Battery wastewater recovery processing system and method

Abstract

The application discloses a battery wastewater recycling treatment system and method, which comprises an electrolytic flotation device, a first pump and a BDD electro-catalytic oxidation reactor. The electrolytic flotation device is provided with a first liquid inlet and a first liquid outlet, and a first flow channel is formed between the first liquid inlet and the first liquid outlet. The first flow channel is a bending flow channel. The electrolytic flotation device is used for performing electrochemical reaction on the battery wastewater in the first flow channel, so that the emulsified oil, colloidal oil and part of the soluble oil in the battery wastewater are converted into insoluble oil droplets, and water is electrolyzed to generate gas. The first pump is connected to the first liquid inlet. The BDD electro-catalytic oxidation reactor is provided with a second liquid inlet and a second liquid outlet. The second liquid inlet is communicated with the first liquid outlet. A second flow channel is formed between the second liquid inlet and the second liquid outlet. The battery wastewater recycling treatment system and method can improve the oil removal efficiency, make the oil removal simpler and more convenient, reduce the operation cost and the difficulty of control and management.

Description

Technical Field

[0001] This invention relates to the field of battery recycling technology, and in particular to a battery wastewater recycling and treatment system and method. Background Technology

[0002] Battery wastewater contains various oils, among which emulsified oil and soluble oil are particularly difficult to remove. Failure to treat them promptly will affect subsequent recycling processes. Related technologies generally employ resin adsorption for oil removal. While resin can remove some emulsified and soluble oils, its removal efficiency is low, especially for soluble oils. Furthermore, the resin requires regeneration with ethanol, which needs to be distilled for reuse, resulting in a highly complex process, high operating costs, and significant challenges in control and management. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery wastewater recycling and treatment system that not only improves oil removal efficiency and makes oil removal simpler and more convenient, but also effectively removes soluble oil from wastewater. Furthermore, it has lower operating costs and is easier to operate and manage.

[0004] The present invention also proposes a recycling method based on the above-mentioned battery wastewater recycling and treatment system.

[0005] According to a first aspect of the present invention, a battery wastewater recycling and treatment system includes an electrolytic flotation device, a first pump, and a BDD electrocatalytic oxidation reactor. The electrolytic flotation device is provided with a first inlet and a first outlet, and a first flow channel is formed between the first inlet and the first outlet. The first flow channel is a tortuous flow channel. The electrolytic flotation device is used to perform an electrochemical reaction on the battery wastewater mixed with an activator in the first flow channel, so that the emulsified oil, colloidal oil, and some soluble oil in the battery wastewater are converted into insoluble oil droplets, and some soluble oil is removed by electrocatalytic oxidation. Simultaneously, electrolysis... Water generates gas. The first pump is connected to the first inlet so that the flow rate of the battery wastewater flowing through the first flow channel is within a preset range that allows the gas to form micro-nano bubbles. The micro-nano bubbles are used to remove the insoluble oil droplets by flotation. The BDD electrocatalytic oxidation reactor is provided with a second inlet and a second outlet. The second inlet is connected to the first outlet, and a second flow channel is formed between the second inlet and the second outlet. The BDD electrocatalytic oxidation reactor is used to electrocatalytically oxidize and remove the remaining soluble oil in the battery wastewater in the second flow channel.

[0006] The battery wastewater recycling and treatment system according to embodiments of the present invention has at least the following beneficial effects:

[0007] When it is necessary to remove emulsified oil, colloidal oil, and soluble oil from battery wastewater, a high-charge-density activator is added to the wastewater and pumped into the first channel of the electrolytic flotation device by a first pump. The electrolytic flotation device performs an electrochemical reaction on the battery wastewater in the first channel, converting the emulsified oil, colloidal oil, and some soluble oil in the wastewater into insoluble oil droplets. It also removes some of the soluble oil in the wastewater through electrocatalytic oxidation. Simultaneously, the electrolysis of the battery wastewater produces hydrogen, oxygen, and other gases, which are then propelled by the first pump through the second channel. The flow rate of the battery wastewater in the first channel is within a preset range. When the battery wastewater flows within the narrow and tortuous first channel within this flow rate range, it can cause gases such as hydrogen and oxygen to form micro-nano bubbles. Insoluble oil droplets will then attach to the micro-nano bubbles and float to the surface with them to form floating oil. After the floating oil is removed, the battery wastewater after the floating oil is removed is fed into the BDD electrocatalytic oxidation reactor. The BDD electrocatalytic oxidation reactor has a large electrode potential, which can electrocatalytically oxidize the remaining soluble oil in the battery wastewater to remove the remaining soluble oil. According to an embodiment of the battery wastewater recycling and treatment system of the present invention, the first flow channel of the electrolytic flotation device is configured as a narrow, tortuous flow channel. By using a first pump to keep the flow velocity of the battery wastewater in the first flow channel within a preset range, it is possible to easily form micro-nano bubbles. The electrolytic flotation device performs electrochemical reactions on emulsified oil, colloidal oil, and some soluble oil, and the resulting insoluble oil droplets can be adsorbed onto the micro-nano bubbles to form easily removable floating oil. Furthermore, the electrolytic flotation device can electrocatalytically oxidize and remove some of the soluble oil in the battery wastewater. Finally, the remaining soluble oil can be removed by electrocatalytic oxidation using a BDD electrocatalytic oxidation reactor with a large electrode potential. This system not only has high oil removal efficiency and is simpler and more convenient to use, but also effectively removes soluble oil from battery wastewater. In addition, it has lower operating costs and is easier to operate and manage.

