Liquid film microbubble filling coupling wastewater treatment device with segmented electric field

Abstract

The application discloses a liquid film microbubble filling coupling wastewater treatment device with a segmented electric field, comprising a reactor shell, a medium reaction tube, a high-voltage electrode assembly, a grounding electrode assembly arranged along the axial direction of the medium reaction tube, a liquid distribution module, a filling enhancement module, a microbubble aeration module, a liquid inlet module, a liquid outlet module, a gas inlet module and a tail gas discharge module. The high-voltage electrode assembly, the medium reaction tube and the grounding electrode assembly jointly form a dielectric barrier discharge area; the liquid distribution module causes the wastewater to be treated to form a downward flowing liquid film along the surface of the filling enhancement module, and the microbubble aeration module disperses the reaction gas into upward moving microbubbles, so that the microbubbles contact the liquid film in the dielectric barrier discharge area. Through the coupling effect of the segmented electric field, the liquid film, the microbubbles and the filling interface, the device improves the gas-liquid mass transfer efficiency and the active species utilization rate, and enhances the oxidative degradation effect of pollutants in the wastewater.

Description

Technical Field

[0001] This invention relates to the field of low-temperature plasma wastewater treatment technology, and in particular to a liquid film microbubble filling coupled wastewater treatment device with a segmented electric field. Background Technology

[0002] With the development of industries such as printing and dyeing, chemicals, pharmaceuticals, pesticides, and fine chemicals, the types and concentrations of recalcitrant organic pollutants in industrial wastewater are constantly increasing. Traditional biochemical methods, adsorption methods, and single advanced oxidation methods often suffer from insufficient treatment efficiency, long operating cycles, poor adaptability, or high risks of secondary pollution when treating wastewater with high color, high toxicity, and recalcitrant biodegradability. Therefore, developing novel wastewater treatment devices with compact structures, high reaction efficiency, and suitability for continuous operation has become an important research direction in this field.

[0003] Low-temperature plasma technology can generate hydroxyl radicals, ozone, hydrogen peroxide, and other reactive oxygen and nitrogen species under ambient temperature and pressure conditions, enabling efficient oxidative degradation of organic pollutants. Dielectric barrier discharge, as a typical form of low-temperature plasma, features low discharge temperature, rapid start-up, flexible structure, and suitability for modular integration, thus showing promising application prospects in wastewater treatment.

[0004] However, existing dielectric barrier discharge wastewater treatment devices generally suffer from the following shortcomings: First, the liquid is mostly in an immersed or static form, resulting in limited contact area between plasma active species and the liquid phase, leading to low effective mass transfer efficiency; second, the interface renewal rate between the reactant gas and the liquid is slow, and some short-lived active species are quenched or lost before entering the liquid phase; third, the coupling of electric field distribution, flow field distribution, and gas-liquid contact state within the discharge zone is insufficient, easily leading to strong local treatment but weak overall treatment; fourth, although some devices employ enhancement methods such as liquid film, filling structure, microbubble introduction, or electrode segmentation, they are mostly arranged in parallel, and a structural coupling relationship capable of stably achieving multi-stage discharge, reverse mass transfer, and multi-interface synergistic effects within the same reactor has not yet been formed.

[0005] Therefore, there is an urgent need to provide a dielectric barrier discharge wastewater treatment device that can simultaneously enhance the discharge process, gas-liquid mass transfer process, and liquid contact process, and can spatially couple the segmented electric field, the filling and reinforcing interface, the downward flow of the liquid film, and the upward flow of microbubbles, so as to improve the pollutant degradation efficiency, energy utilization efficiency, and operational stability. Summary of the Invention

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a liquid film microbubble filling coupled wastewater treatment device with a segmented electric field. Through the coupling effect of the segmented electric field, liquid film, microbubbles, and filling interface, the gas-liquid mass transfer efficiency and the utilization rate of active species are improved, thereby enhancing the oxidative degradation effect of pollutants in wastewater.

