Electrode sewage treatment electrolysis device

Abstract

The invention provides an electrode sewage treatment electrolysis device, the electrode sewage treatment electrolysis device comprises a reaction unit, the reaction unit comprises a sheet-shaped anode and a sheet-shaped cathode which are arranged at an interval, the anode and the cathode are sealed through a sealing gasket and a spacer, and a liquid chamber is formed; the anode comprises a current-conducting plate, and a silicon-based BDD electrode is bonded on the surface of at least one side of the current-conducting plate. The titanium-based conductive plate and the silicon-based BDD electrode are bonded, mechanical strength is provided for the brittle silicon-based BDD electrode, and the problems that the silicon-based electrode is prone to brittle fracture and easy to damage during assembly are thoroughly solved.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and more specifically, to an electrode-based wastewater treatment electrolysis device. Background Technology

[0002] Electrochemical oxidation technology has become one of the core technologies for treating organic wastewater due to its advantages such as no secondary pollution, strong oxidation capacity, and simple operation. Among them, boron-doped diamond (BDD) electrodes, with their ultra-high oxidation potential, excellent physicochemical stability, and non-selective degradation characteristics of organic pollutants, have become ideal anode materials for electrochemical oxidation treatment of recalcitrant wastewater. Silicon exhibits excellent chemical inertness in strong acids, strong bases, and organic solvents. Using it as the matrix for BDD electrodes can maintain the excellent performance of the electrodes while bringing great potential for cost reduction and structural innovation.

[0003] However, compared to traditional niobium metal substrates, silicon is a brittle material with poor mechanical strength and toughness. During reactor assembly and operation, or when subjected to external impacts, silicon-based BDD electrodes are more prone to brittle fracture, while metal substrates can withstand certain deformations and have better toughness. This necessitates more careful structural design and installation protection for silicon-based BDD electrodes in industrial environments where they need to withstand significant mechanical stress or vibration. Patent application number 202311746261.3 discloses a method for preparing gradient titanium-based boron-doped diamond thin film electrodes. This method uses chemical vapor deposition to deposit boron-doped diamond films onto the surface of a Ti / TiC nanotube gradient substrate, resulting in gradient titanium-based boron-doped diamond thin film electrodes. This reduces the problem of poor bonding caused by the thermal expansion coefficients and lattice mismatch of the phases, significantly improving the service life of the titanium-based boron-doped diamond thin film electrodes. However, this method is complex to operate, costly, and the electrode area obtained is limited, making it unsuitable for wastewater treatment.

[0004] Furthermore, the silicon used for depositing BDD thin films is typically highly doped n-type or p-type silicon. While this meets basic conductivity requirements, its conductivity is still far inferior to that of metals. Moreover, the semiconductor nature of the silicon substrate introduces unnecessary contact resistance. Under high current density operating conditions, the substrate's own resistance generates additional Joule heat, resulting in energy loss in the device. Patent application number 202511446530.3 discloses a silicon-based BDD electrode plate and its preparation method, reactor module, and electrochemical reactor. It employs a composite connection structure consisting of a slotted aluminum plate and conductive silver paste + copper foil to reduce contact resistance; however, it lacks sufficient mechanical support, making the electrode plate susceptible to vibration / stress and resulting in poor long-term stability.

[0005] Therefore, there is an urgent need for an electrochemical reaction device that is simple in structure, has good mechanical stability, and is suitable for large-scale wastewater treatment systems. Summary of the Invention

[0006] In view of this, the present invention aims to provide a wastewater treatment electrolysis device with a simple structure, adaptability to large-scale wastewater treatment, high strength, and long service life, so as to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0008] The present invention provides an electrode wastewater treatment electrolysis device, comprising a reaction unit, wherein the reaction unit includes an anode and a cathode that are plate-shaped and spaced apart, and the anode and the cathode are sealed and form a liquid chamber by a sealing gasket and a spacer; the anode includes a conductive plate, and a silicon-based BDD electrode is bonded to at least one side of the conductive plate.

