Method and device for degrading organic matters by synergy of centrifugal electrocatalysis and inclined plate type plasma discharge

Abstract

The invention belongs to the technical field of organic wastewater treatment, and particularly relates to a centrifugal electrocatalysis and inclined plate type plasma discharge synergistic organic matter degradation method and device. Through the synergistic effect of an electrochemical catalysis technology and a plasma discharge technology, the invention provides the plasma discharge device under multi-stage electro-catalysis and inclined plate gas-liquid mixing, and efficient degradation of organic wastewater is realized. The design of combining a plurality of layers of movable electrode discs and static electrode discs is adopted for electro-catalytic degradation, the heights of electrodes on the movable electrode discs are gradually reduced from inside to outside, and wastewater overflows out of the movable electrode discs step by step under the action of centrifugal force and is forced to pass through the plurality of layers of electrode plates to be subjected to forced electro-catalysis, so that the degradation efficiency of electro-catalysis is enhanced; the plasma discharge channel is designed to be an inclined plate type, a thin liquid layer is effectively formed on the surface of the inclined plate, plasma of microbubbles is facilitated, gas and liquid flow on the inclined plate in a staggered mode, contact between the gas and the liquid is tighter, and the gas-liquid mass transfer effect in the plasma discharge channel is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of organic wastewater treatment, and particularly relates to a method and device for degrading organic matter by synergistic centrifugal electrocatalysis and inclined plate plasma discharge. Background Technique

[0002] With the rapid development of industrialization and urbanization, the discharge of wastewater containing organic pollutants has been continuously increasing, posing a great threat to the ecological system and human health. However, traditional wastewater treatment technologies have obvious deficiencies in treating complex pollutants and refractory organic matter, usually including poor adaptability to complex organic pollutants, limited removal efficiency, and possible secondary pollution.

[0003] In recent years, advanced oxidation technologies based on electrocatalysis and plasma technologies have shown unique advantages in the degradation of organic pollutants, especially in treating complex, toxic or refractory organic pollutants, with remarkable effects. Electrochemical catalysis technology generates highly active oxidation species (especially ·OH radicals) through electrode reactions. These oxides can react with organic pollutants in the aqueous phase to degrade pollutant molecules. Plasma discharge technology generates gas ionization through high voltage, producing a large number of active particles (such as electrons, ions, free radicals, etc.). These active species have strong oxidizing properties and can rapidly degrade organic pollutants.

[0004] Existing wastewater degradation systems are still difficult to achieve the above degradation effects or have many defects, such as:

[0005] The invention patent "An Efficient Electrocatalytic Oxidation Treatment Device for Organic Wastewater" with the publication number CN214829624U discloses an efficient electrocatalytic oxidation treatment device for organic wastewater, including a pretreatment barrel and a catalytic chamber. The device introduces wastewater through a water inlet pipe. Under the filtration of the first and second filter plates, pollutants and impurities in the organic wastewater are effectively removed. After being treated by the pretreatment barrel, the content of impurities and pollutants in the water is significantly reduced. Although this method uses electrocatalysis technology for organic wastewater treatment, the contact between the reactants and the electrodes is not uniform enough, resulting in poor degradation effect and low energy utilization rate of the system.

[0006] The invention patent "A Plasma Microelectrolysis Integrated Organic Wastewater Treatment Device" with the publication number CN221759562U discloses a plasma microelectrolysis integrated organic wastewater treatment device. Its system includes: a corona discharge reactor, a plasma power supply, and a high-voltage generator. After the plasma power supply is boosted by the high-voltage generator, it is connected to the corona discharge reactor to generate corona discharge and form oxidizing active substances. At the same time, a microelectrolysis reaction occurs in the grounded electrode block of the microelectrolysis filler, and the metal elements in the filler cooperate with the plasma catalysis to improve the degradation efficiency of organic wastewater. Although this method can degrade organic substances by generating high-energy active particles through discharge, its degradation method is relatively single, relying only on the high-energy active particles generated by discharge and not combining with electrocatalytic technology for synergistic degradation, so the degradation efficiency is relatively low.

[0007] The invention patent "A Plasma Catalytic Oxidation Treatment Device and Method" with the publication number CN115215467B constructs a combined treatment system of plasma oxidation, photocatalytic oxidation, and multifunctional catalytic oxidation through reactor design, realizing the reuse of ultraviolet light radiation and plasma tail gas during the plasma oxidation process, and realizing the cyclic oxidation process of wastewater inside the device. However, this patent only uses photocatalysis and does not combine electrocatalytic technology, resulting in obvious deficiencies in its ability to treat complex organic pollutants, oxidation efficiency, and energy consumption. In addition, the use of a high-voltage pulsed AC power supply may lead to high energy consumption, and too high a discharge voltage may cause a burden on the equipment, increasing the energy consumption.

