Flowing capacitive deionization device for treating copper-containing wastewater

Abstract

The utility model relates to the technical field of purification devices, and discloses a flowing capacitive deionizing device for treating copper-containing wastewater, which comprises a silica gel sheet, ion exchange membranes, plastic plates, titanium plates and organic glass plates, the ion exchange membranes, the plastic plates, the titanium plates and the organic glass plates are arranged in pairs along two sides of the silica gel sheet, the silica gel sheet is provided with a treatment channel, and the plastic plates are provided with snakelike galleries. The two ends of the treatment channel penetrate through the ion exchange membrane, the plastic plate, the titanium plate and the organic glass plate and form a first inlet and a first outlet in the organic glass plate; the two ends of the snake-shaped corridor penetrate through the titanium plate and the organic glass plate and form a second inlet and a second outlet in the organic glass plate. Compared with the prior art, the copper-containing wastewater is filtered by arranging the snakelike corridor and utilizing the flowing electrode slurry, so that the negative influence that copper ions form sediments under high potential and block a flowing electrode channel is avoided, and the negative influence that an electrode is not fully contacted with the wastewater due to unsmooth flowing of the electrode slurry is eliminated; and the device can stably and efficiently treat copper ions in wastewater.

Description

Technical Field

[0001] The utility model relates to the technical field of purification devices, in particular to a flow-through capacitive deionization device for treating copper-containing wastewater. Background Art

[0002] With the development of industrial technology, more and more heavy metal-containing wastewater is directly or indirectly discharged into the environment, which has a great impact on the ecological environment. As an important industrial raw material, copper often exists in the wastewater discharged from industries such as mine metallurgy, metal electroplating, and printed circuit board manufacturing. Excessive discharge of copper into rivers will affect the vital activities of fish, cause lesions in tissues such as fish gills, and may even directly lead to the death of fish. For humans, excessive exposure to copper has been proven to cause serious mental diseases such as Alzheimer's disease and Parkinson's disease, and may also lead to acute organ failure. Therefore, it is of great significance to treat and recover copper ions from wastewater.

[0003] In recent years, the treatment of heavy metal wastewater by capacitive deionization (CDI) technology has shown great application potential. Especially the flow-through capacitive deionization technology (FCDI), its unique advantages such as high efficiency, low energy consumption, strong recyclability, and stable continuous operation have made it stand out among traditional processes such as chemical precipitation, adsorption, and membrane methods. However, according to existing research, it still has the following technical problems: a higher potential has a stronger electrostatic force and a higher treatment effect, but due to the lower reduction potential of copper ions, copper oxide, cuprous oxide, and metallic copper and other deposits are easily formed under high voltage, thus blocking the flow electrode channels in traditional integrated graphite electrodes and reducing the treatment efficiency of the FCDI system. Therefore, it is necessary to improve the flow electrode channels for copper ions to enable it to continuously and stably and efficiently treat copper ions. Summary of the Utility Model

[0004] To solve the above technical problems, the purpose of the utility model is to provide a flow-through capacitive deionization device for treating copper-containing wastewater, which has the characteristics of continuously and efficiently treating copper ions.

[0005] Based on this, the utility model provides a flow-through capacitive deionization device for treating copper-containing wastewater, including:

[0006] A silica gel sheet, which is provided with a treatment channel for the flow of copper-containing wastewater;

[0007] Ion exchange membranes, which are paired and attached to both sides of the silica gel sheet and are closely attached to the silica gel sheet;

[0008] Plastic plates, which are paired and arranged on both sides of the silica gel sheet and are closely attached to the ion exchange membranes, and the plastic plates are provided with serpentine channels for the flow of electrode slurry;

[0009] Titanium plates, arranged in pairs on both sides of the silica gel sheet and closely attached to the plastic plate;

[0010] Plexiglass plates, arranged in pairs on both sides of the silica gel sheet and closely attached to the titanium plates;

[0011] Among them, both ends of the treatment channel pass through the ion exchange membrane, the plastic plate, the titanium plates and the Plexiglass plates and form a first inlet and a first outlet on the Plexiglass plate, and both ends of the serpentine corridor pass through the titanium plates and the Plexiglass plates and form a second inlet and a second outlet on the Plexiglass plate.

