Electrolytic assembly and water treatment system based on BDD electrodes

Abstract

The present invention provides an electrolysis assembly based on a BDD electrode, the electrolysis assembly including a water flow guiding module and an electrolysis module installed in the water flow guiding module, the electrolysis module including a BDD electrode, the BDD electrode including a body and a plurality of branches installed on both sides of the body, the body and the branches forming a fishbone structure. The BDD electrode of the electrolysis assembly of the present invention has a fishbone structure, and gas generated during electrolysis is less likely to clog the holes than the conventional orifice plate electrode structure, and the gas can be easily pushed out and discharged by the cooperation of the water flow guiding module, thereby realizing efficient discharge of gas products, reducing the probability of clogging by particulate matter, ensuring an effective electrolysis reaction area, and improving electrolysis efficiency and water treatment efficiency. The present invention further provides a water treatment system including the electrolysis assembly, which cooperates with a filter assembly and a gas-liquid mixing assembly to effectively improve the treatment effect.

Description

[Technical Field]

[0001] The present invention relates to the technical field of electrochemistry, and in particular to electrolysis assemblies and water treatment systems based on BDD electrodes. [Background technology]

[0002] Boron-doped diamond (BDD) electrodes are fabricated by depositing a boron-doped diamond film on a substrate using vapor deposition. When a BDD electrode is electrolyzed in water after passing a current through it, the active ingredients generated are ozone and hydroxyl radicals, which can oxidize viruses, bacteria, organic pollutants, etc. BDD electrodes have advantages such as a high oxygen evolution potential and high electrocatalytic activity. They also have excellent chemical stability, and can withstand electrode wear caused by electrochemical corrosion during long-term electrolysis. They are widely used in disinfection and sterilization, as well as water treatment, in devices such as spray pots, humidifiers, vegetable washers, washing machines, air purifiers, water purifiers, deodorizers, and sewage treatment plants.

[0003] However, conventional BDD electrode technology has the following problems.

[0004] 1. The structural form of conventional BDD electrodes is two-dimensional and flat. They generally use processing methods such as sandblasting, laser drilling and cutting, water jetting, and chemical etching to process the surface and structural form, thereby increasing the surface area and improving reaction efficiency. However, these processing methods are prone to processing stress (e.g., processing stress caused by laser drilling and cutting), which affects the mechanical strength and reduces the processing efficiency.

[0005] 2. The commonly used electrode structure of two-dimensional planar BDD electrodes is generally a simple flat plate or orifice plate (see Figure 1), and when applied, the water flow direction is perpendicular to the exhaust direction (see Figure 2). This makes it difficult for hydrogen gas and ozone generated during the operation of the electrolysis assembly to be exhausted in a timely manner, reducing the effective operating area and hindering the efficient progress of the electrolysis reaction. Furthermore, if particulate matter is present in the treated water or impurities accumulate during the electrochemical reaction process, they are likely to clog the exhaust holes (or grooves), reducing the electrolysis efficiency. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides an electrolysis assembly and water treatment system based on a BDD electrode to solve problems such as the difficulty of timely discharge of gases such as hydrogen gas, ozone, and oxygen gas generated during electrolysis with conventional BDD electrodes, reducing the effective operating area and hindering the efficient progress of the electrolysis reaction. Furthermore, when particulate matter is contained in the treated water or impurities are deposited during the electrochemical reaction process, the exhaust hole (or groove) is easily clogged, reducing the electrolysis efficiency. [Means for solving the problem]

[0007] In one aspect, an electrolysis assembly based on a BDD electrode according to the present invention includes a water flow guiding module and an electrolysis module, the electrolysis module being disposed within the water flow guiding module, the electrolysis module including a BDD electrode, the BDD electrode including a main body and a plurality of branch portions disposed on both sides of the main body, the main body and the plurality of branch portions on both sides of the main body forming a fishbone-like structure.

[0008] Compared with the prior art, the present invention has the following advantageous effects: The BDD electrode of the present invention includes a main body and a plurality of branches disposed on both sides of the main body, and the main body and branches form a fishbone-like structure. Compared with the conventional orifice plate electrode structure, the fishbone-like structure eliminates dead ends in the side slits between adjacent branches, preventing gas generated during electrolysis from clogging the holes. The water flow guiding module cooperates to easily flush and discharge gas as the water flows through the electrolysis module, easily removing accumulated impurities, realizing efficient discharge of gas products, reducing the probability of clogging by particulate matter, ensuring an effective electrolysis reaction area, and improving electrolysis efficiency and water treatment efficiency.

