A multi-electrode parallel liquid plasma sewage treatment device

Abstract

The invention relates to a multi-electrode side-by-side liquid-phase plasma sewage treatment device, comprising a horizontal sewage container, a microwave source and a microwave conduit, wherein the sewage container comprises an upper gas collecting chamber and a lower sewage chamber, the top of the gas collecting chamber is connected to an exhaust pipe; a partition plate is arranged in the sewage chamber to divide the sewage chamber into an upper and lower part; a plurality of protrusions are arranged on at least two opposite sides of the sewage chamber, an upper and lower discharge electrode are arranged in the protrusion, and the partition plate extends into the protrusion to separate the two discharge electrodes; the microwave conduit is connected to the energy outlet of the microwave source and is connected in parallel with a plurality of protrusions to excite the discharge electrode to discharge and generate plasma; a plurality of baffles are arranged in the sewage chamber, so that the sewage in the upper part and the lower part of the sewage chamber flows along the baffles respectively.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a multi-electrode side-by-side liquid plasma sewage treatment device. Background Art

[0002] Using plasma generated in liquid to treat sewage is a new treatment method. The plasma in the liquid phase contains a large number of active particles, such as OH, O, and H free radicals, especially OH free radicals, which have a high redox potential and are an oxidant that can effectively degrade pollutants, especially organic pollutants. Plasma treatment of sewage takes a short time and has good effects. At present, most of the devices that use plasma to treat sewage are vertical tubular, which is conducive to the generation of plasma by the discharge electrode. Since it is necessary to maintain a suitable vacuum degree in the sewage container, a batch method is generally used. Therefore, the amount of sewage treated each time is small, which has become a bottleneck problem for the industrial application of plasma sewage treatment. Summary of the invention

[0003] In view of the above problems, the present invention provides a multi-electrode side-by-side liquid plasma sewage treatment device, comprising a horizontal sewage container, at least one microwave source and a microwave guide tube, the sewage container comprising a gas collecting chamber and a sewage chamber, the gas collecting chamber is located above the sewage chamber, the top of the gas collecting chamber is connected to an exhaust pipe for maintaining the vacuum degree in the sewage container; a partition plate is provided in the middle of the sewage chamber to divide the sewage chamber into an upper and a lower part;

[0004] At least two opposite sides of the sewage chamber are provided with a plurality of protrusions, and two upper and lower discharge electrodes are provided in the protrusions. A partition plate extends into the protrusions to separate the two discharge electrodes. One end of the microwave conduit is connected to a microwave source, and the other end is connected in parallel to the plurality of protrusions. The microwave energy is transmitted to the protrusions through the microwave conduit and directly coupled to the sewage container to excite the discharge electrode to discharge and generate plasma.

[0005] A number of baffles are provided in the sewage chamber, the bottom of the baffle is fixed on the bottom surface of the sewage chamber, the top of the baffle is higher than the liquid level of the sewage chamber, one end of the baffle is fixedly connected to the side of the sewage chamber, and the other end points to the protrusion of the opposite side, and two adjacent baffles are respectively fixed on the opposite sides, so that the sewage in the upper and lower parts of the sewage chamber flow along the baffles respectively.

[0006] Optionally, the sewage chamber is square, the bottom surface of the air collecting chamber coincides with the top surface of the sewage chamber, the air collecting chamber is connected to the internal space of the sewage chamber, the air collecting chamber is a cone with a larger bottom and a smaller top, and the exhaust pipe is connected to an external vacuum pump.

[0007] Optionally, the two opposite long sides of the sewage chamber are a first long side and a second long side, and a plurality of protrusions are evenly arranged on the first long side and the second long side; the protrusions on the first long side and the second long side do not correspond to each other in the width direction of the sewage chamber and are staggered with each other;

[0008] A plurality of baffles are evenly arranged in the sewage chamber along the length direction, the baffles are parallel to the wide side of the sewage chamber, the fixed end of the baffle is fixedly connected to a long side of the sewage chamber, the other end is a free end and points to the discharge electrode in the protrusion of the opposite long side, and a gap is left between the free end and the corresponding long side, allowing the sewage in the sewage chamber to flow to the next baffle through the gap; the fixed ends of two adjacent baffles are fixed on two opposite long sides, and a sewage channel is formed between the two adjacent baffles;

[0009] The distance between the center lines of two adjacent protrusions on the same long side is equal to the width of the two sewage channels.

[0010] Optionally, the protrusion is square, the height of the protrusion is equal to the height of the sewage chamber, and the internal space of the protrusion is connected to the sewage chamber, so that the sewage can flow into the protrusion when passing through the gap between the baffle and the long side, so that the plasma generated by the discharge electrode can enter the sewage.

