Landfill leachate full-quantitative treatment method and electrocatalytic oxidation device thereof

Abstract

The invention relates to the technical field of landfill leachate treatment, and discloses a landfill leachate full-quantitative treatment method and an electrocatalytic oxidation device thereof.The landfill leachate full-quantitative treatment method comprises the following steps that pretreatment is conducted, and landfill leachate raw water enters a regulating reservoir to be subjected to homogenization and primary hydrolytic acidification; meanwhile, large-particle substances and suspended matters in the landfill leachate are removed; biochemical treatment: the pretreated leachate enters a biochemical system to be subjected to biochemical treatment, so that the leachate is subjected to deamination and dephosphorization, and easy organisms and organic matters are degraded; membrane treatment: enabling the leachate subjected to biochemical treatment to pass through a membrane filtration system so as to intercept organic pollutants and salt in the leachate, and discharging the produced water after the produced water reaches the standard; and concentrated solution treatment: enabling the concentrated solution generated in the membrane filtration system to enter an electrocatalytic oxidation device for electrocatalytic oxidation, then discharging the concentrated solution with the effluent reaching the standard, and enabling the concentrated solution with the effluent not reaching the standard to flow back to the biochemical system to participate in treatment again. According to the invention, the efficiency of landfill leachate treatment can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of landfill leachate treatment, and in particular to a landfill leachate full-quantity treatment method and an electrocatalytic oxidation device thereof. Background Art

[0002] Leachate refers to the sewage formed by leaching of water produced by the decomposition of organic matter in garbage, free water in the garbage, precipitation, and infiltrating groundwater during the landfill and stacking process. When the humidity of the garbage pile exceeds its water holding capacity, the suspended or dissolved organic pollutants and inorganic pollutants such as heavy metals in the garbage pile will dissolve out together, producing leachate.

[0003] Affected by various factors such as the type of landfill material, landfill method, landfill scale, landfill cycle, weather changes, etc., the leachate from domestic waste landfills has the characteristics of large chromaticity, high pollutant concentration and a wide range of variation, many types of organic pollutants, complex water quality, high ammonia nitrogen content, unbalanced nutrient element ratio, and high salt and heavy metal content. It has become one of the important factors that seriously pollute the soil, surface water and groundwater. It must be treated to meet the relevant national and local standards and specifications before it can be discharged into designated receiving water bodies or recycled.

[0004] At present, the treatment of landfill leachate mainly adopts the process of biochemical + membrane method. The membrane treatment process has become the mainstream process for landfill leachate treatment, but membrane treatment will produce about 20%-40% of concentrated liquid. The common way to treat concentrated liquid is to re-inject the concentrated liquid back into the landfill and treat it together with the leachate. However, since the concentrated liquid is enriched with a large amount of salts and trace heavy metals, long-term re-injection will lead to an increasingly prominent problem of salt accumulation, which will have an impact on the leachate treatment biochemical system and the back-end membrane system, making the system recovery rate lower and lower, the treatment capacity smaller and smaller, and the stock of leachate increasing.

[0005] Therefore, the present invention aims to improve the shortcomings of the above-mentioned reinjection and improve the efficiency of landfill leachate treatment. Summary of the invention

[0006] In order to improve the efficiency of landfill leachate treatment, the present application provides a fully quantitative landfill leachate disposal method and an electrocatalytic oxidation device thereof.

[0007] In the first aspect, the present application provides a fully quantitative disposal method for landfill leachate, which adopts the following technical solution: A method for fully quantifying the disposal of landfill leachate comprises the following steps: Pretreatment: the leachate enters the regulating tank for homogenization and preliminary hydrolysis and acidification, while removing large particles and suspended matter in the leachate; Biochemical treatment: the pretreated leachate enters the biochemical system for biochemical treatment, so that the leachate is deammonified and dephosphorized, and the bio- and organic matter are degraded; Membrane treatment: the leachate after biochemical treatment passes through the membrane filtration system to intercept organic pollutants and salts in the leachate, and the produced water is discharged after reaching the standard; Concentrated liquid treatment: the concentrated liquid produced in the membrane filtration system enters the electrocatalytic oxidation device for electrocatalytic oxidation, after which the concentrated liquid that meets the effluent standards is discharged, and the concentrated liquid that does not meet the effluent standards is returned to the biochemical system for re-treatment.

[0008] By adopting the above technical solution, the concentrated liquid produced by the nanofiltration membrane and the reverse osmosis membrane is treated by an electrocatalytic oxidation device, which effectively degrades the organic pollutants and heavy metals in the concentrated liquid, improves the salt accumulation problem, improves the system recovery rate and processing capacity, and reduces the stock of leachate.

