Electrochemical wastewater treatment device

Abstract

The application discloses an electrochemical wastewater treatment device, which comprises a water tank, a power supply, a porous titanium basket electrode, a motor, a rotating shaft, and an electrode connecting device; the porous titanium basket electrode is fixedly installed on the rotating shaft, one end of the rotating shaft provided with the porous titanium basket electrode is arranged in the water tank, and the other end penetrates through a dynamic sealing device arranged on the water tank and is connected with the motor; the electrode connecting device is connected with the water tank through a fixed frame, the electrode connecting device comprises a binding post, a fixing device and an adjusting rod connected with the fixing device, the binding post is connected with the power supply, a carbon brush is arranged on the adjusting rod, and the carbon brush is in contact with the porous titanium basket electrode; the porous titanium basket electrode comprises a titanium metal hollow cylinder and metal particles filled in the hollow cylinder, the application reduces the passivation degree of the electrode, effectively cleans the surface of the electrode, maintains the electrocoagulation reaction at a high efficiency, and realizes the removal rate of heavy metal ions of more than 99.9%.

Description

Technical Field

[0001] This invention relates to a wastewater treatment device, and more specifically, to an electrochemical wastewater treatment device. Background Technology

[0002] Compared to conventional chemical coagulation and sedimentation methods, electrocoagulation technology produces less sludge in wastewater treatment, and exhibits superior settling and dewatering performance of the floc particles. The electrocoagulation process involves multiple processes, including electroflotation, electrocatalytic oxidation, and flocculation, resulting in effective treatment of heavy metal ions, phosphates, and organic matter. Electrocoagulation equipment has a simple, modular structure, allowing for rapid construction and easy installation. It requires no additional chemicals, is easily automated, and can be powered by solar energy even in remote areas. Electrocoagulation can treat heavy metals (chromium, cadmium, mercury, lead, arsenic, copper, zinc, nickel, iron, manganese, and cobalt, etc.), phosphorus, ammonia nitrogen, and other organic pollutants in water, demonstrating significant market potential.

[0003] During electrolysis, the slow diffusion of ions leads to a difference in ion concentration near the electrode surface compared to the bulk solution, causing a shift in electrode potential and resulting in concentration polarization. This anodic polarization triggers electrode metal passivation. Anodic passivation occurs when the metal or compound acting as the anode loses its ability to enter the solution to varying degrees under the influence of current. Experiments show that anodic passivation involves the formation of a dense oxide (or other compound) film on the anode surface. This film covers the metal, isolates the anode from the solution, and hinders further oxidation and dissolution of the metal (but it still maintains conductivity). Over time, this significantly affects electrochemical efficiency, particularly the electrocoagulation effect. Current electrocoagulation technology faces several technical bottlenecks, primarily due to the use of DC power. During electrocoagulation, passivation on the electrodes becomes particularly severe over time, leading to low current efficiency, high energy consumption, and high anode costs. Therefore, designing a suitable electrocoagulation device is crucial to mitigating electrode passivation and polarization and improving electrocoagulation efficiency.

[0004] Invention patent CN115818798B discloses an electrocoagulation wastewater treatment device, including an electrode plate and an electrode control mechanism. A descaling mechanism is connected below the electrode plate, and the electrode control mechanism is located above the electrode plate. The electrode plate of this device has a limited area, making it difficult to expand the scale of wastewater treatment. Furthermore, as electrochemical time progresses, the electrodes gradually wear down into thin sheets, making electrode replacement inconvenient. The descaling mechanism of this device has a complex mechanical design, which is not conducive to later maintenance and repair. Moreover, this descaling mechanism can only perform descaling operations on one set of electrodes, resulting in low operating efficiency. When multiple sets of electrodes are used, electrode passivation easily occurs, leading to a decrease in electrolysis efficiency. The electrode control mechanism of this device is movable, allowing one set of electrode plates to be used as an anode and an adjacent set of electrode plates as a cathode, so that the arrayed electrode plates are used as anodes sequentially from left to right. This configuration method has a complex mechanical design, requires manual control of the electrode control mechanism's movement, and has a low degree of automation. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides an electrochemical wastewater treatment device.

