CN108298644B - High-efficient waste water salt separation concentration desalination integrated device - Google Patents
High-efficient waste water salt separation concentration desalination integrated device Download PDFInfo
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- CN108298644B CN108298644B CN201810215241.6A CN201810215241A CN108298644B CN 108298644 B CN108298644 B CN 108298644B CN 201810215241 A CN201810215241 A CN 201810215241A CN 108298644 B CN108298644 B CN 108298644B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 55
- 150000003839 salts Chemical class 0.000 title claims abstract description 29
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 26
- 238000000926 separation method Methods 0.000 title claims abstract description 18
- 239000013505 freshwater Substances 0.000 claims abstract description 195
- 239000012528 membrane Substances 0.000 claims abstract description 151
- 239000003011 anion exchange membrane Substances 0.000 claims abstract description 15
- 238000005341 cation exchange Methods 0.000 claims abstract description 14
- 238000011033 desalting Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 165
- 239000000243 solution Substances 0.000 abstract description 54
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 abstract description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract description 5
- 239000001110 calcium chloride Substances 0.000 abstract description 5
- 229910001628 calcium chloride Inorganic materials 0.000 abstract description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 abstract description 5
- 235000011152 sodium sulphate Nutrition 0.000 abstract description 5
- 239000012267 brine Substances 0.000 abstract description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 4
- 239000003814 drug Substances 0.000 abstract description 2
- 239000012141 concentrate Substances 0.000 description 30
- 238000000034 method Methods 0.000 description 20
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 150000001768 cations Chemical class 0.000 description 8
- 238000000909 electrodialysis Methods 0.000 description 8
- 150000001450 anions Chemical class 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 6
- 229910001415 sodium ion Inorganic materials 0.000 description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 5
- 229910001424 calcium ion Inorganic materials 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- 239000004902 Softening Agent Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- -1 chloride Chemical class 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000003014 ion exchange membrane Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003010 cation ion exchange membrane Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/46—Apparatus therefor
- B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
-
- 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
- C02F1/4604—Treatment of water, waste water, or sewage by electrochemical methods for desalination of seawater or brackish water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
Abstract
The embodiment of the invention provides a high-efficiency wastewater salt separation, concentration and desalination integrated device, which comprises: a first membrane stack area and a second membrane stack area, wherein the first membrane stack area is provided with a cathode pole chamber, a concentrated solution circulating pipeline a, a fresh water circulating pipeline a and a plurality of membrane pairs a; the second membrane stack area is provided with an anode chamber, a concentrated solution circulating pipeline b, a fresh water circulating pipeline b and a multi-membrane pair b; a fresh water tank a is arranged on the fresh water circulation pipeline a, and a fresh water tank b is arranged on the fresh water circulation pipeline b; a middle fresh water chamber is arranged between the first membrane stack region and the second membrane stack region; the membrane pair a comprises a cation exchange membrane and a selective anion exchange membrane; the membrane pair b includes an anion exchange membrane and a selective cation exchange membrane. The device can separate the strong brine easy to scale into the calcium chloride concentrated solution and the sodium sulfate concentrated solution without scaling, and does not need to add sodium carbonate to soften the strong brine, thereby saving the cost of the medicament; and desalting the wastewater while classifying the salt, so as to realize the desalination of strong brine.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a high-efficiency wastewater salt separation, concentration and desalination integrated device.
Background
Waste water from desulfurization processes in power plants, waste water from coal chemical production processes, and waste water from tail water from mine operations, are typically rich in non-carbonates, such as sodium chloride, calcium sulfate, magnesium sulfate, and the like, especially with the highest levels of calcium sulfate. Calcium sulfate generally exists in the wastewater in an ionic form, so that the hardness of the wastewater is higher, and calcium sulfate is a main substance which causes equipment scaling, and when equipment scaling, normal operation of the equipment is easily affected, so that the hardness of the wastewater needs to be reduced, and equipment scaling is avoided.
