Multifunctional device and method for treating nylon wastewater by efficient catalytic oxidation-biological coupling

Abstract

The embodiment of the invention provides a multifunctional device and method for treating nylon wastewater through efficient catalytic oxidation-biological coupling, and relates to the technical field of wastewater treatment. The multifunctional efficient catalytic oxidation-biological coupling nylon wastewater treatment device comprises a catalytic oxidation tower, one inlet of the catalytic oxidation tower is communicated with a cooling water pump, the other inlet of the catalytic oxidation tower is communicated with a cooling tower which is in reflux communication with the cooling water pump, and a plurality of groups of electrooxidation electrode plates are embedded in the catalytic oxidation tower. The plurality of groups of electro-oxidation electrode plates are formed by circumferentially staggering electro-oxidation anode plates and electro-oxidation cathode plates and are used for realizing comprehensive electro-oxidation reaction treatment on wastewater, and a micropore diffusion type filtering spray head is embedded in the top of the catalytic oxidation tower. According to the scheme provided by the invention, wastewater and granular sludge are fully absorbed and reacted in a manner of combining high-efficiency turbulent flow, rotational flow aeration and rotational jet flow, and a high-efficiency denitrification-nitration reaction effect is achieved, so that the treatment effect of nylon wastewater is enhanced, and the treatment efficiency of the nylon wastewater is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wastewater treatment, and particularly relates to a multifunctional efficient catalytic oxidation-biological coupling nylon wastewater treatment device and method. BACKGROUND

[0002] The main raw materials of nylon include dibasic acid (such as adipic acid) and dibasic amine (such as hexamethylene diamine), which form nylon polymers through polycondensation reaction. The development of the nylon chemical industry not only promotes the progress of the related industrial chain, but also poses new challenges to environmental protection and resource utilization. The characteristics of nylon chemical wastewater can be summarized as follows: High concentration of organic matter: the wastewater contains a large amount of unreacted raw materials and additives, resulting in high concentration of organic matter, COD higher than 5000 mg / L, and ammonia nitrogen higher than 500 mg / L; complex composition: the wastewater contains a variety of chemical substances, making the treatment difficult; poor biodegradability: due to the presence of a large amount of substances that are difficult to biodegrade in the wastewater, the macromolecular structures of benzene series (such as hexamethylene diamine) and oligomers are stable, and conventional microorganisms are difficult to decompose, resulting in poor biodegradability of the wastewater; high toxicity: cyanide (0.5-2 mg / L) and benzene derivatives interfere with microbial metabolism, and some pollutants have potential harm to aquatic organisms and human health.

[0003] In the prior art (patent application with the patent name of an electro-catalytic oxidation-biological coupling wastewater treatment system and the announcement number of CN217051962U), electro-catalytic oxidation is combined with biological aeration filter, which helps to improve the treatment effect of wastewater and reduce the cost of wastewater treatment. In the process of implementing the technical solution, it is found that at least the following problems exist in the prior art: In the prior art, hydrolysis acidification + AO + MBR + advanced treatment are mainly used. This process has the following problems: the effective carbon source is insufficient, the B / C ratio is less than 0.2, additional carbon source needs to be added, the cost increases by more than 30%; the consumption of chemicals is large, a large amount of liquid alkali, PAC and sodium hypochlorite need to be added, the cost is high, the wastewater and granular sludge cannot be fully absorbed and reacted in the way of combining high-efficiency turbulence, rotational flow aeration and rotational jet flow, and the nitrification reaction effect is not efficient, resulting in poor treatment effect of nylon wastewater. SUMMARY

[0004] The present application aims to at least solve the technical problem that the wastewater and granular sludge cannot be fully absorbed and reacted in the way of combining high-efficiency turbulence, rotational flow aeration and rotational jet flow, and the nitrification reaction effect is not efficient, resulting in poor treatment effect of nylon wastewater in the prior art. To this end, the present application proposes a multifunctional efficient catalytic oxidation-biological coupling nylon wastewater treatment device and method.

[0005] To achieve the above-mentioned purpose, the specific technical solutions of the present application are as follows: The device for treating nylon wastewater by multifunctional high-efficiency catalytic oxidation-biological coupling treatment comprises a catalytic oxidation tower, one inlet of the catalytic oxidation tower is communicated with a cooling water pump, and the other inlet of the catalytic oxidation tower is communicated with a cooling tower communicated with the cooling water pump in reflux; The outlet of the catalytic oxidation tower is communicated with an expanded granular sludge tank, a submersible mixer for mixing granular sludge is arranged in the expanded granular sludge tank, the outlet of the expanded granular sludge tank is communicated with a primary sludge reflux pump, and an embedded box is embedded near the granular sludge area of the expanded granular sludge tank; The outlet of the primary sludge reflux pump is communicated with a nitrification tank, one outlet of the nitrification tank is communicated with a secondary sedimentation tank, the outlet at the bottom of the nitrification tank is communicated with the secondary sedimentation tank through a secondary sludge reflux pump, and a central transmission mud scraper is rotatably arranged in the middle of the secondary sedimentation tank; The periphery of the expanded granular sludge tank near the embedded box is provided with a turbulence assembly for fully contacting the granular sludge and wastewater, the turbulence assembly comprises a double-head motor fixed on the back of the nitrification tank, and a jet assembly and a uniform flow assembly for wastewater nitrification reaction are arranged in the nitrification tank, respectively; The catalytic oxidation tower: first, the wastewater of the external adjusting tank is lifted to the catalytic oxidation tower by a pump, the wastewater is firstly subjected to primary oxidation by a plurality of groups of electric oxidation in the tower, the anode of the electric oxidation adopts a titanium-based electrode plate, the cathode adopts a graphene electrode plate, the current density is 10-50 mA / cm2, the reaction time is 30-120 min, a large number of dense bubbles are generated after oxidation, the wastewater is sprayed through the upper microporous diffusion type filter nozzle, the nozzle diameter is 100 mm, the small hole diameter is 5 mm, the bubbles in the wastewater can be removed, at the same time, a large amount of heat is generated by the plurality of groups of electric oxidation, the wastewater temperature is increased, the cooling tower is connected at the water inlet end and the water outlet end of the plurality of groups of electric oxidation, so that the wastewater temperature after electric oxidation is ensured to be lower than 40℃. The wastewater after removing the bubbles continues to move to the top of the tower, ozone generated by an ozone generator is introduced into the upper part of the tower, the ozone dosage is 25-60 mg / L, the ozone pipeline adopts a multi-edge opening to contact with the wastewater, which can improve the ozone utilization rate by 30%, the ozone and the filler layer form catalytic oxidation, the filler layer is obtained by completely mixing active carbon, ceramic particles and Fe2O3 in a proportion of about 6:3:1, the catalytic time is 30-120 min, the wastewater is subjected to secondary oxidation, the excess ozone is separated from the wastewater at the top of the tower through a steam-water separator, the separated ozone is treated by a tower top outlet intelligent control instrument and an ozone destroyer and then discharged into the atmosphere, and the separated wastewater flows into the expanded granular sludge tank from the bottom; The expanded granular sludge tank: one fifth of the volume of the tank is filled with granular sludge, the pH is controlled at 6.5-7.5, the temperature is 30-35℃, the granular particle size is 0.5-3 mm, the intelligent control instruments pH meter, ORP meter and TT meter are arranged, the granular sludge has fast starting speed, fast settling speed and less sludge loss, and the inner and outer layer layered structure can realize simultaneous nitrification and denitrification; Nitration tank: the sludge in the nitration tank is conventional flocculation aerobic activated sludge, the tank is provided with a jet aerator, the temperature in the tank is 30-35℃, the pH is controlled at 7.5-8.5, the dissolved oxygen is controlled at 2-3mg / L, and intelligent control instruments pH meter, DO meter, TT meter and electric regulating valve are provided, based on the "feedforward + model + feedback" mode, the fan air volume is dynamically adjusted to reduce the aeration energy consumption by 30%; Secondary sedimentation tank: a vertical flow type sedimentation tank is used, the surface load is 0.6-1.5 m³ / (m²·h), the retention time is 1.5-2.5h, the sludge scraper is a central transmission sludge scraper, the peripheral linear speed is 2m / min, and a sludge return pump and sludge discharge are provided.