[0009] This invention bonds silicon-based BDD electrodes to a conductive plate, providing comprehensive mechanical support and protection for the brittle silicon-based BDD electrodes. Structurally, it completely overcomes the core defect of silicon-based electrodes being prone to brittle fracture, meeting the mechanical stress and vibration requirements of industrial environments. In addition, this design can significantly reduce the contact resistance and Joule heating caused by the semiconductor characteristics of silicon substrates, reducing energy loss.

[0010] Furthermore, the conductive plate is made of titanium, and the silicon-based BDD electrode is a silicon-based BDD electrode with a diamond conductive layer deposited on one side; the side of the silicon-based BDD electrode without the diamond conductive layer deposited is bonded and fixed to the conductive plate with conductive adhesive, and the conductive adhesive is coated with sealant around its perimeter to prevent the medium from contacting the conductive adhesive.

[0011] This invention uses an adhesive bonding method to avoid the impact of mechanical fixing on brittle silicon wafers. At the same time, a sealant is coated around the conductive adhesive to form a physical isolation barrier, which effectively prevents corrosion and aging caused by contact between the water treatment medium and the conductive adhesive, and extends the service life of the electrolysis device.

[0012] Furthermore, when multiple silicon-based BDD electrodes are bonded to the same side of the conductive plate, all multiple silicon-based BDD electrodes on the same side are attached to the surface of the conductive plate and the spacing between adjacent silicon-based BDD electrodes is no greater than 5 mm.

[0013] This setup allows the titanium plate to evenly distribute the supporting force on multiple brittle silicon-based electrodes, preventing localized stress concentration that could lead to silicon wafer breakage. It also ensures the uniformity of the dielectric flow through each electrode area, thereby improving overall reaction efficiency.

[0014] Furthermore, when a silicon-based BDD electrode is bonded to one side of the conductive plate, the electrode wastewater treatment electrolysis device is provided with a cathode, a spacer, a sealing gasket, and an anode in sequence along the thickness direction. A sealing gasket and an end plate are provided on the side of the cathode away from the anode and the side of the anode away from the cathode for sealing the medium.

[0015] Furthermore, when silicon-based BDD electrodes are bonded to both sides of the conductive plate, the reaction unit includes two cathodes and one anode, and the two cathodes are respectively arranged at intervals on both sides of the anode; when there are two or more reaction units in the electrode wastewater treatment electrolysis device, adjacent reaction units share a cathode.

[0016] The electrode wastewater treatment electrolysis device designed in this invention includes an integrated reaction unit consisting of an anode, a cathode, a spacer, and a sealing gasket. The number of reaction units can be flexibly expanded to meet the needs of large-scale engineering water treatment.

[0017] Furthermore, the electrode wastewater treatment electrolysis device also includes end plates disposed at both ends of the reaction unit, and a sealing gasket is provided between the outermost cathode and the end plate for sealing the medium.

[0018] In a preferred embodiment of the present invention, the end plate includes an inlet end plate and an outlet end plate. A medium inlet is provided on the lower side of the inlet end plate, and a medium outlet is provided on the upper side of the outlet end plate. The sealing gasket, cathode, spacer, and anode are all provided with medium inflow channels on their lower sides and medium outflow channels on their upper sides. The medium inflow channels are connected to the medium inlet of the inlet end plate, and the medium outflow channels are connected to the medium outlet of the outlet end plate, thereby forming a medium inflow or outflow passage.

[0019] This invention provides a medium inlet and a medium outlet on the inlet end plate and the outlet end plate, which, together with the medium channels of each component, form a flow path from bottom to top. By utilizing the gravity of the medium itself and the buoyancy of the gas generated by electrolysis, the medium can achieve sufficient residence and turbulent flow in the reaction chamber, thereby increasing the probability of contact between organic matter and the electrode and enhancing the degradation effect.

[0020] Furthermore, the anode and the sealing gasket are fitted together, and a spacer is provided on the side of the sealing gasket near the cathode; both the sealing gasket and the spacer have a hollow structure in the center, and the hollow structure in the sealing gasket and the spacer, together with the adjacent anode and cathode, form a liquid chamber for containing and reacting with the liquid medium.

[0021] Furthermore, the spacer and the sealing gasket are made of elastic material, and the hollow structure in the center of the spacer extends along the edge to form a medium inflow hole and / or a medium outflow hole.

