamber outlet when the cleaning solution enters the electrodialysis membrane stack for desalination.
Optionally, the storage device includes a first storage device and a second storage device, and the first storage device and the second storage device are used for storing one of an acidic or alkaline cleaning solution or a neutral cleaning solution, respectively.
Optionally, the storage means comprises a conical bottom wash tank.
Optionally, a filtering device is further included for filtering the cleaning liquid flowing into the electrodialysis membrane stack from the storage device.
Optionally, the precision of the filter device is less than 5 microns.
Optionally, the washing machine further comprises a washing pump for pumping the washing liquid in the storage device to the filtering device.
Optionally, the cleaning pump comprises a fluoroplastic chemical pump.
Optionally, the storage device is in disconnectable communication with the first access port and the second access port, respectively, via a switching device comprising any one or a combination of pneumatic valves or electric valves.
The cleaning device can solve the problem of membrane surface and internal pollution, recover the membrane performance, and reduce the period of membrane replacement, thereby reducing the operating cost.
Drawings
The invention is described with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of an electrodialysis membrane stack cleaning device according to an embodiment of the present application;
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
In order to provide a thorough understanding of the present invention, a detailed description will be given in the following description to illustrate the electrodialysis membrane stack cleaning apparatus of the present invention. It is apparent that the practice of the invention is not limited to the particular details known to those skilled in the art of sewage treatment. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to these detailed descriptions.
It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same elements are denoted by the same reference numerals, and thus the description thereof will be omitted.
The electrodialysis cleaning method is classified into on-line cleaning and immersion cleaning, and in view of the convenience of the cleaning method, an on-line cleaning method is often used. Electrodialysis pollution is mainly divided into inorganic pollution and organic pollution, wherein the inorganic pollution is caused by the fact that high-salinity wastewater contains a large amount of calcium and magnesium ions which react with sulfate radicals, hydroxyl radicals and carbonate radicals in a solution to form scales on the surface of an ion exchange membrane, so that voltage is increased, and normal operation is influenced. Most of the organic matters are electronegative, and are accumulated on the surface of an anion exchange membrane or enter the anion exchange membrane during the operation process of electrodialysis, so that organic pollution is caused. Ordinary acid and alkali cleaning can usually clean scales and organic deposits on the surface of the ion exchange membrane, part of scales inside the positive membrane and organic pollution inside the negative membrane cannot be solved, so that more and more pollutants are accumulated in the ion exchange membrane, and the service life of the ion exchange membrane is greatly reduced.
In order to solve the above problems, the applicant provides an electrodialysis membrane stack washing device comprising: the storage device is used for storing the cleaning liquid; an electrodialysis membrane stack comprising a first inlet and a second inlet, the storage device being in cut-off communication with the first inlet and the second inlet, respectively; and two poles of the rectifier are respectively connected with two ends of the electrodialysis membrane stack so as to apply equidirectional electricity or reverse electricity to the electrodialysis membrane stack.
Utility model people discover, among the electrodialysis operation process, the inorganic scale deposit reaction of taking place mainly concentrates on concentrated room and utmost point room, from this, utility model people think that the equidirectional circular telegram pickling can make the hydrogen ion see through the cation membrane in the pickling process, washs magnesium hydroxide or calcium hydroxide deposit that the hydroxide radical that the electrolysis that calcium magnesium meets in the migration process produced and produce, and positive membrane and the scale deposit that utmost point room surface produced can be washd with the backwash to positive washing. In addition, utility model people discover, organic matter pollutes and mainly takes place on anion exchange membrane surface (light room or material room side) or inside, and the alkali wash process makes the dark and light room exchange through reverse circular telegram, and the hydroxyl can see through the anion membrane from original dark room and migrate to light room, can wash the inside great molecular organic matter pollution of anion exchange membrane in this process, through just washing and the organic matter on backwash washing anion membrane surface. The cleaning device can solve the problem of membrane surface and internal pollution, recover the membrane performance, and reduce the period of membrane replacement, thereby reducing the operating cost.
The electrodialysis membrane stack cleaning device of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic structural diagram of an electrodialysis membrane stack cleaning device according to an embodiment of the application.
Referring to fig. 1, the utility model discloses an electrodialysis membrane stack belt cleaning device, include:
the storage device is used for storing the cleaning liquid; an electrodialysis membrane stack 5, which comprises a first inlet and a second inlet, and a storage device is respectively communicated with the first inlet and the second inlet in a stopping way; the electrodialysis membrane stack is characterized in that ports are arranged at two ends of the electrodialysis membrane stack and used for electrifying when the electrodialysis membrane stack is cleaned so as to apply equidirectional electricity or reverse electricity to the electrodialysis membrane stack.