[0006] Preferably: a plurality of electric oxidation electrode plates are embedded in the catalytic oxidation tower, and the plurality of electric oxidation electrode plates are composed of circumferentially staggered electric oxidation anode plates and electric oxidation cathode plates.

[0007] Preferably: a microporous diffusion type filter nozzle is embedded at the top of the catalytic oxidation tower and is distributed in an array, and a multi-edge open ozone pipe is connected above the microporous diffusion type filter nozzle.

[0008] Preferably: a packing layer is filled above the multi-edge open ozone pipe close to the catalytic oxidation tower, and a steam-water separator is arranged above the packing layer.

[0009] Preferably: the turbulence assembly further comprises a main synchronous wheel fixed on one output shaft of the double-head motor, a slave synchronous wheel driven by a synchronous belt, a vertical gear rack fixed in the slave synchronous wheel, a horizontal gear rack meshing with the expansion granular sludge tank and the embedded box at the bottom of the vertical gear rack, a planet gear meshing with the outer side of the horizontal gear rack, and a turbulence rack for sufficient contact between the granular sludge and the wastewater fixed on the outer side of the planet gear.

[0010] Preferably: the jet assembly comprises an aeration pump arranged on the nitration tank, a rotating end connected to one outlet of the aeration pump, a communication end connected in the rotating end and kept in mutual communication with each other, a jet pipe connected at the bottom end of the communication end and rotatingly matched with the bottom of the nitration tank, a jet aerator for wastewater nitration reaction connected to the bottom end of the jet pipe, a small synchronous wheel sleeved on the outer end of the jet pipe close to the communication end, and a large synchronous wheel fixedly matched with the other output shaft of the double-head motor driven by a synchronous belt.

[0011] Preferably: the uniform flow assembly comprises a reciprocating screw rod tooth sleeved on the outer end of the jet pipe, a screw rod sleeve threadedly connected on the reciprocating screw rod tooth, an annular framework sleeved on the outer side of the screw rod sleeve, a uniform flow net circumferentially embedded in the annular framework, and a convex slide head fixed on the outer circumference of the annular framework, and the nitration tank is circumferentially provided with a concave slide groove slidingly matched with the convex slide head for stable lifting of the annular framework.

[0012] Preferably, the planetary gear is meshed with an upper differential gear at its top, and the top of the upper differential gear is fitted with a turbulence vane for turbulent flow of wastewater above the expanded granular sludge tank.

[0013] Preferably, the bottom of the planetary gear is engaged with a lower differential gear, and the bottom of the lower differential gear is fixed with a turbulence rod for further turbulence and mixing of granular sludge and wastewater below the expanded granular sludge tank.