[0022] In a preferred embodiment of the present invention, the medium inflow hole and / or medium outflow hole formed by the edge of the hollow structure in the center of the spacer are provided with a notch on the side facing the electrode to guide the flow of the medium.

[0023] This invention creates notches in the channels formed by the hollowed-out edges inside the spacer, dispersing the concentrated medium flow into multiple uniform fine streams that are guided to the electrode surface. This achieves uniform water distribution of the medium in the reaction chamber, ensuring consistent reaction conditions in all areas of the electrode surface and avoiding uneven degradation caused by excessively high or low local medium concentrations. At the same time, the flow guidance of the notches can promote the rapid reaction between hydroxyl radicals and organic matter, improving degradation efficiency.

[0024] Furthermore, the sealing gasket, cathode, spacer and anode plates are provided with mounting holes, and fasteners are inserted into the mounting holes for overall clamping and stress buffering.

[0025] The spacers and gaskets made of elastic material have good compression resilience. When the fasteners are tightened as a whole, they can fully fit the surface of each component to achieve a double seal. This ensures that the reaction chamber is sealed and leak-proof, and also isolates the inside of the reactor from the outside to prevent liquid media leakage.

[0026] Furthermore, the sealing gasket, cathode, spacer, and anode are provided with mounting and positioning holes at the four corners of the plate to assist in installation.

[0027] In a preferred embodiment of the present invention, the end plate, sealing gasket, cathode, spacer and anode are all provided with mounting holes and mounting positioning holes, and the mounting holes and mounting positioning holes are positioned in correspondence on each component to ensure that each component can be precisely aligned during assembly.

[0028] Furthermore, the cathode is made of one of titanium, titanium alloy, nickel-based alloy or stainless steel; the cathode plate has a power connection hole on its edge for connecting the negative terminal of an external DC power supply.

[0029] Compared with existing technologies, the electrode wastewater treatment electrolysis device of the present invention has the following advantages:

[0030] This invention bonds a titanium-based conductive plate to a silicon-based BDD electrode using conductive adhesive. The titanium plate provides mechanical support and current conduction, giving the brittle silicon-based BDD electrode mechanical strength and completely solving the problems of easy fracture and assembly damage associated with silicon-based electrodes. Simultaneously, the cathode, spacer, and anode form a repeatable reaction unit, which can be flexibly configured according to the volume of water to be treated, making it suitable for everything from small-scale laboratory experiments to large-scale industrial production, demonstrating strong practicality. Attached Figure Description

[0031] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1This is an exploded view of the wastewater treatment electrolysis device with silicon-based BDD electrodes bonded on both sides according to the present invention.

[0033] Figure 2 This is an exploded view of the wastewater treatment electrolysis device with a single-sided bonded silicon-based BDD electrode according to the present invention;

[0034] Figure 3 This is a schematic diagram of the conductive adhesive region and the sealant region on the anode surface of the present invention;

[0035] Figure 4 This is a schematic diagram of multiple silicon-based BDD electrodes bonded to one side of a conductive plate according to the present invention;

[0036] Figure 5 This is an exploded view of the electrode wastewater treatment electrolysis device comprising a reaction unit according to the present invention;

[0037] Figure 6 This is a schematic diagram of the medium inlet hole and medium outlet hole of the anode described in this invention;

[0038] Figure 7 This is a schematic diagram of the medium inlet hole and medium outlet hole of the spacer described in this invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. End plate; 1-1. Inlet end plate; 1-2. Outlet end plate; 2. Sealing gasket; 2-1. Cathode sealing gasket; 2-2. Anode sealing gasket; 3. Cathode; 4. Spacer; 5. Anode; 5-1. Conductive plate; 5-2. Silicon-based BDD electrode; 5-3. Conductive adhesive area; 5-4. Sealing adhesive area; 5-5. Anode connection hole; 6. Fasteners; 6-1. Fastening bolts; 6-2. Insulating sleeve; 7. Mounting and fixing holes; 8. Mounting and positioning holes; 9. Reaction unit. Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments. First, it should be noted that the data in the following experimental examples were obtained by the inventors through numerous experiments. Due to space limitations, only a portion of these data is shown in the specification, and those skilled in the art can understand and implement the present invention based on this data. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art can make various modifications or alterations to the invention, and these modifications or alterations also fall within the scope of protection of this application.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0043] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] Silicon is a brittle material with poor mechanical strength and toughness. Silicon-based electrodes are more prone to brittle fracture during reactor assembly, operation, or impact. To avoid these drawbacks, existing silicon-based BDD electrochemical reactors are difficult to scale up, typically employing simple single-chamber or double-chamber reactors, and silicon breakage frequently occurs during assembly.