[0009] In a second aspect, the present application provides a landfill leachate electrocatalytic oxidation device, which adopts the following technical solution: A device for electrocatalytic oxidation of landfill leachate comprises: an electrocatalytic cell and an electrode assembly; at least one group of the electrode assemblies is arranged in the electrocatalytic cell, and each group of the electrode assemblies comprises a cathode component and an anode component, wherein the cathode component is connected to the negative electrode of a power source, and the anode component is connected to the positive electrode of the power source.

[0010] By adopting the above technical solution, the concentrated liquid is electrocatalytically oxidized through the cooperation of the cathode component and the anode component, so that the organic pollutants and heavy metals in the concentrated liquid are degraded.

[0011] Optionally, the anode component and the cathode component are parallel to each other, an isolation cavity is formed between the anode component and the cathode component, the top end of the anode component has a first connecting hole for connecting to the isolation cavity, and the bottom end of the cathode component has a second connecting hole for connecting to the isolation cavity.

[0012] By adopting the above technical solution, the anode member and the cathode member are parallel to each other, which can improve the uniformity of the electrolytic reaction between the anode member and the cathode member and improve the reaction effect.

[0013] Optionally, when the electrode assembly has multiple groups, the electrode assemblies are distributed along the distribution direction of the anode components and the cathode components.

[0014] By adopting the above technical solution, through the up-and-down arrangement of the first connecting hole and the second connecting hole, and the distribution of multiple groups of electrode assemblies, the concentrated liquid is deflected in the electrocatalytic cell, thereby improving the reaction effect of the concentrated liquid.

[0015] Optionally, it further includes a transfer tank, an interception component, a drain pipe and a return pipe; the interception component is arranged in the transfer tank, and has a first state and a second state, the first state is characterized by the interception component separating the transfer tank into a water inlet chamber and a drain chamber isolated from each other, and the second state is characterized by the interception component connecting the water inlet chamber and the drain chamber to each other; The water inlet chamber is connected to the water outlet end of the electrocatalytic cell, the drain pipe and the reflux pipe are both connected to the water inlet chamber, and both the drain pipe and the reflux pipe are provided with water shut-off valves, the drain pipe is used to discharge the solution that meets the standards, and the reflux pipe is used to discharge the solution that does not meet the standards into the biochemical system.

[0016] By adopting the above technical solution, the transfer tank, interception assembly, drain pipe and reflux pipe are arranged to achieve the management and diversion of the treated concentrated liquid. By isolating the water inlet chamber from the drainage chamber, the solution in the drainage chamber can be detected to determine whether it needs to be discharged or refluxed, and the water inlet chamber continues to receive the inlet liquid from the electrocatalytic cell, so that when the solution in the drainage chamber is discharged, it is not easy to discharge the solution in the water inlet chamber that has not been detected, so that the water quality can be clarified and the accuracy of drainage can be improved.

[0017] Optionally, the shut-off component includes A mobile frame is driven by a driving member to move up and down in the transfer pool; A stirring member having a plurality of stirring members, wherein the plurality of stirring members are distributed along a straight line direction and move on the moving frame; each group of the stirring members comprises a connecting seat, a rotating shaft and stirring blades; the connecting seat moves on the moving frame, the rotating shaft is rotatably connected to the connecting seat, and the stirring blades are distributed on the rotating shaft in an array along the circumferential direction and the axial direction of the rotating shaft; the rotating shafts of the plurality of stirring members are parallel to each other, and the stirring blades of two adjacent stirring members are alternately distributed along the axial direction parallel to the rotating shaft; and A rotation source, mounted on the connecting seat and cooperating with the rotating shaft, for driving the rotating shaft to rotate; The transfer tank has a stable section and a flared section from top to bottom, the stable section has a consistent vertical diameter, and the flared section is connected to the stable section and gradually flares downward; when the interception assembly is in the first state, the movable frame is located in the stable section, the stirring blade is stationary relative to the connecting seat, and the stirring blade fills the gap between two adjacent stirring blades in the adjacent stirring members, and the transfer tank has a gap filling plate in the stable section, and the gap filling plate is used to fill the gap between the stirring blade at the edge and the inner wall of the stable section; When the shut-off assembly is in the second state, the movable frame is located in the flared section, and the distance between the stirring members is increased by the movement of the connecting seat on the movable frame, so that gaps appear between adjacent stirring members; in addition, the rotation source drives the rotating shaft to rotate when the shut-off assembly is in the second state.