[0014] On the other hand, this solution also provides a multifunctional and efficient catalytic oxidation-biological coupling method for treating nylon wastewater, including the following steps: Step 1: First, connect the wastewater from the external equalization tank to the inlet of the catalytic oxidation tower via a pump and pipeline. Then, connect the positive and negative power supplies to the electro-oxidation anode and cathode plates of the multiple electro-oxidation electrode plates, and adjust the electro-oxidation current density to the predetermined value. Check the electro-oxidation reaction between the multiple electro-oxidation electrode plates and the wastewater through the observation port. Reduce the heat generated during the electro-oxidation reaction by the multiple electro-oxidation electrode plates using a cooling water pump and an external cooling tower, keeping the wastewater temperature below 40℃. Simultaneously, when a large number of dense bubbles are generated during the electro-oxidation process, the wastewater is separated from the bubbles by a microporous diffusion filter nozzle. This completes the first oxidation step for the wastewater. Step 2: The wastewater continues to flow towards the top of the catalytic oxidation tower. At the top of the tower is an ozone inlet, which is connected to an ozone generator via a multi-perforated ozone pipe. An ORP meter and a COD meter are externally connected to the multi-perforated ozone pipe, allowing for dynamic and intelligent control of the reaction process. After ozone is introduced into the catalytic oxidation tower through the multi-perforated ozone pipe, the contact area between the ozone and the wastewater is increased. A packing layer is placed above the multi-perforated ozone pipe to achieve the catalytic oxidation effect of ozone on the wastewater at the top of the tower, completing the second oxidation of the wastewater. Step 3: Excess ozone at the top of the catalytic oxidation tower is separated from the wastewater by a gas-water separator. The separated ozone is discharged into the atmosphere after being treated by an external intelligent control instrument and an ozone destroyer through the top outlet of the catalytic oxidation tower. The separated wastewater flows by gravity from the outlet on the top side wall of the catalytic oxidation tower to the bottom inlet of the expanded granular sludge tank through a pipe. After two efficient oxidation processes, the large molecular organic matter and toxic and harmful substances in the wastewater are decomposed, further improving the biodegradability of the wastewater. Step 4: First, add one-fifth of the volume of granular sludge to the expanded granular sludge tank. Then, use intelligent control instruments such as pH meter, ORP meter, and TT meter connected to the outside of the expanded granular sludge tank to monitor the reaction between the granular sludge and wastewater in real time. A submersible mixer is installed near the granular sludge area of ​​the expanded granular sludge tank. The expanded granular sludge tank is connected to the upper inlet of the nitrification tank through a pipeline. The nitrification tank is equipped with intelligent control instruments such as pH meter, DO meter, TT meter, and electric regulating valve. Based on the "feedforward + model + feedback" mode, the fan air volume is dynamically adjusted to promote the nitrification reaction process of the wastewater. Step 5: During this period, first control the dual-head motor to start and drive the main synchronous pulley to rotate linearly. The main synchronous pulley drives the vertical gear carrier on the synchronous pulley to rotate accordingly through the synchronous belt. The vertical gear carrier drives multiple sets of planetary gears on the horizontal gear carrier to rotate linearly in the inner box. Then, the multiple sets of planetary gears drive the baffle to fully contact and turbulently treat the granular sludge and wastewater in the expanded granular sludge tank. At the same time, the planetary gears drive the upper differential gear and the lower differential gear to rotate linearly. The upper differential gear drives the baffle blades to turbulently treat the wastewater in the middle of the expanded granular sludge tank, and the lower differential gear drives the baffle rod to further turbulently treat the granular sludge and wastewater in the expanded granular sludge tank, so that the granular sludge and wastewater can fully react. Step Six: A return port is provided at the bottom of the nitrification tank. The return port is connected to the inlet of the primary sludge return pump through a pipe, and the outlet of the primary sludge return pump is connected to the return port of the expanded granular sludge tank through a pipe, realizing the nitrification-denitrification process of wastewater. During this period, the aeration pump in the open state supplies the pressurized air source generated by the pump into the jet pipe through the rotating end and the connecting end that are in a rotating and interconnected state. Then, the jet aerator sprays and releases the pressurized air source to the bottom of the nitrification tank, promoting the uniform nitrification reaction of the wastewater in the nitrification tank. At the same time, the dual-head motor also drives the large synchronous pulley to rotate linearly. The large synchronous pulley drives the jet pipe on the small synchronous pulley to rotate through the synchronous belt. Then, the jet pipe drives the jet aerator to spray and release the pressurized air source in a swirling manner, further improving the uniformity of the nitrification reaction of the wastewater in the nitrification tank. At the same time, the linearly rotating jet tube drives the reciprocating screw teeth to rotate synchronously. The reciprocating screw teeth drive the screw sleeve to move up and down repeatedly. With the sliding limit cooperation of the convex slide head and concave slide groove on the annular skeleton, the screw sleeve drives the flow equalization net on the annular skeleton to move up and down repeatedly in the middle area of ​​the nitrification tank, thereby equalizing the flow of wastewater in the middle area of ​​the nitrification tank and making it more uniform and sufficient for nitrification reaction. Step 7: The nitrification tank is equipped with an outlet at the top, which is connected to the inlet of the secondary sedimentation tank through a pipe. The inlet of the secondary sedimentation tank transports wastewater to the guide tube of the central drive sludge scraper through a pipe. The wastewater diffuses from the guide tube to the surrounding areas and is discharged from the system through the surrounding weirs after treatment. The bottom of the secondary tank is equipped with a sludge hopper. The central drive sludge scraper collects the sludge at the bottom of the tank into the sludge hopper. The bottom of the sludge hopper is connected to the inlet of the secondary sludge return pump through a pipe to realize the functions of sludge discharge and sludge return.

[0015] The multifunctional and efficient catalytic oxidation-biological coupling treatment device for nylon wastewater of the present invention has the following advantages: 1. This multifunctional and efficient catalytic oxidation-biological coupling treatment device for nylon wastewater first uses a dual-head motor to drive the vertical gear frame on the main synchronous pulley to rotate linearly via the synchronous belt on the main synchronous pulley. The vertical gear frame drives the turbulence frame on multiple sets of planetary gears to rotate accordingly via the horizontal gear frame. This effectively turbulents the granular sludge and wastewater in the expanded granular sludge tank, causing them to fully dissipate and fully absorb the solid particles in the wastewater, thus realizing the nitrification reaction of the wastewater.

[0016] 2. This multifunctional and efficient catalytic oxidation-biological coupling treatment device for nylon wastewater first supplies pressurized air generated by the aeration pump into the jet pipe through the rotating end and the connecting end that are in a state of mutual rotation. Then, the jet pipe supplies the pressurized air to the jet aerator. At the same time, the dual-head motor drives the jet pipe on the small synchronous pulley to rotate linearly through the synchronous belt on the large synchronous pulley. The pressurized air in the jet aerator is released into the nitrification tank in a swirling jet manner, which further improves the nitrification reaction of the wastewater in the nitrification tank. 3. This multifunctional and efficient catalytic oxidation-biological coupling treatment device for nylon wastewater, simultaneously, with the sliding limit cooperation of the convex sliding head and concave sliding groove on the annular skeleton, the linearly rotating reciprocating screw teeth drive the annular skeleton to reciprocate up and down through the screw sleeve. Subsequently, the annular skeleton drives the circumferentially distributed flow equalization net to reciprocate up and down in the central area of ​​the nitrification tank, to perform flow equalization treatment on the wastewater in the central area of ​​the nitrification tank, so that the nitrification reaction occurs evenly and fully, further improving the nitrification reaction rate of the wastewater. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the multifunctional and efficient catalytic oxidation-biological coupling treatment device and method for nylon wastewater of the present invention; Figure 2 This is a front cross-sectional view of the multi-group electro-oxidation electrode plate structure of the present invention; Figure 3 This is a top cross-sectional view of the multi-group electro-oxidation electrode plate structure of the present invention; Figure 4 This is a top cross-sectional view of the steam-water separator structure of the present invention; Figure 5 This is a top cross-sectional view of the microporous diffusion filter nozzle structure of the present invention; Figure 6 This is a front cross-sectional view of the microporous diffusion filter nozzle structure of the present invention; Figure 7 This is a front view of the polygonal perforated ozone tube structure of the present invention; Figure 8 This is a rear view of the expanded granular sludge tank, nitrification tank, and aeration pump structure of the present invention. Figure 9 This is a side sectional view of the expanded granular sludge tank, nitrification tank, and aeration pump structure of the present invention. Figure 10 This is an internal structural view of the turbulence-disrupting component, jet component, flow-equalizing component, and aeration component of the present invention; Figure 11 This is a side view of the turbulence component structure of the present invention; Figure 12 This is a partially exploded view of the turbulence component structure of the present invention; Figure 13 This is a side view of the jet assembly and flow equalization assembly structure of the present invention; Figure 14 This is a partially exploded view of the jet assembly structure of the present invention; Figure 15 This is a partial cross-sectional view of the flow equalization component structure of the present invention.

