A multi-stage treatment device and method for industrial oxidation wastewater

Abstract

This invention relates to the field of wastewater treatment technology, and in particular to a multi-stage treatment device and method for industrial oxidation wastewater. The device includes an electrocatalytic tank, a treatment frame fixedly connected to the inner side of the electrocatalytic tank, and several anode and cathode plates arranged alternately within the treatment frame. A central block is fixedly connected to the middle of the inner side of the treatment frame. A pair of upper plates are positioned on both the front and rear sides of the central block relative to the positions between the anode and cathode plates, and a central plate is positioned between the upper plates. A through groove is formed in the side wall of the central block. Through the arrangement of the upper plates, central plates, and a flipping mechanism, the residence time during the wastewater electrocatalysis process can be adjusted. By flipping the surfaces of the upper and central plates by 90 degrees, the device can switch between a straight-through channel and an S-channel. Under low load, it flips to a straight-through channel, allowing water to follow the shortest path and avoiding over-oxidation and wasted power. Under high load, it flips back to an S-channel, instantly increasing the path length to ensure sufficient contact time and stable COD removal rate, eliminating the need for additional parallel tanks.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a multi-stage treatment device and method for industrial oxidation wastewater. Background Technology

[0002] Existing industrial wastewater treatment devices typically employ a three-stage process: pretreatment, electrocatalytic oxidation, and post-treatment. Wastewater is first homogenized, pH adjusted, and impurities filtered out before being pumped into an electrocatalytic tank. Multiple sets of anode-cathode plates are arranged alternately in the tank. When direct current is applied, strong oxidants such as hydroxyl radicals are generated on the surface of the plates, causing organic matter to open rings and break chains, resulting in a simultaneous decrease in COD and color. The effluent from the electrocatalytic oxidation process enters a coagulation sedimentation tank, where a small amount of flocculant is added. Flocs and heavy metals that detached during the oxidation process settle and separate here. The supernatant is then filtered by a security filter to remove residual turbidity. Qualified water is discharged or reused, and sludge is periodically discharged and transported off-site.

[0003] Electrocatalytic oxidation, as one of the advanced oxidation technologies, has been widely used in recent years for the pretreatment and advanced treatment of high COD and recalcitrant industrial wastewater. Its principle is that under the action of an external electric field, active species such as hydroxyl radicals (OH), ozone, and hydrogen peroxide are generated in situ on the anode surface. The oxidation potential is as high as 2.8V, which can non-selectively attack organic pollutants at room temperature and pressure to achieve ring opening, decolorization and mineralization. At the same time, the cathode provides an electron channel and has the functions of heavy metal reduction and H2O2 production. It has the advantages of low reagent dosage, low sludge production and strong operational controllability.

[0004] However, existing electrocatalytic cells generally use fixed electrode arrays. Once the spacing, number of groups, and water flow path of the anode and cathode are welded or cast, they cannot be adjusted online. After the wastewater enters uniformly from the bottom, it only relies on the gap between the electrodes to make a one-time upward flow. The hydraulic retention time is constant and cannot be flexibly matched with fluctuations in influent concentration, flow rate, or discharge standards. When the treatment load suddenly decreases, the excessive retention time leads to waste of electricity and an increase in anode side reactions. When the load increases, insufficient retention time reduces the COD removal rate, requiring additional parallel structures, resulting in a double waste of investment and land area.

[0005] Therefore, a multi-stage treatment device and method for industrial oxidation wastewater is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by proposing a multi-stage treatment device and method for industrial oxidation wastewater.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a multi-stage treatment device for industrial oxidation wastewater, comprising an electrocatalytic tank, a treatment frame fixedly connected to the inner side of the electrocatalytic tank, a plurality of anode plates and cathode plates staggered within the treatment frame, a central block fixedly connected to the middle of the inner side of the treatment frame, a pair of upper plates provided on the front and rear sides of the central block relative to the positions between the anode plates and cathode plates, a central plate provided between the upper plates, a through groove penetrating through the side wall of the central block, a lower groove provided at the bottom of the through groove relative to the positions between the anode plates and cathode plates, and a through groove on one side of the treatment frame. The upper and lower water inlet pipes are fixedly connected. The inner side of the lower tank is rotatably connected to the upper and middle plates, and the front and rear sides of the rotating shaft pass through the outer wall of the middle block and are fixedly connected to the side walls of the upper and middle plates. A flipping mechanism is also provided for quickly driving the rotating shaft to flip. A pair of front grooves are opened through the front side of the middle block, and L-shaped blocks are provided in each of the front grooves. A baffle is slidably connected through the top of the middle block. The upper and lower water outlet pipes are fixedly connected through the other side of the treatment frame. The middle block is also provided with an adjustment mechanism for adjusting the wastewater electrocatalytic process.

