Solid waste landfill leachate treatment device

Abstract

The application discloses a solid waste landfill leachate treatment device and relates to the technical field of environmental protection water treatment. In order to solve the problems of poor biodegradability of old leachate, easy pollution and blockage of membrane components and large floor area of traditional equipment in the prior art, the following technical scheme is provided: an integrated treatment tank is arranged, and the inside of the integrated treatment tank is divided into a cyclone pretreatment cavity, an electro-catalytic oxidation cavity and an ultrasonic membrane biological reaction cavity which are sequentially connected through first and second partition plates. In the application, the refractory organic matter is broken into small molecules with high biodegradability through electro-catalytic oxidation, and the ultrasonic cavitation effect is utilized to realize in-situ physical cleaning of the membrane components in cooperation with bubble scrubbing, so that the application has the advantages of high treatment efficiency, light membrane pollution and high integration degree and is suitable for treatment of old leachate.

Description

Technical Field

[0001] This invention relates to the field of environmental water treatment equipment technology, specifically to a solid waste landfill leachate treatment device. Background Technology

[0002] Solid waste landfills generate large amounts of high-concentration leachate during operation and closure. Due to the complexity of waste types and processes such as anaerobic fermentation, the leachate is extremely complex, containing not only high concentrations of organic pollutants, ammonia nitrogen, and heavy metals, but also large amounts of suspended solids and high-hardness inorganic salts, making it a recognized challenge in the field of water treatment.

[0003] Currently, the mainstream process for treating solid waste landfill leachate in the industry mostly adopts a combined approach of "pretreatment + membrane bioreactor (MBR) + dual-membrane deep treatment (nanofiltration NF / reverse osmosis RO)". Although this process can achieve emission standards to a certain extent, long-term engineering practice has revealed the following significant shortcomings in existing technologies and related equipment: Aging leachate exhibits poor biodegradability, and traditional biological treatment units are inefficient. As landfills age, leachate gradually becomes "aged." The readily biodegradable carbon sources in the water are largely depleted, while the proportion of macromolecules and recalcitrant organic matter (such as humic substances, aromatic compounds, and long-chain aliphatic hydrocarbons) increases dramatically, resulting in extremely low biodegradability (B / C ratio) of the leachate. Existing MBR treatment units primarily rely on the natural metabolism of microorganisms. When dealing with aging leachate, microbial activity is severely inhibited, making it impossible to effectively degrade these macromolecular organic compounds. This leads to low efficiency in the front-end biological treatment, ultimately transferring the enormous pollutant load entirely to the downstream advanced treatment membrane units.

[0004] Membrane modules are highly susceptible to severe fouling and scaling, resulting in high operating costs. In traditional MBR biological treatment tanks, hollow fiber membrane modules are constantly immersed in a sludge-water mixture containing high concentrations of activated sludge, colloidal substances, and high-hardness salts. Contaminants in the leachate readily adhere to the membrane fiber surface and the interior of the micropores, forming a stubborn biogel layer and inorganic salt scaling layer. This severe "membrane fouling" causes a rapid decline in membrane permeate flux within a short period. To maintain permeate production, operators must frequently shut down the system for chemical cleaning with high concentrations of acids, alkalis, or sodium hypochlorite. This not only significantly increases chemical and maintenance costs but also accelerates membrane fiber aging and breakage due to frequent chemical corrosion, drastically shortening the lifespan of these expensive membrane modules.

[0005] Traditional equipment processes are lengthy, require large floor space, and consume high energy. Existing leachate treatment systems typically separate functional units such as sedimentation separation, biochemical treatment, and advanced oxidation into independent tanks (e.g., separate equalization tanks, primary sedimentation tanks, anaerobic tanks, and aerobic tanks). This "split-and-container" layout requires a large number of complex pipe networks, valves, and multi-stage pumps connected in series, resulting in a huge land area for the overall equipment and extremely high energy consumption for fluid transport at each pumping stage. With increasingly stringent environmental land use approvals and the growing demand for "in-situ, on-site treatment" from numerous small and medium-sized landfills or waste transfer stations, traditional bulky and cumbersome treatment equipment can no longer meet the market's requirements for miniaturized and highly integrated equipment.