[0009] In some embodiments of the present invention, the spacing between adjacent branches is 0.05 mm to 2.5 mm, the width of each branch is 0.05 mm to 10 mm, and the included angle between each branch and the main body toward the tail of the fishbone-like structure is 0 to 90°.

[0010] The above-mentioned additional technical measures have the following beneficial effects: all processing equipment has a certain specification, and the range of the distance between adjacent branches (i.e., the width of the side slits) is set according to the specification of the processing equipment to facilitate the processing of the fishbone-shaped structure; based on the design of the side slit width, the width range of each branch is 0.05 mm to 10 mm, which can ensure the reaction area when the BDD electrode and water in the electrolysis module come into contact, and can ensure the electrolysis efficiency while ensuring the strength of the BDD electrode; furthermore, this width range is advantageous for the discharge of gas generated during the electrolysis reaction; when the included angle between each branch and the main body toward the tail of the fishbone-shaped structure is designed to be 0 to 90°, it is advantageous for the gas generated in the side slits between adjacent branches to cooperate with the water flow and flow away during the electrolysis process.

[0011] In some embodiments of the present invention, the BDD electrode is manufactured by depositing a boron-doped diamond film on a fishbone-shaped substrate, the material of the substrate being one selected from titanium, niobium, tantalum, nickel, single crystal silicon, polycrystalline silicon, silicon carbide single crystal, silicon carbide ceramic, silicon nitride single crystal, and silicon nitride ceramic, and the substrate is processed by a diamond wire cutting method.

[0012] The above-mentioned additional technical measures have the following beneficial effects. The fishbone-shaped structure of the BDD electrode is derived from the fishbone-shaped structure of the substrate. By depositing a boron-doped diamond film on a fishbone-shaped substrate, a fishbone-shaped BDD electrode can be obtained. The substrate material is selected to be advantageous for the deposition of the boron-doped diamond film, making it less likely to fall off. Obtaining a fishbone-shaped structure by side-cutting the substrate of the BDD electrode using diamond wire cutting results in lower processing stress and higher substrate strength compared to conventional processing methods, such as laser drilling and cutting (which have a high-heat-affected zone due to laser, resulting in large residual stress due to thermal expansion issues and the likelihood of microcracks occurring around the processing location after processing). Tests have demonstrated that diamond wire cutting has the highest processing efficiency and can effectively improve processing efficiency.

[0013] In some embodiments of the present invention, the BDD electrodes include an anode BDD electrode and a cathode BDD electrode, and an ionic membrane is provided between the anode BDD electrode and the cathode BDD electrode.

[0014] The use of the above-mentioned additional technical means has the following beneficial effects. The ionic membrane, the BDD electrode serving as the anode, and the BDD electrode serving as the cathode form a BDD sandwich structure, constituting a single electrolytic cell. The ionic membrane has selective permeability to ions, allowing the passage of charged ions. The high-speed channel of the ionic membrane allows the hydrogen ions generated by the BDD electrode electrolyzing water to pass through the ionic membrane at high speed, thereby satisfying the requirements for electrolysis efficiency. The electrolysis efficiency is higher when an ionic membrane is provided than when electrolysis is achieved using only ions in water without the ionic membrane.

[0015] In some embodiments of the present invention, the water flow guide module includes a main water inlet guide pipe, a cavity communicating with the main water inlet guide pipe and having a side perpendicular to the main water inlet guide pipe, and a branch water inlet guide pipe communicating with the cavity and the main water inlet guide pipe and having an end communicating with the cavity perpendicular to the upper and lower surfaces of the cavity; the electrolysis module is installed in the cavity and is parallel to the upper and lower surfaces of the cavity; and the tail of the fishbone-shaped BDD electrode is away from the main water inlet guide pipe.