[0018] By adopting the above technical scheme, in the first state, the water inlet chamber and the drainage chamber can be isolated by the mutual abutment between the stirring blades, and in the second state, while the solution in the water inlet chamber is discharged into the drainage chamber, the solution can also be stirred by the rotation of the stirring blades to improve the uniformity of the water quality in the drainage chamber, thereby improving the accuracy of detecting the water quality in the drainage chamber.

[0019] Optionally, the width of the stirring blade gradually decreases in a direction away from the rotating axis to which it is connected.

[0020] By adopting the above technical solution, the width of the stirring blades gradually decreases in the direction away from the rotation axis, which is beneficial to reducing the resistance during the stirring process and improving the stirring efficiency. At the same time, when the stirring blades are away from each other in the second state, a gap can be left between the stirring blades to prevent interference during the rotation process.

[0021] Optionally, a guide seat capable of passing through the mobile frame is connected to the connecting seat near the end of the mobile frame, and an elastic member is provided between two adjacent connecting seats, and the elastic member gives the connecting seats a tendency to move away from each other, so that the guide seat is against the inner wall of the transfer pool.

[0022] By adopting the above technical solution, under the drive of the elastic member, when the guide seat is opposite to the flared section, the guide seat can move in the direction of extending the movable frame, thereby increasing the distance between the stirring members under the elastic action of the elastic member.

[0023] Optionally, the transfer pool is provided with a sampling faucet connected to the drainage cavity.

[0024] By adopting the above technical solution, the sampling faucet can facilitate sampling and testing of the solution in the drainage cavity.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. Through a fully quantitative treatment method, including pretreatment, biochemical treatment, membrane treatment and concentrated liquid treatment, this application effectively removes organic pollutants, heavy metals, ammonia nitrogen and other harmful substances in the landfill leachate, so that the effluent meets the discharge standards or recycling requirements. In particular, the application of the electrocatalytic oxidation device in the concentrated liquid treatment step improves the salt accumulation problem caused by the traditional recharge method, improves the system recovery rate and treatment capacity, reduces the stock of leachate, and thus improves the overall treatment efficiency and effect of the landfill leachate; 2. The electrocatalytic oxidation device can generate a large amount of strong oxidants such as hydroxyl radicals through catalysis in a short time, thereby reacting quickly with organic matter and reacting more thoroughly. In the electrocatalytic oxidation process, only electricity is needed, no reagent consumption, no secondary pollution such as sludge is generated, and the reaction can be carried out at normal temperature and pressure. The reaction process is gentle and safe, reducing the processing cost and improving the environmental protection effect.

[0026] 3. The solution after electrocatalytic oxidation enters the transfer tank for chamber isolation to improve the accuracy of solution water quality detection and discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of Embodiment 1 of the present application; Figure 2 It is a structural diagram of Embodiment 2 of the present application; Figure 3 This is a schematic diagram of the structure inside the electrocatalytic cell of Example 2 of the present application; Figure 4 This is a schematic diagram of the structure of the transfer pool in Example 2 of the present application; Figure 5 is a cross-sectional view of the transfer tank in Example 2 of the present application; Figure 6 is a schematic structural diagram of the interception assembly of the second embodiment of the present application when it is in the first state; Figure 7 This is a schematic diagram of the structure of the stirring member of the second embodiment of the present application; Figure 8 is a schematic structural diagram of the shutoff assembly of the second embodiment of the present application when it is in the second state; Fig. 9 yes Figure 8 Cross-section view at AA in the middle.

[0028] Explanation of the reference numerals: 1. electrocatalytic cell; 2. electrode assembly; 201. cathode member; 202. anode member; 3. isolation chamber; 4. first connecting hole; 5. second connecting hole; 6. transfer tank; 7. interception assembly; 71. movable frame; 72. driving member; 73. stirring member; 731. connecting seat; 732. rotating shaft; 733. stirring blade; 74. rotating source; 8. drain pipe; 9. reflux pipe; 10. water inlet chamber; 11. drain chamber; 12. water shut-off valve; 13. stabilizing section; 14. expansion section; 15. gap filling plate; 16. guide seat; 17. elastic member; 18. sampling faucet; 19. liquid inlet; 20. liquid outlet; 21. guide port. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-9 This application is described in further detail.

[0030] Embodiment 1: Please refer to Figure 1 , Figure 1 A schematic flow chart of an embodiment of the fully quantitative disposal method for landfill leachate provided by the present invention.

[0031] In a specific embodiment, a fully quantitative disposal method for landfill leachate includes: S1, pretreatment, the leachate raw water enters the regulating tank for homogenization and preliminary hydrolysis and acidification, and at the same time removes large particles and suspended matter in the leachate. Specifically, homogenization and preliminary hydrolysis and acidification can be achieved through stirring and aeration to improve the efficiency of subsequent biochemical treatment; large particles are removed through physical filtration equipment such as grids and screens, and then suspended matter is removed through chemical agents such as flocculants and coagulants. The main purpose of pretreatment is to reduce the burden of subsequent treatment units and improve treatment efficiency.