[0008] According to some embodiments of the present invention, the flow velocity of the battery wastewater in the first flow channel is between 1 m / s and 5 m / s; and / or, the battery wastewater recycling and treatment system further includes a second pump, which is disposed between the second inlet and the first outlet, so that the flow velocity of the battery wastewater flowing through the second flow channel is between 2 m / s and 8 m / s.

[0009] According to some embodiments of the present invention, the battery wastewater recycling and treatment system further includes an additive device and an oil-water separator. The additive device is provided with a third inlet, an additive port, and a third outlet. The third inlet is for battery wastewater to enter, and the additive port is used to add an activator. The first pump is located between the third outlet and the first inlet. The oil-water separator is provided with an input port that communicates with the first outlet. The top of the oil-water separator is provided with a first outlet, and the bottom of the oil-water separator is provided with a second outlet that communicates with the second inlet.

[0010] According to some embodiments of the present invention, the electrolytic flotation device includes a first housing, two first conductive plates, a plurality of first anode plates, and a plurality of first cathode plates. The first housing forms a first electrolytic chamber. The two first conductive plates are arranged side by side in the first electrolytic chamber. The plurality of first anode plates and the plurality of first cathode plates are arranged alternately between the two first conductive plates. The first anode plates and the first cathode plates are both perpendicular to the first conductive plates. One of the adjacent first anode plates and the first cathode plates is connected to one of the first conductive plates, and the other is connected to the other first conductive plate. The first conductive plates, the first anode plates, and the first cathode plates enclose and form the first flow channel.

[0011] According to some embodiments of the present invention, the current density of the electrolytic flotation device is 50 A / m³. 2 Up to 200A / m 2 Between; and / or, the spacing between adjacent first anode plates and first cathode plates is between 0.5 cm and 3 cm.

[0012] According to some embodiments of the present invention, the first anode plate is at least one of graphite plate, iridium plate, lead dioxide plate, and BDD plate, and the first cathode plate is at least one of graphite plate, stainless steel plate, and titanium plate.

[0013] According to some embodiments of the present invention, the BDD electrocatalytic oxidation reactor includes a second shell, two second conductive plates, a plurality of second anode plates, and a plurality of second cathode plates. The second shell forms a second electrolysis chamber. The two second conductive plates are arranged side by side in the second electrolysis chamber. The plurality of second anode plates and the plurality of second cathode plates are arranged alternately between the two second conductive plates. The second anode plates and the second cathode plates are both perpendicular to the second conductive plates. One of the adjacent second anode plates and the second cathode plates is connected to one of the second conductive plates, and the other is connected to the other second conductive plate. The second conductive plates, the second anode plates, and the second cathode plates enclose and form the second flow channel.

[0014] According to some embodiments of the present invention, the current density of the BDD electrocatalytic oxidation reactor is 200 A / m³. 2 Up to 800A / m 2 Between; and / or, the spacing between adjacent second anode plates and second cathode plates is between 0.2 cm and 10 cm.

[0015] According to some embodiments of the present invention, the second anode plate is a BDD plate, and the second cathode plate is at least one of a graphite plate, a stainless steel plate, and a titanium plate.