[0008] In the above technical solution, the middle block further divides the processing frame into two parts. The upper water inlet pipe and the lower water inlet pipe are respectively arranged on one side of the two chambers of the processing frame separated by the middle block. The upper water inlet pipe is fixedly connected to the bottom end of the side wall of the processing frame, and the lower water inlet pipe is fixedly connected to the top end of the side wall of the processing frame. The upper plate is arranged on the side close to the upper water inlet pipe, and the middle plate is arranged on the side away from the upper water inlet pipe.

[0009] In the above technical solution, the upper water outlet pipe is located opposite the upper water inlet pipe, and the lower water outlet pipe is located opposite the lower water inlet pipe. The upper water outlet pipe is fixedly connected to the top of the side wall of the processing frame, and the lower water outlet pipe is fixedly connected to the bottom of the side wall of the processing frame. Both the lower water inlet pipe and the upper water outlet pipe are equipped with solenoid valves, and the solenoid valves are electrically connected to the controller through wires.

[0010] In the above technical solution, the flipping mechanism further includes an electric telescopic cylinder. A front frame is fixedly connected to the inner side of the front groove. A pair of electric telescopic cylinders are provided, and each electric telescopic cylinder is fixedly connected to the inner side of the front frame. A sliding plate is longitudinally slidably connected to the inner side of the through groove. An upper rod is fixedly connected to the side wall of the sliding plate relative to the inner side of the front groove. The output end of each electric telescopic cylinder is fixedly connected to the side wall of the L-shaped block. A vertical rod is fixedly connected to the bottom of the L-shaped block. An upper right-angle block with an inclined surface is fixedly connected to the side of the vertical rod near the upper rod. The inclined surface of the upper right-angle block fits against the outer wall of the upper rod. Pull ropes are wound around the outer wall of the rotating shaft. One end of each pull rope is fixedly connected to the outer wall of the rotating shaft. A main rope is fixedly connected to the bottom end of the sliding plate relative to the upper part of the lower groove. The other end of the main rope extends into the lower groove, and the other end of each pull rope is fixedly connected to the main rope.

[0011] In the above technical solution, further, an upper fixing plate is fixedly connected to the inner side of the through groove relative to the position above the sliding plate, and a number of upper springs are fixedly connected between the bottom of the upper fixing plate and the top of the sliding plate.

[0012] In the above technical solution, the outer wall of the rotating shaft is further provided with a spiral spring, one end of the spiral spring is fixedly connected to the outer wall of the rotating shaft, the other end of the spiral spring is fixedly connected to the inner side of the lower groove, the outer wall of the rotating shaft is fixedly connected with a side block, and the inner side of the lower groove is fixedly connected with a positioning block at a position relative to the top of the rotating shaft.

[0013] In the above technical solution, the adjusting mechanism further includes a central rod, and a pair of central rods are provided. The central rods are all fixedly connected to the side wall of the baffle facing the through groove. The rear side of the L-shaped block is fixedly connected to an extrusion plate, and the side wall of the extrusion plate is inclined. The inclined surface of the extrusion plate is in contact with the outer wall of the central rod. The inner side of the through groove is fixedly connected to a lower fixing plate relative to the position below the baffle. A plurality of lower springs are fixedly connected between the top end of the lower fixing plate and the bottom end of the baffle.

[0014] In the above technical solution, further, a lower rod is fixedly connected to the side wall of the sliding plate relative to the position inside the through groove, and the lower rod is located on the side away from the upper rod. A lower right-angle block with an inclined surface is fixedly connected to the side of the vertical rod near the lower rod, and the lower right-angle block and the upper right-angle block are symmetrically arranged.

[0015] In the above technical solution, further, a sealing plate is installed on the front side of the front frame by bolts, and a touch sensor is fixedly connected through the rear side of the sealing plate. The touch sensor is electrically connected to the controller through a guide.