The existing method for reducing the hardness of the wastewater usually adopts a lime softening method, wherein a softening agent such as sodium carbonate (sodium carbonate) is added into the wastewater containing calcium sulfate to combine carbonate with calcium ions in the wastewater to generate precipitate, so that the concentration of the calcium ions in the wastewater is reduced, and the aim of reducing the hardness is fulfilled. However, this method requires consumption of a large amount of softening agent, resulting in high wastewater treatment costs.
Disclosure of Invention
The embodiment of the invention aims to provide a high-efficiency wastewater salt separation, concentration and desalination integrated device so as to solve the problem of high treatment cost of the existing method for reducing the hardness of wastewater. The specific technical scheme is as follows:
the embodiment of the invention provides a high-efficiency wastewater salt separation, concentration and desalination integrated device, which comprises: the membrane reactor comprises a first membrane reactor area and a second membrane reactor area, wherein the first membrane reactor area is provided with a cathode pole chamber, a concentrated solution circulating pipeline a, a fresh water circulating pipeline a and a plurality of membrane pairs a which are arranged side by side; the second membrane stack area is provided with an anode pole chamber, a concentrated solution circulating pipeline b, a fresh water circulating pipeline b and a plurality of side-by-side membrane pairs b; a fresh water tank a is arranged on the fresh water circulation pipeline a, a fresh water tank b is arranged on the fresh water circulation pipeline b, and the fresh water tank a and the fresh water tank b are symmetrically arranged; an intermediate fresh water chamber is arranged between the first membrane stack region and the second membrane stack region, and the fresh water circulation pipeline a and the fresh water circulation pipeline b are communicated through the intermediate fresh water chamber; the membrane pair a comprises a cation exchange membrane and a selective anion exchange membrane; the membrane pair b includes an anion exchange membrane and a selective cation exchange membrane.
Optionally, the fresh water tank a and the fresh water tank b are symmetrically arranged on the left and right sides by taking a central line between the first membrane stack area and the second membrane stack area as an axis.
Optionally, the water inlet of the fresh water tank a is communicated with the water outlet of the fresh water chamber in the membrane pair a through a pipeline; the water outlet of the fresh water tank a is communicated with the water inlet of the fresh water chamber in the membrane pair a through a pipeline; the water inlet of the fresh water tank b is communicated with the water outlet of the fresh water chamber in the membrane pair b through a pipeline; and the water outlet of the fresh water tank b is communicated with the water inlet of the fresh water chamber in the membrane pair b through a pipeline.
Optionally, the water inlets of the middle fresh water chamber are respectively communicated with the water outlets of the fresh water tank a and the fresh water tank b through pipelines; and the water outlet of the middle fresh water chamber is respectively communicated with the water inlets of the fresh water tank a and the fresh water tank b through pipelines.
Optionally, a fresh water outlet a is arranged on the fresh water circulation pipeline a 5; the fresh water circulation pipeline b is provided with a fresh water outlet b.
Optionally, a concentrate tank a is arranged in the concentrate circulation pipeline a, a water inlet of the concentrate tank a is communicated with a water outlet of the concentrate chamber in the membrane pair a through a pipeline, and a water outlet of the concentrate tank a is communicated with a water inlet of the concentrate chamber in the membrane pair a through a pipeline.
Optionally, a concentrated solution outlet a is arranged on a pipeline, wherein the water inlet of the concentrated solution tank a is communicated with the concentrated solution chamber outlet in the membrane pair a.
Optionally, a concentrate tank b is arranged in the concentrate circulation pipeline b, a water inlet of the concentrate tank b is communicated with a water outlet of the concentrate chamber in the membrane pair b through a pipeline, and a water outlet of the concentrate tank b is communicated with a water inlet of the concentrate chamber in the membrane pair b through a pipeline.
Optionally, a concentrated solution outlet b is arranged on a pipeline, wherein the water inlet of the concentrated solution tank b is communicated with the concentrated solution chamber outlet in the membrane pair b.
