A bromine-containing waste liquid recovery device

Abstract

The utility model discloses a bromine-containing waste liquid recovery device, comprising a water inlet tank, a pressure microfiltration membrane assembly, a pH adjustment assembly, a microfiltration water production tank, a nanofiltration membrane assembly, a high-pressure nanofiltration membrane assembly, a reverse osmosis membrane assembly, a nanofiltration concentrated water tank, a nanofiltration water production tank, a reverse osmosis concentrated water tank, an electrodialysis assembly, a degassing tower, an electrodialysis concentrated water tank and a bipolar membrane assembly. The utility model solves the drawbacks of conventional traditional bromine recovery methods by using different component function combinations, and no other reagents need to be added during the recovery process, thereby reducing environmental pollution; the system effluent has only three types of recovery liquids (sodium carbonate solution, hydrobromic acid solution, sodium hydroxide solution), and the rest of the system effluents can be recycled and applied to the system process, thereby achieving optimal utilization of water resources.

Description

Technical Field

[0001] The utility model specifically relates to a bromine-containing waste liquid recovery device. Background Art

[0002] Bromine-containing waste liquid has high bromine value, but it also contains a large amount of other salts, and has the characteristics of large changes in water quality and quantity, and difficult separation of impurities. If the bromine-containing waste liquid is discharged, it will not only cause environmental pollution problems, but also waste a lot of resources. In addition, as an important raw material for the synthesis of fine chemicals and pharmaceutical intermediates, there are more than 4,500 artificially synthesized bromine compounds. With the development of science and technology, bromine will have more uses, so the call for resource reuse of bromine is becoming stronger.

[0003] In the prior art, organic waste gas containing multiple pollutants discharged from the oxidation reactor during the production of terephthalic acid (PTA) mainly consists of N2, O2, CO and brominated organic matter. After washing and debromination in a washing tower, the main components of the washed wastewater are bicarbonate ions, carbonate ions and bromide ions, and hydrogen bromide in the reaction stage needs to be continuously replenished due to consumption. The problem of recovering bromine in the bromine-containing wastewater has not been effectively solved. Utility Model Content

[0004] The utility model aims to provide a bromine-containing waste liquid recovery device.

[0005] The technical solution of the utility model is as follows:

[0006] A bromine-containing waste liquid recovery device comprises a water inlet tank, a pressure microfiltration membrane assembly, a pH adjustment assembly, a microfiltration water production tank, a nanofiltration membrane assembly, a high-pressure nanofiltration membrane assembly, a reverse osmosis membrane assembly, a nanofiltration concentrated water tank, a nanofiltration water production tank, a reverse osmosis concentrated water tank, an electrodialysis assembly, a degassing tower, an electrodialysis concentrated water tank, a bipolar membrane assembly, an acid tank and an alkali tank.

[0007] The water inlet of the water inlet tank is connected to the external water inlet, the water outlet of the water inlet tank is connected to the water inlet end of the pressure type microfiltration membrane assembly through the ultrafiltration water inlet pump, the water production end of the pressure type microfiltration membrane assembly is connected to the water inlet of the microfiltration water production tank, the water outlet of the microfiltration water production tank is connected to the pH adjustment component, the alkali solution enters the pH adjustment component through the external pipe gallery, the water outlet of the pH adjustment component is connected to the water inlet of the nanofiltration membrane assembly through a nanofiltration water inlet pump, the concentrated water end of the nanofiltration membrane assembly is connected to the nanofiltration concentrated water tank, the water outlet of the nanofiltration membrane concentrated water tank is connected to the water inlet end of the high-pressure nanofiltration membrane assembly through a high-pressure nanofiltration water inlet pump, the water production end of the high-pressure nanofiltration membrane assembly is connected to the microfiltration water production tank, and the concentrated water end of the high-pressure nanofiltration membrane assembly is connected to the downstream process to realize the recovery of the sodium carbonate solution;