[0016] A multi-stage treatment method for industrial oxidation wastewater includes the following steps;

[0017] Step 1: Low-grade wastewater is discharged from the upper and lower inlet pipes, enters the space between the anode and cathode plates for electrocatalytic treatment, and is then discharged after treatment;

[0018] Step 2: In the middle setting, control the flipping mechanism to start and drive the upper plate and the middle plate to flip 90 degrees, thereby making the upper plate and the middle plate separate between the anode plate and the cathode plate, so that the sewage flowing through it flows in an S-shape between the anode plate and the cathode plate;

[0019] Step 3: At high speed, control the operation of the adjustment mechanism to drive the baffle to move down into the channel and close the lower inlet pipe and the upper outlet pipe, so that the wastewater treated in the first chamber of the treatment frame flows into another chamber, undergoes electrocatalytic treatment again, and is discharged through the lower outlet pipe.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This invention achieves adjustment of the residence time during wastewater electrocatalysis through the design of an upper plate, a middle plate, and a flipping mechanism. By flipping the upper and middle plates 90 degrees, it can switch between a straight channel and an S-channel. Under low load, it flips to a straight channel, allowing water to follow the shortest path and avoiding excessive oxidation and wasted power. Under high load, it flips back to an S-channel, instantly increasing the path length and ensuring sufficient contact time. This results in a stable COD removal rate and eliminates the need for additional parallel tanks, greatly improving the flexibility of the device.

[0022] 2. This invention, through the setting of the adjustment mechanism, isolates a treatment frame into two parts. The two chambers can be connected in parallel (simultaneous operation when the water volume is large) or in series (secondary deep treatment when the water volume is small). There is no need to build a separate tank, saving half the space. At the same time, when connected in series, the flipping of the upper plate and the middle plate can be adjusted, the path increases instantly, ensuring sufficient contact time for sewage. The COD removal rate is matched with the load in real time, realizing multi-stage treatment of the device. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the electrocatalytic cell of the present invention.

[0024] Figure 2 This is a top-view three-dimensional structural diagram of the electrocatalytic cell of the present invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the processing frame of the present invention.

[0026] Figure 4 This is a schematic diagram of the partial frontal full-section three-dimensional structure of the middle block of the present invention;

[0027] Figure 5 Appendix of the present invention Figure 4 A magnified view of the structure at point A in the middle;

[0028] Figure 6 This is a partial three-dimensional structural diagram of the anode plate, upper plate, middle plate and cathode plate after adjustment according to the present invention;

[0029] Figure 7 This is a partial three-dimensional structural diagram of the anode and cathode plates of the present invention;

[0030] Figure 8 This is a partial three-dimensional structural diagram of the baffle, L-shaped block, and electric telescopic cylinder of the present invention;

[0031] Figure 9 This is a partial three-dimensional structural diagram of the baffle, main rope, upper plate, and middle plate of the present invention.

[0032] Figure 10 This is a front-view three-dimensional structural diagram of the partially separated front frame, sealing plate, and baffle of the present invention;

[0033] Figure 11 This is a three-dimensional structural diagram of the front frame, sealing plate, and baffle of the present invention after partial separation.

[0034] In the diagram: 1. Electrocatalytic cell; 2. Anode plate; 3. Cathode plate; 4. Processing frame; 5. Middle block; 6. Upper plate; 7. Middle plate; 8. Through groove; 9. Upper inlet pipe; 10. Lower inlet pipe; 11. Rotating shaft; 12. Upper outlet pipe; 13. Lower outlet pipe; 14. Electric telescopic cylinder; 15. Front frame; 16. Sliding plate; 17. Upper rod; 18. L-shaped block; 19. Vertical rod; 20. Upper right-angle block; 21. Upper fixing plate; 22. Upper spring; 23. Pull rope; 24. Main rope; 25. Spiral spring; 26. Side block; 27. Positioning block; 28. Baffle; 29. ​​Middle rod; 30. Squeezing plate; 31. Lower fixing plate; 32. Lower spring; 33. Lower rod; 34. Lower right-angle block; 35. Solenoid valve; 36. Sealing plate; 37. Touch sensor. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0037] In practical use, it was found that existing electrocatalytic cells generally adopt fixed electrode arrays. Once the spacing, number of groups, and water flow path of the anode and cathode are welded or cast, they cannot be adjusted online. After the sewage enters uniformly from the bottom, it only relies on the gap between the electrodes to make a one-time upward flow. The hydraulic retention time is constant and cannot be flexibly matched with fluctuations in influent concentration, flow rate, or discharge standards. When the treatment load suddenly decreases, the excessive retention time leads to power waste and an increase in anode side reactions. When the load increases, insufficient retention reduces the COD removal rate, requiring additional parallel structures, resulting in a double waste of investment and land area. To solve the above problems, the following structure was invented.