[0007] According to the present invention, a liquid film microbubble filling coupled wastewater treatment device with a segmented electric field includes a reactor shell, a dielectric reaction tube disposed within the reactor shell, a high-voltage electrode assembly disposed within the dielectric reaction tube, a grounding electrode assembly disposed on the inner wall of the reactor shell and arranged in segments along the axial direction of the dielectric reaction tube, a liquid distribution module disposed at the upper part of the reactor shell, a filling enhancement module disposed between the dielectric reaction tube and the reactor shell, a microbubble aeration module disposed at the lower part of the reactor shell, a liquid inlet module communicating with the liquid distribution module, a liquid outlet module disposed at the lower part of the reactor shell, an air inlet module communicating with the microbubble aeration module, and a tail gas emission module disposed at the upper part of the reactor shell; wherein, the high-voltage electrode assembly, the dielectric reaction tube, and the grounding electrode assembly together form a dielectric barrier discharge zone; the liquid distribution module is used to distribute the wastewater to be treated above the filling enhancement module and to form a downward flowing liquid film of the wastewater to be treated along the surface of the filling enhancement module; the microbubble aeration module is used to disperse the reactive gas into upward moving microbubbles and to make the microbubbles contact the liquid film within the dielectric barrier discharge zone.

[0008] Preferably, the grounding electrode assembly includes multiple segmented electrodes arranged at intervals along the axial direction of the dielectric reaction tube, with an insulating gap between adjacent segmented electrodes. The axial coverage of each segmented electrode at least partially corresponds to different height segments of the filler reinforcement module, so as to form multiple discharge processing areas in the axial direction of the dielectric reaction tube, including the filler reinforcement module, liquid film, microbubbles, and dielectric barrier discharge.

[0009] Preferably, the z-axis is established along the axial direction of the reactor, and the axial coverage area of ​​the i-th grounding electrode along the z-axis is defined as follows: : ; in, and Let these represent the lower and upper positions of the i-th grounding electrode in the axial direction, respectively. Let the axial coverage area of ​​the fill enhancement module corresponding to the i-th grounding electrode in the z-axis direction be denoted as . : ; in, and These represent the lower and upper positions of the corresponding filler reinforcement module in the axial direction, respectively, and the axial overlap length between the i-th grounding electrode and the corresponding filler reinforcement module. Defined as: ; axial length of the i-th grounding electrode and the axial height of the corresponding infill reinforcement module They are defined as follows: ; ; The axial structural coupling coefficient between the i-th segment grounding electrode and the corresponding filler reinforcement module satisfy: ; and: ≥0.5.

[0010] Preferably, the axial structural coupling coefficient between the i-th grounding electrode and the corresponding filler reinforcement module is... satisfy: ≥0.7.

[0011] Preferably, the axial coverage area of ​​the i-th segment discharge region is defined as follows: The axial coverage area of ​​the liquid film within the i-th segment discharge region is: The axial coverage area of ​​the microbubble within the i-th segment discharge region is The axial coupling region within the i-th segment discharge region is formed by the segmented electric field, the filling enhancement module, the downward liquid film, and the upward microbubbles. satisfy: ; and: ; set up The axial length is The axial length of the i-th segment discharge region is Then the multi-interface coupling coefficient in the i-th segment discharge region satisfy: ; and: ≥0.5.

[0012] Preferably, the multi-interface coupling coefficient within the i-th segment discharge region satisfy: ≥0.7.

[0013] Preferably, the liquid distribution module is one or more of a horizontal liquid distribution manifold, a porous liquid distribution pipe, an annular overflow, a porous liquid distribution plate, or a spray head. The liquid distribution module is located above the filling and reinforcing module, and the liquid outlet of the liquid distribution module is arranged facing the upper end face and / or the outer surface of the filling and reinforcing module, so that the wastewater to be treated forms a continuous liquid film or an intermittent liquid film on the surface of the filling and reinforcing module.

[0014] Preferably, the microbubble aeration module includes a gas distribution chamber and a microporous aeration element, wherein the microporous aeration element is one or more of the following: perforated aeration plate, microporous aeration plate, microporous ceramic component, sintered metal membrane, porous glass plate or hollow fiber membrane.

