Landfill leachate treatment system without double-membrane method

Abstract

The utility model discloses a landfill leachate treatment system without a double-membrane method, and belongs to the technical field of sewage treatment. Comprising a mesoporous molecular sieve device, a first electrocatalytic oxidation device, an analysis device, a nanofiltration alkali recovery device, an RO device, an electro-Fenton device, a second electrocatalytic oxidation device, an electric flocculation device, a plate-and-frame filter press and a biochemical system, wherein the mesoporous molecular sieve device is used for receiving biochemical effluent, the first electrocatalytic oxidation device is used for receiving sewage subjected to adsorption treatment by the mesoporous molecular sieve device, and the desorption device is used for carrying out desorption regeneration treatment on the sewage subjected to adsorption saturation by the mesoporous molecular sieve device; the nanofiltration alkali recovery device, the RO device, the electro-Fenton device, the second electrocatalytic oxidation device and the electric flocculation device are sequentially communicated through pipelines, and the plate-and-frame filter press and the biochemical system are both connected with the electric flocculation device. The method has the advantages that efficient treatment of the landfill leachate is realized, a double-membrane method and evaporation treatment are not needed after biochemical treatment, and the method is reliable in operation, high in economic benefit, environment-friendly and energy-saving.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to a landfill leachate treatment system without the dual-membrane method. Background Art

[0002] Landfill leachate is the product of the gravity flow of liquid in a landfill. It mainly comes from the water generated during the biochemical degradation of garbage during stacking and landfill processes, such as compaction and fermentation. At the same time, it is a liquid with a high concentration of organic or inorganic components generated under the seepage action of precipitation and groundwater. The water quality of landfill leachate is relatively complex, with high pollutant concentration, high salt content, a COD concentration of 1000 mg / L to 3000 mg / L, an ammonia nitrogen concentration of 1500 mg / L to 3500 mg / L, and a conductivity of 25000 μs / cm to 50000 μs / cm. Therefore, landfill leachate is a high-concentration organic wastewater with complex components. If it is directly discharged into the environment without treatment, it will cause serious environmental pollution. For the purpose of environmental protection, it is essential to treat the leachate. When treating the existing landfill leachate, pretreatment and biochemical treatment are first carried out, and then subsequent treatment is carried out through a biological membrane sewage treatment device. At the same time, evaporation treatment is also required to finally achieve the filtration treatment of harmful impurities in the sewage. As a commonly used advanced treatment technology, the membrane treatment method will produce 30% - 50% of concentrated liquid, and these treated landfill leachate concentrated liquids often need to be recycled to the regulation pond or will produce a large amount of hazardous waste and miscellaneous salts after evaporation, thus causing damage to the environment. Therefore, its practicability is poor, making the current membrane-free method for treating leachate receive more and more research. The Chinese invention patent application with the publication number CN109809638A discloses a membrane-free method and system for treating landfill leachate. The method includes the following steps: performing hydrolysis acidification treatment on the leachate; performing denitrification treatment on the leachate; performing nitrification treatment on the leachate; performing biochemical precipitation treatment on the nitrified leachate; and performing oxidation treatment on the supernatant obtained from the biochemical precipitation treatment to obtain a liquid meeting the discharge standards. The system includes an oil removal unit, a hydrolysis acidification unit, a denitrification unit, a nitrification unit, a biochemical precipitation unit, and an oxidation unit connected in sequence along the leachate flow direction. This patent performs hydrolysis acidification, denitrification, nitrification, biochemical precipitation, and oxidation treatment on the leachate to obtain a liquid meeting the discharge standards. Without using membrane components, it avoids the cumbersome process of membrane washing and replacement; however, its structure is complex, the unit quantity is large, the process residence time is long, the chemical dosage is large, and it also results in high production costs.

[0003] In view of the above situation, it is necessary to reasonably improve and design the structure of the existing landfill leachate treatment system. For this reason, the applicant has made a beneficial design, and the technical solution to be introduced below is generated under this background. Summary of the Utility Model

[0004] The object of the present utility model is to provide a garbage leachate treatment system with a simple structure that can effectively and stably achieve reliable and comprehensive treatment of garbage leachate, and does not require double-membrane method and evaporation treatment after biochemical treatment. At the same time, it effectively solves the problem of a large amount of hazardous waste miscellaneous salts generated after the concentrated solution of garbage leachate is recycled to the regulating pond or evaporated in the original treatment method.

