Battery wastewater recycling system and method

Abstract

The invention discloses a battery wastewater recovery treatment system and method.The battery wastewater recovery treatment system comprises an electrolytic flotation device, a first pump and a BDD electrocatalytic oxidation reactor, the electrolytic flotation device is provided with a first liquid inlet and a first liquid outlet, a first flow channel is formed between the first liquid inlet and the first liquid outlet, the first flow channel is a bent flow channel, and a second flow channel is formed between the first pump and the BDD electrocatalytic oxidation reactor; the electrolytic flotation device is used for carrying out electrochemical reaction on the battery wastewater in the first flow channel so as to convert emulsified oil, colloidal oil and part of soluble oil in the battery wastewater into insoluble oil drops and electrolyze water to generate gas, the first pump machine is connected to the first liquid inlet, the BDD electrocatalytic oxidation reactor is provided with a second liquid inlet and a second liquid outlet, and the second pump machine is connected to the second liquid inlet. The second liquid inlet is communicated with the first liquid outlet, and a second flow channel is formed between the second liquid inlet and the second liquid outlet. According to the battery wastewater recovery treatment system and method, the oil removal efficiency can be improved, oil removal is simpler and more convenient, the operation cost is lower, and the control and management difficulty is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of battery recycling, and in particular to a battery wastewater recycling treatment system and method. Background Art

[0002] Battery wastewater contains various oils, among which emulsified oil and soluble oil are difficult to remove. If not handled in time, it will affect the subsequent recycling and treatment process of battery wastewater. In related technologies, resin adsorption is generally used for oil removal. Although resin can remove some emulsified oil and soluble oil, the oil removal efficiency is low, especially for soluble oil. In addition, resin needs to be regenerated with ethanol, and ethanol needs to be distilled and reused, resulting in very complex process technology, high operating costs, and difficulty in control and management. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery wastewater recycling and treatment system, which can not only improve the oil removal efficiency, make oil removal simpler and more convenient, but also effectively remove soluble oil in wastewater, and has lower operating costs and less difficulty in operation and management.

[0004] The present invention also proposes a recycling method based on the battery waste water recycling system.

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

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

[0007] When it is necessary to remove the emulsified oil, colloidal oil and soluble oil in the battery wastewater, an activator with a high charge density is added to the battery wastewater and pumped into the first flow channel of the electrolytic flotation device through the first pump. The electrolytic flotation device performs an electrochemical reaction on the battery wastewater in the first flow channel to convert the emulsified oil, colloidal oil and part of the soluble oil in the battery wastewater into insoluble oil droplets, and removes part of the soluble oil in the battery wastewater by electrocatalytic oxidation. At the same time, the water in the battery wastewater is electrolyzed to generate hydrogen, oxygen and other gases, which are driven by the first pump to flow through the first flow channel. The flow rate of the battery waste water in a flow channel is within a preset range. When the battery waste water within the flow rate range flows in the narrow and tortuous first flow channel, gases such as hydrogen and oxygen can form micro-nano bubbles, and insoluble oil droplets will then adhere to the micro-nano bubbles and float up with the micro-nano bubbles to form floating oil, which is then removed. Finally, the battery waste water after the floating oil is removed is input into a BDD electrocatalytic oxidation reactor. The BDD electrocatalytic oxidation reactor has a large electrode potential and can electrocatalytically oxidize the remaining soluble oil in the battery waste water to remove the remaining soluble oil. According to the battery waste water recycling and treatment system of the embodiment of the present invention, the first flow channel of the electrolytic flotation device is set as a narrow curved flow channel, and the flow rate of the battery waste water in the first flow channel is made within a preset range by the first pump, so that the gas can form micro-nano bubbles conveniently, and the electrolytic flotation device performs electrochemical reaction on the emulsified oil, the colloidal oil and some soluble oil, and the converted insoluble oil droplets can be adsorbed on the micro-nano bubbles to form floating oil that is easy to remove, and the electrolytic flotation device can remove some soluble oil in the battery waste water by electrocatalytic oxidation, and finally the BDD electrocatalytic oxidation reactor with a large electrode potential is used to perform electrocatalytic oxidation to remove the remaining soluble oil, which not only has high oil removal efficiency, but also is simpler and more convenient, and can effectively remove the soluble oil in the battery waste water, and in addition, the operating cost is lower, and the control and management difficulty is less.