[0015] Preferably, the high-voltage electrode assembly is one of a rod-shaped electrode, a spiral electrode, a spring-shaped electrode, or a tubular electrode; the dielectric reaction tube is a quartz tube, an alumina ceramic tube, or a glass ceramic tube.

[0016] Preferably, the filling reinforcement module is one or more of the following: honeycomb ceramic, structured corrugated filler, porous ceramic block, ceramic ring, quartz particles, sintered quartz particles, glass beads, or glass material filler. The surface of the filling reinforcement module is loaded with a catalytic material, which is one or more of the following: titanium dioxide, manganese oxide, iron oxide, alumina, or activated carbon.

[0017] The beneficial effects of this invention are: This invention, by arranging a dielectric reaction tube, a high-voltage electrode assembly, and a grounding electrode assembly segmented along the axial direction of the dielectric reaction tube within the reactor shell, creates segmented action areas within the dielectric barrier discharge zone along the wastewater flow direction. This reduces the problem of uneven discharge intensity in a single area, allowing wastewater to be treated by discharge sequentially at different heights, thereby improving the uniformity and stability of the discharge treatment. This invention distributes the wastewater to be treated above the filling and reinforcement module through a liquid distribution module, so that the wastewater forms a downward flowing liquid film along the surface of the filling and reinforcement module. Compared with immersion or static water treatment methods, the liquid film can increase the contact area between the wastewater and plasma active species, which is beneficial to improving the efficiency of pollutant oxidation and degradation. This invention disperses the reactive gas into upward-moving microbubbles through a microbubble aeration module, allowing the microbubbles to contact the downward-flowing liquid film within the dielectric barrier discharge region. This increases the gas-liquid interface and accelerates interface renewal, which is beneficial for improving the transfer and utilization efficiency of active species such as ozone, hydroxyl radicals, and hydrogen peroxide into the liquid phase. This invention provides a filling enhancement module between the medium reaction tube and the reactor shell, which can provide an adhesion and flow guiding surface for the liquid film, extend the gas-liquid contact path, and form a coupled processing area of ​​filling interface, liquid film, microbubbles and discharge effect in conjunction with the segmented electric field. (5) The overall structure of the present invention integrates liquid distribution, microbubble aeration, filling enhancement and dielectric barrier discharge in the same reactor, which can simultaneously enhance the discharge process, gas-liquid mass transfer process and liquid phase contact process in a compact device space, which is beneficial to improve the treatment efficiency of the device for recalcitrant organic wastewater, and is easy to use in conjunction with modules such as circulation treatment, tail gas emission and online monitoring. Attached Figure Description

[0018] In the attached diagram: Figure 1 This is a schematic diagram of a liquid film microbubble filling coupled wastewater treatment device with a segmented electric field; Figure 2 This is a diagram of the liquid film microbubble filling coupled wastewater treatment device with segmented electric field constructed in Example 2; Figure 3 This is a partial enlarged view of the segmented grounding electrode assembly and the fill enhancement module in Example 2; Figure 4 This is a schematic diagram of the flow connection of the wastewater treatment device in Example 2.

[0019] In the diagram: 1-Reactor shell; 2-Media reaction tube; 3-High-voltage electrode assembly; 4-Grounding electrode assembly; 5-Liquid distribution module; 6-Filling enhancement module; 7-Microbubble aeration module; 8-Liquid inlet module; 9-Liquid outlet module; 10-Air inlet module; 11-Tail gas emission module; 12-Circulating liquid storage module; 13-Tail gas condensation and reflux module; 14-Online monitoring module; 15-Support connector; 16-Sealing assembly; 17-Liquid collection module. Detailed Implementation

