CN112679001A - Membrane-free electrodeionization continuous water production system based on equivalent filter elements - Google Patents
Membrane-free electrodeionization continuous water production system based on equivalent filter elements Download PDFInfo
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- CN112679001A CN112679001A CN202011475599.6A CN202011475599A CN112679001A CN 112679001 A CN112679001 A CN 112679001A CN 202011475599 A CN202011475599 A CN 202011475599A CN 112679001 A CN112679001 A CN 112679001A
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Abstract
The invention discloses a membraneless electrodeionization continuous water production system based on equivalent filter elements. The membrane-free electrodeionization device comprises two or more membrane-free electrodeionization devices with the same structure and based on equivalent filter elements, each membrane-free electrodeionization device based on the equivalent filter elements comprises a shell and a cover plate, the shell and the cover plate form a hollow accommodating space, the hollow accommodating space is sequentially provided with an anode, a double-headed screw, a cathode and an annular water distributor from inside to outside, mixed ion exchange resin is filled in the annular water distributor, a pressing plate is arranged at the lower end of the annular water distributor, a filter element port is arranged at the upper end of the anode, a first through hole is formed in the upper end of the shell, a conductive screw is arranged in the first through hole, and a high-purity water inlet/outlet is formed in the side surface of. The invention overcomes the problems of environmental pollution, high labor intensity, troublesome operation and low automation degree of the mixed bed chemical regeneration. It is suitable for the preparation of high-purity water, the purification of wastewater containing heavy metal ions such as electroplating rinsing and the like, and other water and wastewater treatment aiming at removing ionic impurities.
Description
Technical Field
The invention relates to the technical field of pure water preparation, in particular to a membrane-free electrodeionization continuous water preparation system based on equivalent filter elements.
Background
In the production process of industries such as electric power, semiconductor, medicine, chemical industry and the like, a large amount of high-purity water is often consumed. The preparation of high purity water successively goes through the third generation treatment process at home and abroad. The first generation is "pretreatment + ion exchange", where pretreatment is used primarily to remove colloids and fine suspended particles, and ion exchange is used to remove ionic impurities. The ion exchange as the first generation core has high purification efficiency, but the operation is troublesome, the labor intensity is high, and a large amount of acid-base wastewater is generated in the regeneration process, which is not beneficial to environmental protection. The second generation process is 'pretreatment + membrane separation + ion exchange', and most of soluble impurities in water can be removed by the membrane separation, so that the regeneration times of the ion exchange are obviously reduced, and the labor intensity and the acid-base wastewater generation amount are greatly reduced. The third generation technology of 'pretreatment + membrane separation + EDI' is born. EDI fully exerts the technical characteristics of ion exchange and electrodialysis, has high treatment efficiency, does not need chemical regeneration, is environment-friendly and is simple and convenient to operate. However, the EDI has the problems of complex device structure, high manufacturing cost, difficult maintenance, easy film pollution in the operation process and the like.
In recent years, the EDI technology has a new breakthrough. An issued patent (patent number ZL200710159006.3) describes a membrane-free ion exchange resin electroregeneration process based on equivalent cartridge electrodes. In principle, the electric regeneration reactor of the membraneless ion exchange resin based on the equivalent filter element electrode utilizes OH < - > and H < + > generated by electrode reaction and water dissociation to recover and regenerate ineffective mixed bed ion exchange resin, chelating resin and the like, and avoids the defects of membrane blockage, scaling and the like caused by the property of the membrane because an expensive ion exchange membrane is saved. On the basis, an authorized patent (patent number ZL202020570621.4) develops a membraneless ion exchange resin electric regeneration device based on a filter element electrode, further optimizes the structure of the device, effectively solves the problems of hydraulic bias flow and cathode scaling, and has wide market application prospect in the field of industrial water supply and deep desalination of sewage.
However, the current devices developed above suffer from the following drawbacks: 1. only can intermittently run, can not continuously produce water, and is difficult to realize industrial application. 2. In the practical application process, the problems of short-circuit discharge and the like caused by too small distance between the male and female electrode binding posts occur, and the structure of the device needs to be further optimized. In view of the foregoing, it is desirable to provide an integrated device and system with optimized device structure that can continuously stabilize water production.
