A nitrification wastewater treatment device and method

Abstract

The invention relates to a nitrification wastewater treatment device and method. The invention comprises an aerobic treatment system, wherein the aerobic treatment system is connected with an anaerobic treatment system and a Fenton treatment system, and the nitrification wastewater passes through the anaerobic treatment system, the aerobic treatment system and the Fenton treatment system in sequence; the aerobic treatment system comprises an aerobic tank and a secondary sedimentation tank, and a return pipe is connected between the aerobic tank and the secondary sedimentation tank; a return pipe is also connected between the aerobic tank and the anaerobic treatment system; strip-shaped notches are arranged on the return pipes, and dredging devices are arranged at the strip-shaped notches, and the dredging devices can clean and dredge the return pipes; the invention has the beneficial effects that the dredging devices can clean and dredge the return pipes, and when the return pipes are blocked, the dredging devices can dredge the sludge in the pipes.

Description

Technical Field

[0001] The present invention relates to the field of industrial wastewater treatment, and specifically to a nitrification wastewater treatment device and method. Background Art

[0002] Phenol-containing wastewater is a kind of industrial wastewater with a wide range of sources and serious hazards. Nitrophenol contains a strong electron-withdrawing nitro group in its molecular structure, which greatly reduces the electron cloud density on the benzene ring and enhances its stability. It is difficult to degrade in nature. The treatment of nitrophenol-containing wastewater is still a difficult problem in sewage treatment.

[0003] In the prior art, a biochemical treatment method for benzene or toluene nitrification wastewater is disclosed, and its document number is: CN109956619A. The wastewater is adjusted to pH7 or pH8 with acid or alkali, and is pumped to an anaerobic reactor. The nitrification wastewater is kept in the anaerobic reactor for a certain residence time. The nitro substances in the nitrification wastewater are reduced to anilines, and some phenols are ring-opened and cracked into methane, hydrogen and water, etc. After the anaerobic reaction, nitrophenols are reduced to anilines or degraded into simple low-molecular or low-energy compounds, and the biological toxicity is greatly reduced. The phenolic wastewater without nitro enters the aerobic tank and is biodegraded. The nitrification wastewater after degradation enters the sterilization tank, and then flocculates and precipitates, which can meet the national emission standards.

[0004] However, in the above scheme, a sludge return pipe is provided in the anaerobic reactor, and the sludge in the return pipe can easily cause the pipe to be blocked. Summary of the invention

[0005] The invention provides a nitrification wastewater treatment device and method which are unlikely to cause pipeline blockage.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a digestion wastewater treatment device, including an aerobic treatment system, the aerobic treatment system is connected to an anaerobic treatment system and a Fenton treatment system, and the nitrification wastewater is treated by the anaerobic treatment system, the aerobic treatment system and the Fenton treatment system in sequence;

[0007] The aerobic treatment system comprises an aerobic tank and a secondary sedimentation tank, and a reflux pipeline is connected between the aerobic tank and the secondary sedimentation tank;

[0008] A return pipe is also connected between the aerobic tank and the anaerobic treatment system;

[0009] The reflux pipe is provided with a strip notch and an oblique support arm, there are two oblique support arms, the strip notch is located between the two oblique support arms, the upper end of the oblique support arm is connected with a fixed pulley, and a dredging device is provided at the strip notch, and the dredging device can clean and dredge the reflux pipe;

[0010] The dredging device comprises a blocking component and a dredging component, wherein the blocking component and the dredging component are connected via a connecting rope, and a fixed pulley supports the connecting rope, and when the dredging component moves, the blocking component can be driven to move.

[0011] Furthermore, the blocking assembly includes a blocking strip and a splint. The blocking strip blocks the strip-shaped gap. There are two splints, which are arranged in parallel. The blocking strip is located between the two splints, and the splint is connected to the lower end of the connecting rope.

[0012] Furthermore, the blocking strip comprises a fixed block and a movable block, there are two movable blocks, the fixed block is located between the two movable blocks, the fixed block is fixedly connected to the clamping plate, and the movable block is slidably connected to the clamping plate.

