CN212151922U - System for utilize electrodialysis utilization strong brine - Google Patents
System for utilize electrodialysis utilization strong brine Download PDFInfo
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- CN212151922U CN212151922U CN201921820206.3U CN201921820206U CN212151922U CN 212151922 U CN212151922 U CN 212151922U CN 201921820206 U CN201921820206 U CN 201921820206U CN 212151922 U CN212151922 U CN 212151922U
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Abstract
The invention discloses a system for utilizing electrodialysis resource to utilize strong brine, which comprises a reverse osmosis strong brine collecting pool, a filter, a pre-desalting tank, an electrodialysis tank, a rectifier, a concentrated liquid tank, an anode liquid tank, a cathode liquid tank, a fan and a hydrochloric acid tank. Also discloses a method for recycling the strong brine by electrodialysis, which is realized by adopting the system. The invention can promote the water resource utilization of the strong brine, save water resources, relieve the shortage of fresh water supply of the coastal power plant, improve the surrounding ecological environment of the coastal power plant and meet the production and living needs to the maximum extent.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a system for recycling strong brine by electrodialysis.
Background
With the improvement of national environmental protection requirements, the standard discharge of wastewater of a thermal power plant is changed into zero discharge, reverse osmosis is used as the most common water treatment desalination technology, the recycling of strong brine is a problem which must be faced, and the reverse osmosis strong brine is mostly used for supplementing water by indirect open circulating water and wet desulphurization process at present. Seawater direct current cooling is mostly adopted in coastal power plants, and reverse osmosis strong brine is discharged into circulating water, so that the circulating water does not meet the environmental protection requirement; be used for wet flue gas desulfurization will increase desulfurization waste water production, and desulfurization waste water advanced treatment invests in huge, and the running cost is high, has the water yield of reverse osmosis strong brine moreover and the not matched scheduling problem of desulfurization water consumption.
The water treatment desalination technology of the thermal power plant is an important link for providing high-purity desalted water for a unit, reverse osmosis is taken as the water treatment desalination technology, and the requirement on the quality of inlet water is high, so that the salt content of strong brine is high, but the contents of other harmful ions such as heavy metal, ammonia nitrogen and nitrite are not high, and the chroma and turbidity are low; meanwhile, due to the high removal rate of the reverse osmosis membrane element on the silicon dioxide, the silicon dioxide and most of organic matters in the raw water are completely transferred into the strong brine and concentrated by four times; according to the water quality characteristics of the reverse osmosis strong brine, the possibility is provided for resource utilization of the reverse osmosis strong brine.
Disclosure of Invention
In order to solve the problems, the invention discloses a system for utilizing electrodialysis resource to utilize strong brine, which can promote the water resource utilization of the strong brine, save water resources, relieve the shortage of fresh water supply of coastal power plants, improve the ecological environment around the coastal power plants and meet the production and living needs to the maximum extent.
In order to achieve the above purpose, the invention provides the following technical scheme:
a system for utilizing strong brine by electrodialysis resource utilization comprises a reverse osmosis strong brine collecting pool, a filter, a pre-desalting tank, an electrodialysis tank, a rectifier, a concentrated liquid tank, an anode liquid tank, a cathode liquid tank, a fan and a hydrochloric acid tank; the reverse osmosis strong brine collecting tank is connected with the filter through a strong brine lifting pump; the filter is connected with the pre-desalting tank and the concentrated liquid tank; the pre-desalting tank comprises a fresh water outlet and a concentrated water outlet, and the concentrated water outlet is connected with the electrodialysis tank through a pre-desalting circulating pump; the electrodialysis tank is circularly connected with the pre-desalting tank; the fresh water outlet is a desalted liquid outlet; the electrodialysis tank is connected with a concentrated liquid tank, and the concentrated liquid tank is circularly connected with the electrodialysis tank through a concentrated liquid circulating pump; both ends of the electrodialysis cell are connected with a rectifier; the electrodialysis cell is respectively connected with an anode liquid tank and a cathode liquid tank; the anolyte tank is circularly connected with the electrodialysis tank through an anolyte circulating pump; the cathode liquid tank is circularly connected with the electrodialysis tank through a cathode liquid circulating pump; the anode liquid tank and the cathode liquid tank are both connected with a fan; the hydrochloric acid tank is respectively connected with a cathode liquid tank and a concentrated liquid tank through a hydrochloric acid dosing pump; the concentrated solution tank is provided with a concentrated solution outlet.
