Micro-discharge organic wastewater degradation device with electrode and flow channel of same configuration

Abstract

This invention relates to a micro-discharge organic wastewater degradation device with isomorphic electrodes and flow channels, belonging to the field of organic wastewater degradation technology. This invention utilizes a first and second electrode structure adapted to the cross-sectional shape of the microchannel, accurately covering the upper and lower surfaces of the microchannel. This results in high electrode area utilization and significantly improved energy efficiency. The invention employs plasma discharge within millimeter- or micrometer-scale microchannels, resulting in excellent gas-liquid mass transfer, facilitating the discharge reaction, effectively reducing discharge voltage, and lowering energy consumption. Furthermore, the multi-layered microchannel chips arranged from top to bottom, with each layer exhibiting an umbrella-like structure, increase the wastewater treatment capacity. The integrated assembly design and manufacturing of the electrodes and heat sinks ensures effective connection between the stacked electrodes and heat sinks, improving heat transfer efficiency and significantly enhancing the heat dissipation effect of the electrodes.

Description

TECHNICAL FIELD

[0001] The application relates to a micro-discharge organic wastewater degradation device with an electrode and a flow channel, and belongs to the technical field of organic wastewater degradation. BACKGROUND

[0002] At present, common organic wastewater treatment technologies include microbial treatment, advanced oxidation, physical adsorption and the like. However, these traditional degradation technologies have problems such as low treatment efficiency, high energy consumption, complex operation and secondary pollution when treating complex organic wastewater.

[0003] In recent years, plasma micro-discharge technology as a new water treatment technology has attracted widespread attention in the environmental protection field. Micro-discharge technology utilizes a high-voltage electric field to generate plasma micro-discharge in a gas-liquid two-phase microchannel. The high-voltage electric field breaks the liquid and air to generate ionization, and a large amount of active substances (such as hydroxyl radicals and ozone) are generated. The strong oxidizing property of these active substances rapidly degrades macromolecular organic matter in water into low-toxic or non-toxic small molecular substances. Compared with traditional chemical oxidation methods, plasma micro-discharge technology has the advantages of high degradation efficiency, fast reaction speed and wide application range. Therefore, plasma micro-discharge technology has broad application value in organic wastewater degradation. However, the existing plasma oxidation degradation technology still has problems such as low gas-liquid mass transfer intensity, unstable discharge process and low energy utilization rate.

[0004] The invention patent “Treatment method and device for degrading aniline in sewage” (publication number CN105967270B) discloses a treatment method and device for degrading aniline in sewage. The method includes: placing aniline to be treated solution in a water tank, generating a gas-water mixture with a large number of micro-nano bubbles through a micro-bubble generator; and allowing the gas-water mixture to be treated to enter a reactor for discharge treatment. Although this method uses micro-bubble technology to improve the gas-liquid mass transfer effect, it has problems such as uneven micro-nano bubble size, uneven distribution and uncontrollable bubble size, which has limited effect on improving the gas-liquid mass transfer intensity, resulting in low degradation rate and unstable degradation effect.

[0005] The invention patent “Underwater pulse rotating sliding arc low-temperature plasma sewage treatment device” (publication number CN105753107B) discloses an underwater pulse rotating sliding arc low-temperature plasma sewage treatment method and device. Through effective gas-liquid two-phase discharge, the mass transfer of active substances to wastewater molecules is optimized and the energy is effectively utilized, which can be applied to industrial wastewater treatment on a large scale. However, the electrode discharge area of the device is large, the electrode generates a lot of heat during discharge, and the energy utilization rate is low.

[0006] The existing micro-discharge organic wastewater degradation device and method still have problems in practical application, such as a low-temperature plasma reactor and a dye wastewater treatment method shown in CN117164056A. Although the low-temperature plasma reactor generates a large number of high-energy electrons for degrading wastewater during discharge, there are still problems as follows: (1) the gas-liquid mixing effect in micro-discharge is poor, which makes it difficult to further improve the degradation rate; (2) the energy utilization rate is low, and the existing device usually uses electrodes for discharge, which has a large area, resulting in high energy consumption of the device and unstable heat dissipation.