[0038] like Figures 1-11 The multi-stage treatment device for industrial oxidation wastewater shown includes an electrocatalytic tank 1, a treatment frame 4 fixedly connected to the inside of the electrocatalytic tank 1, a number of anode plates 2 and cathode plates 3 are staggered in the treatment frame 4, a central block 5 is fixedly connected to the middle of the inside of the treatment frame 4, an upper water inlet pipe 9 and a lower water inlet pipe 10 are fixedly connected through one side of the treatment frame 4, and an upper water outlet pipe 12 and a lower water outlet pipe 13 are fixedly connected through the other side of the treatment frame 4. The anode plates 2 and cathode plates 3 are both L-shaped bent plates. The horizontal section is immersed in the wastewater in the treatment frame 4, and the vertical section extends upward to the liquid surface to form an electrode column, which is fixed at the front and rear of the top of the treatment frame 4, respectively. The electrode column of the anode plate 2 is at the rear, and the electrode column of the cathode plate 3 is at the front. The two are staggered front and back and evenly distributed left and right. This arrangement not only ensures that the water flows evenly through the electrode gap, but also places the conductive contacts above the liquid surface to avoid corrosion and short circuit, and realizes an efficient, safe and easy-to-maintain electrocatalytic reaction space.

[0039] The middle block 5 divides the processing frame 4 into two parts. The upper water inlet pipe 9 and the lower water inlet pipe 10 are respectively set on one side of the two chambers of the processing frame 4 separated by the middle block 5. The upper water inlet pipe 9 is fixedly connected to the bottom of the side wall of the processing frame 4, and the lower water inlet pipe 10 is fixedly connected to the top of the side wall of the processing frame 4. The upper plate 6 is set on the side close to the upper water inlet pipe 9, and the middle plate 7 is set on the side away from the upper water inlet pipe 9.

[0040] The upper water outlet pipe 12 is located opposite the upper water inlet pipe 9, and the lower water outlet pipe 13 is located opposite the lower water inlet pipe 10. The upper water outlet pipe 12 is fixedly connected to the top of the side wall of the treatment frame 4, and the lower water outlet pipe 13 is fixedly connected to the bottom of the side wall of the treatment frame 4.

[0041] Inside the electrocatalytic tank 1, wastewater flows into the treatment frame 4 through the upper inlet pipe 9 and the lower inlet pipe 10. (It should be noted that since the upper inlet pipe 9 and the lower inlet pipe 10 are set on the treatment frame 4 with one above and one below, the water enters the two chambers at different heights, and the outlet positions on the other side are also opposite, ensuring the electrocatalytic effect on the wastewater.) At this time, after the anode plate 2 is energized with direct current, strong oxidants such as hydroxyl radicals and ozone are generated in situ on its surface. These oxidants non-selectively attack the organic matter in the wastewater, causing it to open its rings, break its chains, and decolorize, ultimately mineralizing it into CO2 and water. At the same time, the cathode provides an electron channel, which can reduce heavy metal ions in the water to low valence states or precipitate them out. It can also convert dissolved oxygen into hydrogen peroxide, which synergistically oxidizes residual pollutants. With the anode and cathode arranged alternately, the wastewater flows between the plates, and the active species act rapidly on the surface of the plates and in the micro-areas near the walls. The pollutants are degraded, and COD and color decrease simultaneously, achieving high-efficiency, low-drug, and room-temperature deep treatment.