Further, the electrodialysis tank comprises a tank body, ion exchange membranes are alternately arranged in the tank body, each ion exchange membrane comprises a positive membrane and a negative membrane, and a partition plate is arranged between the positive membrane and the negative membrane; the tank body is divided into small water chambers by the positive film and the negative film; two ends of the tank body are respectively provided with a pair of electrodes; the electrode comprises an anode and a cathode, and the space separated by an anion exchange membrane on the anode side and a cation exchange membrane on the cathode side is a desalting chamber (D chamber); on the contrary, the space partitioned by the cation exchange membrane on the anode side and the anion exchange membrane on the cathode side is a concentrating chamber (C chamber); the polar water chamber on the anode side is connected with an anode liquid tank, and the polar water chamber on the cathode side is connected with a cathode liquid tank; the concentration chamber is connected with a concentrated liquid tank.
Further, 100 pairs of ion exchange membranes are arranged in the electrodialysis tank; film size 1120 x 550 mm.
Further, solid Na2SO4 was added to the anolyte tank.
Furthermore, the reverse osmosis strong brine collecting tank, the pre-desalting tank, the concentrated liquid tank, the anode liquid tank and the cathode liquid tank are all connected with a drainage ditch.
Further, the hydrochloric acid tank is connected with a concentrated solution tank through a hydrochloric acid dosing pump I; the hydrochloric acid tank is connected with the cathode liquid tank through a hydrochloric acid dosing pump II.
Furthermore, the whole system is also provided with meters such as a flowmeter, a pressure gauge, a conductivity meter and a liquid level meter, so that the strong brine is detected.
The reverse osmosis strong brine enters a filter through a strong brine lifting pump and then enters a desalination liquid tank; the desalted liquid in the desalted liquid tank enters an electrodialysis tank through a circulating pump at a concentrated water outlet, and the electrodialysis tank is circularly connected with a rectifier; the electrodialysis cell is connected with a cathode liquid tank, the cathode liquid tank is connected with the electrodialysis cell through a cathode liquid circulating pump, the electrodialysis cell is connected with an anode liquid tank, the anode liquid tank is connected with the electrodialysis cell through an anode liquid circulating pump, and the electrodialysis cell is connected with a concentrated liquid tank; the concentrated solution tank is circularly connected with the electrodialysis tank through a concentrated solution circulating pump; the electrodialysis groove is circularly connected with a desalting solution circulating pump; the desalted liquid in the desalted liquid tank is reused to the existing water treatment desalting system at a fresh water outlet; and (4) recycling the concentrated solution discharged from the concentrated solution tank to the existing electrolytic sodium hypochlorite system.
A method for recycling strong brine by electrodialysis by adopting the system comprises the following steps:
firstly, strong brine enters a reverse osmosis strong brine collecting tank;
secondly, the strong brine in the reverse osmosis strong brine collecting tank enters a filter and is filtered;
thirdly, the filtered strong brine enters a pre-desalting tank, is lifted by a pre-desalting water pump and then enters an electrodialysis tank for circular desalting treatment, and desalting solution is recycled to the existing water treatment desalting system;
fourthly, carrying out electrodialysis treatment on the strong brine in the electrodialysis tank, and simultaneously connecting an anode water chamber of the electrodialysis tank with an anode liquid tank; the anode liquid tank receives the anode liquid and circulates to the electrodialysis tank; the cathode water chamber of the electrodialysis cell is connected with a cathode liquid tank; the cathode liquid tank receives the cathode liquid and circulates to the electrodialysis tank; the concentrated solution of the electrodialysis cell enters a concentrated solution tank; after the concentrated solution is further concentrated, the concentrated solution is recycled to the existing electrolytic sodium hypochlorite system; the concentrated liquid tank is circularly connected with the electrodialysis tank.
The electrodialysis cell treatment liquid is not passed once, but is desalted and concentrated by being continuously circulated. In the continuous treatment, the strong brine is continuously supplied, and the pre-desalted water and the concentrated solution are gradually overflowed from the pre-desalting tank and the concentrated solution tank, respectively. And the filtered strong brine enters a pre-desalting tank and a concentrated solution tank respectively, and is conveyed into an electrodialysis tank for desalting and concentrating treatment through a pre-desalting circulating pump and a concentrated solution circulating pump respectively. After the treatment of the electrodialysis tank, desalted water enters a pre-desalting tank, and concentrated solution enters a concentrated solution tank. The desalted liquid (fresh water) is recycled to the existing water treatment desalting system.