[0032] S2, biochemical treatment, the pre-treated leachate enters the biochemical system for biochemical treatment, so that the leachate is deaminated and phosphorus is removed, and the biodegradable organisms and organic matter are degraded. Specifically, the leachate deammonification and phosphorus removal and organic matter degradation can be achieved through the existing two-stage A / O system.

[0033] S3, membrane treatment, the leachate after biochemical treatment passes through the membrane filtration system to intercept the organic pollutants and salts in the leachate, and the produced water is discharged after reaching the standard. Specifically, the membrane filtration system includes an ultrafiltration membrane system, a nanofiltration membrane system and a reverse osmosis membrane system arranged in sequence. Among them, the ultrafiltration membrane system is mainly used to remove large molecular organic matter and suspended matter, the nanofiltration membrane system further removes small molecular organic matter and some inorganic salts, and the reverse osmosis membrane system can remove soluble solids so that the effluent meets the discharge standard.

[0034] S4, concentrated liquid treatment, the concentrated liquid produced in the nanofiltration membrane system and the reverse osmosis membrane system enters the electrocatalytic oxidation device for electrocatalytic oxidation, and then the concentrated liquid that meets the effluent standard is discharged, and the concentrated liquid that does not meet the standard is returned to the biochemical system. The electrocatalytic oxidation device generates a large amount of strong oxidizing substances such as hydroxyl free radicals through electrode reactions, thereby quickly decomposing organic molecules and converting them into harmless carbon dioxide and water, thereby reducing organic matter, ammonia nitrogen and heavy metals in the concentrated liquid, reducing recharge, improving the treatment efficiency of landfill leachate, and extending the service life of the equipment.

[0035] Embodiment 2: Please refer to Figures 2 to 9 , which is the landfill leachate electrocatalytic oxidation device provided by the present invention, is used to electrocatalytically oxidize the concentrated liquid in the concentrated liquid treatment step.

[0036] Reference Figure 2 and Figure 3 In a specific embodiment, the landfill leachate electrocatalytic oxidation device comprises an electrocatalytic cell 1 and an electrode assembly 2. The electrocatalytic cell 1 is in the shape of a square cell, and the two ends of the electrocatalytic cell 1 that are far from each other respectively have a liquid inlet 19 and a liquid outlet 20. The concentrated liquid in the nanofiltration membrane system and the reverse osmosis membrane system enters the electrocatalytic cell 1 through the liquid inlet 19 and leaves from the liquid outlet 20.

[0037] The electrode assembly 2 is located in the electrocatalytic cell 1 and is provided with at least one group. In the present embodiment, multiple groups of electrode assemblies 2 are provided along the distribution direction of the liquid inlet 19 and the liquid outlet 20. Each group of electrode assemblies 2 includes a cathode member 201 and an anode member 202 opposite to each other, and the cathode member 201 and the anode member 202 are both plate-shaped and distributed along the distribution direction of the electrode assembly 2, and the anode member 202 in the same group of electrode assemblies 2 is closer to the liquid inlet 19 than the cathode member 201.

[0038] The opposing cathode member 201, anode member 202 and the inner walls of the two opposing sides of the electrocatalytic cell 1 together enclose an isolation chamber 3. The top array of the anode member 202 is provided with a first connecting hole 4, which connects the isolation chamber 3 with the cavity of the anode member 202 on the side away from the cathode member 201; the bottom array of the cathode member 201 is provided with a second connecting hole 5, which connects the isolation chamber 3 with the cavity of the cathode member 201 on the side away from the anode member 202. Thus, in the process of the concentrated liquid flowing from the liquid inlet 19 to the liquid outlet 20, the concentrated liquid is alternately folded and passes through the anode member 202 and the cathode member 201.

[0039] It should be noted that the anode component 202 is connected to the positive pole of the power supply, and the cathode component 201 is connected to the negative pole of the power supply. When the power is turned on, the anode component 202 produces a large amount of strong oxidizing substances, so that the concentrated liquid can be electrocatalytically oxidized when passing between the anode component 202 and the cathode component 201.