[0008] The invention patent "A Device and Application for Multifunctionally and Efficiently Generating Hydroxyl Radicals" with the publication number CN 106517440 B generates ozone through an ozone generator and transports it to the wastewater through a gas distributor. This design cannot ensure airtightness and increases the complexity of the device. Since CN 106517440 B does not design a plasma discharge structure, the gas utilization rate is limited.

[0009] In summary, the existing organic wastewater electrocatalytic synergistic plasma discharge degradation organic wastewater devices still have the following problems in practical applications:

[0010] First, it is difficult to degrade complex organic substances. Some organic pollutants, especially those containing benzene rings, halogens, or elements such as sulfur and nitrogen, often require stronger oxidation ability to break their chemical bonds, while the oxidation species (such as ·OH, ·O2 - ) in the conventional electrocatalytic process may not have sufficient oxidation ability to efficiently degrade these pollutants, limiting the degradation efficiency.

[0011] Second, it is difficult to control the plasma discharge region. The generation process of plasma discharge is relatively complex, and the morphology and distribution of the discharge region are difficult to precisely control, easily leading to uneven energy distribution. There may be an excessive number of high-energy particles in some regions, while other regions have insufficient energy, resulting in uneven treatment effects.

[0012] Third, only a single degradation technique is adopted. In actual wastewater, there are usually various types of pollutants. When a single technique is used for treatment, it may not be able to effectively degrade different types of pollutants simultaneously. Complex mixed wastewater may contain a variety of inorganic and organic pollutants, and different pollutants respond differently to the degradation technique, resulting in unsatisfactory treatment effects. Summary of the Invention

[0013] To solve the above problems, the present invention combines an electrocatalytic technology with a plasma discharge technology to propose a new wastewater degradation technical solution. By integrating a centrifugal structure and an inclined plate structure, the centrifugal force is used to force the liquid to undergo multi-stage electrocatalysis, ensuring the step-by-step degradation of the wastewater. The inclined plate structure effectively divides the liquid layer into thinner layers, which is beneficial for microbubble plasma and improves the gas-liquid mass transfer effect.

[0014] The wastewater degradation technical solution proposed by the present invention includes two aspects.

[0015] First, provide an organic matter degradation device that synergistically combines centrifugal electrocatalysis and inclined plate plasma discharge, including a power driving device, a waste liquid pool, an electrocatalytic degradation device, an oxygen bubble generator, a gas-liquid mass transfer plasma degradation device, and a collection pool connected in sequence from top to bottom. Among them, the waste liquid pool communicates with the electrocatalytic degradation device, the electrocatalytic degradation device communicates with the oxygen bubble generator and the gas-liquid mass transfer plasma degradation device respectively, and the gas-liquid mass transfer plasma degradation device is provided with an oxygen bubble generator;

[0016] The electrocatalytic degradation device includes an electrocatalytic reaction cavity and a static electrode plate fixed in the electrocatalytic reaction cavity through a support plate. A rotating shaft is fixed at the center of the static electrode plate, and a moving electrode plate is movably fitted on the rotating shaft; annular positive electrode plates and annular negative electrode plates are respectively provided on the static electrode plate and the moving electrode plate, and the positions of the annular positive electrode plates and the annular negative electrode plates are staggered; the electrode heights on the annular negative electrode plate gradually decrease from the inside to the outside; the rotating shaft has a hollow structure and is connected to the electrocatalytic reaction cavity and the waste liquid pool;

[0017] The gas-liquid mass transfer plasma degradation device includes a plurality of gas-liquid mass transfer channels formed by separating with a plurality of inclined plates. An inlet channel for water and an outlet channel for gas that do not interfere with each other are arranged above the gas-liquid mass transfer channels. Each inclined plate is provided with a positive electrode plate and a negative electrode plate. The wastewater degraded by the electrocatalytic degradation device enters the gas-liquid mass transfer channel through the inlet channel. The bottom of the gas-liquid mass transfer channel is connected to a cavity, and an air diffuser pipe communicating with the outside is arranged in the cavity.