[0006] In summary, there is an urgent need for a novel leachate treatment device that can effectively address recalcitrant organic matter, fundamentally alleviate membrane fouling, and possess a high degree of integration. Summary of the Invention

[0007] The purpose of this invention is to provide a solid waste landfill leachate treatment device to solve the problems of poor biodegradability of aged leachate, easy fouling and clogging of membrane modules, and excessive footprint of traditional equipment in the prior art.

[0008] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A solid waste landfill leachate treatment device includes: an integrated treatment tank, the interior of which is divided by a first partition and a second partition into a cyclone pretreatment chamber, an electrocatalytic oxidation chamber and an ultrasonic membrane bioreactor chamber connected in sequence. The cyclone pretreatment chamber has a tangential inlet pipe on its side wall, and the outlet of the cyclone pretreatment chamber is connected to the electrocatalytic oxidation chamber. The electrocatalytic oxidation chamber is equipped with an electrode assembly, and a sealed gas collection hood is installed at the top of the electrocatalytic oxidation chamber. The upper part of the electrocatalytic oxidation chamber is connected to the ultrasonic membrane bioreactor chamber through an overflow structure. The ultrasonic membrane bioreactor chamber is equipped with a hollow fiber membrane assembly and a permeate suction pump, and a jet aerator and a horn-shaped ultrasonic energy-concentrating hood with an ultrasonic transducer are installed at the bottom. The gas collection hood is connected to the jet aerator through a negative pressure air intake pipe, and an ultraviolet lamp is suspended above the overflow structure.

[0009] Furthermore, the jet aerator's jet end faces upward and is positioned directly below the hollow fiber membrane module; a horn-shaped ultrasonic energy-concentrating hood is coaxially fitted around the jet aerator and is flared upward; several ultrasonic transducers are fixedly mounted in a ring array on the horn-shaped ultrasonic energy-concentrating hood, with the ultrasonic emission surface facing the inner channel of the hood and the hollow fiber membrane module above it.

[0010] Furthermore, a fluid buffer gap is reserved between the top flared end of the horn-shaped ultrasonic energy-concentrating hood and the bottom of the hollow fiber membrane module; the interior of the horn-shaped ultrasonic energy-concentrating hood is defined as a region of intense sonochemical cavitation, and the fluid buffer gap is used to attenuate the physical shock waves generated by cavitation and guide the generated strong oxidizing free radicals and microbubbles to the surface of the hollow fiber membrane module to form a gentle cleaning zone.

[0011] Furthermore, one end of the negative pressure air intake pipe is connected to the gas collection hood, and the other end is connected to the air inlet of the jet aerator; the negative pressure air intake pipe is used to draw in the waste gas generated by electrolysis by using the negative pressure generated by the jet aerator to spray water, and induce sonochemical cavitation reaction by focusing energy bombardment through the ultrasonic transducer.

[0012] Furthermore, the bottom of the cyclone pretreatment chamber has a funnel-shaped contraction structure, and the lowest point is connected to the first sludge discharge valve; the tangential water inlet pipe is horizontally arranged on the upper part of the side wall of the cyclone pretreatment chamber; the outer wall of the funnel-shaped contraction structure is surrounded by a magnetohydrodynamic enhancement array, which includes several electromagnetic coils with staggered polarities, used to apply Lorentz force to the leachate moving with the cyclone to induce magnetic flocculation and sedimentation of suspended particles.