[0008] The water production end of the nanofiltration membrane assembly is connected to the water inlet of the nanofiltration water production tank, and the water outlet of the nanofiltration water production tank is connected to the water inlet end of the reverse osmosis membrane assembly through a reverse osmosis high-pressure pump. The water production end of the reverse osmosis membrane assembly is discharged from the utility model, the concentrated water end of the reverse osmosis membrane assembly is connected to the water inlet of the reverse osmosis concentrated water tank, and the water outlet of the reverse osmosis concentrated water tank is connected to the water inlet end of the electrodialysis assembly through an electrodialysis water inlet pump. The water production end of the electrodialysis assembly can be optionally connected to the reverse osmosis concentrated water tank and / or the nanofiltration water production tank, the concentrated water end of the electrodialysis assembly is connected to the water inlet of the degassing tower, the water outlet of the degassing tower is connected to the water inlet of the electrodialysis concentrated water tank, and the water outlet of the electrodialysis concentrated water tank is connected to the feed port of the bipolar membrane assembly through a bipolar membrane water inlet pump, so as to realize the recovery of hydrobromic acid solution and sodium hydroxide solution through the bipolar membrane assembly.

[0009] In a preferred embodiment of the present invention, the nanofiltration membrane assembly is a multi-stage nanofiltration membrane assembly.

[0010] Further preferably, the multi-stage nanofiltration membrane assembly includes a first-stage nanofiltration water inlet tank, a first-stage nanofiltration membrane assembly, a second-stage nanofiltration water inlet tank, a second-stage nanofiltration membrane assembly, a third-stage nanofiltration water inlet tank, a third-stage nanofiltration membrane assembly, a fourth-stage nanofiltration water inlet tank, and a fourth-stage nanofiltration membrane assembly;

[0011] The raw material liquid enters the water inlet of the first-stage nanofiltration water inlet tank, the water outlet of the first-stage nanofiltration water inlet tank is connected to the water inlet end of the first-stage nanofiltration membrane assembly through the first-stage nanofiltration water inlet pump, the concentrated water end of the first-stage nanofiltration membrane assembly is connected to the fourth-stage nanofiltration water inlet tank, the water production end of the first-stage nanofiltration is connected to the water inlet of the second-stage nanofiltration water inlet tank, the water outlet of the second-stage nanofiltration water inlet tank is connected to the water inlet end of the second-stage nanofiltration membrane assembly through the second-stage nanofiltration water inlet pump, the concentrated water end of the second-stage nanofiltration membrane assembly is connected to the water inlet of the fourth-stage nanofiltration water inlet tank, the water production end of the second-stage nanofiltration is connected to the water inlet of the third-stage nanofiltration water inlet tank, the water outlet of the third-stage nanofiltration water inlet tank is connected to the water inlet end of the third-stage nanofiltration membrane assembly through the third-stage nanofiltration water inlet pump, the concentrated water end of the third-stage nanofiltration membrane assembly is connected to the water inlet of the second-stage nanofiltration water inlet tank, and the water production end of the third-stage nanofiltration membrane assembly is connected to the next section, that is, the water inlet of the above-mentioned nanofiltration water production tank. The water outlet of the four-stage nanofiltration water inlet tank is connected to the water inlet end of the four-stage nanofiltration membrane assembly through a four-stage nanofiltration water inlet pump, and the water production end of the four-stage nanofiltration membrane assembly is connected to the water inlet of the two-stage nanofiltration water inlet tank. The output of the concentrated water end of the four-stage nanofiltration membrane assembly is the prepared sodium carbonate solution, which flows into the nanofiltration concentrated water tank.

[0012] In a preferred embodiment of the present invention, the bipolar membrane assembly is a three-chamber bipolar membrane assembly.