[0016] According to a second aspect of the present invention, a battery wastewater recycling and treatment method, based on the battery wastewater recycling and treatment system described in the first aspect of the present invention, includes the following steps:

[0017] Add an activator to the battery wastewater;

[0018] Battery wastewater mixed with activator is pumped into the first flow channel of the electrolytic flotation device. The electrolytic flotation device performs an electrochemical reaction on the battery wastewater to convert emulsified oil, colloidal oil and some soluble oil in the battery wastewater into insoluble oil droplets, and removes some soluble oil through electrocatalytic oxidation. At the same time, the electrolysis of water generates gas, which forms micro-nano bubbles under the flow of battery wastewater at a preset flow rate, so as to remove insoluble oil droplets by flotation.

[0019] The battery wastewater after removing the floating oil is fed into the second flow channel of the BDD electrocatalytic oxidation reactor, which then electrocatalytically oxidizes and removes the remaining soluble oil in the battery wastewater.

[0020] The battery wastewater recycling and treatment method according to embodiments of the present invention has at least the following beneficial effects:

[0021] The battery wastewater recycling and treatment system according to the first aspect of this invention sets the first flow channel of the electrolytic flotation device as a narrow, tortuous channel. A first pump keeps the flow velocity of the battery wastewater within the first flow channel within a preset range, facilitating the formation of micro-nano bubbles. The electrolytic flotation device performs electrochemical reactions on emulsified oil, colloidal oil, and some soluble oils, converting them into insoluble oil droplets that can be adsorbed onto the micro-nano bubbles to form easily removable floating oil. Furthermore, the electrolytic flotation device can electrocatalytically oxidize and remove some of the soluble oil in the battery wastewater. Finally, the remaining soluble oil is removed by electrocatalytic oxidation using a BDD electrocatalytic oxidation reactor with a large electrode potential. This system not only boasts high oil removal efficiency and is simpler and more convenient, but also effectively removes soluble oil from wastewater. In addition, it has lower operating costs and is easier to operate and manage.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the battery wastewater recycling and treatment system according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of an electrolytic flotation device;

[0026] Figure 3 This is a schematic diagram of the BDD electrocatalytic oxidation reactor.

[0027] Icon labels:

[0028] Electrolytic flotation device 100; first liquid inlet 101; first liquid outlet 102; first flow channel 103; first housing 104; first conductive plate 105; first anode plate 106; first cathode plate 107; first high-frequency switching power supply 108;

[0029] First pump 200;

[0030] BDD electrocatalytic oxidation reactor 300; second inlet 301; second outlet 302; second flow channel 303; second shell 304; second conductive plate 305; second anode plate 306; second cathode plate 307; second high-frequency switching power supply 308; circulation pipe 309;

[0031] Second pump 400;

[0032] Adding device 500; third liquid inlet 501; adding port 502; third liquid outlet 503; stirring mechanism 504;

[0033] Oil-water separator 600; inlet 601; first outlet 602; second outlet 603. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0036] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0037] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0038] The following is for reference. Figures 1 to 3 A battery wastewater recycling and treatment system and method according to embodiments of the present invention are described.

[0039] refer to Figures 1 to 3 As shown, the battery wastewater recycling and treatment system according to a first aspect embodiment of the present invention includes an electrolytic flotation device 100, a first pump 200, and a BDD electrocatalytic oxidation reactor 300.

[0040] The electrolytic flotation device 100 is provided with a first inlet 101 and a first outlet 102. The first inlet 101 is for battery wastewater mixed with a high charge density activator to enter, and the first outlet 102 is for discharging the battery wastewater after catalytic oxidation and removal of floating oil. A first flow channel 103 is formed between the first inlet 101 and the first outlet 102. The first flow channel 103 is a tortuous flow channel. The electrolytic flotation device 100 is used to perform an electrochemical reaction on the battery wastewater in the first flow channel 103. The activator can be a high charge density coagulant or... Surface activators, especially those with high charge density, can alter the isoelectric point, surface charge, and charge density of ultra-stable emulsified oil, colloidal oil, and soluble oil in battery wastewater. Coupled with the electric field generated by the electrolytic flotation device 100, they can perform polarization, destabilization, charge migration, and electrolysis, destabilizing and agglomerating the oil into insoluble droplets. The electrolytic flotation device 100 can also electrocatalytically oxidize some soluble oils to decompose them into water and carbon dioxide, thereby removing some of the soluble oils. The electrolytic flotation device 100 can also electrolyze water to produce gases such as hydrogen and oxygen.