[0013] Furthermore, an arc-shaped guide plate is provided on the upper surface of the moving block, and the guide plate extends in a direction away from the fixed block.

[0014] Furthermore, the clamping plate is connected to a fixed rod group fixed on the reflux pipe, the fixed rod group includes two fixed rods, and a limiting rod is connected between the upper ends of the two fixed rods. When the clearing assembly drives the blocking assembly to move upward until the guide plate contacts the limiting rod, the moving block moves in a direction away from the fixed block.

[0015] Furthermore, a vertical plate is fixed on the clamping plate, the vertical plate is located between the two clamping plates, and a spring is arranged on the end surface of each vertical plate, and the spring is located between the vertical plate and the moving block.

[0016] Furthermore, the dredging component includes a horizontal plate, and two dredging arms are fixedly connected to the lower surface of the horizontal plate, and the horizontal plate is connected to the upper end of the connecting rope.

[0017] Furthermore, the anaerobic treatment system includes a water distribution tank and an anaerobic settling tank, and a PEIC anaerobic reaction tower is connected between the water distribution tank and the anaerobic settling tank.

[0018] Furthermore, the Fenton treatment system includes a pH adjustment tank, a first Fenton reaction tank, a second Fenton reaction tank and a subsequent treatment system, which are connected in sequence. The subsequent treatment system includes a Fenton neutralization tank, a Fenton degassing tank, a Fenton flocculation tank and a Fenton sedimentation tank, which are also connected in sequence.

[0019] A method for treating nitrification wastewater comprises the following steps:

[0020] S1: Nitrification wastewater is heated in the water distribution tank to meet the anaerobic water inlet conditions, and the temperature at this time is 35±3℃;

[0021] S2: Nitrification wastewater that meets the anaerobic water inlet conditions is introduced into the PEIC anaerobic reaction tower, and the organic matter in the wastewater is decomposed into small molecular organic matter and biogas under the action of anaerobic bacteria;

[0022] S3: passing the wastewater into a sedimentation tank to precipitate the sediment in the wastewater;

[0023] S4: passing the wastewater into an aerobic pool, where aerobic bacteria further purify the wastewater and decompose it into carbon dioxide and water;

[0024] S5: The wastewater after the aerobic tank treatment is passed to the secondary sedimentation tank, and the secondary sedimentation tank separates the mixed liquid into mud and water, separating the activated sludge and the supernatant;

[0025] S6: passing the supernatant into a pH adjustment tank, and adjusting the pH value of the supernatant to between 3.0 and 4.0 using sulfuric acid;

[0026] S7: introducing the pH-adjusted supernatant into the first Fenton reaction tank, adding ferrous sulfate and mixing evenly;

[0027] S8: passing the supernatant into the second Fenton reaction tank, adding hydrogen peroxide, and performing Fenton catalytic oxidation reaction;

[0028] S9: The wastewater after oxidation reaction flows into the Fenton neutralization tank, and alkali solution is added for neutralization reaction, and adjusted to neutrality so that the pH value of the wastewater meets the effluent standard;

[0029] S10: The wastewater after neutralization reaction enters the Fenton degassing tank to remove bubbles in the wastewater;

[0030] S11: The wastewater after degassing reaction is flowed to the Fenton flocculation tank by gravity, and a flocculant is added to stir, so that the flocculation reaction is fully carried out and the iron sludge in the wastewater is flocculated;

[0031] S12: Finally, the wastewater after flocculation reaction flows into the Fenton sedimentation tank to precipitate the iron sludge therein.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows: the device is provided with an aerobic treatment system, the aerobic treatment system is connected with an anaerobic treatment system and a Fenton treatment system, the nitrification wastewater passes through the anaerobic treatment system, the aerobic treatment system and the Fenton treatment system in sequence, a return pipe is provided inside the aerobic treatment system, a return pipe is also connected between the aerobic treatment system and the anaerobic treatment system, strip notches are provided on the return pipes, a dredging device is provided at the strip notches, the dredging device can clean and dredge the return pipe, and when the return pipe is blocked, the dredging device can dredge the sludge in the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a process flow chart of the present invention;