[0045] like Figures 1-2 As shown, this embodiment provides an electrode wastewater treatment electrolysis device, including a reaction unit 9. The reaction unit 9 includes an anode 5 and a cathode 3 that are plate-shaped and spaced apart. The anode 5 and the cathode 3 are sealed together by a sealing gasket 2 and a spacer 4 to form a liquid chamber. The anode 5 includes a conductive plate 5-1, and a silicon-based BDD electrode 5-2 is bonded to at least one side of the conductive plate 5-1.

[0046] In this invention, the conductive plate provides stable mechanical support for the silicon-based BDD electrode, disperses assembly stress and vibration stress under industrial conditions, completely solves the problems of easy breakage and high assembly failure rate of silicon-based electrodes, and significantly improves service life.

[0047] In this embodiment, the conductive plate 5-1 is made of titanium, and the silicon-based BDD electrode 5-2 is a silicon-based BDD electrode with a diamond conductive layer deposited on one side. The side of the silicon-based BDD electrode 5-2 without the diamond conductive layer deposited is bonded and fixed to the conductive plate 5-1 with conductive adhesive. The conductive adhesive is coated with sealant around its perimeter to prevent the medium from contacting the conductive adhesive.

[0048] In this invention, the silicon-based BDD electrode with a single-sided deposited diamond conductive layer uses conductive polycrystalline silicon as a substrate, and a diamond conductive layer is deposited on one side of the substrate. The specific preparation method is existing technology, and will not be described in detail here.

[0049] This invention attaches a silicon-based BDD electrode with a single-sided deposited diamond conductive layer to a titanium plate. The current is directly distributed to each silicon-based BDD electrode through the titanium plate, thus avoiding the conductivity bottleneck of silicon-based semiconductors.

[0050] like Figure 2 As shown, in one embodiment of the present invention, when a silicon-based BDD electrode 5-2 is bonded to one side of the conductive plate 5-1, the electrode wastewater treatment electrolysis device is provided with a cathode 3, a spacer 4, a sealing gasket 2 and an anode 5 in sequence along the thickness direction. A sealing gasket 2 and an end plate 1 are provided on the side of the cathode 3 away from the anode 5 and the side of the anode 5 away from the cathode 3, for sealing the medium.

[0051] Silicon-based materials are inherently brittle and have weak impact and deformation resistance. In single-sided bonding, the conductive plate is only constrained by the silicon-based BDD electrode on one side, and the electrochemical reaction occurs only on one side. This easily leads to stress fatigue at the bonding interface and can even cause brittle cracking of the silicon-based BDD electrode. Furthermore, the Joule heat generated by the single-sided electrochemical reaction and the localized temperature changes in the dielectric reaction create thermal stress on that side of the conductive plate. Asymmetric thermal expansion and contraction can cause slight warping of the conductive plate, further stretching the silicon-based BDD electrode and increasing the risk of electrode cracking and film peeling. Therefore, single-sided bonding is suitable for low-volume and low-load applications.

[0052] like Figure 3 As shown, in one embodiment of the present invention, when silicon-based BDD electrodes 5-2 are bonded to both sides of the conductive plate 5-1, the reaction unit 9 includes two cathodes 3 and one anode 5, and the two cathodes 3 are respectively arranged at intervals on both sides of the anode 5; when two or more reaction units 9 are provided in the electrode wastewater treatment electrolysis device, adjacent reaction units 9 share a cathode 3.