[0016] The above-mentioned additional technical measures have the following beneficial effects: the main inlet water guide pipe of the water flow guide module of the present invention controls the direction of the main water flow, and the branch inlet water guide pipes control the directions of the branch water flows. Because the side of the cavity is perpendicular to the main inlet water guide pipe, the direction of the main water flow is consistent with the direction from the neck to the tail of the fishbone-shaped BDD electrode. Because the connecting ends of the branch inlet water guide pipes and the cavity are perpendicular to the upper and lower sides of the cavity, the direction of the branch water flows is perpendicular to the fishbone-shaped BDD electrode. That is, the branch water flows sweep through the side slits between the adjacent branches, expelling gas in the side slits. The main water flow removes the swept-up gas, which further realizes the mutual cooperation between the electrolysis module including the fishbone-shaped BDD electrode and the water flow guide module, improving gas discharge efficiency and sediment discharge efficiency, ensuring an effective electrolysis reaction area, and ensuring electrolysis efficiency. Furthermore, the mutual cooperation between the electrolysis module including the fishbone-structured BDD electrode of the present invention and the water flow guide module increases the cooling efficiency of the water flow for the electrolysis module, thereby solving the problem of heat generation by the BDD electrode during the electrolysis process. This allows for a higher current density per unit area of ​​the electrode and higher electrolysis efficiency compared to conventional technologies.

[0017] In some embodiments of the present invention, the pipe diameter ratio between the branch water inlet guide pipe and the main water inlet guide pipe is 1:1 to 1:20.

[0018] The use of the above additional technical means has the following beneficial effects: In the present invention, by designing the pipe diameter ratio between the branch water inlet guide pipe and the main water inlet guide pipe to be 1:1 to 1:20, the magnitude of the water flow rate in the main branch passage can be effectively controlled, and the flow speed of each water flow can be further controlled, thereby realizing efficient gas discharge.

[0019] In some embodiments of the present invention, the water flow in the branched water inlet guide pipe is controlled by a switch having a pulse control characteristic.

[0020] The use of the above-mentioned additional technical means has the following beneficial effects: By providing a switch in the branch water inlet guide pipe, it is possible to control the opening and closing of the branch water flow and the magnitude of the water flow rate, and pulse control characteristics are realized by the switching frequency of the branch water inlet guide pipe, and the pulse water flow is more advantageous for the detachment and discharge of bubbles generated in the BDD electrode.

[0021] In some embodiments of the present invention, the end of the branched water inlet guide pipe that communicates with the cavity has a round pipe, duckbill or splitter structure.

[0022] The use of the above-mentioned additional technical measures has the following beneficial effects: the end of the branch water inlet guide pipe that communicates with the cavity can be designed in a round pipe, duckbill, or split-liquid structure, corresponding to the branch section of the fishbone structure, which is advantageous for the water flow introduced from the branch water inlet guide pipe to flush the side slits between two adjacent branches; in particular, the split-liquid structure, in which each branch pipe corresponds to one side slit, provides better slit flushing effect and higher gas discharge efficiency.

[0023] In another aspect, the present invention further relates to a water treatment system comprising the electrolysis assembly of any one of the preceding claims, and further comprising a filtration assembly and a gas-liquid mixing assembly, wherein the electrolysis assembly is positioned between the filtration assembly and the gas-liquid mixing assembly, and communicates with the filtration assembly via a water inlet passage and with the gas-liquid mixing assembly via a water outlet passage.

[0024] Compared with the prior art, the present invention has the following advantageous effects: The water treatment system of the present invention includes an electrolysis assembly, a filtration assembly, and a gas-liquid mixing assembly of the present invention. Before the water flow enters the electrolysis assembly, the filtration assembly pre-filters the water, filtering out some particles and suspended solids. When the electrolysis assembly performs electrolysis, these particles and suspended solids electrochemically aggregate to form large particles, preventing them from blocking the side slits between two adjacent branches. After the water flow passes through the electrolysis assembly, the gas-liquid mixing assembly mixes the water with the ozone generated by the electrolysis reaction, more thoroughly mixing the water with the ozone generated by the electrolysis reaction, effectively improving the ozone concentration in the treated water and improving the disinfection, sterilization, and treatment effects.

[0025] In some embodiments of the present invention, the filtration assembly is a filtration assembly with a backwash function, the pore size of the filtration membrane is 0.2 to 75 μm, the gas-liquid mixing method of the gas-liquid mixing assembly is micropore aeration and / or spiral gas mixing, and the ratio of the cross-sectional area of ​​the water inlet passage between the filtration assembly and the electrolysis assembly to the cross-sectional area of ​​the water outlet passage between the electrolysis assembly and the gas-liquid mixing assembly is 1:3 to 20:1.