[0020] Example 1: Reference Figure 1A liquid film microbubble-filled coupled wastewater treatment device with a segmented electric field includes a reactor shell 1, a medium reaction tube 2 disposed within the reactor shell 1, a high-voltage electrode assembly 3 disposed within the medium reaction tube 2, a grounding electrode assembly 4 disposed on the inner wall of the reactor shell 1 and arranged in segments along the axial direction of the medium reaction tube 2, a liquid distribution module 5 disposed on the upper part of the reactor shell 1, a filling enhancement module 6 disposed between the medium reaction tube 2 and the reactor shell 1, a microbubble aeration module 7 disposed on the lower part of the reactor shell 1, and a liquid inlet module 8 connected to the liquid distribution module 5. The reactor shell 1 includes a liquid outlet module 9 at the bottom, an air inlet module 10 connected to a microbubble aeration module 7, and a tail gas emission module 11 at the top of the reactor shell 1. The high-voltage electrode assembly 3, the dielectric reaction tube 2, and the grounding electrode assembly 4 together form a dielectric barrier discharge zone. The liquid distribution module 5 is used to distribute the wastewater to be treated above the filling enhancement module 6 and to form a downward flowing liquid film along the surface of the filling enhancement module 6. The microbubble aeration module 7 is used to disperse the reaction gas into upward-moving microbubbles and to make the microbubbles contact the liquid film within the dielectric barrier discharge zone.

[0021] Clearly, based on the above, this device can achieve the synergistic effects of liquid film contact, microbubble mass transfer, filling interface enhancement, and segmented discharge treatment within the same reactor, thereby increasing the contact probability between active species and pollutants in wastewater, which is beneficial to enhancing the wastewater oxidation degradation efficiency and treatment stability.

[0022] In this embodiment, the grounding electrode assembly 4 includes a plurality of segmented electrodes arranged at intervals along the axial direction of the dielectric reaction tube 2. An insulating gap is provided between adjacent segmented electrodes. The axial coverage of each segmented electrode corresponds at least partially to different height segments of the filling enhancement module 6, so as to form a plurality of discharge processing areas in the axial direction of the dielectric reaction tube 2, including the filling enhancement module 6, liquid film, microbubbles and dielectric barrier discharge effect.

[0023] Obviously, based on the above, multiple sequentially distributed discharge treatment areas are formed in the axial direction of the dielectric reaction tube 2. Each discharge treatment area can simultaneously contain the interface provided by the filling enhancement module 6, the liquid film flowing along the surface of the filling enhancement module 6, the upward-moving microbubbles, and the dielectric barrier discharge effect. This allows the wastewater to undergo multi-stage discharge oxidation and gas-liquid mass transfer treatment in sequence during axial flow, which is beneficial to improving the uniformity of discharge effect, the utilization rate of active species, and the overall stability of wastewater treatment.

[0024] In this embodiment, the z-axis is established along the axial direction of the reactor, and the axial coverage area of ​​the i-th grounding electrode along the z-axis is defined as follows. : ; in, and Let the lower and upper positions of the i-th grounding electrode in the axial direction be denoted as and let the axial coverage area of ​​the fill enhancement module 6 corresponding to the i-th grounding electrode in the z-axis direction be . : ; in, and These represent the lower and upper positions of the corresponding filler reinforcement module 6 in the axial direction, respectively, and the axial overlap length between the i-th grounding electrode and the corresponding filler reinforcement module 6. Defined as: ; axial length of the i-th grounding electrode and the axial height of the corresponding filling reinforcement module 6 They are defined as follows: ; ; The axial structural coupling coefficient between the i-th segment grounding electrode and the corresponding filling reinforcement module 6 satisfy: ; and: ≥0.5.

[0025] Obviously, based on the above: when When = 0, it means that there is no effective overlap between the two in the axial direction; when The closer it is to 1, the higher the degree of axial correspondence between the two. When the value is ≥0.5, the segmented discharge region formed by the i-th grounding electrode has an effective spatial overlap with the corresponding filling enhancement module 6 in the axial direction, so that the segmented discharge region simultaneously contains the downward liquid film on the surface of the filling enhancement module 6, the upward microbubbles formed by the microbubble aeration module 7, the filling material interface, and the dielectric barrier discharge effect.

[0026] Specifically, the axial structural coupling coefficient between the i-th grounding electrode and the corresponding filler reinforcement module 6 In this embodiment, the following is selected: ≥0.7.