Optionally, the device further comprises a polar water tank a and a polar water tank b, wherein the water inlet of the polar water tank a is communicated with the water outlet of the cathode polar chamber through a pipeline, and the water outlet of the polar water tank a is communicated with the water inlet of the cathode polar chamber through a pipeline; the water inlet of the polar water tank b is communicated with the water outlet of the anode polar chamber through a pipeline, and the water outlet of the polar water tank b is communicated with the water inlet of the anode polar chamber through a pipeline.
According to the high-efficiency wastewater salt separation, concentration and desalination integrated device provided by the embodiment of the invention, when high-hardness wastewater is softened, a softening agent is not required to be added, so that the agent consumption is saved, and the wastewater treatment cost is reduced; because the membrane stack areas are arranged, each membrane stack area is provided with a fresh water and concentrated water circulating pipeline, the desalination of raw water and high-magnification concentration and decrement can be realized, and the desalination treatment is carried out on the raw water, so that the concentrated brine is desalted; and through all setting up a fresh water circulation pipeline and fresh water tank at every membrane heap subregion, not only can add waste water to the membrane heap simultaneously, can also reduce the circulation path length in the fresh water circulation pipeline by a wide margin, make waste water pass through the membrane pair more times in the unit time, when reducing this device running cost, can also improve desalination efficiency. Of course, it is not necessary for any one product or method of practicing the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic structural diagram of an integrated device for efficient wastewater salt separation, concentration and desalination according to an embodiment of the present invention.
In the figure, a first membrane stack area, a second membrane stack area, a cathode electrode chamber, a concentrated solution circulating pipeline a, a fresh water circulating pipeline a, a membrane pair a, a anode electrode chamber, a concentrated solution circulating pipeline b, a fresh water circulating pipeline b, a membrane pair b, a fresh water tank a, a fresh water tank b, a middle fresh water tank, a fresh water outlet and a fresh water outlet respectively, wherein the fresh water tank a, the concentrated solution tank b, the concentrated solution tank 18, the concentrated solution water outlets a and 19, the concentrated solution water outlets b and 20, the polar water tank a and the polar water tank b are respectively.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The current method for reducing the hardness of the wastewater can also adopt an electrodialysis method, and the electrodialysis principle is utilized to directionally migrate ions in the wastewater through a selective ion exchange membrane, so that the purpose of separating certain ions in the wastewater from the wastewater is achieved. The conventional electrodialysis device is generally provided with a fresh water tank at one side of the device, after wastewater is injected into the fresh water tank, the wastewater sequentially flows into each membrane pair of the electrodialysis device from near to far through a fresh water circulation pipeline, flows out of each membrane pair, flows into the fresh water tank after converging through a pipeline, can only realize concentration and desalination of salt, and cannot realize selective separation of salt. In addition, since only one fresh water tank is arranged, the wastewater can only enter each membrane pair of the electrodialysis device from one side of the circulating pipeline
As shown in FIG. 1, the embodiment of the invention provides an integrated device for separating, concentrating and desalting high-efficiency wastewater salt, which can comprise:
a first membrane stack zone 1 and a second membrane stack zone 2. The first membrane stack area 1 is provided with a cathode pole chamber 3, a fresh water chamber a, a concentrated solution circulating pipeline a4, a fresh water circulating pipeline a5 and a plurality of membrane pairs a6 which are arranged side by side, and it is to be noted that only part of the membrane pairs a6 are shown in fig. 1, and in practical application, the number of the membrane pairs a6 can be increased or decreased according to wastewater treatment requirements; the second membrane stack region 2 is provided with an anode chamber 7, a fresh water chamber b, a concentrated liquid circulation pipeline b8, a fresh water circulation pipeline b9 and a plurality of parallel membrane pairs b10, and it should be noted that only part of the membrane pairs b10 are shown in fig. 1, and in practical application, the number of the membrane pairs b10 can be increased or decreased according to wastewater treatment requirements. The membrane pairs may be secured by existing hydraulic fastening means, which are not described in detail herein. The fresh water circulation pipeline a5 is used for fresh water circulation of the first membrane reactor zone 1, and the fresh water circulation pipeline b9 is used for fresh water circulation of the second membrane reactor zone 2. In the embodiment of the invention, the membrane stacks are arranged in the partition mode, and fresh water and concentrated water circulate in the respective partition modes, so that the half of the original circulation path length can be reduced at most, and wastewater can pass through the membrane pairs more times in unit time, thereby improving the desalination efficiency.