[0041] The first pump 200 is connected to the first inlet 101 so that the flow velocity of the battery wastewater flowing through the first flow channel 103 is within a preset range that enables the gas to form micro-nano bubbles. Specifically, the battery wastewater within this flow velocity range can form turbulence when flowing in the narrow and tortuous first flow channel 103. Through high-speed vertical cutting, gases such as hydrogen and oxygen can be formed into micro-nano bubbles. Insoluble oil droplets can be adsorbed on the micro-nano bubbles and float to the surface with the micro-nano bubbles to form floating oil. That is, air flotation is performed through micro-nano bubbles to facilitate the removal of insoluble oil droplets.

[0042] The BDD electrocatalytic oxidation reactor 300 is provided with a second inlet 301 and a second outlet 302. The second inlet 301 is connected to the first outlet 102. A second flow channel 303 is formed between the second inlet 301 and the second outlet 302. The BDD electrocatalytic oxidation reactor 300 uses a BDD electrode plate as the anode plate. Compared with traditional electrode plates, it has a larger electrode potential and can electrocatalytically oxidize the remaining carbonates, organophosphorus compounds and other soluble oils in the battery wastewater in the second flow channel 303 to degrade them into water and carbon dioxide and other inorganic substances.

[0043] In this invention, when it is necessary to remove emulsified oil, colloidal oil, and soluble oil from battery wastewater, a high charge density activator is added to the battery wastewater for activation. This activated wastewater is then pumped into the first flow channel 103 of the electrolytic flotation device 100 by a first pump 200. The electrolytic flotation device 100 performs an electrochemical reaction on the battery wastewater in the first flow channel 103, converting the emulsified oil, colloidal oil, and some soluble oil in the wastewater into insoluble oil droplets. It also electrocatalytically oxidizes and removes some of the soluble oil in the battery wastewater. Simultaneously, the electrolysis of the battery wastewater produces hydrogen, oxygen, and other gases, which are then released by the first pump 200. The driving force keeps the flow rate of the battery wastewater flowing through the first flow channel 103 within a preset range. When the battery wastewater flows within the narrow and tortuous first flow channel 103 within this flow rate range, it can cause gases such as hydrogen and oxygen to form micro-nano bubbles. Insoluble oil droplets will then adhere to the micro-nano bubbles and float to the surface with them to form floating oil. After the floating oil is removed, the battery wastewater after the floating oil is removed is fed into the BDD electrocatalytic oxidation reactor 300. The BDD electrocatalytic oxidation reactor 300 has a large electrode potential and can electrocatalytically oxidize the remaining soluble oil in the battery wastewater to remove the remaining soluble oil.

[0044] According to the battery wastewater recycling and treatment system of the present invention, the first flow channel 103 of the electrolytic flotation device 100 is configured as a narrow, tortuous flow channel. The flow velocity of the battery wastewater in the first flow channel 103 is kept within a preset range by the first pump 200, which facilitates the formation of micro-nano bubbles. The electrolytic flotation device 100 performs electrochemical reactions on emulsified oil, colloidal oil and some soluble oil, and the resulting insoluble oil droplets can be adsorbed on the micro-nano bubbles for flotation to form easily removable floating oil. The electrolytic flotation device 100 can also remove some soluble oil by electrocatalytic oxidation. Finally, the remaining soluble oil can be removed by electrocatalytic oxidation using the BDD electrocatalytic oxidation reactor 300 with a large electrode potential. This system not only has high oil removal efficiency and is simpler and more convenient, but also effectively removes soluble oil from battery wastewater. In addition, it has lower operating costs and is easier to operate and manage.

[0045] It should be noted that the electrode potentials of traditional commercial electrode plates such as ruthenium-iridium, lead dioxide, and iridium-tantalum plates are only 1.2V, 1.7V, and 1.5V, respectively, which are lower than the electrode potentials required for the degradation of soluble oils such as carbonates and organophosphorus compounds. In contrast, the BDD electrode plates of the BDD electrocatalytic oxidation reactor 300 generally have an electrode potential of 2.8V to 3.2V. Electrode potentials within this range can completely degrade soluble oils such as carbonates and organophosphorus compounds.

[0046] In some embodiments of the present invention, the flow velocity of the battery wastewater in the first flow channel 103 is between 1 m / s and 5 m / s. For example, the flow velocity of the battery wastewater in the first flow channel 103 can be 1 m / s, 2 m / s, 3 m / s, 4 m / s, 5 m / s, or other suitable flow velocities. In this embodiment, the flow velocity of the battery wastewater in the first flow channel 103 is between 1 m / s and 5 m / s. Thus, when the battery wastewater within this flow velocity range flows in the narrow and tortuous first flow channel 103, it allows gases such as hydrogen and oxygen to better form micro-nano bubbles, thereby facilitating the formation of floating oil. Moreover, the faster flow velocity of the battery wastewater results in higher wastewater treatment efficiency.

