A multi-stage harmless treatment system for landfill leachate with biological and ozone modules

Abstract

This invention discloses a multi-stage harmless treatment system for landfill leachate with biological and ozone modules, relating to the field of wastewater filtration technology. It includes: a first biological treatment component for treating filtered landfill leachate; a nozzle connected to the discharge end of the first biological treatment component; an integrated pipe fitted over the nozzle, the top end of which is connected to an ozone tank, the integrated pipe being used to generate high-frequency oscillations in the gas-liquid mixture; and a pressurization component having a first inlet end and a second inlet end, the first inlet end being connected to the integrated pipe, the second inlet end being used to introduce supplementary fluid, and the pressurization component also having an outlet end, the outlet end being sequentially connected to a catalytic chamber and a second biological treatment component. In this invention, the steps of first performing biological treatment, then ozone catalysis, and finally further biological treatment ensure that the final effluent meets discharge standards.

Description

Technical Field

[0001] This invention relates to the field of wastewater filtration technology, specifically to a multi-stage harmless treatment system for landfill leachate with biological and ozone modules. Background Technology

[0002] Landfill leachate is characterized by its complex composition, high pollutant concentration, and large amount of recalcitrant organic matter. Currently, the industry commonly employs a two-stage combined process of "ozone catalytic oxidation + biological treatment" for high-concentration recalcitrant landfill leachate. The initial aim is to utilize the strong oxidizing properties of ozone and the hydroxyl radicals it catalyzes to break down and open the rings of large recalcitrant organic molecules, converting them into smaller, easily degradable substances, which are then removed through biological treatment. In this process, the initial COD of the raw landfill leachate is high, with the majority being easily degradable organic matter. In the "pre-oxidation" mode, ozone not only needs to attack the large recalcitrant molecules but also undergoes non-selective, ineffective oxidation reactions with a large amount of easily degradable organic matter. Especially under existing conventional microporous aeration or mechanical stirring contact methods, rapid bubble coalescence, small gas-liquid contact area, and extremely low mass transfer rate result in a large amount of ozone escaping without participating in the reaction.

[0003] Therefore, it is necessary to provide a multi-stage harmless treatment system for landfill leachate with biological and ozone modules to solve the above problems. Summary of the Invention

[0004] To address the above problems, the present invention provides the following technical solution: a multi-stage harmless treatment system for landfill leachate with biological and ozone modules, comprising: The first biological treatment unit is used to treat filtered landfill leachate; The nozzle is connected to the drain end of the first biological treatment component; An integrated tube is sleeved on the outside of the nozzle, and the top end of the integrated tube is connected to the ozone tank. The integrated tube is used to generate high-frequency oscillation of the gas-liquid mixture. The pressurization assembly has a first liquid inlet and a second liquid inlet. The first liquid inlet is connected to the integrated pipe, and the second liquid inlet is used to introduce supplementary fluid. The pressurization assembly has a structure that can rotate relative to each other to form a turbulent pressurization of the fluid. The pressurization assembly also has a liquid outlet, which is connected in sequence to the catalytic chamber and the second biological treatment assembly.

[0005] Furthermore, preferably, the top end of the integrated tube is funnel-shaped and surrounds the nozzle, maintaining a distance from the nozzle; the middle part of the integrated tube is cylindrical; the bottom end of the integrated tube is trumpet-shaped; and a vibrating plate is fixed in the middle part of the integrated tube.

[0006] Furthermore, preferably, the top of the vibrator is close to the nozzle, and the middle of the vibrator corresponds to the connection between the middle and top of the integrated tube.

[0007] Furthermore, as a preferred embodiment, the vibrator is made of an elastic and corrosion-resistant material.

[0008] Furthermore, preferably, the pressurization component includes: The top seat is disc-shaped and has a protrusion at its bottom end. The integrated tube is installed on the top seat, and the protrusion has a liquid inlet as the first liquid inlet end. The base is disc-shaped, and the top of the base has a groove corresponding to the protrusion. Multiple spray holes are opened on the groove as the second liquid inlet, and the second liquid inlet is connected to the replenishment pipe. Mounting bracket, which is used to rotatably connect the base and the supplementary tube, the supplementary tube being driven by a drive assembly, and the mounting bracket being used to mount the top mount.

