A device and method for collecting and treating landfill leachate

Abstract

The present invention discloses a device and method for collecting and treating seepage liquid in a garbage landfill in the technical field of environmental engineering garbage treatment, comprising a landfill, wherein a garbage layer and a seepage liquid collecting device are arranged in the landfill, a tree layer is arranged on the upper part of the landfill, a reinjection treatment device is arranged on the tree layer, a funnel is arranged at the lower part of the landfill, the funnel is connected with a seepage liquid outlet device, the seepage liquid outlet device is connected with the seepage liquid collecting device and the reinjection treatment device, the seepage liquid outlet device is connected with a seepage liquid treatment device, and a control system is arranged outside the landfill; the purpose of the present invention is to provide a device and method for collecting and treating seepage liquid in a garbage landfill, so that the possibility of blockage of a seepage liquid drainage system can be reduced, the off-site treatment amount and harmful substance concentration of the seepage liquid can be reduced, the further treatment of the seepage liquid can be facilitated, and the sludge separation after the leachate treatment is completed can be facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental engineering garbage treatment, and in particular is a device and method for collecting and treating seepage liquid from a garbage landfill. Background Art

[0002] Leachate refers to a high-concentration organic wastewater formed by the moisture contained in the garbage itself in the landfill, rainwater, snow and other moisture that enters the landfill, minus the saturated water holding capacity of the garbage and covering soil layers, and passing through the garbage layer and covering soil layer, as well as water seeping from the accumulated garbage prepared for incineration.

[0003] Most of the landfills in my country are over 40 meters high. As the height of the landfill increases, the pile becomes increasingly compacted, the porosity decreases, and the gradual degradation of the garbage also causes the pile to settle. According to research, the permeability coefficient of the landfill decreases with the increase of the landfill depth, and can reach a minimum of 10-6 cm / s, which is close to an impermeable layer.

[0004] The blockage of the leachate drainage system is the result of the combined effects of physics, biology and chemistry in the landfill. Due to the complex composition of domestic waste in my country, the content of suspended particles in the leachate is relatively high. When the leachate carrying high suspended particles flows through the drainage layer, the suspended particles are intercepted and deposited, the porosity of the drainage layer is reduced, and physical blockage is formed. In particular, when a non-woven protective layer is laid on the upper part of the drainage layer, the suspended particles are efficiently intercepted, quickly blocking the pores of the non-woven structure and depositing on it, and an impermeable layer may be formed within a few months. In addition, uneven settlement of the landfill pile may cause the leachate drainage pipe to deform and twist strongly, further reducing the drainage efficiency. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a landfill leachate collection and treatment device and method, so that it can reduce the possibility of blockage of the leachate drainage system, reduce the off-site treatment volume and harmful substance concentration of the leachate, facilitate the further treatment of the leachate, and facilitate the separation of sludge after the leachate treatment is completed.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A device and method for collecting and treating seepage liquid in a garbage landfill, comprising a landfill, a garbage layer and a seepage liquid collecting device are arranged in the landfill, a tree layer is arranged on the upper part of the landfill, a reinjection treatment device is arranged on the tree layer, a funnel is arranged at the lower part of the landfill, the funnel is connected to a seepage liquid outlet device, the seepage liquid outlet device is connected to the seepage liquid collecting device and the reinjection treatment device, the seepage liquid outlet device is connected to a seepage liquid treatment device, and a control system is arranged outside the landfill;

[0008] The permeate collecting device comprises a plurality of vertical shafts and a plurality of guide plates installed on the garbage layer, one side of the guide plate is connected with a first drainage pipe, the side of the guide plate away from the first drainage pipe is higher than the side of the guide plate close to the first drainage pipe, the first drainage pipe is located outside the garbage layer, a plurality of permeate holes are arranged on the vertical shaft, and the vertical shaft runs through the garbage layer;

[0009] The recharging treatment device includes a liquid return pump, the liquid return pump is located in the vertical shaft, the liquid return pump is connected to a liquid return pipe, one end of the liquid return pipe away from the liquid return pump is connected to a second drainage pipe, a spraying device is installed on the second drainage pipe, and the spraying device is located above the tree layer;

[0010] The permeate outlet device comprises a liquid outlet pipe, a water pump is installed on the liquid outlet pipe, the liquid outlet pipe is connected to the funnel, one end of the first drainage pipe away from the guide plate is connected to the liquid outlet pipe, one end of the liquid outlet pipe away from the funnel is connected to a diversion regulating valve, the diversion regulating valve is connected to the first drainage pipe, and the diversion regulating valve is connected to the second drainage pipe;

[0011] The permeate treatment device includes a pressure oxygen tank and an aerobic tank. The first liquid discharge pipe is connected to the anaerobic tank. A sealing cover is installed on the top of the anaerobic tank. The sealing cover is connected to an exhaust pipe. A stirring device, a heating pipe and a detection panel are installed in the anaerobic tank. A temperature detector and an air pressure sensor are installed on the detection panel.