[0006] The technical solution adopted in this invention is:

[0007] An electrochemical wastewater treatment device includes a water tank, a power supply, a porous titanium basket electrode, a motor, a rotating shaft, and an electrode connection device. The porous titanium basket electrode is fixedly mounted on the rotating shaft, with one end of the rotating shaft containing the porous titanium basket electrode placed in the water tank and the other end passing through a dynamic sealing device provided on the water tank and connected to the motor. The electrode connection device is connected to the water tank via a fixed frame and includes a terminal block, a fixing device, and an adjusting rod connected to the fixing device. The terminal block is connected to the power supply, and the adjusting rod is provided with a carbon brush that contacts the porous titanium basket electrode. The porous titanium basket electrode comprises a hollow titanium metal cylinder and metal particles filling the cylinder. The cylinder has small holes with a diameter of 2-5 mm and an internal metal filling rate of 60-90%.

[0008] Furthermore, the metal particles are iron or aluminum particles with a diameter ranging from 10 to 20 mm.

[0009] Furthermore, the porous titanium basket electrodes are arranged in sequence, and adjacent porous titanium basket electrodes are connected to the positive and negative terminals of the power supply respectively through wires, with an adjacent spacing of 10 to 30 mm.

[0010] Furthermore, the fixing device includes a locking device connector and a locking device fixing seat; the locking device fixing seat passes through the fixing frame and is connected to the terminal block; one end of the locking device connector is fixedly connected to the adjusting rod, and the other end is fixedly installed on the locking device fixing seat.

[0011] Furthermore, the fixed frame and the rotating shaft are made of non-conductive material.

[0012] Furthermore, the carbon brush material is electrolytic copper or graphite.

[0013] Furthermore, the adjusting rod and fixing device in the electrode connection device are made of titanium or graphite.

[0014] Furthermore, the hollow cylinder is provided with a material changing window.

[0015] Furthermore, the speed of the motor is 50–200 r / min.

[0016] Furthermore, the power source is one of a DC power source, an AC power source, or a pulsed DC power source.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The porous titanium basket electrode of this invention has a certain proportion of metal particles placed inside it. The porous titanium basket electrode is driven to rotate by a motor, so that the metal particles move and collide with each other continuously inside the porous titanium basket electrode. While achieving electrolytic dissolution, it effectively avoids electrode passivation caused by concentration polarization.

[0019] This invention fills the interior of a porous titanium basket electrode with metal particles, which greatly increases the specific surface area compared to a flat plate electrode, significantly improving wastewater treatment capacity within a limited space and shortening the treatment residence time.

[0020] After using the device of the present invention, when a large amount of electrode material is consumed, the material replacement window of the porous titanium basket electrode can be opened to replace it with new metal particles. There is no need to remove the porous titanium basket electrode from the rotating shaft for installation, making operation convenient and maintenance simple.

[0021] This invention enables alternating changes in the anode and cathode of adjacent titanium basket electrodes through the use of pulse power and alternating current, further reducing the passivation of the electrodes. Through the continuous movement and collision of metal particles within the porous titanium basket electrodes, the electrode surface is effectively cleaned, and the electrocoagulation reaction maintains a high efficiency, achieving a heavy metal ion removal rate of over 99.9%. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an electrochemical wastewater treatment device.

[0023] Figure 2 A schematic diagram of the electrode connection device in an electrochemical wastewater treatment apparatus;

[0024] Figure 3 A side view of a porous titanium basket electrode in an electrochemical wastewater treatment device;

[0025] Figure 4This is a SEM analysis image of flocs from a conventional electrocoagulation treatment device.