[0009] Furthermore, preferably, a buffer space and a first channel are formed between the protrusion and the groove. The first channel is located on the periphery of the protrusion, and the buffer space is located between the bottom end of the protrusion and the bottom of the groove. A second channel is formed between the top seat and the base. The buffer space, the first channel, and the second channel are connected in sequence. The second channel is an annular space and serves as the liquid outlet. The second channel is surrounded by the mounting base, and the mounting base is connected to the catalytic chamber through a pipe.

[0010] Furthermore, as a preferred embodiment, the bottom end face of the top seat is provided with a plurality of first flow channels arranged in a circumferential array along the top seat. The first flow channels extend radially along the top seat and extend from the first channel to the outer edge of the top seat but do not penetrate the outer edge. The top surface of the base has multiple second channels corresponding to the first channel. The second channels extend radially along the base and extend from the outer edge of the base toward the first channel but do not penetrate the first channel. When the base rotates relative to the top seat, there is an overlapping area between the first channel and the second channel.

[0011] Furthermore, as a preferred embodiment, a push plate is connected to the first flow channel via an elastic element, and the push plate can reciprocate along the length direction of the first flow channel to achieve buffering and reset pressurization.

[0012] Furthermore, as a preferred embodiment, the inner wall of the integrated tube also has a stator, and a rotor is fitted in the middle of the stator, the rotor passing through the liquid inlet and connected to the groove.

[0013] Furthermore, as a preferred embodiment, the sidewall of the groove is fixed with a plurality of follower blades.

[0014] Compared with existing technologies, this invention provides a multi-stage harmless treatment system for landfill leachate with biological and ozone modules, which has the following beneficial effects: In this invention, a series of steps are adopted: first biological treatment, then ozone catalysis, and finally biological treatment. The first biological treatment removes easily degradable organic matter and completes denitrification to the greatest extent, avoiding unnecessary ozone consumption. The role of ozone is to break down large, difficult-to-decompose substances in the water into smaller molecules, making it easier for subsequent microorganisms to consume them, thereby ensuring that the final water meets the discharge standards.

[0015] In this invention, the force of the water flowing downwards is used to make the vibrator vibrate at high frequency, which initially breaks up the bubbles and improves the efficiency of ozone dissolving into the water.

[0016] In this invention, the pressurizing component, through the relative rotation between the components and the spring push plate inside, allows water to be continuously discharged while also generating pulse extrusion force. This extrusion force can forcibly dissolve tiny air bubbles in the water, thereby increasing the ozone concentration in the water without affecting the continuous water output of the equipment.

[0017] In this invention, the base and rotor are connected, and the rotating shear field is extended upward to the initial mixing section, realizing the whole process of double shearing and cell wall breaking without adding any additional power equipment. This ensures that the bubbles before entering the pressurization component are fully refined, greatly reducing the difficulty of subsequent pressurization and dissolution. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of a multi-stage harmless treatment system for landfill leachate with biological and ozone modules; Figure 2 A cross-sectional structural diagram of the pressurization component; Figure 3 for Figure 2 A magnified schematic diagram of the upper part of the structure; Figure 4 for Figure 2 A schematic diagram of the enlarged lower half of the structure; In the diagram: 1. First biological treatment component; 2. Ozone tank; 3. Nozzle; 4. Integrated tube; 5. Vibrating plate; 6. Stator; 7. Rotor; 8. Top seat; 9. Base; 10. First flow channel; 11. Second flow channel; 12. Follow-up blade; 13. Push plate; 14. Mounting seat; 15. Supplement pipe; 16. Drive component; 17. Catalytic chamber; 18. Second biological treatment component; 19. Spray hole; 20. Protrusion; 21. Groove; 22. Buffer space; 23. First channel; 24. Second channel. Detailed Implementation