Illustratively, a rectifier 4 is further included, and two poles of the rectifier 4 are respectively connected with two ends of the electrodialysis membrane stack 5 so as to apply the same-direction electricity or the reverse electricity to the electrodialysis membrane stack 5, although the same-direction electricity or the reverse electricity can also be applied to the electrodialysis membrane stack 5 through other electricity supplying devices.
The electrodialysis membrane stack cleaning device may comprise a filter device 5, said filter device 5 being adapted to filter cleaning liquid flowing from the storage device into the electrodialysis membrane stack 3. Illustratively, the precision of the filter device 5 is less than or equal to 5 microns. The electrodialysis membrane stack cleaning device also comprises a cleaning pump 6, and the cleaning pump 6 is used for pumping the cleaning liquid in the storage device to the filtering device. Illustratively, the cleaning pump comprises a fluoroplastic chemical pump and a fluoroplastic chemical pump, and has strong acid and alkali resistance and can reduce secondary pollution caused by corrosion.
The storage means may comprise a first storage means 1 and a second storage means 2 for storing one of an acidic or alkaline cleaning solution or a neutral cleaning solution, respectively. In one embodiment, as shown in fig. 1, a first storage device 1 stores an acidic cleaning solution, and a second storage device 2 stores an alkaline cleaning solution, and the acidic or alkaline cleaning solution can be introduced into the electrodialysis membrane stack as required by a control switch to perform cleaning. Of course, a third, fourth or more storage means may be provided as required to store the cleaning liquid.
In one example of the application, the first inlet and the second inlet are respectively communicated with the storage device in a stopping way, so that the cleaning liquid can be re-pumped into the storage device for recycling after the electrodialysis membrane stack is cleaned. As shown in fig. 1, as an example of the present application, the first inlet and outlet includes a material, an electrode solution, and a concentrated chamber inlet when the cleaning solution enters the electrodialysis membrane stack for desalination, and the second inlet and outlet includes a material, an electrode solution, and a concentrated chamber outlet when the cleaning solution enters the electrodialysis membrane stack for desalination. The inlet and the outlet are respectively communicated with the storage device in a cut-off way through a switching device, so that the cleaning solution is pumped to the storage device again for recycling after the electrodialysis membrane stack is cleaned. For example, in the acid washing process, the acidic cleaning solution after washing the electrodialysis membrane stack can be introduced into the first storage device 1, or in the alkali washing process, the alkaline cleaning solution after washing the electrodialysis membrane stack can be introduced into the second storage device 2, so as to achieve the purpose of recycling.
Illustratively, the storage device includes a conical bottom wash tank. The cleaning liquid after the electrodialysis is cleaned can be static, so that the cleaned precipitate sinks to avoid being brought into a cleaning system again.
Since the storage device is in communication with the first inlet and the second inlet and outlet, respectively, the cleaning solution in the storage device can be introduced into the electrodialysis membrane stack 5 from the first inlet for cleaning and flow out from the second inlet and outlet, i.e. forward cleaning. The cleaning liquid in the storage device can also be introduced into the electrodialysis membrane stack 5 from the second inlet and flows out from the first inlet and outlet, namely backwashing.
Illustratively, the storage device is in disconnectable communication with the first and second ports, respectively, via a switching device, all of which may comprise any one or a combination of pneumatic or electric valves. The switch on the control path is used for controlling the forward washing process or the backward washing process.
Referring to the attached drawing 1, a forward washing process is exemplified as follows, configured cleaning liquid can be injected into a first storage device 1, the pump sucks the cleaning liquid into a filter by opening or a valve, after the cleaning liquid is filtered by a 5-micron filter, the self-absorption valve is opened, the cleaning liquid enters materials, polar liquid and a dense chamber during desalination operation of a membrane stack and flows in, then the spike valve is opened, namely the cleaning liquid flows out of the membrane stack from the outlets of the materials, the polar liquid and the dense chamber during desalination operation of the membrane stack, then the satellite ⒄ or the quack valve is opened, and the cleaning liquid flows into a washing tank and is recycled. The other valves are all closed.
The pump sucks cleaning liquid into the filter by opening the valve, and after the cleaning liquid is filtered by the 5 mu m filter, the four-bit valve is opened at will, the cleaning liquid enters from the outlets of the materials, the polar liquid and the thick chambers during the membrane stack desalting operation, then the mark valve is opened, namely the materials, the polar liquid and the thick chambers during the membrane stack desalting operation flow out of the membrane stack from the inlets of the materials, the polar liquid and the thick chambers, then the mark ⒄ or the thick chambers are opened, and the marks flow into the cleaning tank for recycling. The other valves are all closed.