[0034] Figure 2 This is a schematic diagram of the main structure of the dredging device of the present invention;

[0035] Figure 3 This is a left-side structural schematic diagram of the connection between the plugging assembly and the pipeline of the present invention;

[0036] Figure 4 This is a schematic diagram of the top view of the connection between the plugging assembly and the pipeline of the present invention;

[0037] Figure 5 This is a schematic diagram of the connection structure between the blocking strip and the splint of the present invention;

[0038] Figure 6 This is a schematic diagram of the main view of the dredging device of the present invention when it is working;

[0039] Figure 7 This is a schematic diagram of the connection structure between the blocking strip and the splint when the present invention is working;

[0040] Figure 8 The process flow chart of the Fenton reaction system of the present invention is as follows;

[0041] Fig. 9 This is a schematic diagram of the connection structure between the blocking strip and the clamping plate when another embodiment of the present invention is working;

[0042] Fig.10 It is a left-side structural schematic diagram of a dredging arm according to another embodiment of the present invention;

[0043] 1- anaerobic treatment system, 2- aerobic treatment system, 3- Fenton reaction system, 4- PEIC anaerobic reaction tower, 5- water distribution tank, 6- water pump, 7- anaerobic sedimentation tank, 8- dry desulfurization tower, 9- condensation water tank, 10- aerobic tank, 11- secondary sedimentation tank, 12- splint, 13- strip notch, 14- fixed rod, 15- limit rod, 16- fixed block, 17- moving block, 18- slide, 19- convex strip, 20- diagonal support arm, 21- fixed pulley, 22- Pull rope, 23-lifting ring, 24-connecting rope, 25-horizontal plate, 26-dredging arm, 27-guide plate, 28-vertical plate, 29-compression return spring, 30-threaded rod, 31-PH adjustment tank, 32-first Fenton reaction tank, 33-second Fenton reaction tank, 34-Fenton neutralization tank, 35-Fenton degassing tank, 36-Fenton flocculation tank, 37-Fenton sedimentation tank, 38-reflux pipe, 39-tension return spring, 40-groove, 41-corresponding groove. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various configurations. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention. In the embodiments, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application.

[0045] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be an electrical connection; it can be a hydraulic oil circuit connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] See also Figure 1 As shown, a nitrification wastewater treatment device includes an anaerobic treatment system 1, an aerobic treatment system 2 and a Fenton reaction system 3. The aerobic treatment system 2 is located between the anaerobic treatment system 1 and the Fenton reaction system 3. The nitrification wastewater is treated in sequence by the anaerobic treatment system 1, the aerobic treatment system 2 and the Fenton reaction system 3, and finally can meet the national emission standards.

[0048] The anaerobic treatment system 1 includes a PEIC anaerobic reaction tower 4, one end of the PEIC anaerobic reaction tower 4 is connected to a water distribution tank 5, and the other end is connected to a sedimentation tank 7, and a water pump 6 is connected between the water distribution tank 5 and the PEIC anaerobic reactor; the water distribution tank 5 has a height of 5m and a diameter of 2m, and is filled with water, and a heating system is also provided inside the water distribution tank 5, and the heating system can heat the water inside the water distribution tank 5 into hot steam, and a wastewater inlet pipe passes through the water distribution tank 5, and the wastewater inlet pipe is spirally coiled inside the water distribution tank 5, and the hot steam inside the water distribution tank 5 heats the wastewater temperature, and a sewage discharge channel is also provided on the sedimentation tank 7, and the sewage discharge channel is normally closed and can be opened when needed, and the PEIC anaerobic tower includes using an existing anaerobic tower;

[0049] Since the biogas content after anaerobic treatment is low and the hydrogen sulfide concentration is low, the biogas needs to be discharged into the dry desulfurization tower 8 for dry desulfurization before being used. In order to ensure the desulfurization effect, a condensation water tank 9 should be set before the biogas enters the dry desulfurization tower 8 to ensure the humidity of the biogas and prevent flashback. The biogas after dry desulfurization is separated and concentrated from other gas components through physical separation. The concentrated biogas can be used for boiler combustion or emergency fire cabinet combustion.