[0005] The object of the present utility model is achieved as follows. A garbage leachate treatment system without the double-membrane method includes: a mesoporous molecular sieve device, a first electrocatalytic oxidation device I, an analysis device, a nanofiltration alkali recovery device, an RO device, an electro-Fenton device, a second electrocatalytic oxidation device II, an electrocoagulation device, a plate and frame filter press, and a biochemical system. Among them, the mesoporous molecular sieve device is used to receive the biochemical effluent, filter the suspended solids and sludge, and adsorb the COD in the water. The first electrocatalytic oxidation device I is used to receive the sewage after being adsorbed and treated by the mesoporous molecular sieve device, and the first electrocatalytic oxidation device I can oxidize the COD in the sewage and remove ammonia nitrogen. The analysis device is connected to the mesoporous molecular sieve device through a pipeline, and the analysis device is used to perform analysis and regeneration treatment on the sewage obtained after the mesoporous molecular sieve device is saturated with adsorption. The nanofiltration alkali recovery device, the RO device, the electro-Fenton device, the second electrocatalytic oxidation device II, and the electrocoagulation device are connected in sequence through pipelines. The plate and frame filter press and the biochemical system are both connected to the electrocoagulation device. The nanofiltration alkali recovery device is connected to the analysis device and is used to recover the alkali solution desorbed by the analysis device. The RO device is used to perform RO concentration treatment on the concentrated solution, clear water, and waste acid obtained by nanofiltration of the nanofiltration alkali recovery device to obtain clear water and concentrated solution. The electro-Fenton device is used to perform electro-Fenton oxidation treatment on the concentrated solution output by the RO device and oxidize and degrade the COD in the concentrated solution to obtain sewage. The second electrocatalytic oxidation device II is used to oxidize the COD in the sewage output by the electro-Fenton device and oxidize the COD in the sewage into gas and water. The electrocoagulation device is used to receive the sewage treated by the second electrocatalytic oxidation device II, and the electrocoagulation device is used to precipitate the suspended solids in the sewage to obtain supernatant and precipitate. The biochemical system is used to receive the supernatant output by the electrocoagulation device and perform biochemical treatment on it, while the plate and frame filter press is used to receive the precipitate output by the electrocoagulation device and perform mud-water separation on it.

[0006] In a specific embodiment of the present utility model, the mesoporous molecular sieve device includes a multi-media filter, a primary adsorption device and a secondary adsorption device which are sequentially connected through pipelines; wherein, the multi-media filter is used to receive the biochemical effluent and filter the suspended matters and sludge in the biochemical effluent, and the liquid inlet end of the primary adsorption device is connected to the liquid outlet end of the multi-media filter through a pipeline, and this primary adsorption device is used to receive the biochemical water treated by the multi-media filter and adsorb the COD in the biochemical water, and the liquid inlet end of the secondary adsorption device is connected to the liquid outlet end of the primary adsorption device through a pipeline, and this secondary adsorption device is used to receive the biochemical water treated by the primary adsorption device and adsorb the COD therein again.

[0007] In another specific embodiment of the present utility model, the first electro-catalytic oxidation device I includes a first electro-catalytic oxidation COD device I and a first electro-catalytic oxidation ammonia nitrogen device I; wherein, the first electro-catalytic oxidation COD device I is also connected to the secondary adsorption device through a pipeline, and this first electro-catalytic oxidation COD device I is used to electrolyze the COD in the biochemical effluent treated by the secondary adsorption device into gas, and the first electro-catalytic oxidation ammonia nitrogen device I is connected to the first electro-catalytic oxidation COD device I through a pipeline, and this first electro-catalytic oxidation ammonia nitrogen device I is used to electrolyze the ammonia nitrogen component in the biochemical effluent treated by the first electro-catalytic oxidation COD device I into nitrogen.

[0008] In yet another specific embodiment of the present utility model, the desorption device is connected to both the primary adsorption device and the secondary adsorption device through pipelines, and this desorption device is electrically connected to a PLC control device, and this PLC control device can control the operation of the desorption device body.

[0009] In still another specific embodiment of the present utility model, the nanofiltration alkali recovery device is filled with a nanofiltration membrane, and this nanofiltration membrane is used to recover the alkali solution generated during the desorption and regeneration process of the desorption device.