[0011] Further optionally, two upper and lower ground electrodes are arranged on the side of the wide side of the baffle facing the sewage chamber, and the two ground electrodes of the same baffle are arranged on the same side, and the two ground electrodes are arranged horizontally and respectively correspond to the two discharge electrodes in the protrusion pointed to by the free end of the baffle, that is, the ground electrode and the corresponding discharge electrode are at the same height;

[0012] One end of the ground electrode points to the corresponding discharge electrode but does not contact the discharge electrode, and the other end is connected to the grounding wire, which passes through the long side of the sewage cavity connected to the fixed end of the baffle, extends out of the sewage cavity and is grounded.

[0013] Further optionally, the two opposite wide sides of the sewage chamber are a first wide side and a second wide side, and in the upper part of the sewage chamber, a first water opening is provided at one end of the downstream side of the sewage channel closest to the first wide side, and the first water opening is provided on the partition plate, so that the sewage diverted from the second wide side to the first wide side flows from the first water opening of the partition plate to the lower part of the sewage chamber after flowing through the last sewage channel;

[0014] In the lower part of the sewage chamber, a water pump and a second water outlet are provided at one end of the downstream side of the sewage channel closest to the second wide side. The second water outlet is provided on the partition plate. The water inlet of the water pump is located in the corresponding sewage channel, and the water outlet is connected to the second water outlet, so that the sewage that flows from the first wide side to the second wide side is backflowed from the second water outlet to the upper part of the sewage chamber through the action of the water pump after flowing through the last sewage channel, so that the water in the sewage chamber forms a circulating flow in the upper and lower parts, thereby improving the sewage treatment effect.

[0015] Optionally, a compressed microwave channel is provided on each side of the protrusion, and the longitudinal sections of the two compressed microwave channels are both square; the inner diameters of the two compressed microwave channels gradually decrease toward the protrusion, so that convergent compressed microwave channels are formed on both sides of the protrusion, which can better converge microwave energy;

[0016] The two discharge electrodes in the protrusion correspond to the positions of the two compressed microwave channels and the interfaces of the side surfaces of the protrusion in the horizontal direction, so that the two discharge electrodes can receive the microwave energy transmitted by the compressed microwave channels;

[0017] One end of the two compressed microwave channels away from the protruding part is connected to the microwave guide tube, and the longitudinal section of the microwave guide tube is also square.

[0018] Optionally, a plurality of auxiliary protrusions are evenly arranged on the first wide side of the sewage chamber, two upper and lower auxiliary discharge electrodes are arranged in the auxiliary protrusions, and the partition plate extends into the auxiliary protrusions to separate the two auxiliary discharge electrodes; the auxiliary protrusions are square, the height of the auxiliary protrusions is equal to the height of the sewage chamber, and the internal space of the auxiliary protrusions is connected to the sewage chamber.

[0019] Further optionally, a horizontally arranged auxiliary ground electrode is respectively provided above and below the partition plate, the auxiliary ground electrode corresponds to the auxiliary discharge electrode in the auxiliary protrusion, and is at the same height as the corresponding auxiliary discharge electrode, and the auxiliary ground electrode and the auxiliary discharge electrode are in a one-to-one correspondence relationship;

[0020] One end of the auxiliary ground electrode points to the corresponding auxiliary discharge electrode but the two do not touch each other, and the other end passes through the first wide side surface, extends out of the sewage cavity, and is then connected to an external drive motor through an insulating sleeve;

[0021] A plurality of stirring parts are arranged on the auxiliary ground electrode. The auxiliary ground electrode passes through the center of the stirring part and serves as the rotating shaft of the stirring part. The driving motor drives the auxiliary ground electrode and the stirring part to rotate.

[0022] Further optionally, the stirring portion includes a plurality of stirring blades, which are evenly distributed around the circumference of the auxiliary ground electrode, and the stirring blades are perpendicular to the wide side of the sewage chamber;

[0023] One end of the auxiliary ground electrode connected to the drive motor is wrapped with an insulating sleeve, and then directly connected to the drive motor through the insulating sleeve to prevent the auxiliary ground electrode from directly contacting the drive motor. The part of the auxiliary ground electrode outside the sewage container is connected to a brush, and the brush is connected to the grounding wire for grounding, thereby indirectly realizing the grounding of the auxiliary ground electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram (side view) of the multi-electrode side-by-side liquid plasma wastewater treatment device;

[0025] Figure 2 is a top view schematic diagram of the sewage chamber;

[0026] Figure 3 is a schematic diagram of the cooperation between the protrusion and the microwave conduit;

[0027] Figure 4 Schematic diagram of the stirring unit.