[0042] A pair of upper plates 6 are provided on both the front and rear sides of the middle block 5, relative to the positions between the anode plate 2 and the cathode plate 3. A middle plate 7 is provided between the upper plates 6. A through groove 8 is provided through the side wall of the middle block 5. A lower groove is provided at the bottom of the through groove 8, relative to the positions between the anode plate 2 and the cathode plate 3. A rotating shaft 11 is rotatably connected to the inner side of the lower groove relative to the positions next to the upper plate 6 and the middle plate 7. The rotating shaft 11 passes through the outer wall of the middle block 5 on both the front and rear sides and is fixedly connected to the side walls of the upper plate 6 and the middle plate 7. A flipping mechanism is also provided for quickly driving the rotating shaft 11 to flip. A pair of front grooves are provided through the front side of the middle block 5. An L-shaped block 18 is provided in each of the front grooves. A baffle 28 is provided through the top of the middle block 5 and is slidably connected. An adjustment mechanism for adjusting the wastewater electrocatalytic process is also provided on the middle block 5.

[0043] The flipping mechanism includes an electric telescopic cylinder 14. A front frame 15 is fixedly connected to the inner side of the front groove. A pair of electric telescopic cylinders 14 are provided, and each electric telescopic cylinder 14 is fixedly connected to the inner side of the front frame 15. A sliding plate 16 is longitudinally slidably connected to the inner side of the through groove 8. An upper rod 17 is fixedly connected to the side wall of the sliding plate 16 relative to the inner side of the front groove. The output ends of the electric telescopic cylinders 14 are fixedly connected to the side wall of the L-shaped block 18. A vertical rod 19 is fixedly connected to the bottom of the L-shaped block 18. An upper right-angle block 20 with an inclined surface is fixedly connected to the side of the vertical rod 19 near the upper rod 17. The inclined surface of the upper right-angle block 20 fits against the outer wall of the upper rod 17. Pull ropes 23 are wound around the outer wall of the rotating shaft 11. One end of each pull rope 23 is fixedly connected to the outer wall of the rotating shaft 11. A main rope 24 is fixedly connected to the bottom end of the sliding plate 16 relative to the upper position of the lower groove. The other end of the main rope 24 extends into the lower groove, and the other end of each pull rope 23 is fixedly connected to the main rope 24.

[0044] An upper fixing plate 21 is fixedly connected to the inner side of the through groove 8 relative to the position above the sliding plate 16. Several upper springs 22 are fixedly connected between the bottom of the upper fixing plate 21 and the top of the sliding plate 16.

[0045] The outer wall of the rotating shaft 11 is provided with a spiral spring 25. One end of the spiral spring 25 is fixedly connected to the outer wall of the rotating shaft 11, and the other end of the spiral spring 25 is fixedly connected to the inner side of the lower groove. Side blocks 26 are fixedly connected to the outer wall of the rotating shaft 11, and positioning blocks 27 are fixedly connected to the inner side of the lower groove relative to the position above the rotating shaft 11.

[0046] When it is necessary to increase the flow time of sewage between the anode plate 2 and the cathode plate 3, the L-shaped block 18 is moved by controlling the electric telescopic cylinder 14 to move it to both sides. At the same time, the vertical rod 19 and the upper right-angle block 20 are moved. Since the upper rod 17 and the sliding plate 16 can only slide longitudinally in the through groove 8, the upper rod 17 and the sliding plate 16 will be pushed upward by the pressure of the inclined surface of the upper right-angle block 20, which will drive the multiple main ropes 24 to move upward and compress the upper spring 22. The upward movement of the multiple main ropes 24 will drive the pull rope 23 to be pulled out from the rotating shaft 11. Since the other end of the pull rope 23 is fixed on the outer wall of the rotating shaft 11, the pulling out of the pull rope 23 will drive the rotating shaft 11 to rotate. At the same time, since one end of the spiral spring 25 is fixed on the rotating shaft 11 and the other end is fixed on the inner side of the lower groove, the spiral spring 25 will be compressed when the rotating shaft 11 rotates.

[0047] The rotation of the shaft 11 causes the upper plate 6 and the middle plate 7 to rotate, and at the same time, the side block 26 rotates. When the side block 26 rotates 90 degrees, it will rotate next to the positioning block 27, thereby restricting the rotation of the shaft 11. At this time, the upper plate 6 and the middle plate 7 have completed a 90-degree rotation and are in a horizontal state. The sewage passing between the anode plate 2 and the cathode plate 3 will flow in an S-shape between the anode plate 2 and the cathode plate 3 under the obstruction of the upper plate 6 and the middle plate 7. Compared with the original straight flow, the flow time is increased. When it is necessary to adjust back, the electric telescopic cylinder 14 is controlled to reset, and the above operation is repeated in reverse.