[0008] According to some embodiments of the present invention, the flow rate of the battery waste water in the first flow channel is between 1m / s and 5m / s; and / or, the battery waste water recovery and treatment system also includes a second pump, which is arranged between the second liquid inlet and the first liquid outlet, so that the flow rate of the battery waste water flowing through the second flow channel is between 2m / s and 8m / s.

[0009] According to some embodiments of the present invention, the battery wastewater recovery and treatment system also includes an adding device and an oil-water separator, the adding device is provided with a third liquid inlet, an adding port and a third liquid outlet, the third liquid inlet is for battery wastewater to enter, the adding port is used to add an activator, and the first pump is arranged between the third liquid outlet and the first liquid inlet; the oil-water separator is provided with an input port, the input port is connected with the first liquid outlet, the top end of the oil-water separator is provided with a first outlet, the bottom end of the oil-water separator is provided with a second outlet, and the second outlet is connected with the second liquid inlet.

[0010] According to some embodiments of the present invention, the electrolytic flotation device includes a first shell, two first conductive plates, a plurality of first anode plates and a plurality of first cathode plates, the first shell 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 staggered 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, and the first conductive plate, the first anode plate and the first cathode plate enclose the first flow channel.

[0011] According to some embodiments of the present invention, the current density of the electrolytic flotation device is 50A / m 2 Up to 200A / m 2 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 a graphite plate, an iridium plate, a lead dioxide plate, and a BDD plate, and the first cathode plate is at least one of a graphite plate, a stainless steel plate, and a 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, two second conductive plates are arranged side by side in the second electrolysis chamber, a plurality of second anode plates and a plurality of second cathode plates are arranged alternately between the two second conductive plates, the second anode plate and the second cathode plate are both perpendicular to the second conductive plates, one of the adjacent second anode plates and the second cathode plate is connected to one of the second conductive plates, and the other is connected to the other second conductive plate, and the second conductive plate, the second anode plate and the second cathode plate enclose the second flow channel.

[0014] According to some embodiments of the present invention, the BDD electrocatalytic oxidation reactor operates at a current density of 200 A / m 2 Up to 800A / m 2 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 the battery waste water recycling method of the second embodiment of the present invention, based on the battery waste water recycling system described in the first embodiment, the battery waste water recycling method comprises the following steps:

[0017] adding an activator to the battery wastewater;

[0018] The battery waste water mixed with the activator is pumped into the first flow channel of the electrolytic flotation device, and the electrolytic flotation device performs an electrochemical reaction on the battery waste water to convert the emulsified oil, colloidal oil and part of the soluble oil in the battery waste water into insoluble oil droplets, and removes part of the soluble oil by electrocatalytic oxidation, and at the same time, the water is electrolyzed to generate gas, and the gas forms micro-nano bubbles under the flow of the battery waste water at a flow rate within a preset range, so that the insoluble oil droplets are removed by flotation;

[0019] The battery wastewater after the floating oil is removed is input into the second flow channel of the BDD electrocatalytic oxidation reactor, and the BDD electrocatalytic oxidation reactor removes the remaining soluble oil in the battery wastewater by electrocatalytic oxidation.

[0020] The battery waste water recycling method according to the embodiment of the present invention has at least the following beneficial effects:

[0021] In the battery waste water recovery and treatment system of the first embodiment of the present invention, the first flow channel of the electrolytic flotation device is set as a narrow curved flow channel, and the flow rate of the battery waste water in the first flow channel is made within a preset range by a first pump, so that the gas can form micro-nano bubbles conveniently, and the electrolytic flotation device performs electrochemical reaction on the emulsified oil, the colloidal oil and some soluble oil, and the converted insoluble oil droplets can be adsorbed on the micro-nano bubbles to form floating oil that is easy to remove, and the electrolytic flotation device can remove some of the soluble oil in the battery waste water by electrocatalytic oxidation, and finally the BDD electrocatalytic oxidation reactor with a large electrode potential is used to perform electrocatalytic oxidation to remove the remaining soluble oil, which not only has high oil removal efficiency, but also is simpler and more convenient, and can effectively remove the soluble oil in the waste water, and in addition, has lower operating costs and less difficulty in control and management.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and some additional aspects and advantages will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 1 A schematic diagram of the structure of a battery wastewater recycling system according to an embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of an electrolytic flotation device;

[0026] Figure 3 Schematic diagram of the structure of the BDD electrocatalytic oxidation reactor.