Disclosure of Invention
The invention provides a membraneless electrodeionization continuous water production system based on an equivalent filter element, which solves the problem that continuous water production cannot be realized in the prior art.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the system at least comprises two identical-structure membraneless electrodeionization devices based on identical filter elements, each membraneless electrodeionization device based on identical filter elements comprises a shell and a cover plate, the shell and the cover plate form a hollow accommodating space, the hollow accommodating space is sequentially provided with an anode, a double-headed screw, a cathode and an annular water distributor from inside to outside, mixed ion exchange resin is filled in the annular water distributor, the lower end of the annular water distributor is provided with a pressing plate, the upper end of the anode is provided with a filter element port, the upper end of the shell is provided with a first through hole, a conductive screw is arranged in the first through hole, and the side surface of the shell is provided with a high-purity water inlet/outlet.
Preferably, the outer surface of the cathode is covered with filter cloth, and the aperture of the filter cloth is 0.05-0.1 mm.
Preferably, the lower surface of the pressing plate is fixed at one end of a double-threaded screw rod through a pressing plate nut, and the other end of the double-threaded screw rod is fixed in an embedded nut embedded in the shell.
Preferably, the cover plate and the shell are fixed by a cover plate screw rod and a cover plate nut.
Preferably, the anode is fixed by an anode fixing nut on the upper end face of the shell, the conductive screw is fixed by a conductive screw fixing nut on the upper end face of the shell, and the conductive screw is connected with the cathode.
Preferably, an inner sealing ring is arranged between the pressure plate and the annular water distributor; an outer sealing ring is arranged between the cover plate and the shell.
Preferably, the anode is a ruthenium-iridium-titanium-coated electrode, the anode is arranged at the position of the longitudinal central axis of the cathode, the cathode is a cylindrical annular porous net, and the aperture is 0.2-1.0 mm.
Preferably, the mixed ion exchange resin is single-layer filled with strong acid and strong base mixed resin, or double-layer filled with strong acid and strong base mixed resin and weak acid and strong base mixed resin, or double-layer filled with strong acid and strong base mixed resin and strong acid and weak base mixed resin, or three-layer filled with strong acid and strong base mixed resin, weak acid and strong base mixed resin and strong acid and weak base mixed resin.
Preferably, the housing is made of glass reinforced plastic or steel-lined plastic.
The invention provides a membraneless electrodeionization continuous water making system based on equivalent filter elements, which consists of two or more membraneless electrodeionization devices with the same structure based on equivalent filter elements, wherein the filter element port of each device is connected with a raw water/concentrated water two-way valve, the other end of the raw water/concentrated water two-way valve is connected with a raw water inlet two-way automatic valve and a concentrated water outlet two-way automatic valve, the other end of the raw water inlet two-way automatic valve is connected with a raw water pipe, the raw water pipe is connected with a raw water pump, the raw water pump is connected with a raw water tank, and the other end of the concentrated water outlet two-way automatic valve is connected with a concentrated water pipe; the high-purity water inlet/outlet at the left lower side of the side edge of each device is connected with a high-purity water inlet/outlet two-way valve, the other end of the high-purity water inlet/outlet two-way valve is connected with a high-purity water outlet two-way automatic valve and a high-purity water inlet two-way automatic valve, the other end of the high-purity water outlet two-way automatic valve is connected with a high-purity water outlet pipe, and the other end of the high-purity water inlet two-way automatic valve is connected with a.
The invention has the beneficial effects that:
1. because the mixed ion exchange resin is adopted for regenerating and using electricity, no chemical reagent is needed, thereby reducing the discharge of a large amount of acid-base wastewater and being green and environment-friendly;
2. the regeneration and water treatment of the mixed ion exchange resin are carried out in the same equipment, so that the resin loss is avoided, the operation is simple, and the labor intensity is low;
3. the invention further optimizes the structure of the device, and the adopted integrated system can continuously and stably prepare high-purity water;
4. the invention is suitable for the purification of wastewater containing heavy metal ions, such as the preparation of high-purity water, electroplating rinsing and the like, and the treatment of other water and wastewater aiming at removing ionic impurities.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of the device of the present invention.
FIG. 2 is a top view of the apparatus of the present invention.
FIG. 3 is a schematic diagram of the system of the present invention.