[0018] Further, the power driving device includes a motor bracket connected to the top of the waste liquid tank and a rotor motor installed on the motor bracket. The output end of the rotor motor is connected to a rotating shaft through a coupling. The rotating shaft penetrates through the electrocatalytic reaction cavity and the waste liquid tank. The rotating shaft has a hollow structure and is provided with a wastewater inlet communicating with the waste liquid tank. Wastewater fluid can flow from the waste liquid tank into the hollow part of the rotating shaft through the wastewater inlet, and can be discharged from a plurality of diffusion holes distributed on the rotating shaft under the action of centrifugal force generated by the rotation of the rotating shaft and diffuse around, and an electrocatalytic reaction is carried out in the electrocatalytic reaction cavity.

[0019] Further, a plurality of layers of annular positive electrode plates and annular negative electrode plates are respectively arranged on the static electrode plate and the moving electrode plate and are interspersed in the staggered position gaps. The wastewater fluid overflows from the moving electrode plate step by step under the action of centrifugal force generated by the rotating shaft and is forced to pass through multiple electrode plates for forced electrocatalysis. The electrocatalytic reaction cavity is connected with an exhaust port.

[0020] Further, there are six inclined plates which are symmetrically distributed on both inner sides of the gas-liquid mass transfer plasma degradation device. Positive electrode plates and negative electrode plates are respectively arranged on the opposite surfaces of two adjacent inclined plates. A gas-liquid mass transfer channel is formed between any two adjacent inclined plates. A plurality of air diffuser holes are arranged on the air diffuser pipe. After the external air enters the air diffuser pipe, it is discharged into the cavity through the air diffuser holes. The generated bubbles further rise into the gas-liquid mass transfer channel and carry out a plasma discharge reaction with the wastewater liquid in the gas-liquid mass transfer channel. The organic wastewater sequentially enters the cavity and the collection tank downward. After the bubbles carry out the plasma discharge reaction, they enter the electrocatalytic reaction cavity through the outlet channel to further improve the electrocatalytic degradation efficiency, and finally the waste gas can be discharged from the exhaust port.

[0021] Further, insulating dielectric coatings are covered on the outer sides of the positive electrode plate and the negative electrode plate by an electroplating process. The insulating dielectric coatings can form dielectric barrier discharge and generate active substances such as ozone and hydroxyl radicals in water.

[0022] Further, the oxygen bubble generator includes an intake pipe and an aeration outlet device. The intake pipe is connected to the outside and the gas-liquid mass transfer channel, and the aeration outlet device is connected to the electrocatalytic reaction cavity and the gas-liquid mass transfer channel. External air enters the gas-liquid mass transfer channel through the intake pipe to undergo a plasma discharge reaction to form ozone, and the ozone enters the electrocatalytic reaction cavity through the aeration outlet device to continue participating in the electrocatalytic reaction.

[0023] Further, the aeration outlet device is provided with micropores that only allow gas to pass through and do not allow liquid or other substances to be discharged. The gas can enter the electrocatalytic reaction cavity in the form of fine bubbles through the micropores.

[0024] Further, the plurality of inclined plates can divide the liquid layer to form thinner liquid layers, and each thinner liquid layer in the liquid can contact the gas to generate strongly oxidizing active substances to promote the degradation of pollutants.

[0025] In a second aspect, the present invention provides an organic matter degradation method, which requires the use of the organic matter degradation device proposed in the first aspect. The method includes:

[0026] Step 1: Introduce air into the aeration pipe and use the oxygen bubble generator to generate oxygen, so that the oxygen enters the electrocatalytic reaction cavity.

[0027] Step 2: Transport the organic wastewater to the waste liquid pool and then enter the hollow part of the rotating shaft.

[0028] Step 3: Start the rotor motor. The organic wastewater diffuses into the electrocatalytic reaction cavity under the action of the centrifugal force generated by the rotation of the rotating shaft, so that the organic wastewater in the electrocatalytic reaction cavity is evenly distributed. The organic wastewater is forced to undergo multi-stage electrocatalysis, improving the wastewater degradation efficiency. The degraded wastewater enters the gas-liquid mass transfer plasma degradation device through the water inlet channel.

[0029] Step 4: Connect the high-voltage power supply to discharge the positive and negative plates to form a dielectric barrier plasma discharge, generating ozone and hydroxyl radicals in the water. Use ozone and hydroxyl radicals as strong oxidants to quickly and effectively degrade the organic pollutants in the wastewater, deeply degrade the organic wastewater. The generated ozone enters the electrocatalytic reaction cavity through the air outlet channel, improving the electrocatalytic degradation efficiency.

[0030] Step 5: Pump the degraded wastewater into the collection pool for storage.

[0031] The beneficial effects of the present invention:

[0032] (1) The dynamic and static electrodes of the present invention are set in a wavy shape, further increasing the reaction area of electrocatalysis and improving the electrocatalytic degradation efficiency.