[0027] Figure Number:

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

[0029] A first pump 200;

[0030] BDD electrocatalytic oxidation reactor 300; second liquid inlet 301; second liquid 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] A 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; input port 601; first outlet 602; second outlet 603. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

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

[0036] In the description of the present invention, "a plurality" refers to two or more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] Reference below Figures 1 to 3 A battery waste water recycling system and method according to an embodiment of the present invention are described.

[0039] refer to Figures 1 to 3 As shown, the battery waste water recovery and treatment system according to the first 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 liquid inlet 101 and a first liquid outlet 102. The first liquid inlet 101 is used to supply battery wastewater mixed with an activator with a high charge density, and the first liquid outlet 102 is used to discharge the battery wastewater after power catalytic oxidation and removal of floating oil. A first flow channel 103 is formed between the first liquid inlet 101 and the first liquid outlet 102. The first flow channel 103 is a bent 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 coagulant with a high charge density or Surfactants, activators with high charge density can change the isoelectric point, surface charge and charge density of ultra-stable emulsified oil, colloidal oil and soluble oil in battery wastewater, and couple the electric field generated by the electrolytic flotation device 100 to perform polarization, destabilization, charge migration, electrolysis and other effects, and can destabilize and aggregate into insoluble oil droplets. The electrolytic flotation device 100 can also electrocatalytically oxidize part of the soluble oil to decompose it into water and carbon dioxide to remove part of the soluble oil. The electrolytic flotation device 100 can also electrolyze water to produce hydrogen, oxygen and other gases.

[0041] The first pump 200 is connected to the first liquid inlet 101, so that the flow rate of the battery waste water flowing through the first flow channel 103 is within a preset range that can cause the gas to form micro-nano bubbles. Specifically, the battery waste water within the flow rate range can form turbulence when flowing in the narrow and tortuous first flow channel 103, and can form micro-nano bubbles of hydrogen, oxygen and other gases through high-speed vertical cutting. Insoluble oil droplets can be adsorbed on the micro-nano bubbles and float up with the micro-nano bubbles to form floating oil, that is, gas flotation is performed through the micro-nano bubbles to facilitate the removal of insoluble oil droplets.

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

[0043] In the present invention, when it is necessary to remove the emulsified oil, colloidal oil and soluble oil in the battery wastewater, an activator with a high charge density is added to the battery wastewater for activation, and the activator is pumped into the first flow channel 103 of the electrolytic flotation device 100 through the first pump 200. The electrolytic flotation device 100 performs an electrochemical reaction on the battery wastewater in the first flow channel 103, so that the emulsified oil, colloidal oil and part of the soluble oil in the battery wastewater are converted into insoluble oil droplets, and part of the soluble oil in the battery wastewater is removed by electrocatalytic oxidation. At the same time, the water electrolysis of the battery wastewater generates hydrogen, oxygen and other gases, which are pumped into the battery wastewater through the first pump 200. The driving makes the flow rate of the battery waste water flowing through the first flow channel 103 within a preset range. When the battery waste water within the flow rate range flows in the narrow and tortuous first flow channel 103, gases such as hydrogen and oxygen can form micro-nano bubbles, and insoluble oil droplets will then adhere to the micro-nano bubbles and float up with the micro-nano bubbles to form floating oil, which is then removed. Finally, the battery waste water after the floating oil is removed is input 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 waste water to remove the remaining soluble oil.

[0044] According to the battery waste water recycling and treatment system of the embodiment of the present invention, the first flow channel 103 of the electrolytic flotation device 100 is set as a narrow curved flow channel, and the flow rate of the battery waste water in the first flow channel 103 is within a preset range through the first pump 200, which can facilitate the formation of micro-nano bubbles by gas. The electrolytic flotation device 100 performs electrochemical reactions on emulsified oil, colloidal oil and part of soluble oil. The converted insoluble oil droplets can be adsorbed on micro-nano bubbles for flotation to form floating oil that is easy to remove. The electrolytic flotation device 100 can also perform electrocatalytic oxidation to remove part of the soluble oil. Finally, the BDD electrocatalytic oxidation reactor 300 with a large electrode potential is used to perform electrocatalytic oxidation to remove the remaining soluble oil. Not only is the oil removal efficiency high, the oil removal is simpler and more convenient, and the soluble oil in the battery waste water can be effectively removed. In addition, the operating cost is lower and the control and management difficulty is less.