The reference numbers illustrate:
1. a housing; 2. a high purity water inlet/outlet 3, a cathode; 4. filtering cloth; 5. an anode; 6. an anode fixing nut; 7. mixing ion exchange resin; 8. an annular water distributor; 9. a double-ended screw; 10. embedding a nut; 11. a filter element port; 12. a conductive screw; 13. the conductive screw rod is fixed with the nut; 14. a platen nut; 15. a cover plate; 16. pressing a plate; 17. an inner seal ring; 18. an outer sealing ring; 19. a cover plate screw rod; 20. a cover plate nut; 21. a raw water/concentrated water two-way valve; 22. the raw water enters the two-way automatic valve; 23. the concentrated water outlet two-way automatic valve; 24. a high purity water inlet/outlet two-way valve; 25. a high-purity water outlet two-way automatic valve; 26. the high-purity water inlet two-way automatic valve; 27. a raw water tank; 28. a raw water pump; 29. a concentrated water pipe; 30. a raw water pipe; 31. a high-purity water outlet pipe; 32. a high-purity water inlet pipe; 33. a high-purity water tank; 34. a high-purity water pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: the utility model provides a continuous water preparation system of no membrane electrodeionization based on equate filter core, this system include two the same no membrane electrodeionization device based on equate filter core of structure at least, the structure of every no membrane electrodeionization device based on equate filter core is as shown in fig. 1, fig. 2, including casing 1 and apron 15, and casing 1 uses glass steel or steel lining plastics, and apron 15 is fixed and install outer seal ring 18 with casing 1 with apron screw rod 19 and apron nut 20. The shell 1 and the cover plate 15 form a hollow accommodating space, the hollow accommodating space is sequentially provided with an anode 5, a double-headed screw 9, a cathode 3 and an annular water distributor 8 from inside to outside, mixed ion exchange resin 7 is filled in the annular water distributor 8 and is filled in a single layer by strong acid and strong base mixed resin, or the double-layer filling of strong acid and strong base mixed resin, weak acid and strong base mixed resin or the double-layer filling of strong acid and strong base mixed resin, strong acid and weak base mixed resin, or the three-layer filling of strong acid and strong base mixed resin, weak acid and strong base mixed resin and strong acid and weak base mixed resin. The annular water distributor 8 is uniformly distributed with small holes with the aperture of 3mm and the interval of 10mm, the lower end of the annular water distributor 8 is provided with a pressure plate 16, and an inner sealing ring 17 is arranged between the pressure plate 16 and the annular water distributor 8. The lower surface of the pressure plate 16 is fixed with one end of a double-thread screw 9 by a pressure plate nut 14, and the other end of the double-thread screw 9 is fixed with an embedded nut 10 embedded in the shell 1. The cathode 3 is a cylindrical annular porous titanium net with the aperture of 0.2-1.0 mm, and the outer surface of the cathode 3 is covered with filter cloth 4 with the aperture of 0.05-0.1 mm. The anode 5 is a ruthenium-iridium-coated titanium electrode, is arranged at the longitudinal central axis position of the cathode 3 and is fixed on the upper end surface of the shell 1 by an anode fixing nut 6, and the upper end of the anode 5 is a filter element port 11. The upper end of the shell is provided with a first through hole, a conductive screw 12 is arranged in the first through hole, the conductive screw 12 is fixed on the upper end surface of the shell 1 by an electric screw fixing nut 13, the other end of the conductive screw 12 is connected with the cathode 3, and the side surface of the shell 1 is provided with a high-purity water inlet/outlet 2.
The single device of the invention adopts intermittent operation, and the treatment and the regeneration are carried out alternately. During treatment, water flow enters the mixed ion exchange resin 7 from the filter element port 11 through the titanium filter element anode 5, and ionic substances in raw water are effectively removed under the action of the mixed ion exchange resin 7; the purified water sequentially passes through the cathode 3, the filter cloth 4 and the annular water distributor 8 and then flows out from the high-purity water inlet/outlet 2.
During regeneration, a direct current power supply supplies power to the titanium filter element, water dissociation on the anode 5 and the cathode 3 of the titanium filter element and water ionization on an ion exchange resin interface are utilized to generate a large amount of H + and OH-ions, the generated H + and OH-ions are utilized to regenerate the failed ion exchange resin, so that the failed ion exchange resin is converted into an RH type or an ROH type, and meanwhile, high-purity water enters from a high-purity water inlet/outlet 22 and sequentially passes through the annular water distributor 8, the filter cloth 4, the cathode 3 and the mixed ion exchange resin 7; the regenerated ions enter the water and flow into the titanium filter core anode 5 along with the regenerated water flow, and are finally discharged from the titanium filter core port 11.
