High-concentration wastewater treatment process and system

Abstract

The invention discloses a high-concentration wastewater treatment process and system, and relates to the technical field of wastewater treatment.The high-concentration wastewater treatment system comprises an acid precipitation module, an alkali precipitation complex breaking precipitation module, an electrocatalytic oxidation module and a salt-tolerant biochemical device; the electrocatalytic oxidation module comprises a treatment cylinder and an electrode plate, a treatment cavity is formed in the treatment cylinder, the treatment cylinder is provided with a rotating shaft, and the treatment cylinder is provided with a power assembly; the treatment cylinder is provided with an energy assembly; a water inlet pipe is arranged on the wall of the treatment cylinder, a water outlet pipe is arranged on the wall of the treatment cylinder, and the treatment cylinder is provided with a blow-off pipe; the electrode plate comprises a strip plate and a circular plate, the circular plate is arranged on the peripheral side of the rotating shaft, and the strip plate is arranged at the top of the circular plate and extends along a spiral track with the rotating shaft as the circle center; a first water conveying hole and a second water conveying hole are sequentially formed in the upper and lower adjacent circular plates; the circular plates comprise cathode circular plates and anode circular plates, and the cathode circular plates and the anode circular plates are arranged in a vertically spaced and staggered manner; the battens comprise cathode battens and anode battens. The total amount of pollutants can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and in particular to a process and system for treating high-concentration wastewater. Background Technology

[0002] High-concentration wastewater treatment has always been a crucial and highly concerning issue in the environmental protection field. With rapid industrial development and accelerated urbanization, the generation of high-concentration wastewater is increasing daily. This type of wastewater typically features extremely high pollutant concentrations and complex compositions; if discharged directly without effective treatment, it will cause irreversible damage to water bodies, soil, and ecosystems. Therefore, developing efficient and stable high-concentration wastewater treatment technologies is of great significance for environmental protection and maintaining ecological balance.

[0003] For a considerable period, the industry commonly employed a treatment system centered on "biological treatment + membrane deep treatment" for high-concentration wastewater, especially landfill leachate. Specifically, this system first removed most of the biodegradable organic matter and some ammonia nitrogen through anaerobic and aerobic biological processes; then, it used membrane technologies such as nanofiltration or reverse osmosis to deeply purify the effluent, retaining recalcitrant organic matter, heavy metal ions, and other pollutants, thus producing purified water that met discharge standards. This combined process was considered an effective solution for treating high-concentration wastewater at the time.

[0004] However, existing treatment systems have significant drawbacks. Membrane treatment processes generate a certain volume of concentrate, which is enriched with the majority of recalcitrant organic matter, total nitrogen, and heavy metals. The current practice is to reinject this concentrate into landfills, but this approach does not achieve complete removal of pollutants; it merely allows them to transfer and accumulate within the landfill. Long-term reinjection leads to the continuous accumulation of organic matter and ammonia nitrogen in landfills, not only exacerbating the difficulty of treating leachate but also posing a significant risk of groundwater pollution. Furthermore, most landfills in China are now aging, producing leachate with extremely poor biodegradability and an imbalanced carbon-to-nitrogen ratio. This causes a sharp decline in the efficiency of the aforementioned biochemical-based treatment systems. The contradiction between pollutant accumulation caused by reinjection and the increasing difficulty of treatment is becoming increasingly acute, necessitating the development of a new treatment system that can fundamentally reduce the total amount of pollutants. Summary of the Invention

[0005] In order to reduce the total amount of pollutants, this application provides a high-concentration wastewater treatment process and system.

[0006] In a first aspect, this application provides a high-concentration wastewater treatment system, which adopts the following technical solution: A high-concentration wastewater treatment system includes an acid precipitation module, an alkaline precipitation module, an electrocatalytic oxidation module, and a salt-tolerant biochemical module, which are sequentially connected along the wastewater transmission direction. The electrocatalytic oxidation module includes a processing cylinder and an electrode plate. A processing chamber is opened inside the processing cylinder. A rotating shaft extending in the vertical direction is rotatably arranged in the middle of the processing cylinder. The processing cylinder is provided with a power component to drive the rotating shaft to rotate. The electrode plate is disposed on the outer periphery of the rotating shaft. There are multiple electrode plates and they are evenly spaced vertically. The outer periphery of the electrode plate is slidably connected to the periphery wall of the processing cavity. The processing cylinder is provided with an energy component that supplies power to the electrode plate. The treatment cylinder is provided with an inlet pipe located below the electrode plate on its wall, an outlet pipe located above the electrode plate on its wall, and a drain pipe located below the electrode plate on its wall. The electrode plate includes a strip plate and a circular plate. The circular plate is disposed on the outer periphery of the rotating shaft, and the strip plate is disposed on the top of the circular plate. The strip plate extends along a spiral trajectory with the rotating shaft as the center. The upper and lower adjacent circular plates are sequentially provided with a first water inlet and a second water inlet. The first water inlet is offset below the second water inlet. The first water inlet is adjacent to the rotating shaft, and the second water inlet is adjacent to the peripheral wall of the processing chamber. The circular plate includes a cathode circular plate and an anode circular plate, which are arranged vertically and alternately at intervals. The strip includes a cathode strip and an anode strip, with the cathode strip disposed on the cathode circular plate and the anode strip disposed on the anode circular plate.