[0053] Compared to single-sided bonding, after double-sided bonding of silicon-based BDD electrodes, a single anode can simultaneously form two independent electrolytic reaction surfaces with the cathodes on both sides. The degradation efficiency of organic pollutants per unit time is directly increased to 1.9 to 2.0 times that of the original single-sided structure. Furthermore, the uniform reaction load on both sides ensures that the wear of the silicon-based BDD electrode is synchronized, avoiding excessive local wear and reducing the risk of stress cracking. The overall service life is extended by 10% to 15% compared to single-sided bonding.

[0054] It should be noted that, as Figure 3 As shown, the area coated with conductive adhesive forms conductive adhesive area 5-3, and the area coated with sealant forms sealant area 5-4. This arrangement is to prevent sewage from corroding the conductive adhesive, directly damaging the circuit, and causing partial power outages / short circuits.

[0055] In a preferred embodiment, the conductive adhesive is one or more of conductive silicone, conductive silver paste, and conductive copper paste; the sealant is one or more of epoxy sealant, silicone sealant, and fluoropolymer sealant.

[0056] like Figure 4 As shown, when multiple silicon-based BDD electrodes 5-2 are bonded to at least one side of the conductive plate 5-1, the multiple silicon-based BDD electrodes 5-2 are all attached to the surface of the conductive plate 5-1 and the spacing between adjacent silicon-based BDD electrodes 5-2 is no more than 5 mm, which is used to expand the reaction area and ensure that the supporting force is evenly distributed.

[0057] It should be noted that one or more silicon-based BDD electrodes can be bonded to each side of the conductive plate. This configuration expands the area of ​​the silicon-based BDD electrodes on the titanium plate to suit larger-scale engineering applications; at the same time, the operation is simple, as the silicon-based BDD electrodes can be bonded to the conductive plate, and the resulting anode meets both strength and electrochemical performance requirements.

[0058] In a preferred embodiment, the thickness of the conductive plate 5-1 is 3-5 mm; the thickness of the silicon-based BDD electrode 5-2 is 3-5 mm.

[0059] like Figure 3 As shown, in a preferred embodiment, the conductive plate 5-1 is provided with an anode contact hole 5-5 in the direction away from the silicon-based BDD electrode 5-2 for connecting to an external DC power supply.

[0060] It should be noted that the silicon-based BDD electrode and the conductive plate together serve as the anode, connected to the positive terminal of the external DC power supply, while the cathode is connected to the negative terminal of the external DC power supply. The ultra-high oxidation potential of the silicon-based BDD electrode can efficiently generate non-selective hydroxyl radicals, which can completely mineralize stubborn organic pollutants (such as antibiotics, dyes, and intermediates) in pharmaceutical wastewater, chemical wastewater, and landfill leachate into carbon dioxide, water, and inorganic salts, thus avoiding secondary pollution.

[0061] In this embodiment, the electrode wastewater treatment electrolysis device further includes end plates 1 disposed at both ends of the reaction unit 9, and a sealing gasket 2 is provided between the outermost cathode 3 and the end plate 1 for sealing the medium.

[0062] like Figure 5 As shown, in one embodiment of the present invention, the end plate 1, sealing gasket 2, cathode 3, spacer 4 and anode 5 are provided with mounting holes 7, and fasteners 6 are inserted into the mounting holes 7 for overall clamping and stress buffering.

[0063] In a preferred embodiment, the diameter of the mounting holes 7 on the cathode 3 and anode 5 is larger than the diameter of the mounting holes 7 on the end plate 1, sealing gasket 2 and spacer 4; the fastener 6 includes a fastening bolt 6-1 and an insulating sleeve 6-2, the fastening bolt 6-1 is fitted into the insulating sleeve 6-2 and inserted into the mounting hole 7 through the end plate 1 to prevent short circuit between electrodes.

[0064] In one embodiment of the present invention, mounting and positioning holes 8 are provided at the four corners of the end plate 1, sealing gasket 2, cathode 3, spacer 4 and anode 5 for assisting installation.

[0065] In one embodiment of the present invention, the sealing gasket 2 includes a cathode sealing gasket 2-1 and an anode sealing gasket 2-2. The cathode sealing gasket 2-1 is located between the reaction unit 9 and the end plate 1 or an adjacent reaction unit 9, and the anode sealing gasket 2-2 is located between the cathode 3 and the anode 5.