[0010] In still another specific embodiment of the present utility model, the RO device is preferably a reverse osmosis membrane device.

[0011] In a further specific embodiment of the present utility model, the electro-Fenton device is preferably a multi-dimensional electro-Fenton device.

[0012] In an even further specific embodiment of the present utility model, the current of the second electro-catalytic oxidation device II is preferably set to direct current of 0 - 30V and 0 - 1000A.

[0013] In yet a further specific embodiment of the present utility model, the electrocoagulation device is preferably a high-frequency pulsed electrocoagulation device.

[0014] In yet another specific embodiment of the present utility model, the plate and frame filter press is preferably a plate and frame diaphragm high-pressure squeezing filter press.

[0015] The beneficial effects of the present utility model are as follows: Through the mesoporous molecular sieve device and the first electrocatalytic oxidation device I, an efficient and reliable sewage treatment effect for the pretreated landfill leachate is achieved. The analytical device can perform analytical regeneration treatment after the mesoporous molecular sieve device is saturated with adsorption. At the same time, the nanofiltration alkali recovery device, RO device, electrofenton device, second electrocatalytic oxidation device II, electrocoagulation device, and plate and frame filter press, together with the biochemical system, can efficiently treat the waste liquid generated during the analytical process, achieving the purpose of energy conservation, environmental protection, and resource recycling, realizing the efficient and environmental protection treatment of landfill leachate, and effectively solving the problem that a large amount of hazardous waste miscellaneous salts are generated after the landfill leachate concentrate is recycled to the regulation tank or evaporated in the existing treatment system; In addition, after biochemical treatment, there is no need to use the dual-membrane method and evaporation treatment, effectively solving the problems of generating miscellaneous salts during the evaporation treatment process or recycling the concentrate to the regulation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] In the figure: 1. Mesoporous molecular sieve device, 11. Multimedia filter, 12. Primary adsorption equipment, 13. Secondary adsorption equipment; 2. First electrocatalytic oxidation device I, 21. First electrocatalytic oxidation COD device I, 22. First electrocatalytic oxidation ammonia nitrogen device I; 3. Analytical device, 31. PLC control equipment; 4. Nanofiltration alkali recovery device; 5. RO device; 6. Electrofenton device; 7. Second electrocatalytic oxidation device II; 8. Electrocoagulation device; 9. Plate and frame filter press; 10. Biochemical system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will be described in detail by way of embodiments, but the descriptions of the embodiments are not limitations on the technical solutions of the present utility model. Any formal but not substantial equivalent transformation made based on the concept of the present utility model should be regarded as falling within the scope of the technical solutions of the present utility model.

[0019] In the following descriptions, all directional or positional concepts such as up, down, left, right, front, and back are based on the current Figure 1 position and state, and thus cannot be understood as special limitations on the technical solutions provided by the present utility model.