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

[0046] In some embodiments of the present invention, the flow rate of the battery wastewater in the first flow channel 103 is between 1m / s and 5m / s. For example, the flow rate of the battery wastewater in the first flow channel 103 can be 1m / s, 2m / s, 3m / s, 4m / s, 5m / s or other suitable flow rates. In this embodiment, the flow rate of the battery wastewater in the first flow channel 103 is between 1m / s and 5m / s. In this way, when the battery wastewater within the flow rate range flows in the narrow and tortuous first flow channel 103, it can make hydrogen, oxygen and other gases better form micro-nano bubbles, thereby more conveniently forming oil floating, and the battery wastewater flow rate is faster, and the wastewater treatment efficiency is higher.

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

[0048] refer to Figure 1 As shown, in some embodiments of the present invention, the battery waste water recovery and treatment system also includes a adding device 500, which is provided with a third liquid inlet 501, an adding port 502 and a third liquid outlet 503, the third liquid inlet 501 is for battery waste water to enter, the adding port 502 is used to add an activator, and the first pump 200 is arranged between the third liquid outlet 503 and the first liquid inlet 101. For example, the third liquid inlet 501 and the adding port 502 can be arranged at the top of the adding device 500, the third liquid inlet 501 is for battery wastewater to enter, the adding port 502 is used to add the activator, the third liquid outlet 503 can be arranged at the bottom of the adding device 500, the third liquid outlet 503 is for battery wastewater mixed with the activator to be discharged, and the first pump 200 is arranged between the third liquid outlet 503 and the first liquid inlet 101, so as to pump the battery wastewater discharged from the third liquid outlet 503 into the first flow channel 103 of the electrolytic flotation device 100 through the first liquid inlet 101. The adding device 500 can also be provided with a stirring mechanism 504, and the stirring mechanism 504 is used to stir the battery wastewater and the activator evenly. In this embodiment, the adding device 500 is provided to make it more convenient to add the activator to the battery wastewater and to mix the battery wastewater and the activator evenly.

[0049] refer to Figure 1As shown, in some embodiments of the present invention, the oil-water separator 600 is provided with an input port 601, the input port 601 is communicated with the first liquid outlet 102, the top of the oil-water separator 600 is provided with a first outlet 602, the bottom of the oil-water separator 600 is provided with a second outlet 603, and the second outlet 603 is communicated with the second liquid inlet 301. For example, the first outlet 602 can be an oil phase outlet, the second outlet 603 can be a water phase outlet, and the first outlet 602 is located above the second outlet 603. In this embodiment, the oil-water separator 600 can quickly remove the oil by utilizing the fact that the oil floats on the surface of the battery wastewater, which is simple and convenient to operate, saving time and effort.

[0050] refer to Figure 2 As shown, in some embodiments of the present invention, the electrolytic flotation device 100 includes a first shell 104, two first conductive plates 105, a plurality of first anode plates 106 and a plurality of first cathode plates 107, the first shell 104 forms a first electrolytic chamber, the two first conductive plates 105 are arranged side by side in the first electrolytic chamber, the plate surfaces of the first conductive plates 105 can be arranged vertically, the plate 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 connected to each other through a wire, and the plurality of first anode plates 106 and the plurality of first cathode plates 107 are connected to each other through a wire. A cathode plate 107 is arranged alternately between two first conductive plates 105, and the plate surfaces of the first anode plate 106 and the first cathode plate 107 can be vertically arranged, and the plate surfaces of the first anode plate 106 and the first cathode plate 107 are perpendicular to the plate surfaces of the first conductive plates 105, one of the adjacent first anode plates 106 and first cathode plates 107 is connected to one of the first conductive plates 105, and the other is connected to the other first conductive plate 105, and the first conductive plates 105, the first anode plates 106 and the first cathode plates 107 enclose 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 bending flow channel, so that it is more convenient for the battery waste water flowing through the first flow channel 103 to form turbulence, and then it is more convenient for hydrogen, oxygen and other gases to form micro-nano bubbles, thereby forming a better effect of floating oil, and the battery waste water can flow through a wider range. At the same time, multiple first anode plates 106 and multiple first cathode plates 107 are arranged in an alternating manner, so that the contact between the electrode plates and the battery waste water can be more comprehensive and uniform, and the electrocatalytic oxidation effect of the battery waste water is better.

[0052] In some embodiments of the present invention, the current density of the electrolytic flotation device 100 is 50A / m 2 Up to 200A / m 2 For example, the current density of the electrolytic flotation device 100 can be 50A / m 2 , 100A / m2 , 150A / m 2 , 200A / m 2 Or other suitable values. The spacing between adjacent first anode plates 106 and first cathode plates 107 is between 0.5 cm and 3 cm. For example, the spacing 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 sizes.