[0027] In this embodiment, the axial coverage area of ​​the i-th segment discharge region is defined as follows: The axial coverage area of ​​the liquid film within the i-th segment discharge region is: The axial coverage area of ​​the microbubble within the i-th segment discharge region is The axial coupling region within the i-th segment discharge region is formed by the segmented electric field, the filling enhancement module 6, the downward liquid film, and the upward microbubbles. satisfy: ; and: ; set up The axial length is The axial length of the i-th segment discharge region is Then the multi-interface coupling coefficient in the i-th segment discharge region satisfy: ; and: ≥0.5.

[0028] Clearly, based on the above, through the aforementioned functional relationship, each segmented discharge region can form a spatially coupled unit consisting of a segmented electric field, a filling interface, a descending liquid film, and an ascending microbubble. This achieves simultaneous effects of enhanced discharge, enhanced gas-liquid mass transfer, and enhanced multi-interface contact within the same axial treatment region, thereby improving the utilization rate of active species, the efficiency of pollutant degradation, and the stability of continuous operation.

[0029] Specifically, the multi-interface coupling coefficient within the i-th segment discharge region In this embodiment, the following is selected: ≥0.7.

[0030] In an optional embodiment: for a reactor containing n grounded electrodes, an overall axial coupling coefficient can also be used. Characterizing the overall coupling degree of all segmented discharge regions: .

[0031] In this embodiment, the liquid distribution module 5 can be one or more of the following: a transverse liquid distribution manifold, a porous liquid distribution pipe, an annular overflow, a porous liquid distribution plate, or a spray head. The liquid distribution module 5 is located above the filling enhancement module 6, and the liquid outlet of the liquid distribution module 5 is arranged facing the upper end face and / or the outer surface of the filling enhancement module 6, so that the wastewater to be treated forms a continuous liquid film or an intermittent liquid film on the surface of the filling enhancement module 6.

[0032] Obviously, based on the above, the filling enhancement module 6 not only serves as an attachment and flow carrier for the liquid film, but also increases the contact area between the wastewater and the active species in the dielectric barrier discharge zone, allowing the liquid phase to continuously receive discharge oxidation during the flow process, thereby improving the mass transfer efficiency and pollutant degradation effect in the wastewater treatment process.

[0033] In this embodiment, the microbubble aeration module 7 includes a gas distribution chamber and a microporous aeration element. The microporous aeration element can be one or more of the following: perforated aeration plate, microporous aeration plate, microporous ceramic component, sintered metal membrane, porous glass plate or hollow fiber membrane.

[0034] Obviously, based on the above, compared with ordinary large bubble aeration, microbubbles have a larger gas-liquid contact area and a higher interface renewal frequency, which enables the reactant gas and active species generated during the discharge process to enter the liquid film area more fully.

[0035] In this embodiment, the high-voltage electrode assembly 3 can be one of a rod-shaped electrode, a spiral electrode, a spring-shaped electrode, or a tubular electrode; the dielectric reaction tube 2 can be a quartz tube, an alumina ceramic tube, or a glass ceramic tube.

[0036] Specifically, in this embodiment, the high-voltage electrode assembly 3 is selected to be a metal rod-shaped electrode.

[0037] In this embodiment, the filling reinforcement module 6 can be one or more of the following: honeycomb ceramic, structured corrugated filler, porous ceramic block, ceramic ring, quartz particles, sintered quartz particles, glass beads, or glass material filler. The surface of the filling reinforcement module 6 is loaded with a catalytic material, which can be one or more of the following: titanium dioxide, manganese oxide, iron oxide, alumina, or activated carbon.

[0038] Clearly, based on the above, the introduction of catalytic materials can improve the utilization rate of active species and enhance the deep oxidation capacity of organic pollutants. To improve loading stability, the catalytic materials can be fixed to the surface of the filled reinforcement module 6 by coating, impregnation, sintering, or in-situ growth.

[0039] In this embodiment, the wastewater to be treated enters the liquid distribution module 5 through the liquid inlet module 8, forming a liquid film flowing downwards on the surfaces of the two sets of filling enhancement modules 6. The reactant gas enters the microbubble aeration module 7 through the air inlet module 10, forming microbubbles that move upwards along the central rising channel and adjacent filling interfaces. Under the action of the AC high-voltage power supply, a dielectric barrier discharge is formed between the high-voltage electrode assembly 3 and the grounding electrode assembly 4, generating hydroxyl radicals, ozone, hydrogen peroxide, and other reactive oxygen and nitrogen species. Because the liquid film, microbubbles, and filling enhancement modules 6 coexist and work synergistically in each segmented discharge region, the probability of contact between reactive species and pollutants in the wastewater is significantly increased, thereby achieving efficient degradation.