[0007] In view of the problems of poor gas-liquid mixing effect, low energy utilization rate, and high discharge voltage in the existing micro-discharge organic wastewater degradation device and method, the present application provides a micro-discharge organic wastewater degradation device and method with the same structure of electrodes and flow channels. A large number of micro-bubbles are generated in the micro-channel chip to make the micro-bubbles and organic wastewater fully mixed, which can significantly improve the mass transfer effect of gas-liquid. The discharge area is fully utilized by designing the discharge electrode to be completely consistent with the micro-channel configuration and size, which effectively improves the energy utilization rate. The plasma discharge in the micron-scale micro-channel can effectively reduce the discharge voltage and energy consumption. SUMMARY

[0008] To solve the above problems, in a first aspect, the present application provides a micro-discharge organic wastewater degradation device with the same structure of electrodes and flow channels, which comprises an injection pump, an air pump, a gas flow meter, a power supply, a liquid storage tank, a liquid flow meter, and a micro-channel micro-discharge degradation module with heat dissipation function. The micro-channel micro-discharge degradation module comprises a first micro-channel micro-discharge degradation device, a second micro-channel micro-discharge degradation device, and a third micro-channel micro-discharge degradation device connected in sequence. The first, second, and third micro-channel micro-discharge degradation devices are provided with the power supply and connected with the air pump and the gas flow meter. The first micro-channel micro-discharge degradation device is connected with the injection pump, and the third micro-channel micro-discharge degradation device is connected with the liquid storage tank. The liquid flow meter is arranged between the first and second micro-channel micro-discharge degradation devices and between the second and third micro-channel micro-discharge degradation devices.

[0009] The injection pump and the air pump drive wastewater and air into the micro-channel micro-discharge degradation module, respectively, and the wastewater is degraded by the first, second, and third micro-channel micro-discharge degradation devices in sequence. The flow rates of air and wastewater into the micro-channel micro-discharge degradation module are adjusted by the gas flow meter and the liquid flow meter. The liquid storage tank is used to store the degraded wastewater.

[0010] Further, the first micro-channel micro-discharge degradation device, the second micro-channel micro-discharge degradation device, and the third micro-channel micro-discharge degradation device have the same structure, the first micro-channel micro-discharge degradation device comprises, from top to bottom, a top heat sink, a plurality of stacked micro-discharge structures, a bottom heat sink, and a support base, the support base has a plurality of support columns, and the top heat sink and the bottom heat sink are fixed to the support columns by fastening bolts; the micro-discharge structure comprises, in sequence, a first electrode, a micro-channel chip, a second electrode, a disc heat sink, and an I-shaped sleeve penetrating the disc heat sink.

[0011] Further, the first electrode and the second electrode are respectively embedded in the upper surface groove and the lower surface groove of the micro-channel chip to ensure the position of the first electrode and the second electrode in the micro-discharge structure; the top heat sink has annular heat dissipation blades with a ring structure and a heat absorption plate connected to the annular heat dissipation blades, and the heat absorption plate is limited in the upper surface groove of the micro-channel chip; the bottom heat sink has the same structure as the top heat sink and is limited in the lower surface groove of the micro-channel chip.

[0012] Further, the first electrode and the second electrode have the same structure and both have an electrode structure composed of a plurality of central radiating curves, the micro-channel chip is engraved with a micro-channel structure having a radial distribution corresponding to the electrode structure, the polarities of the first electrode and the second electrode in adjacent two micro-discharge structures are completely opposite, for example, the first electrode and the second electrode in the first micro-discharge structure are respectively set to positive and negative, the first electrode and the second electrode in the second micro-discharge structure connected below the second electrode of the first micro-discharge structure are respectively set to negative and positive, the first electrode and the second electrode in the third micro-discharge structure connected below the second electrode of the second micro-discharge structure are respectively set to positive and negative, and so on, the electrode order from top to bottom is "positive, negative, negative, positive, positive, negative, …" or "negative, positive, positive, negative, negative, positive, …".

[0013] Further, the central radiating curve shape of the first electrode and the second electrode is completely the same as the cross-sectional shape of the micro-channel structure; the first electrode and the second electrode are respectively fixed on the upper and lower surfaces of the micro-channel structure and accurately cover the micro-channel structure; the micro-channel structure has a micro-channel with a millimeter or micrometer scale that can generate plasma discharge, allowing the micro-channel to break down air and achieve discharge at a lower voltage, and the gas-liquid mass transfer intensity in the micro-channel is higher, which can effectively promote the degradation of organic pollutants.

[0014] Further, the disc-shaped heat sink is a disc-shaped structure composed of an upper heat absorption plate and a lower heat absorption plate, and a plurality of heat dissipation through holes are arranged between the upper heat absorption plate and the lower heat absorption plate; the upper heat absorption plate and the lower heat absorption plate are respectively embedded between two adjacent micro-channel chips, so as to position the disc-shaped heat sink as a whole; the upper heat absorption plate and the lower heat absorption plate are completely attached to the second electrode and the first electrode connected with the two adjacent micro-channel chips, and are fixed in the lower surface groove and the upper surface groove of the two adjacent micro-channel chips; the heat generated by the second electrode and the first electrode can be transferred to the heat dissipation through holes and carried away along the air flow direction through the heat dissipation through holes.