[0012] In some embodiments of the present application, it includes:

[0013] A first liquid inlet pipe, passing through the first inlet to communicate with the treatment channel;

[0014] A first liquid outlet pipe, passing through the first outlet to communicate with the treatment channel;

[0015] A second liquid inlet pipe, passing through the second inlet to communicate with the serpentine corridor;

[0016] A second liquid outlet pipe, passing through the second outlet to communicate with the serpentine corridor.

[0017] In some embodiments of the present application, the area of the treatment channel is larger than the area of the serpentine corridor.

[0018] In some embodiments of the present application, the concentration of copper ions in the copper-containing wastewater in the treatment channel is 10 - 200 mg / L.

[0019] In some embodiments of the present application, the length of the titanium plate is 9 cm, the width is 4 cm, and the thickness is 1 mm.

[0020] In some embodiments of the present application, the length of the treatment channel is 4 cm, the width is 4 cm, and the height is 1 mm.

[0021] The embodiment of the present utility model provides a flow-through capacitive deionization device for treating copper-containing wastewater. Compared with the prior art, its beneficial effects are as follows:

[0022] This application uses a plastic plate with a serpentine corridor as a flow electrode channel for a copper ion FCDI system, avoiding the negative impact of copper ions forming deposits at high potentials and blocking the flow electrode channel, eliminating the negative impact of poor flow of the electrode slurry resulting in insufficient contact between the electrode and the wastewater, and enabling the device to stably and efficiently treat copper ions in wastewater. By using the negatively charged electrode particles in the flow electrode, copper ions are attracted to pass through the cation exchange membrane into the electrode solution and form an electric double layer on the electrode surface to be captured. At the same time, by increasing the input potential and using efficient electrode materials, the treatment efficiency of copper-containing wastewater is further improved. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a flow-through capacitive deionization device for treating copper-containing wastewater in some embodiments of this application;

[0024] Figure 2 It is a front view of the plastic plate provided by an embodiment of the present utility model;

[0025] Figure 3 It is a front view of the silica gel sheet provided by an embodiment of the present utility model.

[0026] In the figure, 1 is a silica gel sheet; 11 is a treatment channel; 2 is an ion exchange membrane; 3 is a plastic plate; 31 is a serpentine corridor; 4 is a titanium plate; 5 is a plexiglass plate; 6 is a first inlet pipe; 7 is a first outlet pipe; 8 is a second inlet pipe; 9 is a second outlet pipe. Detailed Embodiments

[0027] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0028] It should be understood that in the present utility model, terms such as "front" and "rear" are used to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, "front" information can also be referred to as "rear" information, and "rear" information can also be referred to as "front" information.

[0029] As Figures 1 to 3As shown in the figure, the present utility model provides a flow-through capacitive deionization device for treating copper-containing wastewater, which includes a silica gel sheet 1, an ion exchange membrane 2, a plastic plate 3, a titanium plate 4, and an organic glass plate 5 arranged in sequence from the inside to the outside. The silica gel sheet 1 is provided with a treatment channel 11 for the flow of copper-containing wastewater. The ion exchange membranes 2 are arranged in pairs on both sides of the silica gel sheet 1 and are closely attached to the silica gel sheet 1. The plastic plates 3 are arranged in pairs on both sides of the silica gel sheet 1 and are closely attached to the ion exchange membranes 2. The plastic plate 3 is provided with a serpentine corridor 31 for the flow of electrode slurry. The titanium plates 4 are arranged in pairs on both sides of the silica gel sheet 1 and are closely attached to the plastic plates 3. The organic glass plates 5 are arranged in pairs on both sides of the silica gel sheet 1 and are closely attached to the titanium plates 4. Further, both ends of the treatment channel 11 pass through the ion exchange membrane 2, the plastic plate 3, the titanium plate 4, and the organic glass plate 5 and form a first inlet and a first outlet on the organic glass plate 5. The first inlet is provided with a first liquid inlet pipe 6, and the first outlet is provided with a first liquid outlet pipe 7. Similar to the treatment channel 11, both ends of the serpentine corridor 31 pass through the titanium plate 4 and the organic glass plate 5 and form a second inlet and a second outlet on the organic glass plate 5. The second inlet is provided with a second liquid inlet pipe 8, and the second outlet is provided with a second liquid outlet pipe 9.