[0050] The nitrified wastewater after preliminary treatment in the anaerobic system is then discharged into the aerobic treatment system 2, where the organic matter in the wastewater is further decomposed into carbon dioxide and water under the action of aerobic bacteria.

[0051] The aerobic treatment system 2 includes an aerobic tank 10 and a secondary sedimentation tank 11. The aerobic tank 10 is located between the sedimentation tank 7 and the secondary sedimentation tank 11. The specification of the aerobic tank 10 is 900m 3 The aeration system is installed at the bottom of the aerobic pool 10. The aeration system includes an aeration head. The aeration head is connected to an aerator through an aeration pipe. The aerator presses air or oxygen from the pipe into the aeration head, thereby mixing oxygen into the sewage. A stirring system is installed in the aerobic pool 10 to make the reaction faster. The aerobic pool 10 is provided with an inlet and an outlet. Both the inlet and the outlet are provided with electric valves. The nitrification wastewater enters the aerobic pool 10 from the inlet and is discharged into the secondary sedimentation tank 11 from the outlet after being treated. The mixed liquor is separated into mud and water in the secondary sedimentation tank 11 to separate the activated sludge and the supernatant. The secondary sedimentation tank 11 is connected with a return pipe, which leads from the secondary sedimentation tank 11 to the aerobic tank 10. The activated sludge in the secondary sedimentation tank 11 can be returned to the aerobic tank 10 through the return pipe, thereby maintaining the concentration and biomass of the sludge in the aerobic tank 10. In order to better detect and control the operating status of the aerobic tank 10, detection equipment such as a dissolved oxygen detector, a pH meter and a flow meter are also provided in the tank body.

[0052] In addition, the sludge produced in the aerobic tank 10 needs to be regularly returned to the anaerobic tank for denitrification. The sludge return system includes a return pipe 38, which connects the centrifugal pump and the aerobic tank 10. An electric valve is provided on the return pipe to automatically control the return amount.

[0053] In the above-mentioned aerobic treatment system 2, a return pipe 38 is connected between the secondary sedimentation tank 11 and the aerobic tank 10, and a return pipe 38 is also connected between the aerobic tank 10 and the PEIC anaerobic tank. Since the medium returning in the return pipe 38 is sludge, the return pipe 38 is prone to blockage. Therefore, when setting, the heights of the PEIC anaerobic tank, the aerobic tank 10 and the secondary sedimentation tank 11 are successively increased. At this time, it is convenient to set the return pipe 38 to an inclined state. Since the two ends of the return pipe 38 are not on the same horizontal line, under the influence of gravity, it is conducive to the flow of sludge.

[0054] See also Figures 2 to 7 As shown, in addition, a dredging device is also provided on the return pipe 38. When the return pipe is blocked, the return pipe 38 is cleaned and dredged. The dredging device includes a blocking component and a dredging component. The blocking component includes a blocking strip and a clamping plate 12. There are two clamping plates 12. The two clamping plates 12 are parallel to each other. The blocking strip is located between the two clamping plates 12. A strip-shaped notch 13 is provided on the return pipe 38. In the initial state, the blocking strip blocks the strip-shaped notch 13. A fixing component is vertically connected to the outer wall of the pipe. The clamping plate 12 is slidably connected to the fixing component. When the clamping plate 12 is separated from the outer wall of the return pipe 38, the blocking strip is moved out from the notch. The dredging component can dredge the sludge in the pipe.