[0019] Explanation of markings in the diagram: 1. Catalytic oxidation tower; 1.1. Cooling water pump; 1.2. Cooling tower; 2. Expanded granular sludge tank; 2.1. Submersible mixer; 2.2. Primary sludge return pump; 2.3. Embedded box; 3. Nitrification tank; 4. Secondary sedimentation tank; 4.1. Secondary sludge return pump; 4.2. Center-driven scraper; 1.3. Multiple sets of electro-oxidation electrode plates; 1.4. Electro-oxidation anode plate; 1.5. Electro-oxidation cathode plate; 1.6. Microporous diffusion filter nozzle; 1.7. Multi-sided perforated ozone tube; 1.8. Packing layer; 1.9. Gas-water separator. 51. Dual-head motor; 52. Main synchronous pulley; 53. Slave synchronous pulley; 54. Vertical gear carrier; 55. Horizontal gear carrier; 56. Planetary gear; 57. Baffle frame; 61. Aeration pump; 62. Rotating end; 63. Connecting end; 64. Jet pipe; 65. Jet aerator; 66. Small synchronous pulley; 67. Large synchronous pulley; 71. Reciprocating screw thread; 72. Screw sleeve; 73. Annular frame; 74. Flow equalization net; 75. Convex slide head; 76. Concave slide groove; 9. Upper differential gear; 10. Baffle vane; 11. Lower differential gear; 12. Baffle rod. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: Example 1 like Figures 1-7 As shown, the multifunctional and efficient catalytic oxidation-biological coupling treatment device for nylon wastewater of the present invention includes a catalytic oxidation tower 1. One inlet of the catalytic oxidation tower 1 is connected to a cooling water pump 1.1, and the other inlet of the catalytic oxidation tower 1 is connected to a cooling tower 1.2 which is refluxed through the cooling water pump 1.1. Multiple sets of electro-oxidation electrode plates 1.3 are embedded within the catalytic oxidation tower 1, and the multiple sets of electro-oxidation electrode plates 1.3 are composed of an electro-oxidation anode plate 1.4 and an electro-oxidation cathode plate 1.5 arranged in an alternating circular pattern, achieving comprehensive electro-oxidation treatment of the wastewater. The top of the catalytic oxidation tower is equipped with a microporous diffusion filter nozzle 1.6, which is arranged in an array to separate the bubbles generated during the wastewater treatment process and play a defoaming role. The microporous diffusion filter nozzle 1.6 is connected to a multi-sided perforated ozone tube 1.7 above it for ozone reaction treatment of the wastewater. The catalytic oxidation tower 1 is filled with a packing layer 1.8 above the multi-sided perforated ozone tube 1.7, and a gas-water separator 1.9 is set above the packing layer 1.8. The catalytic oxidation of wastewater and ozone and the gas-water separation effect allow the wastewater to complete the second oxidation. An expanded granular sludge tank 2 is connected to the outlet of the catalytic oxidation tower 1. A submersible mixer 2.1 for mixing granular sludge is installed inside the expanded granular sludge tank 2. A primary sludge return pump 2.2 is connected to the outlet of the expanded granular sludge tank 2 to return and collect the sludge in the expanded granular sludge tank 2. An embedded box 2.3 is embedded in the expanded granular sludge tank 2 near the granular sludge area. The outlet of the primary sludge return pump 2.2 is connected to the nitrification tank 3. One outlet of the nitrification tank 3 is connected to the secondary sedimentation tank 4. The outlet at the bottom of the nitrification tank 3 is connected to the secondary sedimentation tank 4 through a secondary sludge return pump 4.1. A central drive scraper 4.2 rotating in the middle of the secondary sedimentation tank 4 scrapes and cleans the sludge in the secondary sedimentation tank 4. Wastewater from the equalization tank is pumped and connected to the inlet of catalytic oxidation tower 1 via pipeline. A dual-stage power supply for electro-oxidation is connected, with the electro-oxidation current density adjusted to 20 mA / cm² and the reaction time set to 30 minutes. The progress of multiple electro-oxidation reactions is monitored through observation ports. An external cooling tower 1.2 reduces the heat generated during these reactions, keeping the wastewater temperature below 40°C. Simultaneously, a large number of dense bubbles are generated during electro-oxidation. If not treated promptly, these bubbles can affect the ozone oxidation effect in the upper layer. The wastewater is separated from the bubbles by a microporous diffusion filter nozzle 1.6, which has a diameter of 100 mm and a hole diameter of 5 mm. This completes the first stage of oxidation for the wastewater. The wastewater continues to flow towards the top of the tower, where an ozone inlet is located. This inlet connects to an ozone generator, with an ozone dosage of 25 mg / L. An ORP meter and a COD meter are installed on the ozone pipeline for dynamic and intelligent control of the reaction process. The ozone pipeline inside the tower features multi-sided perforations to increase the contact area between ozone and wastewater, improving ozone utilization by 30%. Above the ozone pipeline is a packing layer 1.8, composed of a mixture of activated carbon, ceramsite, and Fe2O3 in a 6:3:1 ratio. The packing layer 1.8 is 1 m high, and the ozone catalytic time is 60 minutes, achieving the desired ozone catalytic oxidation effect, completing the second oxidation of the wastewater. Excess ozone and wastewater are separated at the top of the tower by a gas-water separator 1.9. The separated ozone is then treated by an ozone destroyer at the top outlet before being released into the atmosphere. The separated wastewater flows by gravity from the outlet on the top side wall of the tower to the bottom inlet of the expanded granular sludge tank 2. After undergoing two efficient oxidation processes, the large molecular organic matter and toxic and harmful substances in the wastewater are decomposed, improving the biodegradability of the wastewater. Expanded granular sludge tank 2 is filled with granular sludge at one-fifth of its volume. The tank is equipped with intelligent control instruments including a pH meter (6.5~7.5), an ORP meter (-50~-300mV), and a TT meter (30~35℃), which monitor the reaction in real time. A submersible mixer 2.1 is also included. Expanded granular sludge tank 2 is connected to the upper inlet of nitrification tank 3 via a pipe. Nitrification tank 3 is equipped with intelligent control instruments including a pH meter (7.5~8.5), a DO meter (2~3mg / L), a TT meter (30~35℃), and an electric regulating valve. Based on a "feedforward + model + feedback" mode, the blower airflow is dynamically adjusted (reducing aeration energy consumption by 30%). A return port is located at the bottom of nitrification tank 3, connected via a pipe to the inlet of a primary sludge return pump 2.2. The outlet of the primary sludge return pump 2.2 is connected via a pipe to the return port of expanded granular sludge tank 2, thus realizing the nitrification-denitrification process of wastewater.The nitrification tank 3 has an outlet at the top, which is connected to the inlet of the secondary sedimentation tank 4 through a pipe. The inlet of the secondary sedimentation tank 4 transports wastewater to the guide tube of the central drive sludge scraper 4.2 through a pipe. The wastewater diffuses from the guide tube to the surrounding area and is discharged from the system after passing through the surrounding weirs. The bottom of the secondary sedimentation tank 4 is equipped with a sludge hopper. The central drive sludge scraper 4.2 collects the sludge at the bottom of the tank into the sludge hopper. The bottom of the sludge hopper is connected to the inlet of the secondary sludge return pump 4.1 through a pipe to realize the functions of sludge discharge and sludge return.