[0013] Furthermore, the overflow structure includes a stepped wave-shaped cascade slope disposed on top of the second partition; the irradiation surface of the ultraviolet lamp tube faces the stepped wave-shaped cascade slope; the stepped wave-shaped cascade slope is used to form a thin film cascade flow state for the overflowing mixture, and to carry out a thin film photo-promoted advanced oxidation reaction in conjunction with the residual oxidant under the irradiation of the ultraviolet lamp tube.

[0014] Furthermore, the bottom sidewall of the ultrasonic membrane bioreactor chamber is connected to a sludge return pipe; a sludge return pump is connected in series on the sludge return pipe, and the other end of the sludge return pipe passes through the second partition and is connected to the lower part of the electrocatalytic oxidation chamber.

[0015] Furthermore, the cyclone pretreatment chamber and the electrocatalytic oxidation chamber are connected by a guide pipe; the water inlet end of the guide pipe is located at the top center of the cyclone pretreatment chamber, and its body extends vertically downward to the bottom of the electrocatalytic oxidation chamber after passing through the first partition.

[0016] Furthermore, the electrode assembly includes several anode plates and several cathode plates vertically and equidistantly interleaved within the electrocatalytic oxidation chamber; a microporous aeration disc is horizontally arranged at the bottom of the electrocatalytic oxidation chamber; both the anode plates and cathode plates are porous mesh structures, and the micropores on adjacent plates are spatially staggered to form a gas-liquid shear grid for multi-stage cutting of rising bubbles.

[0017] Furthermore, the ultrasonic transducer includes a staggered array of high-frequency and low-frequency ultrasonic transducers; a dissolved oxygen sensor is installed at the overflow structure; the dissolved oxygen sensor, the high-frequency ultrasonic transducer, and the low-frequency ultrasonic transducer are all electrically connected to an external PLC control cabinet; the PLC control cabinet has a preset water quality status assessment model, used to calculate the acoustic coupling index based on real-time data fed back from the dissolved oxygen sensor. The calculation formula is as follows:

[0018] in, This represents the real-time dissolved oxygen concentration measured at time t. The preset standard dissolved oxygen concentration reference value, The absolute value of the rate of change of dissolved oxygen concentration per unit time. , , All are preset dimensionless positive weighting coefficients, and It is a natural constant; PLC control cabinet is used for applications based on audio frequency coupling index. To regulate: When ≥ Preset threshold When the activity of the biochemical system is determined to be suppressed, the operating duty cycle of the high-frequency ultrasonic transducer is increased to perform sonochemical advanced oxidation; when <Preset threshold When the activity of the biochemical system is determined to be normal, the duty cycle of the low-frequency ultrasonic transducer is increased to perform physical stripping of the membrane module surface.

[0019] This invention offers the following advantages: By utilizing a pre-positioned electrocatalytic oxidation chamber, the invention breaks down recalcitrant large organic molecules (such as humic acid) in aged leachate into easily absorbed small molecules using strongly oxidizing hydroxyl radicals generated by electrolysis. This significantly improves the biodegradability of the raw water, fundamentally enhancing the treatment efficiency of the biological treatment unit. Furthermore, by installing a horn-shaped ultrasonic energy-concentrating hood around the jet aerator, the invention recovers the upstream electrocatalytic waste gas and induces sonochemical cavitation reactions. Combined with a pre-reserved fluid buffer spacing, the physical shock waves are limited, achieving both powerful chemical degradation and physical scrubbing of the membrane module while significantly extending membrane life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a solid waste landfill leachate treatment device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the cyclone pretreatment chamber structure of a solid waste landfill leachate treatment device according to an embodiment of the present invention.