As shown in fig. 3, the present invention provides a membraneless electrodeionization continuous water production system based on equivalent filter elements, which comprises two or more membraneless electrodeionization devices with the same structure based on equivalent filter elements, wherein a filter element port 11 of each device is connected with a raw water/concentrated water two-way valve 21, the other end of the raw water/concentrated water two-way valve 21 is connected with a raw water inlet two-way automatic valve 22 and a concentrated water outlet two-way automatic valve 23, wherein the other end of the raw water inlet two-way automatic valve 22 is connected with a raw water pipe 30, the raw water pipe 30 is connected with a raw water pump 28, the raw water pump 28 is connected with a raw water tank 27, and the other end of the concentrated water outlet two-way automatic valve 23 is connected with a concentrated water pipe; the high purity water inlet/outlet 2 at the left lower side of each device is connected with a high purity water inlet/outlet two-way valve 24, the other end of the high purity water inlet/outlet two-way valve 24 is connected with a high purity water outlet two-way automatic valve 25 and a high purity water inlet two-way automatic valve 26, wherein the other end of the high purity water outlet two-way automatic valve 25 is connected with a high purity water outlet pipe 31, and the other end of the high purity water inlet two-way automatic valve 26 is connected with a high purity water inlet pipe 32.
Examples
The devices in the system are regenerated in turn, namely after the 1 st device fails, the raw water inlet two-way automatic valve 22 on the filter element port 11 of the 1 st device and the high-purity water outlet two-way automatic valve 25 below the left side are closed, the concentrated water outlet two-way automatic valve 23 on the filter element port 11 of the 1 st device and the high-purity water inlet two-way automatic valve 26 below the left side are opened simultaneously, the high-purity water pump 34 is started, high-purity water in the high-purity water tank 33 is pumped into the 1 st device, the direct-current power supply is started simultaneously, the 1 st device is electrically regenerated, and the rest devices are in a treatment state; after the 1 st device is regenerated, the 2 nd device is regenerated, and the rest devices are in a processing state, and so on. Thus, water production can be continuously performed. The normally open raw water/concentrated water two-way valve 21 and the high-purity water inlet/outlet two-way valve 24 are manual valves, and are mainly used for isolating each device from a system so as to overhaul the device. The two-way automatic valve is an automatic valve such as a pneumatic valve, an electric valve, an electromagnetic valve and the like. The two-way automatic valves can also be replaced by 1 three-way automatic valve. The switching between the treatment process and the regeneration process adopts automatic control and automatic operation. The system uses two DC power supplies, one for each use and one for each standby. When water is produced in a large scale, a plurality of the electric mixed bed integrated systems which are mutually independent and run in parallel can be adopted.
The secondary reverse osmosis effluent having a conductivity of about 5. mu.s/cm was treated using the treatment apparatus shown in FIG. 1. The water inlet flow rate is about 800L/h during the treatment, the water outlet conductivity is 0.090 mu s/cm after the treatment time is about 160 minutes, and the treatment is finished. And (3) electrically regenerating the failed mixed ion exchange resin, wherein the regeneration voltage is 80V, the regeneration current is 7.0-9.0A, the regeneration time is 10 minutes, the regeneration flow is 600L/h, the average conductivity of the regeneration liquid is 173 mu s/cm, and the water recovery rate is 95.3%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a continuous water preparation system of no membrane electrodeionization based on equate filter core which characterized in that: the system at least comprises two membraneless electrodeionization devices with the same structure based on equivalent filter elements, wherein each membraneless electrodeionization device based on equivalent filter elements comprises a shell (1) and a cover plate (15), the shell (1) and the cover plate (15) form a hollow accommodating space, the hollow accommodating space is sequentially provided with an anode (5), a double-headed screw (9), a cathode (3) and an annular water distributor (8) from inside to outside, the annular water distributor (8) is filled with mixed ion exchange resin (7), the lower end of the annular water distributor (8) is provided with a pressing plate (16), the upper end of the anode (5) is a filter element port (11), the upper end of the shell is provided with a first through hole, the first through hole is internally provided with a conductive screw (12), and the side face of the shell (1) is provided with a high purity water inlet/outlet (2).
2. The membraneless electrodeionization continuous water production system based on equivalent filter elements as claimed in claim 1, wherein: the outer surface of the cathode (3) is covered with a filter cloth (4), and the aperture of the filter cloth (4) is 0.05-0.1 mm.