[0013] Further preferably, the three-chamber bipolar membrane assembly comprises a raw material tank, an alkali tank, an acid tank, a polar tank and a bipolar membrane unit;

[0014] The water outlet of the above-mentioned electrodialysis concentrated water tank is connected to the water inlet of the above-mentioned raw material tank through a bipolar membrane water inlet pump, and the water outlet of the raw material tank is connected to the feed liquid inlet of the bipolar membrane unit through a feed liquid circulation pump, a feed liquid security filter and a feed liquid heat exchanger in turn; the water outlet of the alkali tank is connected to the alkali liquid inlet of the bipolar membrane unit through an alkali liquid circulation pump, an alkali liquid security filter and an alkali liquid heat exchanger in turn; the water outlet of the acid tank is connected to the acid liquid inlet of the bipolar membrane unit through an acid liquid circulation pump, an acid liquid security filter and an acid liquid heat exchanger in turn; the water outlet of the pole tank is connected to the pole liquid inlet of the bipolar membrane unit through a pole liquid circulation pump, a pole liquid security filter and a pole liquid heat exchanger in turn; the feed liquid outlet, alkali liquid outlet, acid liquid outlet and pole liquid outlet of the bipolar membrane unit are respectively connected to the water inlet of the raw material tank, the water inlet of the alkali tank, the water inlet of the acid tank and the water inlet of the pole tank.

[0015] More preferably, the water outlet of the alkali tank is connected to the pH adjustment component.

[0016] More preferably, the feed liquid outlet of the bipolar membrane unit is connected to the electrodialysis concentrate tank.

[0017] In a preferred embodiment of the present invention, the filtration accuracy of the pressure microfiltration membrane assembly is 0.01-0.2 μm.

[0018] In a preferred embodiment of the present invention, the membrane stack in the electrodialysis assembly is a homogeneous membrane stack or an alloy membrane stack.

[0019] The beneficial effects of the utility model are:

[0020] 1. The utility model solves the drawbacks of conventional traditional bromine recovery methods by using a combination of different component functions, and does not require the addition of other reagents during the recovery process, thereby reducing pollution to the environment; the system effluent has only three types of recovery liquids (sodium carbonate solution, hydrobromic acid solution, and sodium hydroxide solution), and the remaining system effluents can be recycled and applied to the system process, thereby achieving optimal utilization of water resources.

[0021] 2. The pressure-type microfiltration membrane assembly in the utility model can remove insoluble matter in bromine-containing waste liquid to obtain microfiltration clear liquid, thereby avoiding clogging of the nanofiltration membrane assembly in subsequent processes.

[0022] 3. In the utility model, the bromide ions and carbonate ions in the feed liquid after being concentrated by the pressure-type microfiltration membrane component and adjusted by the pH adjustment component are separated by the nanofiltration membrane through the nanofiltration membrane component. The produced water obtained at the water production end of the nanofiltration membrane component has a high concentration of bromide ions. After being further concentrated by the downstream reverse osmosis membrane component and the electrodialysis component, the produced water contains a higher concentration of sodium bromide, and then serves as the inlet water of the bipolar membrane component. It is dissociated into hydrobromic acid and sodium hydroxide through the action of the bipolar membrane system for recovery; the concentrated water obtained at the concentrated water end of the nanofiltration membrane component has a high concentration of carbonate ions. The concentrated water is further concentrated by the downstream high-pressure nanofiltration membrane component, and the obtained concentrated water is a high-concentration sodium carbonate solution for recovery.

[0023] 4. The nanofiltration membrane assembly of the utility model is preferably a multi-stage nanofiltration membrane assembly, so that both the produced water and the concentrated water are subjected to multi-stage filtration to improve the separation degree of monovalent ions and divalent ions, so that the target ions in the concentrated water and the produced water are further concentrated, which is beneficial to the efficient operation of the subsequent processes.

[0024] 5. The pH adjustment component in the utility model can accurately control the concentration of the added alkali to achieve high efficiency and high yield of the nanofiltration membrane component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] Figure 2 It is a schematic structural diagram of the nanofiltration membrane assembly of the utility model.