[0021] Figures 1 to 2 The reference numerals in the attached drawings represent: 1-integrated treatment tank, 11-first baffle, 12-second baffle, 2-cyclone pretreatment chamber, 21-tangential inlet pipe, 22-first sludge discharge valve, 23-guide pipe, 3-electrocatalytic oxidation chamber, 31-anode plate, 32-cathode plate, 33-microporous aeration disc, 34-overflow structure, 4-ultrasonic membrane bioreactor chamber, 41-hollow fiber membrane module, 42-suction pump, 43-ultrasonic transducer, 44-jet aerator, 45-sludge return pipe. Detailed Implementation

[0022] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0023] Example This embodiment provides a solid waste landfill leachate treatment device, as shown in the attached figure. Figure 1 As shown, the integrated treatment tank 1 is divided into three independent chambers connected sequentially from left to right by a vertically arranged first partition 11 and second partition 12, namely the cyclone pretreatment chamber 2, the electrocatalytic oxidation chamber 3, and the ultrasonic membrane bioreactor chamber 4.

[0024] Among them, such as Figure 2 As shown, a tangential inlet pipe 21 is horizontally arranged on the upper part of the side wall of the cyclone pretreatment chamber 2, and the direction of the inlet water flow is tangential to the cylindrical inner wall; the bottom of the chamber has a funnel-shaped contraction structure, and the lowest point is connected to the first sludge discharge valve 22. A magnetohydrodynamic enhancement array (including several electromagnetic coils with alternating polarities) surrounds the outer wall of the funnel-shaped contraction structure. The tangential water inlet forms a high-speed centrifugal cyclone, while the alternating magnetic field penetrates the pipe wall and applies Lorentz force to the charged particles in the water. Under the dual physical force field inducement of centrifugal force and Lorentz force, extremely fine heavy metal complexes and suspended particles undergo "magnetic flocculation" and accelerate their sedimentation to the bottom. The cyclone pretreatment chamber 2 and the electrocatalytic oxidation chamber 3 are connected by a guide pipe 23. The inlet end of the guide pipe 23 is located at the top center of the cyclone pretreatment chamber 2, and the pipe extends vertically downward to the bottom of the electrocatalytic oxidation chamber 3 after passing through the first partition 11. Several anode plates 31 and several cathode plates 32 are vertically and equidistantly inserted into the electrocatalytic oxidation chamber 3. A microporous aeration disc 33 is horizontally installed at the bottom of the chamber (located directly below the electrode plates and connected to an external blower through an air inlet pipe). A sealed gas collection hood is installed at the top of the chamber.

[0025] Both the anode plate 31 and the cathode plate 32 are porous mesh structures, with the micropores on adjacent plates arranged in a spatially staggered manner. When the bubbles released from the microporous aeration disc rise, they are forced to deflect and undergo multi-stage cutting by these staggered micropores, forming a "gas-liquid shear grid." This not only breaks large bubbles into microbubbles but also creates intense three-dimensional turbulence, disrupting the reaction boundary layer on the plate surface, thereby fundamentally preventing scaling and significantly extending the mass transfer residence time.

[0026] The upper part of the electrocatalytic oxidation chamber 3 is connected to the ultrasonic membrane bioreactor chamber 4 through an overflow structure 34. The overflow structure 34 includes a stepped wave-shaped cascade at the top of the second partition 12, and an ultraviolet lamp is suspended directly above the cascade with its irradiation surface facing the cascade.

[0027] When the mixed liquid overflows the cascade, it forms an extremely thin water film with very high light transmittance. Ultraviolet light penetrates the water flow through the film and instantly combines with the intermediate oxidants (such as hydrogen peroxide) remaining in the electrocatalytic process, triggering a photocatalytic advanced oxidation reaction in the film. This process not only traps toxic molecules but also eliminates excess oxidants, protecting the downstream biochemical system.

[0028] The ultrasonic membrane bioreactor chamber 4 houses a hollow fiber membrane module 41 and a permeate suction pump 42. A sludge return pipe 45, connected in series with a sludge return pump, runs along the bottom side wall. This pipe passes through the second partition 12 and connects to the lower part of the electrocatalytic oxidation chamber 3. A jet aerator 44 is located at the bottom of the chamber, with its jet nozzle facing upwards and directly opposite the membrane module. The air inlet of the jet aerator 44 is connected to the aforementioned gas collection hood via a negative pressure air intake pipe. A flared, trumpet-shaped ultrasonic energy-concentrating hood is coaxially fitted around the jet aerator 44, on which staggered arrays of high-frequency and low-frequency ultrasonic transducers are fixedly mounted, with their emitting surfaces facing inwards towards the membrane module above and inside the hood.