[0048] In summary, the above structural design enables the adjustment of residence time during wastewater electrocatalysis. By flipping the upper plate 6 and the middle plate 7 by 90 degrees, the system can switch between a straight-through channel and an S-channel. Under low load, it switches to a straight-through channel, allowing water to follow the shortest path and avoiding excessive oxidation and wasted power. Under high load, it switches back to an S-channel, instantly increasing the path length and ensuring sufficient contact time. This results in a stable COD removal rate without the need for additional parallel tanks, greatly improving the flexibility of the device.

[0049] Based on the above embodiments, it was found during use that the above structure can only achieve two-stage adjustment of the flow path between the anode plate 2 and the cathode plate 3, which cannot meet the diverse needs of sewage treatment. In order to solve the above problems, the above structure has been further improved.

[0050] Solenoid valves 35 are installed on both the lower inlet pipe 10 and the upper outlet pipe 12. The solenoid valves 35 are electrically connected to the controller through wires.

[0051] The adjustment mechanism includes a middle rod 29, and a pair of middle rods 29 are provided. The middle rods 29 are fixedly connected to the side wall of the baffle 28 facing the through groove 8. The back side of the L-shaped block 18 is fixedly connected to the pressing plate 30, and the side wall of the pressing plate 30 is inclined (and the inclined surface of the pressing plate 30 is located on the side away from the inclined surface of the upper right angle block 20). The inclined surface of the pressing plate 30 is in contact with the outer wall of the middle rod 29. The inner side of the through groove 8 is fixedly connected to the lower position of the baffle 28. Several lower springs 32 are fixedly connected between the top of the lower fixing plate 31 and the bottom of the baffle 28.

[0052] A lower rod 33 is fixedly connected to the side wall of the sliding plate 16 relative to the position inside the through groove 8, and the lower rod 33 is located on the side away from the upper rod 17. A lower right-angle block 34 with an inclined surface is fixedly connected to the side of the vertical rod 19 close to the lower rod 33, and the lower right-angle block 34 and the upper right-angle block 20 are symmetrically arranged.

[0053] The front frame 15 is sealed with a sealing plate 36 by bolts. A touch sensor 37 is fixedly connected through the rear side of the sealing plate 36. The touch sensor 37 is electrically connected to the controller through a guide.

[0054] When the two cavities of the processing frame 4 need to be connected in series, the electric telescopic cylinder 14 is moved to the middle by controlling it, which in turn drives the extrusion plate 30 to move. Since the baffle 28 can only move up and down, the inclined surface of the extrusion plate 30 will press the middle rod 29 downward under the action of the extrusion plate 30, which will push the baffle 28 to slide down and compress the lower spring 32, thereby releasing the partition between the two cavities of the processing frame 4. During this process, the lower right-angle block 34 will move to the side of the lower rod 33, and the L-shaped block 18 will touch the touch sensor 37. At this time, the touch sensor 37 will transmit the signal to the controller, and the controller will control the two solenoid valves 35 to close, thereby closing the upper water outlet pipe 12 and the lower water inlet pipe 10.

[0055] The wastewater that has been treated in the first cavity of the treatment box 4 will overflow from the middle block 5 and flow into another cavity. After being electrocatalytically treated again by the anode plate 2 and the cathode plate 3, it will be discharged from the bottom outlet pipe 13. If it is necessary to adjust the residence time of the wastewater between the anode plate 2 and the cathode plate 3, the electric telescopic cylinder 14 can be started again to drive the L-shaped block 18 to move towards the middle. At this time, the middle rod 29 moves to the bottom of the extrusion plate 30, and the inclined surface of the lower right-angle block 34 will squeeze the lower rod 33, thereby causing the sliding plate 16 to move upward. By repeating the above operation, the upper plate 6 and the middle plate 7 can be flipped over.