[0066] It should be noted that the reaction unit 9 is reproducible and includes a cathode 3, a spacer 4, an anode sealing gasket 2-2 and an anode 5 stacked in sequence. The cathode 3, the spacer 4 and the anode sealing gasket 2-2 are arranged in two groups and symmetrically on both sides of the anode 5. The cathode sealing gasket 2-1 is located between the cathode 3 and the end plate 1 or an adjacent cathode 3.

[0067] In one embodiment of the present invention, the end plate 1 includes an inlet end plate 1-1 and an outlet end plate 1-2. The inlet end plate 1-1 has a medium inlet on its lower side, and the outlet end plate 1-2 has a medium outlet on its upper side. The cathode sealing gasket 2-1, cathode 3, spacer 4, anode sealing gasket 2-2, and anode 5 are all provided with medium inflow holes on their lower sides and medium outflow holes on their upper sides. The medium inflow holes are connected to the medium inlet of the inlet end plate 1-1, and the medium outflow holes are connected to the medium outlet of the outlet end plate 1-2, for forming a medium inflow or outflow passage.

[0068] Taking anode 5 as an example, such as Figure 6 As shown, elongated medium outflow holes and medium inflow holes are respectively provided on the upper and lower sides of the anode 5. Corresponding medium inflow holes and medium outflow holes are provided at the same positions on the cathode sealing gasket 2-1, cathode 3, spacer 4, and anode sealing gasket 2-2.

[0069] It should be noted that several sets of end plates 1, sealing gaskets 2, cathodes 3, spacers 4, and anodes 5 are stacked together in a certain order. To ensure accurate positioning, positioning pins are used to position the components through the mounting positioning holes 8 during assembly. After positioning, the fastening bolts 6-1 are inserted into the insulating sleeves 6-2 and then sequentially inserted into the mounting fixing holes 7 in the end plates 1, sealing gaskets 2, cathodes 3, spacers 4, and anodes 5, and tightened with nuts or screws.

[0070] In the electrode wastewater treatment electrolysis device of the present invention, an electrode catalytic oxidation reaction occurs under the drive of an external electric field; the medium flows in from the inlet of the device, and flows evenly into the chambers formed by the anode and cathode through the medium inflow channels formed by each component, where an electrochemical reaction occurs; the treated medium and the generated gas in each anode and cathode chamber are collected into the medium outflow channels formed by each component, and flow out through the reactor device.

[0071] like Figures 1-6As shown, in this embodiment, sealing gaskets 2 are attached to both sides of the anode 5, and a spacer 4 is provided on the side of the sealing gasket 2 near the cathode 3. Both the sealing gasket 2 and the spacer 4 have a hollow structure in their center. The hollow structure in the sealing gasket 2 and the spacer 4, together with the adjacent anode 5 and cathode 3, forms a liquid chamber for containing and reacting with the liquid medium. The spacer 4 and the sealing gasket 2 are made of elastic material, and the edge of the hollow structure in the center of the spacer 4 extends to form a medium inflow hole and / or a medium outflow hole. The medium inflow hole and / or the medium outflow hole has a notch on the side facing the electrode to guide the flow of the medium.

[0072] The spacer of this invention has an opening in the channel facing the electrode, ensuring uniformity of medium inflow and outflow, allowing the medium to flow evenly across the electrode. Furthermore, the spacer can be of different thicknesses to meet the needs of different processed media.

[0073] like Figure 7 As shown, in a preferred embodiment of the present invention, the hollow structure at the center of the spacer 4 forms separate and identical small hole structures for the inflow and / or outflow of the medium.

[0074] This design ensures the consistency of the inflow and outflow channel dimensions, thereby guaranteeing the uniformity of water flow in each chamber.

[0075] In a preferred embodiment of the present invention, the elastic material is preferably fluororubber or EPDM rubber, which is both corrosion-resistant and has a sealing function. Its main function is to isolate the internal and external spaces of the electrochemical reaction device and prevent leakage of the medium.

[0076] In one embodiment of the present invention, the cathode 3 is made of one of titanium, titanium alloy, nickel-based alloy or stainless steel; the cathode 3 has an electrical connection hole on its plate edge for connecting the negative terminal of an external DC power supply.