Furthermore, the cathode liquid tank and the concentrated liquid tank are connected with a hydrochloric acid tank, and the hydrochloric acid tank provides hydrochloric acid for the cathode liquid tank and the concentrated liquid tank.
Furthermore, the anode liquid tank and the cathode liquid tank are both connected with a fan.
And further, in the third step, the filtered strong brine also enters a concentrated solution tank. The filtered strong brine enters a pre-desalting tank and a concentrated solution tank simultaneously, and the treatment liquid of the electrodialysis tank is not passed at one time but desalted and concentrated by continuous circulation. The longer the cycle time, the higher the concentration and the higher the salt rejection to reach the economic balance point.
The working principle of the invention is as follows:
1. introduction to electrodialysis method
Electrodialysis is widely used in various fields as a water treatment desalination process of an ion exchange membrane. The electrodialysis method is a method for desalting and desalting strong brine by using an ion exchange membrane. The ion exchange membrane is a functional membrane, and is divided into an anion exchange membrane and a cation exchange membrane (called as a negative membrane and a positive membrane for short). The positive membrane allows only cations to pass through and the negative membrane allows only anions to pass through, which is the permselectivity of the ion exchange membrane. Under the action of an external electric field, anions and cations in the aqueous solution can respectively move to the anode and the cathode, and if an exchange membrane is added between the anions and the cathode, the separation and concentration can be achieved. Electrodialysis utilizes this principle.
The ion exchange membrane contains enough fixed groups and dissociable ions, has certain selectivity and conductivity to various ions, is widely applied to various water treatment desalination fields, and separates out different types of ions.
2. Basic principle of electrodialysis method
In the electrodialyzer, a plurality of positive membranes and negative membranes are alternately arranged and divided into small water chambers. When raw water enters the small chambers, ions in the solution are directionally migrated under the action of the direct current electric field. The cation membrane only allows cations to pass through and retains anions; the negative membrane allows only anions to pass through while retaining cations. As a result, a portion of these chambers become dilute chambers with very little ion content, and the effluent is called fresh water. And the small chamber adjacent to the fresh water chamber becomes a concentrated water chamber for gathering a large amount of ions, and the outlet water is called concentrated water. So that the ions are separated and concentrated and the water is purified.
Compared with electrodialysis and ion exchange, the following similarities and differences exist:
(1) although the working medium for separating ions is ion exchange resin, the working medium is a flaky film, and the working medium is spherical particles;
(2) in terms of action mechanism, electrodialysis belongs to ion interception and replacement, and an ion exchange membrane plays roles in ion selective permeation and interception in the process. Ion exchange belongs to ion transfer replacement, and ion exchange resin generates ion exchange reaction in the process. More precisely, therefore, the ion-exchange membrane should be made into an ion-selective permeable membrane;
(3) the electrodialytic working medium does not need to be regenerated, but consumes electric energy; the ion-exchanged working medium must be regenerated, but without consuming electrical energy.
The invention has the following beneficial effects:
compared with the traditional ion exchange resin process, the novel method for electrodialytic resource utilization of the strong brine has the advantages that:
1. the electrodialysis system does not need regeneration operation like ion exchange resin, so that the using amount of the medicament can be greatly reduced, the operating cost of the system increased by adding the medicament is reduced, the discharge amount of acid-base wastewater can be reduced, and the ecological environment is protected.
2. The electrodialysis system has simple equipment and simple and convenient operation, basically realizes full-automatic operation, lightens the labor intensity of operators, has less maintenance workload and has stable effluent quality.
3. The invention can promote the water resource utilization of the strong brine, save water resources, relieve the shortage of fresh water supply of the coastal power plant, improve the surrounding ecological environment of the coastal power plant and meet the production and living needs to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of electrodialysis;
FIG. 2 is a process flow diagram of electrodialysis resource utilization of concentrated brine;
FIG. 3 is a flow chart of a system for electrodialytic resource utilization of concentrated brine.
Wherein:
1. a reverse osmosis strong brine collecting tank; 2. a strong brine lift pump; 3. a filter; 4. a pre-desalting tank; 5. a pre-desalination circulation pump; 6. an electrodialysis cell; 7. a rectifier; 8. a concentrated liquid tank; 9. a concentrated solution circulating pump; 10. an anode liquid tank; 11. an anolyte circulating pump; 12. a cathode liquid tank; 13. a catholyte circulating pump; 14. a fan; 15. A hydrochloric acid tank; 16. a hydrochloric acid dosing pump I; 17. and a second hydrochloric acid dosing pump.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.