[0055] The fixing assembly includes two fixing rods 14 groups, each fixing rod 14 group includes two fixing rods 14, and a limiting rod 15 is fixedly connected between the upper ends of the two fixing rods 14. The extension direction of the two limiting rods 15 is perpendicular to the length direction of the notch. A track groove extending along the length direction is provided on the fixing rod 14, and a protrusion that fits in the track groove is provided on the clamping plate 12. At this time, the clamping plate 12 and the fixing rod 14 group form a sliding connection, so that the clamping plate 12 can slide along the length direction of the fixing rod 14, and the limiting rod 15 can prevent the clamping plate 12 from sliding out of the fixing rod 14. The two clamping plates 12 The sealing strip between the two clamps 12 can be divided into a fixed block 16 and a movable block 17. There are two movable blocks 17. The fixed block 16 is located between the two movable blocks 17. The fixed block 16 is fixedly connected to the two clamps 12. The two movable blocks 17 are slidably connected to the clamps 12. Specifically, each clamp 12 is provided with a slide groove 18, which extends in the horizontal direction. The slide grooves 18 on the two clamps 12 are at the same horizontal height. The two movable blocks 17 are provided with a convex strip 19, which is coupled with the slide groove 18. In the initial position, the three sliders are in close contact to just block the return pipe 38.

[0056] The return pipe 38 is fixedly connected with an oblique support arm 20, the blocking strip is located between the two oblique support arms 20, the upper ends of the two oblique support arms 20 are fixedly connected with a fixed pulley 21, and two pull ropes 22 are connected between the two clamping plates 12. The two pull ropes 22 are respectively located near the two ends of the clamping plates 12. A lifting ring 23 is fixed in the middle of each pull rope 22, and a connecting rope 24 is connected to the lifting ring 23. The pull ring is located directly below the fixed pulley 21, and the two connecting ropes 24 are respectively passed around the fixed pulley on the same side. The wheel 21 is fixedly connected to the dredging assembly. When the dredging assembly moves vertically, it can drive the blocking assembly to move vertically. The dredging assembly includes a transverse plate 25. Two dredging arms 26 are fixedly connected to the lower surface of the transverse plate 25. The dredging arms 26 extend downward. The distance between the two dredging arms 26 is greater than the length of the fixed block 16. The transverse plate 25 is pressed downward. The connecting rope 24 exerts an upward pulling force on the clamping plate 12. The fixed block 16 moves upward with the clamping plate 12, and the two moving blocks 17 also move upward with the clamping plate 12.

[0057] The upper surfaces of the two moving blocks 17 are fixedly connected with arc-shaped guide plates 27. The extension directions of the two guide plates 27 are opposite, and the guide plates 27 extend in the direction away from the fixed block 16. The lower ends of the guide plates 27 are fixedly connected to the moving blocks 17. When the clamping plate 12 rises, the two moving blocks 17 rise together. When they rise to a certain height, the two guide plates 27 contact the corresponding limit rods 15 respectively. The two moving blocks 17 move in the direction away from the fixed block 16 under the cooperation of the guide plates 27 and the limit rods 15. A certain gap appears between the two moving blocks 17 and the fixed block 16. When the moving blocks 17 move in the direction away from the fixed block 16, the two dredging arms 26 on the cross plate 25 pass through the gap. The up and down sliding cross plate 25 can drive the dredging arms 26 to move up and down, thereby dredging the sludge in the return pipe 38.

[0058] Two vertical plates 28 are also fixedly connected between the two clamping plates 12. The blocking strip is located between the two vertical plates 28. A compression return spring 29 is provided on the end face of each vertical plate 28. The compression return spring 29 is located between the vertical plate 28 and the moving block 17. When the blocking strip just blocks the notch, the compression return spring 29 contacts the end of the moving block 17 and has a certain deformation. At this time, the compression return spring 29 has a certain restoring force. When the two moving blocks 17 move in a direction away from the fixed block 16 under the cooperation of the guide plate 27 and the limit rod 15, the compression return spring 29 is compressed by pressure. When the cross plate 25 is lifted upward, the fixed block 16 falls under the action of gravity, and the two moving blocks 17 are restored to a state of close contact with the fixed block 16 under the action of the restoring force of the compression return spring 29.

[0059] See also Figure 4As shown, in order to prevent the slider from being pushed out of the notch due to excessive pressure of sludge in the return pipe 38, a locking assembly is provided on the clamp 12. Specifically, threaded holes are provided on the four vertical rods. When the sealing strip is located in the notch, the threaded rod 30 is screwed into the threaded hole to lock the sealing strip. In addition, in order to better dredge the pipeline, multiple notches and dredging assemblies can be provided on the pipeline.