[0026] The use of these additional technical measures has the following beneficial effects: The filtration assembly has a backwash function, preventing the pores of the filtration membrane from becoming clogged, allowing the filtered material to be discharged in a timely manner and ensuring the outflow rate of the filtered liquid. A pore size of 0.2-75 μm in the filtration membrane allows for the filtration and removal of particles and suspended solids within this range, avoiding the problem of these particles and suspended solids electrochemically coagulating into large particles during electrolysis, blocking the side slits between two adjacent branches, and making it difficult to discharge the large particles through the slits. The use of micropore aeration and / or spiral gas mixing is advantageous for more thorough gas-liquid mixing. Designing the ratio of the cross-sectional area of ​​the inlet water passage between the filtration assembly and the electrolysis assembly to the cross-sectional area of ​​the outlet water passage between the electrolysis assembly and the gas-liquid mixing assembly to be 1:3-20:1 is intended to match the processing efficiency of the electrolysis assembly and the gas-liquid mixing assembly, thereby improving the efficiency of electrolysis and gas-liquid mixing and ensuring the processing efficiency of the entire water treatment system.

[0027] In order to more clearly describe the technical solutions in the embodiments of the present invention, the following describes the drawings that need to be used in the embodiments of the present invention. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a schematic diagram of a conventional electrode structure of a two-dimensional planar BDD electrode in the prior art. [Figure 2] FIG. 1 is a schematic diagram showing the water flow direction and exhaust direction during electrolysis in a two-dimensional planar BDD electrode structure according to the prior art. [Figure 3] 1 is a schematic configuration diagram of a water treatment system according to an embodiment of the present invention. [Figure 4] FIG. 1 is a schematic diagram of an electrolysis module of an electrolysis assembly according to an embodiment of the present invention. [Figure 5] FIG. 2 is a schematic diagram of the communication end between the branched water inlet guide pipe and the cavity of the water flow guide module of the electrolysis assembly according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] In order to clarify the objectives, technical means and advantages of the present invention, each aspect of the present invention will be described in detail below with reference to specific examples. However, these specific examples are merely for the purpose of illustrating the present invention as examples, and do not limit the protection scope and substantial content of the present invention.

[0030] An embodiment of the present invention provides an electrolysis assembly and a water treatment system based on a BDD electrode. Fig. 3 shows a schematic diagram of the water treatment system of this embodiment, Fig. 4 shows a schematic diagram of the electrolysis module of the electrolysis assembly of this embodiment, and Fig. 5 shows a schematic diagram of the communication end between the branched water inlet guide pipe and the cavity of the water flow guide module of the electrolysis assembly of this embodiment.

[0031] 3 and 4, the electrolysis assembly 1 of this embodiment includes a water flow guide module 11 and an electrolysis module 12. The electrolysis module 12 is provided within the water flow guide module 11. The electrolysis module 12 includes a BDD electrode 121, which includes a main body 1211 and a plurality of branch portions 1212 provided on both sides of the main body 1211, and the main body 1211 and the plurality of branch portions 1212 on both sides thereof form a fishbone-shaped structure.

[0032] In this embodiment, the distance between adjacent branch portions 1212 (i.e., the side slit width) is 0.05 mm to 2.5 mm, the width of each branch portion 1212 is 0.05 mm to 10 mm, and the included angle α between each branch portion 1212 and the main body portion 1211 toward the tail of the fishbone-shaped structure is 0 to 90°. In this embodiment, the fishbone-shaped structure resembles the structure of a fishbone after the head has been removed, with the tail of the fishbone-shaped structure facing the tail and the neck of the fishbone-shaped structure facing away from the tail. The included angle α typically refers to the acute angle between the branch portion 1212 and the main body portion 1211, and the included angle is a maximum of 90° (i.e., the two angles formed between the branch portion 1212 and the main body portion 1211 are equal (both are 90°)).

[0033] In this embodiment, the BDD electrode 121 is manufactured by depositing a boron-doped diamond film on a fishbone-shaped substrate, and the substrate material is one selected from titanium, niobium, tantalum, nickel, single crystal silicon, polycrystalline silicon, silicon carbide single crystal, silicon carbide ceramic, silicon nitride single crystal, and silicon nitride ceramic, and the substrate is processed by a diamond wire cutting method. In this embodiment, after processing the fishbone-shaped substrate by the diamond wire cutting method, the substrate is put into a concentrated suspension of diamond fine powder and subjected to ultrasonic treatment, and the diamond fine powder is caused to collide with the surface of the substrate by ultrasonic treatment to increase the surface area, and then a boron-doped diamond film with a thickness of 0.5 to 100 μm is deposited to obtain a fishbone-shaped BDD electrode.