[0026] Figure 5 SEM analysis image of flocculants processed by the device of the present invention;

[0027] Figure 6 EDS analysis diagram of flocculants processed by the device of the present invention;

[0028] The components are as follows: 1. Motor; 2. Rotating shaft; 3. Dynamic sealing device; 4. Porous titanium basket electrode; 401. Material changing window; 5. Water tank; 6. Electrode connection device; 601. Fixing device base; 602. Fixing device connector; 603. Adjusting rod; 604. Carbon brush; 7. Terminal block; 8. Power supply; 9. Fixing frame; 10. Water outlet; 11. Water inlet. Detailed Implementation

[0029] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application; however, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise explicitly specified and limited, "on" or "below" a second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0030] Example 1

[0031] Please see Figures 1 to 6 One embodiment provided by the present invention:

[0032] An electrochemical wastewater treatment device includes a water tank 5, a power supply 8, a porous titanium basket electrode 4, a motor 1, a rotating shaft 2, and an electrode connection device 6. The porous titanium basket electrode 4 is fixedly mounted on the rotating shaft 2. One end of the rotating shaft 2 with the porous titanium basket electrode 4 is placed in the water tank 5, and the other end passes through a dynamic sealing device 3 provided on the water tank and is connected to the motor 1. The electrode connection device 6 is connected to the water tank 5 through a fixed frame 9. The electrode connection device 6 includes a terminal 7, a fixing device, and an adjusting rod 603 connected to the fixing device. The terminal 7 is connected to the power supply 8. The adjusting rod 603 is provided with a carbon brush 604, which contacts the porous titanium basket electrode 4. The upper and lower parts of the water tank 5 are respectively provided with an inlet 11 and an outlet 10.

[0033] The porous titanium basket electrodes 4 are arranged in sequence, and adjacent porous titanium basket electrodes 4 are connected to the positive and negative terminals of the power supply 8 respectively through wires. The porous titanium basket electrode 4 includes a hollow titanium metal cylinder and metal particles filled inside the cylinder. The cylinder has a diameter of 300 mm and a height of 40 mm. The surface of the cylinder is uniformly covered with 3 mm small holes. The distance between two pairs of porous titanium basket electrodes 4 is 30 mm. The metal particles are iron balls, and 10 mm and 20 mm iron balls are filled in a 1:1 ratio.

[0034] In this embodiment, the internal metal filling rate is 85%, and the motor rotation speed is 100 rpm. Under the electric field generated by the titanium basket electrode, the filled metal particles are connected in series. The group of filled metal particles is like countless electrodes undergoing an electrolytic reaction. The filling rate of metal particles has a significant impact on electrochemical wastewater treatment. If the filling rate is less than 60%, the metal particles move too fast, which will lead to a decrease in the particle current and the voltage across the terminals under the same conditions, thus affecting the electrolysis efficiency. If the filling rate is greater than 90%, the relative movement of the metal particles is smaller, and the removal of the passivation layer on the electrode surface is weaker, thus affecting the reaction efficiency. The size and gradation of the metal particles have a significant impact on the electrolysis efficiency. In addition, the rotation speed of the porous titanium basket electrode driven by the electrode affects the movement speed of the metal particles. A slower rotation speed is not conducive to the renewal of the particle electrode surface, while a faster rotation speed will cause additional energy consumption, which will also have a certain adverse effect on the electrolysis efficiency.

[0035] like Figure 2 As shown, the fixing device includes a clamping device connector 602 and a clamping device fixing base 601; the clamping device fixing base 601 passes through the fixing frame 9 and is connected to the terminal 7; one end of the clamping device connector 602 is fixedly connected to the adjusting rod 603, and the other end is fixedly installed on the clamping device fixing base 601. The electrode connecting device 6 is in close contact with the surface of the porous titanium basket electrode 4 through the carbon brush 604 on the adjusting rod 603, which can ensure that the carbon brush 604 keeps in contact with the porous titanium basket electrode 4 during the rotation of the disc electrode to provide current.

[0036] The fixed frame 9 and the rotating shaft 2 are made of non-conductive material, the carbon brush 604 is made of graphite, and the adjusting rod 603 and the fixing device in the electrode connection device 6 are made of graphite.

[0037] This device was used to treat wastewater with an initial chromium (VI) concentration of 100 g·m³. －3 The wastewater containing chromium heavy metals was treated. Before treatment, the pH was adjusted to 4, the temperature was set to 25℃, and three parallel experiments were conducted. The power supply used was a pulse power supply with a voltage control of 4V, a frequency of 1000Hz, and a space ratio of 20%. Each treatment lasted for 5 minutes. The chromium content of the effluent is shown in Table 1.

[0038] Table 1. Test results of chromium removal rate before and after wastewater treatment by this device.

