Three-stage chamber salt acid-alkali treatment equipment based on electrochemical reaction

Abstract

The utility model relates to three-stage chamber salt acid-alkali treatment equipment based on electrochemical reaction, which comprises a plurality of three-stage chamber electrochemical reaction units which are communicated with one another, and each three-stage chamber electrochemical reaction unit is provided with three independent chambers which are separated by an electrolytic diaphragm, the three independent chambers comprise an anode reaction chamber, a desalting chamber and a cathode reaction chamber which are sequentially arranged, an anode bar is arranged in the anode reaction chamber, and a cathode bar is arranged in the cathode reaction chamber; water inlets are formed in the side walls of the lower parts of the anode reaction chamber, the desalination chamber and the cathode reaction chamber, water outlets are formed in the side walls of the upper parts of the anode reaction chamber, the desalination chamber and the cathode reaction chamber, and the desalination chamber water inlet is used for allowing salt-containing wastewater to enter and be discharged through the desalination chamber water outlet after the salt-containing wastewater is subjected to desalination treatment in the desalination chamber; the water outlet of the anode chamber is communicated with a strong acid liquid box, and the water outlet of the cathode chamber is communicated with an alkali liquor settling box. The method has the effects of realizing resourceful treatment of the salt-containing wastewater, improving the water treatment efficiency of the salt-containing wastewater and reducing the water treatment cost.

Description

Technical Field

[0001] This application relates to the fields of electrochemical water treatment and saline wastewater resource utilization treatment, and in particular to a three-stage chamber salt and acid-base treatment device based on electrochemical reaction. Background Technology

[0002] Electrochemical reactions have been widely applied in wastewater treatment. In saline wastewater, cations such as sodium, potassium, calcium, magnesium, and other high-valence metal cations migrate towards the cathode under the influence of an electric field, where an electrochemical reaction occurs to generate hydroxide ions. Anions in saline wastewater, such as chloride, sulfate, and bicarbonate ions, migrate towards the anode under the influence of an electric field, where chlorine or oxygen evolution reactions occur, producing chlorine or oxygen gas. Resource recovery from saline wastewater is a developing trend, and using electrochemical reactions to treat saline wastewater can convert its various components into valuable products, thus achieving resource recovery. Utility Model Content

[0003] The purpose of this invention is to realize the resource utilization of saline wastewater through electrochemical water treatment technology, and to propose a three-stage saline-acid-alkali treatment device based on electrochemical reaction.

[0004] To achieve the resource utilization of saline wastewater, this utility model provides the following technical solution based on electrochemical reaction:

[0005] A three-stage electrochemical reaction-based salt and acid / alkali treatment device includes multiple interconnected three-stage electrochemical reaction units. Each three-stage electrochemical reaction unit has three independent chambers separated by an electrolytic membrane. The three independent chambers include an anode reaction chamber, a desalination chamber, and a cathode reaction chamber arranged sequentially. An anode rod is installed in the anode reaction chamber, and a cathode rod is installed in the cathode reaction chamber. Water inlets are provided on the lower side walls of the anode reaction chamber, desalination chamber, and cathode reaction chamber, and water outlets are provided on the upper side walls of the anode reaction chamber, desalination chamber, and cathode reaction chamber. The water inlet of the desalination chamber is used for the entry of saline wastewater, which is then desalinated in the desalination chamber and discharged through the desalination chamber outlet. The water outlet of the anode chamber is connected to a strong acid tank, and the water outlet of the cathode chamber is connected to an alkali precipitation tank.

[0006] Preferably, the system further includes a weak acid tank and a weak alkali tank. The anode chamber inlets of the multiple three-chamber electrochemical reaction units are connected through a main anode chamber inlet pipe, which is connected to the weak acid tank. The anode chamber outlets of the multiple three-chamber electrochemical reaction units are connected through a main anode chamber outlet pipe, which is connected to the strong acid tank. The cathode chamber inlets of the multiple three-chamber electrochemical reaction units are connected through a main cathode chamber inlet pipe, which is connected to the weak alkali tank. The cathode chamber outlets of the multiple three-chamber electrochemical reaction units are connected through a main cathode chamber outlet pipe, which is connected to the alkali precipitation tank.

[0007] Furthermore, the top of the strong acid tank is connected to a chlorine recovery device, and the outlet of the strong acid tank is connected to an acid utilization module.