[0034] In this embodiment of the present invention, the BDD electrode 121 includes an anode BDD electrode and a cathode BDD electrode, and an ionic membrane 122 is provided between the anode BDD electrode and the cathode BDD electrode.While it is not shown which of the BDD electrodes on both the upper and lower sides of the ionic membrane 122 is the anode and which is the cathode, the anode and the cathode are determined based on the connection method between the BDD electrode and the positive and negative electrodes of an external battery (located outside the cavity 112 and not shown).

[0035] In this embodiment, the water flow guide module 11 includes a main water inlet guide pipe 111, a cavity 112 that communicates with the main water inlet guide pipe 111 and has a side perpendicular to the main water inlet guide pipe 111, and a branch water inlet guide pipe 113 that communicates with the cavity 112 and the main water inlet guide pipe 111 and has an end that communicates with the cavity 112 perpendicular to the upper and lower surfaces of the cavity 112. In this embodiment, the electrolysis module 12 is installed in the cavity 112 and is parallel to the upper and lower surfaces of the cavity 112, and the fishbone-shaped BDD electrode 121 has a tail that faces away from the main water inlet guide pipe 111 and a neck that faces toward the main water inlet guide pipe 111 (i.e., as shown in Figure 4, the direction from the neck to the tail of the fishbone-shaped BDD electrode 121 coincides with the direction of the main water flow formed by the main water inlet guide pipe 111).

[0036] In this embodiment, the pipe diameter ratio between branch water inlet guide pipe 113 and main water inlet guide pipe 111 is 1:1 to 1:20. The water flow in branch water inlet guide pipe 113 is controlled by switch 1131 having pulse control characteristics.

[0037] 5, the end of the branched water inlet guide pipe 113 that communicates with the cavity 112 (i.e., the communication end) has a circular pipe, duckbill, or separate structure, preferably a separate structure. In this embodiment, the separate structure includes multiple branch pipes, each corresponding to one side slit, which improves the slit flushing effect and increases the gas discharge efficiency.

[0038] 3 , the water treatment system of this embodiment includes an electrolysis assembly 1 of this embodiment. The water treatment system of this embodiment further includes a filtration assembly 2 and a gas-liquid mixing assembly 3. The electrolysis assembly 1 is located between the filtration assembly 2 and the gas-liquid mixing assembly 3, and communicates with the filtration assembly 2 via a water inlet passage 4 and with the gas-liquid mixing assembly 3 via a water outlet passage 5.

[0039] In this embodiment, the filtration assembly 2 is a filtration assembly with a backwash function, and the pore size of the filtration membrane 21 is 0.2 to 75 μm. The gas-liquid mixing method of the gas-liquid mixing assembly 3 uses micropore aeration and / or spiral gas mixing. The ratio of the cross-sectional area of ​​the water inlet passage 4 between the filtration assembly 2 and the electrolysis assembly 1 to the cross-sectional area of ​​the water outlet passage 5 between the electrolysis assembly 1 and the gas-liquid mixing assembly 3 is 1:3 to 20:1.

[0040] The operation process of the water treatment system of this embodiment is as follows: Water to be treated is introduced into the filtration assembly 2, and the water filtered by the filtration assembly 2 passes through the water inlet passage 4 into the main water inlet guide pipe 111 and the branch water inlet guide pipe 113 (a switch 1131 is provided in the branch water inlet guide pipe 113, so that the opening and closing of the branch water inlet guide pipe 113 and the amount of water flow in the branch water inlet guide pipe 113 can be controlled as needed), and then into the cavity 112, where the electrolysis module 12 in the cavity 112 electrolyzes the water using energy from an external battery (located outside the cavity 112, not shown) (during electrolysis, calcium, magnesium, etc. in the water are generally electrolyzed onto the surface of the cathode). Ions are easily accumulated, and the anode is easily corroded electrochemically. In this embodiment, the circuit controls the positive and negative electrodes of the battery to be reversed after a certain period of time, swapping the cathode and anode of the electrolysis module, so that the original cathode becomes the anode and the original anode becomes the cathode. The deposit layer on the original cathode is reversed to become the anode and then removed, further reducing the probability of clogging with particulate matter, extending the service life of the electrodes, and improving the electrolysis efficiency. After electrolysis, the water flows out of the cavity 112 through the water outlet passage 5 and enters the gas-liquid mixing assembly 3, which thoroughly mixes the water with the ozone generated by the electrolysis reaction.