[0019] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0020] Example: In this embodiment of the invention, please refer to... Figures 1-4 A multi-stage harmless treatment system for landfill leachate with biological and ozone modules is provided, comprising: First biological treatment component 1 is used to treat filtered landfill leachate; Nozzle 3 is connected to the drain end of the first biological treatment component 1; An integrated tube 4 is sleeved on the outside of the nozzle 3. The top end of the integrated tube 4 is connected to the ozone tank 2. The integrated tube 4 is used to generate high-frequency oscillation of the gas-liquid mixture. The pressurization component has a first inlet and a second inlet. The first inlet is connected to the integrated pipe 4, and the second inlet is used to introduce supplementary fluid. The pressurization component has a structure that can rotate relative to each other to create turbulent pressurization of the fluid. The pressurization component also has an outlet, which is connected in sequence to the catalytic chamber 17 and the second biological treatment component 18. This embodiment constructs a complete multi-stage treatment architecture. The leachate treated by the first biological treatment component 1 is ejected at high speed through the nozzle 3, forming a negative pressure zone in the integrated pipe 4. Ozone gas in the ozone tank 2 is supplied simultaneously to achieve preliminary gas-liquid mixing. Subsequently, the mixture enters the pressurization component, where the relative rotation structure inside applies turbulence and shear to the fluid, greatly improving the gas-liquid mass transfer efficiency. The fluid that has completed supersaturation dissolution enters the catalytic chamber 17 through the outlet for chain breaking and ring opening reactions, and finally flows into the second biological treatment component 18 for complete degradation.

[0021] In this embodiment, the top end of the integrated tube 4 is funnel-shaped and surrounds the nozzle 3, maintaining a distance from the nozzle 3. The middle part of the integrated tube 4 is cylindrical, the bottom end of the integrated tube 4 is trumpet-shaped, and a vibrating plate 5 is fixed in the middle of the integrated tube 4.

[0022] The funnel-shaped structure efficiently gathers the liquid flow ejected from the nozzle 3 and guides the ozone gas smoothly into the mixing zone. After entering the straight section, the fluid velocity stabilizes and directly impacts the vibrator 5. In other words, in this embodiment, the fluid's kinetic energy is converted into mechanical oscillation energy, and the vibrator 5 generates high-frequency mechanical vibration in the flow field, thereby exciting micro-eddies and shear waves inside the fluid, tearing the initially mixed bubbles into tiny bubbles, and achieving the first physical enhancement of mass transfer.

[0023] In this embodiment, the top of the vibrating plate 5 is close to the nozzle 3, and the middle part of the vibrating plate 5 corresponds to the connection between the middle and the top of the integrated tube 4. The top of the vibrating plate 5 is close to the nozzle 3, which can maximize the impact energy of the initial jet.

[0024] In this embodiment, the vibrating element 5 is made of an elastic, corrosion-resistant material. Landfill leachate and ozone environments have extremely strong oxidizing and corrosive properties. The elastic material ensures that the vibrating element 5 undergoes elastic deformation and recovers rapidly when subjected to high-frequency fluid impact, preventing plastic deformation or fatigue fracture. For example, the elastic, corrosion-resistant material can be any one of fluororubber or polytetrafluoroethylene composite materials.

[0025] In this embodiment, the pressurization component includes: Top seat 8, the top seat 8 is disc-shaped, the bottom end of the top seat 8 has a protrusion 20, the integrated tube 4 is installed on the top seat 8, and the protrusion 20 has a liquid inlet as the first liquid inlet end; The base 9 is disc-shaped, and the top of the base 9 has a groove 21 corresponding to the protrusion 20. The groove 21 is provided with a plurality of spray holes 19 as the second liquid inlet end, and the second liquid inlet end is connected to the replenishment pipe 15. Mounting base 14 is used to rotatably connect the base 9 and the supplementary tube 15. The supplementary tube 15 is also driven by the drive assembly 16. Mounting base 14 is also used to mount the top seat 8.

[0026] In this embodiment, the gas-liquid mixture discharged from the integrated pipe 4 enters the pressurization component through the liquid inlet of the protrusion 20. At the same time, the supplementary fluid is injected into the groove 21 through the nozzle 19 via the supplementary pipe 15. After the drive component 16 is started, the base 9 is rotated relative to the stationary top seat 8 through the supplementary pipe 15. That is to say, in this embodiment, a dynamically rotating cavity is constructed by the cooperation of the top seat 8 and the base 9 so that two streams of fluid can be introduced into the cavity. The addition of the supplementary fluid helps to adjust the hydraulic load and concentration of the overall system.