[0012] A liquid transfer pump is provided between the anaerobic tank and the aerobic tank, and a liquid transfer pipe is connected to the liquid transfer pump. The anaerobic tank and the aerobic tank are connected through the liquid transfer pipe. A partition is provided in the aerobic tank, and a plurality of through holes are provided on the partition. The partition divides the anaerobic tank into a first chamber and a second chamber. A plurality of aeration pipes are installed in the first chamber, and a plurality of aeration holes are provided on the aeration pipes. The aeration pipes are connected to an air pump, and the air pump is located outside the aerobic tank. A pull plate is slidably matched at the lower part of the second chamber, and a mud discharge port is provided at the lower part of the aerobic tank. The pull plate is located on the mud discharge port, and a collection box is provided under the mud discharge port.

[0013] The control system includes a control panel, a display screen and a controller which are electrically connected to each other. The control panel includes a command recognition mechanism, a processor and a command output mechanism. The control panel is electrically connected to a liquid return pump, a water pump, a shunt regulating valve, a temperature detector and an air pressure sensor.

[0014] The following beneficial effects are achieved by adopting the above scheme: first, the control system is located outside the landfill. Unpleasant gases are generated in the daily operation of the landfill, so workers do not need to enter the landfill, which improves the comfort of workers; the parameters are manually set through the control system, such as the recharge treatment time, the temperature and pressure of the anaerobic tank, etc. The control system will control the operation of the device according to the parameters, so that it can control the recharge treatment, anaerobic treatment and aerobic treatment process to obtain purified water;

[0015] As the landfill height increases and the pile body is continuously compacted, because the guide plate is located between the garbage layers, the side of the guide plate away from the first drainage pipe is higher than the side of the guide plate close to the first drainage pipe, so when the garbage layer pile body is continuously compressed, the height position of both sides of the guide plate remains unchanged, and the original permeate produced during the natural fermentation of the garbage layer will be discharged from the first drainage pipe;

[0016] Because the vertical shaft runs through the garbage layer, it plays a supporting role in the garbage layer. When an impermeable layer is formed at the bottom of the garbage pile, the permeate can also flow through the vertical shaft to the permeate outlet device;

[0017] Because the liquid return pump and the liquid return pipe are located in the vertical shaft, and the first drainage pipe is located outside the garbage layer, when the garbage layer pile undergoes uneven settlement, the first drainage pipe will not be affected by the garbage layer pile, and the vertical shaft will protect the liquid return pump and the liquid return pipe, preventing the liquid return pump and the liquid return pipe from being affected by the garbage layer pile, thereby reducing the possibility of blockage caused by damage to the drainage system;

[0018] The original permeate is discharged to the top of the landfill through the reinjection treatment device. The original permeate is sprayed out through the spraying device, which disperses the original permeate and increases the contact area between the original permeate and the landfill surface. Because there is a tree layer on the top of the landfill, the original permeate will be discharged to the top of the landfill. Therefore, after the reinjection of the permeate, on the one hand, the water content of the permeate is reduced by evaporation or absorption by the tree layer, and the amount of off-site treatment of the permeate is reduced, saving energy costs; on the other hand, after the reinjection of the permeate, the permeate will maintain the humidity of the garbage layer, thereby increasing the biological activity and accelerating the decomposition of the garbage.

[0019] Because there is a tree layer on the top of the landfill, when it rains, the trees will absorb rainwater. At the same time, the trees will consolidate the surface soil to reduce the infiltration of rainwater, reduce the water content of the infiltrate and the amount of off-site treatment;

[0020] After the reinjection treatment, the concentration of heavy metals and harmful substances (such as COD, etc.) in the leachate collected by the funnel at the bottom of the landfill will be reduced due to the absorption by the tree layer and the garbage layer, which will facilitate the next step of leachate treatment and benefit the operation of the wastewater treatment system.

[0021] After the original permeate is recharged, the crude permeate will be obtained. The crude permeate is first treated by anaerobic treatment and then by aerobic treatment. The anaerobic treatment consumes the dissolved oxygen in the crude permeate, and the aerobic treatment can replenish the oxygen content of the purified water. The purified water after aerobic treatment is easy to discharge without the need for oxygenation treatment.