[0060] See also Figure 8 As shown, the nitrification wastewater after being treated by the aerobic treatment system 2 is discharged into the Fenton reaction system 3 for further purification. The Fenton reaction system 3 includes a pH adjustment tank 31 and a reaction tank. The pH adjustment tank 31 and the reaction tank are usually made of stainless steel or alumina ceramics, have good corrosion resistance and strength, and can withstand harsh environments such as high temperature and high pressure. There are two reaction tanks, namely the first Fenton reaction tank 32 and the second Fenton reaction tank 33. The pH adjustment tank 31, the first Fenton reaction tank 32 and the second Fenton reaction tank 33 are connected in sequence. The second Fenton reaction tank is connected to a subsequent treatment system. The subsequent treatment system includes a Fenton neutralization tank 34, a Fenton degassing tank 35, a Fenton flocculation tank 36 and a Fenton sedimentation tank 37. The Fenton neutralization tank 34, the Fenton degassing tank 35, the Fenton flocculation tank 36 and the Fenton sedimentation tank 37 are connected in sequence.

[0061] See also Figure 1 As shown, when the above-mentioned nitrification sewage treatment device is working, the sewage passes through the anaerobic treatment system 1, the aerobic treatment system 2 and the Fenton reaction system 3 in sequence. The wastewater first passes through the water distribution tank 5 in the anaerobic treatment system 1, and the hot steam in the water distribution tank 5 heats the wastewater temperature to meet the anaerobic water inlet conditions, that is, the wastewater is heated to 35±3°C; the wastewater heated by the water distribution tank 5 enters the PEIC anaerobic reaction tower 4 through the water pump 6, and the organic matter in the wastewater is decomposed into small molecular organic matter and biogas under the action of anaerobic bacteria in the anaerobic reaction tower; after anaerobic treatment, the wastewater will contain a large amount of suspended matter and sediment. At this time, the nitrification wastewater after anaerobic treatment is discharged into the sedimentation tank 7, and these substances will gradually settle to the bottom of the sedimentation tank 7 to form sludge or sediment, so that the wastewater is preliminarily purified;

[0062] The nitrified wastewater after the preliminary treatment by the anaerobic system is then discharged into the aerobic treatment system 2 for further purification. First, the wastewater enters the aerobic tank 10 from the inlet on the aerobic tank 10. The aerobic bacteria further purify the nitrified wastewater that has been initially purified by the anaerobic treatment system 1, and decompose it into carbon dioxide and water. The mixed liquid enters the secondary sedimentation tank 11 from the outlet on the aerobic tank 10. The mixed liquid is separated into mud and water in the secondary sedimentation tank 11, and the activated sludge and the supernatant are separated. The activated sludge can be returned to the aerobic tank 10 through the return pipe, so as to maintain the concentration and biomass of the sludge in the aerobic tank 10. The supernatant separated in the secondary tank enters the Fenton treatment system from the secondary sedimentation tank 11;

[0063] First, the pH value of the supernatant is adjusted to acidic with an acid solution, usually to between 3.0 and 4.0, and the supernatant after the pH adjustment is introduced into the first Fenton reaction tank 32, ferrous sulfate is added and mixed evenly, and then the supernatant flows to the second Fenton reaction tank 33, hydrogen peroxide is added, and a Fenton catalytic oxidation reaction is performed; the wastewater after the oxidation reaction flows into the Fenton neutralization tank 34, alkali solution is added for neutralization reaction, and the pH value of the wastewater is adjusted to neutrality so that the pH value of the wastewater meets the effluent standard; the wastewater after the neutralization reaction flows into the Fenton degassing tank 35 to remove bubbles in the wastewater; the wastewater after the degassing reaction flows to the Fenton flocculation tank 36, a flocculant is added and stirred, so that the flocculation reaction is fully carried out, and the iron mud in the wastewater is flocculated; finally, the wastewater after the flocculation reaction flows into the Fenton sedimentation tank 37 to precipitate the iron mud therein.