[0027] Figure 3 It is a schematic structural diagram of the electrodialysis component of the utility model. DETAILED DESCRIPTION

[0028] The technical solution of the present utility model is further illustrated and described below through specific implementation modes in combination with the accompanying drawings.

[0029] like Figure 1 As shown, a bromine-containing waste liquid recovery device includes a water inlet tank 81, a pressure microfiltration membrane assembly 1 (filtration accuracy is 0.01-0.2μm), a pH adjustment assembly 2, a microfiltration water production tank 82, a nanofiltration membrane assembly 3, a high-pressure nanofiltration membrane assembly 4, a reverse osmosis membrane assembly 5, a nanofiltration concentrated water tank 83, a nanofiltration water production tank 84, a reverse osmosis concentrated water tank 85, an electrodialysis assembly 6 (the membrane stack is a homogeneous membrane stack or an alloy membrane stack), a degassing tower 86, an electrodialysis concentrated water tank 87 and a bipolar membrane assembly 7.

[0030] The water inlet of the water inlet tank 81 is connected to the external water (i.e., bromine-containing waste liquid), the water outlet of the water inlet tank 81 is connected to the water inlet end of the pressure-type microfiltration membrane assembly 1 through the ultrafiltration water inlet pump 91, the water production end of the pressure-type microfiltration membrane assembly is connected to the water inlet of the microfiltration water production tank 82, the water outlet of the microfiltration water production tank 82 is connected to the pH adjustment assembly 2, the alkali solution enters the pH adjustment assembly 2 through the external pipeline gallery, the water outlet of the pH adjustment assembly 2 is connected to the water inlet of the nanofiltration membrane assembly 3 through a nanofiltration water inlet pump 92, the concentrated water end of the nanofiltration membrane assembly 3 is connected to the nanofiltration concentrated water tank 83, the water outlet of the nanofiltration membrane concentrated water tank is connected to the water inlet end of the high-pressure nanofiltration membrane assembly 4 through a high-pressure nanofiltration water inlet pump 93, the water production end of the high-pressure nanofiltration membrane assembly 4 is connected to the microfiltration water production tank 82, the concentrated water end of the high-pressure nanofiltration membrane assembly 4 is connected to the downstream process, and the feed liquid obtained at the concentrated water end of the high-pressure nanofiltration membrane assembly 4 is a high-concentration sodium carbonate solution, that is, the sodium carbonate solution is recovered.

[0031] The water production end of the nanofiltration membrane assembly 3 is connected to the water inlet of the nanofiltration water production tank 84, and the water outlet of the nanofiltration water production tank 84 is connected to the water inlet end of the reverse osmosis membrane assembly 5 through a reverse osmosis high-pressure pump 94. The water production end of the reverse osmosis membrane assembly 5 discharges the present invention (which can be used as spray water), and the concentrated water end of the reverse osmosis membrane assembly 5 is connected to the water inlet of the reverse osmosis concentrated water tank 85. The water outlet of the reverse osmosis concentrated water tank 85 is connected to the water inlet end of the electrodialysis assembly 6 through the electrodialysis water inlet pump 95. The water production end of the electrodialysis assembly 6 can be optionally connected to the reverse osmosis concentrated water tank 8 5 (i.e., the water inlet end of the electrodialysis component 6) and / or the nanofiltration water production tank 84 (i.e., the water inlet end of the reverse osmosis membrane component 5), the concentrated water end of the electrodialysis component 6 is connected to the water inlet of the degassing tower 86, the water outlet of the degassing tower 86 is connected to the water inlet of the electrodialysis concentrated water tank 87, the water outlet of the electrodialysis concentrated water tank 87 is connected to the feed inlet of the bipolar membrane component 7 through the bipolar membrane water inlet pump 96, and the feed liquid outlet of the bipolar membrane component 7 is connected to the electrodialysis concentrated water tank 87, so as to realize the recovery of hydrobromic acid solution and sodium hydroxide solution through the bipolar membrane component 7.