[0007] By adopting the above technical solutions, the acid precipitation module can adjust the pH of the wastewater to precipitate humic acid and remove part of the COD; the alkaline precipitation module can adjust the pH of the acid precipitate and add sodium carbonate to remove complexed heavy metals and hardness; in the electrocatalytic oxidation module, the power component drives the rotating shaft to rotate, which in turn drives the electrode plate to rotate. The outer periphery of the electrode plate is slidably connected to the periphery of the treatment chamber wall. Combined with the power supply from the energy component, the wastewater can be electrocatalytically oxidized. The inlet pipe is located below the electrode plate and the outlet pipe is located above to facilitate wastewater flow. The sewage pipe can discharge impurities. The extension of the strip plate along the spiral trajectory and the staggered arrangement of the first and second water inlets are conducive to better flow and treatment of wastewater in the treatment chamber, improving the treatment effect; the salt-tolerant biochemical module can further remove COD so that the wastewater meets the discharge standards.

[0008] Optionally, the circular plate has a sliding hole for the strip to slide up and down, and a plurality of limiting blocks are spaced apart on the outer peripheral sidewall of the strip. The sliding hole wall has a limiting groove for the limiting blocks to slide up and down. The wall of the sliding hole is provided with a scraper located at the opening of the hole, and the scraper is slidably connected to the side wall of the strip plate; The processing cylinder is equipped with a control component, which controls the strip plate to circulate above and below the circular plate.

[0009] By adopting the above technical solution, the strip plate can slide up and down in the sliding hole of the circular plate. The limiting block and the limiting groove cooperate to ensure the sliding stability. The scraper can scrape off impurities on the side wall of the strip plate. The control component makes the strip plate circulate and protrude above and below the circular plate, promoting full contact between wastewater and electrode plate, improving electrocatalytic oxidation efficiency, and thus improving the treatment effect of high-concentration wastewater.

[0010] Optionally, the control assembly includes a push block, a control block, an elastic control rope, and a control spring; The control spring is disposed in the limiting groove, and the control spring drives the limiting block to move upward; The pushing block is disposed on the periphery of the processing cavity and corresponds one-to-one with the circular plate. The periphery of the circular plate is provided with a pushing ring groove for the pushing block to slide. The control block slides within the pushing ring groove and corresponds one-to-one with the limiting block. The elastic control rope slides through the circular plate and corresponds one-to-one with the control block. One end of the elastic control rope is connected to the control block, and the other end is connected to the limiting block. When the pushing block pushes the control block to slide in the pushing ring groove, the elastic control rope pulls the limiting block to slide downward. The push ring groove has a receiving slot on the side wall near the rotating shaft that corresponds to the control block; The circular plate has a guide surface that guides the control block to slide into and out of the receiving groove; The control block is inclined and has a sliding surface. When the push block slides on the sliding surface, the control block slides into the receiving groove.

[0011] By adopting the above technical solution, the control components can be used to realize the up-and-down circulating movement of the electrode plates, promote full contact between wastewater and electrode plates, improve the removal efficiency of pollutants in wastewater by the electrocatalytic oxidation module, and at the same time, the scraper can clean the plates, reduce the adhesion of pollutants, and ensure the stable performance of the electrode plates.

[0012] Optionally, a power ring is rotatably connected inside the circular plate, and the power ring is provided with a lower hook that corresponds one-to-one with the limiting block; The side wall of the limiting block is provided with an upper hook that corresponds to and is adapted to the lower hook. The upper hook slides up and down on the circular plate. When the strip protrudes downward from the circular plate, the upper hook engages with the lower hook. The circular plate is equipped with a drive assembly that drives the power ring to reciprocate at intervals along the circumference. The push ring groove wall is provided with a clearance groove. When the upper hook and the lower hook are misaligned, the elastic control rope pulls the control block into the clearance groove. At this time, the push block slides past the control block. The power ring is provided with a push column, and the control block is inclined with a control surface. When the upper hook and the lower hook are aligned with each other, the push column slides on the control surface, pushing the control block to slide out of the clearance groove.

[0013] By adopting the above technical solution, the upper and lower latches are engaged when the strip protrudes downward from the circular plate. The drive component makes the power ring reciprocate in a circumferential manner, which can control the control block to slide into and out of the clearance groove, ensuring the movement coordination between the push block and the control block. This enables the strip to stably achieve the reciprocating movement of protruding upward and downward from the circular plate, which is beneficial to improving the operational stability and treatment effect of the high-concentration wastewater treatment system.

[0014] Optionally, the drive assembly includes a drive rack, a drive gear, a reciprocating lead screw, a drive block, a drive rope, a drive spring, and a connecting block; The connecting block is disposed on the outer periphery of the power ring, the circular plate has a connecting groove for the connecting block to slide, the driving spring is installed in the connecting groove, and the driving spring drives the connecting block to slide towards the upper hook; The reciprocating lead screw is rotatably connected to the circular plate, and the driving block is threadedly connected to the outer periphery of the reciprocating lead screw. The driving block slides up and down inside the circular plate. The drive gear is disposed on the outer periphery of the reciprocating lead screw and rotatably connected to the push ring groove. The drive rack is disposed on the push block. When the push block passes the drive gear, the drive rack meshes with the drive gear. The drive rope slides through the circular plate, and its two ends are respectively connected to the drive block and the connecting block. When the drive block slides upward, the drive rope pulls the connecting block away from the upper hook.