[0039]

[0040]

[0041] like Figure 4 As shown, the flocs produced by conventional electrocoagulation devices have a dense, plate-like surface with no obvious porous structure, resulting in poor dispersibility and hindering the adsorption of heavy metal ions from water; for example... Figure 5 and Figure 6 As shown, the surface morphology (×5000) of the flocs produced by this device is a rough and porous spherical shape with an uneven surface and a large contact area, which is conducive to the adsorption of metal ions.

[0042] Example 2

[0043] Please see Figures 1 to 6 One embodiment provided by the present invention:

[0044] An electrochemical wastewater treatment device includes a water tank 5, a power supply 8, a porous titanium basket electrode 4, a motor 1, a rotating shaft 2, and an electrode connection device 6. The porous titanium basket electrode 4 is fixedly mounted on the rotating shaft 2. One end of the rotating shaft 2 with the porous titanium basket electrode 4 is placed in the water tank 5, and the other end passes through a dynamic sealing device 3 provided on the water tank and is connected to the motor 1. The electrode connection device 6 is connected to the water tank 5 through a fixed frame 9. The electrode connection device 6 includes a terminal 7, a fixing device, and an adjusting rod 603 connected to the fixing device. The terminal 7 is connected to the power supply 8. The adjusting rod 603 is provided with a carbon brush 604, which contacts the porous titanium basket electrode 4. The upper and lower parts of the water tank 5 are respectively provided with an inlet 11 and an outlet 10.

[0045] The porous titanium basket electrodes 4 are arranged in sequence, and adjacent porous titanium basket electrodes 4 are connected to the positive and negative terminals of the power supply 8 through wires respectively. The power supply 8 is a DC power supply. The porous titanium basket electrode 4 includes a hollow titanium metal cylinder and metal particles filled inside the cylinder. The cylinder has a diameter of 300 mm and a height of 40 mm. The surface of the cylinder is uniformly covered with 2 mm small holes. The distance between two pairs of porous titanium basket electrodes 4 is 10 mm. The metal particles are 10 mm aluminum spheres.

[0046] In this embodiment, the internal metal filling rate is 60%, and the motor rotation speed is 50 rpm.

[0047] Furthermore, the hollow cylinder of the porous titanium basket electrode 4 is provided with a material replacement window 401. The material replacement window 401 is set on the outer periphery of the hollow cylinder through a hinge structure. When a large amount of aluminum electrode material is consumed, the material replacement window 401 is opened to replace the aluminum ball. This setting does not require the porous titanium basket electrode 4 to be removed from the rotating shaft for installation, making operation convenient and maintenance simple.

[0048] like Figure 2 As shown, the fixing device includes a clamping device connector 602 and a clamping device fixing base 601; the clamping device fixing base 601 passes through the fixing frame 9 and is connected to the terminal 7; one end of the clamping device connector 602 is fixedly connected to the adjusting rod 603, and the other end is fixedly installed on the clamping device fixing base 601. The electrode connecting device 6 is in close contact with the surface of the porous titanium basket electrode 4 through the carbon brush 604 on the adjusting rod 603, which can ensure that the carbon brush 604 keeps in contact with the porous titanium basket electrode 4 during the rotation of the disc electrode to provide current.

[0049] The fixed frame 9 and the rotating shaft 2 are made of non-conductive material, the carbon brush 604 is made of electrolytic copper, and the adjusting rod 603 and the fixing device in the electrode connection device 6 are made of titanium.

[0050] Example 3

[0051] Please see Figures 1 to 6 One embodiment provided by the present invention:

[0052] An electrochemical wastewater treatment device includes a water tank 5, a power supply 8, a porous titanium basket electrode 4, a motor 1, a rotating shaft 2, and an electrode connection device 6. The porous titanium basket electrode 4 is fixedly mounted on the rotating shaft 2. One end of the rotating shaft 2 with the porous titanium basket electrode 4 is placed in the water tank 5, and the other end passes through a dynamic sealing device 3 provided on the water tank and is connected to the motor 1. The electrode connection device 6 is connected to the water tank 5 through a fixed frame 9. The electrode connection device 6 includes a terminal 7, a fixing device, and an adjusting rod 603 connected to the fixing device. The terminal 7 is connected to the power supply 8. The adjusting rod 603 is provided with a carbon brush 604, which contacts the porous titanium basket electrode 4. The upper and lower parts of the water tank 5 are respectively provided with an inlet 11 and an outlet 10.