[0029] The negative pressure intake pipe uses a jet of water to draw in electrolytic waste gas (oxygen-rich / hydrogen-rich); the horn hood focuses ultrasonic waves to bombard these gases, inducing a strong sonochemical cavitation reaction. Specifically, a fluid buffer gap is left between the top flared end of the horn hood and the bottom of the hollow fiber membrane module 41. This gap confines the intense physical shock waves within the hood, attenuating them and guiding only the generated strong oxidizing free radicals and gentle microbubbles to the membrane surface, achieving dual chemical and physical cleaning with zero mechanical damage.

[0030] A dissolved oxygen sensor is installed at overflow structure 34. This sensor, along with the high / low frequency ultrasonic transducer, is electrically connected to an external PLC control cabinet.

[0031] The PLC control cabinet has a pre-installed water quality assessment model for calculating the acoustic coupling index. :

[0032] in, This represents the real-time dissolved oxygen concentration measured at time t. The preset standard dissolved oxygen concentration reference value, The absolute value of the rate of change of dissolved oxygen concentration per unit time. , , All are preset dimensionless positive weighting coefficients, and is a natural constant; this formula quantifies the oxygen consumption dynamics of microorganisms and is used to guide the automatic switching of ultrasonic frequencies.

[0033] The specific workflow of this invention is as follows: Raw water is injected at high speed into the cyclone pretreatment chamber 2 through the tangential inlet pipe 21. Under the dual synergy of hydraulic centrifugation and magnetohydrodynamic enhancement array (Lorentz force generated by alternating magnetic field), heavy metal complexes and charged particles in the leachate rapidly coagulate and settle, while large sludge particles are periodically discharged through the first sludge discharge valve 22 at the bottom.

[0034] The pretreated, clear supernatant enters the guide pipe 23 from the top center and is directly guided to the bottom of the electrocatalytic oxidation chamber 3. An external blower supplies air to the microporous aeration disc 33. As the bubbles rise, they are continuously cut by the staggered porous anode plate 31 and cathode plate 32, forming a large number of microbubble turbulence. Under the action of a DC electric field, recalcitrant organic macromolecules are violently washed away and their carbon chains are broken by the strong oxidant generated by the electrodes, transforming them into smaller molecules. At the same time, the oxygen-rich / hydrogen-rich waste gas generated by water electrolysis escapes to the water surface and is completely collected by the gas collection hood at the top.

[0035] The mixture, after undergoing electrocatalytic chain breaking, continues to rise, overflowing the stepped, wavy cascade at the top of the second partition 12. At this point, the water flow widens and thins, and the ultraviolet lamps above irradiate at full power. The ultraviolet light and the residual electrolytic oxidants (such as H2O2) in the water instantly undergo photoelectric synergistic advanced oxidation, eliminating residual toxic substances and ensuring that the water flowing into the next stage is non-toxic to microorganisms.

[0036] After detoxification, the mixed liquid rich in small-molecule organic matter enters the ultrasonic membrane bioreactor chamber 4, where it is degraded by high-concentration activated sludge. Finally, the permeate is drawn in by the suction pump 42 through the hollow fiber membrane module 41. During membrane washing and aeration, the jet aerator 44 generates negative pressure by spraying water at high speed, drawing in and breaking up the waste gas in the gas collection hood through the negative pressure air intake pipe. After the waste gas microbubbles enter the trumpet-shaped ultrasonic energy-concentrating hood, they encounter high-frequency bombardment from the ultrasonic transducer, triggering a sonochemical reaction that generates hydroxyl radicals. The intense physical micro-explosions occur within the hood, and after being attenuated by the fluid buffer gap, the gentle air-water mixture carrying free radicals flows directly to the membrane fiber surface, completing a non-damaging in-situ cleaning.