[0008] Furthermore, the bottom of the alkali sedimentation tank is provided with a discharge port and is connected to a filter press through the discharge port. The upper outer wall of the alkali sedimentation tank is provided with an upper discharge port, which is used to connect to a clear alkali tank for discharging the supernatant in the alkali sedimentation tank. The clear alkali tank is connected to an alkali utilization module.

[0009] Preferably, each of the cathode rods and anode rods in the three-stage electrochemical reaction unit is electrically connected to a digital voltmeter.

[0010] Preferably, the anode terminals of the anode rods and the cathode terminals of the cathode rods of the plurality of the three-stage electrochemical reaction units are connected in series and electrically connected to a high-frequency DC power supply.

[0011] Compared with existing technologies, the three-stage salt and acid-base treatment device based on electrochemical reaction of this invention has the following beneficial technical effects:

[0012] 1. This utility model utilizes a three-electrode electrochemical reaction device to treat saline wastewater. The anions and cations in the saline wastewater enter the anode reaction chamber and the cathode reaction chamber respectively and are transformed into alkaline solution and acid solution. The saline wastewater, after the removal of anions and cations, meets the water quality requirements for industrial reuse and can be reused. The acid solution and alkaline solution are respectively converted into valuable products through the acid solution utilization module and the alkaline solution utilization module, thereby realizing the resource-based treatment of saline wastewater. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a three-stage salt and acid treatment device based on electrochemical reaction provided by this utility model;

[0014] Figure 2 This is a schematic diagram of the inlet and outlet water connection of the three-chamber electrochemical reaction unit provided by this utility model;

[0015] Figure 3This is a schematic diagram showing the connection between the three-chamber electrochemical reaction unit and the digital voltmeter provided by this utility model;

[0016] Figure 4 This is a schematic diagram of the power supply connection of the three-chamber electrochemical reaction unit provided by this utility model;

[0017] Figure labels: 1. Anode reaction chamber; 2. Cathode reaction chamber; 3. Desalination chamber; 4. Anode chamber inlet; 5. Cathode chamber inlet; 6. Anode chamber outlet; 7. Cathode chamber outlet; 8. Electrolytic diaphragm (cationic membrane); 9. Electrolytic diaphragm (anionic membrane); 10. Desalination chamber inlet; 11. Desalination chamber outlet; 12. Anode chamber main inlet pipe; 13. Cathode chamber main inlet pipe; 14. Anode chamber main outlet pipe; 15. Cathode chamber main outlet pipe; 16. Weak acid tank; 17. Weak alkali tank; 18. Strong acid tank; 19. Alkali sedimentation tank; 20. Acid utilization module; 21. Chlorine recovery device; 22. Filter press; 23. Alkali tank; 24. Alkali utilization module; 25. High-frequency DC power supply; 26. Cathode terminal; 27. Anode terminal; 28. Cathode terminal block; 29. ​​Anode terminal block; 30. Digital voltmeter. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The use of terms such as "a" or "an" in this patent application specification and claims does not indicate a limitation of quantity, but rather indicates the presence of at least one.

[0020] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0021] This application discloses a three-stage chamber salt and acid / alkali treatment device based on electrochemical reaction.

[0022] Reference Figure 1A three-stage electrochemical reaction-based salt and acid / alkali treatment device includes multiple interconnected three-stage electrochemical reaction units. Each three-stage electrochemical reaction unit has three independent chambers separated by an electrolytic membrane. The three independent chambers include an anode reaction chamber 1, a desalination chamber 3, and a cathode reaction chamber 2 arranged sequentially. The anode reaction chamber 1 and the desalination chamber 3 are separated by an electrolytic membrane 8, and the cathode reaction chamber 2 and the desalination chamber 3 are separated by an electrolytic membrane 9. An anode rod is installed in the anode reaction chamber 1, and the anode terminal 27 of the anode rod extends out of the anode reaction chamber 1. A cathode rod is installed in the cathode reaction chamber 2, and the cathode terminal 26 of the cathode rod extends out of the cathode reaction chamber 2. An electrochemical anodic reaction is realized in the anode reaction chamber 1 to generate acid, and an electrochemical cathodic reaction is realized in the cathode reaction chamber 2 to generate alkali. In the desalination chamber 3, saline wastewater is desalinated to generate fresh water. In this embodiment, the installation and application of the cathode rod and the anode rod are existing technologies and will not be described in detail.