[0053] The porous titanium basket electrodes 4 are arranged in sequence, and adjacent porous titanium basket electrodes 4 are connected to the positive and negative terminals of the power supply 8 respectively through wires. The porous titanium basket electrode 4 includes a hollow titanium metal cylinder and metal particles filled inside the cylinder. The cylinder has a diameter of 300 mm and a height of 40 mm. The surface of the cylinder is uniformly covered with 5 mm small holes. The distance between two pairs of porous titanium basket electrodes 4 is 20 mm. The metal particles are 15 mm aluminum spheres.

[0054] In this embodiment, the internal metal filling rate is 90%, and the motor rotation speed is 200 rpm.

[0055] Furthermore, the power supply 8 is an AC power supply, which enables the periodic switching of the anode and cathode, effectively preventing electrode passivation, and resulting in lower power consumption and cost.

[0056] like Figure 2 As shown, the fixing device includes a clamping device connector 602 and a clamping device fixing base 601; the clamping device fixing base 601 passes through the fixing frame 9 and is connected to the terminal 7; one end of the clamping device connector 602 is fixedly connected to the adjusting rod 603, and the other end is fixedly installed on the clamping device fixing base 601. The electrode connecting device 6 is in close contact with the surface of the porous titanium basket electrode 4 through the carbon brush 604 on the adjusting rod 603, which can ensure that the carbon brush 604 keeps in contact with the porous titanium basket electrode 4 during the rotation of the disc electrode to provide current.

[0057] The fixed frame 9 and the rotating shaft 2 are made of non-conductive material, the carbon brush 604 is made of electrolytic copper, and the adjusting rod 603 and the fixing device in the electrode connection device 6 are made of titanium.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An electrochemical wastewater treatment device, characterized in that: The device includes a water tank, a power supply, a porous titanium basket electrode, a motor, a rotating shaft, and an electrode connection device. The porous titanium basket electrode is fixedly mounted on the rotating shaft, with one end of the rotating shaft containing the porous titanium basket electrode placed in the water tank and the other end passing through a dynamic sealing device on the water tank and connected to the motor. The electrode connection device is connected to the water tank via a fixed frame and includes a terminal block, a fixing device, and an adjusting rod connected to the fixing device. The terminal block is connected to the power supply, and the adjusting rod is equipped with a carbon brush that contacts the porous titanium basket electrode. The fixed frame and the rotating shaft are made of non-conductive material. The porous titanium basket electrode comprises a hollow titanium cylinder and metal particles filling the cylinder. The cylinder has small holes with a diameter of 2-5 mm and an internal metal filling rate of 60-90%. The metal particles are iron or aluminum particles with a diameter range of 10-20 mm. The power supply is one of a DC power supply, an AC power supply, or a pulsed DC power supply.

2. The electrochemical wastewater treatment device according to claim 1, characterized in that: The porous titanium basket electrodes are arranged in sequence, and adjacent porous titanium basket electrodes are connected to the positive and negative terminals of the power supply respectively through wires, with an adjacent spacing of 10~30mm.

3. The electrochemical wastewater treatment device according to claim 1, characterized in that: The fixing device includes a locking device connector and a locking device fixing seat; the locking device fixing seat passes through the fixing frame and is connected to the terminal block; one end of the locking device connector is fixedly connected to the adjusting rod, and the other end is fixedly installed on the locking device fixing seat.

4. The electrochemical wastewater treatment device according to claim 1, characterized in that: The carbon brush is made of electrolytic copper or graphite.

5. The electrochemical wastewater treatment device according to claim 1, characterized in that: The adjusting rod and fixing device in the electrode connection device are made of titanium or graphite.

6. The electrochemical wastewater treatment device according to claim 1, characterized in that: The hollow cylinder is equipped with a material changing window.

7. The electrochemical wastewater treatment device according to claim 1, characterized in that: The motor has a rotational speed of 50~200 r / min.

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