Example 1
A system for utilizing strong brine by electrodialysis resource utilization comprises a reverse osmosis strong brine collecting pool 1, a filter 3, a pre-desalting tank 4, an electrodialysis tank 6, a rectifier 7, a concentrated liquid tank 8, an anode liquid tank 10, a cathode liquid tank 12, a fan 14 and a hydrochloric acid tank 15; the reverse osmosis strong brine collecting tank 1 is connected with a filter 3 through a strong brine lifting pump 2; the filter 3 is connected with the pre-desalting tank 4 and the concentrated liquid tank 8; the pre-desalting tank 4 comprises a fresh water outlet and a concentrated water outlet, and the concentrated water outlet is connected with the electrodialysis tank 6 through a pre-desalting circulating pump 5; the electrodialysis groove 6 is circularly connected with the pre-desalting tank 4; the fresh water outlet is a desalting liquid outlet; the electrodialysis groove 6 is connected with a concentrated solution tank 8, and the concentrated solution tank 8 is circularly connected with the electrodialysis groove 6 through a concentrated solution circulating pump 9; two ends of the electrodialysis groove 6 are connected with a rectifier 7; the electrodialysis cell 6 is respectively connected with an anode liquid tank 10 and a cathode liquid tank 12; the anolyte tank 10 is circularly connected with the electrodialysis tank 6 through an anolyte circulating pump 11; the cathode liquid tank 12 is circularly connected with the electrodialysis tank 6 through a cathode liquid circulating pump 13; the anode liquid tank 10 and the cathode liquid tank 12 are both connected with a fan 14; the hydrochloric acid tank 15 is respectively connected with the cathode liquid tank 12 and the concentrated liquid tank 8 through a hydrochloric acid dosing pump; the concentrated solution tank 8 is provided with a concentrated solution outlet.
The electrodialysis tank 6 comprises a tank body, ion exchange membranes are alternately arranged in the tank body, each ion exchange membrane comprises an anode membrane and a cathode membrane, and a partition plate is arranged between the anode membrane and the cathode membrane; the tank body is divided into small water chambers by the positive film and the negative film; two ends of the tank body are respectively provided with a pair of electrodes; the electrode comprises an anode and a cathode, and the space separated by an anion exchange membrane on the anode side and a cation exchange membrane on the cathode side is a desalting chamber (D chamber); on the contrary, the space partitioned by the cation exchange membrane on the anode side and the anion exchange membrane on the cathode side is a concentrating chamber (C chamber); the polar water chamber on the anode side is connected with an anode liquid tank 10, and the polar water chamber on the cathode side is connected with a cathode liquid tank 12; the concentration chamber is connected with a concentrated solution tank 8. 100 pairs of ion exchange membranes are arranged in the electrodialysis tank 6; film size 1120 x 550 mm.
Solid Na2SO4 was added to the anolyte tank 10.
The reverse osmosis strong brine collecting tank 1, the pre-desalting tank 4, the concentrated liquid tank 8, the anode liquid tank 10 and the cathode liquid tank 12 are all connected with a drainage ditch.
The hydrochloric acid tank 15 is connected with the concentrated solution tank 8 through a hydrochloric acid dosing pump I16; the hydrochloric acid tank 15 is connected with the cathode liquid tank 12 through a second hydrochloric acid dosing pump 17.
The whole system is also provided with meters such as a flowmeter, a pressure gauge, a conductivity meter, a liquid level meter and the like, so that the strong brine is detected.
Example 2
A method for utilizing electrodialysis as a resource for utilizing concentrated brine by using the system of example 1, the method comprising the steps of:
firstly, strong brine enters a reverse osmosis strong brine collecting tank;
secondly, the strong brine in the reverse osmosis strong brine collecting tank enters a filter and is filtered;
thirdly, the filtered strong brine enters a pre-desalting tank, is lifted by a pre-desalting water pump and then enters an electrodialysis tank for circular desalting treatment, and desalting solution is recycled to the existing water treatment desalting system; and the filtered strong brine also enters a concentrated solution tank.