3. The membraneless electrodeionization continuous water production system based on equivalent filter elements as claimed in claim 1, wherein: the lower surface of the pressing plate (16) is fixed with one end of a double-thread screw (9) through a pressing plate nut (14), and the other end of the double-thread screw (9) is fixed with an embedded nut (10) embedded in the shell (1).
4. The membraneless electrodeionization continuous water production system based on equivalent filter elements as claimed in claim 1, wherein: the cover plate (15) and the shell (1) are fixed through a cover plate screw rod (19) and a cover plate nut (20).
5. The membraneless electrodeionization continuous water production system based on equivalent filter elements as claimed in claim 1, wherein: the anode (5) is fixed by an anode fixing nut (6) on the upper end face of the shell (1), the conductive screw (12) is fixed by a conductive screw fixing nut (13) on the upper end face of the shell (1), and the conductive screw (12) is connected with the cathode (3).
6. The membraneless electrodeionization continuous water production system based on equivalent filter elements as claimed in claim 1, wherein: an inner sealing ring (17) is arranged between the pressure plate (16) and the annular water distributor (8); an outer sealing ring (18) is arranged between the cover plate (15) and the shell (1).
7. The membraneless electrodeionization continuous water production system based on equivalent filter elements as claimed in claim 1, wherein: the anode (5) and the cathode (3) are ruthenium-iridium-coated titanium electrodes, the anode (5) is arranged at the position of the longitudinal central axis of the cathode (3), the cathode (3) is a cylindrical annular porous net, and the aperture is 0.2-1.0 mm.
8. The membraneless electrodeionization continuous water production system based on equivalent filter elements as claimed in claim 1, wherein: the mixed ion exchange resin (7) is filled by a strong acid and strong base mixed resin in a single layer, or by a strong acid and strong base mixed resin and a weak acid and strong base mixed resin in a double layer, or by a strong acid and strong base mixed resin and a strong acid and weak base mixed resin in a double layer, or by a strong acid and strong base mixed resin, a weak acid and strong base mixed resin and a strong acid and weak base mixed resin in a three-layer manner.
9. The membraneless electrodeionization continuous water production system based on equivalent filter elements as claimed in claim 1, wherein: the shell (1) is made of glass fiber reinforced plastics or steel-lined plastics.
10. A kind of membraneless electrodeionization continuous water making system based on equivalent filter element, it is made up of membraneless electrodeionization apparatus based on equivalent filter element that two or more structure are the same, the filter element port (11) of each apparatus connects with raw water/dense water two-way valve (21), another end of the raw water/dense water two-way valve (21) connects with raw water and enters two-way automatic valve (22) and dense water and goes out two-way automatic valve (23), wherein another end that the raw water enters two-way automatic valve (22) links with raw water pipe (30), the raw water pipe (30) links with raw water pump (28), the raw water pump (28) links with raw water tank (27), another end that the dense water goes out two-way automatic valve (23) links with dense water pipe (29); the high-purity water inlet/outlet (2) at the left lower side of the side edge of each device is connected with a high-purity water inlet/outlet two-way valve (24), the other end of the high-purity water inlet/outlet two-way valve (24) is connected with a high-purity water outlet two-way automatic valve (25) and a high-purity water inlet two-way automatic valve (26), the other end of the high-purity water outlet two-way automatic valve (25) is connected with a high-purity water outlet pipe (31), and the other end of the high-purity water inlet two-way automatic valve (26) is connected with a high-purity water.
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| CN202011475599.6A CN112679001A (en) | 2020-12-14 | 2020-12-14 | Membrane-free electrodeionization continuous water production system based on equivalent filter elements |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114212914A (en) * | 2021-12-14 | 2022-03-22 | 宁波职业技术学院 | Method and system for recycling petrochemical wastewater |
| CN114632554A (en) * | 2022-02-25 | 2022-06-17 | 万先凯 | Powder resin film-free electric deionization device and working process thereof |
-
2020
- 2020-12-14 CN CN202011475599.6A patent/CN112679001A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114212914A (en) * | 2021-12-14 | 2022-03-22 | 宁波职业技术学院 | Method and system for recycling petrochemical wastewater |
| CN114212914B (en) * | 2021-12-14 | 2023-05-05 | 宁波职业技术学院 | Petrochemical wastewater recycling method and system |
| CN114632554A (en) * | 2022-02-25 | 2022-06-17 | 万先凯 | Powder resin film-free electric deionization device and working process thereof |
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