[0028] In the accompanying drawings, 1-microwave source, 2-microwave guide tube, 3-gas collecting cavity, 4-sewage cavity, 5-exhaust pipe, 6-partition plate, 7-baffle, 8-protrusion, 9-sub-protrusion, 10-discharge electrode, 11-sub-discharge electrode, 12-first long side, 13-second long side, 14-first wide side, 15-second wide side, 16-sewage channel, 17-ground electrode, 18-sub-ground electrode, 19-first water outlet, 20-second water outlet, 21-water pump, 22-stirring part, 23-compression microwave channel, 24-first sealing part, 25-opening one, 26-opening two, 27-insulating sleeve, 28-brush. DETAILED DESCRIPTION

[0029] This embodiment provides a multi-electrode parallel liquid plasma wastewater treatment device, such as Figure 1-Figure 4 As shown, it includes a horizontal sewage container, at least one microwave source 1 and a microwave guide tube 2. The sewage container includes an air collecting chamber 3 and a sewage chamber 4. The air collecting chamber 3 is located above the sewage chamber 4. The top of the air collecting chamber 3 is connected to an exhaust pipe 5 for maintaining the vacuum degree in the sewage container. A partition plate 6 is provided in the middle of the sewage chamber 4 to divide the sewage chamber 4 into an upper and a lower part.

[0030] A plurality of protrusions 8 are provided on at least two opposite sides of the sewage chamber 4, and two upper and lower discharge electrodes 10 are provided in the protrusions 8. The partition plate 6 extends into the protrusions 8 to separate the two discharge electrodes 10 therein; one end of the microwave guide tube 2 is connected to the microwave source 1, and the other end is connected in parallel to the plurality of protrusions 8, so as to excite the discharge electrode 10 to discharge and generate plasma;

[0031] A plurality of baffles 7 are provided in the sewage chamber 4, the bottom of the baffle 7 is fixed on the bottom surface of the sewage chamber 4, the top of the baffle 7 is higher than the liquid level of the sewage chamber 4, one end of the baffle 7 is fixedly connected to the side of the sewage chamber 4, and the other end points to the protrusion 8 on the opposite side. Two adjacent baffles 7 are respectively fixed on the opposite sides, so that the sewage in the upper and lower parts of the sewage chamber 4 flow along the baffles 7 respectively.

[0032] Optionally, the sewage chamber 4 is square, the bottom surface of the gas collecting chamber 3 coincides with the top surface of the sewage chamber 4, the gas collecting chamber 3 is connected to the internal space of the sewage chamber 4, and the gas collecting chamber 3 is a cone with a larger bottom and a smaller top, which is convenient for gathering the original gas in the sewage chamber 4 and the waste gas generated after the degradation of organic matter to the top of the gas collecting chamber 3. The exhaust pipe 5 is connected to an external vacuum pump to provide sufficient vacuum for the sewage chamber 4 during the sewage treatment process, creating an environment conducive to the generation of liquid plasma.

[0033] Further optionally, the inner wall surface of the gas collecting cavity 3 has a curvature that adapts to the overall conical shape, so that the inner wall of the gas collecting cavity 3 is smooth at all places, avoiding the edges and corners of the standard cone from hindering the gas flow, and minimizing the gas flow resistance.

[0034] Optionally, the two opposite long sides of the sewage chamber 4 are a first long side 12 and a second long side 13, and a plurality of protrusions 8 are evenly arranged on the first long side 12 and the second long side 13; the protrusions 8 on the first long side 12 and the second long side 13 do not correspond to each other in the width direction of the sewage chamber 4 and are staggered with each other;

[0035] A plurality of baffles 7 are evenly arranged in the sewage chamber 4 along the length direction. The baffles 7 are parallel to the wide side of the sewage chamber 4. The fixed end of the baffle 7 is fixedly connected to one long side of the sewage chamber 4, and the other end is a free end pointing to the discharge electrode 10 in the protrusion 8 of the opposite long side. A gap is left between the free end and the corresponding long side, allowing the sewage in the sewage chamber 4 to flow to the next baffle 7 through the gap; the fixed ends of two adjacent baffles are fixed on two opposite long sides, and a sewage channel 16 is formed between the two adjacent baffles;

[0036] The distance between the center lines of two adjacent protrusions on the same long side is equal to the width of the two sewage channels.

[0037] Optionally, the protrusion 8 is square, the height of the protrusion 8 is equal to the height of the sewage chamber 4, and the internal space of the protrusion 8 is connected to the sewage chamber 4, so that the sewage can flow into the protrusion 8 when passing through the gap between the baffle 7 and the long side surface, so that the plasma generated by the discharge electrode 10 can enter the sewage;

[0038] The two discharge electrodes 10 are arranged along the vertical center line of the protrusion 8, with a gap between the two discharge electrodes 10 and no contact with each other. The part where the partition plate 6 extends into the protrusion 8 divides the protrusion 8 into two parts which are completely isolated and unconnected with each other. The upper and lower discharge electrodes 10 are bombarded by microwaves at the same time to generate plasma, and the plasma then enters the upper part and the lower part of the sewage chamber 4 respectively.

