Capacitive deionization device for enriching charged substances in water body

Abstract

The utility model provides a capacitive deionization device for enriching charged substances in a water body. The capacitive deionization device structurally comprises a raw water storage device (1), a peristaltic pump (2), a capacitive deionization device (3), a liquid storage device (4) and a direct-current power supply (5), the capacitive deionization device (3) comprises a first electrode (8) and a second electrode (10); the power supply output end of the direct-current power supply (5) is respectively connected with the first electrode (8) and the second electrode (10); the raw water storage device (1) is connected with a water inlet of the capacitive deionization device (3) through a first water pipe (13), the first water pipe (13) is connected with the peristaltic pump (2) in series, and a water outlet of the capacitive deionization device (3) is connected with the liquid storage device (4) through a second water pipe (14); the capacitive deionization device solves the problem that continuous adsorption and enrichment cannot be completed in the same capacitive deionization device in the prior art.

Description

Technical Field

[0001] This utility model relates to a capacitor deionization device for enriching charged substances in water, belonging to the field of pollutant concentration and separation. Background Technology

[0002] Capacitive deionization (CDI) technology, as an emerging water treatment technology, can adsorb charged substances in the solution flowing through the electrode onto the electrode surface under the action of an electric field. When a reverse voltage is applied or a short-circuit discharge is performed, the adsorbed substances flow back into the solution to achieve desorption. Compared with traditional technologies, CDI technology has the advantages of a wide applicable concentration range, high electrode efficiency and easy regeneration, low energy consumption and environmental friendliness, and has significant advantages in water treatment.

[0003] With the progress of urbanization and industrialization, the types of pollutants in water bodies are constantly increasing, posing a great threat to the environment and human safety. To ensure drinking water safety and improve the detection sensitivity of emerging pollutants in water bodies, it is currently necessary to adsorb and enrich some highly dangerous but low-content pollutants in water. For example, nitrosamines are a class of highly carcinogenic compounds. Currently, research on the environmental pollution of nitrosamines and their potential harm to public health is an important topic in the fields of environmental science, public health, and toxicology. Nitrosamines mainly originate from drinking water disinfection, agricultural and industrial production, and food processing, and are usually present in the environment and food at extremely low concentrations. Due to the high carcinogenicity of nitrosamines, even low concentrations can cause harm to the environment and public health. In order to monitor the degree of water pollution, it is necessary to detect whether nitrosamines and other pollutants are present in water bodies. However, since the content of nitrosamines in water bodies is usually low, it is difficult to accurately detect whether nitrosamines and other pollutants are present in water bodies directly. Therefore, it is necessary to enrich nitrosamines and other pollutants in water bodies before detection, so as to realize the detection, supervision, and removal of nitrosamines.

[0004] Currently, the most commonly used enrichment technologies include adsorption, extraction, and membrane separation. However, these methods still have many problems in practical applications. For example, they are effective at high concentrations but have low recovery efficiency at low concentrations, lack selectivity and sensitivity, and are difficult and costly to regenerate materials. Therefore, it is necessary to develop a new type of nitrosamine enrichment device with the goal of improving enrichment efficiency while also reducing costs and being environmentally friendly.

[0005] Currently, capacitive deionization (CDI) technology has been used to adsorb inorganic salinity ions, heavy metal ions, radioactive ions, and some polar organic compounds in water. Therefore, it can also be used to enrich nitrosamines in water. However, existing CDI technology cannot achieve continuous enrichment within the same device during adsorption and enrichment. To address this, this invention focuses on low-concentration pollutants such as nitrosamines in water and designs a capacitive deionization device for enriching charged substances in water from the perspective of high-throughput enrichment and low environmental pollution. Utility Model Content

[0006] This invention provides a capacitive deionization device for enriching charged substances in water, aiming to solve the problem that existing technologies cannot achieve continuous adsorption and enrichment within the same capacitive deionization device.