[0015] Further, the I-shaped sleeve includes an upper spacer, an intermediate spacer and a lower spacer connected in sequence, the upper spacer is embedded in the inner ring of the second electrode, the upper surface of the upper spacer is attached to the micro-channel chip, and the lower surface of the upper spacer is attached to the disc-shaped heat sink; the lower spacer is embedded in the inner ring of the first electrode of the adjacent micro-discharge structure, the upper surface of the lower spacer is attached to the top heat sink of the adjacent micro-discharge structure, and the lower surface of the lower spacer is attached to the micro-channel chip of the adjacent micro-discharge structure; the cooperation part of the upper spacer and the lower spacer with the second electrode and the first electrode isolates the outlet of the micro-channel chip from the first electrode and the second electrode, and the inside of the I-shaped sleeve is in a sealed state.

[0016] In an embodiment of the present application, the outer periphery of the upper surface groove and the lower surface groove of the micro-channel chip is provided with a circumferential stop ring.

[0017] In an embodiment of the present application, the first electrode and the second electrode are both provided with a pin connected with the power supply, the pin is positioned in cooperation with the notch of the circumferential stop ring, so as to ensure that the first electrode and the second electrode will not be dislocated with the micro-channel structure of the micro-channel chip and will not rotate relatively.

[0018] In a second aspect, the present application also provides a micro-discharge organic wastewater degradation method with electrode and flow channel isomorphic, which adopts the micro-discharge organic wastewater degradation device with electrode and flow channel isomorphic, and the method includes the following steps:

[0019] Step one: turn on the injection pump, adjust the wastewater inlet flow, turn off the air pump, so that the wastewater enters the first micro-channel micro-discharge degradation device, the second micro-channel micro-discharge degradation device and the third micro-channel micro-discharge degradation device in sequence, and adjust the liquid flow meter in the process;

[0020] Step two: open the air pump, make the gas enter the first microchannel micro-discharge degradation device, the second microchannel micro-discharge degradation device, the third microchannel micro-discharge degradation device in turn, and continue to adjust the liquid flow meter and the gas flow meter, so that the gas-liquid two-phase generates bubbles in the microchannel structure in the microchannel chip;

[0021] Step three: open the cooling fan, so that the air direction is towards the heat dissipation through hole on the disc heat sink, to accelerate the air flow, and take away the heat generated by the discharge on the first electrode and the second electrode through the disc heat sink;

[0022] Step four: turn on the power supply, adjust the discharge voltage and power, so that the first electrode and the second electrode stably discharge in the micro-discharge degradation device;

[0023] Step five: use spectrophotometry to detect the degraded wastewater in the liquid storage tank, and adjust the discharge voltage in real time according to the removal rate of organic wastewater, so as to realize efficient degradation of wastewater;

[0024] Further, the injection pump, liquid flow meter and gas flow meter in steps one and two are provided with a plurality of numbers and working parameters, which are set according to the number of layers of the microchannel chip and the number of degradation stages, so that the gas-liquid two-phase can smoothly enter the microchannel and form a plug flow of bubbles, and the degradation efficiency is ensured;

[0025] The cooling fan in step three can make the air flow through the heat dissipation through hole of the disc heat sink, take away the heat generated by the discharge of the second electrode and the first electrode, prevent the second electrode and the first electrode from being too high in temperature, and avoid the premature decomposition of hydroxyl radicals and ozone, thereby reducing the degradation efficiency;

[0026] The discharge voltage and power in step four are the discharge voltage and power for degrading the wastewater in one layer of microchannels;

[0027] The degraded wastewater in the liquid storage tank in step five is connected back to the injection pump in step one to form a circulating degradation device, further improving the wastewater degradation efficiency.

[0028] The beneficial effects of the present application are:

[0029] (1) The present application sets the first electrode and the second electrode structure which is adapted to the shape of the microchannel cross section, and accurately covers the electrode on the upper and lower surfaces of the microchannel, so that the electrode area utilization rate is high, and the electric energy is used for the plasma discharge process, thereby significantly improving the energy utilization rate.

[0030] (2) The present application adopts millimeter or micrometer scale microchannels to carry out upper and lower surface plasma discharge, the gas-liquid mass transfer effect in the microchannels is good, the discharge reaction is facilitated, the discharge voltage can be effectively reduced, the energy consumption is reduced, and through the arrangement of multiple layers of microchannel chips from top to bottom, the microchannels of each layer are distributed in an umbrella shape on the chip, and the treatment capacity of wastewater degradation is improved.