[0040] Example 2: To more clearly illustrate the implementation plan and its effects, we will use the attached diagram as an example: Reference Figure 2 and Figure 3 This refers to a liquid film microbubble-filled coupled wastewater treatment device with a segmented electric field, constructed based on Example 1, with reference to... Figure 4The device also includes a circulating liquid storage module 12 and a tail gas condensation and return module 13. The two ends of the circulating liquid storage module 12 are connected to the liquid inlet module 8 and the liquid outlet module 9 respectively through return pipes. The tail gas condensation and return module 13 is installed on the air inlet pipe of the tail gas emission module 11. The tail gas condensation and return module 13 is equipped with an annular condenser pipe connected to external condensate. The exhaust gas introduced through the air inlet of the tail gas condensation and return module 13 is condensed by the annular condenser pipe and returned to the reactor shell 1 through the liquid outlet of the tail gas condensation and return module 13. In an optional embodiment, the liquid outlet of the tail gas condensation and return module 13 can be connected to the liquid collection module 17 or the circulating liquid storage module 12. In this embodiment, the liquid outlet of the tail gas condensation and return module 13 is connected to the liquid collection module 17 to introduce the liquid into the reactor shell 1, and the air outlet of the tail gas condensation and return module 13 is connected to the tail gas emission module 11.

[0041] Obviously, based on the above: the circulating liquid storage module 12 enables the wastewater discharged from the reactor shell 1 to re-enter the liquid inlet module 8 through the liquid outlet module 9 and the return pipe, thereby realizing the recycling of wastewater. This is suitable for treatment scenarios that require multiple discharge oxidations to improve the degree of degradation. The tail gas condensation and return module 13 is set on the tail gas emission path and condenses and recovers the liquid droplets or condensable components entrained in the tail gas through an internal annular condenser, so that the condensate can be returned to the reactor shell 1 through the liquid collection module 17 or the circulating liquid storage module 12. Therefore, this device can not only extend the effective treatment time of wastewater in the system and improve the degree of pollutant removal, but also reduce the discharge loss of liquid entrained in the tail gas, improve the liquid recovery and utilization rate, and help improve the stability and environmental protection of the device during continuous operation.

[0042] In this embodiment, the circulating liquid storage module 12 includes a liquid storage tank, a circulating pump, and a flow regulating valve. The liquid flows into the liquid storage tank and is powered by the circulating pump. The liquid in the liquid storage tank flows through the online monitoring module 14 and is pumped into the reactor shell 1 by the flow regulating valve. The online monitoring module 14 is used to detect changes in the pH, conductivity, oxidation-reduction potential, temperature, and liquid level of the wastewater in real time.

[0043] Clearly, based on the above, the circulating liquid storage module 12 can form an adjustable circulating liquid supply path through the storage tank, circulating pump, and flow regulating valve, allowing the treated or to-be-treated liquid to circulate between the storage tank and the reactor shell 1, thereby extending the effective treatment time of wastewater and improving the treatment efficiency. Simultaneously, the online monitoring module 14 can acquire real-time operating parameters of the wastewater, such as pH, conductivity, oxidation-reduction potential, temperature, and liquid level, and, in conjunction with the flow regulating valve, adjust the liquid flow rate entering the reactor shell 1, enabling the device to maintain relatively stable operating conditions according to the wastewater state and treatment requirements. This is beneficial for improving the controllability, continuity, and operational stability of the wastewater treatment process, and facilitates adjustments to the circulating treatment process based on real-time water quality changes.