[0007] The technical solution of this utility model is as follows: a capacitive deionization device for enriching charged substances in water, the structure of which includes a raw water storage device 1, a peristaltic pump 2, a capacitive deionization device 3, a storage device 4, and a DC power supply 5; the capacitive deionization device 3 includes a first electrode 8 and a second electrode 10; the power output terminal of the DC power supply 5 is connected to the first electrode 8 and the second electrode 10 respectively; the raw water storage device 1 is connected to the inlet of the capacitive deionization device 3 through a first water pipe 13, the peristaltic pump 2 is connected in series on the first water pipe 13, and the outlet of the capacitive deionization device 3 is connected to the storage device 4 through a second water pipe 14.

[0008] Furthermore, the capacitor deionization device 3 also includes a first protective plate 6, a first gasket 7, a mesh 9, a second gasket 11, and a second protective plate 12; the first gasket 7, the first electrode 8, the mesh 9, the second electrode 10, and the second gasket 11 are placed between the first protective plate 6 and the second protective plate 12; the first electrode 8 and the second electrode 10 are located on both sides of the mesh 9.

[0009] Furthermore, the first protective plate 6 has a lower hole 6-1, and the second protective plate 12 has an upper hole 12-1; the first protective plate 6 and the second protective plate 12 are parallel to each other, and the position of the upper hole 12-1 is higher than the position of the lower hole 6-1; the height difference between the positions of the upper hole 12-1 and the lower hole 6-1 is greater than the height of the first electrode 8, the partition 9, and the second electrode 10; the lower hole 6-1 is connected to the raw water storage device 1 through the first water pipe 13, and a peristaltic pump 2 is connected in series on the first water pipe 13; the upper hole 12-1 is connected to the storage device 4 through the second water pipe 14.

[0010] Furthermore, the first protective plate 6, the first gasket 7, the first electrode 8, the spacer 9, the second electrode 10, the second gasket 11, and the second protective plate 12 are all placed vertically.

[0011] Furthermore, the first gasket 7 and the second gasket 11 are both rectangular frames of the same shape, and the area of ​​the hollow portion of the rectangular frames of the first gasket 7 and the second gasket 11 is equivalent to the area of ​​the first electrode 8, the spacer 9, and the second electrode 10.

[0012] Furthermore, the right side of the first protective plate 6 is connected to the left side of the first gasket 7, the right side of the first gasket 7 is connected to the left side of the second gasket 11, and the right side of the second gasket 11 is connected to the left side of the second protective plate 12; the hollow portion of the rectangular frame of the first gasket 7 and the second gasket 11 together forms the reaction area, and the first electrode 8, the spacer 9, and the second electrode 10 are precisely embedded in the reaction area. The left side of the first electrode 8 is opposite to the right side of the first protective plate 6, the right side of the first electrode 8 is opposite to the left side of the spacer 9, the right side of the spacer 9 is opposite to the left side of the second electrode 10, and the right side of the second electrode 10 is opposite to the left side of the second protective plate 12.

[0013] Furthermore, the liquid storage device 4 includes an adsorbed water storage device 4-1 and a concentrated liquid storage device 4-2; the second water pipe 14 is connected to the adsorbed water storage device 4-1 through a first collecting water pipe 14-1, and a first valve 15 is connected in series on the first collecting water pipe 14-1; the second water pipe 14 is connected to the concentrated liquid storage device 4-2 through a second collecting water pipe 14-2, and a second valve 16 is connected in series on the second collecting water pipe 14-2.

[0014] Furthermore, both the first protective plate 6 and the second protective plate 12 are made of acrylic material.

[0015] Furthermore, both the first gasket 7 and the second gasket 11 are made of silicone; the mesh 9 is made of non-woven fabric.

[0016] Furthermore, both the first electrode 8 and the second electrode 10 are activated carbon electrodes.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1) This utility model overcomes the problem that the existing technology cannot achieve continuous adsorption and enrichment in the same capacitor deionization device. This utility model can significantly improve the enrichment efficiency of low concentration nitrosamines in water and make up for the defects of long time and low efficiency of other existing traditional enrichment methods.