[0040] Reference Figure 2 , Figure 4 and Figure 5 Furthermore, in order to divert the solution after electrocatalytic oxidation, the electrocatalytic oxidation device also includes a transfer tank 6, a cut-off assembly 7, a drain pipe 8 and a reflux pipe 9. The transfer tank 6 is connected to the liquid outlet 20 of the electrocatalytic tank 1 through a pipeline, and the solution in the liquid outlet 20 overflows into the transfer tank 6. The drain pipe 8 and the reflux pipe 9 are both connected to the bottom end of the transfer tank 6, and the drain pipe 8 is connected to the receiving water body to discharge the solution that meets the water quality standards; the reflux pipe 9 is connected to the biochemical system to return the solution that does not meet the water quality standards to the biochemical system. And the water inlet ends of the drain pipe 8 and the reflux pipe 9 are both installed with a water shut-off valve 12 to control the opening and closing of the drain pipe 8 and the reflux pipe 9.

[0041] The interception assembly 7 is installed in the transfer tank 6 and can be moved to a first state and a second state. When the interception assembly 7 is in the first state, the inner cavity of the transfer tank 6 is divided into an inlet cavity 10 and a drain cavity 11 which are isolated from each other. The inlet cavity 10 is located above the drain cavity 11. When the interception assembly 7 is in the second state, the interception assembly 7 forms a gap connecting the inlet cavity 10 and the drain cavity 11. The electrocatalytic cell 1 is connected to the top of the inlet cavity 10, and the drain pipe 8 and the return pipe 9 are both connected to the bottom of the drain cavity 11.

[0042] When the transfer tank 6 is used, the following steps are performed: step 1: the interception component 7 is first in the first state, and the solution in the electrocatalytic cell 1 that has undergone electrocatalytic oxidation continues to enter the water inlet chamber 10; step 2: after accumulating in the water inlet chamber 10 for a period of time, the interception component 7 is adjusted to the second state, so that part of the solution enters the drainage chamber 11, and then the interception component 7 is adjusted back to the first state; step 3: the solution continues to accumulate in the water inlet chamber 10, and the solution in the drainage chamber 11 is discharged from one of the drainage pipe 8 and the return pipe 9 after being tested to determine whether the water quality meets the standard. Then the transfer tank 6 cycles through step 2 and step 3, so that the transfer tank 6 discharges the solution in the drainage chamber 11 as a whole by detecting the water quality of the drainage chamber 11, and does not receive the solution in the water inlet chamber 10 during the discharge process, so it is not easy to mistakenly discharge the substandard solution into the drainage pipe 8.

[0043] The water quality of the solution in the drainage chamber 11 can be detected by placing the probe of a water quality detection instrument (not shown in the figure) into the drainage chamber 11 for detection. A sampling faucet 18 connected to the drainage chamber 11 can also be installed on the transfer tank 6 for sampling detection.

[0044] Reference Figure 5Specifically, the transfer pool 6 has a stable section 13 and an expanded section 14 from top to bottom, and the stable section 13 is in a square frame shape with the same size of the vertical inner cavity cross section. The expanded section 14 is connected to and communicated with the bottom end of the stable section 13, and the expanded section 14 is in an isosceles trapezoidal shape with a hollow interior. The inner cavity cross section of the expanded section 14 and the stable section 13 is consistent with that of the stable section 13, and the inner cavity cross section size of the expanded section 14 gradually increases in the downward direction.

[0045] Reference Figure 5 and Figure 6 , the interception assembly 7 includes a moving frame 71, a driving member 72, a stirring member 73 and a rotating source 74. The moving frame 71 is in the shape of an elongated strip and has two moving frames 71. The two moving frames 71 are located on the same horizontal plane and are parallel to each other. At the same time, the moving frame 71 moves vertically in the transfer pool 6. The driving member 72 is a cylinder installed at the top of the transfer pool 6. The telescopic end of the driving member 72 extends vertically and is connected to the moving frame 71 through a connecting rod, thereby driving the moving frame 71 to move up and down. When the interception assembly 7 is in the first state, the telescopic end of the driving member 72 is in a recovery state, the two moving frames 71 are respectively abutted on the inner walls on both sides of the stable section 13, and the moving frames 71 extend along the edge line of the stable section 13; when the interception assembly 7 is in the second state, the telescopic end of the driving member 72 is in an extended state, and the two moving frames 71 both extend downward to the flaring section 14. There are multiple stirring members 73 evenly spaced along the length direction of the moving frame 71, and the two ends of each stirring member 73 that are far away from each other are respectively matched on the two moving frames 71.

[0046] Reference Figure 6 and Figure 7 Each stirring member 73 includes a connecting seat 731, a rotating shaft 732 and a stirring blade 733. The rotating shaft 732 is in the shape of a shaft roller, and the axial direction of the rotating shaft 732 is perpendicular to the length direction of the moving frame 71. There are two connecting seats 731, and the two connecting seats 731 are respectively rotatably sleeved on the two ends of the rotating shaft 732 that are away from each other, and the two connecting seats 731 are respectively slid in the two moving frames 71 along the length direction of the moving frame 71, so that the rotating shaft 732 can rotate relative to the moving frame 71. The rotating source 74 corresponds to the rotating shaft 732 one by one. The rotating source 74 is a rotating motor that can be used underwater. The rotating source 74 is installed on the connecting seat 731 and the output section is connected to the rotating shaft 732 to drive the rotating shaft 732 to rotate.