The fresh water circulation pipeline a5 is provided with a fresh water tank a11, the fresh water circulation pipeline b9 is provided with a fresh water tank b12, the fresh water tank a11 and the fresh water tank b12 are symmetrically arranged, and specifically, the fresh water tank a11 and the fresh water tank b12 are symmetrically arranged left and right by taking a central line between the first membrane stack area 1 and the second membrane stack area 2 as an axis. The existing electrodialysis device only has one set of fresh water circulation pipeline, so that two fresh water tanks are not needed, but after the waste water is added from the fresh water tanks, the waste water can only enter each membrane pair of the electrodialysis device in sequence from one side of the circulation pipeline, and the problem of long circulation period is also caused. In the embodiment of the invention, by arranging the two symmetrical fresh water tanks, the water inlet pressure of the two sets of fresh water circulation pipelines is easier to reach balance, and the waste water can be added into the fresh water tank a11 and the fresh water tank b12 at the same time, and the waste water in the two fresh water tanks circulates through the fresh water circulation pipeline a5 and the fresh water circulation pipeline b9 respectively, so that the circulation times of the waste water in unit time can be greatly improved, and the desalination efficiency is improved.
In the embodiment of the invention, the membrane pair a6 in the first membrane stack region 1 and the membrane pair b10 in the second membrane stack region 2 form the whole membrane stack system. The membrane pair a6 includes a cation exchange membrane and a selective anion exchange membrane, and specifically, a selective anion exchange membrane may be disposed between two cation exchange membranes to constitute one membrane pair a6. Wherein, the cation exchange membrane refers to a selective permeable membrane capable of transmitting cations and intercepting anions; by selective anion exchange membrane is meant a permselective membrane capable of selectively passing monovalent anions, such as chloride, and capable of trapping divalent or higher anions, such as sulfate and other cations. The wastewater enters a fresh water circulation pipeline a5 through a fresh water tank a11 and is conveyed to a fresh water chamber of a membrane pair a6 through a water pump, cations continuously migrate towards a cathode direction under the action of current, anions continuously migrate towards an anode direction, chloride ions in the fresh water chamber continuously migrate towards a concentrated water chamber under the action of a selective anion exchange membrane, and sulfate radicals are trapped in the fresh water chamber. The chloride ions in the concentrated water chamber are continuously increased, and the chloride ions exist in the concentrated water chamber in the forms of calcium chloride and sodium chloride and are continuously and circularly accumulated through the concentrated solution circulating pipeline a 4.
The membrane pair b10 includes an anion exchange membrane and a selective cation exchange membrane, and specifically, one selective cation exchange membrane may be disposed between two anion exchange membranes to constitute one membrane pair b10. Wherein, the anion exchange membrane refers to a selective permeable membrane capable of permeating anions and intercepting cations; by selective cation exchange membrane is meant a permselective membrane capable of selectively passing monovalent cations, such as sodium ions, and capable of trapping divalent or higher cations, such as calcium ions and other anions. The wastewater enters a fresh water circulation pipeline b9 through a fresh water tank b12 and is conveyed to a fresh water chamber of a membrane pair b10 through a water pump, cations continuously migrate towards a cathode direction under the action of current, anions continuously migrate towards an anode direction, sodium ions in the fresh water chamber continuously migrate towards a concentrate chamber under the action of a selective cation exchange membrane, and calcium ions are trapped in the fresh water chamber. Sodium ions in the concentrated water chamber are continuously increased, and the sodium ions exist in the concentrated water chamber in the forms of sodium chloride and sodium sulfate and are continuously and circularly accumulated through the concentrated solution circulating pipeline b 8. It should be noted that, various ion exchange membranes required for implementing the present invention are commercially available, and the present invention is not described herein.