[0015] By adopting the above technical solution, and utilizing the cooperation of the drive rack, drive gear, reciprocating screw, drive block, drive rope, drive spring and connecting block, the power ring can be made to reciprocate along the circumferential direction at intervals, thereby controlling the connection and separation of the upper and lower hooks, so that the strip plate can protrude above and below the circular plate in a set manner to reciprocate, which helps to improve the treatment effect and efficiency of the electrode plate on wastewater.

[0016] Optionally, a slot is provided in the circular plate, and when the control block slides into the clearance slot, the limiting block is locked into the slot.

[0017] By adopting the above technical solution, when the control block slides into the clearance groove, the restriction block is stuck in the groove, which can position the strip and ensure the state of the strip when the control block slides out of the clearance groove.

[0018] Optionally, the energy component includes a cathode ring, a cathode brush, an anode ring, an anode brush, and a mounting post; The cathode ring and the anode ring are rotatably connected to the rotating shaft and are coaxially arranged. The cathode circular plate is arranged on the outer periphery of the cathode ring, and the anode circular plate is arranged on the outer periphery of the anode ring. The mounting post is disposed in the processing cylinder and extends into the rotating shaft, and the mounting post and the rotating shaft are rotatably disposed relative to each other; The cathode brush and the anode brush are respectively disposed on the mounting post, and the cathode brush and the cathode ring are slidably connected.

[0019] By adopting the above technical solution, the cathode ring and anode ring are rotatably connected to the rotating shaft and coaxially arranged, which can ensure the stability of current transmission during the rotation of the electrode plate; the cathode brush and anode brush are slidably connected to the cathode ring and anode ring, respectively, which can continuously supply power to the electrode plate when the rotating shaft rotates, realize the continuous treatment of wastewater by the electrocatalytic oxidation module, and improve the working efficiency and stability of the treatment system.

[0020] Optionally, the power assembly includes a power motor, a power gear, and a connecting gear; The power motor is located at the top of the processing cylinder, the connecting gear is located on the outer periphery of the rotating shaft, the power gear is located on the outer periphery of the output shaft of the power motor, and the power gear meshes with the connecting gear.

[0021] By adopting the above technical solution, the power motor drives the rotating shaft to rotate through the power gear and the connecting gear, so that the electrode plate can rotate in the treatment chamber, which is conducive to the full contact between the wastewater and the electrode plate, enhances the electrocatalytic oxidation effect, and improves the removal efficiency of pollutants in high-concentration wastewater treatment system.

[0022] Optionally, multiple turbulence grooves are formed on the sidewall of the strip.

[0023] By adopting the above technical solution, turbulence is generated when wastewater flows through the turbulence tank, thereby improving the wastewater treatment effect.

[0024] Secondly, this application provides a high-concentration wastewater treatment process, which adopts the following technical solution: A high-concentration wastewater treatment process includes the following steps: S1: Acid precipitation, adjust pH to 1.0, humic acid precipitates, removing 20-30% COD; S2: Alkaline precipitation breaks down the complex and precipitates, acid precipitation adjusts the pH of the effluent to 10.5, and sodium carbonate is added to remove complexed heavy metals and hardness; S3: Electrocatalytic oxidation, water is fed into the treatment cylinder for electrocatalytic oxidation to remove 50% of COD; S4: Salt-tolerant biochemical treatment. After adding a reducing agent to reduce hypochlorous acid, it enters the biochemical treatment process, where COD is further removed to meet emission standards.

[0025] By adopting the above technical solutions, acid precipitation to adjust the pH and precipitate humic acid can remove 20-30% of COD; alkaline precipitation to break the complex and adjust the pH and add sodium carbonate can remove complexed heavy metals and hardness; electrocatalytic oxidation is carried out in the treatment tank and can remove 50% of COD; salt-tolerant biochemical treatment by adding a reducing agent to reduce hypochlorous acid and then performing biochemical treatment can further remove COD and make the wastewater meet the discharge standards.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. The acid precipitation module adjusts the pH to 1.0 to precipitate humic acid, which can remove 20-30% of COD; 2. The electrocatalytic oxidation module performs electrocatalytic oxidation on wastewater, which can remove 50% of COD. Furthermore, the modules in the system are connected in sequence, which can fundamentally reduce the total amount of pollutants and reduce the problems caused by membrane treatment concentrate reinjection. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the external structure of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the internal structure of Embodiment 1 of this application; Figure 3 This is a schematic diagram of the internal structure of the circular plate in Embodiment 1 of this application; Figure 4 yes Figure 2 Enlarged schematic diagram of part A; Figure 5 This is a schematic diagram of the internal cross-section of Embodiment 1 of this application; Figure 6 yes Figure 2 Enlarged schematic diagram of part B; Figure 7 yes Figure 3 Enlarged schematic diagram of part C; Figure 8 This is a schematic diagram of the internal cross-section of the circular plate in Embodiment 1 of this application; Figure 9 yes Figure 8 Enlarged schematic diagram of part D; Figure 10 yes Figure 5 Enlarged schematic diagram of part E.