[0032] The function of the nanofiltration membrane assembly 3 is to separate the bromide ions and carbonate ions in the feed liquid after being concentrated by the pressure-type microfiltration membrane assembly and adjusted by the pH adjustment assembly 2 through the nanofiltration membrane. The produced water obtained at the water production end of the nanofiltration membrane assembly 3 has a high concentration of bromide ions. After further concentration by the downstream reverse osmosis membrane assembly 5 and the electrodialysis assembly 6, the produced water contains a higher concentration of sodium bromide, and then serves as the inlet water of the bipolar membrane assembly 7. Through the action of the bipolar membrane system, it is dissociated into hydrobromic acid and sodium hydroxide for recovery. The concentrated water obtained at the concentrated water end of the nanofiltration membrane assembly 3 has a high concentration of carbonate ions. The concentrated water is further concentrated by the downstream high-pressure nanofiltration membrane assembly 4, and the concentrated water obtained is a high-concentration sodium carbonate solution for recovery.

[0033] The function of the pH adjustment component 2 is to adjust the pH of the inlet water of the nanofiltration membrane component 3 to be less than or equal to 11. This is because the nanofiltration separation effect of the feed liquid is poor when the pH is about 8. The feed liquid obtained by adding an alkaline solution to adjust the pH is conducive to the retention of carbonate ions by the nanofiltration membrane component 3, and bromide ions can effectively penetrate the nanofiltration membrane of the nanofiltration membrane component 3, thereby separating bromide ions from carbonate ions. Thus, hydrobromic acid solution and sodium hydroxide solution with higher purity can be recovered. Further, based on the ion balance of the solution, excess alkali can promote the complete conversion of bicarbonate into carbonate and improve the separation efficiency. Therefore, maintaining the concentration of alkali at a higher level can increase the yield of sodium carbonate. Further, with the addition of alkali, the salinity of the inlet water continues to increase, and the high ion concentration will also reduce the attraction or repulsion between the nanofiltration membrane and the charged particles, thereby reducing the retention rate of the solute. In other words, an excessively high alkali concentration will cause a sharp decrease in water flux and reduce the retention rate of the nanofiltration membrane for ions, which greatly affects the working performance of the nanofiltration membrane component 3. Therefore, the concentration of the added alkali can be accurately controlled by the pH adjustment component 2 to simultaneously achieve high efficiency and high yield of the nanofiltration membrane component 3 .

[0034] like Figure 1 and Figure 2 As shown, the above-mentioned nanofiltration membrane assembly 3 is preferably a multi-stage nanofiltration membrane assembly 3, including a first-stage nanofiltration water inlet tank 310, a first-stage nanofiltration membrane assembly 31, a second-stage nanofiltration water inlet tank 320, a second-stage nanofiltration membrane assembly 32, a third-stage nanofiltration water inlet tank 330, a third-stage nanofiltration membrane assembly 33, a fourth-stage nanofiltration water inlet tank 340, and a fourth-stage nanofiltration membrane assembly 34.

[0035] The raw material liquid enters the water inlet of the first-stage nanofiltration water inlet tank 310, and the water outlet of the first-stage nanofiltration water inlet tank 310 is connected to the water inlet end of the first-stage nanofiltration membrane assembly 31 through the first-stage nanofiltration water inlet pump 311. The concentrated water end of the first-stage nanofiltration membrane assembly 31 is connected to the fourth-stage nanofiltration water inlet tank 340, and the water production end of the first-stage nanofiltration is connected to the water inlet of the second-stage nanofiltration water inlet tank 320. The water outlet of the second-stage nanofiltration water inlet tank 320 is connected to the water inlet end of the second-stage nanofiltration membrane assembly 32 through the second-stage nanofiltration water inlet pump 321. The concentrated water end of the filter membrane assembly 32 is connected to the water inlet of the fourth-stage nanofiltration water inlet tank 340, the water production end of the secondary nanofiltration is connected to the water inlet of the third-stage nanofiltration water inlet tank 330, the water outlet of the third-stage nanofiltration water inlet tank 330 is connected to the water inlet end of the third-stage nanofiltration membrane assembly 33 through the third-stage nanofiltration water inlet pump 331, the concentrated water end of the third-stage nanofiltration membrane assembly 33 is connected to the water inlet of the second-stage nanofiltration water inlet tank 320, and the water production end of the third-stage nanofiltration membrane assembly 33 is connected to the next work section, that is, the water inlet of the above-mentioned nanofiltration water production tank 84. The water outlet of the fourth-stage nanofiltration water inlet tank 340 is connected to the water inlet end of the fourth-stage nanofiltration membrane assembly 34 through the fourth-stage nanofiltration water inlet pump 341, and the water production end of the fourth-stage nanofiltration membrane assembly 34 is connected to the water inlet of the second-stage nanofiltration water inlet tank 320. The output of the concentrated water end of the fourth-stage nanofiltration membrane assembly 34 is the prepared sodium carbonate solution, which flows into the above-mentioned nanofiltration concentrated water tank 83.