[0030] Based on the above structure, before use, the device is assembled in the order of the organic glass plate 5, the titanium plate 4, the plastic plate 3, the ion exchange membrane 2, the silica gel sheet 1, the ion exchange membrane 2, the plastic plate 3, the titanium plate 4, and the organic glass plate 5, and the device is fixed using screws and nuts. Subsequently, a silica gel tube for transporting copper-containing wastewater is connected to the first inlet and the first outlet, and a silica gel tube for transporting the flow-through electrode slurry is connected to the second outlet and the second outlet; the positive and negative electrodes of the external power supply are connected to the power supply interfaces of the titanium plate 4 to provide an external voltage for the device. During use, the flow-through electrode slurry is continuously pumped from the second inlet into the serpentine corridor 31 in the plastic plate 3 by a peristaltic pump. During the flow of the flow-through electrode slurry in the serpentine corridor 31, copper ions are captured and leave the device through the second outlet; further, the copper-containing wastewater is continuously pumped from the water inlet into the copper-containing wastewater channel by a peristaltic pump. During the movement of the copper-containing wastewater in the treatment channel 11, the copper ions are attracted by the electrostatic force and pass through the cation exchange membrane 2 into the flow-through electrode slurry to achieve the separation of copper ions and water. The treated wastewater then leaves the device through the first outlet, successfully realizing the continuous removal process of copper ions in the wastewater.

[0031] Optionally, in some embodiments of the present application, the length of the titanium plate 4 is preferably 9 cm, the width is preferably 4 cm, and the thickness is preferably 1 mm. At the same time, an electrode interface with a length and width of 1 cm is provided at the top of the titanium plate 4 for connecting an external DC power supply; the titanium plates 4 on both sides of the silica gel sheet 1 are divided into a cathode part and an anode part according to the positive and negative of the input potential.

[0032] Further, in some embodiments of the present application, the volume of the serpentine channel 31 can be adjusted according to the water treatment volume during actual application. Specifically, in the embodiments of the present utility model, the length of the serpentine channel 31 is preferably 4 cm, the width is preferably 4 cm, and the thickness is preferably 2 cm. Based on the above dimensions, the flowing electrode slurry can enter the serpentine channel 31 from the second inlet pipe 8 connected to the serpentine channel 31 during the wastewater treatment process, and adsorb the ions with opposite charges passing through the ion exchange membrane 2 during the flowing process. Subsequently, it leaves the device through the second outlet pipe 9 to reduce the copper ion concentration in the wastewater.

[0033] Furthermore, similar to the size adjustment of the serpentine channel 31, the volume of the treatment channel 11 of the present application can also be adjusted according to the actual water volume and water flow rate. Specifically, in the embodiments of the present utility model, the treatment channel 11 is preferably a cuboid with a length of 4 cm, a width of 4 cm, and a height of 1 mm; the bottom of the treatment channel 11 is connected to the first inlet pipe 6 to introduce copper-containing wastewater, and the treated wastewater flows out of the treatment channel 11 through the first outlet pipe 7.

[0034] In fact, for the ion exchange membrane 2 of the present application, it can be specifically divided into a cation exchange membrane 2 or an anion exchange membrane 2 according to the charging situation of the titanium plate 4 connected thereto. Specifically, in the specific embodiments of the present utility model, the cation exchange membrane 2 can allow copper ions in the copper-containing wastewater to pass through.

[0035] In addition, in some embodiments of the present application, the copper ion concentration in the copper-containing wastewater is preferably 10 - 200 mg / L; the high-concentration copper-containing wastewater preferably enters the copper-containing wastewater channel from the first inlet pipe 6 in a continuous flow manner.

[0036] The flowing capacitive deionization device provided by the present utility model includes a flowing electrode slurry. The flowing electrode slurry is prepared by an active material, conductive carbon black, and a sodium chloride solution; the active material should have characteristics such as a large specific surface area, strong conductivity, high hydrophilicity, and low cost. In the specific embodiments of the present utility model, the active material is preferably commercial activated carbon. The commercial activated carbon with a large specific surface area can generate a larger electric double layer, providing more sufficient adsorption sites for copper ions, thereby improving the treatment efficiency of copper-containing wastewater. The activated carbon material with strong conductivity can reduce the resistance of electron transfer, generate a larger electrostatic attraction, and improve the adsorption ability of copper ions; the conductive carbon black is used to improve the conductivity of the flowing electrode slurry; the sodium chloride solution is used to reduce the internal resistance of the flowing electrode and improve the ion diffusion performance.