[0028] Reference numerals: 1. Processing cylinder; 11. Processing chamber; 12. Rotating shaft; 13. Inlet pipe; 14. Outlet pipe; 15. Sewage pipe; 2. Energy component; 21. Cathode ring; 22. Cathode brush; 23. Anode ring; 24. Anode brush; 25. Mounting column; 3. Power component; 31. Power motor; 32. Power gear; 33. Connecting gear; 4. Electrode plate; 41. First water inlet; 42. Second water inlet; 43. Sliding hole; 44. Restricting groove; 45. Scraper; 46. Pushing ring groove; 461. Relief groove; 47. Receiving groove; 48. Guide surface; 5. 51. Cathode strip; 52. Anode strip; 53. Restriction block; 531. Upper hook; 54. Turbulence groove; 6. Circular plate; 61. Cathode circular plate; 62. Anode circular plate; 63. Power ring; 631. Lower hook; 632. Push column; 64. Connecting groove; 65. Slot; 7. Control spring; 71. Push block; 72. Control block; 721. Sliding surface; 722. Control surface; 73. Elastic control rope; 8. Drive rack; 81. Drive gear; 82. Reciprocating screw; 83. Drive block; 84. Drive rope; 85. Drive spring; 86. Connecting block. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0030] This application discloses a high-concentration wastewater treatment system.

[0031] This application mainly adopts "acid precipitation, alkali precipitation, electrocatalytic oxidation and salt-tolerant biochemical treatment of high-concentration wastewater", which achieves the effect of fundamentally reducing the total amount of pollutants in high-concentration wastewater, reducing the transfer and accumulation of pollutants, and reducing the difficulty of treatment and pollution risk. The following is a further detailed description of this application.

[0032] Example 1 See Figure 1This application provides a high-concentration wastewater treatment system, comprising an acid precipitation module, an alkaline precipitation module, an electrocatalytic oxidation module, and a salt-tolerant biochemical module, sequentially connected along the wastewater transport direction. The acid precipitation module, alkaline precipitation module, electrocatalytic oxidation module, and salt-tolerant biochemical module are connected in sequence to treat the high-concentration wastewater in stages. First, the acid precipitation module removes part of the COD; then, the alkaline precipitation module removes complexed heavy metals and hardness; next, the electrocatalytic oxidation module further removes COD; and finally, the salt-tolerant biochemical module meets discharge standards. This staged treatment method gradually reduces pollutants in the wastewater, improves treatment efficiency, achieves full-scale non-membrane treatment, eliminates the need for concentrate refilling into landfills, and thoroughly removes organic matter, total nitrogen, and heavy metals.

[0033] See Figure 1 and Figure 2 Specifically, the electrocatalytic oxidation module includes a processing cylinder 1 and an electrode plate 4. The processing cylinder 1 has a cylindrical processing chamber 11. A rotating shaft 12 extending vertically is rotatably mounted in the middle of the processing cylinder 1, with its central axis coinciding with the central axis of the processing chamber 11. The rotating shaft 12 can be made of metal, such as stainless steel, and its surface is smooth to reduce resistance during rotation.

[0034] The processing cylinder 1 is equipped with a power assembly 3 that drives the rotating shaft 12 to rotate. The power assembly 3 includes a power motor 31, a power gear 32, and a connecting gear 33. The power motor 31 is fixed to the top of the processing cylinder 1 by its own bracket. The connecting gear 33 is fixedly connected to the outer periphery of the rotating shaft 12, and the power gear 32 is fixedly connected to the outer periphery of the output shaft of the power motor 31. The power gear 32 and the connecting gear 33 mesh with each other. The power motor 31 can be a common three-phase asynchronous motor, and the power gear 32 and the connecting gear 33 can be made of alloy steel, which has high strength and wear resistance. After the power motor 31 starts, it drives the rotating shaft 12 to rotate through the meshing of the power gear 32 and the connecting gear 33. In this embodiment, the power motor 31 moves at a low speed.

[0035] See Figure 2 and Figure 3 Electrode plates 4 are fixedly connected to the outer periphery of the rotating shaft 12. Multiple electrode plates 4 are evenly spaced vertically. The outer periphery of the electrode plates 4 is slidably connected to the periphery of the processing chamber 11. Each electrode plate 4 includes a strip plate 5 and a circular plate 6. The circular plate 6 is located on the outer periphery of the rotating shaft 12, and the strip plate 5 is located on top of the circular plate 6. The strip plate 5 extends along a spiral trajectory with the rotating shaft 12 as its center. The top of the strip plate 5 is slidably connected to the bottom of the adjacent circular plate 6 above it, and the top of the uppermost strip plate 5 is slidably connected to the top wall of the processing chamber 11.

[0036] The circular plate 6 includes a cathode circular plate 61 and an anode circular plate 62, which are arranged vertically and alternately; the strip plate 5 includes a cathode strip plate 51 and an anode strip plate 52, with the cathode strip plate 51 disposed on the cathode circular plate 61 and the anode strip plate 52 disposed on the anode circular plate 62.

[0037] See Figure 2 and Figure 4 The processing cylinder 1 is equipped with an energy component 2 for supplying power to the cathode circular plate 61 and the anode circular plate 62. The energy component 2 includes a cathode ring 21, a cathode brush 22, an anode ring 23, an anode brush 24, and a mounting post 25. The cathode ring 21 and anode ring 23 are rotatably connected to a rotating shaft 12 and are coaxially arranged. A rotating groove is formed inside the rotating shaft 12, and the inner diameter of the cathode ring 21 and anode ring 23 is equal to the diameter of the rotating groove. The cathode circular plate 61 is fixedly connected to the outer periphery of the cathode ring 21, and the anode circular plate 62 is fixedly connected to the outer periphery of the anode ring 23. The mounting post 25 is fixedly connected to the processing cylinder 1 and extends into the rotating groove, and is rotatably arranged relative to the rotating shaft 12. The cathode brush 22 and anode brush 24 are fixedly connected to the mounting post 25. The cathode brush 22 and cathode ring 21 are slidably connected and correspond one-to-one, and the anode brush 24 and anode ring 23 are slidably connected and correspond one-to-one. The upper and lower cathode brushes 22 are connected to an external power source via cathode wires, and the upper and lower anode brushes 24 are connected to an external power source via anode wires. In use, power is supplied to the electrode plates 4 through the energy component 2, so that the cathode circular plate 61 and anode circular plate 62, and the cathode strip plate 51 and anode strip plate 52 form an electric field to electrocatalytically oxidize pollutants in wastewater.