An intermediate fresh water chamber 13 is arranged between the first membrane stack region 1 and the second membrane stack region 2, and the fresh water circulation pipeline a5 and the fresh water circulation pipeline b9 are communicated through the intermediate fresh water chamber 13, so that the charges of the liquid in the fresh water circulation pipeline a5 and the fresh water circulation pipeline b9 are balanced. It should be noted that, one side of the middle fresh water chamber 13 may be a cation exchange membrane of the membrane pair a6 located at the most distal end of the first membrane stack region 1, and the other side of the middle fresh water chamber 13 may be an anion exchange membrane of the membrane pair b10 located at the most distal end of the second membrane stack region 2; the chamber may also be formed directly by cation and anion exchange membranes and corresponding separators.
In one specific embodiment of the invention, in the first membrane stack zone 1, the water inlet of the fresh water tank a11 is communicated with the water outlet of the fresh water chamber in the membrane pair a6 through a pipeline, and the water outlet of the fresh water tank a11 is communicated with the water inlet of the fresh water chamber in the membrane pair a6 through a pipeline. The wastewater enters the fresh water circulation pipeline a5 through the fresh water tank a11, is conveyed to the fresh water chamber of the membrane pair a6 through a water pump, and returns to the fresh water tank a11, so that a circulation process in the fresh water circulation pipeline a5 is completed.
As an alternative implementation manner of the embodiment of the present invention, the fresh water circulation pipeline a5 is provided with a fresh water outlet a14, and a pipeline with a water outlet of the intermediate fresh water chamber 13 communicated with a water inlet of the fresh water tank a11 is used as a part of the fresh water circulation pipeline a5, and in practical application, the fresh water outlet a14 may be provided on the pipeline. The fresh water circulated in the fresh water circulation pipeline a5 of the first membrane stack zone 1 can flow out through the fresh water outlet a14, the salt content is reduced to 5000-10000 mg/L, and the deep desalination can be further carried out through a reverse osmosis process.
In a specific embodiment of the invention, in the second membrane stack zone 2, the water inlet of the fresh water tank b12 is communicated with the water outlet of the fresh water chamber in the membrane pair b10 through a pipeline, and the water outlet of the fresh water tank b12 is communicated with the water inlet of the fresh water chamber in the membrane pair b10 through a pipeline. The wastewater enters the fresh water circulation pipeline b9 through the fresh water tank b12, is conveyed to the fresh water chamber of the membrane pair b10 through a water pump, and returns to the fresh water tank b12, so that a circulation process in the fresh water circulation pipeline b9 is completed.
As an alternative implementation manner of the embodiment of the present invention, the fresh water circulation pipeline b9 may also be provided with a fresh water outlet b15, and a pipeline in which the water outlet of the intermediate fresh water chamber 13 communicates with the water inlet of the fresh water tank b12 is used as a part of the fresh water circulation pipeline b9, where the fresh water outlet b15 may be provided in practical application. The fresh water circulated in the fresh water circulation pipeline b9 of the second membrane stack zone 2 can flow out through the fresh water outlet b15, the salt content is reduced to 5000-10000 mg/L, and the deep desalination can be further carried out through a reverse osmosis process. Compared with the existing electrodialysis device, the embodiment of the invention can be provided with the fresh water outlets on the fresh water circulation pipelines positioned in the first membrane pile area and the second membrane pile area respectively, so that the fresh water output of the whole membrane pile system is improved.
In a specific embodiment of the present invention, the water inlet of the middle fresh water chamber 13 is respectively communicated with the water outlets of the fresh water tank a11 and the fresh water tank b12 through pipelines, and fresh water in the fresh water circulation pipeline a5 and the fresh water circulation pipeline b9 can be converged in the middle fresh water chamber 13; the water outlets of the middle fresh water chamber 13 are respectively communicated with the water inlets of the fresh water tank a11 and the fresh water tank b12 through pipelines, and fresh water converged in the middle fresh water chamber 13 flows back to the fresh water circulation pipeline a5 and the fresh water circulation pipeline b9 respectively, so that the charges of the liquid in the fresh water circulation pipeline a5 and the fresh water circulation pipeline b9 are balanced.