[0036] like Figure 1 and Figure 3 As shown, the bipolar membrane assembly 7 is a three-chamber bipolar membrane assembly, which has a raw material tank 71 , an alkali tank 72 , an acid tank 73 , a pole tank 74 and a bipolar membrane unit 75 .

[0037] The water outlet of the electrodialysis concentrated water tank 87 is connected to the water inlet of the raw material tank 71 through the bipolar membrane water inlet pump 96, and the water outlet of the raw material tank 71 is connected to the liquid inlet of the bipolar membrane unit 75 through a liquid circulation pump 711, a liquid security filter 712 and a liquid heat exchanger 713 in turn; the water outlet of the alkali tank 72 is connected to the alkali inlet of the bipolar membrane unit 75 through an alkali circulation pump 721, an alkali security filter 722 and an alkali heat exchanger 723 in turn; the water outlet of the acid tank 73 is connected to the alkali inlet of the bipolar membrane unit 75 through an acid circulation pump 721, an alkali security filter 722 and an alkali heat exchanger 723 in turn; The circulation pump 731, an acid liquid security filter 732 and an acid liquid heat exchanger 733 are connected to the acid liquid inlet of the bipolar membrane unit 75; the water outlet of the polar tank 74 is connected to the polar liquid inlet of the bipolar membrane unit 75 through a polar liquid circulation pump 741, a polar liquid security filter 742 and a polar liquid heat exchanger 743 in sequence; the feed liquid outlet, alkali liquid outlet, acid liquid outlet and polar liquid outlet of the bipolar membrane unit 75 are respectively connected to the water inlet of the raw material tank 71, the water inlet of the alkali tank 72, the water inlet of the acid tank 73 and the water inlet of the polar tank 74. The water outlet of the alkali tank 72 is also connected to the pH adjustment component 2. The dilute water outlet of the bipolar membrane unit 75 is connected to the electrodialysis concentrated water tank 87. The alkali liquid obtained from the alkali liquid outlet of the bipolar membrane unit 75 is a sodium hydroxide solution, and the acid liquid obtained from the acid liquid outlet of the bipolar membrane unit 75 is a hydrobromic acid solution.

[0038] The arrangement of the bipolar membrane assembly 7 specifically realizes the circulation of the feed liquid from the storage tank to the bipolar membrane assembly 7 and the electrodialysis assembly 6. During operation, the feed liquid circulates between the bipolar membrane assembly 7 and the electrodialysis assembly 6, and when the feed liquid in the storage tank reaches the required requirements, such as a specific pH or conductivity, the product can be harvested. This circulation can produce products that meet the requirements through the coordinated use of the bipolar membrane assembly 7 and the electrodialysis assembly 6, saving the investment in production equipment.

[0039] The utility model solves the drawbacks of conventional traditional bromine recovery methods by using a combination of different component functions, and does not require the addition of other reagents during the recovery process, thereby reducing pollution to the environment; the system effluent has only three types of recovery liquids (sodium carbonate solution, hydrobromic acid solution, and sodium hydroxide solution), and the remaining system effluents can be recycled and applied to the system process, thereby achieving optimal utilization of water resources.