[0038] A water inlet pipe 13 is fixedly connected to the wall of the treatment cylinder 1, located below the electrode plate 4, for introducing wastewater treated by the adjacent module into the treatment chamber 11. A drain pipe 15 is fixedly connected to the wall of the treatment cylinder 1, located below the electrode plate 4, for discharging sediment deposited at the bottom of the treatment chamber 11. A water outlet pipe 14 is fixedly connected to the wall of the treatment cylinder 1, located above the electrode plate 4, for transferring the treated wastewater in the treatment chamber 11 to the next connected module.

[0039] The inlet pipe 13, outlet pipe 14, and sewage pipe 15 can be made of corrosion-resistant plastic pipes, such as PVC pipes. During wastewater treatment, wastewater enters the treatment cylinder 1 through the inlet pipe 13, is treated by the electrode plate 4, and then flows out through the outlet pipe 14. The sediment generated during the treatment process is discharged through the sewage pipe 15.

[0040] See Figure 5The upper and lower adjacent circular plates 6 are sequentially provided with a first water inlet 41 and a second water inlet 42. The first water inlet 41 is radially offset below the second water inlet 42. The first water inlet 41 is adjacent to the rotating shaft 12, and the second water inlet 42 is adjacent to the periphery of the treatment chamber 11. The arrangement of the first water inlet 41 and the second water inlet 42 creates a tortuous flow path for the wastewater in the treatment chamber 11, increasing the contact time between the wastewater and the electrode plate 4. Furthermore, the turbulence groove 54 formed on the side wall of the strip plate 5 improves the electrocatalytic oxidation effect.

[0041] See Figure 5 and Figure 6 The circular plate 6 has a sliding hole 43 for the strip plate 5 to slide up and down. A plurality of limiting blocks 53 are fixed at intervals on the outer peripheral wall of the strip plate 5 adjacent to the circumferential wall of the processing chamber 11. The wall of the sliding hole 43 has a limiting groove 44 for the limiting blocks 53 to slide up and down. Two scraper strips 45 are fixedly connected to the wall of the sliding hole 43 and are respectively adjacent to the opening of the sliding hole 43. The scraper strips 45 are slidably connected to the side wall of the strip plate 5.

[0042] The processing cylinder 1 is equipped with a control component, which controls the reciprocating motion of the control bar 5 above and below the protruding circular plate 6. The control component includes a pusher block 71 (the pusher block 71 is located in...). Figure 7 The control includes a control block 72, an elastic control rope 73, and a control spring 7. The control spring 7 is installed in the limiting groove 44, with its top abutting against the bottom of the limiting block 53 and its bottom abutting against the bottom of the limiting groove 44. When the control spring 7 is released elastically, it drives the limiting block 53 to move upward, at which point the strip 5 protrudes upward beyond the circular plate 6.

[0043] See Figure 6 and Figure 7 A push block 71 is fixedly connected to the circumferential wall of the processing chamber 11, and each push block 71 corresponds to a circular plate 6. A circumferentially extending push ring groove 46 is formed on the circumferential side wall of the circular plate 6, and the push block 71 is slidably connected within the push ring groove 46. A control block 72 slides within the push ring groove 46, and each control block 72 corresponds to a limiting block 53. An elastic control rope 73 slides through the circular plate 6, and each elastic control rope 73 corresponds to a control block 72. One end of the elastic control rope 73 is fixedly connected to the control block 72, and the other end is fixedly connected to the limiting block 53. When the push block 71 pushes the control block 72 to slide within the push ring groove 46, the elastic control rope 73 pulls the limiting block 53 downwards. A receiving groove 47 is formed on the side wall of the push ring groove 46 near the rotating shaft 12, and each receiving groove 47 corresponds to a control block 72. The circular plate 6 has a guide surface 48, and the control block 72 slides on the guide surface 48, so that the control block 72 can slide into and out of the receiving groove 47. The control block 72 has a sliding surface 721 at an angle, and when the push block 71 slides, the control block 72 slides into the receiving groove 47.

[0044] See Figure 6 and Figure 8 A power ring 63 is rotatably connected inside the circular plate 6. A lower hook 631 is fixedly connected to the power ring 63, and there are multiple lower hooks 631, each corresponding to a limiting block 53. An upper hook 531, corresponding to and adapted to the lower hooks 631, is fixedly connected to the side wall of the limiting block 53. The upper hooks 531 slide up and down on the circular plate 6. Both the upper and lower hooks 631 have a certain elastic deformation capacity. When the strip 5 protrudes downwards from the circular plate 6, the upper hook 531 engages with the lower hook 631. In this embodiment, since the strip 5 extends along a spiral trajectory, the length of the upper hook 531 along the spiral trajectory of the strip 5 gradually increases.