[0022] During anaerobic treatment, the stirring device of the anaerobic tank can drive the change of water flow in the anaerobic tank, which is convenient for the contact between anaerobic bacteria and crude permeate, and facilitates the anaerobic treatment; the sealing cover can seal the anaerobic tank, reduce the entry of external air, and facilitate the anaerobic treatment; under anaerobic conditions, anaerobic bacteria will greatly reduce the organic matter content in the crude permeate and convert it into methane gas (which can be used as energy);

[0023] The liquid transfer pump can transfer the liquid in the anaerobic tank to the aerobic tank through the liquid transfer pipe, which is convenient for the liquid transfer between the anaerobic tank and the aerobic tank;

[0024] During aerobic treatment, the air pump will introduce the outside air into the aerobic tank through the aeration pipe, and the air will be discharged from the aeration hole. The air will form a number of bubbles in the water, which will increase the contact area between the air and the water flow, making it easier for aerobic treatment to proceed. Aerobic treatment can effectively reduce BOD5, COD and ammonia nitrogen, and can also remove other pollutants such as iron, manganese and other metals; the original permeate is treated through reinjection treatment, anaerobic treatment and aerobic treatment to reduce the concentration of heavy metals and harmful substances in the original permeate, and purified water is obtained, thus achieving the treatment of the permeate and protecting the natural environment;

[0025] At the same time, the sludge after the leachate treatment is completed can be discharged from the sludge discharge hole, which is convenient for the separation of the sludge after the leachate treatment is completed.

[0026] Furthermore, the upper portion of the guide plate is horizontal, the lower portion of the guide plate is U-shaped, a filter layer is installed on the upper portion of the guide plate, and the first drainage pipe is connected to the bottom of the guide plate.

[0027] The upper part of the guide plate is horizontal and is equipped with a filter layer, which is convenient for collecting and filtering the permeate. The lower part of the guide plate is U-shaped, which is convenient for gathering the permeate collected by the guide plate and introducing it into the first drainage pipe.

[0028] Furthermore, a filter plate is installed at the lower part of the shaft, a funnel-shaped groove is provided under the filter plate, a first solenoid valve is installed at the lower part of the groove, and the first solenoid valve is electrically connected to the control panel.

[0029] The filter plate can filter the permeate in the shaft, the funnel-shaped groove is convenient for collecting the permeate, the first solenoid valve is convenient for controlling the discharge of the permeate from the shaft, and the control panel is convenient for controlling the first solenoid valve.

[0030] Furthermore, a filter layer is installed on the upper part of the funnel, a soil layer is provided on the filter layer, a garbage layer and a vertical shaft are located on the soil layer, a liquid outlet pipe is connected to the lower part of the funnel, a water pump is installed on the liquid outlet pipe, an end of the liquid outlet pipe away from the funnel is connected to a diversion regulating valve, the diversion regulating valve is connected to the first discharge pipe and the second drainage pipe, and the control panel is electrically connected to the water pump.

[0031] The soil layer can coarsely filter the permeate and reduce the content of large impurities in the permeate. The filter layer can further reduce the content of impurities in the permeate. At the same time, the soil layer and the filter layer can reduce the concentration of heavy metals and harmful substances in the permeate. The outlet pipe is convenient for guiding the flow direction of the permeate, the water pump is convenient for providing power for transporting the permeate, the diversion regulating valve is convenient for controlling the flow direction of the water in the outlet pipe, and the control panel is convenient for controlling the operation of the water pump.

[0032] Furthermore, an opening is provided between the spraying device and the second drainage pipe, and the spraying device and the second drainage pipe are connected through the opening. The spraying device includes a shell, a first motor is installed on the shell, a first rotating shaft is provided in the shell, an output shaft of the first motor is fixedly connected to the first rotating shaft, a plurality of first blades are installed on the first rotating shaft, a plurality of spraying ports are provided on both sides of the shell, and the first motor is electrically connected to the control panel.

[0033] The opening is biased towards the second drainage pipe, and the permeate enters the spraying device. The outer shell is convenient for protecting the first rotating shaft and the first blade inside. The first motor can provide power for the first rotating shaft. The first blade can spray the permeate out to increase the contact area between the permeate and the surface of the landfill. The spraying port is convenient for the discharge of the permeate, and the control panel is convenient for controlling the operation of the first motor.

[0034] Furthermore, bolts are provided on the sealing cover, and the sealing cover is installed on the anaerobic tank through the bolts. The stirring device includes a second motor installed on the sealing cover, and the output shaft of the second motor is coaxially fixedly connected with the second rotating shaft, and a plurality of second blades are installed on the second rotating shaft. The second motor is electrically connected to the control panel.