[0064] See also Fig. 9 and Fig.10 As shown, as another embodiment of the present invention, the reset structure of the moving block 17 is improved, specifically as follows:

[0065] Two grooves 40 are arranged on the upper surface of the fixed block 16, and the two grooves 40 are symmetrically distributed about the central axis of the fixed block 16. A corresponding groove 41 is arranged on the upper surface of the moving block 17 close to the fixed block 16. The length and depth of the groove 40 and the corresponding groove 41 are the same. A tension reset spring 39 is connected between the fixed block 16 and the moving block 17. One end of the tension reset spring 39 is fixedly connected in the groove 40, and the other end is fixedly connected in the corresponding groove 41 on the moving block 17. The diameter of the tension reset spring 39 is smaller than the depth of the groove 40 and the corresponding groove 41. In the initial state When the blocking strip blocks the strip-shaped notch 13 and the fixed block 16 and the movable block 17 are in close contact, the stretching reset spring 39 is in a natural state, pressing the cross plate 25 downward, and the connecting rope 24 exerts an upward pulling force on the clamping plate 12. The fixed block 16 moves upward with the clamping plate 12, and the two movable blocks 17 also move upward with the clamping plate 12. The two movable blocks 17 move in a direction away from the fixed block 16 under the cooperation of the guide plate 27 and the limit rod 15. A certain gap appears between the two movable blocks 17 and the fixed block 16. At this time, the stretching reset spring is in a stretched state.

[0066] The two dredging arms 26 on the horizontal plate 25 pass through the gap between the fixed block and the movable block. The horizontal plate 25 can be slid up and down to drive the dredging arms 26 to move up and down, thereby dredging the sludge in the return pipe 38. When the horizontal plate 25 is lifted upward, the fixed block 16 falls down under the action of gravity, and the two movable blocks 17 are restored to a state of close contact with the fixed block 16 under the action of the restoring force of the stretching restoring spring 29.

[0067] In this embodiment, there is no need to set up a vertical plate and a first compression return spring, and the movable block 17 can be restored to a state of close contact with the fixed block 16 by relying solely on the return force of the tension return spring 39. However, in this embodiment, since the tension return spring 39 is located below the dredging arm 26, the tension return spring 39 has a certain obstructive effect on the dredging arm 26 when the dredging arm 26 dredges the sludge in the return pipe 38. Therefore, the dredging arm 26 is configured to have a "Y"-shaped structure, with the opening of the dredging arm 26 facing downward and the dredging arm 26 spanning over the tension return spring 39.

[0068] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A nitrification wastewater treatment device, comprising an aerobic treatment system, the aerobic treatment system being connected to an anaerobic treatment system and a Fenton treatment system, characterized in that: The nitrification wastewater is treated in sequence by an anaerobic treatment system, an aerobic treatment system and a Fenton treatment system; The aerobic treatment system comprises an aerobic tank and a secondary sedimentation tank, and a reflux pipeline is connected between the aerobic tank and the secondary sedimentation tank; A return pipe is also connected between the aerobic tank and the anaerobic treatment system; The reflux pipe is provided with a strip notch and an oblique support arm, there are two oblique support arms, the strip notch is located between the two oblique support arms, the upper end of the oblique support arm is connected with a fixed pulley, and a dredging device is provided at the strip notch, and the dredging device cleans and dredges the reflux pipe; The dredging device comprises a blocking component and a dredging component, wherein the blocking component and the dredging component are connected via a connecting rope, the fixed pulley supports the connecting rope, and the dredging component drives the blocking component to move when the dredging component moves; The blocking assembly includes a blocking strip and a clamping plate. The blocking strip blocks the strip-shaped notch. There are two clamping plates, which are arranged in parallel. The blocking strip is located between the two clamping plates, and the clamping plates are connected to the lower end of the connecting rope. The anaerobic treatment system comprises a water distribution tank and an anaerobic settling tank, and a PEIC anaerobic reaction tower is connected between the water distribution tank and the anaerobic settling tank; The Fenton treatment system comprises a pH adjustment tank, a first Fenton reaction tank, a second Fenton reaction tank and a subsequent treatment system, wherein the pH adjustment tank, the first Fenton reaction tank, the second Fenton reaction tank and the subsequent treatment system are connected in sequence, and the subsequent treatment system comprises a Fenton neutralization tank, a Fenton degassing tank, a Fenton flocculation tank and a Fenton sedimentation tank, wherein the Fenton neutralization tank, the Fenton degassing tank, the Fenton flocculation tank and the Fenton sedimentation tank are also connected in sequence.