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

[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. In this way, the electrolytic flotation device 100 has a better electrocatalytic oxidation effect on battery wastewater, and thus has a better effect of converting emulsified oil, colloidal oil, and partially 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 plate surface of the second conductive plate 305 can be vertically arranged, the plate 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 through a wire, the plurality of second anode plates 306 and the plurality of second cathode plates 307 are connected to the second conductive plate 305 by a wire, and the plurality of second conductive plates 306 and the plurality of second cathode plates 307 are connected to the second conductive plate 305 by a wire. The second cathode plates 307 are alternately arranged between the two second conductive plates 305, the plate surfaces of the second anode plates 306 and the second cathode plates 307 can be vertically arranged, and the plate surfaces of the second anode plates 306 and the second cathode plates 307 are perpendicular to the plate surfaces of the second conductive plates 305, one of the adjacent second anode plates 306 and the second cathode plates 307 is connected to one of the second conductive plates 305, and the other is connected to the other second conductive plate 305, and the second conductive plates 305, the second anode plates 306 and the second cathode plates 307 enclose 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 bending flow channel, so that the battery waste water can flow through a wider range. At the same time, multiple second anode plates 306 and multiple second cathode plates 307 are arranged in a staggered manner, so that the electrode plates can contact the battery waste water more comprehensively and evenly, and the electrocatalytic oxidation effect on the battery waste water is better.

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

[0058] In some embodiments of the present invention, the BDD electrocatalytic oxidation reactor 300 operates at a current density of 200 A / m 2 Up to 800A / m 2 For example, the current density of the BDD electrocatalytic oxidation reactor 300 can be 200A / 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 spacing between adjacent second anode plates 306 and second cathode plates 307 is between 0.2 cm and 10 cm. For example, the spacing 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 sizes.

[0059] In this embodiment, the current density of the BDD electrocatalytic oxidation reactor 300 is 200A / m 2 Up to 800A / m 2 The spacing between the 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 on the battery waste water, but also makes the flow rate of the battery waste water faster when flowing through the second flow channel 303, thereby improving the battery waste water treatment efficiency.

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

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

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

[0063] The battery wastewater mixed with the activator of high charge density 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 part of the soluble oil in the battery wastewater into insoluble oil droplets, and removes part of the soluble oil by electrocatalytic oxidation. At the same time, the water is electrolyzed to generate gas. The gas forms micro-nano bubbles under the flow of the battery wastewater at a preset flow rate, so that the insoluble oil droplets adhere and float to form floating oil, and then the floating oil is removed;

[0064] The battery wastewater after the floating oil is removed is input into the second flow channel 303 of the BDD electrocatalytic oxidation reactor 300, and the BDD electrocatalytic oxidation reactor 300 performs electrocatalytic oxidation on the remaining soluble oil in the battery wastewater to remove the remaining soluble oil.

[0065] According to the battery waste water recycling and treatment method of the embodiment of the present invention, by adopting the battery waste water recycling and treatment system of the first embodiment of the present invention, the first flow channel 103 of the electrolytic flotation device 100 is set to a narrow curved flow channel, and the flow rate of the battery waste water in the first flow channel 103 is made within a preset range by the first pump 200, so that the gas can form micro-nano bubbles conveniently, and the electrolytic flotation device 100 performs an electrochemical reaction on the emulsified oil, the colloidal oil and some soluble oil, and the converted insoluble oil droplets can be adsorbed on the micro-nano bubbles to form floating oil that is easy to remove, and the electrolytic flotation device 100 can remove some soluble oil by electrocatalytic oxidation, and finally the BDD electrocatalytic oxidation reactor 300 with a large electrode potential can be used to remove the remaining soluble oil by electrocatalytic oxidation, which not only has high oil removal efficiency, but also is simpler and more convenient to remove oil, and can effectively remove soluble oil in wastewater, in addition, the operating cost is lower, and the control and management difficulty is less.