[0019] 2) The electrode regeneration method of this utility model is simple, requires no extra washing steps, can realize long-term cyclic operation of the equipment, and does not have a negative impact on the environment;

[0020] 3) Compared with other enrichment devices, this utility model has greater potential for large-scale development in the future, meeting the needs of today's new quality productivity development. Attached Figure Description

[0021] AppendixFigure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Appendix Figure 2 This is a schematic diagram of the capacitor deionization device in this utility model.

[0023] In the attached diagram, 1 is the raw water storage device, 2 is the peristaltic pump, 3 is the capacitor deionization device, 4 is the storage device, 4-1 is the post-adsorption water storage device, 4-2 is the concentrated storage device, 5 is the DC power supply, 6 is the first protective plate, 6-1 is the lower orifice, 7 is the first gasket, 8 is the first electrode, 9 is the separator, 10 is the second electrode, 11 is the second gasket, 12 is the second protective plate, 12-1 is the upper orifice, 13 is the first water pipe, 14 is the second water pipe, 14-1 is the first collecting water pipe, 14-2 is the second collecting water pipe, 15 is the first valve, and 16 is the second valve. Detailed Implementation

[0024] A capacitive deionization device for enriching charged substances in water includes a raw water storage device 1, a peristaltic pump 2, a capacitive deionization device 3, a storage device 4, and a DC power supply 5. The capacitive deionization device 3 includes a first electrode 8 and a second electrode 10. The power output terminal of the DC power supply 5 is connected to the first electrode 8 and the second electrode 10 respectively. The raw water storage device 1 is connected to the inlet of the capacitive deionization device 3 through a first water pipe 13, and the peristaltic pump 2 is connected in series on the first water pipe 13. The outlet of the capacitive deionization device 3 is connected to the storage device 4 through a second water pipe 14.

[0025] The capacitor deionization device 3 also includes a first protective plate 6, a first gasket 7, a mesh 9, a second gasket 11, and a second protective plate 12; the first gasket 7, the first electrode 8, the mesh 9, the second electrode 10, and the second gasket 11 are placed between the first protective plate 6 and the second protective plate 12; the first electrode 8 and the second electrode 10 are located on both sides of the mesh 9.

[0026] The first protective plate 6 has a lower hole 6-1, and the second protective plate 12 has an upper hole 12-1; the first protective plate 6 and the second protective plate 12 are parallel to each other, and the upper hole 12-1 is located higher than the lower hole 6-1; the height difference between the upper hole 12-1 and the lower hole 6-1 is preferably greater than the height of the first electrode 8, the partition 9, and the second electrode 10; the lower hole 6-1 is connected to the raw water storage device 1 through the first water pipe 13, and a peristaltic pump 2 is connected in series on the first water pipe 13; the upper hole 12-1 is connected to the storage device 4 through the second water pipe 14; during operation, the upper hole... 12-1 serves as the outlet of the capacitor deionization device 3, and the lower hole 6-1 serves as the inlet of the capacitor deionization device 3. The raw water in the raw water storage device 1 is transported to the capacitor deionization device 3 via the peristaltic pump 2. After passing through the capacitor deionization device 3, the raw water is transported to the storage device 4 via the second water pipe 14 through the upper hole 12-1. During the process of the raw water flowing through the capacitor deionization device 3, the DC power supply 5 applies voltage to the first electrode 8 and the second electrode 10 of the capacitor deionization device 3 to perform adsorption or enrichment operations. The water that has completed adsorption or enrichment flows into the storage device 4 through the upper hole 12-1.

[0027] The first protective plate 6, the first gasket 7, the first electrode 8, the spacer 9, the second electrode 10, the second gasket 11, and the second protective plate 12 are all placed vertically.

[0028] The first gasket 7 and the second gasket 11 are both rectangular frames of the same shape. The area of ​​the hollow part of the rectangular frame of the first gasket 7 and the second gasket 11 is equivalent to the area of ​​the first electrode 8, the mesh 9, and the second electrode 10.