[0021] Example 2 like Figures 8-15 As shown, the expanded granular sludge tank 2 is equipped with turbulence components around the inner box 2.3 to ensure full contact between the granular sludge and wastewater. The turbulence components include a double-headed motor 51 fixed to the back of the nitrification tank 3, and jet components and flow equalization components for the nitrification reaction of wastewater are respectively provided in the nitrification tank 3. The turbulence assembly also includes a main synchronous pulley 52 fixed on one output shaft of a dual-head motor 51, and a driven synchronous pulley 53 driven by a synchronous belt. A vertical gear frame 54 is fixed inside the driven synchronous pulley 53. The dual-head motor 51 drives the vertical gear frame 54 on the driven synchronous pulley 53 to rotate linearly via the synchronous belt on the main synchronous pulley 52. ​​A horizontal gear frame 55 meshes with the bottom of the vertical gear frame 54 and rotates with the expanded granular sludge tank 2 and the inner box 2.3. A planetary gear 56 meshes with the outside of the horizontal gear frame 55, and a turbulence frame 57 for full contact between the granular sludge and wastewater is fixed on the outside of the planetary gear 56. The vertical gear frame 54 drives the turbulence frames 57 on multiple sets of planetary gears 56 to rotate accordingly, which effectively turbulents the granular sludge and wastewater in the expanded granular sludge tank 2, so that they are fully released and the solid particles in the wastewater are fully absorbed to realize the nitrification reaction of the wastewater. The planetary gear 56 is meshed with an upper differential gear 9 at its top, and the top of the upper differential gear 9 is fitted with a turbulence vane 10 for turbulent flow of wastewater above the expanded granular sludge tank 2, which achieves a comprehensive turbulence effect on the wastewater above the expanded granular sludge tank 2. The planetary gear 56 is meshed with a lower differential gear 11 at its bottom, and the bottom of the lower differential gear 11 is fixed with a turbulence rod 12 for further turbulent flow and mixing of granular sludge and wastewater below the expanded granular sludge tank 2, which fully agitates and mixes the granular sludge and wastewater below the expanded granular sludge tank 2, so that the particulate impurities in the wastewater are fully absorbed by the granular sludge.

[0022] The jet assembly includes an aeration pump 61 mounted on the nitrification tank 3, with a rotating end 62 connected to one outlet of the aeration pump 61. A connecting end 63 is connected within the rotating end 62, and the two are in a state of mutual communication. A jet pipe 64, connected to the bottom of the connecting end 63, extends to the bottom of the nitrification tank 3 and rotates therewith. The pressurized air source generated by the aeration pump 61 is first supplied into the jet pipe 64 through the rotating end 62 and the connecting end 63, which are in a state of mutual communication. The bottom end of the jet pipe 64 is connected to a jet aerator 6 for wastewater nitrification. 5. A small synchronous pulley 66 is fitted on the outer end of the jet pipe 64 near the connecting end 63. A large synchronous pulley 67, which is fixedly matched with the other output shaft of the dual-head motor 51, is driven by a synchronous belt. The jet pipe 64 supplies pressurized air to the jet aerator 65. At the same time, the dual-head motor 51 drives the jet pipe 64 on the small synchronous pulley 66 to rotate linearly through the synchronous belt on the large synchronous pulley 67. The pressurized air in the jet aerator 65 is rotated and released into the nitrification tank 3 in a swirling jet manner, which further improves the nitrification reaction of the wastewater in the nitrification tank 3. The flow equalization assembly includes a reciprocating screw thread 71 sleeved on the outer end of the jet pipe 64, and a screw sleeve 72 threaded onto the reciprocating screw thread 71. An annular frame 73 is sleeved on the outer side of the screw sleeve 72, and a flow equalization net 74 is circumferentially embedded in the annular frame 73. A convex sliding head 75 is fixed on the outer circumference of the annular frame 73, and a concave sliding groove 76 is opened on the inner circumference of the nitrification tank 3 to slide and engage with the convex sliding head 75 for stable lifting and lowering of the annular frame 73. With the convex sliding head 75 and the concave sliding groove 76 providing sliding limit engagement for the annular frame 73, the linearly rotating reciprocating screw thread 71 drives the annular frame 73 to reciprocate and lift through the screw sleeve 72. Subsequently, the annular frame 73 drives the circumferentially distributed flow equalization net 74 to reciprocate and lift in the central area of ​​the nitrification tank 3, thereby equalizing the flow of wastewater in the central area of ​​the nitrification tank 3, making it uniform and sufficient for nitrification reaction, and further improving the nitrification reaction rate of the wastewater.