[0020] Please refer to Figure 1, which shows a landfill leachate treatment system without the dual-membrane method, including: a mesoporous molecular sieve device 1, a first electrocatalytic oxidation device 2, an analysis device 3, a nanofiltration alkali recovery device 4, an RO device 5, an electro-Fenton device 6, a second electrocatalytic oxidation device II 7, an electrocoagulation device 8, a plate and frame filter press 9, and a biochemical system 10; among them, the aforementioned mesoporous molecular sieve device 1 is used to receive the biochemical effluent and filter the suspended solids and sludge, and adsorb the COD in the water. The aforementioned first electrocatalytic oxidation device 2 is used to receive the sewage after the adsorption treatment by the mesoporous molecular sieve device 1, and the first electrocatalytic oxidation device 2 can perform COD oxidation treatment and ammonia nitrogen removal treatment on the sewage. The aforementioned analysis device 3 is connected to the mesoporous molecular sieve device 1 through a pipeline, and the analysis device 3 is used for desorption and regeneration treatment after the mesoporous molecular sieve device 1 is saturated with adsorption. The aforementioned nanofiltration alkali recovery device 4, RO device 5, electro-Fenton device 6, second electrocatalytic oxidation device II 7, and electrocoagulation device 8 are connected in sequence through pipelines, and the aforementioned plate and frame filter press 9 and biochemical system 10 are both connected to the aforementioned electrocoagulation device 8. The aforementioned nanofiltration alkali recovery device 4 is connected to the aforementioned analysis device 3, and the nanofiltration alkali recovery device 4 is used to recover the alkali solution desorbed by the analysis device 3. The aforementioned RO device 5 is used to perform RO concentration treatment on the concentrated solution, clear water, and waste acid mixed after the nanofiltration alkali recovery device 4 performs nanofiltration to obtain clear water and concentrated solution. The aforementioned electro-Fenton device 6 is used to perform electro-Fenton oxidation treatment on the concentrated solution output by the RO device 5 and oxidize and degrade the COD in the concentrated solution to obtain sewage. The aforementioned second electrocatalytic oxidation device II 7 is used to oxidize the COD in the sewage output by the electro-Fenton device 6 and oxidize the COD in the sewage into gas and water. The aforementioned electrocoagulation device 8 is used to receive the sewage treated by the aforementioned second electrocatalytic oxidation device II 7. The aforementioned electrocoagulation device 8 is used to precipitate the suspended solids in the sewage to obtain supernatant and sediment. The aforementioned biochemical system 10 is used to receive the supernatant output by the aforementioned electrocoagulation device 8 and perform biochemical treatment on it, and the aforementioned plate and frame filter press 9 is used to receive the sediment output by the aforementioned electrocoagulation device 8 and perform mud-water separation on it.

[0021] Furthermore, the mesoporous molecular sieve device 1 described above includes a multi-media filter 11, a primary adsorption device 12, and a secondary adsorption device 13 that are connected in sequence through pipelines. The primary adsorption device 12 and the secondary adsorption device 13 are filled with adsorption materials inside; among them, the multi-media filter 11 is used to receive the biochemical effluent and filter the suspended solids and sludge in the biochemical effluent, thereby effectively ensuring the service life and performance of the adsorption materials inside the primary adsorption device 12 and the secondary adsorption device 13; and the liquid inlet end of the primary adsorption device 12 is connected to the liquid outlet end of the multi-media filter 11 through a pipeline, and the primary adsorption device 12 is used to receive the biochemical water treated by the multi-media filter 11 and adsorb the COD in the biochemical water. The liquid inlet end of the secondary adsorption device 13 is connected to the liquid outlet end of the primary adsorption device 12 through a pipeline. The secondary adsorption device 13 is used to receive the biochemical water treated by the primary adsorption device 12 and adsorb the COD in it again; among them, the primary adsorption device 12 has three tanks, two are in use and one is in standby, and it can operate continuously without stopping. After the previous tank is saturated with adsorption, it is subjected to desorption treatment by the desorption device 3, while the secondary adsorption device 13 is two tanks in parallel, one is in use and the other is in standby, and it can also operate continuously without stopping.

[0022] Please continue to refer to Figure 1 , the first electrocatalytic oxidation device I 2 described above includes a first electrocatalytic oxidation COD device I 21 and a first electrocatalytic oxidation ammonia nitrogen device I 22; among them, the first electrocatalytic oxidation COD device I 21 is also connected to the secondary adsorption device 13 through a pipeline, and the first electrocatalytic oxidation COD device I 21 is used to electrolyze the COD in the biochemical effluent treated by the secondary adsorption device 13 into gas. The current of the first electrocatalytic oxidation COD device I 21 is set to And the first electrocatalytic oxidation ammonia nitrogen device I 22 is connected to the first electrocatalytic oxidation COD device I 21 through a pipeline, and the first electrocatalytic oxidation ammonia nitrogen device I 22 is used to electrolyze the ammonia nitrogen component in the biochemical effluent treated by the first electrocatalytic oxidation COD device I 21 into nitrogen; and, among them, the electrocatalytic oxidation COD device is set with direct current of 0-30V and 0-1000A, and it can electrolyze the COD in the biochemical effluent into gas through specific plates inside to achieve the purpose of efficient treatment; while the first electrocatalytic oxidation ammonia nitrogen device I 22 selects specific plates inside, so as to be able to electrolyze the ammonia nitrogen component in the biochemical effluent into nitrogen to achieve the purpose of removing ammonia nitrogen.