[0040] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope covered by the present invention.

Claims

1. A bromine-containing waste liquid recovery device, characterized in that: It includes a water inlet tank, a pressure microfiltration membrane assembly, a pH adjustment assembly, a microfiltration water production tank, a nanofiltration membrane assembly, a high-pressure nanofiltration membrane assembly, a reverse osmosis membrane assembly, a nanofiltration concentrated water tank, a nanofiltration water production tank, a reverse osmosis concentrated water tank, an electrodialysis assembly, a degassing tower, an electrodialysis concentrated water tank and a bipolar membrane assembly; The water inlet of the water inlet tank is connected to the external water inlet, the water outlet of the water inlet tank is connected to the water inlet end of the pressure type microfiltration membrane assembly through the ultrafiltration water inlet pump, the water production end of the pressure type microfiltration membrane assembly is connected to the water inlet of the microfiltration water production tank, the water outlet of the microfiltration water production tank is connected to the pH adjustment component, the alkali solution enters the pH adjustment component through the external pipe gallery, the water outlet of the pH adjustment component is connected to the water inlet of the nanofiltration membrane assembly through a nanofiltration water inlet pump, the concentrated water end of the nanofiltration membrane assembly is connected to the nanofiltration concentrated water tank, the water outlet of the nanofiltration membrane concentrated water tank is connected to the water inlet end of the high-pressure nanofiltration membrane assembly through a high-pressure nanofiltration water inlet pump, the water production end of the high-pressure nanofiltration membrane assembly is connected to the microfiltration water production tank, and the concentrated water end of the high-pressure nanofiltration membrane assembly is connected to the downstream process to realize the recovery of the sodium carbonate solution; The water production end of the nanofiltration membrane assembly is connected to the water inlet of the nanofiltration water production tank, the water outlet of the nanofiltration water production tank is connected to the water inlet end of the reverse osmosis membrane assembly through a reverse osmosis high-pressure pump, the water production end of the reverse osmosis membrane assembly is discharged from the bromine-containing waste liquid recovery equipment, the concentrated water end of the reverse osmosis membrane assembly is connected to the water inlet of the reverse osmosis concentrated water tank, the water outlet of the reverse osmosis concentrated water tank is connected to the water inlet end of the electrodialysis assembly through an electrodialysis water inlet pump, the water production end of the electrodialysis assembly can be optionally connected to the reverse osmosis concentrated water tank and / or the nanofiltration water production tank, the concentrated water end of the electrodialysis assembly is connected to the water inlet of the degassing tower, the water outlet of the degassing tower is connected to the water inlet of the electrodialysis concentrated water tank, and the water outlet of the electrodialysis concentrated water tank is connected to the feed port of the bipolar membrane assembly through a bipolar membrane water inlet pump, so as to realize the recovery of hydrobromic acid solution and sodium hydroxide solution through the bipolar membrane assembly.

2. A bromine-containing waste liquid recovery device as claimed in claim 1, characterized in that: The nanofiltration membrane assembly is a multi-stage nanofiltration membrane assembly.