[0023] A multifunctional and highly efficient catalytic oxidation-biological coupling method for treating nylon wastewater includes the following steps: Step 1: First, connect the wastewater from the external equalization tank to the inlet of the catalytic oxidation tower 1 via a pump and pipeline. Then, connect the positive and negative power supplies to the electro-oxidation anode plate 1.4 and electro-oxidation cathode plate 1.5 of the multiple sets of electro-oxidation electrode plates 1.3, and adjust the electro-oxidation current density to the predetermined value. Check the electro-oxidation reaction between the multiple sets of electro-oxidation electrode plates 1.3 and the wastewater through the observation port. Reduce the heat generated during the electro-oxidation reaction of the multiple sets of electro-oxidation electrode plates 1.3 by the cooling water pump 1.1 and the external cooling tower 1.2, so that the wastewater temperature is below 40℃. At the same time, when a large number of dense bubbles are generated during the electro-oxidation process of the multiple sets of electro-oxidation electrode plates 1.3, the wastewater can be separated from the bubbles by passing through the microporous diffusion filter nozzle 1.6. Thus, the wastewater completes the first oxidation. Step 2: The wastewater continues to flow to the top of the catalytic oxidation tower 1. At the top of the catalytic oxidation tower 1 is an ozone inlet, which is connected to an ozone generator via a multi-perforated ozone tube 1.7. An ORP meter and a COD meter are externally connected to the multi-perforated ozone tube 1.7, allowing for dynamic and intelligent control of the reaction process. After ozone is introduced into the catalytic oxidation tower 1 through the multi-perforated ozone tube 1.7, the contact area between the ozone and the wastewater is increased. A packing layer 1.8 is installed above the multi-perforated ozone tube 1.7 to achieve the catalytic oxidation effect of ozone on the wastewater at the top of the catalytic oxidation tower 1, completing the second oxidation of the wastewater. Step 3: Excess ozone and wastewater at the top of catalytic oxidation tower 1 are separated by gas-water separator 1.9. The separated ozone is discharged into the atmosphere after being treated by an external intelligent control instrument and ozone destroyer at the top outlet of catalytic oxidation tower 1. The separated wastewater flows by gravity from the outlet on the top side wall of catalytic oxidation tower 1 to the bottom inlet of expanded granular sludge tank 2 through a pipeline. After two efficient oxidation processes, the large molecular organic matter and toxic and harmful substances in the wastewater are decomposed, further improving the biodegradability of the wastewater. Step 4: One-fifth of the volume of granular sludge was added to the expanded granular sludge tank 2 beforehand. The reaction between the granular sludge and wastewater in the expanded granular sludge tank 2 was monitored in real time by intelligent control instruments such as pH meter, ORP meter, and TT meter connected to the outside of the expanded granular sludge tank 2. A submersible mixer 2.1 was installed near the granular sludge area of ​​the expanded granular sludge tank 2. The expanded granular sludge tank 2 was connected to the upper inlet of the nitrification tank 3 through a pipeline. Intelligent control instruments such as pH meter, DO meter, TT meter, and electric regulating valve were connected to the outside of the nitrification tank 3. Based on the "feedforward + model + feedback" mode, the air volume of the blower was dynamically adjusted to promote the nitrification reaction process of the wastewater. Step 5: During this period, first control the dual-head motor 51 to start and drive the main synchronous pulley 52 to rotate linearly. The main synchronous pulley 52 drives the vertical gear frame 54 on the synchronous pulley 53 to rotate through the synchronous belt. The vertical gear frame 54 drives multiple sets of planetary gears 56 on the horizontal gear frame 55 to rotate linearly in the inner box 2.3. Then, the multiple sets of planetary gears 56 drive the baffle frame 57 to fully contact and turbulently treat the granular sludge and wastewater in the expanded granular sludge tank 2. At the same time, the planetary gears 56 drive the upper differential gear 9 and the lower differential gear 11 to rotate linearly. The upper differential gear 9 drives the baffle blade 10 to turbulently treat the wastewater in the middle of the expanded granular sludge tank 2, and the lower differential gear 11 drives the baffle rod 12 to further turbulently treat the granular sludge and wastewater in the expanded granular sludge tank 2, so that the granular sludge and wastewater can fully react. Step Six: The bottom of the nitrification tank 3 is equipped with a return port, which is connected to the inlet of the primary sludge return pump 2.2 through a pipe. The outlet of the primary sludge return pump 2.2 is connected to the return port of the expanded granular sludge tank 2 through a pipe, realizing the nitrification-denitrification process of wastewater. During this period, the aeration pump 61, which is in the open state, supplies the pressurized air source generated by it into the jet pipe 64 through the rotating end 62 and the connecting end 63, which are in a state of mutual rotation and communication. Then, the jet aerator 65 sprays and releases the pressurized air source to the bottom of the nitrification tank 3, promoting the uniform nitrification reaction of the wastewater in the nitrification tank 3. At the same time, the dual-head motor 51 also drives the large synchronous wheel 67 to rotate linearly. The large synchronous wheel 67 drives the jet pipe 64 on the small synchronous wheel 66 to rotate through the synchronous belt. Then, the jet pipe 64 drives the jet aerator 65 to spray and release the pressurized air source in a swirling manner, further improving the uniformity of the nitrification reaction of the wastewater in the nitrification tank 3. At the same time, the linearly rotating jet pipe 64 drives the reciprocating screw tooth 71 to rotate synchronously. The reciprocating screw tooth 71 drives the screw sleeve 72 to reciprocate up and down. With the sliding limit cooperation of the convex slide head 75 and the concave slide groove 76 on the annular frame 73, the screw sleeve 72 drives the flow equalization net 74 on the annular frame 73 to reciprocate up and down in the middle area of ​​the nitrification tank 3, thereby equalizing the flow of wastewater in the middle area of ​​the nitrification tank 3, so that the nitrification reaction can be further uniform and sufficient. Step 7: The nitrification tank 3 has an outlet at the top, which is connected to the inlet of the secondary sedimentation tank 4 through a pipe. The inlet of the secondary sedimentation tank 4 transports wastewater to the guide tube of the central drive scraper 4.2 through a pipe. The wastewater diffuses from the guide tube to the surrounding area and is discharged from the system through the surrounding weirs after treatment. The bottom of the secondary tank is equipped with a sludge hopper. The central drive scraper 4.2 collects the sludge at the bottom of the tank into the sludge hopper. The bottom of the sludge hopper is connected to the inlet of the secondary sludge return pump 4.1 through a pipe to realize the functions of sludge discharge and sludge return.

[0024] It should be noted that the specific models and specifications of the cooling water pump 1.1, submersible mixer 2.1, primary sludge return pump 2.2, secondary sludge return pump 4.1, center-driven scraper 4.2, multiple sets of electro-oxidation electrode plates 1.3, air-water separator 1.9, dual-head motor 51, aeration pump 61, and various valves need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt existing technology in this field, so they will not be elaborated in detail.