[0023] In this embodiment, the aforementioned analysis device 3 is connected to the aforementioned primary adsorption device 12 and secondary adsorption device 13 through pipelines, and the analysis device 3 is electrically connected to a PLC control device 31, which can control the operation of the analysis device 3 itself; the aforementioned analysis device 3 can perform 4% - 6% caustic solution analysis, 4% - 6% sulfuric acid analysis, and clean water flushing treatment. Among them, the 4% - 6% caustic solution can expand the pore diameter of the mesoporous material inside the primary adsorption device 12 and secondary adsorption device 13, so that COD detaches from the pore diameter of the material and dissolves in the caustic solution, enabling the adsorption material to restore its original performance. The purpose of 4% - 6% sulfuric acid analysis is to adjust the pH value and restore the pore diameter of the expanded mesoporous material to its original shape, and the clean water flushing cleans the residual caustic solution and acid solution in the tank body and the pore diameter of the mesoporous material.

[0024] Furthermore, the aforementioned nanofiltration caustic recovery device 4 is filled with a nanofiltration membrane, and the aforementioned nanofiltration membrane is used to recover the caustic solution generated during the analysis and regeneration process of the analysis device 3, achieving effective utilization of resources, reducing the discharge of waste liquid, and reflecting the advantages of environmental protection and energy conservation.

[0025] Furthermore, the aforementioned RO device 5 is preferably a reverse osmosis membrane device, and the RO device 5 can concentrate the concentrated solution treated by the nanofiltration caustic recovery device 4, thereby reducing the amount of the concentrated solution, reducing the processing volume of subsequent process design, effectively reducing the cost of equipment, and reflecting economic benefits.

[0026] In this embodiment, the aforementioned electro-Fenton device 6 is preferably a multi-dimensional electro-Fenton device, and the electro-Fenton device 6 can oxidize the waste liquid with high-concentration COD output by the RO device 5 and degrade the COD inside it, thereby ensuring the reliability of the treatment.

[0027] Furthermore, the current of the aforementioned second electrocatalytic oxidation device II 7 is preferably set to a direct current of 0 - 30V and 0 - 1000A. The second electrocatalytic oxidation device II 7 can electrolyze the COD in the waste liquid transported by the electro-Fenton device 6 into gas through specific electrode plates inside it, achieving the purpose of further treating COD.

[0028] Furthermore, the aforementioned electrocoagulation device 8 is preferably a high-frequency pulsed electrocoagulation device. The electrocoagulation device 8 can form precipitates of suspended solids in the sewage output by the second electrocatalytic oxidation device II 7 and further remove the suspended solids. At the same time, it can also remove a part of the COD in the sewage. After the electrocoagulation device 8 processes, precipitates and supernatant are generated. The precipitates can be transported to the aforementioned plate and frame filter press 9 for further treatment, and the supernatant will be transported to the aforementioned biochemical system 10 for biochemical treatment.

[0029] In this embodiment, the aforementioned plate and frame filter press 9 is preferably a plate and frame diaphragm high-pressure filter press, and this plate and frame diaphragm high-pressure filter press is preferably any plate and frame high-pressure filter press produced by Hebei Jusheng Filter Press Manufacturing Co., Ltd., Zhucheng Guangyu Environmental Protection Technology Co., Ltd., Liangshan Xinyuda Mechanical Equipment Co., Ltd., Yuzhou Xinchuang Machinery Co., Ltd., Hangzhou Shenfu Filter Press Co., Ltd., Guangzhou Luye Environmental Protection Equipment Co., Ltd., Cangzhou Huakai Hongxiang Mechanical Equipment Co., Ltd., Hebei Ruilong Environmental Protection Equipment Co., Ltd., Henan Shengnuo Machinery Manufacturing Co., Ltd. or Liangshan Jiayi Mechanical Equipment Co., Ltd.; and this plate and frame filter press 9 can separate the sediment generated after the treatment of the electrocoagulation device 8 into mud and water, and form sludge cakes from the sludge.