[0047] Reference Figure 6 and Figure 7 The stirring blades 733 are fixed on the rotating shaft 732, and the stirring blades 733 are arranged in arrays along the axial direction and the circumferential direction of the rotating shaft 732. Specifically, four groups of stirring blades 733 are evenly spaced along the circumferential direction of the rotating shaft 732. The stirring blades 733 are in the shape of a trapezoidal sheet whose width gradually decreases away from the rotating shaft 732.

[0048] When the intercepting assembly 7 is in the first state, the stirring members 73 are close to each other, the rotating shaft 732 is stationary relative to the connecting seat 731, and the stirring blades 733 on the left and right sides of the rotating shaft 732 extend horizontally, and the stirring blades 733 on the upper and lower sides of the rotating shaft 732 extend vertically. At this time, the stirring blades 733 on the sides close to each other on the two adjacent stirring members 73 are alternately distributed and abut against each other in turn, and one end of the stirring blade 733 away from the rotating shaft 732 connected to itself abuts against the outer wall of the rotating shaft 732 in the adjacent stirring member 73, so that the gap between the two adjacent rotating shafts 732 is blocked by the mutual abutment of the stirring blades 733.

[0049] Reference Figure 5 and Figure 6 The gap-filling plates 15 are fixed on the two opposite inner walls of the stabilizing section 13. The gap-filling plates 15 are fixed on the inner wall of the stabilizing section 13 that does not abut against the moving frame 71. The gap-filling plates 15 are sawtooth-shaped and the teeth face the inner cavity of the stabilizing section 13. When the shut-off assembly 7 is in the first state, the teeth of the gap-filling plates 15 are inserted into the gap between the adjacent stirring blades 733 located at the edge and close to the inner wall of the stabilizing section 13 to fill the gap between the stirring member 73 and the inner wall of the stabilizing section 13. At the same time, the gap-filling plates 15 abut against the moving frame 71 to seal the gap between the gap-filling plates 15 and the moving frame 71.

[0050] Reference Figure 6 and Figure 8 It should be noted that the stirring blade 733 near the moving frame 71 is in a right-angled trapezoidal shape with the right-angled side facing the moving frame 71, so that when the intercepting assembly 7 is in the first state, the stirring blade 733 in a right-angled trapezoidal shape can block the stirring member 73 and the moving frame 71, while the remaining stirring blades 733 are in an isosceles trapezoidal shape. Thus, through the mutual contact between the stirring blades 733, the contact between the stirring blades 733 and the moving frame 71, the contact between the stirring blades 733 and the gap filling plate 15, and the contact between the gap filling plate 15 and the moving frame 71, when the intercepting assembly 7 is in the first state, the stirring member 73, the moving frame 71 and the gap filling plate 15 jointly separate the inner cavity of the transfer tank 6 from top to bottom.

[0051] Reference Figure 5 , Figure 8 and Fig. 9 When the intercepting assembly 7 is in the second state, each stirring member 73 slides on the movable frame 71 through the connecting seat 731, so that each stirring member 73 moves away from each other, so that the distance between the two adjacent rotating shafts 732 becomes larger, so that the stirring blades 733 between the two adjacent stirring members 73 are separated from each other along the length direction of the movable frame 71, so that gaps appear between the stirring blades 733, and because the driving member 72 drives the movable frame 71 to move down to the flared section 14, a gap is naturally formed between the movable frame 71 and the inner wall of the flared section 14, so that the solution can flow from the water inlet chamber 10 into the drainage chamber 11.

[0052] It should be noted that the rotation source 74 is turned on only when the driving member 72 is fully extended to make the interception assembly 7 in the second state, and is in the closed state in other states. The rotation source 74 drives the rotation shaft 732 to rotate, so as to drive the stirring blade 733 to stir the solution, and during the rotation of the stirring blade 733 with the rotation shaft 732, the end of the stirring blade 733 away from the rotation shaft 732 can successively approach the bottom wall of the drainage cavity 11 and the gap filling plate 15, and the gap between the teeth of the gap filling plate 15 can make way for the stirring blade 733 when the stirring blade 733 rotates. The stirring of the solution by the stirring blade 733 can improve the uniformity of the water quality of the solution in the drainage cavity 11 and improve the accuracy of water quality detection.