[0077] In this invention, the cathode is made of titanium or titanium alloy, which can balance corrosion resistance and cost control requirements; when nickel-based alloy is used, the electrocatalytic activity of nickel can significantly reduce the overpotential of hydrogen evolution at the cathode, thereby reducing the energy consumption of the device; when stainless steel is used, the overall manufacturing cost of the device can be effectively reduced; the cathode plate is provided with a power connection hole, which is connected to the negative terminal of the DC power supply through a wire when the electrochemical reactor is working, so as to form a stable electrolysis circuit.

[0078] In one embodiment of the present invention, the end plate 1 is made of polypropylene or epoxy fiberglass, and its main function is to support and protect the entire electrolysis reaction device, thus requiring a high-strength material. Additionally, the end plate 1 also provides the electrolysis reaction device with a medium inlet and a medium outlet for communication with the outside world.

[0079] In one embodiment of the present invention, the outer contour dimensions of the sealing gasket 2, cathode 3, spacer 4 and anode 5 are equal and smaller than the outer contour dimensions of the end plate 1. The assembled electrochemical reactor is placed on a plane, with only the end plate 1 in contact with the plane, thus avoiding contact between the charged electrode plates and the outside world and eliminating the possibility of forming an external short circuit between the anode and cathode.

[0080] Example 1

[0081] like Figure 5 As shown, the electrode wastewater treatment electrolysis device:

[0082] End plate 1 includes inlet end plate 1-1 and outlet end plate 1-2, both of which are made of PP material.

[0083] Two cathode sealing gaskets 2-1, made of EPDM material, with a thickness of 3mm.

[0084] Two cathodes, 3, are made of nickel-based alloy and are 3mm thick.

[0085] Two spacers 4, each 3mm thick, are used to separate the cathode 3 and the anode 5 by a distance of 3mm.

[0086] Two anode sealing gaskets 2-2, made of EPDM material, with a thickness of 3mm.

[0087] One anode 5, wherein the conductive plate 5-1 is a titanium plate with a thickness of 3mm, the silicon-based BDD electrode 5-2 has a thickness of 3mm and a single-sided coating, the two silicon-based BDD electrodes 5-2 are respectively bonded to both sides of the conductive plate 5-1 with conductive silver paste, and the outside of the conductive silver paste is encapsulated with epoxy glue. After assembly, the anode 5 is obtained, and the thickness of the anode 5 is 9mm.

[0088] 12 sets of fastening bolts 6-1 and insulating sleeves 6-2. Fastening bolts 6-1 are made of SS316 material, and insulating sleeves 6-2 are made of PTFE material.

[0089] Test Example 1

[0090] Wastewater treatment effect:

[0091] For chemical intermediate wastewater with an influent COD concentration of 800~1500 mg / L, the wastewater enters from the medium inlet at the bottom of the unit at a flow rate of 50 L / h through the inlet end plate 1-1. Under the action of an external DC current (current density controlled at 30 mA / cm²), the wastewater is evenly distributed to the electrolysis reaction chamber through the channels, making full contact with the cathode 3 and anode 5. The treatment time for a single batch of wastewater is 60~90 min (i.e., the effective reaction time of the wastewater in the electrolysis reaction chamber). The organic pollutants in the wastewater are efficiently oxidized, decomposed, and completely mineralized into carbon dioxide. The process involves the reaction of carbon dioxide, water, and inorganic salts without generating intermediate pollutants. Organic pollutant removal rates can reach over 95%, resulting in a stable effluent COD concentration below 80 mg / L. The concentration of recalcitrant organic pollutants (such as aromatic compounds and antibiotics) is reduced to below 5 mg / L, meeting the Class A discharge standard of the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB18918-2002). If used for industrial reuse, the effluent COD can be further reduced to below 50 mg / L after simple filtration, meeting the requirements for industrial circulating water reuse. The treated water is discharged through media outlets 1-2 on the upper outlet plate of the device, allowing for direct municipal discharge or workshop recycling, achieving wastewater reduction, harmlessness, and resource recovery.