[0047] refer to Figure 1As shown, in some embodiments of the present invention, the battery wastewater recycling and treatment system further includes a second pump 400, which is disposed between the second inlet 301 and the first outlet 102, so that the flow velocity of the battery wastewater flowing through the second channel 303 is between 2 m / s and 8 m / s. For example, the second pump 400 can pump the battery wastewater flowing out of the first outlet 102 into the second channel 303 of the BDD electrocatalytic oxidation reactor 300 through the second inlet 301. The flow velocity of the battery wastewater flowing through the second channel 303 can be 2 m / s, 3 m / s, 4 m / s, 5 m / s, 6 m / s, 7 m / s, 8 m / s, or other suitable flow velocities. In this embodiment, the second pump 400 is provided, and the flow velocity of the battery wastewater flowing through the second channel 303 is kept between 2 m / s and 8 m / s by the second pump 400, thus making the battery wastewater treatment efficiency higher.

[0048] refer to Figure 1 As shown, in some embodiments of the present invention, the battery wastewater recycling and treatment system further includes an adding device 500. The adding device 500 is provided with a third inlet 501, an adding port 502 and a third outlet 503. The third inlet 501 is for battery wastewater to enter, the adding port 502 is for adding activator, and the first pump 200 is located between the third outlet 503 and the first inlet 101. For example, the third inlet 501 and the addition port 502 can be located at the top of the adding device 500. The third inlet 501 allows battery wastewater to enter, and the addition port 502 is used to add activator. The third outlet 503 can be located at the bottom of the adding device 500, allowing the battery wastewater mixed with activator to be discharged. The first pump 200 is located between the third outlet 503 and the first inlet 101 to pump the battery wastewater discharged from the third outlet 503 into the first flow channel 103 of the electrolytic flotation device 100 through the first inlet 101. The adding device 500 can also be equipped with a stirring mechanism 504, which is used to mix the battery wastewater and activator evenly. In this embodiment, the addition device 500 makes it easier to add activator to the battery wastewater and ensures that the battery wastewater and activator are mixed evenly.

[0049] refer to Figure 1As shown, in some embodiments of the present invention, the oil-water separator 600 is provided with an inlet 601, which is connected to the first outlet 102. The top of the oil-water separator 600 is provided with a first outlet 602, and the bottom of the oil-water separator 600 is provided with a second outlet 603, which is connected to the second inlet 301. For example, the first outlet 602 can be an oil phase outlet, and the second outlet 603 can be a water phase outlet. The first outlet 602 is located above the second outlet 603. In this embodiment, taking advantage of the floating oil on the surface of the battery wastewater, the oil-water separator 600 can quickly remove the floating oil, making the operation simple, convenient, time-saving, and labor-saving.

[0050] refer to Figure 2 As shown, in some embodiments of the present invention, the electrolytic flotation device 100 includes a first housing 104, two first conductive plates 105, a plurality of first anode plates 106, and a plurality of first cathode plates 107. The first housing 104 forms a first electrolytic chamber. The two first conductive plates 105 are arranged side by side in the first electrolytic chamber. The surfaces of the first conductive plates 105 can be vertically arranged, and the surfaces of the two first conductive plates 105 are parallel to each other. A first high-frequency switching power supply 108 is connected between the two first conductive plates 105 through a wire. The plurality of first anode plates 106 and the plurality of first cathode plates 107 are also included. A cathode plate 107 is staggered between two first conductive plates 105. The surfaces of the first anode plate 106 and the first cathode plate 107 can be vertically arranged, and the surfaces of the first anode plate 106 and the first cathode plate 107 are perpendicular to the surface of the first conductive plate 105. One of the adjacent first anode plate 106 and the first cathode plate 107 is connected to one of the first conductive plates 105, and the other is connected to the other first conductive plate 105. The first conductive plates 105, the first anode plate 106, and the first cathode plate 107 enclose and form a first flow channel 103.

[0051] In this embodiment, the first flow channel 103 formed by the first conductive plate 105, the first anode plate 106, and the first cathode plate 107 is a reciprocating bent flow channel. This makes it easier for the battery wastewater flowing through the first flow channel 103 to form turbulence, and further facilitates the formation of micro-nano bubbles by gases such as hydrogen and oxygen, resulting in a better oil float effect. Moreover, it allows the battery wastewater to flow over a wider range. At the same time, the multiple first anode plates 106 and multiple first cathode plates 107 are arranged in an alternating manner, which makes the contact between the plates and the battery wastewater more comprehensive and uniform, resulting in a better electrocatalytic oxidation effect on the battery wastewater.