[0053] Reference Figure 8 Furthermore, in order to make the distance between the stirring members 73 change with the different positions of the intercepting assembly 7, the connecting seats 731 in the two stirring members 73 that are away from each other along the length direction of the moving frame 71 are fixed with guide seats 16, the guide seats 16 extend in the direction extending out of the end of the moving frame 71, and the end of the moving frame 71 is provided with a guide opening 21 for the guide seats 16 to extend out. An elastic member 17 is connected between two adjacent connecting seats 731, and the elastic member 17 is a spring, which gives elastic force to the two connecting seats 731 to move away from each other.

[0054] Reference Figure 5 and Figure 8 , under the elastic force of the elastic member 17, the end of the guide seat 16 away from the connecting seat 731 always abuts against the inner wall of the transfer tank 6. Specifically, when the movable frame 71 is opposite to the stable section 13, the guide seat 16 abuts against the inner wall of the stable section 13 to limit the stirring member 73 connected to the guide seat 16 from moving toward the inner wall of the stable section 13, so that the stirring blade 733 of the stirring member 73 is aligned with the gap filling plate 15, and the stirring blades 733 of adjacent stirring members 73 abut against each other to close the gap. When the movable frame 71 moves downward to be opposite to the flared section 14, due to the increase in the distance between the two inner walls of the flared section 14, the end of the guide seat 16 away from the connecting seat 731 moves out of the movable frame 71 under the push of the elastic member 17 and abuts against the inner wall of the flared section 14, thereby increasing the distance between the stirring members 73 that are away from each other, and the remaining stirring members 73 are evenly expanded under the action of the elastic member 17. When the moving frame 71 moves upward to the stable section 13 again, the guide seat 16 is gradually retracted into the moving frame 71 under the guidance of the inner wall of the expanding section 14, so that the adjacent stirring members 73 return to the state of abutting each other. It should be noted that there is still a certain distance between the lower surface of the gap filling plate 15 and the end of the stable section 13 connected to the expanding section 14, so that the stirring members 73 first abut each other and then abut against the gap filling plate 15.

[0055] In addition, since there are four groups of stirring blades 733 arranged circumferentially along the rotating shaft 732, after one group of stirring blades 733 is used as a water-blocking barrier for a period of time, the number of revolutions of the rotating source 74 can be adjusted so that when the rotating source 74 stops rotating, another group of stirring blades 733 will serve as a water-blocking barrier, thereby increasing the service life of the device.

[0056] The implementation principle of the electrocatalytic oxidation device for leachate in the embodiment of the present application is as follows: the concentrated liquid first passes through the electrocatalytic cell 1, is folded in the electrocatalytic cell 1 for sufficient reaction, and then enters the transfer cell 6; the treated solution is accumulated in the transfer cell 6 before the water inlet chamber 10; when the solution in the drainage chamber 11 is emptied, the intercepting component 7 moves from the first state to the second state and the stirring member 73 rotates, so that the solution in the water inlet chamber 10 enters the drainage chamber 11 while being stirred; after a period of time, the stirring member 73 stops rotating and the intercepting component 7 returns to the first state; the water in the drainage chamber 11 is then tested; if the water quality in the drainage chamber 11 meets the standard, it is discharged from the drainage pipe 8 into the receiving water body; if the water quality in the drainage chamber 11 does not meet the standard, it is discharged from the reflux pipe 9 into the biochemical system for reprocessing.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fully quantitative disposal method for landfill leachate, characterized in that: The following steps are involved: Pretreatment: the leachate enters the regulating tank for homogenization and preliminary hydrolysis and acidification, while removing large particles and suspended matter in the leachate; Biochemical treatment: the pretreated leachate enters the biochemical system for biochemical treatment, so that the leachate is deammonified and dephosphorized, and the bio- and organic matter are degraded; Membrane treatment: the leachate after biochemical treatment passes through the membrane filtration system to intercept organic pollutants and salts in the leachate, and the produced water is discharged after reaching the standard; Concentrated liquid treatment: the concentrated liquid produced in the membrane filtration system enters the electrocatalytic oxidation device for electrocatalytic oxidation, after which the concentrated liquid that meets the effluent standards is discharged, and the concentrated liquid that does not meet the effluent standards is returned to the biochemical system for re-treatment.

2. A landfill leachate electrocatalytic oxidation device, suitable for the concentrated liquid treatment step in claim 1, characterized in that: include: An electrocatalytic cell (1) and an electrode assembly (2); at least one group of the electrode assembly (2) is arranged in the electrocatalytic cell (1), and each group of the electrode assembly (2) comprises a cathode component (201) and an anode component (202), the cathode component (201) being connected to a negative electrode of a power source, and the anode component (202) being connected to a positive electrode of the power source.