[0030] Please refer to Figure 1, Briefly describe the working principle of the present utility model: First, perform a sewage treatment process on the effluent after pretreatment and biochemical treatment. The biochemical effluent is first transported to the multi-media filter 11 in the mesoporous molecular sieve device 1 for treatment to remove the suspended solids in the sewage. Then, the sewage flows into the primary adsorption device 12 for adsorption treatment. After primary adsorption, it enters the secondary adsorption device 13 for further adsorption treatment. The sewage treated by the mesoporous molecular sieve device 1 enters the first electrocatalytic oxidation COD device Ⅰ21 in the first electrocatalytic oxidation device Ⅰ2 for COD oxidation treatment to further degrade the COD in the sewage. Then, through the first electrocatalytic oxidation ammonia nitrogen device Ⅰ22, the COD in the sewage undergoes an electrolytic reaction to remove the ammonia nitrogen in the sewage. The sewage with qualified indicators after being treated by the mesoporous molecular sieve device 1 and the first electrocatalytic oxidation device Ⅰ2 can be discharged outwards. And this technical solution can also realize the desorption process. After the mesoporous molecular sieve device 1 is saturated with adsorption, regeneration treatment is carried out: When the adsorption tanks in the primary adsorption device 12 and the secondary adsorption device 13 in the mesoporous molecular sieve device 1 are saturated with adsorption, desorption treatment is required. First, rinse the sewage in the tank with clean water, and then perform desorption treatment with 4% - 6% alkali solution to desorb the adsorbed COD, so that the mesoporous adsorption material restores its original characteristics. After desorption, rinse the alkali solution in the tank with clean water again, and then use 4% - 6% sulfuric acid to adjust the pH value and restore the pore size of the mesoporous material to completely restore the performance of the mesoporous material. Then, treat the waste liquid generated during the desorption process. Use the nanofiltration alkali recovery device 4 to perform nanofiltration recovery treatment on the desorbed alkali solution to recover and store the alkali solution for the next use of the mesoporous material for desorption. The concentrated nanofiltration liquid is mixed with the rinsing clean water and waste acid to adjust the pH to a weakly acidic solution and enter the RO device 5 for RO concentration treatment. The clean water generated by the RO treatment is directly discharged outwards, while the concentrated liquid enters the electro-Fenton device 6 for electro-Fenton oxidation treatment to oxidize and degrade the COD in the concentrated liquid. The concentrated liquid after electro-Fenton treatment enters the second electrocatalytic oxidation device Ⅱ7 to further oxidize the COD therein and oxidize the COD in the concentrated liquid into gas and water to achieve a reliable treatment effect. The sewage treated by the second electrocatalytic oxidation device Ⅱ7 enters the electrocoagulation device 8 for electrocoagulation to precipitate the suspended solids in the sewage and obtain supernatant and precipitate. The supernatant can be transported to the biochemical system 10 for biochemical treatment, and the precipitate can be transported to the plate and frame filter press 9 for sludge-water separation to obtain cake and filtrate. The cake is transported out for treatment, and the filtrate is transported to the biochemical system 10 for further treatment.

[0031] It should be noted that the above embodiments can be freely combined as needed. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

[0032] In summary, the technical solution provided by the present invention makes up for the deficiencies in the existing technology, successfully completes the utility model task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A landfill leachate treatment system without the dual-membrane method, characterized in that, Including: Mesoporous molecular sieve device (1), first electrocatalytic oxidation device I (2), desorption device (3), nanofiltration alkali recovery device (4), RO device (5), electro-Fenton device (6), second electrocatalytic oxidation device II (7), electrocoagulation device (8), plate and frame filter press (9) and biochemical system (10); among them, the mesoporous molecular sieve device (1) is used to receive the biochemical effluent and filter the suspended solids and sludge, and adsorb the COD in the water. The first electrocatalytic oxidation device I (2) is used to receive the sewage after the adsorption treatment by the mesoporous molecular sieve device (1), and this first electrocatalytic oxidation device I (2) can perform COD oxidation treatment and ammonia nitrogen removal treatment on the sewage. The desorption device (3) is connected to the mesoporous molecular sieve device (1) through a pipeline, and this desorption device (3) is used for desorption and regeneration treatment after the mesoporous molecular sieve device (1) is saturated with adsorption. The nanofiltration alkali recovery device (4), RO device (5), electro-Fenton device (6), second electrocatalytic oxidation device II (7) and electrocoagulation device (8) are connected in sequence through pipelines, and the plate and frame filter press (9) and the biochemical system (10) are both connected to the electrocoagulation device (8). The nanofiltration alkali recovery device (4) is connected to the desorption device (3), and this nanofiltration alkali recovery device (4) is used for recovering the alkali solution desorbed by the desorption device (3). The RO device (5) is used to mix the concentrated solution, clear water and waste acid obtained by nanofiltration of the nanofiltration alkali recovery device (4) and perform RO concentration treatment to obtain clear water and concentrated solution. The electro-Fenton device (6) is used to perform electro-Fenton oxidation treatment on the concentrated solution output by the RO device (5) and oxidize and degrade the COD in the concentrated solution to obtain sewage. The second electrocatalytic oxidation device II (7) is used to oxidize the COD in the sewage output by the electro-Fenton device (6) and oxidize the COD of the sewage into gas and water. The electrocoagulation device (8) is used to receive the sewage treated by the second electrocatalytic oxidation device II (7). The electrocoagulation device (8) is used to precipitate the suspended solids in the sewage to obtain supernatant and precipitate. The biochemical system (10) is used to receive the supernatant output by the electrocoagulation device (8) and perform biochemical treatment on it, and the plate and frame filter press (9) is used to receive the precipitate output by the electrocoagulation device (8) and perform mud-water separation on it.