[0035] The bolts facilitate the detachable installation of the sealing cover on the anaerobic tank. The second motor can provide power for the second rotating shaft. The second blades facilitate the change of water flow in the anaerobic tank to increase the contact area between anaerobic bacteria and the permeate. The control panel facilitates the control of the operation of the second motor.

[0036] Furthermore, a gas solenoid valve is installed on the exhaust pipe, a heating pipe is installed on the side wall of the anaerobic tank, and both the gas solenoid valve and the heating pipe are electrically connected to the control panel.

[0037] The gas solenoid valve is convenient for controlling the diameter change of the exhaust pipe; the heating pipe is installed on the side wall of the anaerobic tank, so that the heating pipe can evenly heat the permeate in the anaerobic tank; the control panel is convenient for controlling the operation of the gas solenoid valve and the heating pipe.

[0038] Furthermore, the lower part of the first chamber is connected to a second liquid discharge pipe, a liquid discharge electric control valve is installed on the second liquid discharge pipe, and the liquid discharge electric control valve is electrically connected to the control panel.

[0039] The second liquid discharge pipe is convenient for discharging the liquid in the aerobic tank, the liquid discharge electric control valve is convenient for controlling the diameter change of the second liquid discharge pipe, and the control panel is convenient for controlling the operation of the liquid discharge electric control valve.

[0040] Furthermore, a method for collecting and treating landfill leachate includes the following steps: S1, obtaining raw leachate through natural fermentation of garbage in the landfill; S2, collecting the raw leachate through vertical shafts and guide plates, and then re-injecting the collected raw leachate through a provided pipeline to obtain crude leachate; S3, obtaining purified water through compressed oxygen treatment and aerobic treatment of the crude leachate.

[0041] The original seepage liquid is reinjected into the landfill through reinjection pretreatment, which saves land space on the one hand, and on the other hand, the original seepage liquid will be absorbed by the landfill to reduce the water content, heavy metal concentration and harmful substance concentration of the original seepage liquid; the crude seepage liquid is subjected to compressed oxygen treatment and aerobic treatment to reduce the organic matter content, heavy metal concentration and harmful substance concentration in the crude seepage liquid, increase the oxygen content in the crude seepage liquid, and obtain purified water, thereby realizing the treatment of the seepage liquid and protecting the natural environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The present invention is a flowchart of a device and method for collecting and treating landfill leachate according to an embodiment of the present invention.

[0043] Figure 2 It is a circuit diagram of a device and method for collecting and treating landfill leachate according to an embodiment of the present invention.

[0044] Figure 3 A schematic diagram of a landfill according to an embodiment of the present invention showing a device and method for collecting and treating landfill leachate.

[0045] Figure 4 This is a top view of a landfill according to an embodiment of the present invention, showing a device and method for collecting and treating landfill leachate.

[0046] Figure 5 for Figure 3 Schematic diagram of the guide plate.

[0047] Figure 6 for Figure 3 Schematic diagram of the shaft.

[0048] Figure 7 It is a schematic diagram of a permeate treatment device of a landfill permeate collection and treatment device and method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following is further described in detail through specific implementation methods:

[0050] The reference numerals in the drawings of the specification include: landfill 1, guide plate 2, first drainage pipe 201, filter layer 202, shaft 3, seepage hole 31, garbage layer 4, tree layer 5, liquid return pipe 6, second drainage pipe 61, liquid return pump 62, spraying device 63, first motor 631, first rotating shaft 632, first blade 633, spray port 634, first solenoid valve 64, filter plate 65, filter layer 7, liquid outlet pipe 8, water pump 81 , diversion regulating valve 82, first drain pipe 9, anaerobic tank 10, sealing cover 11, heating pipe 12, partition 13, pull plate 14, mud discharge port 15, collecting box 16, exhaust pipe 17, gas solenoid valve 171, second rotating shaft 18, second blade 19, second motor 20, detection panel 21, liquid transfer pump 22, liquid transfer pipe 221, aeration pipe 23, air pump 24, drain solenoid valve 25, second drain pipe 26, aerobic tank 27.