[0025] The power supply circuits for the cooling water pump 1.1, submersible mixer 2.1, primary sludge return pump 2.2, secondary sludge return pump 4.1, center-driven scraper 4.2, multiple sets of electro-oxidation electrode plates 1.3, air-water separator 1.9, dual-head motor 51, aeration pump 61, and various valves are clear to those skilled in the art and will not be described in detail here.

[0026] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. Multifunctional high-efficiency catalytic oxidation-biological coupling treatment device for nylon wastewater, comprising a catalytic oxidation tower (1), characterized in that: An inlet of the catalytic oxidation tower (1) is communicated with a cooling water pump (1.1), and another inlet of the catalytic oxidation tower (1) is communicated with a cooling tower (1.2) communicated with the cooling water pump (1.1) in reflux; An outlet of the catalytic oxidation tower (1) is communicated with an expanded granular sludge tank (2), a submersible mixer (2.1) for mixing granular sludge is arranged in the expanded granular sludge tank (2), a primary sludge reflux pump (2.2) is communicated with an outlet of the expanded granular sludge tank (2), and an embedded box (2.3) is embedded near the granular sludge area of the expanded granular sludge tank (2); An outlet of the primary sludge reflux pump (2.2) is communicated with a nitrification tank (3), one outlet of the nitrification tank (3) is communicated with a secondary sedimentation tank (4), an outlet at the bottom of the nitrification tank (3) is communicated with the secondary sedimentation tank (4) through a secondary sludge reflux pump (4.1), and a central transmission mud scraper (4.2) is rotatably arranged in the middle of the secondary sedimentation tank (4); The periphery of the expanded granular sludge tank (2) near the embedded box (2.3) is provided with a turbulence assembly for fully contacting the granular sludge and wastewater, and the turbulence assembly comprises a double-head motor (51) fixed on the back of the nitrification tank (3), and a jet assembly and a uniform flow assembly for wastewater nitrification reaction are arranged in the nitrification tank (3).

2. The multifunctional high-efficiency catalytic oxidation-biological coupling device for treating nylon wastewater according to claim 1, characterized in that: A plurality of groups of electro-oxidation electrode plates (1.3) are embedded in the catalytic oxidation tower (1), and the plurality of groups of electro-oxidation electrode plates (1.3) are composed of circumferentially staggered electro-oxidation anode plates (1.4) and electro-oxidation cathode plates (1.5).

3. The multifunctional high-efficiency catalytic oxidation-biological coupling device for treating nylon wastewater according to claim 2, characterized in that: A microporous diffusion type filter spray head (1.6) is embedded at the top of the catalytic oxidation tower (1) and is distributed in an array shape, and a multi-edge opening ozone pipe (1.7) is communicated above the microporous diffusion type filter spray head (1.6).

4. The multifunctional high-efficiency catalytic oxidation-biological coupling device for treating nylon wastewater according to claim 3, characterized in that: A filler layer (1.8) is filled above the multi-edge opening ozone pipe (1.7) near the catalytic oxidation tower (1), and a steam-water separator (1.9) is arranged above the filler layer (1.8).

5. The multifunctional high-efficiency catalytic oxidation-biological coupling device for treating nylon wastewater according to claim 4, characterized in that: The turbulence assembly further comprises a main synchronous wheel (52) fixed on one output shaft of the double-head motor (51), a slave synchronous wheel (53) driven by a synchronous belt, a vertical gear rack (54) fixed in the slave synchronous wheel (53), a horizontal gear rack (55) meshing with the expanded granular sludge tank (2) and the embedded box (2.3) at the bottom of the vertical gear rack (54), a planetary gear (56) meshing with the outer side of the horizontal gear rack (55), and a turbulence rack (57) for fully contacting the granular sludge and wastewater fixed on the outer side of the planetary gear (56).

6. The multifunctional high-efficiency catalytic oxidation-biological coupling device for treating nylon wastewater according to claim 5, characterized in that: The jet flow assembly includes an aeration pump (61) arranged on the nitration tank (3), a rotating end (62) communicated with an outlet of the aeration pump (61), a communicating end (63) communicated in the rotating end (62) and kept in intercommunication with each other, and a jet flow pipe (64) communicated at a bottom end of the communicating end (63) and extending to the bottom of the nitration tank (3) and rotationally fitted with the nitration tank (3), and a jet flow aerator (65) for the wastewater nitration reaction communicated with the bottom end of the jet flow pipe (64), and a small synchronous wheel (66) sleeved on an outer end of the jet flow pipe (64) close to the communicating end (63), and a large synchronous wheel (67) fixedly fitted with the other output shaft of the double-head motor (51) driven by the synchronous belt.

7. The multifunctional high-efficiency catalytic oxidation-biological coupling device for treating nylon wastewater according to claim 6, characterized in that: The uniform flow assembly includes a reciprocating screw rod tooth (71) sleeved on the outer end of the jet flow pipe (64), a screw rod sleeve (72) threadedly connected on the reciprocating screw rod tooth (71), an annular framework (73) sleeved on the outer side of the screw rod sleeve (72), a uniform flow net (74) circumferentially embedded in the annular framework (73), a convex slide head (75) fixed on the outer circumference of the annular framework (73), and a concave slide groove (76) circumferentially arranged in the nitration tank (3) and slidably fitted with the convex slide head (75) for the stable lifting of the annular framework (73).

8. The multifunctional high-efficiency catalytic oxidation-biological coupling device for treating nylon wastewater according to claim 7, characterized in that: The top of the planetary gear (56) is engaged with an upper differential gear (9), and the top of the upper differential gear (9) is sleeved with a turbulence blade (10) for disturbing the wastewater above the expanded granular sludge tank (2).

9. The multifunctional high-efficiency catalytic oxidation-biological coupling device for treating nylon wastewater according to claim 8, characterized in that: The bottom of the planetary gear (56) is engaged with a lower differential gear (11), and the bottom of the lower differential gear (11) is fixed with a turbulence rod (12) for further disturbing and mixing the granular sludge and wastewater below the expanded granular sludge tank (2).