Fourthly, carrying out electrodialysis treatment on the strong brine in the electrodialysis tank, and simultaneously connecting an anode water chamber of the electrodialysis tank with an anode liquid tank; the anode liquid tank receives the anode liquid and circulates to the electrodialysis tank; the cathode water chamber of the electrodialysis cell is connected with a cathode liquid tank; the cathode liquid tank receives the cathode liquid and circulates to the electrodialysis tank; the concentrated solution of the electrodialysis cell enters a concentrated solution tank; after the concentrated solution is further concentrated, the concentrated solution is recycled to the existing electrolytic sodium hypochlorite system; the concentrated liquid tank is circularly connected with the electrodialysis tank. The cathode liquid tank and the concentrated liquid tank are connected with a hydrochloric acid tank, and the hydrochloric acid tank provides hydrochloric acid for the cathode liquid tank and the concentrated liquid tank. The anode liquid tank and the cathode liquid tank are both connected with a fan.
The electrodialysis cell treatment liquid is not passed once, but is desalted and concentrated by being continuously circulated. In the continuous treatment, the strong brine is continuously supplied, and the pre-desalted water and the concentrated solution are gradually overflowed from the pre-desalting tank and the concentrated solution tank, respectively. And the filtered strong brine enters a pre-desalting tank and a concentrated solution tank respectively, and is conveyed into an electrodialysis tank for desalting and concentrating treatment through a pre-desalting circulating pump and a concentrated solution circulating pump respectively. After the treatment of the electrodialysis tank, desalted water enters a pre-desalting tank, and concentrated solution enters a concentrated solution tank. The desalted liquid (fresh water) is recycled to the existing water treatment desalting system.
In order to solve the problem of resource utilization of reverse osmosis concentrated brine, the specific embodiment adopts the following technologies:
1. introduction to electrodialysis method
Electrodialysis is widely used in various fields as a water treatment desalination process of an ion exchange membrane. The electrodialysis method is a method for desalting and desalting strong brine by using an ion exchange membrane. The ion exchange membrane is a functional membrane, and is divided into an anion exchange membrane and a cation exchange membrane (called as a negative membrane and a positive membrane for short). The positive membrane allows only cations to pass through and the negative membrane allows only anions to pass through, which is the permselectivity of the ion exchange membrane. Under the action of an external electric field, anions and cations in the aqueous solution can respectively move to the anode and the cathode, and if an exchange membrane is added between the anions and the cathode, the separation and concentration can be achieved. Electrodialysis utilizes this principle.
The ion exchange membrane contains enough fixed groups and dissociable ions, has certain selectivity and conductivity to various ions, is widely applied to various water treatment desalination fields, and separates out different types of ions.
2. Basic principle of electrodialysis method
In the electrodialyzer, a plurality of positive membranes and negative membranes are alternately arranged and divided into small water chambers. When raw water enters the small chambers, ions in the solution are directionally migrated under the action of the direct current electric field. The cation membrane only allows cations to pass through and retains anions; the negative membrane allows only anions to pass through while retaining cations. As a result, a portion of these chambers become dilute chambers with very little ion content, and the effluent is called fresh water. And the small chamber adjacent to the fresh water chamber becomes a concentrated water chamber for gathering a large amount of ions, and the outlet water is called concentrated water. So that the ions are separated and concentrated and the water is purified.
Compared with electrodialysis and ion exchange, the following similarities and differences exist:
(1) although the working medium for separating ions is ion exchange resin, the working medium is a flaky film, and the working medium is spherical particles;
(2) in terms of action mechanism, electrodialysis belongs to ion interception and replacement, and an ion exchange membrane plays roles in ion selective permeation and interception in the process. Ion exchange belongs to ion transfer replacement, and ion exchange resin generates ion exchange reaction in the process. More precisely, therefore, the ion-exchange membrane should be made into an ion-selective permeable membrane;
(3) the electrodialytic working medium does not need to be regenerated, but consumes electric energy; the ion-exchanged working medium must be regenerated, but without consuming electrical energy.