[0045] See Figure 6 and Figure 7 The circular plate 6 is equipped with a drive assembly for driving the power ring 63 to reciprocate circumferentially at intervals. The push ring groove 46 has a clearance groove 461 in its groove wall. When the upper hook 531 and lower hook 631 are misaligned, the elastic control rope 73 pulls the control block 72 into the clearance groove 461, at which point the push block 71 slides past the control block 72. The circular plate 6 has a retaining groove 65. When the control block 72 slides into the clearance groove 461, the limiting block 53 engages in the retaining groove 65. A push column 632 is fixedly connected to the bottom of the power ring 63. The control block 72 has a control surface 722 at an angle. When the power ring 63 rotates circumferentially until the upper hook 531 and the lower hook 631 are aligned with each other, the push column 632 slides on the control surface 722, pushing the control block 72 to slide out of the clearance groove 461. At this time, the state of the restriction block 53 is maintained by the structure of the limiting block 53 being inserted into the slot 65, the elastic release of the control spring 7, and the elastic control rope 73.

[0046] See Figure 7 and Figure 9 The drive assembly includes a drive rack 8, a drive gear 81, a reciprocating lead screw 82, a drive block 83, a drive rope 84, a drive spring 85, and a connecting block 86. The connecting block 86 is fixedly connected to the outer periphery of the power ring 63. The circular plate 6 has a connecting groove 64, and the connecting block 86 slides in the connecting groove 64. The drive spring 85 is installed in the connecting groove 64, and one end of the drive spring 85 abuts against the connecting block 86 away from the upper latch 531 (the upper latch 531 is in...). Figure 7 One end of the drive block (marked out) rests against the wall of the connecting groove 64. When the drive spring 85 is released elastically, the drive connecting block 86 slides toward the upper hook 531.

[0047] See Figure 9 The reciprocating screw 82 is rotatably connected to the circular plate 6. The reciprocating screw 82 extends in the vertical direction, and the drive block 83 is threadedly connected to the outer circumference of the reciprocating screw 82.

[0048] See Figure 7 and Figure 8 The drive rack 8 is fixed to the side wall of the push block 71 near the rotating shaft 12, and the drive gear 81 is fixed to the outer circumference of the reciprocating screw 82 and rotatably connected to the push ring groove 46. When the drive rack 8 passes the drive gear 81, the drive rack 8 drives the drive gear 81 to rotate, causing the reciprocating screw 82 to rotate, and the drive block 83 to slide up and down within the circular plate 6. The drive rope 84 slides through the circular plate 6, and its two ends are respectively connected and fixed to the drive block 83 and the connecting block 86. When the drive block 83 slides upward, the drive rope 84 pulls the connecting block 86 away from the upper hook 531 (the upper hook 531 is in...). Figure 6 (The selected section is marked), at this time the drive spring 85 is elastically compressed; when the drive block 83 slides downward, the drive rope 84 is relaxed, at this time the drive spring 85 is elastically released, pushing the connecting block 86 closer to the upper hook 531. In use, through the cooperation of the control component and the drive component, the strip 5 (the strip 5 is in...) Figure 6 The electrode plate 45 (marked out) can intermittently protrude above and below the circular plate 6, and the scraper 45 can scrape off impurities attached to the strip plate 5, ensuring that the electrode plate 4 (electrode plate 4 is in) Figure 5 The processing effect of (the winning bid).

[0049] The implementation principle of a high-concentration wastewater treatment system according to Embodiment 1 of this application is as follows: High-concentration wastewater is treated sequentially through an acid precipitation module, an alkaline precipitation module, an electrocatalytic oxidation module, and a salt-tolerant biochemical module. In the electrocatalytic oxidation module, the power unit 3 drives the rotating shaft 12 to rotate, which in turn rotates the electrode plates 4. The energy unit 2 supplies power to the electrode plates 4, creating an electric field to electrocatalytically oxidize the wastewater. The wastewater enters the treatment cylinder 1 through the inlet pipe 13 and flows in a zigzag pattern between the electrode plates 4 through the first and second water inlets 41 and 42, increasing the contact time with the electrode plates 4. The control and drive components control the up-and-down movement of the scraper plates 5, and the scraper 45 removes impurities from the plates 5, ensuring effective treatment. This treatment system effectively reduces the total amount of pollutants in high-concentration wastewater, reduces the problem of pollutant transfer and accumulation in existing treatment systems, lowers the treatment difficulty and the risk of groundwater pollution, and improves treatment efficiency and stability, which is of great significance for environmental protection.

[0050] Example 2 This application provides a high-concentration wastewater treatment process, including the following steps: Step 1: Acid precipitation to adjust pH to 1.0, humic acid precipitates, removing 20-30% of COD. In this step, a pH adjuster, such as sulfuric acid, can be used to adjust the pH of the wastewater to 1.0. During the adjustment process, a pH meter needs to be used to monitor the pH change in real time to ensure the accuracy of the adjustment. Through acid precipitation, substances such as humic acid in the wastewater precipitate out, forming a precipitate, which is then removed through precipitation separation, thereby reducing the COD content in the wastewater.

[0051] Step Two: Alkaline precipitation to break up the complex and remove precipitates; adjust the pH of the acid-precipitated effluent to 10.5 and add sodium carbonate to remove complexed heavy metals and hardness. Alkaline substances such as sodium hydroxide can be used to adjust the pH of the acid-precipitated effluent to 10.5, while sodium carbonate is added in a specific ratio. After adding sodium carbonate, it reacts with the complexed heavy metals and hardness components in the wastewater to form precipitates, which are then removed through precipitation separation.