[0044] In this embodiment, the dielectric reaction tube 2 has an inner diameter of 30–100 mm, an outer diameter of 35–120 mm, a length of 200–1000 mm, and a wall thickness of 2–10 mm. The high-voltage electrode assembly 3 has a diameter of 2–20 mm, a length of 150–1000 mm, and is arranged along the axial direction of the dielectric reaction tube 2. The lower end of the high-voltage electrode assembly 3 extends into the processing area corresponding to the filling enhancement module 6, so that the high-voltage electrode assembly 3, the dielectric reaction tube 2, and the grounding electrode assembly 4 together form a dielectric barrier discharge area covering the height range of the filling enhancement module 6.

[0045] The grounding electrode assembly 4 is segmented along the reactor axis, with 3 to 8 segments on each side; the axial length of a single segment electrode is 20 to 200 mm, and the insulation spacing between adjacent segments is 5 to 50 mm. Each segment electrode is arranged in the axial direction corresponding to the height range of the corresponding filling reinforcement module 6, so that liquid film interface, microbubble interface, filling interface, and dielectric barrier discharge effect exist in the discharge area corresponding to each segment electrode.

[0046] The height of the filling enhancement module 6 can be 20–200 mm, the thickness can be 5–80 mm, the pore size can be 0.5–10 mm, the porosity can be 30%–90%, and the specific surface area can be selected according to the wastewater treatment load. Two sets of filling enhancement modules 6 are respectively set on both sides of the medium reaction tube 2, forming a central rising channel with the medium reaction tube 2, and forming two-sided downward liquid film channels with the inner wall of the reactor shell 1.

[0047] The liquid distribution module 5 has a liquid distribution orifice diameter of 0.2–5 mm, a liquid distribution rate of 0.1–10 L / min, a liquid film thickness of 0.1–3 mm, and the liquid film flow rate can be adjusted according to the treated water volume. The microbubble aeration module 7 has a micropore diameter of 1–500 μm, a bubble particle size of 10 μm–3 mm, and a gas flow rate of 0.1–20 L / min. The AC high-voltage power supply has an output voltage of 5–30 kV, a frequency of 1–50 kHz, and a discharge power that can be adjusted according to the reactor size and wastewater treatment load. The wastewater residence time in the reactor can be 1–120 min, the number of cycles can be 1–20, and the continuous treatment time can be determined according to the pollutant concentration and treatment target. The above parameters are only used to illustrate that the present invention can be implemented and do not constitute a limitation on the scope of protection.

Claims

1. A liquid film microbubble-filled coupled wastewater treatment device with a segmented electric field, characterized in that: The reactor includes a reactor shell (1), a medium reaction tube (2) disposed within the reactor shell (1), a high-voltage electrode assembly (3) disposed within the medium reaction tube (2), a grounding electrode assembly (4) disposed on the inner wall of the reactor shell (1) and arranged in segments along the axial direction of the medium reaction tube (2), a liquid distribution module (5) disposed on the upper part of the reactor shell (1), a filling enhancement module (6) disposed between the medium reaction tube (2) and the reactor shell (1), a microbubble aeration module (7) disposed on the lower part of the reactor shell (1), a liquid inlet module (8) connected to the liquid distribution module (5), and a liquid inlet module (8) disposed on the lower part of the reactor shell (1). The reactor consists of a liquid outlet module (9), an air inlet module (10) connected to the microbubble aeration module (7), and a tail gas emission module (11) located on the upper part of the reactor shell (1). The high-voltage electrode assembly (3), the dielectric reaction tube (2), and the grounding electrode assembly (4) together form a dielectric barrier discharge zone. The liquid distribution module (5) is used to distribute the wastewater to be treated above the filling enhancement module (6) and to make the wastewater to be treated form a downward flowing liquid film along the surface of the filling enhancement module (6). The microbubble aeration module (7) is used to disperse the reaction gas into upward moving microbubbles and to make the microbubbles contact the liquid film in the dielectric barrier discharge zone.

2. The wastewater treatment device with segmented electric field and liquid film microbubble filling coupling according to claim 1, characterized in that: The grounding electrode assembly (4) includes multiple segmented electrodes arranged at intervals along the axial direction of the dielectric reaction tube (2). An insulating interval is provided between adjacent segmented electrodes. The axial coverage of each segmented electrode corresponds at least partially to different height segments of the filling enhancement module (6) to form multiple discharge processing areas in the axial direction of the dielectric reaction tube (2) that include the filling enhancement module (6), liquid film, microbubbles and dielectric barrier discharge.