[0039] Further optionally, two upper and lower ground electrodes 17 are arranged on the side of the baffle 7 facing the wide side of the sewage chamber 4, and the two ground electrodes 17 of the same baffle 7 are arranged on the same side. The two ground electrodes 17 are arranged horizontally and respectively correspond to the two discharge electrodes 10 in the protrusion 8 to which the free end of the baffle 7 points, that is, the ground electrode 17 and the corresponding discharge electrode 10 are at the same height;

[0040] The ground electrode 17 is arranged along the side of the baffle plate 7, one end of the ground electrode 17 points to the corresponding discharge electrode 10 but does not touch the discharge electrode 10, and the other end is connected to the grounding wire. The grounding wire passes through the long side of the sewage chamber 4 connected to the fixed end of the baffle plate 7, extends out of the sewage chamber 4 and is grounded, completing the electrical connection between a pair of discharge electrodes 10 and the ground electrode 17.

[0041] Preferably, the sides of all baffles 7 where the ground electrodes 17 are arranged face the same wide side of the sewage chamber 4 .

[0042] Further optionally, the two opposite wide sides of the sewage chamber 4 are a first wide side 14 and a second wide side 15, and in the upper part of the sewage chamber 4, a first water opening 19 is provided at one end of the downstream side of the sewage channel closest to the first wide side 14, and the first water opening 19 is provided on the partition plate 6, so that the sewage diverted from the second wide side 15 to the first wide side 14 flows from the first water opening 19 of the partition plate 6 to the lower part of the sewage chamber 4 after flowing through the last sewage channel;

[0043] In the lower part of the sewage chamber 4, a water pump 21 and a second water port 20 are provided at one end of the downstream side of the sewage channel closest to the second wide side 15. The second water port 20 is provided on the partition plate 6. The water inlet of the water pump 21 is located in the corresponding sewage channel, and the water outlet is connected to the second water port 20, so that the sewage that is diverted from the first wide side 14 to the second wide side 15 flows through the last sewage channel and is acted upon by the water pump 21, and flows back to the upper part of the sewage chamber 4 from the second water port 20, so that the water in the sewage chamber 4 forms a circulation flow in the upper and lower parts, thereby improving the sewage treatment effect.

[0044] Further optionally, in the lower part of the sewage chamber 4, a spiral conveying pipe is provided in the sewage channel closest to the first wide side 14, and the surface of the spiral conveying pipe is provided with continuous spiral disks evenly arranged along its own length direction. The end of the spiral conveying pipe away from the first water outlet 19 passes through the long side of the sewage chamber 4 and is connected to an external motor to drive the spiral conveying pipe to rotate, so that the spiral disk promotes the sewage in the sewage channel to continuously flow to the downstream side.

[0045] When in use, the sewage to be treated is poured into the sewage chamber 4 from the top opening of the gas collecting chamber 3. After pouring in an appropriate amount of water, the liquid level does not exceed the top of the baffle 7. The top opening of the gas collecting chamber 3 and the vacuum pump are connected by the suction pipe 5. The vacuum pump evacuates the sewage container to obtain a vacuum degree of about 0.08 MPa. The water pump 21 and the spiral conveying pipe are started to drive the water in the upper and lower parts of the sewage chamber 4 to circulate. The partition plate 6 completely separates the sewage chamber 4 into the upper and lower parts. In the upper part of the sewage chamber 4, the sewage starts from the sewage channel closest to the second wide side 15, flows along each baffle, passes through the upper part of the protrusion 8 of the two long sides, and takes away the plasma generated by the discharge electrode 10 in this part. The baffled flow of the sewage enables the plasma to be fully mixed with the sewage, thereby improving the treatment effect of pollutants. Then the sewage flows to the sewage channel corresponding to the lower part of the sewage chamber 4 through the first water opening 19, and with the first water opening 19 as the starting point, it flows along the part of each baffle in the lower part of the sewage chamber 4 in cooperation with the water conveying function of the spiral conveying pipe, flows to the second wide side 15, passes through the lower part of the protrusions 8 of the two long sides along the way, and takes away the plasma generated by the discharge electrode 10 in this part. Then the sewage is pumped out by the water pump 21, sent to the upper part of the sewage chamber 4 through the second water opening 20, and continues to circulate along the above route until the sewage treatment is completed.