[0041] Although the present invention has been described above with reference to specific embodiments, these specific embodiments are merely illustrative and do not limit the scope of protection of the present invention, and those skilled in the art may make various modifications, changes, or substitutions without departing from the spirit of the present invention. Therefore, various equivalent changes made based on the present invention belong to the scope of the present invention. [Explanation of symbols]

[0042] 1 Electrolytic Assembly 2. Filtration Assembly 3. Gas-liquid mixing assembly 4. Drowning Passage 5 Water passageway 11 Water flow guide module 12 Electrolysis Module 21 Filtration membrane 111 Main water inlet guide pipe 112 Cavity 113 Branch water inlet guide pipe 121 BDD electrode 122 Ionic membrane 1131 Switch 1211 Main body 1212 Branch

Claims

1. An electrolysis assembly based on a BDD electrode, comprising a water flow guiding module and an electrolysis module, The electrolysis module is installed in a water flow guide module; the electrolysis module includes a BDD electrode; The BDD electrode is a main body; a plurality of branch portions provided on both sides of the main body portion; Including, the main body and the plurality of branches on both sides of the main body form a fishbone-like structure; The water flow guide module includes: A main water inlet guide pipe; a cavity communicating with the main water inlet guide pipe and having a side perpendicular to the main water inlet guide pipe; a branch water inlet guide pipe that communicates with the cavity and the main water inlet guide pipe, and whose communicating end with the cavity is perpendicular to the upper and lower surfaces of the cavity; Including, the electrolysis module is installed in the cavity, and upper and lower surfaces of the electrolysis module are parallel to upper and lower surfaces of the cavity; The fishbone-shaped BDD electrode has a neck and a tail, a direction from the neck portion to the tail portion of the BDD electrode of the fishbone-shaped structure coincides with a direction of a main water flow formed by the main water inlet guide pipe; 10. An electrolysis assembly, wherein the tail of the fishbone-shaped BDD electrode is spaced a predetermined distance from the main water inlet guide pipe in the direction of the main water flow.

2. 2. The electrolytic assembly of claim 1, wherein a distance between adjacent branches is 0.05 mm to 2.5 mm, a width of each branch is 0.05 mm to 10 mm, and an included angle between each branch and the main body toward the tail of the fishbone-shaped structure is greater than 0 and less than or equal to 90°.

3. 2. The electrolytic assembly of claim 1, wherein the BDD electrode comprises a substrate having a fishbone structure and a boron-doped diamond film deposited on the substrate, and the material of the substrate is selected from the group consisting of titanium, niobium, tantalum, nickel, single crystal silicon, polycrystalline silicon, silicon carbide single crystal, silicon carbide ceramic, silicon nitride single crystal, and silicon nitride ceramic.

4. 2. The electrolytic assembly of claim 1, wherein the BDD electrodes include an anode BDD electrode and a cathode BDD electrode, and an ionic membrane is provided between the anode BDD electrode and the cathode BDD electrode.

5. 2. The electrolysis assembly according to claim 1, wherein a pipe diameter ratio between the branch water inlet guide pipe and the main water inlet guide pipe is 1:1 to 1:

20.

6. 2. The electrolysis assembly according to claim 1, wherein the water flow in the branched water inlet guide pipe is controlled by a switch having a pulse control characteristic.

7. 2. The electrolysis assembly according to claim 1, wherein the end of the branched water inlet guide pipe communicating with the cavity has a circular pipe, duckbill or liquid-separating structure.

8. 8. A water treatment system comprising the electrolysis assembly according to claim 1, further comprising a filtration assembly and a gas-liquid mixing assembly, wherein the electrolysis assembly is located between the filtration assembly and the gas-liquid mixing assembly, and communicates with the filtration assembly via a water inlet passage and with the gas-liquid mixing assembly via a water outlet passage.

9. The filtration assembly is a filtration assembly having a backwash function, and the pore size of the filtration membrane is 0.2 to 75 μm; The gas-liquid mixing method of the gas-liquid mixing assembly is to use micro-pore aeration and / or spiral gas mixing; 9. The water treatment system of claim 8, wherein a ratio of a cross-sectional area of ​​the water inlet passage between the filtration assembly and the electrolysis assembly to a cross-sectional area of ​​the water outlet passage between the electrolysis assembly and the gas-liquid mixing assembly is 1:3 to 20:1.

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