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

[0067] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A battery wastewater recycling and treatment system, characterized in that: include: The electrolytic flotation device is provided with a first liquid inlet and a first liquid outlet, a first flow channel is formed between the first liquid inlet and the first liquid outlet, the first flow channel is a bent flow channel, and the electrolytic flotation device is used to perform an electrochemical reaction on the battery waste water mixed with an activator in the first flow channel, so that the emulsified oil, colloidal oil and part of the soluble oil in the battery waste water are converted into insoluble oil droplets, and part of the soluble oil is removed by electrocatalytic oxidation, and at the same time, water is electrolyzed to generate gas; a first pump connected to the first liquid inlet so that the flow rate of the battery waste water flowing through the first flow channel is within a preset range that enables the gas to form micro-nano bubbles, and the micro-nano bubbles are used to flotate and remove the insoluble oil droplets; The BDD electrocatalytic oxidation reactor is provided with a second liquid inlet and a second liquid outlet. The second liquid inlet is connected to the first liquid outlet. A second flow channel is formed between the second liquid inlet and the second liquid outlet. The BDD electrocatalytic oxidation reactor is used to electrocatalytically oxidize and remove the remaining soluble oil in the battery waste water in the second flow channel.

2. The battery waste water recycling and treatment system according to claim 1 is characterized in that: The flow rate of the battery waste water in the first flow channel is between 1m / s and 5m / s; and / or, the battery waste water recovery and treatment system also includes a second pump, which is arranged between the second liquid inlet and the first liquid outlet, so that the flow rate of the battery waste water flowing through the second flow channel is between 2m / s and 8m / s.

3. The battery waste water recycling and treatment system according to claim 1, characterized in that: The battery waste water recycling and treatment system also includes: The adding device is provided with a third liquid inlet, an adding port and a third liquid outlet, wherein the third liquid inlet is for battery waste water to enter, the adding port is used for adding an activator, and the first pump is arranged between the third liquid outlet and the first liquid inlet; The oil-water separator is provided with an input port, which is communicated with the first liquid 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 communicated with the second liquid inlet.

4. The battery waste water recycling and treatment system according to claim 1, characterized in that: The electrolytic flotation device comprises: A first shell is formed with a first electrolytic chamber; Two first conductive plates are arranged side by side in the first electrolysis chamber; A plurality of first anode plates and a plurality of first cathode plates are alternately arranged between two of the 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, and the first conductive plates, the first anode plates and the first cathode plates enclose each other to form the first flow channel.

5. The battery waste water recycling and treatment system according to claim 4 is characterized in that: The current density of the electrolytic flotation device is 50A / m 2 Up to 200A / m 2 and / or, the spacing between adjacent first anode plates and first cathode plates is between 0.5 cm and 3 cm.

6. The battery waste water recycling and treatment system according to claim 4, characterized in that: The first anode plate is at least one of a graphite plate, an iridium plate, a lead dioxide plate, and a BDD plate, and the first cathode plate is at least one of a graphite plate, a stainless steel plate, and a titanium plate.

7. The battery waste water recycling and treatment system according to claim 1, characterized in that: The BDD electrocatalytic oxidation reactor comprises: A second shell is formed with a second electrolytic chamber; Two second conductive plates are arranged side by side in the second electrolysis chamber; A plurality of second anode plates and a plurality of second cathode plates are alternately arranged between two of the 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, and the second conductive plates, the second anode plates and the second cathode plates enclose each other to form the second flow channel.

8. The battery waste water recycling and treatment system according to claim 7, characterized in that: The BDD electrocatalytic oxidation reactor operates at a current density of 200 A / m 2 Up to 800A / m 2 and / or, the spacing between adjacent second anode plates and second cathode plates is between 0.2 cm and 10 cm.

9. The battery waste water recycling and treatment system according to claim 7, 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.

10. A method for recycling battery wastewater, based on the battery wastewater recycling system according to any one of claims 1 to 9, characterized in that: include: adding an activator to the battery wastewater; The battery waste water mixed with the activator is pumped into the first flow channel of the electrolytic flotation device, and the electrolytic flotation device performs an electrochemical reaction on the battery waste water to convert the emulsified oil, colloidal oil and part of the soluble oil in the battery waste water into insoluble oil droplets, and removes part of the soluble oil by electrocatalytic oxidation, and at the same time, the water is electrolyzed to generate gas, and the gas forms micro-nano bubbles under the flow of the battery waste water at a flow rate within a preset range, so that the insoluble oil droplets are removed by flotation; The battery wastewater after the floating oil is removed is input into the second flow channel of the BDD electrocatalytic oxidation reactor, and the BDD electrocatalytic oxidation reactor removes the remaining soluble oil in the battery wastewater by electrocatalytic oxidation.

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