[0037] During operation, dissolved oxygen sensors monitor the water quality entering the biological treatment zone in real time. The PLC control cabinet calculates the acoustic coupling index based on the collected data. . When the quality of the influent water deteriorates ( When the water quality reaches a preset threshold, the system determines that biochemical activity is suppressed. The PLC automatically increases the duty cycle of the high-frequency ultrasonic transducer to enhance anti-toxic degradation through sonochemical advanced oxidation. When the water quality is stable ( When the threshold is less than the preset threshold, the duty cycle of the low-frequency ultrasonic transducer is automatically increased to focus on low-frequency physical vibration to prevent fouling on the membrane surface. At the same time, as the reaction proceeds, the activated sludge at the bottom is continuously pumped back to the lower part of the electrocatalytic oxidation chamber 3 through the sludge return pipe 45 by the return pump to maintain the microbial activity and material balance of the entire system.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A solid waste landfill leachate treatment device, characterized in that, include: An integrated treatment tank (1) is divided into a swirling pretreatment chamber (2), an electrocatalytic oxidation chamber (3), and an ultrasonic membrane bioreactor chamber (4) by a first partition (11) and a second partition (12) connected in sequence. The side wall of the cyclone pretreatment chamber (2) is provided with a tangential water inlet pipe (21), and the water outlet of the cyclone pretreatment chamber (2) is connected to the electrocatalytic oxidation chamber (3); the electrocatalytic oxidation chamber (3) is provided with an electrode assembly, the top of the electrocatalytic oxidation chamber (3) is provided with a sealed gas collection hood, and the upper part of the electrocatalytic oxidation chamber (3) is connected to the ultrasonic membrane bioreactor chamber (4) through an overflow structure (34); the ultrasonic membrane bioreactor chamber (4) is provided with a hollow fiber membrane assembly (41) and a permeate suction pump (42), and the bottom is provided with a jet aerator (44) and a horn-shaped ultrasonic energy-concentrating hood with an ultrasonic transducer (43); the gas collection hood is connected to the jet aerator (44) through a negative pressure air intake pipe, and an ultraviolet lamp is suspended above the overflow structure (34).

2. The solid waste landfill leachate treatment device according to claim 1, characterized in that, The jet aerator (44) has its jet end facing upward and is located directly below the hollow fiber membrane assembly (41); the horn-shaped ultrasonic energy-concentrating hood is coaxially sleeved around the jet aerator (44) and is flared upward; a plurality of ultrasonic transducers (43) are fixedly installed in a ring array on the horn-shaped ultrasonic energy-concentrating hood, and the ultrasonic emission surface faces the inner channel of the hood and the hollow fiber membrane assembly (41) above it.

3. The solid waste landfill leachate treatment device according to claim 2, characterized in that, A fluid buffer gap is reserved between the top flared end of the horn-shaped ultrasonic energy-concentrating cover and the bottom of the hollow fiber membrane assembly (41); the interior of the horn-shaped ultrasonic energy-concentrating cover is defined as a violent sonochemical cavitation zone, and the fluid buffer gap is used to attenuate the physical shock wave generated by cavitation and guide the generated strong oxidizing free radicals and microbubbles to the surface of the hollow fiber membrane assembly (41) to form a gentle cleaning zone.

4. The solid waste landfill leachate treatment device according to claim 2, characterized in that, One end of the negative pressure air intake pipe is connected to the gas collection hood, and the other end is connected to the air inlet of the jet aerator (44). The negative pressure air intake pipe is used to draw in the waste gas generated by electrolysis by the negative pressure generated by the jet aerator (44) spraying water, and induce sonochemical cavitation reaction by the ultrasonic transducer (43) focusing energy bombardment.