The backwashing step can also comprise acid washing, exemplarily, the first step is to open a valve sixteenth ⒄, the opening states of the other valves are the same as the backwashing step, the backwashing is about 15min, the same-direction electricity is applied to the rectifier 4 to carry out the acid washing for 1min during the electrodialysis operation, the circulation is carried out for 5 times, then, the forward washing is carried out for 10min, and finally, the washing is carried out for 5min by using clean water.
The backwashing step can comprise alkali washing, the third step of dividing the valve into four parts, opening states of other valves and the forward washing step, wherein the forward washing step is carried out for about 15min, reverse electric alkali washing is carried out for 30s through the rectifier 4 during the electrodialysis operation, the circulation is carried out for 10 times, then, backwashing is carried out for 10min, and finally, washing is carried out for 5min through clear water.
In conclusion, in the electrodialysis operation process, the generated inorganic scaling reaction is mainly concentrated in the concentration chamber and the polar chamber, hydrogen ions can permeate the cationic membrane by electrifying and pickling in the same direction in the pickling process, magnesium hydroxide or calcium hydroxide precipitate generated by hydroxide radicals generated by electrolysis in the membrane in the migration process of calcium and magnesium is cleaned, and the positive washing and the back washing can clean the scaling generated on the surfaces of the cationic membrane and the polar chamber. Organic matter pollution mainly occurs on the surface (a light chamber or a material chamber side) or inside an anion exchange membrane, an alkali washing process is conducted through reverse electrification, a light chamber is made to exchange, hydroxide radicals can penetrate through a negative membrane from an original heavy chamber and migrate to a light chamber, in the process, the organic matter pollution of large molecules inside the anion exchange membrane can be cleaned, and the organic matter on the surface of the negative membrane is cleaned through forward washing and backwashing. The cleaning device and the method can solve the problem of membrane surface and internal pollution, recover the membrane performance, and reduce the period of membrane replacement, thereby reducing the operating cost.
The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An electrodialysis membrane stack washing apparatus, comprising:
the storage device is used for storing the cleaning liquid;
an electrodialysis membrane stack comprising a first inlet and a second inlet, the storage device being in cut-off communication with the first inlet and the second inlet, respectively;
the electrodialysis membrane stack is characterized in that ports are arranged at two ends of the electrodialysis membrane stack and used for electrifying when the electrodialysis membrane stack is cleaned so as to apply equidirectional electricity or reverse electricity to the electrodialysis membrane stack.
2. Electrodialysis membrane stack washing apparatus according to claim 1,
and the two poles of the rectifier are respectively connected with the ports so as to apply the same-direction electricity or the reverse electricity to the electrodialysis membrane stack.
3. The electrodialysis membrane stack cleaning device according to claim 1, wherein the first inlet and outlet comprises a material, an electrode solution and a concentration chamber inlet when the cleaning solution enters the electrodialysis membrane stack for desalination, and the second inlet and outlet comprises a material, an electrode solution and a concentration chamber outlet when the cleaning solution enters the electrodialysis membrane stack for desalination.
4. Electrodialysis membrane stack washing arrangement according to claim 1, wherein the storage means comprises a first storage means and a second storage means for storing one of an acidic or alkaline washing liquid or a neutral washing liquid, respectively.
5. Electrodialysis membrane stack washing apparatus according to claim 1, wherein the storage means comprises a conical bottom wash tank.
6. The electrodialysis membrane stack washing device according to claim 1, further comprising a filtering device for filtering the washing liquid flowing into the electrodialysis membrane stack from the storage device.
7. Electrodialysis membrane stack washing apparatus according to claim 6, wherein the precision of the filtration apparatus is less than 5 microns.
8. Electrodialysis membrane stack washing device according to claim 6, further comprising a washing pump for pumping washing liquid in the storage device to the filtration device.
9. An electrodialysis membrane stack washing device according to claim 8, wherein said washing pump comprises a fluoroplastic chemical pump.
10. Electrodialysis membrane stack washing device according to claim 1, wherein the storage device is in disconnectable communication with the first and second ports, respectively, by means of a switching device comprising any one or a combination of pneumatic or electric valves.
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| CN202021146173.1U CN213416391U (en) | 2020-06-18 | 2020-06-18 | Electrodialysis membrane stack cleaning device |
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| CN202021146173.1U CN213416391U (en) | 2020-06-18 | 2020-06-18 | Electrodialysis membrane stack cleaning device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11502322B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
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2020
- 2020-06-18 CN CN202021146173.1U patent/CN213416391U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11502322B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11563229B1 (en) | 2022-05-09 | 2023-01-24 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11611099B1 (en) | 2022-05-09 | 2023-03-21 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11699803B1 (en) | 2022-05-09 | 2023-07-11 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
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