[0023] Reference Figure 1 and Figure 2 The lower sidewalls of the anode reaction chamber 1, desalination chamber 3, and cathode reaction chamber 2 are integrally formed with water inlets, and the upper sidewalls of the anode reaction chamber 1, desalination chamber 3, and cathode reaction chamber 2 are integrally formed with water outlets. The water inlet of the desalination chamber 3 is used for the entry of saline wastewater, which is then discharged through the water outlet of the desalination chamber 3 after desalination treatment in the desalination chamber 3. The water outlets 6 of the anode chambers of the multiple three-stage electrochemical reaction units are interconnected and flow into the strong acid tank 18. The water outlets 7 of the cathode chambers of the multiple three-stage electrochemical reaction units are interconnected and flow into the alkaline sedimentation tank 19.

[0024] Furthermore, a three-stage salt and acid-base treatment device based on electrochemical reaction also includes a weak acid tank 16 and a weak alkali tank 17. The anode chamber inlets 4 of multiple three-stage electrochemical reaction units are connected through an anode chamber water inlet manifold 12, which is connected to the weak acid tank 16. The anode chamber outlets 6 of multiple three-stage electrochemical reaction units are connected through an anode chamber water outlet manifold 14, which is connected to the strong acid tank 18. The cathode chamber inlets 5 of multiple three-stage electrochemical reaction units are connected through a cathode chamber water inlet manifold 13, which is connected to the weak alkali tank 17. The cathode chamber outlets 7 of multiple three-stage electrochemical reaction units are connected through a cathode chamber water outlet manifold 15, which is connected to the alkali precipitation tank 19.

[0025] Reference Figure 1The strong acid tank 18 is connected to a chlorine recovery device 21 at its top. The outlet of the strong acid tank 18 is connected to both the acid utilization module 20 and the weak acid tank 16. The strong acid tank 18 is connected to both the chlorine recovery device 21 and the acid utilization module 20. Chlorine gas generated by the electrochemical reaction escapes from the acid and is recycled through the chlorine recovery device 21. The acid generated by the electrochemical reaction is recycled through the acid utilization module 20. If the acidity is insufficient, the acid in the strong acid tank 18 returns to the weak acid tank 16 and re-enters the anode reaction chamber 1 to further increase the acidity. In this embodiment, the chlorine recovery device 21 can be a device that uses sodium hydroxide solution spraying for purification, recovering chlorine gas and generating a 10% sodium hypochlorite solution as a byproduct, with the exhaust gas meeting emission standards. Its designed processing capacity is 300 kg / day, and the chlorine recovery rate is 99.99%. Other treatment and recovery equipment can also be used, which is existing technology and will not be described in detail.

[0026] Reference Figure 1 The bottom of the alkali sedimentation tank 19 is integrally formed with an outlet, which is connected to a filter press 22. Calcium and magnesium ions and other high-valence metal ions from the wastewater are precipitated in the strong alkali sedimentation tank and pressed into sludge cakes by the filter press 22 for recycling and storage. The upper outer wall of the alkali sedimentation tank 19 is integrally formed with an upper outlet, which connects to a clear alkali tank 23. The outlet of the clear alkali tank 23 is connected to both the alkali utilization module 24 and the weak alkali tank 17. The supernatant from the alkali sedimentation tank 19 enters the clear alkali tank 23, which is connected to the alkali utilization module 24, realizing the resource-based treatment of the alkali. If the alkalinity of the alkali is insufficient, the alkali from the clear alkali tank 23 returns to the weak alkali tank 17 and re-enters the cathode reaction chamber 2, further increasing the alkalinity.

[0027] During water treatment, clean water is used as makeup water for weak acid and weak alkali solutions. When the acidity of the acid in the strong acid tank 18 reaches the required level, it is discharged into the acid utilization module 20, while clean water is added to the weak acid tank 16. Similarly, when the alkalinity of the alkali in the strong alkali sedimentation tank reaches the required level, it is discharged into the alkali utilization module 24, while clean water is added to the weak alkali tank 17.

[0028] Reference Figure 3 Each three-chamber electrochemical reaction unit has a digital voltmeter 30 electrically connected between the cathode terminal 26 of the cathode rod and the anode terminal 27 of the anode rod, which can monitor the cell voltage of each three-chamber electrochemical reaction unit. In this embodiment, the use of the digital voltmeter 30 is prior art and will not be described in detail.

[0029] Reference Figure 4The anode terminals 27 of the anode rods and the cathode terminals 26 of the cathode rods of multiple three-stage electrochemical reaction units are connected in series and electrically connected to the high-frequency DC power supply 25 through the anode terminal block 29 and the cathode terminal block 28, which can adjust the reaction current of all two-stage electrochemical reaction units.