[0029] As attached Figure 2 As shown, the right side of the first protective plate 6 is connected to the left side of the first gasket 7, the right side of the first gasket 7 is connected to the left side of the second gasket 11, and the right side of the second gasket 11 is connected to the left side of the second protective plate 12. The hollow portions of the rectangular frames of the first gasket 7 and the second gasket 11 together form a reaction area. The first electrode 8, the spacer 9, and the second electrode 10 are precisely embedded in the reaction area. The left side of the first electrode 8 is opposite to the right side of the first protective plate 6, the right side of the first electrode 8 is opposite to the left side of the spacer 9, the right side of the spacer 9 is opposite to the left side of the second electrode 10, and the right side of the second electrode 10 is connected to the left side of the second protective plate 12. The left side of plate 12 is opposite to the right side. During operation, a water pipe is connected to the external solution through the first guard plate 6 and the second guard plate 12 respectively. The water pipe connected to the first guard plate 6 is connected to the raw water storage device 1, and the water pipe connected to the second guard plate 12 is connected to the storage device 4. The peristaltic pump 2 is placed between the first guard plate 6 and the raw water storage device 1 to transport raw water. The hollow parts of the same height on the first gasket 7 and the second gasket 11 are connected by the axis to form an internal flow channel, thereby forming a stable passage between the inner and outer sides to ensure that the solution to be treated can flow stably through the first electrode 8, the mesh 9 and the second electrode 10.

[0030] The liquid storage device 4 includes an adsorption water storage device 4-1 and a concentration storage device 4-2; the second water pipe 14 is connected to the adsorption water storage device 4-1 through a first collection water pipe 14-1, and a first valve 15 is connected in series on the first collection water pipe 14-1; the second water pipe 14 is connected to the concentration storage device 4-2 through a second collection water pipe 14-2, and a second valve 16 is connected in series on the second collection water pipe 14-2; the water remaining after the original aqueous solution undergoes ion adsorption flows into the adsorption water storage device 4-1, and the original aqueous solution flows into the concentration storage device 4-2 after enrichment.

[0031] The first protective plate 6 and the second protective plate 12 are both preferably made of acrylic material; the first gasket 7 and the second gasket 11 are both preferably made of silicone material; the mesh 9 is preferably made of non-woven fabric, and the mesh 9 completely separates the first electrode 8 and the second electrode 10 on both sides.

[0032] Both the first electrode 8 and the second electrode 10 are preferably activated carbon electrodes.

[0033] In operation, the first electrode 8 and the second electrode 10 are charged with positive and negative charges respectively by a DC power supply 5. The external aqueous solution to be adsorbed flows into the capacitor deionization device 3 through the lower hole 6-1 of the first protective plate 6 via the first water pipe 13. After passing through the capacitor deionization device 3, the aqueous solution flows out of the capacitor deionization device 3 through the upper hole 12-1 of the second protective plate 12. Since the surfaces of the first electrode 8 and the second electrode 10 are charged with positive and negative charges respectively, when the aqueous solution to be adsorbed flows between the first electrode 8 and the second electrode 10, it causes ions with opposite charges in the aqueous solution to move towards the surface of the first electrode 8 or the second electrode 10, thereby achieving ion adsorption. After adsorption is complete, a reverse voltage is applied to the first electrode 8 and the second electrode 10 by the DC power supply 5 (i.e., if the first electrode 8 is connected to the positive terminal of the DC power supply 5 and the second electrode 10 is connected to the DC power supply 5 during the ion adsorption process). If the negative terminal of power supply 5 is connected to the negative terminal of DC power supply 5 and the positive terminal of DC power supply 5 is connected to the negative terminal of DC power supply 5 during the ion desorption stage, or if short-circuit discharge occurs, the external original aqueous solution continues to flow into the capacitor deionization device 3 through the lower hole 6-1 of the first protective plate 6 via the first water pipe 13. After passing through the capacitor deionization device 3, the original aqueous solution flows out of the capacitor deionization device 3 through the upper hole 12-1 of the second protective plate 12. At this time, the inflowing original aqueous solution acts as the water body to be enriched. Since the polarity of the charge on the surface of the first electrode 8 and the surface of the second electrode 10 has changed compared with ion adsorption, when the water body to be enriched flows between the first electrode 8 and the second electrode 10, the charged objects adsorbed on the surface of the first electrode 8 or the surface of the second electrode 10 during the ion adsorption process are desorbed and enter the water body to be enriched, thereby realizing ion desorption and causing the corresponding charged objects to be enriched in the water body to be enriched.