In a specific embodiment of the invention, in the first membrane stack zone 1, a concentrated solution tank a16 is arranged in a concentrated solution circulating pipeline a4, a water inlet of the concentrated solution tank a16 is communicated with a water outlet of a concentrated water chamber in the membrane pair a6 through a pipeline, and a water outlet of the concentrated solution tank a16 is communicated with a water inlet of the concentrated water chamber in the membrane pair a6 through a pipeline. The concentrated solution is conveyed to the concentrated water chamber of the membrane pair a6 from the water outlet of the concentrated solution tank a16 through a water pump, and the concentrated solution generated in the concentrated water chamber flows to the concentrated solution tank a16 from the water outlet of the concentrated water chamber through a pipeline, so that one cycle in the concentrated solution circulating pipeline a4 is completed. The concentrate in the concentrate circulation line a4 contains a large amount of calcium ions, sodium ions and chloride ions, and may specifically exist in the form of calcium chloride and sodium chloride.
As an alternative implementation manner of the embodiment of the present invention, the concentrate circulation pipeline a4 may be provided with a concentrate outlet a18, and a pipe in which the water inlet of the concentrate tank a16 is communicated with the water outlet of the concentrate chamber in the membrane pair a6 is used as a part of the concentrate circulation pipeline a4, and in practical application, the concentrate outlet a18 may be provided on the pipe. The concentrated solution circulated in the concentrated solution circulation pipeline a4 of the first membrane stack zone 1 can flow out through the concentrated solution outlet a18, and the salt content of the concentrated solution is increased to more than 20000 mg/L.
In a specific embodiment of the invention, in the second membrane stack region 2, a concentrated solution tank b17 is arranged in a concentrated solution circulation pipeline b8, a water inlet of the concentrated solution tank b17 is communicated with a water outlet of a concentrated water chamber in the membrane pair b10 through a pipeline, and a water outlet of the concentrated solution tank b17 is communicated with a water inlet of the concentrated water chamber in the membrane pair b10 through a pipeline. The concentrated solution is conveyed to the concentrated water chamber of the membrane pair b10 from the water outlet of the concentrated solution tank b17 through a water pump, and the concentrated solution generated in the concentrated water chamber flows to the concentrated solution tank b17 from the water outlet of the concentrated water chamber through a pipeline, so that one-time circulation in the concentrated solution circulation pipeline b8 is completed. The concentrate in the concentrate circulation line b8 contains a large amount of sulfate, sodium ions and chloride ions, and may specifically exist in the form of sodium sulfate and sodium chloride.
As an alternative implementation manner of the embodiment of the present invention, the concentrate circulation pipeline b8 may be provided with a concentrate water outlet b19, and a pipeline in which the water inlet of the concentrate tank b17 is communicated with the water outlet of the concentrate chamber in the membrane pair b10 is used as a part of the concentrate circulation pipeline b8, and in practical application, the concentrate water outlet b19 may be provided on the pipeline. The concentrated solution circulated in the concentrated solution circulation pipeline b8 of the second membrane stack region 2 can flow out through the concentrated solution outlet b19, and the salt content of the concentrated solution is increased to more than 20000 mg/L.
As an optional implementation manner of the embodiment of the invention, the device can further comprise a polar water tank a20 and a polar water tank b21, wherein the water inlet of the polar water tank a20 is communicated with the water outlet of the cathode polar chamber 3 through a pipeline, and the water outlet of the polar water tank a20 is communicated with the water inlet of the cathode polar chamber 3 through a pipeline to form a cathode polar water circulation pipeline. In the cathode chamber, the cathode electrode plate continuously discharges hydrogen, and the generated cathode water contains hydroxyl and is usually alkaline. The water inlet of the polar water tank b21 is communicated with the water outlet of the anode chamber 7 through a pipeline, and the water outlet of the polar water tank b21 is communicated with the water inlet of the anode chamber 7 through a pipeline to form an anode water circulation pipeline. In the anode chamber, the anode plate continuously discharges chlorine, and the generated anode water contains hydrogen ions and is usually acidic.