[0046] Optionally, a compressed microwave channel 23 is provided on both sides of the protrusion 8, and the longitudinal sections of the two compressed microwave channels are both square; the inner diameters of the two compressed microwave channels gradually decrease towards the protrusion 8, so that convergent compressed microwave channels are formed on both sides of the protrusion 8, which can better converge microwave energy;

[0047] The two discharge electrodes 10 in the protrusion 8 correspond to the positions of the two compressed microwave channels and the side interfaces of the protrusion 8 in the horizontal direction, so that the two discharge electrodes 10 can receive the microwave energy transmitted by the compressed microwave channels;

[0048] One end of the two compressed microwave channels away from the protruding portion 8 is connected to the microwave conduit 2. The longitudinal section of the microwave conduit 2 is also square, which is beneficial to reducing the reflection loss of the microwave.

[0049] Further optionally, the side of the protrusion 8 is provided with an interface 1 that is recessed into the interior of the protrusion 8, and the shape and size of interface 1 correspond to the shape and size of interface 2 of the compressed microwave channel facing the protrusion 8, so that interface 1 and interface 2 are adapted to each other, and sealing rings are provided at interface 1 and interface 2.

[0050] Further optionally, a first sealing portion 24 is provided at the docking position of the protrusion 8 and the compressed microwave channels on both sides thereof, the inner wall shape of the first sealing portion 24 is adapted to the shape of the protrusion 8 and the compressed microwave channels on both sides thereof, and an opening 25 is provided at the top and bottom of the first sealing portion 24 respectively, allowing the upper and lower parts of the protrusion 8 to extend out of the first sealing portion 24; openings 26 are provided at both sides of the first sealing portion 24 respectively, allowing the compressed microwave channels on both sides to extend out of the first sealing portion 24;

[0051] The first sealing portion 24 includes two sealing plates with the same structure. After the protrusion 8 is connected to the compressed microwave channels on the left and right sides, the two sealing plates are fastened and connected from the front and back sides to cover the part where the protrusion 8 is connected to the compressed microwave channels. The edge parts of the two sealing plates are sealed and fixed by a number of bolts.

[0052] The microwave source 1 is turned on, and the microwave is transmitted to the compressed microwave channel of each protrusion 8 through the microwave conduit 2, and the microwave energy is directly coupled to the sewage of the protrusion 8. Microbubbles are formed at the tip of the discharge electrode 10. The electrons in the microbubbles are accelerated under the action of the strong electric field to obtain higher energy. The accelerated electrons collide with water molecules and ionize, causing the bubble to break down, and then form an electron avalanche to develop into liquid plasma. The liquid plasma oxidizes and treats the sewage and degrades the organic matter in the sewage. The square microwave conduit 2 and the compressed microwave channel reduce the microwave reflection loss and transmission conversion loss, improve the energy utilization efficiency, and thus allow the microwave source 1 to work at a higher power, which is conducive to improving the energy of the liquid plasma.

[0053] The present invention creatively sets a plurality of protrusions 8 on the two long sides of the sewage chamber 4, and sets two upper and lower discharge electrodes 10 in the protrusions 8 for the upper and lower parts of the sewage chamber 4, so that the sewage can continuously replenish the plasma when circulating in the sewage chamber 4, and the baffled flow of the sewage also has a mixing effect, promoting the uniform mixing of the sewage and the plasma, and improving the sewage treatment effect. The present invention cleverly uses the baffle plate 7 as a support body for the ground electrode 17, and fully utilizes the structural characteristics of the baffle body (one end is fixedly connected to the inner wall of the sewage chamber 4, and the other end points to the protrusion 8).

[0054] Optionally, a plurality of auxiliary protrusions 9 are evenly arranged on the first wide side surface 14 of the sewage chamber 4, and the structure of the auxiliary protrusions 9 is the same as that of the protrusions 8, that is, two upper and lower auxiliary discharge electrodes 11 are arranged in the auxiliary protrusions 9, and the partition plate 6 extends into the auxiliary protrusions 9 to separate the two auxiliary discharge electrodes 11; the auxiliary protrusions 9 are square, and the height of the auxiliary protrusions 9 is equal to the height of the sewage chamber 4. The internal space of the auxiliary protrusions 9 is connected with the sewage chamber 4, so that the sewage can flow into the auxiliary protrusions 9, so that the plasma generated by the auxiliary discharge electrodes 11 can enter the sewage;

[0055] The two auxiliary discharge electrodes 11 are arranged along the vertical center line of the auxiliary protrusion 9. There is a gap between the two auxiliary discharge electrodes 11 and they do not contact each other. The part of the partition plate 6 extending into the auxiliary protrusion 9 divides the auxiliary protrusion 9 into two parts, which are completely isolated and unconnected from each other. The upper and lower auxiliary discharge electrodes are bombarded by microwaves at the same time to generate plasma, and the plasma then enters the upper part and the lower part of the sewage chamber 4 respectively.