[0034] When a stable voltage is applied, charged substances (such as nitrosamines) in the low-concentration solution of the raw water storage device 1 complete the adsorption process in a short time. When a reverse voltage or short-circuit discharge is applied, the adsorbed nitrosamines are quickly desorbed into the water to be enriched and flow into the concentration storage device 4-2 to form a high-concentration solution, thereby achieving the enrichment effect. The first electrode 8 and the second electrode 10 complete one adsorption-desorption process. All the charged substances adsorbed on the first electrode 8 and the second electrode 10 are released back into the solution and flow into the concentration storage device 4-2. The first electrode 8 and the second electrode 10 are regenerated, and the next adsorption and enrichment operation can be carried out. The electrode regeneration method of this invention is simple, does not require extra elution steps, can realize long-term cyclic operation of the equipment, and does not have a negative impact on the environment.

[0035] The following examples illustrate the practical application of this utility model. Example 1

[0036] This invention is used to enrich low-concentration nitrosamines in water. During operation, the positive terminal of the DC power supply 5 is connected to the first electrode 8, and the negative terminal is connected to the second electrode 10. An external low-concentration nitrosamine solution flows into the capacitor deionization device 3 through the lower hole 6-1 of the first protective plate 6 via the first water pipe 13. After passing through the capacitor deionization device 3, the solution flows out through the upper hole 12-1 of the second protective plate 12. Since the surfaces of the first electrode 8 and the second electrode 10 are positively and negatively charged respectively, when the low-concentration nitrosamine solution flows between the first electrode 8 and the second electrode 10, the nitrosamines in the solution are concentrated. The amine moves towards the surface of the first electrode 8 or the second electrode 10, thereby achieving the adsorption of nitrosamine ions. At this time, the first valve 15 on the first water collection pipe 14-1 is opened, and the second valve 16 on the second water collection pipe 14-2 is closed. The remaining water after adsorption flows into the water storage device 4-1. After adsorption is completed, a reverse voltage is applied to the first electrode 8 and the second electrode 10 through the DC power supply 5, that is, the first electrode 8 is changed to be connected to the negative terminal of the DC power supply 5, and the second electrode 10 is changed to be connected to the positive terminal of the DC power supply 5. The same low-concentration nitrosamine solution from the outside continues to flow into the capacitor through the lower hole 6-1 of the first protective plate 6 via the first water pipe 13. In the ionization device 3, the original aqueous solution flows out of the capacitor deionization device 3 through the upper hole 12-1 of the second protective plate 12. The low-concentration nitrosamine solution flowing in at this time acts as the water to be enriched. Because the charge polarity of the surfaces of the first electrode 8 and the second electrode 10 has changed compared to the ion adsorption process, when the water to be enriched flows between the first electrode 8 and the second electrode 10, the nitrosamines adsorbed on the surfaces of the first electrode 8 or the second electrode 10 during the ion adsorption process will be repelled by the opposite electric field due to the repulsion of like charges, thus driving them to desorb and enter the water to be enriched. The nitrosamine is enriched in the water body to be enriched; after the nitrosamine is enriched in the water body to be enriched, a high concentration of nitrosamine water body is formed. At this time, the first valve 15 on the first collection water pipe 14-1 is closed, and the second valve 16 on the second collection water pipe 14-2 is opened. The high concentration of nitrosamine water body flows into the concentration storage device 4-2, which facilitates the subsequent detection of the high concentration of nitrosamine water body. This is because if the concentration of nitrosamine in the water is too low and does not reach the detection limit, it is difficult to detect during the experiment and it is impossible to accurately detect whether the water body contains nitrosamine. However, the high concentration of nitrosamine water body formed by the enrichment of the nitrosamine in this utility model improves the accuracy of detecting whether the water body contains nitrosamine.