2. The garbage leachate treatment system without the dual-membrane method according to claim 1, characterized in that: The mesoporous molecular sieve device (1) includes a multi-media filter (11), a primary adsorption device (12), and a secondary adsorption device (13) that are sequentially connected through pipelines; wherein, the multi-media filter (11) is used to receive the biochemical effluent and filter the suspended solids and sludge in the biochemical effluent, and the liquid inlet end of the primary adsorption device (12) is connected to the liquid outlet end of the multi-media filter (11) through a pipeline, and this primary adsorption device (12) is used to receive the biochemical water treated by the multi-media filter (11) and adsorb the COD in the biochemical water. The liquid inlet end of the secondary adsorption device (13) is connected to the liquid outlet end of the primary adsorption device (12) through a pipeline, and this secondary adsorption device (13) is used to receive the biochemical water treated by the primary adsorption device (12) and adsorb the COD in it again.

3. The garbage leachate treatment system without the dual-membrane method according to claim 2, wherein: The first electrocatalytic oxidation device I (2) includes a first electrocatalytic oxidation COD device I (21) and a first electrocatalytic oxidation ammonia nitrogen device I (22); wherein, the first electrocatalytic oxidation COD device I (21) is also connected to the secondary adsorption device (13) through a pipeline, and this first electrocatalytic oxidation COD device I (21) is used to electrolyze the COD in the biochemical effluent treated by the secondary adsorption device (13) into gas, and the first electrocatalytic oxidation ammonia nitrogen device I (22) is connected to the first electrocatalytic oxidation COD device I (21) through a pipeline, and this first electrocatalytic oxidation ammonia nitrogen device I (22) is used to electrolyze the ammonia nitrogen component in the biochemical effluent treated by the first electrocatalytic oxidation COD device I (21) into nitrogen.

4. A landfill leachate treatment system without a dual membrane method according to claim 3, characterized in that: The desorption device (3) is connected to both the primary adsorption device (12) and the secondary adsorption device (13) through pipelines, and this desorption device (3) is electrically connected to a PLC control device (31), and this PLC control device (31) can control the operation of the desorption device (3) itself.

5. A landfill leachate treatment system without the dual-membrane method according to claim 1, characterized in that: The nanofiltration alkali recovery device (4) is filled with a nanofiltration membrane, and this nanofiltration membrane is used to recover the alkali solution generated during the desorption and regeneration process of the desorption device (3).

6. A landfill leachate treatment system without the dual-membrane method according to claim 1, characterized in that: The RO device (5) is a reverse osmosis membrane device.

7. A landfill leachate treatment system without a dual-membrane method according to claim 1, characterized in that: The electro-Fenton device (6) is a multi-dimensional electro-Fenton device.

8. A landfill leachate treatment system without the dual-membrane method according to claim 1, characterized in that: The current of the second electrocatalytic oxidation device II (7) is set to direct current of 0 - 30V, 0 - 1000A.

9. A landfill leachate treatment system without the dual-membrane method according to claim 1, characterized in that: The electrocoagulation device (8) is a high-frequency pulsed electrocoagulation device.

10. A landfill leachate treatment system without the dual membrane method according to claim 1, characterized in that: The plate and frame filter press (9) is a plate and frame diaphragm high-pressure pressing machine.

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