[0027] In this embodiment, a buffer space 22 and a first channel 23 are formed between the protrusion 20 and the groove 21. The first channel 23 is located on the periphery of the protrusion 20. The buffer space 22 is located between the bottom end of the protrusion 20 and the bottom of the groove 21. A second channel 24 is formed between the top seat 8 and the base 9. The buffer space 22, the first channel 23 and the second channel 24 are connected in sequence. The second channel 24 is an annular space and serves as the liquid outlet. The second channel 24 is surrounded by the mounting base 14. The mounting base 14 is connected to the catalyst chamber 17 through a pipe.

[0028] After the fluid enters the buffer space 22, it enters the first channel 23 around the protrusion 20 and finally flows into the annular second channel 24 between the top seat 8 and the base 9. Through the insertion and cooperation of the protrusion 20 and the groove 21, a folding buffer flow channel is constructed, which prolongs the residence and reaction time of the fluid in the pressurization component. In addition, the bottom end of the protrusion 20 and the bottom of the groove 21 can be in a rounded transition to minimize the flow dead zone.

[0029] In this embodiment, the bottom end face of the top seat 8 is provided with a plurality of first flow channels 10 arranged in a circumferential array along the top seat 8. The first flow channels 10 extend radially along the top seat 8 and extend from the first channel 23 to the outer edge of the top seat 8 but do not penetrate the outer edge. The top surface of the base 9 is provided with a plurality of second channels 11 corresponding to the first channel 10. The second channels 11 extend radially along the base 9 and extend from the outer edge of the base 9 toward the first channel 23 but do not penetrate the first channel 23. When the base 9 rotates relative to the top seat 8, there is an overlapping area between the first channel 10 and the second channel 11.

[0030] During implementation, fluid from the first channel 23 enters the first flow channel 10 and flows outward. Due to the continuous rotation of the base 9, the first flow channel 10 and the second flow channel 11 periodically misalign and overlap. When they misalign, the fluid is blocked by the solid part of the base 9; when they overlap, the flow channel is open, and the fluid is ejected inward through the second flow channel 11. As the fluid passes through the constantly overlapping and misaligned flow channels, it is forced to continuously change its flow direction, forming three-dimensional turbulent flow and high-frequency mechanical shearing, which deeply pulverizes the bubbles and achieves enhanced mass transfer.

[0031] In this embodiment, a push plate is connected to the first flow channel 10 by an elastic element. The push plate can reciprocate along the length of the first flow channel 10 to achieve buffering and reset pressurization.

[0032] Combined with the aforementioned rotating structure of the flow channel, when the base 9 rotates and causes the first flow channel 10 and the second flow channel 11 to be misaligned, the outward flow of fluid is obstructed. The fluid is throttled and discharged through the tiny gap between the push plate and the flow channel to establish a pressure difference. Its kinetic energy overcomes the resistance of the elastic element and pushes the push plate to move outward, completing the buffering and energy storage. When the flow channels rotate to coincide, the compressed elastic element quickly releases its potential energy, the push plate is forcefully reset, forming a local hydraulic pulsation, which quickly pushes the fluid in the flow channel out.

[0033] The elastic element is a compression spring with a polytetrafluoroethylene anti-corrosion layer on its surface, or a corrosion-resistant rubber elastic block.

[0034] Meanwhile, as the first channel 23 continues to discharge fluid to the second channel 24, the system as a whole maintains a continuous water output state, avoiding the impact of intermittent water output on subsequent processes.

[0035] In this embodiment, the inner wall of the integrated tube 4 also has a stator 6, and a rotor 7 is fitted in the middle of the stator 6. The rotor 7 passes through the liquid inlet and is connected to the groove 21.

[0036] Since the rotor 7 passes downward through the liquid inlet and connects to the groove 21 of the base 9, when the drive assembly 16 drives the base 9 to rotate, the rotational power is synchronously transmitted to the rotor 7, causing it to rotate relative to the stator 6. When the gas-liquid mixture flows downward through the gap between the stator 6 and the rotor 7, it is subjected to rotational shearing.

[0037] In other words, this embodiment utilizes a single power source from the bottom pressurization component to extend the rotating shear field upwards to the initial mixing section, achieving full-process dual shearing and cell wall breaking without adding any additional power equipment. This ensures that the bubbles before entering the pressurization component are sufficiently refined, significantly reducing the difficulty of subsequent pressurization and dissolution.