[0052] Step 3: Electrocatalytic oxidation. Water is fed into treatment cylinder 1 for electrocatalytic oxidation to remove 50% of the COD. Wastewater that has undergone alkaline precipitation and complex breaking treatment is fed into treatment cylinder 1 of the electrocatalytic oxidation module through inlet pipe 13. Inside treatment cylinder 1, power component 3 drives rotating shaft 12 to rotate, which in turn rotates electrode plates 4. Energy component 2 supplies power to electrode plates 4, forming an electric field to electrocatalytically oxidize the wastewater. The wastewater flows in a tortuous manner between electrode plates 4, ensuring full contact with them. Through the electrocatalytic oxidation reaction, COD in the wastewater is further removed.

[0053] Step Four: Salt-Tolerant Biochemical Treatment. A reducing agent is added to reduce hypochlorous acid before the wastewater enters the biochemical treatment unit. Through this process, COD is further removed to meet emission standards. In the salt-tolerant biochemical module, a reducing agent, such as sodium sulfite, is first added to reduce the hypochlorous acid in the wastewater, preventing it from harming the microorganisms involved in the biochemical treatment. Then, the wastewater is introduced into the biochemical treatment unit, where salt-tolerant microorganisms decompose and metabolize the organic matter in the wastewater, further removing COD and ensuring the wastewater meets emission standards.

[0054] The implementation principle of a high-concentration wastewater treatment process in Embodiment 2 of this application is as follows: This treatment process employs four steps: acid precipitation, alkaline precipitation to break down complexes, electrocatalytic oxidation, and salt-tolerant biochemical treatment. Acid precipitation removes some COD, alkaline precipitation removes complexed heavy metals and reduces hardness, electrocatalytic oxidation further removes a significant amount of COD, and salt-tolerant biochemical treatment ultimately brings the wastewater up to standard. This combined approach leverages the advantages of chemical precipitation, electrocatalytic oxidation, and biochemical treatment, effectively addressing existing problems in treatment systems and improving the treatment efficiency and stability of high-concentration wastewater.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-concentration wastewater treatment system, characterized in that: It includes an acid precipitation module, an alkaline precipitation module, an electrocatalytic oxidation module, and a salt-tolerant biochemical module, which are sequentially connected along the wastewater transmission direction. The electrocatalytic oxidation module includes a processing cylinder (1) and an electrode plate (4). The processing cylinder (1) has a processing chamber (11) inside. A rotating shaft (12) extending vertically is rotatably arranged in the middle of the processing cylinder (1). The processing cylinder (1) is provided with a power component (3) to drive the rotating shaft (12) to rotate. The electrode plate (4) is disposed on the outer periphery of the rotating shaft (12). There are multiple electrode plates (4) and they are evenly spaced vertically. The outer periphery of the electrode plate (4) is slidably connected to the periphery wall of the processing cavity (11). The processing cylinder (1) is provided with an energy component (2) that supplies power to the electrode plate (4). The treatment cylinder (1) has an inlet pipe (13) located below the electrode plate (4) on its cylinder wall, an outlet pipe (14) located above the electrode plate (4) on its cylinder wall, and a drain pipe (15) located below the electrode plate (4) on its cylinder wall. The electrode plate (4) includes a strip plate (5) and a circular plate (6). The circular plate (6) is disposed on the outer periphery of the rotating shaft (12), and the strip plate (5) is disposed on the top of the circular plate (6). The strip plate (5) extends along a spiral trajectory with the rotating shaft (12) as the center. The upper and lower adjacent circular plates (6) are sequentially provided with a first water inlet (41) and a second water inlet (42). The first water inlet (41) is offset below the second water inlet (42). The first water inlet (41) is adjacent to the rotating shaft (12), and the second water inlet (42) is adjacent to the periphery of the processing chamber (11). The circular plate (6) includes a cathode circular plate (61) and an anode circular plate (62), which are arranged vertically and alternately. The strip (5) includes a cathode strip (51) and an anode strip (52). The cathode strip (51) is disposed on the cathode circular plate (61), and the anode strip (52) is disposed on the anode circular plate (62).

2. The high-concentration wastewater treatment system according to claim 1, characterized in that: The circular plate (6) has a sliding hole (43) for the strip plate (5) to slide up and down. The outer peripheral sidewall of the strip plate (5) is provided with a plurality of limiting blocks (53) at intervals. The wall of the sliding hole (43) has a limiting groove (44) for the limiting block (53) to slide up and down. The wall of the sliding hole (43) is provided with a scraper (45) located at the opening of the hole, and the scraper (45) is slidably connected to the side wall of the strip plate (5); The processing cylinder (1) is equipped with a control component, which controls the strip (5) to circulate above and below the circular plate (6).