[0031] (3) The present application is manufactured through the integral assembly design of the electrode and the heat sink, so that the electrode and the heat sink are effectively connected in a stacked manner, the heat transfer efficiency between the electrode and the heat sink is improved, and the overheating phenomenon of the electrode caused by long-time work is avoided.

[0032] (4) The present application realizes multi-stage continuous degradation through the cascade of multiple microchannel micro-discharge degradation devices, collects multiple outlets as the inlet of the next stage, and reduces the discharge voltage with the degradation of the pollutant concentration of the wastewater, thereby improving the energy utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure in an embodiment of the present application.

[0034] Figure 2 It is a schematic diagram of the structure of the first microchannel micro-discharge degradation device in an embodiment of the present application.

[0035] Figure 3 It is an exploded view of the micro-discharge structure in an embodiment of the present application.

[0036] Figure 4 It is a sectional view of the first microchannel micro-discharge degradation device in an embodiment of the present application.

[0037] Figure 5 It is Figure 4 The local enlarged view circled in the figure.

[0038] Figure 6 It is a schematic diagram of the structure of the first electrode or the second electrode in an embodiment of the present application.

[0039] Figure 7 It is a schematic diagram of the structure of the disc heat sink in an embodiment of the present application.

[0040] Figure 8 It is a schematic diagram of the structure of the I-shaped sleeve in an embodiment of the present application.

[0041] Figure 9 It is a schematic diagram of the structure of the microchannel chip and the electrode installation in an embodiment of the present application.

[0042] Figure 10 It is a top view of the microchannel structure in an embodiment of the present application.

[0043] Figure 11 A flow chart of a micro-discharge organic wastewater degradation method with an electrode and a flow channel.

[0044] In the figure, 1, injection pump; 2, air pump; 3, gas flow meter; 4, power supply; 5, liquid storage tank; 6, liquid flow meter; 7, micro-channel micro-discharge degradation module; 71, fastening bolt; 72, top heat sink; 73, micro-discharge structure; 731, first electrode; 731-1, pin; 732, second electrode; 733, micro-channel chip; 733-1, circumferential stop ring; 733-2, upper surface groove; 733-3, lower surface groove; 734, disc heat sink; 734-1, upper heat absorption plate; 734-2, heat dissipation through hole; 734-3, lower heat absorption plate; 735, I-shaped sleeve; 735-1, upper spacer sleeve; 735-2, middle spacer sleeve; 735-3, lower spacer sleeve; 74, bottom heat sink; 75, support base. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0046] In the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the present application, the "first", "second" are only used to distinguish the same type of components / parts in different positions or different characteristics, and have no other limited meanings; the "upper" refers to the direction of each component away from the ground, and the "lower" refers to the direction of each component away from the ground.

[0048] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0049] Embodiment 1

[0050] As Figures 1-10 shown, the present application provides a micro-discharge organic wastewater degradation device with electrode and flow channel isomorphic shape, comprising: a syringe pump 1, a gas pump 2, a gas flow meter 3, a power supply 4, a liquid storage tank 5, a liquid flow meter 6, a micro-channel micro-discharge degradation module 7 with heat dissipation function, the micro-channel micro-discharge degradation module 7 comprises a first micro-channel micro-discharge degradation device, a second micro-channel micro-discharge degradation device and a third micro-channel micro-discharge degradation device connected in sequence, the first micro-channel micro-discharge degradation device, the second micro-channel micro-discharge degradation device and the third micro-channel micro-discharge degradation device are all provided with the power supply 4 and are all connected with the gas pump 2 and the gas flow meter 3, the first micro-channel micro-discharge degradation device is connected with the syringe pump 1, the third micro-channel micro-discharge degradation device is connected with the liquid storage tank 5, and the liquid flow meter 6 is arranged between the first micro-channel micro-discharge degradation device and the second micro-channel micro-discharge degradation device and between the second micro-channel micro-discharge degradation device and the third micro-channel micro-discharge degradation device.

[0051] The syringe pump 1 and the gas pump 2 respectively drive wastewater and air into the micro-channel micro-discharge degradation module 7, and the wastewater is sequentially degraded by the first micro-channel micro-discharge degradation device, the second micro-channel micro-discharge degradation device and the third micro-channel micro-discharge degradation device; the flow rates of the air and the wastewater entering the micro-channel micro-discharge degradation module 7 are adjusted by the gas flow meter 3 and the liquid flow meter 6; and the liquid storage tank 5 is used for storing the degraded wastewater.