[0051] The embodiment is basically as shown in the attached Figure 1 As shown: A landfill leachate collection and treatment device and method, comprising a landfill 1, combined with Figure 3 As shown, a garbage layer 4 and a permeate collecting device are provided in the landfill 1, a tree layer 5 is provided on the upper part of the landfill 1, a reinjection treatment device is provided on the tree layer 5, a funnel is provided at the lower part of the landfill 1, a filter layer 202 is installed on the upper part of the funnel, a soil layer is provided on the filter layer 202, the funnel is connected to a permeate outlet device, the permeate outlet device is connected to the permeate collecting device and the reinjection treatment device, the permeate outlet device is connected to the permeate treatment device, and a control system is provided outside the landfill 1;

[0052] Combined with Figure 5 or Figure 6 The permeate collecting device shown comprises a plurality of vertical shafts 3 and a plurality of guide plates 2 installed on a garbage layer 4, wherein the upper portion of the guide plates 2 is horizontal, the lower portion of the guide plates 2 is U-shaped, a filter layer 202 is installed on the upper portion of the guide plates 2, one side of the guide plates 2 is connected to a first drainage pipe 201, the first drainage pipe 201 is connected to the bottom of the guide plates 2, a side of the guide plates 2 away from the first drainage pipe 201 is higher than a side of the guide plates 2 close to the first drainage pipe 201, the first drainage pipe 201 is located outside the garbage layer 4, and the garbage layer 4 and the vertical shafts 3 are located on the soil layer;

[0053] A plurality of penetration holes are arranged on the vertical shaft 3, and the vertical shaft 3 penetrates the garbage layer 4. A filter plate 65 is installed at the lower part of the vertical shaft 3, and a funnel-shaped groove is arranged under the filter plate 65, and a first electromagnetic valve 64 is installed at the lower part of the groove;

[0054] The recharging treatment device includes a liquid return pump 62, which is located in the vertical shaft 3. The liquid return pump 62 is connected to a liquid return pipe 6, and one end of the liquid return pipe 6 away from the liquid return pump 62 is connected to a second drainage pipe 61. A spraying device 63 is installed on the second drainage pipe 61, and the spraying device 63 is located above the tree layer 5;

[0055] The permeate outlet device includes a liquid outlet pipe 8, a water pump 81 is installed on the liquid outlet pipe 8, the liquid outlet pipe 8 is connected to the funnel, the end of the first drainage pipe 201 away from the guide plate 2 is connected to the liquid outlet pipe 8, the end of the liquid outlet pipe 8 away from the funnel is connected to a diversion regulating valve 82, the diversion regulating valve 82 is connected to the first drainage pipe 9, and the diversion regulating valve 82 is connected to the second drainage pipe 61;

[0056] An opening is provided between the spray device 63 and the second drainage pipe 61, and the spray device 63 and the second drainage pipe 61 are connected through the opening. The spray device 63 includes a shell, a first motor 631 is installed on the shell, a first rotating shaft 632 is provided in the shell, an output shaft of the first motor 631 is fixedly connected to the first rotating shaft 632, a plurality of first blades 633 are installed on the first rotating shaft 632, and a plurality of spray ports 634 are provided on both sides of the shell;

[0057] Combined with Figure 7 As shown, the permeate treatment device includes a pressure oxygen tank and an aerobic tank 27, the first liquid discharge pipe 9 is connected to the anaerobic tank 10, a sealing cover 11 is installed on the upper part of the anaerobic tank 10, and bolts are arranged on the sealing cover 11. The sealing cover 11 is installed on the anaerobic tank 10 by bolts;

[0058] The sealing cover 11 is connected to an exhaust pipe 17, and a gas solenoid valve 171 is installed on the exhaust pipe 17;

[0059] The anaerobic tank 10 is provided with a stirring device, a heating tube 12 and a detection panel 21, on which a temperature detector and an air pressure sensor are installed; the stirring device comprises a second motor 20 installed on the sealing cover 11, the output shaft of the second motor 20 is coaxially fixedly connected with a second rotating shaft 18, on which a plurality of second blades 19 are installed, and the heating tube 12 is installed on the side wall of the anaerobic tank 10;

[0060] A liquid transfer pump 22 is provided between the anaerobic tank 10 and the aerobic tank 27. A liquid transfer pipe 221 is connected to the liquid transfer pump 22. The anaerobic tank 10 and the aerobic tank 27 are connected via the liquid transfer pipe 221.

[0061] The aerobic tank 27 is divided by a partition 13, and a plurality of through holes are formed on the partition 13. The partition 13 divides the anaerobic tank 10 into a first chamber and a second chamber. A plurality of aeration pipes 23 are installed in the first chamber, and a plurality of aeration holes are provided on the aeration pipes 23. The aeration pipes 23 are connected to an air pump 24, and the air pump 24 is located outside the aerobic tank 27. The lower part of the first chamber is connected to a second drainage pipe 26, and a drainage electric control valve is installed on the second drainage pipe 26.