3. The electrocatalytic oxidation device for landfill leachate according to claim 2, characterized in that: The anode component (202) and the cathode component (201) are parallel to each other, an isolation cavity (3) is formed between the anode component (202) and the cathode component (201), the top end of the anode component (202) has a first communication hole (4) for connecting to the isolation cavity (3), and the bottom end of the cathode component (201) has a second communication hole (5) for connecting to the isolation cavity (3).

4. The electrocatalytic oxidation device for landfill leachate according to claim 3, characterized in that: When the electrode assembly (2) has multiple groups, the electrode assemblies (2) are distributed along the distribution direction of the anode components (202) and the cathode components (201).

5. The electrocatalytic oxidation device for landfill leachate according to claim 2, characterized in that: It also comprises a transfer tank (6), an intercepting assembly (7), a drainage pipe (8) and a return pipe (9); the intercepting assembly (7) is arranged in the transfer tank (6) and has a first state and a second state, the first state being characterized by the intercepting assembly (7) dividing the transfer tank (6) into a water inlet chamber (10) and a drainage chamber (11) which are isolated from each other, and the second state being characterized by the intercepting assembly (7) connecting the water inlet chamber (10) and the drainage chamber (11) to each other; The water inlet chamber (10) is connected to the water outlet of the electrocatalytic cell (1), the drain pipe (8) and the return pipe (9) are both connected to the water inlet chamber (10), and both the drain pipe (8) and the return pipe (9) are provided with a water shutoff valve (12), the drain pipe (8) is used to discharge a solution that meets the standards, and the return pipe (9) is used to discharge a solution that does not meet the standards into the biochemical system.

6. The electrocatalytic oxidation device for landfill leachate according to claim 5, characterized in that: The shut-off assembly (7) comprises A movable frame (71) is driven by a driving member (72) to move up and down in the transfer pool (6); A stirring member (73) having a plurality of stirring members (73), wherein the plurality of stirring members (73) are distributed along a straight line direction and move on the movable frame (71); each group of the stirring members (73) comprises a connecting seat (731), a rotating shaft (732) and stirring blades (733); the connecting seat (731) moves on the movable frame (71), the rotating shaft (732) is rotatably connected to the connecting seat (731), and the stirring blades (733) are distributed on the rotating shaft (732) in an array along the circumferential direction and the axial direction of the rotating shaft (732); the rotating shafts (732) of the plurality of stirring members (73) are parallel to each other, and the stirring blades (733) of two adjacent stirring members (73) are alternately distributed along the axial direction parallel to the rotating shaft (732); and A rotation source (74), mounted on the connecting seat (731) and cooperating with the rotation shaft (732), and used for driving the rotation shaft (732) to rotate; The transfer tank (6) comprises a stabilizing section (13) and an expanding section (14) from top to bottom, the stabilizing section (13) has a consistent vertical diameter, and the expanding section (14) is connected to the stabilizing section (13) and gradually expands downward; when the intercepting assembly (7) is in the first state, the movable frame (71) is located in the stabilizing section (13), the stirring blade (733) is stationary relative to the connecting seat (731), and the stirring blade (733) fills the gap between two adjacent stirring blades (733) in adjacent stirring members (73), and the transfer tank (6) comprises a gap filling plate (15) in the stabilizing section (13), and the gap filling plate (15) is used to fill the gap between the stirring blade (733) at the edge and the inner wall of the stabilizing section (13); When the shut-off assembly (7) is in the second state, the movable frame (71) is located at the flared section (14), and the distance between the stirring members (73) is increased by the movement of the connecting seat (731) on the movable frame (71), so that gaps appear between adjacent stirring members (73); in addition, the rotation source (74) drives the rotation shaft (732) to rotate when the shut-off assembly (7) is in the second state.

7. The landfill leachate electrocatalytic oxidation device according to claim 6, characterized in that: The width of the stirring blade (733) gradually decreases in a direction away from the rotating shaft (732) to which it is connected.

8. The landfill leachate electrocatalytic oxidation device according to claim 6, characterized in that: A guide seat (16) capable of passing through the mobile frame (71) is connected to the connecting seat (731) near the end of the mobile frame (71), and an elastic member (17) is provided between two adjacent connecting seats (731). The elastic member (17) gives the connecting seats (731) a tendency to move away from each other, so that the guide seat (16) abuts against the inner wall of the transfer pool (6).

9. The landfill leachate electrocatalytic oxidation device according to claim 5, characterized in that: The transfer pool (6) is provided with a sampling faucet (18) which is in communication with the drainage cavity (11).

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