[0052] Further, the first micro-channel micro-discharge degradation device, the second micro-channel micro-discharge degradation device and the third micro-channel micro-discharge degradation device have the same structure, and the first micro-channel micro-discharge degradation device comprises, from top to bottom, a top heat sink 72, a plurality of micro-discharge structures 73 arranged in layers, a bottom heat sink 74 and a support base 75, wherein the support base has a plurality of support columns, and the top heat sink 72 and the bottom heat sink 74 are fixed to the support columns by fastening bolts 71; the micro-discharge structure 73 comprises, in sequence, a first electrode 731, a micro-channel chip 733, a second electrode 732, a disc heat sink 734 and an I-shaped sleeve 735 penetrating the disc heat sink 734.

[0053] Further, the first electrode 731 and the second electrode 732 are respectively embedded in the upper surface groove 733-2 and the lower surface groove 733-3 of the micro-channel chip 733, so as to ensure the position of the first electrode 731 and the second electrode 732 in the micro-discharge structure 73; the top heat sink 72 has annular heat dissipation blades with a ring structure and a heat absorption plate connected to the annular heat dissipation blades, and the heat absorption plate is limited in the upper surface groove 733-2 of the micro-channel chip 733; the bottom heat sink 74 has the same structure as the top heat sink 72 and is limited in the lower surface groove 733-3 of the micro-channel chip 733.

[0054] Further, the first electrode 731 and the second electrode 732 have the same structure and each has an electrode structure composed of a plurality of central radiating curves, the micro-channel chip 733 is engraved with a micro-channel structure having a radial distribution corresponding to the electrode structure, and the polarities of the first electrode 731 and the second electrode 732 in two adjacent micro-discharge structures 73 are completely opposite, for example, the first electrode 731 and the second electrode 732 of the first micro-discharge structure 73 are respectively set to positive and negative, the first electrode and the second electrode of the second micro-discharge structure 73 connected below the second electrode of the first micro-discharge structure 73 are respectively set to negative and positive, the first electrode and the second electrode of the third micro-discharge structure 73 connected below the second electrode of the second micro-discharge structure 73 are respectively set to positive and negative, and so on, and the electrode order from top to bottom is “positive, negative, negative, positive, positive, negative……” or “negative, positive, positive, negative, negative, positive……”. Figure 4

[0055] ​Further, the center radiation curve shape of the first electrode 731 and the second electrode 732 is completely same as the cross-sectional shape of the micro-channel structure; the first electrode 731 and the second electrode 732 are respectively fixed on the upper and lower surfaces of the micro-channel structure, and accurately cover the micro-channel structure; the micro-channel structure has a millimeter or micron scale micro-channel capable of plasma discharge, allowing the micro-channel to break down air at a lower voltage to achieve discharge, and the gas-liquid mass transfer intensity in the micro-channel is higher, which can effectively promote the degradation of organic pollutants; the discharge gap of the first electrode 731 and the second electrode 732 is controlled to be 2-3 mm.

[0056] Further, the disc-shaped heat sink 734 is a disc-shaped structure composed of an upper heat absorption plate 734-1 and a lower heat absorption plate 734-3, and a plurality of heat dissipation through holes 734-2 are further arranged between the upper heat absorption plate 734-1 and the lower heat absorption plate 734-3; the upper heat absorption plate 734-1 and the lower heat absorption plate 734-3 are respectively embedded between the adjacent two micro-channel chips 733, so as to position the whole disc-shaped heat sink 734; the upper heat absorption plate 734-1 and the lower heat absorption plate 734-3 are completely fixed with the second electrode 732 and the first electrode 731 connected with the adjacent two micro-channel chips 733, and are fixed in the lower surface groove 733-3 and the upper surface groove 733-2 of the adjacent two micro-channel chips 733; the heat generated by the second electrode 732 and the first electrode 731 can be transferred to the heat dissipation through holes 734-2, and the heat is carried away along the air flow direction through the heat dissipation through holes 734-2.