[0033] (2) The present invention inputs wastewater into the hollow part of the rotating shaft, and the electrode height on the moving electrode plate gradually decreases from the inside to the outside, so that the wastewater overflows from the moving electrode plate step by step under the action of centrifugal force and is forced to undergo electrocatalysis.

[0034] (3) The present invention combines electrocatalysis technology and plasma discharge technology. During the electrocatalysis process, some active substances such as ozone and hydroxyl radicals (OH·) will be generated on the electrode surface, which can effectively degrade organic pollutants and refractory substances in organic wastewater. The organic wastewater after the electrocatalysis reaction further undergoes plasma discharge. Through the dielectric barrier plasma technology, a low-temperature plasma rich in active substances such as ozone, free radicals, electrons and excited state molecules is generated in the organic wastewater. These active substances have strong oxidation ability and deeply degrade the organic wastewater. This synergistic effect can not only degrade organic matter more thoroughly, but also effectively shorten the degradation time and reduce the energy consumption.

[0035] (4) The electrocatalytic degradation device of the present invention is designed as a centrifugal type and is provided with multiple layers of annular electrodes. The wastewater is input from the hollow rotating shaft, and the electrode height on the annular negative electrode plate of the moving electrode plate gradually decreases from the inside to the outside. Under the action of the centrifugal force generated by the rotation of the rotating shaft, the fluid overflows from the moving electrode plate step by step and is forced to undergo electrocatalysis. During the process of the liquid passing through multiple layers of electrodes, it is forced to contact between the rotating and stationary electrodes multiple times, thereby realizing continuous multi-stage electrocatalytic reactions, ensuring the step-by-step degradation of pollutants, and improving the overall reaction efficiency.

[0036] (5) The present invention designs the plasma channel as an inclined plate type and designs the gas-liquid inlet and outlet channels as a non-interfering structure. The inclined plate type plasma channel effectively divides the liquid layer into thinner layers, which is beneficial to the plasma generation of microbubbles. The plasma generation of microbubbles generates a large amount of active substances (such as ozone and hydroxyl radicals) at the gas-liquid interface. The gas and liquid flow crosswise on the inclined plate, and these substances quickly dissolve into the liquid phase at the gas-liquid crosswise interface and react with pollutants, which not only improves the pollutant degradation efficiency but also reduces the energy consumption. In addition, the non-interference of the gas-liquid inlet and outlet channels ensures that the ozone generated by the plasma discharge enters the electrocatalytic degradation device, further enhancing the electrocatalytic degradation effect. Description of the Drawings

[0037] Figure 1 It is a schematic diagram of the overall device in an embodiment of the present invention.

[0038] Figure 2 is Figure 1 a schematic diagram of the main connection structure in

[0039] Figure 3 a schematic diagram of the structure of the combination of the moving and stationary electrode plates in an embodiment of the present invention;

[0040] Figure 4Schematic structural diagram of the rotating shaft in an embodiment of the present invention

[0041] Figure 5 Schematic structural diagram of the aeration pipe in an embodiment of the present invention;

[0042] Figure 6 Top view of the aeration outlet device in an embodiment of the present invention;

[0043] Figure 7 Flow chart of the organic matter degradation method in an embodiment of the present invention.

[0044] Explanation of reference numerals: 1, power driving device; 11, rotor motor; 12, coupling; 13, motor bracket; 2, electrocatalytic degradation device; 21, static electrode plate; 211, first through hole; 22, annular positive electrode plate; 23, moving electrode plate; 231, second through hole; 24, annular negative electrode plate; 25, rotating shaft; 251, rotating shaft inlet; 252, diffusion hole; 26, support plate; 27, electrocatalytic reaction cavity; 28, exhaust port; 3, oxygen bubble generator; 31, intake pipeline; 32, aeration outlet; 4, gas-liquid mass transfer plasma degradation device; 41, inclined plate; 42, positive electrode plate; 43, negative electrode plate; 44, water inlet channel; 45, gas outlet channel; 46, gas-liquid mass transfer channel; 47, cavity; 48, aeration pipe; 481, aeration hole; 482, air inlet; 5, collection tank; 51, degraded wastewater outlet; 6, waste liquid tank; 61, organic wastewater inlet; 7, DC pump. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, the terms "first" and "second" are only used to distinguish similar components or parts at different positions or with different features, and have no other defined meanings; the term "upper" refers to the direction in which each component deviates from the ground, and the term "lower" refers to the direction in which each component is away from the ground.