[0052] In some embodiments of the present invention, the current density of the electrolytic flotation device 100 is 50 A / m³. 2 Up to 200A / m 2 Between. For example, the current density during operation of the electrolytic flotation unit 100 can be 50 A / m. 2 100A / m2 150A / m 2 200A / m 2 Or other suitable values. The distance between adjacent first anode plates 106 and first cathode plates 107 is between 0.5 cm and 3 cm. For example, the distance between adjacent first anode plates 106 and first cathode plates 107 can be 0.5 cm, 1 cm, 1.5 cm, 2 cm, 2.5 cm, 3 cm or other suitable dimensions.

[0053] In this embodiment, the current density of the electrolytic flotation device 100 is 50 A / m³. 2 Up to 200A / m 2 The distance between adjacent first anode plates 106 and first cathode plates 107 is between 0.5 cm and 3 cm. This not only improves the electrocatalytic oxidation effect on battery wastewater, thus better converting emulsified oil, colloidal oil and some soluble oil in battery wastewater into insoluble oil droplets, but also facilitates the formation of micro-nano bubbles by gases such as hydrogen and oxygen, thereby improving the formation of floating oil.

[0054] In some embodiments of the present invention, the first anode plate 106 is at least one of a graphite plate, an iridium plate, a lead dioxide plate, and a BDD plate, and the first cathode plate 107 is at least one of a graphite plate, a stainless steel plate, and a titanium plate. This results in a better electrocatalytic oxidation effect of the electrolytic flotation device 100 on battery wastewater, and further improves the conversion of emulsified oil, colloidal oil, and some soluble oil in the battery wastewater into insoluble oil droplets.

[0055] refer to Figure 3 As shown, in some embodiments of the present invention, the BDD electrocatalytic oxidation reactor 300 includes a second shell 304, two second conductive plates 305, a plurality of second anode plates 306, and a plurality of second cathode plates 307. The second shell 304 forms a second electrolysis chamber. The two second conductive plates 305 are arranged side by side in the second electrolysis chamber. The surfaces of the second conductive plates 305 can be vertically arranged, and the surfaces of the two second conductive plates 305 are parallel to each other. A second high-frequency switching power supply 308 is connected between the two second conductive plates 305 by wires. The plurality of second anode plates 306 and a plurality of second cathode plates 307 are also included. A second cathode plate 307 is staggered between two second conductive plates 305. The surfaces of the second anode plate 306 and the second cathode plate 307 can be vertically arranged, and the surfaces of the second anode plate 306 and the second cathode plate 307 are perpendicular to the surface of the second conductive plate 305. One of the adjacent second anode plate 306 and the second cathode plate 307 is connected to one of the second conductive plates 305, and the other is connected to the other second conductive plate 305. The second conductive plates 305, the second anode plate 306 and the second cathode plate 307 enclose and form a second flow channel 303.

[0056] In this embodiment, the second flow channel 303 formed by the second conductive plate 305, the second anode plate 306, and the second cathode plate 307 is a reciprocating bent flow channel. This allows the battery wastewater to flow over a wider area. At the same time, the multiple second anode plates 306 and multiple second cathode plates 307 are arranged in an alternating manner, which makes the contact between the plates and the battery wastewater more comprehensive and uniform, resulting in a better electrocatalytic oxidation effect on the battery wastewater.

[0057] It should be noted that the water discharged from the second outlet 302 can re-enter the oil-water separator 600 through the circulation pipe 309 for oil-water separation, and then undergo repeated electrocatalytic oxidation through the BDD electrocatalytic oxidation reactor 300 until all soluble oil is completely degraded and removed.

[0058] In some embodiments of the present invention, the current density of the BDD electrocatalytic oxidation reactor 300 is 200 A / m³. 2 Up to 800A / m 2 Between. For example, the current density during operation of the BDD electrocatalytic oxidation reactor 300 can be 200 A / m. 2 300A / m 2 400A / m 2 500A / m 2 600A / m 2 700A / m 2 800A / m 2 Or other suitable values. The distance between adjacent second anode plates 306 and second cathode plates 307 is between 0.2 cm and 10 cm. For example, the distance between adjacent second anode plates 306 and second cathode plates 307 can be 0.2 cm, 1 cm, 3 cm, 5 cm, 8 cm, 10 cm or other suitable dimensions.