[0030] The implementation principle of this utility model's three-stage chamber salt and acid / alkali treatment device based on electrochemical reaction is as follows:

[0031] Saline wastewater enters desalination chamber 3. Under the influence of an electric field, cations in the wastewater migrate towards the cathode, generating an alkaline solution in cathode reaction chamber 2. Anions migrate towards the anode, generating an acidic solution in anode reaction chamber 1. The salinity of the wastewater, after the removal of cations and anions, decreases and is discharged from the outlet of desalination chamber 3. Calcium, magnesium, and other high-valence metal cations precipitate in the alkaline solution and are separated from water by a filter press 22. The supernatant alkaline solution can be recycled for wastewater treatment, desulfurization, and pH adjustment. Chlorine gas generated by the electrochemical reaction escapes from the strong acid solution generated in anode reaction chamber 1. This gas is absorbed by sodium hydroxide or ammonia to generate sodium hypochlorite or ammonium chloride. The remaining acid solution is neutralized with ammonia to generate a mixture of ammonium chloride and ammonium sulfate, which is a compound fertilizer. Alternatively, it can be neutralized with lime to generate high-quality gypsum. This process achieves resource recycling while improving water treatment efficiency.

[0032] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A three-stage chamber salt and acid / alkali treatment device based on electrochemical reaction, characterized in that, It includes multiple interconnected three-chamber electrochemical reaction units. Each three-chamber electrochemical reaction unit has three independent chambers separated by an electrolytic membrane. The three independent chambers include an anode reaction chamber (1), a desalination chamber (3), and a cathode reaction chamber (2) arranged in sequence. An anode rod is installed in the anode reaction chamber (1), and a cathode rod is installed in the cathode reaction chamber (2). Water inlets are provided on the lower side walls of the anode reaction chamber (1), the desalination chamber (3), and the cathode reaction chamber (2). Water outlets are provided on the upper side walls of the anode reaction chamber (1), the desalination chamber (3), and the cathode reaction chamber (2). The water inlet of the desalination chamber (3) is used for the entry of saline wastewater, which is then discharged through the water outlet of the desalination chamber (3) after desalination treatment. The water outlet (6) of the anode chamber is connected to a strong acid tank (18), and the water outlet (7) of the cathode chamber is connected to an alkaline sedimentation tank (19).

2. The three-stage salt and acid-base treatment device based on electrochemical reaction according to claim 1, characterized in that: It also includes a weak acid tank (16) and a weak alkali tank (17). The anode chamber inlets (4) of the multiple three-chamber electrochemical reaction units are connected through the anode chamber water inlet manifold (12). The anode chamber water inlet manifold (12) is connected to the weak acid tank (16). The anode chamber outlets (6) of the multiple three-chamber electrochemical reaction units are connected through the anode chamber water outlet manifold (14). The anode chamber water outlet manifold (14) is connected to the strong acid tank (18). The cathode chamber inlets (5) of the multiple three-chamber electrochemical reaction units are connected through the cathode chamber water inlet manifold (13). The cathode chamber water inlet manifold (13) is connected to the weak alkali tank (17). The cathode chamber outlets (7) of the multiple three-chamber electrochemical reaction units are connected through the cathode chamber water outlet manifold (15). The cathode chamber water outlet manifold (15) is connected to the alkali precipitation tank (19).

3. The three-stage salt and acid-base treatment device based on electrochemical reaction according to claim 2, characterized in that: The top of the strong acid tank (18) is connected to a chlorine recovery device (21), and the outlet of the strong acid tank (18) is connected to an acid utilization module (20).

4. The three-stage salt and acid-base treatment device based on electrochemical reaction according to claim 2, characterized in that: The bottom of the alkaline sedimentation tank (19) is provided with an outlet and is connected to a filter press (22). The upper outer wall of the alkaline sedimentation tank (19) is provided with an upper outlet, which is used to connect to the clear alkaline tank (23) for the discharge of the supernatant in the alkaline sedimentation tank (19). The clear alkaline tank (23) is connected to an alkaline utilization module (24).

5. The three-stage salt and acid-base treatment device based on electrochemical reaction according to claim 1, characterized in that: Each of the cathode and anode rods in the three-stage electrochemical reaction unit is electrically connected to a digital voltmeter (30).

6. The three-stage chamber salt and acid / alkali treatment device based on electrochemical reaction according to claim 1, characterized in that: The anode terminals (27) of the anode rods and the cathode terminals (26) of the cathode rods of the multiple three-stage electrochemical reaction units are connected in series and electrically connected to a high-frequency DC power supply (25).

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