[0048] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0049] As Figure 1 shown, the present invention provides an organic matter degradation device that synergistically combines centrifugal electrocatalysis and inclined plate plasma discharge, including a power driving device 1, a waste liquid pool 6, an electrocatalytic degradation device 2, an oxygen bubble generator 3, a gas-liquid mass transfer plasma degradation device 4, and a collection pool 5 that are connected in sequence from top to bottom. Among them, the waste liquid pool 6 communicates with the electrocatalytic degradation device 2, the electrocatalytic degradation device 2 communicates with the oxygen bubble generator 3 and the gas-liquid mass transfer plasma degradation device 4 respectively, and the gas-liquid mass transfer plasma degradation device 4 is provided with the oxygen bubble generator 3; the bottom of the gas-liquid mass transfer plasma degradation device 4 is connected to the collection pool 5 through a DC pump 7. The organic wastewater in the waste liquid pool 6 is preliminarily degraded by the electrocatalytic degradation device 2 and then enters the gas-liquid mass transfer channel to generate a gas-liquid two-phase solution with microbubbles, and the gas-liquid mass transfer plasma degradation device 4 can ionize and degrade the gas-liquid two-phase solution.

[0050] As Figure 2 shown, the power driving device 1 includes a motor bracket 12 connected to the top of the waste liquid pool 6 and a rotor motor 11 installed on the motor bracket 12. The output end of the rotor motor 11 is connected to a rotating shaft 25 through a coupling 13; the rotating shaft 25 penetrates through the electrocatalytic reaction cavity 27 and the waste liquid pool 6. The rotating shaft 25 has a hollow structure and is provided with a wastewater inlet 251 communicating with the waste liquid pool 6; wastewater fluid can flow from the waste liquid pool 6 into the hollow part of the rotating shaft 25 through the wastewater inlet 251, and can be discharged and diffused around from a plurality of diffusion holes 252 distributed on the rotating shaft 25 under the centrifugal force generated by the rotation of the rotating shaft 25, and an electrocatalytic reaction is carried out in the electrocatalytic reaction cavity 27.

[0051] The electrocatalytic degradation device 2 includes an electrocatalytic reaction cavity 27 and a static electrode plate 21 fixed in the electrocatalytic reaction cavity 27 through a support plate 26. The electrocatalytic reaction cavity 27 is connected with an exhaust port 28. A rotating shaft 25 is fixed at the center of the static electrode plate 21. A moving electrode plate 23 is movably fitted on the rotating shaft 25. The rotating shaft 25 passes through a first through hole 211 on the static electrode plate 21 and a second through hole 231 on the moving electrode plate 23 respectively. The rotor motor 11 drives the moving electrode plate 23 to rotate through a coupling 12 and the rotating shaft 25. Multiple layers of annular positive plates 22 and annular negative plates 24 are arranged on the static electrode plate 21 and the moving electrode plate 23 respectively to form two multi-layered annular plate structures. There is a certain gap between each layer. The annular positive plates 22 and the annular negative plates 24 are staggered in position and interpenetrate each other in the staggered position gaps. The rotating shaft has a hollow structure and is communicated with the electrocatalytic reaction cavity 27 and the waste liquid pool 6. In Figure 3 the example of, the electrode height of the annular negative plate 24 on the moving electrode plate 23 decreases step by step from the inside to the outside. Under the action of the centrifugal force generated by the rotating shaft 25, the wastewater fluid overflows from the moving electrode plate 23 step by step and is forced to perform multi-stage electrocatalysis. Multi-stage electrocatalysis can gradually oxidize complex organic substances or refractory substances, ensuring that pollutants are completely decomposed, greatly improving the degradation efficiency and reducing the energy consumption.

[0052] The gas-liquid mass transfer plasma degradation device 4 includes a plurality of gas-liquid mass transfer channels 46 separated by a plurality of inclined plates 41. An inlet channel 44 and an outlet channel 45 are correspondingly arranged above each gas-liquid mass transfer channel 46. Each inclined plate 41 is provided with a positive electrode plate 42 and a negative electrode plate 43. The positive electrode plate 42 and the negative electrode plate 43 are connected to a high-voltage power supply through a wire. The wastewater degraded by the electrocatalytic degradation device 2 enters the gas-liquid mass transfer channel 46 through the inlet channel 44. The bottom of the gas-liquid mass transfer channel 46 is connected with a cavity 47. The cavity 47 is provided with an air supply pipe 48 communicating with the outside.