[0059] In this embodiment, the current density of the BDD electrocatalytic oxidation reactor 300 is 200 A / m. 2 Up to 800A / m 2 The spacing between adjacent second anode plates 306 and second cathode plates 307 is between 0.2 cm and 10 cm. This not only improves the electrocatalytic oxidation effect of battery wastewater, but also makes the flow rate of battery wastewater faster when it flows through the second flow channel 303, thus resulting in higher battery wastewater treatment efficiency.

[0060] In some embodiments of the present invention, the second anode plate 306 is a BDD electrode plate, and the second cathode plate 307 is at least one of a graphite electrode plate, a stainless steel electrode plate, and a titanium electrode plate. This results in a better electrocatalytic oxidation effect of the BDD electrocatalytic oxidation reactor 300 on battery wastewater, thereby improving the degradation effect of the remaining soluble oil in the battery wastewater.

[0061] According to a second aspect of the present invention, a battery wastewater recycling and treatment method based on the battery wastewater recycling and treatment system of the first aspect of the present invention includes the following steps:

[0062] Add a high charge density activator to the battery wastewater;

[0063] Battery wastewater mixed with a high charge density activator is pumped into the first flow channel 103 of the electrolytic flotation device 100. The electrolytic flotation device 100 performs an electrochemical reaction on the battery wastewater to convert the emulsified oil, colloidal oil and some soluble oil in the battery wastewater into insoluble oil droplets, and removes some soluble oil through electrocatalytic oxidation. At the same time, the electrolysis of water generates gas, which forms micro-nano bubbles under the flow of battery wastewater at a preset flow rate, so that the insoluble oil droplets attach and float to form floating oil, which is then removed.

[0064] The battery wastewater after removing the floating oil is fed into the second channel 303 of the BDD electrocatalytic oxidation reactor 300. The BDD electrocatalytic oxidation reactor 300 electrocatalytically oxidizes the remaining soluble oil in the battery wastewater to remove the remaining soluble oil.

[0065] According to the battery wastewater recycling and treatment method of the present invention, by adopting the battery wastewater recycling and treatment system of the first aspect of the present invention, the first flow channel 103 of the electrolytic flotation device 100 is set as a narrow and tortuous flow channel. The flow velocity of the battery wastewater in the first flow channel 103 is kept within a preset range by the first pump 200, which facilitates the formation of micro-nano bubbles. The electrolytic flotation device 100 performs electrochemical reactions on emulsified oil, colloidal oil and some soluble oil, and the converted insoluble oil droplets can be adsorbed on the micro-nano bubbles to form easily removable floating oil. The electrolytic flotation device 100 can remove some soluble oil by electrocatalytic oxidation. Finally, the remaining soluble oil can be removed by electrocatalytic oxidation using the BDD electrocatalytic oxidation reactor 300 with a large electrode potential. This method not only has high oil removal efficiency and is simpler and more convenient, but also effectively removes soluble oil from wastewater. In addition, the operating cost is lower and the operation and management difficulty is reduced.

[0066] It should be noted that since the battery wastewater recycling and treatment method can adopt all the technical solutions of the battery wastewater recycling and treatment system of the first aspect embodiment, it has at least all the beneficial effects brought about by the technical solutions of the first aspect embodiment. These additional beneficial effects will not be elaborated here.