[0092] Test Example 2

[0093] Mechanical strength test:

[0094] The electrolysis device using this technical solution was subjected to simulated industrial equipment vibration (vibration frequency 50Hz, amplitude 0.5mm) in the laboratory for 24 hours. After 24 hours of continuous vibration, the anode structure remained intact, the bonding was not loose, and there was no electrode peeling. When an impact load (impact energy 10J) was applied, there was no breakage after continuous impact, and the bonding between the electrode and the titanium plate was normal, indicating that it could be used normally.

[0095] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An electrode wastewater treatment electrolysis device, comprising a reaction unit (9), characterized in that, The reaction unit (9) includes a sheet-shaped anode (5) and a cathode (3) spaced apart. The anode (5) and the cathode (3) are sealed together by a sealing gasket (2) and a spacer (4) to form a liquid chamber. The anode (5) includes a conductive plate (5-1), and a silicon-based BDD electrode (5-2) is bonded to at least one side of the conductive plate (5-1).

2. The electrode wastewater treatment electrolysis device according to claim 1, characterized in that, The conductive plate (5-1) is made of titanium. The silicon-based BDD electrode (5-2) is a silicon-based BDD electrode with a diamond conductive layer deposited on one side. The side of the silicon-based BDD electrode (5-2) without the diamond conductive layer deposited is bonded and fixed to the conductive plate (5-1) with conductive adhesive. The conductive adhesive is coated with sealant around its perimeter to prevent the medium from contacting the conductive adhesive.

3. The electrode wastewater treatment electrolysis device according to claim 1, characterized in that, When a silicon-based BDD electrode (5-2) is bonded to one side of the conductive plate (5-1), the electrode wastewater treatment electrolysis device is provided with a cathode (3), a spacer (4), a sealing gasket (2) and an anode (5) in sequence along the thickness direction. A sealing gasket (2) and an end plate (1) are provided on the side of the cathode (3) away from the anode (5) and on the side of the anode (5) away from the cathode (3) for sealing the medium.

4. The electrode wastewater treatment electrolysis device according to claim 1, characterized in that, When both sides of the conductive plate (5-1) are bonded with silicon-based BDD electrodes (5-2), the reaction unit (9) includes two cathodes (3) and one anode (5), and the two cathodes (3) are respectively arranged at intervals on both sides of the anode (5); when there are two or more reaction units (9) in the electrode wastewater treatment electrolysis device, adjacent reaction units (9) share a cathode (3).

5. The electrode wastewater treatment electrolysis device according to claim 4, characterized in that, The electrode wastewater treatment electrolysis device also includes end plates (1) disposed at both ends of the reaction unit (9), and a sealing gasket (2) is provided between the outermost cathode (3) and the end plate (1) for sealing the medium.

6. The electrode wastewater treatment electrolysis device according to claim 1, characterized in that, The anode (5) and the sealing gasket (2) are fitted together, and a spacer (4) is provided on the side of the sealing gasket (2) near the cathode (3); a hollow structure is provided in the center of both the sealing gasket (2) and the spacer (4), and the hollow structure in the sealing gasket (2) and the spacer (4) together with the adjacent anode (5) and cathode (3) form a liquid chamber for containing and reacting liquid media.

7. The electrode wastewater treatment electrolysis device according to claim 6, characterized in that, The spacer (4) and the sealing gasket (2) are made of elastic material, and the hollow structure in the center of the spacer (4) extends to form a medium inflow hole and / or a medium outflow hole.

8. The electrode wastewater treatment electrolysis device according to claim 1, characterized in that, The sealing gasket (2), cathode (3), spacer (4) and anode (5) are provided with mounting holes (7), and fasteners (6) are inserted into the mounting holes (7) for overall compression and stress buffering.

9. The electrode wastewater treatment electrolysis device according to claim 1, characterized in that, The sealing gasket (2), cathode (3), spacer (4) and anode (5) are provided with mounting positioning holes (8) at the four corners of the plate for auxiliary installation.

10. The electrode wastewater treatment electrolysis device according to claim 1, characterized in that, The cathode (3) is made of one of titanium, titanium alloy, nickel-based alloy or stainless steel; the cathode (3) has an electrical connection hole on the edge of the plate for connecting the negative electrode of an external DC power supply.

Images