2. A nitrification wastewater treatment device according to claim 1, characterized in that: The blocking strip comprises a fixed block and a moving block, there are two moving blocks, the fixed block is located between the two moving blocks, the fixed block is fixedly connected to the clamping plate, and the moving block is slidably connected to the clamping plate.

3. A nitrification wastewater treatment device according to claim 2, characterized in that: An arc-shaped guide plate is arranged on the upper surface of the moving block, and the guide plate extends in a direction away from the fixed block.

4. A nitrification wastewater treatment device according to claim 3, characterized in that: The clamping plate is connected to a fixed rod group fixed on the reflux pipe, and the fixed rod group includes two fixed rods. A limiting rod is connected between the upper ends of the two fixed rods. When the clearing assembly drives the blocking assembly to move upward until the guide plate contacts the limiting rod, the moving block moves in a direction away from the fixed block.

5. A nitrification wastewater treatment device according to claim 4, characterized in that: A vertical plate is fixed on the clamping plate, and the vertical plate is located between the two clamping plates. A spring is arranged on the end surface of each vertical plate, and the spring is located between the vertical plate and the moving block.

6. A nitrification wastewater treatment device according to claim 4, characterized in that: The dredging component comprises a transverse plate, two dredging arms are fixedly connected to the lower surface of the transverse plate, and the transverse plate is connected to the upper end of the connecting rope.

7. A method for treating nitrification wastewater using the nitrification wastewater treatment device according to any one of claims 1 to 6, characterized in that: The steps include: S1: Nitrification wastewater is heated in the water distribution tank to meet the anaerobic water inlet conditions, and the temperature at this time is 35±3℃; S2: Nitrification wastewater that meets the anaerobic water inlet conditions is introduced into the PEIC anaerobic reaction tower, and the organic matter in the wastewater is decomposed into small molecular organic matter and biogas under the action of anaerobic bacteria; S3: passing the wastewater into the sedimentation tank to precipitate the sediment in the wastewater; S4: passing the wastewater into the aerobic pool, where aerobic bacteria further purify the wastewater and decompose it into carbon dioxide and water; S5: passing the wastewater after the aerobic tank treatment into the secondary sedimentation tank, wherein the secondary sedimentation tank separates the mixed liquid into mud and water, and separates the activated sludge and the supernatant; S6: passing the supernatant into the pH adjustment tank, and adjusting the pH value of the supernatant to between 3.0 and 4.0 using sulfuric acid; S7: introducing the pH-adjusted supernatant into the first Fenton reaction tank, adding ferrous sulfate and mixing evenly; S8: passing the supernatant into the second Fenton reaction tank, adding hydrogen peroxide, and performing Fenton catalytic oxidation reaction; S9: The wastewater after the oxidation reaction flows into the Fenton neutralization tank, and alkali solution is added to carry out a neutralization reaction, and the pH value of the wastewater is adjusted to neutrality so that the pH value of the wastewater meets the effluent standard; S10: The wastewater after the neutralization reaction enters the Fenton degassing tank to remove bubbles in the wastewater; S11: the wastewater after the degassing reaction is flowed to the Fenton flocculation tank by gravity, and a flocculant is added and stirred to make the flocculation reaction fully proceed, so that the iron sludge in the wastewater is flocculated; S12: Finally, the wastewater after flocculation reaction flows into the Fenton sedimentation tank to precipitate the iron sludge therein.

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