3. The high-concentration wastewater treatment system according to claim 2, characterized in that: The control assembly includes a push block (71), a control block (72), an elastic control rope (73), and a control spring (7); The control spring (7) is disposed in the limiting groove (44), and the control spring (7) drives the limiting block (53) to move upward; The push block (71) is disposed on the periphery of the processing cavity (11) and corresponds one-to-one with the circular plate (6). The periphery of the circular plate (6) is provided with a push ring groove (46) for the push block (71) to slide. The control block (72) slides in the push ring groove (46) and corresponds one-to-one with the limiting block (53). The elastic control rope (73) slides through the circular plate (6) and corresponds one-to-one with the control block (72). One end of the elastic control rope (73) is connected to the control block (72) and the other end is connected to the limiting block (53). When the push block (71) pushes the control block (72) to slide in the push ring groove (46), the elastic control rope (73) pulls the limiting block (53) to slide downward; The push ring groove (46) has a receiving groove (47) on the side wall near the rotating shaft (12) that corresponds to the control block (72). The circular plate (6) has a guide surface (48) that guides the control block (72) to slide into and out of the receiving groove (47). The control block (72) has a sliding surface (721) at an angle. When the push block (71) slides on the sliding surface (721), the control block (72) slides into the receiving groove (47).

4. The high-concentration wastewater treatment system according to claim 3, characterized in that: The circular plate (6) is rotatably connected to a power ring (63), and the power ring (63) is provided with a lower hook (631) that corresponds one-to-one with the limiting block (53). The side wall of the limiting block (53) is provided with an upper hook (531) that corresponds to and is adapted to the lower hook (631). The upper hook (531) slides up and down on the circular plate (6). When the strip (5) protrudes downward from the circular plate (6), the upper hook (531) is engaged with the lower hook (631). The circular plate (6) is provided with a drive assembly that drives the power ring (63) to reciprocate in a circumferential manner at intervals; The push ring groove (46) has a clearance groove (461) on its groove wall. When the upper hook (531) and the lower hook (631) are misaligned, the elastic control rope (73) pulls the control block (72) into the clearance groove (461), and at this time the push block (71) slides past the control block (72). The power ring (63) is provided with a push column (632), and the control block (72) is inclined to have a control surface (722). When the upper hook (531) and the lower hook (631) are aligned with each other, the push column (632) slides on the control surface (722) and pushes the control block (72) to slide out of the relief groove (461).

5. A high-concentration wastewater treatment system according to claim 4, characterized in that: The drive assembly includes a drive rack (8), a drive gear (81), a reciprocating lead screw (82), a drive block (83), a drive rope (84), a drive spring (85), and a connecting block (86). The connecting block (86) is disposed on the outer periphery of the power ring (63), and the circular plate (6) has a connecting groove (64) for the connecting block (86) to slide. The driving spring (85) is installed in the connecting groove (64), and the driving spring (85) drives the connecting block (86) to slide towards the upper hook (531). The reciprocating lead screw (82) is rotatably connected to the circular plate (6), and the driving block (83) is threadedly connected to the outer periphery of the reciprocating lead screw (82). The driving block (83) slides up and down inside the circular plate (6). The drive gear (81) is disposed on the outer periphery of the reciprocating screw (82) and rotatably connected in the push ring groove (46). The drive rack (8) is disposed on the push block (71). When the push block (71) passes the drive gear (81), the drive rack (8) meshes with the drive gear (81). The drive rope (84) slides through the circular plate (6). The two ends of the drive rope (84) are respectively connected to the drive block (83) and the connecting block (86). When the drive block (83) slides upward, the drive rope (84) pulls the connecting block (86) away from the upper hook (531).

6. A high-concentration wastewater treatment system according to claim 5, characterized in that: The circular plate (6) has a slot (65) inside. When the control block (72) slides into the clearance slot (461), the limiting block (53) is locked into the slot (65).

7. A high-concentration wastewater treatment system according to claim 1, characterized in that: The energy component (2) includes a cathode ring (21), a cathode brush (22), an anode ring (23), an anode brush (24), and a mounting post (25). The cathode ring (21) and the anode ring (23) are rotatably connected to the rotating shaft (12) and coaxially arranged. The cathode circular plate (61) is arranged on the outer periphery of the cathode ring (21), and the anode circular plate (62) is arranged on the outer periphery of the anode ring (23). The mounting post (25) is disposed in the processing cylinder (1) and extends into the rotating shaft (12), and the mounting post (25) and the rotating shaft (12) are rotatably disposed relative to each other; The cathode brush (22) and the anode brush (24) are respectively disposed on the mounting post (25). The cathode brush (22) is slidably connected to the cathode ring (21), and the anode brush (24) is slidably connected to the anode ring (23).

8. A high-concentration wastewater treatment system according to claim 1, characterized in that: The power assembly (3) includes a power motor (31), a power gear (32), and a connecting gear (33). The power motor (31) is located on the top of the processing cylinder (1), the connecting gear (33) is located on the outer periphery of the rotating shaft (12), the power gear (32) is located on the outer periphery of the output shaft of the power motor (31), and the power gear (32) meshes with the connecting gear (33).

9. A high-concentration wastewater treatment system according to claim 1, characterized in that: Multiple turbulence grooves (54) are formed on the side wall of the strip (5).

10. A high-concentration wastewater treatment process, employing a high-concentration wastewater treatment system as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Acid precipitation, adjust pH to 1.0, humic acid precipitates, removing 20-30% COD; S2: Alkaline precipitation breaks down the complex and precipitates, acid precipitation adjusts the pH of the effluent to 10.5, and sodium carbonate is added to remove complexed heavy metals and hardness; S3: Electrocatalytic oxidation, water is fed into the treatment cylinder (1) for electrocatalytic oxidation to remove 50% of COD; S4: Salt-tolerant biochemical treatment. After adding a reducing agent to reduce hypochlorous acid, it enters the biochemical treatment process, where COD is further removed to meet emission standards.

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