[0037] Specifically, in the first embodiment of the present application, copper-containing wastewater (pH: 8.0, copper ion concentration: 200 mg / L, flow rate: 0.5 mL / min) enters the cavity of the wastewater channel from the water inlet, and the flow electrode (flow rate: 10 mL / min) enters the serpentine corridor 31 of the plastic plate 3 from the electrode liquid inlet. After continuously operating for 60 min under an applied voltage of 2.4 V, the copper-containing wastewater outlet is taken and the copper ion concentration is measured. Under the above conditions, the copper ion removal rate is 65.3%.

[0038] Furthermore, in the second embodiment of the present application, the voltage is increased to 4.8 V to increase the electrostatic attraction force, and other conditions are the same as those in the first embodiment. Under the above conditions, the copper ion removal rate is 85.7%.

[0039] Even further, on the basis of the first embodiment, the pH of the incoming copper-containing wastewater is adjusted to 2.5 to reduce the solution ohmic resistance, and other conditions are the same. Under the above conditions, the copper ion removal rate is 95.1%.

[0040] In summary, the present utility model provides a flow-through capacitive deionization device for treating copper-containing wastewater, which includes a silica gel sheet 1 and ion exchange membranes 2, plastic plates 3, titanium plates 4, and plexiglass plates 5 arranged in pairs on both sides of the silica gel sheet 1. The silica gel sheet 1 is provided with a treatment channel 11, and the plastic plate 3 is provided with a serpentine corridor 31. Both ends of the treatment channel 11 pass through the ion exchange membrane 2, plastic plate 3, titanium plate 4, and plexiglass plate 5 and form a first inlet and a first outlet on the plexiglass plate 5. Both ends of the serpentine corridor 31 pass through the titanium plate 4 and plexiglass plate 5 and form a second inlet and a second outlet on the plexiglass plate 5. Compared with the prior art, the present application filters the copper-containing wastewater by arranging the serpentine corridor 31 and using the flow electrode slurry, avoiding the negative impact of copper ions forming deposits at high potentials and blocking the flow electrode channel, and eliminating the negative impact of poor flow of the electrode slurry resulting in insufficient contact between the electrode and the wastewater, enabling the device to stably and efficiently treat copper ions in the wastewater.

[0041] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A flow-through capacitive deionization device for treating copper-containing wastewater, characterized in that, Comprising: A silicone sheet, which is provided with a treatment channel for the flow of copper-containing wastewater. Ion exchange membranes, which are paired and attached to both sides of the silicone sheet and are closely attached to the silicone sheet. Plastic plates, which are paired and arranged on both sides of the silicone sheet and are closely attached to the ion exchange membranes. The plastic plates are provided with serpentine corridors for the flow of electrode slurry. Titanium plates, which are paired and arranged on both sides of the silicone sheet and are closely attached to the plastic plates. Acrylic glass plates, which are paired and arranged on both sides of the silicone sheet and are closely attached to the titanium plates. Wherein, both ends of the treatment channel pass through the ion exchange membranes, the plastic plates, the titanium plates and the acrylic glass plates and form a first inlet and a first outlet on the acrylic glass plate. Both ends of the serpentine corridor pass through the titanium plates and the acrylic glass plates and form a second inlet and a second outlet on the acrylic glass plate.

2. The flow-through capacitive deionization device for treating copper-containing wastewater according to claim 1, wherein Further comprising: A first liquid inlet pipe, which is inserted into the first inlet to communicate with the treatment channel. A first liquid outlet pipe, which is inserted into the first outlet to communicate with the treatment channel. A second liquid inlet pipe, which is inserted into the second inlet to communicate with the serpentine corridor. A second liquid outlet pipe, which is inserted into the second outlet to communicate with the serpentine corridor.

3. The flow-through capacitive deionization device for treating copper-containing wastewater according to claim 1, wherein The area of the treatment channel is larger than the area of the serpentine corridor.

4. The flow-through capacitive deionization device for treating copper-containing wastewater according to claim 1, wherein The copper ion concentration of the copper-containing wastewater in the treatment channel is 10 - 200 mg / L.

5. The flow-through capacitive deionization device for treating copper-containing wastewater according to claim 1, characterized in that, The length of the titanium plate is 9 cm, the width is 4 cm, and the thickness is 1 mm.

6. The flow-through capacitive deionization device for treating copper-containing wastewater according to claim 1, wherein, The length of the treatment channel is 4 cm, the width is 4 cm, and the height is 1 mm.

Images