[0067] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A battery wastewater recycling and treatment system, characterized in that, include: An electrolytic flotation device is provided with a first inlet and a first outlet, and a first flow channel is formed between the first inlet and the first outlet. The first flow channel is a tortuous flow channel. The electrolytic flotation device is used to carry out an electrochemical reaction on battery wastewater mixed with activator in the first flow channel, so that the emulsified oil, colloidal oil and some soluble oil in the battery wastewater are converted into insoluble oil droplets, and some soluble oil is removed by electrocatalytic oxidation. At the same time, gas is generated by electrolysis of water. A first pump is connected to the first liquid inlet to ensure that the flow rate of the battery wastewater flowing through the first flow channel is within a preset range that allows the gas to form micro-nano bubbles. The micro-nano bubbles are used to remove the insoluble oil droplets by flotation. The BDD electrocatalytic oxidation reactor is provided with a second inlet and a second outlet. The second inlet is connected to the first outlet, and a second flow channel is formed between the second inlet and the second outlet. The BDD electrocatalytic oxidation reactor is used to remove the remaining soluble oil in the battery wastewater in the second flow channel by electrocatalytic oxidation. The flow velocity of the battery wastewater in the first flow channel is between 1 m / s and 5 m / s; The current density of the electrolytic flotation device is between 50 A / m² and 200 A / m². The electrolytic flotation device includes: The first shell has a first electrolysis chamber; Two first conductive plates are arranged side by side in the first electrolysis chamber; Multiple first anode plates and multiple first cathode plates are staggered between two first conductive plates. The first anode plates and the first cathode plates are perpendicular to the first conductive plates. One of the adjacent first anode plates and the first cathode plates is connected to one of the first conductive plates, and the other is connected to the other first conductive plate. The first conductive plates, the first anode plates, and the first cathode plates enclose and form the first flow channel. The distance between adjacent first anode plates and first cathode plates is between 0.5 cm and 3 cm; The battery wastewater recycling and treatment system also includes: The addition device is provided with a third liquid inlet, an addition port and a third liquid outlet. The third liquid inlet is for battery wastewater to enter, the addition port is for adding activator, and the first pump is located between the third liquid outlet and the first liquid inlet. An oil-water separator is provided with an inlet, which is connected to a first outlet. The top of the oil-water separator is provided with a first outlet, and the bottom of the oil-water separator is provided with a second outlet, which is connected to a second inlet. The BDD electrocatalytic oxidation reactor includes: The second shell has a second electrolysis chamber; Two second conductive plates are arranged side by side in the second electrolysis chamber; Multiple second anode plates and multiple second cathode plates are staggered between two second conductive plates. The second anode plates and the second cathode plates are perpendicular to the second conductive plates. One of the adjacent second anode plates and the second cathode plates is connected to one of the second conductive plates, and the other is connected to the other second conductive plate. The second conductive plates, the second anode plates, and the second cathode plates enclose and form the second flow channel. The distance between adjacent second anode plates and second cathode plates is between 0.2 cm and 10 cm.

2. The battery wastewater recycling and treatment system according to claim 1, characterized in that, The battery wastewater recycling and treatment system also includes a second pump, which is located between the second inlet and the first outlet, so that the flow velocity of the battery wastewater flowing through the second channel is between 2 m / s and 8 m / s.

3. The battery wastewater recycling and treatment system according to claim 1, characterized in that, The first anode plate is at least one of graphite plate, iridium plate, lead dioxide plate, and BDD plate, and the first cathode plate is at least one of graphite plate, stainless steel plate, and titanium plate.

4. The battery wastewater recycling and treatment system according to claim 1, characterized in that, The BDD electrocatalytic oxidation reactor operates at a current density between 200 A / m² and 800 A / m².

5. The battery wastewater recycling and treatment system according to claim 1, characterized in that, The second anode plate is a BDD plate, and the second cathode plate is at least one of a graphite plate, a stainless steel plate, and a titanium plate.

6. A method for recycling and treating battery wastewater, based on the battery wastewater recycling and treatment system according to any one of claims 1 to 5, characterized in that, include: Add an activator to the battery wastewater; Battery wastewater mixed with activator is pumped into the first channel of the electrolytic flotation device at a flow rate of 1 m / s to 5 m / s. The electrolytic flotation device performs an electrochemical reaction on the battery wastewater at a current density of 50 A / m² to 200 A / m², so that the emulsified oil, colloidal oil and some soluble oil in the battery wastewater are converted into insoluble oil droplets, and some soluble oil is removed by electrocatalytic oxidation. At the same time, the electrolysis of water generates gas, which forms micro-nano bubbles under the flow of battery wastewater at a preset flow rate, so as to remove the insoluble oil droplets by flotation. The battery wastewater after removing the floating oil is fed into the second flow channel of the BDD electrocatalytic oxidation reactor, which removes the remaining soluble oil in the battery wastewater through electrocatalytic oxidation. The electrolytic flotation device includes: The first shell has a first electrolysis chamber; Two first conductive plates are arranged side by side in the first electrolysis chamber; Multiple first anode plates and multiple first cathode plates are staggered between two first conductive plates. The first anode plates and the first cathode plates are perpendicular to the first conductive plates. One of the adjacent first anode plates and the first cathode plates is connected to one of the first conductive plates, and the other is connected to the other first conductive plate. The first conductive plates, the first anode plates, and the first cathode plates enclose and form the first flow channel. The distance between adjacent first anode plates and first cathode plates is between 0.5 cm and 3 cm.

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