3. Main body equipment for electrodialysis resource utilization of reverse osmosis strong brine
Table one: electrodialysis resource utilization strong brine system's equipment list
4. Process flow
The overall flow is shown in fig. 2 and 3: the reverse osmosis strong brine enters a filter through a strong brine lifting pump and then enters a desalination liquid tank; the desalted liquid in the desalted liquid tank enters an electrodialysis tank through a circulating pump at a concentrated water outlet, and the electrodialysis tank is circularly connected with a rectifier; the electrodialysis cell is connected with a cathode liquid tank, the cathode liquid tank is connected with the electrodialysis cell through a cathode liquid circulating pump, the electrodialysis cell is connected with an anode liquid tank, the anode liquid tank is connected with the electrodialysis cell through an anode liquid circulating pump, and the electrodialysis cell is connected with a concentrated liquid tank; the concentrated solution tank is circularly connected with the electrodialysis tank through a concentrated solution circulating pump; the electrodialysis groove is circularly connected with a desalting solution circulating pump; and the desalted liquid in the desalted liquid tank is recycled to the existing water treatment desalting system at a fresh water outlet.
The electrodialysis tank comprises a tank body, a plurality of positive membranes and negative membranes are alternately arranged in the tank body, and a partition plate is arranged between the positive membranes and the negative membranes; the tank body is divided into small water chambers by the positive film and the negative film; two ends of the tank body are respectively provided with a pair of electrodes; the electrode comprises an anode and a cathode, and the space separated by an anion exchange membrane on the anode side and a cation exchange membrane on the cathode side is a desalting chamber (D chamber); on the contrary, the space partitioned by the cation exchange membrane on the anode side and the anion exchange membrane on the cathode side is a concentrating chamber (C chamber); the polar water chamber of the anode side is connected with an anode liquid tank, and the polar water chamber of the cathode liquid is connected with a cathode liquid tank.
When raw water enters the small chambers, ions in the solution are directionally migrated under the action of the direct current electric field. The cation membrane only allows cations to pass through and retains anions; the negative membrane allows only anions to pass through while retaining cations. As a result, a portion of these chambers become dilute chambers with very little ion content, and the effluent is called fresh water. And the small chamber adjacent to the fresh water chamber becomes a concentrated water chamber for gathering a large amount of ions, and the outlet water is called concentrated water. So that the ions are separated and concentrated and the water is purified.
(1) Electrodialysis (ED) is a technique for desalination and concentration using direct current as a driving force. The principle is as follows: the cation membrane and the anion membrane are alternately arranged, and are laminated via a plurality of separators, and a pair of electrodes are disposed at both ends of the membrane. The space separated by the anion exchange membrane on the anode side and the cation exchange membrane on the cathode side is called a desalting chamber (D chamber); in contrast, the space defined by the cation exchange membrane on the anode side and the anion exchange membrane on the cathode side is called a concentrating compartment (C compartment). In the electrodialysis cell, the cells D and C are arranged alternately, and when the stock solution is supplied to the desalting cells, cations move to the cathode and move to the adjacent cell C on the right side through the cation exchange membrane. Since the cathode side of the C cell is separated by the anion exchange membrane, it is possible to organize the cations to continue moving to the right D cell. The anions move in the same manner from the D cell to the adjacent C cell to the left. This provides an electrodialysis effect of desalting in compartment D and concentrating in compartment C.
(2) Since the nonionic compound does not permeate the ion exchange membrane, the organic substance and the salt can be effectively separated. Due to the high removal rate of silica by the reverse osmosis membrane elements, the silica and most of the organic matter of the raw water are all transferred to the reverse osmosis concentrated brine and concentrated four times. The electrodialysis has high salt separation efficiency, and the fresh water produced by electrodialysis has low salt content and can be reused in the existing water treatment desalination system. The concentrated water at the concentrated water side of electrodialysis is rich in a large amount of salt, and can be used as stock solution of electrolytic sodium hypochlorite for resource utilization.
Therefore, the electrodialysis technology has good ion enrichment performance in the concentration treatment of the reverse osmosis concentrated brine. Compared with the traditional ion exchange resin process, the electrodialysis technology has the greatest advantage that the regeneration operation of the ion exchange resin is not needed, so that the using amount of medicaments can be greatly reduced, the discharge amount of acid-base wastewater is reduced, and the ecological environment is protected. And the electrodialysis system has simple equipment and simple and convenient operation, basically realizes full-automatic operation, has less maintenance workload and stable effluent quality.
Electrodialysis treatment concentrated brine is not passed once, but is desalted and concentrated by continuous circulation. When the system is operated continuously, reverse osmosis strong brine is continuously supplied, and desalted liquid (fresh water) and concentrated liquid (concentrated water) overflow slowly.