[0062] A pull plate 14 is slidably fitted at the lower part of the second chamber, a mud discharge port 15 is provided at the lower part of the aerobic pool 27, the pull plate 14 is located on the mud discharge port 15, and a collection box 16 is provided under the mud discharge port 15;

[0063] Combined with Figure 2 As shown, the control system includes a control panel, a display screen and a controller which are electrically connected to each other. The control panel includes a command recognition mechanism, a processor and a command output mechanism. The control panel is electrically connected to the liquid return pump 62, the shunt regulating valve 82, the temperature detector, the air pressure sensor, the water pump 81, the first solenoid valve 64, the gas solenoid valve 171, the first motor 631, the second motor 20 and the liquid discharge electric control valve.

[0064] The specific implementation process is as follows:

[0065] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, firstly, the parameters are manually set through the controller, such as the recharging treatment time, the temperature and pressure of the anaerobic tank 10, etc., and the display screen (such as a common liquid crystal panel) will display the set parameters. At this time, the electric timer will start timing, and the control panel will close the first solenoid valve 64 through the command output mechanism, start the return liquid pump 62 and the water pump 81, and the control panel will make the permeate in the liquid outlet pipe 8 flow to the second drainage pipe 61 through the shunt regulating valve 82;

[0066] The control system is located outside the landfill 1. Unpleasant odors are generated during daily operation in the landfill 1, so workers do not need to enter the landfill, which improves the comfort of workers.

[0067] During the natural fermentation of the garbage layer, as the landfill height increases and the pile body is continuously compacted, because the guide plate 2 is located between the garbage layers 4, the side of the guide plate 2 away from the first drainage pipe 201 is higher than the side of the guide plate 2 close to the first drainage pipe 201, so when the garbage layer 4 is continuously compressed, the height positions of both sides of the guide plate 2 remain unchanged, and the original permeate generated during the natural fermentation of the garbage layer 4 will be filtered by the filter layer 202 and discharged from the first drainage pipe 201;

[0068] Because the vertical shaft 3 penetrates the garbage layer 4, the vertical shaft 3 plays a supporting role in the garbage layer 4. When an impermeable layer is formed at the bottom of the garbage pile, the permeate can also flow to the permeate outlet device through the vertical shaft 3.

[0069] Because the liquid return pump 62 and the liquid return pipe 6 are located in the vertical shaft 3, the filter layer 202 is provided on the guide plate 2, and the first drainage pipe 201 is located outside the garbage layer 4, when the garbage layer 4 pile body settles unevenly, the first drainage pipe 201 will not be affected by the garbage layer 4 pile body, and the vertical shaft 3 will protect the liquid return pump 62 and the liquid return pipe 6, prevent the liquid return pump 62 and the liquid return pipe 6 from being affected by the garbage layer 4 pile body, and reduce the possibility of damage to the drainage system and blockage;

[0070] Because the first electromagnetic valve 64 is closed, the permeate in the shaft 3 will continue to accumulate, and a part of the permeate will return to the garbage layer 4 through the permeation hole to maintain the humidity of the garbage layer 4, thereby increasing the biological activity and accelerating the decomposition of the garbage, and the other part will be transported to the second drainage pipe 61 through the liquid return pump 62;

[0071] The water pump 81 will transport the permeate that seeps from the first drainage pipe 201 and the landfill 1 to the second drainage pipe 61, and the second drainage pipe 61 will discharge the original permeate to the top of the landfill 1;

[0072] At this time, the control panel will start the first motor 631, the original permeate will flow into the housing of the spray device 63 through the opening, the output shaft of the first motor 631 will drive the first rotating shaft 632 to rotate, the first rotating shaft 632 will drive the first blade 633 to rotate, the first blade 633 will disperse the original permeate, and the original permeate will be discharged through the spray port 634;

[0073] Because the original permeate is sprayed out in a rotating manner, the contact area between the original permeate and the surface of the landfill 1 is increased. Because a tree layer 5 is provided on the upper part of the landfill 1, the original permeate will be discharged above the landfill 1. Therefore, after the permeate is reinjected, on the one hand, it evaporates or is absorbed by the tree layer 5, thereby reducing the water content of the permeate, reducing the amount of off-site treatment of the permeate, and saving energy costs; on the other hand, after the permeate is reinjected, the permeate will maintain the humidity of the garbage layer 4, thereby increasing biological activity and accelerating the decomposition of garbage.

[0074] When it rains, trees absorb rainwater and consolidate the surface soil to reduce rainwater infiltration, thereby reducing the water content of the infiltrate and the amount of off-site treatment.