3. The liquid film microbubble filling coupled wastewater treatment device with segmented electric field according to claim 2, characterized in that: Establish the z-axis along the reactor's axial direction, and let the axial coverage area of ​​the i-th grounding electrode along the z-axis be . : ； in, and These represent the lower and upper positions of the i-th grounding electrode in the axial direction, respectively. Let the axial coverage area of ​​the fill enhancement module (6) corresponding to the i-th grounding electrode in the z-axis direction be... : ； in, and These represent the lower and upper positions of the corresponding filler reinforcement module (6) in the axial direction, respectively, and the axial overlap length between the i-th grounding electrode and the corresponding filler reinforcement module (6). Defined as: ； axial length of the i-th grounding electrode and the axial height of the corresponding filler reinforcement module (6) They are defined as follows: ； ； The axial structural coupling coefficient between the i-th grounding electrode and the corresponding filler reinforcement module (6) satisfy: ； and: ≥0.

5.

4. The liquid film microbubble filling coupled wastewater treatment device with segmented electric field according to claim 3, characterized in that: The axial structural coupling coefficient between the i-th grounding electrode and the corresponding filler reinforcement module (6) satisfy: ≥0.

7.

5. The liquid film microbubble filling coupled wastewater treatment device with segmented electric field according to claim 4, characterized in that: Let the axial coverage range of the i-th segment discharge region be . The axial coverage area of ​​the liquid film within the i-th segment discharge region is: The axial coverage area of ​​the microbubble within the i-th segment discharge region is The axial coupling region within the i-th segment discharge region is formed by the segmented electric field, the filling enhancement module (6), the downward liquid film, and the upward microbubbles. satisfy: ； and: ; set up The axial length is The axial length of the i-th segment discharge region is Then the multi-interface coupling coefficient in the i-th segment discharge region satisfy: ； and: ≥0.

5.

6. The liquid film microbubble filling coupled wastewater treatment device with segmented electric field according to claim 5, characterized in that: Multi-interface coupling coefficient within the i-th segment discharge region satisfy: ≥0.

7.

7. The liquid film microbubble filling coupled wastewater treatment device with segmented electric field according to claim 1, characterized in that: The liquid distribution module (5) is one or more of the following: a horizontal liquid distribution manifold, a porous liquid distribution pipe, an annular overflow, a porous liquid distribution plate, or a spray head. The liquid distribution module (5) is located above the filling enhancement module (6), and the liquid outlet of the liquid distribution module (5) is arranged facing the upper end face and / or the outer surface of the filling enhancement module (6) so that the wastewater to be treated forms a continuous liquid film or an intermittent liquid film on the surface of the filling enhancement module (6).

8. The liquid film microbubble filling coupled wastewater treatment device with segmented electric field according to claim 1, characterized in that: The microbubble aeration module (7) includes a gas distribution chamber and a microporous aeration element, wherein the microporous aeration element is one or more of the following: perforated aeration plate, microporous aeration plate, microporous ceramic component, sintered metal membrane, porous glass plate or hollow fiber membrane.

9. The liquid film microbubble filling coupled wastewater treatment device with segmented electric field according to claim 1, characterized in that: The high-voltage electrode assembly (3) is one of a rod-shaped electrode, a spiral electrode, a spring-shaped electrode, or a tubular electrode; the dielectric reaction tube (2) is a quartz tube, an alumina ceramic tube, or a glass ceramic tube.

10. The wastewater treatment device with segmented electric field and liquid film microbubble filling coupling according to claim 1, characterized in that: The filling reinforcement module (6) is one or more of the following: honeycomb ceramic, regular corrugated filler, porous ceramic block, ceramic ring, quartz particles, sintered quartz particles, glass beads or glass material filler. The surface of the filling reinforcement module (6) is loaded with a catalytic material, which is one or more of the following: titanium dioxide, manganese oxide, iron oxide, alumina or activated carbon.

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