[0056] In summary, through the above structural design, a treatment box 4 is isolated into two parts. The two chambers can be connected in parallel (simultaneous operation when the water volume is large) or in series (secondary deep treatment when the water volume is small). There is no need to build a separate tank, saving half the space. At the same time, when connected in series, the flipping of the upper plate 6 and the middle plate 7 can be adjusted, the path increases instantly, ensuring sufficient contact time for sewage. The COD removal rate is matched with the load in real time, realizing multi-stage treatment of the device.

[0057] A multi-stage treatment method for industrial oxidation wastewater includes the following steps;

[0058] Step 1: Low-grade wastewater is discharged from the upper inlet pipe 9 and the lower inlet pipe 10, enters the space between the anode plate 2 and the cathode plate 3 for electrocatalytic treatment, and is discharged after treatment;

[0059] Step 2: In the middle gear, the control flipping mechanism is started, which drives the upper plate 6 and the middle plate 7 to flip 90 degrees, thereby making the upper plate 6 and the middle plate 7 separate between the anode plate 2 and the cathode plate 3, so that the sewage flows in an S-shape between the anode plate 2 and the cathode plate 3.

[0060] Step 3: The high-end control adjustment mechanism is activated, driving the baffle 28 to move down into the through channel 8, so that the treated wastewater in the first chamber of the treatment frame 4 flows into another chamber, undergoes electrocatalytic treatment again, and is discharged through the lower inlet pipe 10.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention.

[0062] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. An industrial oxidized wastewater multistage treatment device, comprising an electro-catalytic tank (1), a treatment frame (4) is fixedly connected to the inner side of the electro-catalytic tank (1), a plurality of anode sheets (2) and cathode sheets (3) are staggered arranged in the treatment frame (4), characterized in that: The middle part of the processing frame (4) is fixedly connected with a middle block (5), a pair of upper plates (6) are arranged on the front and back sides of the middle block (5) relative to the positions between the anode sheet (2) and the cathode sheet (3), a middle plate (7) is arranged between the upper plates (6), a through groove (8) is longitudinally arranged in the side wall of the middle block (5), a lower groove is arranged in the bottom of the through groove (8) relative to the positions between the anode sheet (2) and the cathode sheet (3), an upper water inlet pipe (9) and a lower water inlet pipe (10) are fixedly connected on one side of the processing frame (4), a rotating shaft (11) is rotatably connected to the inner side of the lower groove relative to the positions beside the upper plate (6) and the middle plate (7), the front and back sides of the rotating shaft (11) are fixedly connected with the outer wall of the middle block (5) and the side wall of the upper plate (6) and the middle plate (7), a turnover mechanism is further arranged for quickly driving the rotating shaft (11) to turn over, a pair of front grooves are longitudinally arranged in the front side of the middle block (5), an L-shaped block (18) is arranged in each of the front grooves, a baffle (28) is sealingly and slidably connected to the top end of the middle block (5), an upper water outlet pipe (12) and a lower water outlet pipe (13) are fixedly connected on the other side of the processing frame (4), and an adjusting mechanism is further arranged on the middle block (5) for adjusting the sewage electro-catalysis process. The turnover mechanism comprises an electric telescopic cylinder (14), a front frame (15) is fixedly connected to the inner side of each of the front grooves, a pair of electric telescopic cylinders (14) are arranged, and the electric telescopic cylinders (14) are fixedly connected to the inner side of the front frame (15), a sliding plate (16) is longitudinally and slidably connected to the inner side of the through groove (8), an upper rod (17) is fixedly connected to the side wall of the sliding plate (16) relative to the position on the inner side of the front groove, the output ends of the electric telescopic cylinders (14) are fixedly connected to the side wall of the L-shaped block (18), a vertical rod (19) is fixedly connected to the bottom of the L-shaped block (18), an upper right-angle block (20) with an inclined surface is fixedly connected to the side of the vertical rod (19) close to the upper rod (17), the inclined surface of the upper right-angle block (20) is attached to the outer wall of the upper rod (17), a pull rope (23) is wound around the outer wall of the rotating shaft (11), one end of the pull rope (23) is fixedly connected to the outer wall of the rotating shaft (11), a main rope (24) is fixedly connected to the bottom end of the sliding plate (16) relative to the position above the lower groove, and the other end of the main rope (24) extends into the lower groove, and the other end of the pull rope (23) is fixedly connected to the main rope (24). The adjusting mechanism comprises a middle rod (29), a pair of middle rods (29) are arranged, and the middle rods (29) are fixedly connected to the side wall of the baffle (28) on the side facing the through groove (8), an extrusion plate (30) is fixedly connected to the back side of the L-shaped block (18), and the side wall of the extrusion plate (30) is inclined, the inclined surface of the extrusion plate (30) is attached to the outer wall of the middle rod (29), a lower fixed plate (31) is fixedly connected to the inner side of the through groove (8) relative to the position below the baffle (28), and a plurality of lower springs (32) are fixedly connected between the top end of the lower fixed plate (31) and the bottom end of the baffle (28).