[0053] Further, there are six inclined plates 41 which are symmetrically distributed on both inner sides of the gas-liquid mass transfer plasma degradation device 4. A positive electrode plate 42 and a negative electrode plate 43 are respectively arranged on the opposite surfaces of two adjacent inclined plates. A gas-liquid mass transfer channel 46 is formed between any two adjacent inclined plates. By applying a sufficiently high voltage between the positive and negative electrode plates, a dielectric barrier plasma discharge phenomenon is formed, thereby generating active substances such as ozone and hydroxyl radicals in the water to deeply degrade the organic wastewater. A plurality of air supply holes 481 are arranged on the air supply pipe 48. The outlet channel 45 is fixed on the wall surface of the electrocatalytic reaction cavity 27 by a support rod.

[0054] The plurality of inclined plates 41 can divide the liquid layer to form a thinner liquid layer. Each thinner liquid layer in the liquid can contact with the gas to generate active substances with strong oxidizing properties, and have sufficient mass transfer with the liquid, which is beneficial to the plasmaization of microbubbles. During the plasma discharge reaction, the active components in the gas generate active substances with strong oxidizing properties such as ozone and hydroxyl free radicals through the plasma action. These active substances have extremely high chemical reactivity and can quickly oxidize and decompose pollutants in the liquid, thereby achieving efficient degradation of pollutants.

[0055] Since the gas-liquid mass transfer channel 46 is separated by the inclined plate 41, the gas-liquid mass transfer channel 46 is a channel structure with a certain slope or twist, so that the gas and the liquid can flow alternately in the gas-liquid mass transfer channel 46, thereby expanding the contact area between the gas and the liquid, and more efficiently transferring the active substances in the gas such as ozone, hydroxyl radicals, etc. to the liquid, thereby improving the degradation efficiency.

[0056] After external air enters the aeration pipe 48, it is discharged into the cavity 47 through the aeration hole 481. The generated bubbles further rise and enter the gas-liquid mass transfer channel 46 to undergo a plasma discharge reaction with the wastewater liquid in the gas-liquid mass transfer channel 46. The organic wastewater moves downward into the cavity 47 and the collection tank 5 in turn. After the plasma discharge reaction, the bubbles enter the electrocatalytic reaction chamber 27 through the outlet channel 45, further improving the electrocatalytic degradation efficiency. The exhaust gas can finally be discharged from the exhaust port 28.

[0057] exist Figure 6 In the example, the aeration outlet device 32 is distributed with multiple air holes and can be installed above the air outlet channel 45 to facilitate uniform passage of gas; the water inlet channel 44 is located on the periphery of the air outlet channel 45, and the liquid and gas pass through the water inlet channel 44 and the air outlet channel 45 respectively when entering and escaping the gas-liquid mass transfer plasma degradation device 4, and the two channels do not interfere with each other.

[0058] Furthermore, the outer sides of the positive plate 42 and the negative plate 43 are covered with an insulating dielectric coating 49 through an electroplating process; the insulating dielectric coating 49 can form a dielectric barrier discharge and generate active substances such as ozone and hydroxyl radicals in water to prevent the electrodes from directly contacting the liquid.

[0059] Furthermore, the oxygen bubble generator 3 includes an air inlet pipe 31 and an aeration outlet device 32, the air inlet pipe 31 connects the outside and the gas-liquid mass transfer channel 46, and the aeration outlet device 32 connects the electrocatalytic reaction chamber 27 and the gas-liquid mass transfer channel 46; the external air enters the gas-liquid mass transfer channel 46 through the air inlet pipe 31 to undergo a plasma discharge reaction to form ozone, and the ozone enters the electrocatalytic reaction chamber 27 through the aeration outlet device 32 to continue to participate in the electrocatalytic reaction.

[0060] Further, the aeration outlet device 32 is provided with micropores, which only allow gas to pass through and do not allow liquid or other substances to be discharged. The gas can enter the electrocatalytic reaction cavity 27 in the form of fine bubbles through the micropores, further strengthening the electrocatalytic degradation process.

[0061] Example 1

[0062] As Figure 7 shown, the present invention provides an organic matter degradation method, which needs to use the organic matter degradation device proposed in the first aspect. The method includes:

[0063] Step 1: Introduce air into the aeration pipe 48 and the intake pipe 31 and generate oxygen by using the oxygen bubble generator 3. The oxygen enters the electrocatalytic reaction cavity 27 through the aeration outlet 32.

[0064] Step 2: Transport the organic wastewater to the waste liquid pool 6 through the organic wastewater inlet 61. The organic wastewater enters the hollow part of the rotating shaft 25 through the rotating shaft inlet 251.