[0075] After the reinjection treatment, the concentration of heavy metals and harmful substances (such as COD) in the permeate collected by the funnel at the bottom of the landfill 1 will be reduced due to the absorption by the tree layer 5 and the garbage layer 4, which is convenient for the next step of permeate treatment and beneficial to the operation of the wastewater treatment system;

[0076] After a period of recharging, when the time counted by the electric timer reaches a predetermined parameter, the electric timer will send a signal to the control panel, and the command input mechanism of the control panel will receive the signal and send it to the processor (such as a common CPU), and the processor will turn off the first motor 631 and the liquid return pump 62 through the command output mechanism, and the control panel will make the permeate in the liquid outlet pipe 8 flow to the first liquid discharge pipe 9 through the shunt regulating valve 82;

[0077] At this time, the control panel will start the second motor 20, the heating tube 12 and the detection panel 21. The second motor 20 will drive the second rotating shaft 18 to rotate, and the second rotating shaft 18 will drive the second blade 19 to rotate. The second blade 19 will drive the water flow in the anaerobic tank 10 to change, so as to facilitate the contact between the anaerobic bacteria and the crude permeate, and facilitate the anaerobic treatment. The sealing cover 11 can seal the anaerobic tank 10, reduce the entry of external air, and facilitate the anaerobic treatment. The heating tube 12 will heat the permeate in the anaerobic tank 10.

[0078] The detection panel 21 detects the air pressure and temperature data in the anaerobic tank 10, and sends the detected data to the control panel. The control panel controls the heating tube 12 and the gas solenoid valve 171 based on the detection data and the set parameters, so that they can provide a comfortable fermentation condition for the anaerobic bacteria. Under the anaerobic condition, the anaerobic bacteria will greatly reduce the organic matter content in the crude permeate and convert it into methane gas (which can be used as energy);

[0079] After the anaerobic treatment has been carried out for a period of time, according to the change in the air pressure in the anaerobic tank 10, the control panel will start the liquid transfer pump 22, and the liquid transfer pump 22 will transfer the liquid in the anaerobic tank 10 to the aerobic tank 27 through the liquid transfer pipe 221, so as to facilitate the liquid transfer between the anaerobic tank 10 and the aerobic tank 27;

[0080] At this time, the electric control panel will drive the air pump 24, and the air pump 24 will introduce the external air into the aerobic tank 27 through the aeration pipe 23, and the air will be discharged from the aeration hole, and the air will form a number of bubbles in the water, which will increase the contact area between the air and the water flow, and facilitate the aerobic treatment. The aerobic treatment can effectively reduce BOD5, COD and ammonia nitrogen, and can also remove other pollutants such as metals such as iron and manganese; during the aerobic treatment, sludge will be produced, and the sludge will enter the second chamber through the through hole on the partition 13;

[0081] When the aerobic treatment is completed, the control panel will open the drainage solenoid valve 25, and the purified water will be discharged from the second drainage pipe 26. The pull plate 14 will be manually pulled, and the sludge will fall from the sludge discharge port 15 to the collection box 16, which is convenient for the sludge separation after the leachate treatment is completed;

[0082] The crude permeate is first treated anaerobically and then aerobically. The anaerobic treatment consumes the dissolved oxygen in the crude permeate, while the aerobic treatment can replenish the oxygen content of the purified water. The purified water after aerobic treatment is easy to discharge without further oxygenation treatment.

[0083] The original permeate is treated through reinjection, anaerobic and aerobic treatments to reduce the concentration of heavy metals and harmful substances in the original permeate, obtain purified water, realize the treatment of the permeate and protect the natural environment.