2. The multi-stage industrial oxidized wastewater treatment device according to claim 1, characterized in that: The middle block (5) separates the treatment frame (4) into two parts, the upper water inlet pipe (9) and the lower water inlet pipe (10) are respectively arranged on the two chambers of the treatment frame (4) separated by the middle block (5), the upper water inlet pipe (9) is fixedly connected at the bottom end of the side wall of the treatment frame (4), the lower water inlet pipe (10) is fixedly connected at the top end of the side wall of the treatment frame (4), the upper plate (6) is arranged on the side close to the upper water inlet pipe (9), and the middle plate (7) is arranged on the side away from the upper water inlet pipe (9).

3. The multi-stage industrial oxidized wastewater treatment device according to claim 1, characterized in that: The upper water outlet pipe (12) is arranged at the position opposite to the upper water inlet pipe (9), the lower water outlet pipe (13) is arranged at the position opposite to the lower water inlet pipe (10), the upper water outlet pipe (12) is fixedly connected at the top end of the side wall of the treatment frame (4), the lower water outlet pipe (13) is fixedly connected at the bottom end of the side wall of the treatment frame (4), and the lower water inlet pipe (10) and the upper water outlet pipe (12) are both provided with electromagnetic valves (35), and the electromagnetic valves (35) are electrically connected between the wires and the controller.

4. The industrial oxidized wastewater multistage treatment device according to claim 1, characterized in that: The upper fixed plate (21) is fixedly connected to the upper position of the sliding plate (16) in the through slot (8).

5. The multi-stage industrial oxidized wastewater treatment device according to claim 1, characterized in that: The outer wall of the rotating shaft (11) is provided with a spiral spring (25), one end of the spiral spring (25) is fixedly connected to the outer wall of the rotating shaft (11), the other end of the spiral spring (25) is fixedly connected to the inner side of the lower groove, the outer wall of the rotating shaft (11) is fixedly connected with a side block (26), and the inner side of the lower groove is fixedly connected with a positioning block (27) above the rotating shaft (11).

6. The industrial oxidized wastewater multistage treatment device according to claim 1, characterized in that: The lower rod (33) is fixedly connected to the inner position of the through slot (8) on the side wall of the sliding plate (16), and the lower rod (33) is arranged on the side away from the upper rod (17).

7. The industrial oxidized wastewater multistage treatment device according to claim 1, characterized in that: The front frame (15) is provided with a blocking plate (36) on the front side through bolt sealing, the blocking plate (36) is provided with a touch sensor (37) fixedly connected at the rear side, and the touch sensor (37) is electrically connected between the guide and the controller.

8. A multi-stage treatment method of industrial oxidized wastewater, which uses the multi-stage treatment apparatus for industrial oxidized wastewater according to any one of claims 1 to 7, characterized by, The steps include: Step one: low-grade, sewage is discharged from the upper water inlet pipe (9) and the lower water inlet pipe (10), enters between the anode sheet (2) and the cathode sheet (3) for electrocatalytic treatment, and is discharged after treatment; Step two: medium-grade, the turning mechanism is started to drive the upper plate (6) and the middle plate (7) to turn by ninety degrees, so that the upper plate (6) and the middle plate (7) are separated between the anode sheet (2) and the cathode sheet (3), and the sewage flowing through the anode sheet (2) and the cathode sheet (3) flows in an S shape. Step three: high-grade, control the operation of the adjusting mechanism, drive the baffle (28) down to the through slot (8), and close the lower inlet pipe (10) and the upper outlet pipe (12), so that the treated sewage in the first chamber of the treatment frame (4) flows into another chamber, and after the second electrocatalytic treatment, it is discharged through the lower outlet pipe (13).

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