The reverse osmosis strong brine passes through the strong brine elevator pump, carries to the filter, after filtering pretreatment, gets into the desalination jar in advance, promotes to the electrodialysis groove through the desalination circulating pump in advance, circulates in the electrodialysis groove, carries out desalination and concentrated processing, and after the salinity of electrodialysis groove is concentrated, the concentrate gets into the concentrate tank, carries out circulation treatment through the concentrate circulating pump to the electrodialysis groove. In addition, solid Na2SO4 is added into the anolyte tank and is conveyed to the electrodialysis tank through an anolyte circulating pump for circulation treatment; hydrochloric acid (HCl) is added into the catholyte tank and is conveyed to the electrodialysis tank through a catholyte circulating pump for circulating treatment.
The desalination liquid (fresh water) in the desalination liquid tank overflows out, and the product water as the electrodialysis can be retrieved to current water treatment desalination system, and concentrate (dense water) in the concentrate tank overflows out, as the strong brine after the higher concentration of salinity content, can carry to current electrolysis sodium hypochlorite system, carries out the utilization as the stoste of electrolysis sodium hypochlorite.
5. Operating procedure
5.1 preparation work before starting up:
firstly, checking whether a pipeline system of the electrodialyzer is connected in a wrong way, whether a joint is fastened and screwed, and whether a circuit system is connected well.
5.2 boot operation
Opening a concentrated water discharge valve of an electrodialyzer, opening a main water inlet valve and concentrated water, fresh water and an electrode water valve, opening a water inlet valve and a water outlet valve of a filter, opening a matched water pump, enabling pressure to rise in a balanced manner until no bubbles exist in water, electrifying after the required flow is reached, slowly adjusting voltage and current upwards when electrifying, operating for 3-5 minutes to measure the qualified water quality, recycling the fresh water to the existing water treatment desalination system, and recycling the concentrated water to the existing sodium hypochlorite system.
5.3 shutdown
When the machine is stopped, firstly, the pipeline water is discharged, the fresh water outlet valve is closed, meanwhile, the voltage is adjusted to zero, the power supply is cut off, and the matched water pump is closed.
5.4 acid washing
When the water inlet pressure of the electrodialyzer is obviously increased and the desalination rate is reduced, the treatment must be carried out by an acid washing method, and 2-3% dilute hydrochloric acid is generally pumped into the electrodialyzer by a hydrochloric acid pump in a circulating manner. When in acid cleaning, the power can not be supplied, firstly, the total water inlet valve and the fresh water outlet valve are closed, simultaneously, the concentrated water discharge valve is closed, the water inlet valve is opened, the acid inlet valve, the acid return valve and the hydrochloric acid pump water inlet and outlet valve are temporarily closed, the hydrochloric acid pump is started for 50 minutes, then the electrode water inlet valve is opened, after the diluted hydrochloric acid solution is pumped, the diluted hydrochloric acid solution is washed by clear water to the pH value of 6-7, and then the diluted hydrochloric acid solution can be put into operation to produce fresh water, and the concentrated brine is recycled.
6. Conclusion
6.1 the electrodialyzer has homogeneous membrane with low resistance and low power consumption.
6.2 the salt content of the concentrated brine of the electrodialyzer can reach about 20 percent, and the requirement of resource utilization of subsequent electrolytic sodium hypochlorite can be met.
6.3 the electrodialysis system has simple equipment, simple and convenient operation, basically realizes full-automatic operation, has less maintenance workload and stable effluent quality.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (6)
1. The utility model provides a system for utilize electrodialysis utilization strong brine as a resource which characterized in that: the system comprises a reverse osmosis strong brine collecting pool (1), a filter (3), a pre-desalting tank (4), an electrodialysis tank (6), a rectifier (7), a concentrated liquid tank (8), an anode liquid tank (10), a cathode liquid tank (12), a fan (14) and a hydrochloric acid tank (15); the reverse osmosis strong brine collecting tank (1) is connected with a filter (3) through a strong brine lifting pump (2); the filter (3) is connected with the pre-desalting tank (4) and the concentrated liquid tank (8); the pre-desalting tank (4) comprises a fresh water outlet and a concentrated water outlet, and the concentrated water outlet is connected with the electrodialysis tank (6) through a pre-desalting circulating pump (5); the electrodialysis tank (6) is circularly connected with the pre-desalting tank (4); the fresh water outlet is a desalted liquid outlet; the electrodialysis tank (6) is connected with a concentrated solution tank (8), and the concentrated solution tank (8) is circularly connected with the electrodialysis tank (6) through a concentrated solution circulating pump (9); two ends of the electrodialysis groove (6) are connected with a rectifier (7); the electrodialysis cell (6) is respectively connected with an anode liquid tank (10) and a cathode liquid tank (12); the anolyte tank (10) is circularly connected with the electrodialysis tank (6) through an anolyte circulating pump (11); the cathode liquid tank (12) is circularly connected with the electrodialysis cell (6) through a cathode liquid circulating pump (13); the anode liquid tank (10) and the cathode liquid tank (12) are both connected with a fan (14); the hydrochloric acid tank (15) is respectively connected with the cathode liquid tank (12) and the concentrated liquid tank (8) through a hydrochloric acid dosing pump; the concentrated solution tank (8) is provided with a concentrated solution outlet.