Claims

1. A capacitor deionization device for enriching charged substances in water, characterized in that: The device includes a raw water storage device (1), a peristaltic pump (2), a capacitor deionization device (3), a storage device (4), and a DC power supply (5). The capacitor deionization device (3) includes a first electrode (8) and a second electrode (10). The power output terminal of the DC power supply (5) is connected to the first electrode (8) and the second electrode (10) respectively. The raw water storage device (1) is connected to the inlet of the capacitor deionization device (3) through a first water pipe (13). The peristaltic pump (2) is connected in series on the first water pipe (13). The outlet of the capacitor deionization device (3) is connected to the storage device (4) through a second water pipe (14).

2. The capacitive deionization device for enriching charged substances in water as described in claim 1, characterized in that: The capacitor deionization device (3) further includes a first protective plate (6), a first gasket (7), a mesh (9), a second gasket (11), and a second protective plate (12); the first gasket (7), the first electrode (8), the mesh (9), the second electrode (10), and the second gasket (11) are placed between the first protective plate (6) and the second protective plate (12); the first electrode (8) and the second electrode (10) are located on both sides of the mesh (9).

3. A capacitive deionization device for enriching charged substances in water as described in claim 2, characterized in that: The first protective plate (6) has a lower hole (6-1), and the second protective plate (12) has an upper hole (12-1); the first protective plate (6) and the second protective plate (12) are parallel to each other, and the position of the upper hole (12-1) is higher than the position of the lower hole (6-1); the height difference between the upper hole (12-1) and the lower hole (6-1) is greater than the height of the first electrode (8), the partition (9), and the second electrode (10); the lower hole (6-1) is connected to the raw water storage device (1) through the first water pipe (13), and a peristaltic pump (2) is connected in series on the first water pipe (13); the upper hole (12-1) is connected to the storage device (4) through the second water pipe (14).

4. A capacitive deionization device for enriching charged substances in water as described in claim 2, characterized in that... The first protective plate (6), the first gasket (7), the first electrode (8), the mesh (9), the second electrode (10), the second gasket (11), and the second protective plate (12) are all placed vertically.

5. A capacitive deionization device for enriching charged substances in water as described in claim 2, characterized in that... The first gasket (7) and the second gasket (11) are both rectangular frames of the same shape. The area of ​​the hollow part of the first gasket (7) and the second gasket (11) is equivalent to the area of ​​the first electrode (8), the mesh (9) and the second electrode (10).

6. A capacitive deionization device for enriching charged substances in water as described in claim 2, characterized in that... The right side of the first protective plate (6) is connected to the left side of the first gasket (7), the right side of the first gasket (7) is connected to the left side of the second gasket (11), and the right side of the second gasket (11) is connected to the left side of the second protective plate (12). The hollow parts of the rectangular frames of the first gasket (7) and the second gasket (11) together form a reaction area. The first electrode (8), the mesh (9), and the second electrode (10) are embedded in the reaction area. The left side of the first electrode (8) is opposite to the right side of the first protective plate (6), the right side of the first electrode (8) is opposite to the left side of the mesh (9), the right side of the mesh (9) is opposite to the left side of the second electrode (10), and the right side of the second electrode (10) is opposite to the left side of the second protective plate (12).

7. A capacitive deionization device for enriching charged substances in water as described in claim 1, characterized in that... The liquid storage device (4) includes an adsorbed water storage device (4-1) and a concentrated liquid storage device (4-2); the second water pipe (14) is connected to the adsorbed water storage device (4-1) through a first collecting water pipe (14-1), and a first valve (15) is connected in series on the first collecting water pipe (14-1); the second water pipe (14) is connected to the concentrated liquid storage device (4-2) through a second collecting water pipe (14-2), and a second valve (16) is connected in series on the second collecting water pipe (14-2).

8. A capacitive deionization device for enriching charged substances in water according to claim 2, characterized in that... Both the first protective plate (6) and the second protective plate (12) are made of acrylic.

9. A capacitive deionization device for enriching charged substances in water according to claim 2, characterized in that: The first gasket (7) and the second gasket (11) are both made of silicone; the mesh (9) is made of non-woven fabric.

10. A capacitive deionization device for enriching charged substances in water according to claim 1, characterized in that... Both the first electrode (8) and the second electrode (10) are activated carbon electrodes.

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