[0056] Further optionally, a secondary compression microwave channel is respectively provided on both sides of the secondary protrusion 9, and the longitudinal sections of the two secondary compression microwave channels are both square; the inner diameters of the two secondary compression microwave channels are gradually reduced toward the direction close to the secondary protrusion 9, so that convergent compression microwave channels are formed on both sides of the secondary protrusion 9, which can better converge microwave energy;

[0057] The two auxiliary discharge electrodes in the auxiliary protrusion 9 correspond to the positions of the two auxiliary compression microwave channels and the side interfaces of the auxiliary protrusion 9 in the horizontal direction, so that the two auxiliary discharge electrodes 11 can receive the microwave energy transmitted by the compression microwave channels; the ends of the two auxiliary compression microwave channels away from the protrusion 8 are connected to the microwave conduit 2.

[0058] Further optionally, the side of the secondary protrusion 9 is provided with an interface three recessed toward the inside of the secondary protrusion 9, and the shape and size of interface three correspond to the shape and size of interface four of the secondary compression microwave channel facing the secondary protrusion 9, so that interface three and interface four are adapted to each other, and sealing rings are provided on interface three and interface four.

[0059] Further optionally, a second sealing portion is provided at the docking position of the secondary protrusion 9 and the secondary compression microwave channels on both sides thereof, the inner wall shape of the second sealing portion is adapted to the shape of the secondary protrusion 9 and the secondary compression microwave channels on both sides thereof, and openings three are provided at the top and bottom of the second sealing portion, respectively, allowing the upper and lower parts of the secondary protrusion 9 to extend out of the second sealing portion; openings four are provided at both sides of the second sealing portion, respectively, allowing the secondary compression microwave channels on both sides to extend out of the second sealing portion;

[0060] The second sealing part includes two auxiliary sealing plates with the same structure. After the auxiliary protrusion 9 is connected with the auxiliary compression microwave channels on the left and right sides, the two auxiliary sealing plates are fastened and connected from the front and back sides to cover the part where the auxiliary protrusion 9 is connected with the auxiliary compression microwave channels. The edge parts of the two auxiliary sealing plates are sealed and fixed by a number of bolts.

[0061] Further optionally, a horizontally arranged auxiliary ground electrode 18 is respectively provided above and below the partition plate 6, the auxiliary ground electrode 18 corresponds to the auxiliary discharge electrode 11 in the auxiliary protrusion 9, and is at the same height as the corresponding auxiliary discharge electrode 11, and the auxiliary ground electrode 18 and the auxiliary discharge electrode 11 are in a one-to-one correspondence relationship;

[0062] One end of the auxiliary ground electrode 18 points to the corresponding auxiliary discharge electrode 11 but the two do not touch each other, and the other end passes through the first wide side surface 14, extends out of the sewage cavity 4, and is then connected to an external drive motor through an insulating sleeve 27;

[0063] A plurality of stirring parts 22 are provided on the auxiliary ground electrode 18 . The auxiliary ground electrode 18 passes through the center of the stirring part 22 and serves as the rotation axis of the stirring part 22 . The driving motor drives the auxiliary ground electrode 18 and the stirring part 22 to rotate.

[0064] Further optionally, the auxiliary ground electrode 18 passes through each baffle along the length direction of the sewage chamber 4, and the baffle 7 provides support for the auxiliary ground electrode 18; the stirring part 22 includes a plurality of stirring blades, which are evenly distributed around the circumference of the auxiliary ground electrode 18, and the stirring blades are perpendicular to the wide side of the sewage chamber 4;

[0065] One end of the auxiliary ground electrode 18 connected to the drive motor is wrapped with an insulating sleeve 27, and then directly connected to the drive motor through the insulating sleeve 27 to prevent the auxiliary ground electrode 18 from directly contacting the drive motor. The part of the auxiliary ground electrode 18 outside the sewage container is connected to a brush 28, and the brush 28 is connected to the grounding wire for grounding, thereby indirectly achieving the grounding of the auxiliary ground electrode 18.

[0066] Since one auxiliary ground electrode 18 can only be connected to one driving motor and can only have one rotation direction at the same time, and the sewage flow directions in each sewage channel through which the ground electrode 17 passes are different, therefore, one auxiliary ground electrode 18 is only provided with a stirring part in the sewage channel with the same sewage flow direction, and the rotation direction of the stirring part is the same as the sewage flow direction, so as to promote the flow of sewage and the mixing of sewage and plasma. Since a plurality of auxiliary protrusions 9 are evenly provided on the first wide side surface 14, the upper part or the lower part of the sewage chamber 4 is correspondingly provided with the same number of auxiliary ground electrodes 18, and the rotation direction of another auxiliary ground electrode 18 is opposite to that of the previous auxiliary ground electrode 18. By providing a stirring part in the sewage channel with the opposite flow direction, the stirring part can be provided in all sewage channels, and the rotation direction of the stirring part is always the same as the sewage flow direction in the sewage channel in which it is located.