[0057] Further, the I-shaped sleeve 735 includes an upper spacer sleeve 735-1, an intermediate spacer sleeve 735-2 and a lower spacer sleeve 735-3 connected in sequence, the upper spacer sleeve 735-1 is embedded in the inner ring of the second electrode 732, the upper surface of the upper spacer sleeve 735-1 is attached to the micro-channel chip 733, and the lower surface of the upper spacer sleeve 735-1 is attached to the disc-shaped heat sink 734; the lower spacer sleeve 735-3 is embedded in the inner ring of the first electrode 731 of the adjacent micro-discharge structure 73, the upper surface of the lower spacer sleeve 735-3 is attached to the top heat sink 72 of the adjacent micro-discharge structure 73, and the lower surface of the lower spacer sleeve 735-3 is attached to the micro-channel chip 733 of the adjacent micro-discharge structure 73; the upper spacer sleeve 735-1 and the lower spacer sleeve 735-3 cooperate with the second electrode 732 and the first electrode 731 to isolate the outlet of the micro-channel chip 733 from the first electrode 731 and the second electrode 732, and the inside of the I-shaped sleeve 735 is in a sealed state.

[0058] The outer periphery of the upper surface groove 733-2 and the lower surface groove 733-3 of the micro-channel chip 733 is provided with a circumferential stop ring 733-1.

[0059] The first electrode 731 and the second electrode 732 are provided with a pin 731-1 connected with the power supply 4, which is positioned in cooperation with the notch of the circumferential stop ring 733-1, so as to ensure that the first electrode 731 and the second electrode 732 will not be dislocated and will not be relatively rotated with the micro-channel structure of the micro-channel chip 733.

[0060] Embodiment 2

[0061] A micro-discharge organic wastewater degradation method with electrode and flow channel isomorphic, which adopts the micro-discharge organic wastewater degradation device with electrode and flow channel isomorphic as described in Embodiment 1, and the method comprises the following steps:

[0062] Step one: turn on the injection pump 1, adjust the flow to 60 mL / min, turn off the air pump 2, so that the wastewater enters the first micro-channel micro-discharge degradation device, and then adjust the liquid flow meter 6 so that the wastewater can enter the second and third micro-channel micro-discharge degradation devices, and finally enter the liquid storage tank 5;

[0063] Step two: turn on the air pump 2, so that the gas enters the first micro-channel micro-discharge degradation device, the second micro-channel micro-discharge degradation device, and the third micro-channel micro-discharge degradation device in sequence, while continuing to adjust the flow of the liquid flow meter 6 to 60 mL / min and the flow of the gas flow meter to 15 mL / min, so that the gas-liquid two-phase generates bubbles in the micro-channel structure of the micro-channel chip 733;

[0064] Step three: turn on the cooling fan, so that the air direction is towards the cooling through holes 734-2 on the disc cooling fin 734, so as to accelerate the air flow and take away the heat generated by the discharge on the first electrode 731 and the second electrode 732 through the disc cooling fin 734;

[0065] Step four: turn on the power supply 4, adjust the discharge voltage to 4 kV, and control the discharge power to be 70 W, so that the first electrode 731 and the second electrode 732 stably discharge in the micro-discharge degradation device;

[0066] Step five: use the spectrophotometric method to detect the degraded wastewater in the liquid storage tank 5, and adjust the discharge voltage in real time according to the removal rate of the organic wastewater, so as to realize the efficient degradation of the wastewater.

[0067] The injection pump 1, the liquid flow meter 6 and the gas flow meter 3 in the steps one and two are provided with a plurality of numbers and working parameters, which are set according to the layer number of the micro-channel chip 733 and the degradation level, so that the gas-liquid two-phase can smoothly enter the micro-channel and form the plunger flow of the gas bubble, and the degradation efficiency is ensured; wherein the degradation level is equivalent to the number of the micro-channel micro-discharge degradation device;

[0068] The heat dissipation fan in the step three can make the air flow through the heat dissipation through hole 734-2 of the disc heat dissipation fin 734, and take away the heat generated by the discharge of the second electrode 732 and the first electrode 731, so as to prevent the second electrode 732 and the first electrode 731 from being too high in temperature, thereby avoiding the self-degradation of the hydroxyl radical and ozone in advance; if the temperature of the first electrode 731 and the second electrode 732 is too high, the discharge is stopped, and the heat is completely dissipated;

[0069] The discharge voltage of 4 kV and the discharge power of 70 W in the step four are the discharge voltage and power for degrading the wastewater in one layer of the micro-channel chip;

[0070] The degraded wastewater in the liquid storage tank 5 in the step five is connected back to the injection pump 1 in the step one, so as to form a circulating degradation device, and the wastewater degradation efficiency is further improved.

[0071] Finally, the methylene blue solution of 0.1 mmol / L is used for testing, and the degradation rate of 67% can be achieved after the micro-discharge in the micro-discharge structure 73 for 6 minutes.

[0072] Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make various modifications and modifications without departing from the spirit and scope of the present application, therefore the protection scope of the present application should be defined by the claims.