3. A bromine-containing waste liquid recovery device as claimed in claim 2, characterized in that: The multi-stage nanofiltration membrane assembly comprises a first-stage nanofiltration water inlet tank, a first-stage nanofiltration membrane assembly, a second-stage nanofiltration water inlet tank, a second-stage nanofiltration membrane assembly, a third-stage nanofiltration water inlet tank, a third-stage nanofiltration membrane assembly, a fourth-stage nanofiltration water inlet tank, and a fourth-stage nanofiltration membrane assembly; The raw material liquid enters the water inlet of the first-stage nanofiltration water inlet tank, the water outlet of the first-stage nanofiltration water inlet tank is connected to the water inlet end of the first-stage nanofiltration membrane assembly through the first-stage nanofiltration water inlet pump, the concentrated water end of the first-stage nanofiltration membrane assembly is connected to the fourth-stage nanofiltration water inlet tank, the water production end of the first-stage nanofiltration is connected to the water inlet of the second-stage nanofiltration water inlet tank, the water outlet of the second-stage nanofiltration water inlet tank is connected to the water inlet end of the second-stage nanofiltration membrane assembly through the second-stage nanofiltration water inlet pump, the concentrated water end of the second-stage nanofiltration membrane assembly is connected to the water inlet of the fourth-stage nanofiltration water inlet tank, the water production end of the second-stage nanofiltration is connected to the water inlet of the third-stage nanofiltration water inlet tank, The water outlet is connected to the water inlet end of the third-stage nanofiltration membrane assembly through a third-stage nanofiltration water inlet pump, the concentrated water end of the third-stage nanofiltration membrane assembly is connected to the water inlet of the second-stage nanofiltration water inlet tank, and the water production end of the third-stage nanofiltration membrane assembly is connected to the next work section, that is, the water inlet of the above-mentioned nanofiltration water production tank; the water outlet of the fourth-stage nanofiltration water inlet tank is connected to the water inlet end of the fourth-stage nanofiltration membrane assembly through a fourth-stage nanofiltration water inlet pump, and the water production end of the fourth-stage nanofiltration membrane assembly is connected to the water inlet of the second-stage nanofiltration water inlet tank, and the output of the concentrated water end of the fourth-stage nanofiltration membrane assembly is the prepared sodium carbonate solution, which flows into the nanofiltration concentrated water tank.

4. A bromine-containing waste liquid recovery device as claimed in claim 1, characterized in that: The bipolar membrane assembly is a three-chamber bipolar membrane assembly.

5. A bromine-containing waste liquid recovery device as claimed in claim 4, characterized in that: The three-chamber bipolar membrane assembly comprises a raw material tank, an alkali tank, an acid tank, a polar tank and a bipolar membrane unit; The water outlet of the above-mentioned electrodialysis concentrated water tank is connected to the water inlet of the above-mentioned raw material tank through a bipolar membrane water inlet pump, and the water outlet of the raw material tank is connected to the feed liquid inlet of the bipolar membrane unit through a feed liquid circulation pump, a feed liquid security filter and a feed liquid heat exchanger in turn; the water outlet of the alkali tank is connected to the alkali liquid inlet of the bipolar membrane unit through an alkali liquid circulation pump, an alkali liquid security filter and an alkali liquid heat exchanger in turn; the water outlet of the acid tank is connected to the acid liquid inlet of the bipolar membrane unit through an acid liquid circulation pump, an acid liquid security filter and an acid liquid heat exchanger in turn; the water outlet of the pole tank is connected to the pole liquid inlet of the bipolar membrane unit through a pole liquid circulation pump, a pole liquid security filter and a pole liquid heat exchanger in turn; the feed liquid outlet, alkali liquid outlet, acid liquid outlet and pole liquid outlet of the bipolar membrane unit are respectively connected to the water inlet of the raw material tank, the water inlet of the alkali tank, the water inlet of the acid tank and the water inlet of the pole tank.

6. A bromine-containing waste liquid recovery device as claimed in claim 5, characterized in that: The water outlet of the alkali tank is connected to the pH adjustment component.

7. A bromine-containing waste liquid recovery device as claimed in claim 5, characterized in that: The feed liquid outlet of the bipolar membrane unit is communicated with the electrodialysis concentrated water tank.

8. A bromine-containing waste liquid recovery device as claimed in any one of claims 1 to 7, characterized in that: The filtration accuracy of the pressure microfiltration membrane assembly is 0.01-0.2 μm.

9. A bromine-containing waste liquid recovery device as claimed in any one of claims 1 to 7, characterized in that: The membrane stack in the electrodialysis component is a homogeneous membrane stack or an alloy membrane stack.

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