[0067] The present invention unexpectedly discovered that when the auxiliary ground electrode 18 is in a rotating state, the sewage treatment effect is better. Although it cannot be accurately explained now, it is possible that the auxiliary discharge electrode 11 and the rotating auxiliary ground electrode 18 produce some kind of electromagnetic effect, which, when combined with plasma, has an excellent effect of degrading organic matter.

[0068] Further optionally, the material of the ground electrode 17 and the auxiliary ground electrode 18 is stainless steel, and the material of the discharge electrode 10 and the auxiliary discharge electrode 11 is selected from one or an alloy formed by two or more of platinum, tungsten, iron, nickel, and copper;

[0069] The sewage container and the protrusion 8 are made of transparent quartz and are integrally formed;

[0070] The baffle plate 7 and the partition plate 6 are made of transparent quartz and are integrally formed with the sewage container and the protrusion 8. Alternatively, the baffle plate 7 and the partition plate 6 are made of transparent plastic and are inserted into grooves at corresponding positions of the sewage container.

[0071] Further optionally, the baffle plates 7 are provided with corresponding through holes at positions corresponding to the partition plates 6 and the auxiliary ground electrodes 18, so that the partition plates 6 and the auxiliary ground electrodes 18 pass through the respective baffle plates 7, and sealing rings / gaskets are provided at the through holes;

[0072] The position where the grounding wire of the ground electrode 17 passes through the long side of the sewage chamber 4 and the position where the auxiliary ground electrode 18 passes through the wide side of the sewage chamber 4 are also sealed.

[0073] Regarding the placement of the discharge electrode 10 in the protruding portion 8 and the auxiliary discharge electrode 11 in the auxiliary protruding portion 9, a groove-type jack can be provided in the protruding portion 8 and the auxiliary protruding portion 9, and the discharge electrode 10 and the auxiliary discharge electrode 11 can be sent into the sewage chamber 4 from the top opening of the gas collecting chamber 3 by using a tool, and then installed in the protruding portion 8 and the auxiliary protruding portion 9. Alternatively, the sides of the protruding portion 8 and the auxiliary protruding portion 9 away from the sewage chamber 4 can be opened for installing the discharge electrode 10 and the auxiliary discharge electrode 11, and then the sides can be closed with flanges.