Claims

1. A micro-discharge organic wastewater degradation device with isomorphic electrodes and flow channels, characterized in that, include: The system includes an injection pump (1), an air pump (2), a gas flow meter (3), a power supply (4), a liquid storage tank (5), a liquid flow meter (6), and a microchannel micro-discharge degradation module (7) with heat dissipation function. The microchannel micro-discharge degradation module (7) includes a first microchannel micro-discharge degradation device, a second microchannel micro-discharge degradation device, and a third microchannel micro-discharge degradation device connected in sequence. The first microchannel micro-discharge degradation device, the second microchannel micro-discharge degradation device, and the third microchannel micro-discharge degradation device are all equipped with the power supply (4) and are all connected to the air pump (2) and the gas flow meter (3). The first microchannel micro-discharge degradation device is connected to the injection pump (1), and the third microchannel micro-discharge degradation device is connected to the liquid storage tank (5). The liquid flow meter (6) is provided between the first microchannel micro-discharge degradation device and the second microchannel micro-discharge degradation device, and between the second microchannel micro-discharge degradation device and the third microchannel micro-discharge degradation device. The injection pump (1) and air pump (2) drive wastewater and air into the microchannel micro-discharge degradation module (7) respectively, and the wastewater is degraded sequentially by the first microchannel micro-discharge degradation device, the second microchannel micro-discharge degradation device, and the third microchannel micro-discharge degradation device; the flow rate of air and wastewater entering the microchannel micro-discharge degradation module (7) can be adjusted by the gas flow meter (3) and the liquid flow meter (6); The first microchannel microdischarge degradation device includes a top heat sink (72), several layers of stacked microdischarge structures (73), a bottom heat sink (74), and a support base (75) connected sequentially from top to bottom. The support base has multiple support columns, and the top heat sink (72) and the bottom heat sink (74) are both fixed to the support columns by fastening bolts (71). The microdischarge structure (73) includes a first electrode (731), a microchannel chip (733), a second electrode (732), a disk heat sink (734), and an I-beam sleeve (735) passing through the disk heat sink (734) connected sequentially. The first electrode (731) and the second electrode (732) have the same structure and both have an electrode structure composed of multiple centrally radiating curves. The microchannel chip (733) has microchannel structures with a radial distribution corresponding to the electrode structure. The polarity settings of the first electrode (731) and the second electrode (732) in two adjacent microdischarge structures (73) are completely opposite. The shape of the central radiating curve of the first electrode (731) and the second electrode (732) is exactly the same as the cross-sectional shape of the microchannel structure. The first electrode (731) and the second electrode (732) are respectively fixed on the upper and lower surfaces of the microchannel structure and accurately cover the microchannel structure. The microchannel structure has millimeter- or micrometer-scale microchannels capable of performing plasma discharge.

2. The micro-discharge organic wastewater degradation device with isomorphic electrodes and flow channels according to claim 1, characterized in that, The first microchannel microdischarge degradation device, the second microchannel microdischarge degradation device, and the third microchannel microdischarge degradation device have the same structure.

3. The micro-discharge organic wastewater degradation device with isomorphic electrodes and flow channels according to claim 2, characterized in that, The first electrode (731) and the second electrode (732) are respectively embedded in the upper surface groove (733-2) and the lower surface groove (733-3) of the microchannel chip (733) to ensure that the first electrode (731) and the second electrode (732) are positioned in the micro-discharge structure (73); the top heat sink (72) has a ring-shaped heat dissipation blade with a layered structure and a heat absorption plate connected to the ring-shaped heat dissipation blade, and the heat absorption plate is limited to the upper surface groove (733-2) of the microchannel chip (733); the bottom heat sink (74) has the same structure as the top heat sink (72) and is limited to the lower surface groove (733-3) of the microchannel chip (733).

4. The micro-discharge organic wastewater degradation device with isomorphic electrodes and flow channels according to claim 3, characterized in that, The disc heat sink (734) is a disc-shaped structure composed of an upper heat absorption plate (734-1) and a lower heat absorption plate (734-3). Multiple heat dissipation through holes (734-2) are provided between the upper heat absorption plate (734-1) and the lower heat absorption plate (734-3). The upper heat absorption plate (734-1) and the lower heat absorption plate (734-3) are respectively embedded between two adjacent microchannel chips (733), thereby positioning the disc heat sink (734) as a whole. The upper heat absorption plate (734-1) and the lower heat absorption plate... (734-3) The second electrode (732) and the first electrode (731) connected to the two adjacent microchannel chips (733) are fully attached and fixed in the lower surface groove (733-3) and upper surface groove (733-2) of the two adjacent microchannel chips (733). The heat generated by the second electrode (732) and the first electrode (731) can be transferred to the heat dissipation through hole (734-2) and carried away along the air flow direction through the heat dissipation through hole (734-2).