10. The method for treating nylon wastewater by multi-functional high-efficiency catalytic oxidation-biological coupling process, comprising the device for treating nylon wastewater by multi-functional high-efficiency catalytic oxidation-biological coupling process according to any one of claims 1-9, characterized in that: The method comprises the following steps: Step one, first connect the wastewater in the external adjusting pool to the water inlet of the catalytic oxidation tower (1) through the pump and pipeline, then connect the positive and negative two-stage power supply of the electric oxidation anode plate (1.4) and the electric oxidation cathode plate (1.5) in the multiple sets of electric oxidation electrode plates (1.3), adjust the electric oxidation current density to a predetermined value, observe the electric oxidation reaction of the multiple sets of electric oxidation electrode plates (1.3) and the wastewater through the observation port, reduce the heat generated in the electric oxidation reaction process of the multiple sets of electric oxidation electrode plates (1.3) by the cooling water pump (1.1) and the external cooling tower (1.2), so that the wastewater temperature is lower than 40℃, and at the same time, when a large amount of dense bubbles are generated in the electric oxidation process of the multiple sets of electric oxidation electrode plates (1.3), the wastewater can be separated from the bubbles through the microporous diffusion type filter nozzle (1.6), and thus the wastewater completes the first oxidation. Step two, the wastewater continues to the top of the catalytic oxidation tower (1), there is an ozone inlet in the upper part of the catalytic oxidation tower (1), which is connected with the ozone generator through the multi-edge ozone pipe (1.7), and the ORP instrument and COD instrument are connected outside the multi-edge ozone pipe (1.7), which can dynamically and intelligently control the reaction process. After the ozone is introduced into the catalytic oxidation tower (1) through the multi-edge ozone pipe (1.7), the contact area between the ozone and the wastewater is increased, and a filler layer (1.8) is arranged above the multi-edge ozone pipe (1.7), so as to achieve the catalytic oxidation effect of the wastewater and the ozone at the top of the catalytic oxidation tower (1), and the wastewater is oxidized for the second time; Step three, the excess ozone at the top of the catalytic oxidation tower (1) is separated from the wastewater by a steam-water separator (1.9), the separated ozone is discharged into the atmosphere after being treated by the external intelligent control instrument and the ozone destroyer through the outlet at the top of the catalytic oxidation tower (1), and the separated wastewater is self-flowed from the top side wall outlet of the catalytic oxidation tower (1) to the water inlet at the bottom of the expanded granular sludge tank (2) through the pipeline, the macromolecular organic matter and toxic and harmful substances in the wastewater are decomposed after two high-efficiency oxidations, and the biodegradability of the wastewater is further improved; Step four, one fifth of the volume of granular sludge is added in advance in the expanded granular sludge tank (2), the reaction between the granular sludge and the wastewater in the expanded granular sludge tank (2) is monitored in real time by the intelligent control instruments pH instrument, ORP instrument and TT instrument connected outside the expanded granular sludge tank (2), and a submersible mixer (2.1) is arranged near the granular sludge area of the expanded granular sludge tank (2), the expanded granular sludge tank (2) is connected with the upper water inlet of the nitrification tank (3) through the pipeline, and the intelligent control instruments pH instrument, DO instrument, TT instrument and electric regulating valve are connected outside the nitrification tank (3), based on the "feedforward + model + feedback" mode, the air volume of the fan is dynamically adjusted to promote the nitrification reaction process of the wastewater; Step five, during this period, the double-head motor (51) is first controlled to be turned on and drive the main synchronous wheel (52) to rotate linearly, the main synchronous wheel (52) drives the vertical gear frame (54) on the slave synchronous wheel (53) to rotate, the vertical gear frame (54) drives the multiple groups of planetary gears (56) on the horizontal gear frame (55) to rotate linearly in the embedded box (2.3), then the multiple groups of planetary gears (56) drive the turbulence frame (57) to fully contact and turbulence treat the granular sludge and wastewater in the expanded granular sludge tank (2), at the same time, the planetary gears (56) drive the upper differential gear (9) and the lower differential gear (11) to rotate linearly, the upper differential gear (9) drives the turbulence blade (10) to turbulence treat the wastewater in the middle of the expanded granular sludge tank (2), and the lower differential gear (11) drives the turbulence rod (12) to further turbulence treat the granular sludge and wastewater in the expanded granular sludge tank (2), so that the granular sludge and wastewater fully react; Step six, the bottom of the nitrification tank (3) is provided with a backflow port, the backflow port is connected with the inlet of the first sludge backflow pump (2.2) through a pipeline, the outlet of the first sludge backflow pump (2.2) is connected with the backflow port of the expanded granular sludge tank (2) through a pipeline, and the nitrification-denitrification process of wastewater is realized. During this period, the booster gas source generated by the aeration pump (61) in the open state is supplied into the jet pipe (64) through the rotating end (62) and the communication end (63) which keep rotating with each other in turn, and then the jet aeration device (65) sprays and releases the booster gas source to the bottom of the nitrification tank (3), so as to promote the uniform nitrification reaction of the wastewater in the nitrification tank (3). At the same time, the double-head motor (51) also drives the large synchronous wheel (67) to rotate linearly, the large synchronous wheel (67) drives the small synchronous wheel (66) to rotate through the synchronous belt, and then the jet pipe (64) drives the jet aeration device (65) to spray and release the booster gas source in the form of cyclone, so as to further improve the uniformity of the nitrification reaction of the wastewater in the nitrification tank (3); At the same time, the linearly rotating jet pipe (64) drives the reciprocating screw rod tooth (71) to rotate synchronously, the reciprocating screw rod tooth (71) drives the screw rod sleeve (72) to reciprocate and lift, and then the screw rod sleeve (72) drives the uniform flow net (74) on the annular framework (73) to reciprocate and lift in the middle part of the nitrification tank (3) through the sliding limiting cooperation of the convex sliding head (75) and the concave sliding groove (76) on the annular framework (73), so as to treat the wastewater in the middle part of the nitrification tank (3) to make it further uniform and fully nitrify; Step seven, the upper part of the nitrification tank (3) is provided with a water outlet, the water outlet is connected with the inlet of the secondary sedimentation tank (4) through a pipeline, the wastewater is transported to the guide cylinder of the center transmission mud scraper (4.2) through the inlet of the secondary sedimentation tank (4), the wastewater diffuses from the guide cylinder to the surrounding, and then the treated water meeting the standard is discharged from the system through the water weir around, the bottom of the secondary tank is provided with a sludge hopper, the sludge at the bottom of the tank is gathered in the sludge hopper through the center transmission mud scraper (4.2), and the bottom of the sludge hopper is connected with the inlet of the second sludge backflow pump (4.1) through a pipeline, so as to realize the functions of sludge discharge and sludge backflow.

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