[0065] Step 3: When the organic wastewater enters the rotating shaft 25, start the rotor motor. The organic wastewater diffuses into the electrocatalytic reaction cavity 27 through the diffusion holes 252 under the action of the centrifugal force generated by the rotation of the rotating shaft, so that the organic wastewater in the electrocatalytic reaction cavity 27 is evenly distributed. The organic wastewater is forced to perform multi-stage electrocatalysis, improving the wastewater degradation efficiency. The degraded wastewater enters the gas-liquid mass transfer plasma degradation device 4 through the water inlet channel 44.

[0066] Step 4: Connect the high-voltage power supply to discharge the positive electrode plate 42 and the negative electrode plate 43 to form a dielectric barrier plasma discharge, generating ozone and hydroxyl radicals in the water. Use ozone and hydroxyl radicals as strong oxidants to quickly and effectively degrade the organic pollutants in the wastewater, deeply degrade the organic wastewater. The generated ozone enters the electrocatalytic reaction cavity 27 through the air outlet channel 45, improving the electrocatalytic degradation efficiency.

[0067] Step 5: Turn on the DC pump 7, pump the degraded wastewater from the wastewater outlet 51 at the bottom of the cavity 47 into the collection pool for storage, and the waste gas is discharged from the exhaust port 28.

[0068] The ozone generated by the plasma discharge of the present invention can be fully mixed with the initially degraded wastewater through the gas outlet, which neither affects the downward flow of the liquid nor affects the upward discharge of the gas. Kinetic energy exchange is formed between the gas and the liquid, and the degradation effect is better than that of directly introducing ozone into the wastewater in CN106517440B.

[0069] Although the present invention has been disclosed above in its preferred embodiments, it is not intended to limit the present invention. Anyone skilled in this technology can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims.

Claims

1. An organic matter degradation device combining centrifugal electrocatalysis and inclined plate plasma discharge, characterized in that It includes a power drive device (1), a waste liquid pool (6), an electrocatalytic degradation device (2), an oxygen bubble generator (3), a gas-liquid mass transfer plasma degradation device (4), and a collection pool (5) connected in sequence from top to bottom. Among them, the waste liquid pool (6) communicates with the electrocatalytic degradation device (2), the electrocatalytic degradation device (2) communicates with the oxygen bubble generator (3) and the gas-liquid mass transfer plasma degradation device (4) respectively, and the gas-liquid mass transfer plasma degradation device (4) is provided with an oxygen bubble generator (3). The electrocatalytic degradation device (2) includes an electrocatalytic reaction cavity (27) and a static electrode plate (21) fixed in the electrocatalytic reaction cavity (27) through a support plate (26). A rotating shaft (25) is fixed at the center of the static electrode plate (21), and a moving electrode plate (23) is movably fitted on the rotating shaft (25); an annular positive electrode plate (22) and an annular negative electrode plate (24) are respectively provided on the static electrode plate (21) and the moving electrode plate, and the positions of the annular positive electrode plate (22) and the annular negative electrode plate (24) are staggered; the rotating shaft has a hollow structure and is connected to the electrocatalytic reaction cavity (27) and the waste liquid pool (6). The gas-liquid mass transfer plasma degradation device (4) includes a plurality of gas-liquid mass transfer channels (46) separated by a plurality of inclined plates (41). An inlet channel (44) and an outlet channel (45) that do not interfere with each other are arranged at the upper part of the gas-liquid mass transfer channel (46). Each inclined plate (41) is provided with a positive electrode plate (42) and a negative electrode plate (43). The wastewater degraded by the electrocatalytic degradation device (2) enters the gas-liquid mass transfer channel (46) through the inlet channel (44); the bottom of the gas-liquid mass transfer channel (46) is connected to a cavity (47), and an air supply pipe (48) communicating with the outside is arranged in the cavity (47).

2. The organic matter degradation device according to claim 1, wherein The power drive device (1) includes a motor bracket (12) connected to the top of the waste liquid pool (6) and a rotor motor (11) installed on the motor bracket (12). The output end of the rotor motor (11) is connected to the rotating shaft (25) through a coupling (13); the rotating shaft (25) penetrates through the electrocatalytic reaction cavity (27) and the waste liquid pool (6), and the rotating shaft (25) has a hollow structure and is provided with a wastewater inlet (251) communicating with the waste liquid pool (6); wastewater fluid can flow from the waste liquid pool (6) into the hollow part of the rotating shaft (25) through the wastewater inlet (251), and can be discharged from a plurality of diffusion holes (252) distributed on the rotating shaft (25) and diffused around under the action of the centrifugal force generated by the rotation of the rotating shaft (25), and an electrocatalytic reaction is carried out in the electrocatalytic reaction cavity (27).