5. The micro-discharge organic wastewater degradation device with isomorphic electrodes and flow channels according to claim 4, characterized in that, The I-shaped sleeve (735) includes an upper spacer (735-1), a middle spacer (735-2), and a lower spacer (735-3) connected in sequence. The upper spacer (735-1) is embedded in the inner ring of the second electrode (732), and the upper surface of the upper spacer (735-1) is in contact with the microchannel chip (733). The lower surface of the upper spacer (735-1) is in contact with the disk heat sink (734). The lower spacer (735-3) is embedded in the inner ring of the first electrode (731) of the adjacent micro-discharge structure (73). The upper surface of the upper spacer (735-1) is attached to the top heat sink (72) of the adjacent micro discharge structure (73), and the lower surface of the lower spacer (735-3) is attached to the microchannel chip (733) of the adjacent micro discharge structure (73). The cooperation between the upper spacer (735-1), the lower spacer (735-3) and the second electrode (732) and the first electrode (731) isolates the outlet of the microchannel chip (733) from the first electrode (731) and the second electrode (732), and the interior of the I-shaped sleeve (735) is sealed.

6. The micro-discharge organic wastewater degradation device with isomorphic electrode and flow channel as described in claim 5, characterized in that, The microchannel chip (733) has a circumferential retaining ring (733-1) on the outer periphery of both the upper surface groove (733-2) and the lower surface groove (733-3).

7. The micro-discharge organic wastewater degradation device with isomorphic electrodes and flow channels according to claim 6, characterized in that, The first electrode (731) and the second electrode (732) are both provided with pins (731-1) that are connected to the power supply (4). The pins (731-1) are positioned in conjunction with the slot of the circumferential retaining ring (733-1) to ensure that the first electrode (731) and the second electrode (732) will not be misaligned with the microchannel structure of the microchannel chip (733) and will not rotate relative to each other.

8. A method for degrading organic wastewater with isomorphic electrodes and flow channels, employing the micro-discharge organic wastewater degradation device with isomorphic electrodes and flow channels as described in any one of claims 1-7, characterized in that, The method includes the following steps: Step 1: Turn on the injection pump (1), adjust the wastewater inlet flow rate, and turn off the air pump (2) so that the wastewater enters the first microchannel micro-discharge degradation device, the second microchannel micro-discharge degradation device, and the third microchannel micro-discharge degradation device in sequence. Adjust the liquid flow meter (6) during the process. Step 2: Turn on the air pump (2) to allow the gas to enter the first microchannel micro-discharge degradation device, the second microchannel micro-discharge degradation device, and the third microchannel micro-discharge degradation device in sequence. At the same time, continue to adjust the liquid flow meter (6) and the gas flow meter (3) so that the gas and liquid phases generate bubbles in the microchannel structure of the microchannel chip (733). Step 3: Turn on the cooling fan so that the airflow is directed toward the heat dissipation holes (734-2) on the disc heat sink (734) to accelerate the airflow and carry away the heat generated by the discharge on the first electrode (731) and the second electrode (732) through the disc heat sink (734); Step 4: Turn on the power supply (4), adjust the discharge voltage and power to make the first electrode (731) and the second electrode (732) discharge stably in the micro-discharge degradation device; Step 5: Use spectrophotometry to detect the degraded wastewater in the storage tank (5), and adjust the discharge voltage in real time according to the removal rate of organic wastewater to achieve efficient degradation of wastewater.

9. The method for degrading organic wastewater with isomorphic electrodes and flow channels according to claim 8, characterized in that, In steps one and two, multiple injection pumps (1), liquid flow meters (6) and gas flow meters (3) are provided. Their quantity and operating parameters are set according to the number of layers of the microchannel chip (733) and the number of degradation stages, so that the gas and liquid phases can smoothly enter the microchannel and form a plunger flow of bubbles, ensuring degradation efficiency. In step three, the cooling fan can make air flow through the heat dissipation holes (734-2) of the disc heat sink (734), and carry away the heat generated by the discharge of the second electrode (732) and the first electrode (731), so as to avoid the phenomenon that the second electrode (732) and the first electrode (731) decompose prematurely due to excessive temperature. The discharge voltage and power in step four are the discharge voltage and power for degrading wastewater in a layer of microchannels. In step five, the degraded wastewater in the storage tank (5) is reconnected to the injection pump (1) in step one to form a circulating degradation device, which further improves the wastewater degradation efficiency.

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