2. The system for utilizing electrodialysis resource to utilize concentrated brine according to claim 1, wherein: the electrodialysis tank (6) comprises a tank body, ion exchange membranes are alternately arranged in the tank body, each ion exchange membrane comprises an anode membrane and a cathode membrane, and a partition plate is arranged between the anode membrane and the cathode membrane; the tank body is divided into small water chambers by the positive film and the negative film; two ends of the tank body are respectively provided with a pair of electrodes; the electrode comprises an anode and a cathode, and the space separated by the anion exchange membrane on the anode side and the cation exchange membrane on the cathode side is a desalting chamber; on the contrary, the space separated by the cation exchange membrane on the anode side and the anion exchange membrane on the cathode side is a concentration chamber; the anode water chamber on the anode side is connected with an anode liquid tank (10), and the cathode water chamber on the cathode side is connected with a cathode liquid tank (12); the concentrating chamber is connected with a concentrated liquid tank (8).
3. The system for utilizing electrodialysis resource to utilize concentrated brine according to claim 2, wherein: 100 pairs of ion exchange membranes are arranged in the electrodialysis tank (6); film size 1120 x 550 mm.
4. The system for utilizing electrodialysis resource to utilize concentrated brine according to claim 2, wherein: the hydrochloric acid tank (15) is connected with the concentrated solution tank (8) through a hydrochloric acid dosing pump I (16); the hydrochloric acid tank (15) is connected with the cathode liquid tank (12) through a hydrochloric acid dosing pump II (17).
5. The system for utilizing electrodialysis resource to utilize concentrated brine according to claim 1, wherein: solid Na2SO4 is added into the anode liquid tank (10).
6. The system for utilizing electrodialysis resource to utilize concentrated brine according to claim 1, wherein: the reverse osmosis strong brine collecting tank (1), the pre-desalting tank (4), the concentrated liquid tank (8), the anode liquid tank (10) and the cathode liquid tank (12) are all connected with a drainage ditch.
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| CN201921820206.3U CN212151922U (en) | 2019-10-28 | 2019-10-28 | System for utilize electrodialysis utilization strong brine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111377567A (en) * | 2019-10-28 | 2020-07-07 | 国电福州发电有限公司 | System and method for utilizing electrodialysis resource to utilize strong brine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111377567A (en) * | 2019-10-28 | 2020-07-07 | 国电福州发电有限公司 | System and method for utilizing electrodialysis resource to utilize strong brine |
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Address after: 350309 Jiangyin Town port Park, Fuqing City, Fuzhou City, Fujian Province Patentee after: Guoneng (Fuzhou) Thermal Power Co.,Ltd. Patentee after: BEIJING LUCENCY ENVIRO TECH Co.,Ltd. NANJING BRANCH Address before: 350309 Jiangyin Town port Park, Fuqing City, Fuzhou City, Fujian Province Patentee before: GUODIAN FUZHOU POWER GENERATION Co.,Ltd. Patentee before: BEIJING LUCENCY ENVIRO TECH Co.,Ltd. NANJING BRANCH |
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Effective date of registration: 20220725 Address after: 350309 Jiangyin Town port Park, Fuqing City, Fuzhou City, Fujian Province Patentee after: Guoneng (Fuzhou) Thermal Power Co.,Ltd. Patentee after: Guoneng langxinming Nanjing Environmental Protection Technology Co.,Ltd. Address before: 350309 Jiangyin Town port Park, Fuqing City, Fuzhou City, Fujian Province Patentee before: Guoneng (Fuzhou) Thermal Power Co.,Ltd. Patentee before: BEIJING LUCENCY ENVIRO TECH Co.,Ltd. NANJING BRANCH |