[0038] In this embodiment, a plurality of follower blades 12 are fixed on the side wall of the groove 21. The follower blades 12 are fixed on the side wall of the groove 21. When the base 9 rotates as a whole, the follower blades 12 rotate accordingly and agitate the fluid in the groove 21, further improving the uniformity and mixing degree of the fluid.

[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules, characterized in that, include: The first biological treatment component (1) is used to treat filtered landfill leachate; The nozzle (3) is connected to the drain end of the first biological treatment component (1); An integrated tube (4) is sleeved on the outside of the nozzle (3). The top end of the integrated tube (4) is connected to the ozone tank (2). The integrated tube (4) is used to generate high-frequency oscillation of the gas-liquid mixture. The pressurizing component has a first liquid inlet and a second liquid inlet. The first liquid inlet is connected to the integrated pipe (4), and the second liquid inlet is used to introduce supplementary fluid. The pressurizing component has a structure that can rotate relative to each other to form a turbulent pressurization of the fluid. The pressurizing component also has a liquid outlet, which is connected in sequence to the catalytic chamber (17) and the second biological treatment component (18).

2. The multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 1, characterized in that, The top of the integrated tube (4) is funnel-shaped and surrounds the nozzle (3), maintaining a distance from the nozzle (3). The middle part of the integrated tube (4) is cylindrical, and the bottom end of the integrated tube (4) is trumpet-shaped. A vibrating plate (5) is fixed in the middle of the integrated tube (4).

3. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 2, characterized in that, The top of the vibrating plate (5) is close to the nozzle (3), and the middle part of the vibrating plate (5) corresponds to the connection between the middle and the top of the integrated tube (4).

4. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 2, characterized in that, The vibrating element (5) is made of an elastic and corrosion-resistant material.

5. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 1, characterized in that, The pressurization component includes: Top seat (8), the top seat (8) is disc-shaped, the bottom end of the top seat (8) has a protrusion (20), the integrated tube (4) is installed on the top seat (8), and the protrusion (20) has a liquid inlet as the first liquid inlet end; The base (9) is disc-shaped. The top of the base (9) has a groove (21) corresponding to the protrusion (20). Multiple spray holes (19) are provided on the groove (21) as the second liquid inlet. The second liquid inlet is connected to the replenishment pipe (15). Mounting base (14) for rotatably connecting the base (9) and the supplementary tube (15), the supplementary tube (15) being driven by a drive assembly (16), the mounting base (14) also for mounting the top seat (8).

6. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 5, characterized in that, A buffer space (22) and a first channel (23) are formed between the protrusion (20) and the groove (21). The first channel (23) is located on the periphery of the protrusion (20). The buffer space (22) is located between the bottom end of the protrusion (20) and the bottom of the groove (21). A second channel (24) is formed between the top seat (8) and the base (9). The buffer space (22), the first channel (23) and the second channel (24) are connected in sequence. The second channel (24) is an annular space and serves as the liquid outlet. The second channel (24) is surrounded and wrapped by the mounting seat (14). The mounting seat (14) is connected to the catalyst chamber (17) through a pipe.

7. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 6, characterized in that, The bottom end face of the top seat (8) is provided with a plurality of first flow channels (10) arranged in a circumferential array along the top seat (8). The first flow channels (10) extend radially along the top seat (8) and extend from the first channel (23) to the outer edge of the top seat (8) but do not penetrate the outer edge. The top surface of the base (9) is provided with a plurality of second channels (11) corresponding to the first channel (10). The second channels (11) extend radially along the base (9) and extend from the outer edge of the base (9) toward the first channel (23) but do not penetrate the first channel (23). When the base (9) rotates relative to the top seat (8), there is an overlapping area between the first channel (10) and the second channel (11).

8. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 7, characterized in that, A push plate is connected to the first flow channel (10) by an elastic element. The push plate can move back and forth along the length of the first flow channel (10) to achieve buffering and reset pressurization.

9. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 5, characterized in that, The inner wall of the integrated tube (4) also has a stator (6), and a rotor (7) is fitted in the middle of the stator (6). The rotor (7) passes through the liquid inlet and is connected to the groove (21).

10. A multi-stage harmless treatment system for landfill leachate with biological and ozone modules according to claim 5, characterized in that, The sidewall of the groove (21) is fixed with multiple follower blades (12).

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