Claims

1. A multi-electrode parallel liquid plasma wastewater treatment device, characterized in that: The invention comprises a horizontal sewage container, at least one microwave source and a microwave guide tube. The sewage container comprises an air collecting chamber and a sewage chamber. The air collecting chamber is located above the sewage chamber. The top of the air collecting chamber is connected to an exhaust pipe for maintaining the vacuum degree in the sewage container. A partition plate is provided in the middle of the sewage chamber to divide the sewage chamber into an upper and a lower part. A plurality of protrusions are provided on at least two opposite sides of the sewage chamber, and two upper and lower discharge electrodes are provided in the protrusions. A partition plate extends into the protrusions to separate the two discharge electrodes. One end of the microwave guide tube is connected to a microwave source, and the other end is connected in parallel to the plurality of protrusions to excite the discharge electrode to discharge and generate plasma. A plurality of baffles are arranged in the sewage chamber, the bottom of the baffle is fixed on the bottom surface of the sewage chamber, the top of the baffle is higher than the liquid level of the sewage chamber, one end of the baffle is fixedly connected to the side of the sewage chamber, and the other end points to the protrusion of the opposite side, and two adjacent baffles are respectively fixed on the opposite side, so that the sewage in the upper part and the lower part of the sewage chamber flows along the baffles respectively; The two opposite long sides of the sewage chamber are a first long side and a second long side, and a plurality of protrusions are evenly arranged on the first long side and the second long side; the protrusions on the first long side and the second long side do not correspond to each other in the width direction of the sewage chamber and are staggered with each other; A plurality of baffles are evenly arranged in the sewage chamber along the length direction, the baffles are parallel to the wide side of the sewage chamber, the fixed end of the baffle is fixedly connected to a long side of the sewage chamber, the other end is a free end and points to the discharge electrode in the protrusion of the opposite long side, and a gap is left between the free end and the corresponding long side, allowing the sewage in the sewage chamber to flow to the next baffle through the gap; the fixed ends of two adjacent baffles are fixed on two opposite long sides, and a sewage channel is formed between the two adjacent baffles; The distance between the center lines of two adjacent protrusions on the same long side is equal to the width of the two sewage channels; The protrusion is square, the height of the protrusion is equal to the height of the sewage chamber, and the internal space of the protrusion is connected with the sewage chamber, so that the sewage can flow into the protrusion when passing through the gap between the baffle and the long side surface, so that the plasma generated by the discharge electrode can enter the sewage; Two upper and lower ground electrodes are arranged on the side of the wide side of the baffle facing the sewage chamber, and the two ground electrodes of the same baffle are arranged on the same side. The two ground electrodes are arranged horizontally and respectively correspond to the two discharge electrodes in the protrusion pointed to by the free end of the baffle, and the ground electrode and the corresponding discharge electrode are at the same height; One end of the ground electrode points to the corresponding discharge electrode but does not contact the discharge electrode, and the other end is connected to a ground wire, which passes through the long side of the sewage chamber connected to the fixed end of the baffle, extends out of the sewage chamber and is grounded; The two opposite wide sides of the sewage chamber are a first wide side and a second wide side. In the upper part of the sewage chamber, a first water opening is provided at one end of the downstream side of the sewage channel closest to the first wide side. The first water opening is provided on the partition plate, so that the sewage diverted from the second wide side to the first wide side flows from the first water opening of the partition plate to the lower part of the sewage chamber after flowing through the last sewage channel. In the lower part of the sewage chamber, a water pump and a second water outlet are provided at one end of the downstream side of the sewage channel closest to the second wide side. The second water outlet is provided on the partition plate. The water inlet of the water pump is located in the corresponding sewage channel, and the water outlet is connected to the second water outlet, so that the sewage diverted from the first wide side to the second wide side flows through the last sewage channel and is backflowed from the second water outlet to the upper part of the sewage chamber through the action of the water pump, so that the water in the sewage chamber forms a circulation flow in the upper and lower parts, thereby improving the sewage treatment effect; A compressed microwave channel is provided on both sides of the protrusion, and the longitudinal sections of the two compressed microwave channels are both square; the inner diameters of the two compressed microwave channels gradually decrease towards the protrusion, so that convergent compressed microwave channels are formed on both sides of the protrusion, which can better converge microwave energy; The two discharge electrodes in the protrusion correspond to the positions of the two compressed microwave channels and the interfaces of the side surfaces of the protrusion in the horizontal direction, so that the two discharge electrodes can receive the microwave energy transmitted by the compressed microwave channels; The ends of the two compressed microwave channels away from the protruding parts are connected to the microwave conduit, and the longitudinal section of the microwave conduit is also square, which is conducive to reducing the reflection loss of microwaves; A plurality of auxiliary protrusions are evenly arranged on the first wide side of the sewage chamber, and two upper and lower auxiliary discharge electrodes are arranged in the auxiliary protrusions. The partition plate extends into the auxiliary protrusions to separate the two auxiliary discharge electrodes. The auxiliary protrusions are square, and the height of the auxiliary protrusions is equal to the height of the sewage chamber. The internal space of the auxiliary protrusions is connected to the sewage chamber. A sub-ground electrode is horizontally arranged above and below the partition plate, the sub-ground electrode corresponds to the sub-discharge electrode in the sub-protrusion, and is at the same height as the corresponding sub-discharge electrode, and the sub-ground electrode and the sub-discharge electrode are in a one-to-one correspondence relationship; One end of the auxiliary ground electrode points to the corresponding auxiliary discharge electrode but the two do not touch each other, and the other end passes through the first wide side surface, extends out of the sewage cavity, and is then connected to an external drive motor through an insulating sleeve; The auxiliary ground electrode is provided with a plurality of stirring parts, and the auxiliary ground electrode passes through the center of the stirring part and serves as the rotating shaft of the stirring part. The driving motor drives the auxiliary ground electrode and the stirring part to rotate; The stirring part comprises a plurality of stirring blades which are evenly distributed around the circumference of the auxiliary ground electrode, and the stirring blades are perpendicular to the wide side of the sewage chamber; One end of the auxiliary ground electrode connected to the drive motor is wrapped with an insulating sleeve, and then directly connected to the drive motor through the insulating sleeve to prevent the auxiliary ground electrode from directly contacting the drive motor. The part of the auxiliary ground electrode outside the sewage container is connected to a brush, and the brush is connected to the ground wire for grounding; The microwave source is turned on, and the microwaves are transmitted to the compressed microwave channels of each protrusion through the microwave duct, directly coupling the microwave energy into the sewage of the protrusion. Microbubbles are formed at the tip of the discharge electrode. The electrons in the microbubbles are accelerated under the action of the strong electric field to obtain higher energy. The accelerated electrons collide with water molecules and ionize, causing the bubble to break through, thereby forming an electron avalanche and developing into liquid plasma. The liquid plasma oxidizes the sewage and degrades the organic matter in the sewage.

2. The multi-electrode parallel liquid plasma wastewater treatment device according to claim 1, characterized in that: The sewage chamber is square, the bottom surface of the gas collecting chamber coincides with the top surface of the sewage chamber, the gas collecting chamber is connected to the internal space of the sewage chamber, the gas collecting chamber is a cone with a larger bottom and a smaller top, and the exhaust pipe is connected to an external vacuum pump.

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