As an alternative implementation of the embodiment of the present invention, the water in the cathode chamber 3 and the water in the anode chamber 7 may be communicated, so as to neutralize the acid and alkali of the water and reduce the corrosion to the cathode chamber 3 and the anode chamber 7.
The high-efficiency wastewater salt separation, concentration and desalination integrated device provided by the invention can treat high-hardness wastewater into a calcium chloride concentrated solution and a sodium sulfate concentrated solution without scaling, and sodium carbonate is not required to be added as a softening agent, so that wastewater treatment cost is reduced; the raw water is desalted after salt separation and migration, and the produced water can be further desalted deeply through reverse osmosis. The calcium chloride and the sodium sulfate obtained by separating the salt are continuously concentrated in a circulating way, the concentration of the concentrated solution can reach over 200000mg/L, the concentrated solution can be directly recycled, the crystallized salt can be prepared by further evaporating and crystallizing, and gypsum can be formed by mixing and reacting the two concentrates, so that the resource utilization rate is improved; on this basis, because with membrane heap subregion setting, every membrane heap subregion all is provided with a fresh water circulation pipeline and a fresh water tank, not only can add waste water to the membrane heap simultaneously, can also reduce the circulation path length in original fresh water circulation pipeline by a wide margin, makes waste water pass through the membrane pair more times in the unit time, when reducing this device running cost, can also improve this desalination efficiency greatly.
In the high-efficiency wastewater salt separation, concentration and desalination integrated device, fluid, such as liquid, such as wastewater, fresh water, various concentrated solutions and the like, or solid, such as sediment, various medicaments and the like, is conveyed among the parts of the device, and unless otherwise stated, the fluid, such as the liquid, the fresh water, various concentrated solutions and the like, can be generally conveyed through pipelines; in addition, when additional power transmission is needed in the conveying process, power equipment such as a proper pump, a proper fan and the like can be additionally arranged on a needed pipeline. Further, suitable valves may be added to the piping to control the flow direction of the fluid, etc. as needed.
It should be noted that in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a high-efficient waste water salt separation concentration desalination integrated device which characterized in that includes: a first membrane stack region (1) and a second membrane stack region (2), wherein the first membrane stack region (1) is provided with a cathode electrode chamber (3), a concentrated solution circulating pipeline a (4), a fresh water circulating pipeline a (5) and a plurality of membrane pairs a (6) which are arranged side by side; the second membrane stack region (2) is provided with an anode chamber (7), a concentrated solution circulating pipeline b (8), a fresh water circulating pipeline b (9) and a plurality of membrane pairs b (10) which are arranged side by side; the fresh water circulation pipeline a (5) is used for fresh water circulation of the first membrane stack region (1), and the fresh water circulation pipeline b (9) is used for fresh water circulation of the second membrane stack region (2); a fresh water tank a (11) is arranged on the fresh water circulation pipeline a (5), a fresh water tank b (12) is arranged on the fresh water circulation pipeline b (9), and the fresh water tank a (11) and the fresh water tank b (12) are symmetrically arranged on the left and right by taking the central line between the first membrane stack area (1) and the second membrane stack area (2) as an axis; an intermediate fresh water chamber (13) is arranged between the first membrane stack region (1) and the second membrane stack region (2), and the fresh water circulation pipeline a (5) and the fresh water circulation pipeline b (9) are communicated through the intermediate fresh water chamber (13); the membrane pair a (6) comprises a cation exchange membrane and a selective anion exchange membrane; the membrane pair b (10) comprises an anion exchange membrane and a selective cation exchange membrane;
the concentrated solution circulating pipeline a (4) is internally provided with a concentrated solution tank a (16), a water inlet of the concentrated solution tank a (16) is communicated with a water outlet of a concentrated water chamber in the membrane pair a (6) through a pipeline, and a water outlet of the concentrated solution tank a (16) is communicated with a water inlet of the concentrated water chamber in the membrane pair a (6) through a pipeline.