[0084] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and / or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A landfill leachate collection and treatment device, characterized in that: The landfill comprises a garbage layer and a permeate collecting device, a tree layer is arranged on the upper part of the landfill, a reinjection treatment device is arranged on the tree layer, a funnel is arranged on the lower part of the landfill, the funnel is connected to a permeate outlet device, the permeate outlet device is connected to the permeate collecting device and the reinjection treatment device, the permeate outlet device is connected to the permeate treatment device, and a control system is arranged outside the landfill; The permeate collection device comprises a plurality of vertical shafts and a plurality of guide plates installed on the garbage layer, one side of the guide plate is connected with a first drainage pipe, the side of the guide plate away from the first drainage pipe is higher than the side of the guide plate close to the first drainage pipe, the first drainage pipe is located outside the garbage layer, a plurality of permeate holes are arranged on the vertical shaft, and the vertical shaft runs through the garbage layer; the upper part of the guide plate is horizontal, the lower part of the guide plate is U-shaped, a filter layer is installed on the upper part of the guide plate, and the first drainage pipe is connected with the bottom of the guide plate; The recharging treatment device includes a liquid return pump, the liquid return pump is located in the vertical shaft, the liquid return pump is connected to a liquid return pipe, one end of the liquid return pipe away from the liquid return pump is connected to a second drainage pipe, a spraying device is installed on the second drainage pipe, and the spraying device is located above the tree layer; The permeate outlet device comprises a liquid outlet pipe, a water pump is installed on the liquid outlet pipe, the liquid outlet pipe is connected to the funnel, one end of the first drainage pipe away from the guide plate is connected to the liquid outlet pipe, one end of the liquid outlet pipe away from the funnel is connected to a diversion regulating valve, the diversion regulating valve is connected to the first drainage pipe, and the diversion regulating valve is connected to the second drainage pipe; The permeate treatment device includes an anaerobic tank and an aerobic tank. The first liquid discharge pipe is connected to the anaerobic tank. A sealing cover is installed on the upper part of the anaerobic tank. The sealing cover is connected to an exhaust pipe. A stirring device, a heating pipe and a detection panel are installed in the anaerobic tank. A temperature detector and an air pressure sensor are installed on the detection panel. A liquid transfer pump is provided between the anaerobic tank and the aerobic tank, and a liquid transfer pipe is connected to the liquid transfer pump. The anaerobic tank and the aerobic tank are connected through the liquid transfer pipe. A partition is provided in the aerobic tank, and a plurality of through holes are provided on the partition. The partition divides the anaerobic tank into a first chamber and a second chamber. A plurality of aeration pipes are installed in the first chamber, and a plurality of aeration holes are provided on the aeration pipes. The aeration pipes are connected to an air pump, and the air pump is located outside the aerobic tank. A pull plate is slidably matched at the lower part of the second chamber, and a mud discharge port is provided at the lower part of the aerobic tank. The pull plate is located on the mud discharge port, and a collection box is provided under the mud discharge port. The control system includes a control panel, a display screen and a controller which are electrically connected to each other. The control panel includes a command recognition mechanism, a processor and a command output mechanism. The control panel is electrically connected to a liquid return pump, a water pump, a shunt regulating valve, a temperature detector and an air pressure sensor.

2. The landfill leachate collection and treatment device according to claim 1, characterized in that: A filter plate is installed at the lower part of the shaft, a funnel-shaped groove is arranged under the filter plate, a first solenoid valve is installed at the lower part of the groove, and the first solenoid valve is electrically connected to the control panel.

3. The landfill leachate collection and treatment device according to claim 1, characterized in that: A filter layer is installed on the upper part of the funnel, a soil layer is arranged on the filter layer, and a garbage layer and a vertical shaft are located on the soil layer.

4. The landfill leachate collection and treatment device according to claim 1, characterized in that: An opening is provided between the spraying device and the second drainage pipe, and the spraying device is connected to the second drainage pipe through the opening. The spraying device includes a shell, a first motor is installed on the shell, a first rotating shaft is provided in the shell, an output shaft of the first motor is coaxially fixedly connected with the first rotating shaft, a plurality of first blades are installed on the first rotating shaft, a plurality of spraying ports are provided on both sides of the shell, and the first motor is electrically connected to the control panel.

5. The landfill leachate collection and treatment device according to claim 1, characterized in that: The sealing cover is provided with bolts, and the sealing cover is installed on the anaerobic tank through the bolts. The stirring device includes a second motor installed on the sealing cover. The output shaft of the second motor is coaxially fixedly connected with the second rotating shaft. A plurality of second blades are installed on the second rotating shaft. The second motor is electrically connected to the control panel.

6. The landfill leachate collection and treatment device according to claim 1, characterized in that: A gas solenoid valve is installed on the exhaust pipe, a heating pipe is installed on the side wall of the anaerobic tank, and both the gas solenoid valve and the heating pipe are electrically connected to the control panel.

7. The landfill leachate collection and treatment device according to claim 1, characterized in that: The lower part of the first chamber is connected with a second liquid discharge pipe, a liquid discharge electric control valve is installed on the second liquid discharge pipe, and the liquid discharge electric control valve is electrically connected to the control panel.

8. The landfill leachate collection and treatment device according to claim 1, characterized in that: A method for collecting and treating landfill leachate comprises the following steps: S1, obtaining raw leachate through natural fermentation of garbage in the landfill; S2, collecting the raw leachate through a vertical shaft and a guide plate, and then recharging the collected raw leachate through a provided pipeline to obtain crude leachate; S3, obtaining purified water through anaerobic treatment and aerobic treatment of the crude leachate.

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