5. The solid waste landfill leachate treatment device according to claim 4, characterized in that, The bottom of the cyclone pretreatment chamber (2) has a funnel-shaped contraction structure, and the lowest point is connected to the first sludge discharge valve (22); the tangential water inlet pipe (21) is horizontally arranged on the upper part of the side wall of the cyclone pretreatment chamber (2); the outer wall of the funnel-shaped contraction structure is surrounded by a magnetohydrodynamic enhancement array, which includes several electromagnetic coils with staggered polarities, used to apply Lorentz force to the leachate moving with the cyclone to induce magnetic flocculation and sedimentation of suspended particles.

6. The solid waste landfill leachate treatment device according to claim 1, characterized in that, The overflow structure (34) includes a stepped wave-shaped cascade slope disposed on the top of the second partition (12); the irradiation surface of the ultraviolet lamp tube faces the stepped wave-shaped cascade slope; the stepped wave-shaped cascade slope is used to form a thin film cascade flow state for the overflowing mixed liquid, and to carry out a thin film photo-promoted advanced oxidation reaction in conjunction with the residual oxidant under the irradiation of the ultraviolet lamp tube.

7. The solid waste landfill leachate treatment device according to claim 6, characterized in that, The bottom sidewall of the ultrasonic membrane bioreactor (4) is connected to a sludge return pipe (45); a sludge return pump is connected in series on the sludge return pipe (45), and the other end of the sludge return pipe (45) passes through the second partition (12) and is connected to the lower part of the electrocatalytic oxidation chamber (3).

8. The solid waste landfill leachate treatment device according to claim 1, characterized in that, The swirling pretreatment chamber (2) and the electrocatalytic oxidation chamber (3) are connected by a guide pipe (23); the water inlet of the guide pipe (23) is located at the top center of the swirling pretreatment chamber (2), and its tube extends vertically downward to the bottom of the electrocatalytic oxidation chamber (3) after passing through the first partition (11).

9. The solid waste landfill leachate treatment device according to claim 6, characterized in that, The electrode assembly includes several anode plates (31) and several cathode plates (32) vertically and equidistantly interleaved in the electrocatalytic oxidation chamber (3); a microporous aeration plate (33) is horizontally arranged at the bottom of the electrocatalytic oxidation chamber (3); both the anode plates (31) and the cathode plates (32) are porous mesh structures, and the micropores on adjacent plates are spatially staggered to form a gas-liquid shear grid for multi-stage cutting of rising bubbles.

10. The solid waste landfill leachate treatment device according to claim 1, characterized in that, The ultrasonic transducer (43) includes a high-frequency ultrasonic transducer and a low-frequency ultrasonic transducer arranged in an alternating array; a dissolved oxygen sensor is provided at the overflow structure (34); the dissolved oxygen sensor, the high-frequency ultrasonic transducer, and the low-frequency ultrasonic transducer are all electrically connected to an external PLC control cabinet; the PLC control cabinet has a preset water quality status assessment model, which is used to calculate the acoustic coupling index based on the real-time data fed back by the dissolved oxygen sensor. The calculation formula is as follows: in, This represents the real-time dissolved oxygen concentration measured at time t. The preset standard dissolved oxygen concentration reference value, The absolute value of the rate of change of dissolved oxygen concentration per unit time. , , All are preset dimensionless positive weighting coefficients, and It is a natural constant; The PLC control cabinet is used to base the audio frequency coupling index. To regulate: When ≥ Preset threshold When the activity of the biochemical system is determined to be suppressed, the operating duty cycle of the high-frequency ultrasonic transducer is increased to perform sonochemical advanced oxidation; when <Preset threshold When the activity of the biochemical system is determined to be normal, the operating duty cycle of the low-frequency ultrasonic transducer is increased to perform physical stripping of the membrane module surface.

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