2. The high-efficiency wastewater salt separation, concentration and desalination integrated device according to claim 1, wherein a water inlet of the fresh water tank a (11) is communicated with a water outlet of a fresh water chamber in the membrane pair a (6) through a pipeline; the water outlet of the fresh water tank a (11) is communicated with the water inlet of the fresh water chamber in the membrane pair a (6) through a pipeline; the water inlet of the fresh water tank b (12) is communicated with the water outlet of the fresh water chamber in the membrane pair b (10) through a pipeline; the water outlet of the fresh water tank b (12) is communicated with the water inlet of the fresh water chamber in the membrane pair b (10) through a pipeline.
3. The high-efficiency wastewater salt separation, concentration and desalination integrated device according to claim 2, wherein water inlets of the middle fresh water chamber (13) are respectively communicated with water outlets of the fresh water tank a (11) and the fresh water tank b (12) through pipelines; the water outlet of the middle fresh water chamber (13) is respectively communicated with the water inlets of the fresh water tank a (11) and the fresh water tank b (12) through pipelines.
4. The integrated device for separating, concentrating and desalting high-efficiency wastewater salt according to claim 3, wherein a fresh water chamber outlet a (14) is arranged on the fresh water circulation pipeline a (5); the fresh water circulation pipeline b (9) is provided with a fresh water chamber outlet b (15).
5. The high-efficiency wastewater salt separation, concentration and desalination integrated device according to claim 1, wherein a concentrated solution outlet a (18) is arranged on a pipeline which is communicated with a concentrated solution chamber outlet in the membrane pair a (6) through a water inlet of the concentrated solution tank a (16).
6. The efficient wastewater salt separation, concentration and desalination integrated device according to claim 1, wherein a concentrated solution tank b (17) is arranged in the concentrated solution circulation pipeline b (8), a water inlet of the concentrated solution tank b (17) is communicated with a water outlet of a concentrated water chamber in the membrane pair b (10) through a pipeline, and a water outlet of the concentrated solution tank b (17) is communicated with a water inlet of the concentrated water chamber in the membrane pair b (10) through a pipeline.
7. The integrated device for separating, concentrating and desalting high-efficiency wastewater salt according to claim 6, wherein a concentrated solution outlet b (19) is arranged on a pipeline, wherein the water inlet of the concentrated solution tank b (17) is communicated with the concentrated solution chamber outlet in the membrane pair b (10).
8. The efficient wastewater salt separation, concentration and desalination integrated device according to claim 1, further comprising a polar water tank a (20) and a polar water tank b (21), wherein a water inlet of the polar water tank a (20) is communicated with a water outlet of the cathode polar chamber (3) through a pipeline, and a water outlet of the polar water tank a (20) is communicated with a water inlet of the cathode polar chamber (3) through a pipeline; the water inlet of the polar water tank b (21) is communicated with the water outlet of the anode polar chamber (7) through a pipeline, and the water outlet of the polar water tank b (21) is communicated with the water inlet of the anode polar chamber (7) through a pipeline.
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| CN111470674A (en) * | 2020-04-23 | 2020-07-31 | 国电蚌埠发电有限公司 | High-rate concentration decrement treatment process for desulfurization wastewater of thermal power plant |
| CN111439883A (en) * | 2020-05-08 | 2020-07-24 | 浙江浙能技术研究院有限公司 | Coal-fired power plant wet desulphurization wastewater decrement zero-discharge treatment system and method |
| CN111439814A (en) * | 2020-05-08 | 2020-07-24 | 浙江浙能技术研究院有限公司 | Desulfurization wastewater concentration and reduction treatment system and method based on non-softening and directional driving electrodialysis technology |
| CN111960583A (en) * | 2020-08-28 | 2020-11-20 | 浙江浙能技术研究院有限公司 | Electrodialysis device and method for preventing polar water system from scaling by adopting directional driving technology |
| CN112479421A (en) * | 2020-11-10 | 2021-03-12 | 西安西热水务环保有限公司 | High-hardness wastewater softening and resource recycling system and method |
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