3. The organic matter degradation device according to claim 2, wherein, The static electrode plate (21) and the moving electrode plate (23) are respectively arranged with multiple layers of annular positive electrode plates (22) and annular negative electrode plates (24), which are interspersed in the staggered position gaps; the electrode height of the annular negative electrode plates (24) on the moving electrode plate (23) gradually decreases from the inside to the outside, and the wastewater fluid overflows from the moving electrode plate (23) step by step under the action of the centrifugal force generated by the rotating shaft (25), forcing the wastewater to pass through multiple layers of electrode plates step by step for electrocatalysis; the electrocatalytic reaction cavity (27) is connected with an exhaust port (28).

4. The organic matter degradation device according to claim 3, wherein, There are six inclined plates (41), which are symmetrically distributed on both inner sides of the gas-liquid mass transfer plasma degradation device (4). Positive electrode plates (42) and negative electrode plates (43) are respectively arranged on the opposite surfaces of two adjacent inclined plates. A gas-liquid mass transfer channel (46) is formed between any two adjacent inclined plates; a plurality of air holes (481) are arranged on the air supply pipe (48). After external air enters the air supply pipe (48), it is discharged into the cavity (47) through the air holes (481). The generated bubbles further rise into the gas-liquid mass transfer channel (46) to carry out a plasma discharge reaction with the wastewater liquid in the gas-liquid mass transfer channel (46). The organic wastewater sequentially enters the cavity (47) and the collection pool (5) downward. After the plasma discharge reaction, the bubbles enter the electrocatalytic reaction cavity (27) through the air outlet channel (45) to further improve the electrocatalytic degradation efficiency, and finally the waste gas can be discharged from the exhaust port (28).

5. The organic matter degradation device according to claim 4, characterized in that, Insulating medium coatings (49) are covered on the outer sides of the positive electrode plate (42) and the negative electrode plate (43) by electroplating process; the insulating medium coatings (49) can form dielectric barrier discharge and generate active substances such as ozone and hydroxyl radicals in water.

6. The organic matter degradation device according to claim 5, wherein, The oxygen bubble generator (3) includes an intake pipe (31) and an aeration outlet device (32). The intake pipe (31) communicates with the outside and the gas-liquid mass transfer channel (46), and the aeration outlet device (32) communicates with the electrocatalytic reaction cavity (27) and the gas-liquid mass transfer channel (46); external air enters the gas-liquid mass transfer channel (46) through the intake pipe (31) to carry out a plasma discharge reaction to form ozone, and the ozone enters the electrocatalytic reaction cavity (27) through the aeration outlet device (32) to continue to participate in the electrocatalytic reaction.

7. The organic matter degradation device according to claim 6, wherein Micropores are formed on the aeration outlet device (32), and only gas is allowed to pass through the micropores without allowing liquid or other substances to be discharged. The gas can enter the electrocatalytic reaction cavity (27) in the form of fine bubbles through the micropores.

8. The organic matter degradation device according to claim 7, wherein, The multiple inclined plates (41) can divide the liquid layer to form thinner liquid layers, and each thinner liquid layer in the liquid can contact with the gas to generate active substances with strong oxidizing property to promote the degradation of pollutants.

9. A method for degrading organic matter, characterized in that, Using the organic matter degradation device according to any one of claims 1-8, the method includes: Step 1: Introduce air into the air supply pipe (48) and generate oxygen by using the oxygen bubble generator (3) so that the oxygen enters the electrocatalytic reaction cavity (27); Step 2: Transport the organic wastewater to the waste liquid pool (6) and then enter the hollow part of the rotating shaft (25); Step 3: Start the rotor motor (11). Under the action of the centrifugal force generated by the rotation of the rotating shaft (25), the organic wastewater diffuses into the electrocatalytic reaction cavity (27), so that the organic wastewater in the electrocatalytic reaction cavity (27) is evenly distributed. The organic wastewater is forced to undergo multi-stage electrocatalysis, improving the wastewater degradation efficiency. The degraded wastewater enters the gas-liquid mass transfer plasma degradation device (4) through the water inlet channel (44); Step 4: Connect the high-voltage power supply to discharge the positive electrode plate (42) and the negative electrode plate (43) to form a dielectric barrier plasma discharge, generating ozone and hydroxyl radicals in the water. Use ozone and hydroxyl radicals as strong oxidants to quickly and effectively degrade the organic pollutants in the wastewater, and deeply degrade the organic wastewater. The generated ozone enters the electrocatalytic reaction cavity (27) through the gas outlet channel (45) to improve the electrocatalytic degradation efficiency; Step 5: Pump the degraded wastewater into the collection pool (5) for storage, and discharge the waste gas from the exhaust port (28).

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