Treatment device for landfill leachate

Abstract

The utility model relates to the technical field of garbage treatment equipment, and provides a treatment device for landfill leachate, the treatment device comprises a sewage tank, a primary sedimentation tank, an adjusting tank, an anaerobic tank, a denitrification tank and a nitration reaction tank which are sequentially arranged along the water flow direction, the primary sedimentation tank is used for precipitating the landfill leachate; the regulating tank is used for carrying out homogeneous regulation on the precipitated leachate; the anaerobic tank is used for carrying out fermentation treatment on the homogenized leachate; the denitrification tank is used for carrying out denitrification treatment on the fermented leachate; the nitration reaction tank is used for degrading the denitrified leachate; the system further comprises a heat exchange pump and a cooling tower, the cooling tower is used for cooling the leachate, and the leachate cooled by the cooling tower flows into the denitrification tank through the heat exchange pump. The device disclosed by the utility model has the effect of conveniently cooling the leachate entering the denitrification tank.

Description

Technical Field

[0001] The present application relates to the technical field of garbage treatment equipment, and in particular to a treatment device for garbage leachate. Background Art

[0002] In the wastewater treatment of waste incineration power plants, the treatment of leachate is currently of general concern. The leachate of waste incineration plants is a kind of high-concentration organic wastewater that is difficult to treat. The leachate is generally dark brown, strongly smelly, and viscous. There are many types of organic matter in the leachate, with complex composition and high toxicity; high organic concentration and wide range of variation; good biodegradability; high ammonia nitrogen content; low pH value and high suspended matter content; high salt content, chloride ion concentration up to thousands of mg / L; contains a variety of heavy metals; water quality and water volume vary greatly, etc.

[0003] The treatment of landfill leachate has also become a major focus of attention in the field of environmental protection. In order to reduce the impact of landfill leachate on the environment, it is generally necessary to use a treatment device to treat the leachate. In the prior art, Chinese invention patent CN200910302960.2 discloses a landfill leachate treatment device, including a primary sedimentation tank and a regulating tank, characterized in that: the primary sedimentation tank is connected to the regulating tank by a pipeline, the regulating tank is connected to the anaerobic reactor, the anaerobic reactor is connected to the denitrification tank, and the denitrification tank is connected to the nitrification tank through a pipeline; the nitrification tank is connected to the ultrafiltration equipment, the ultrafiltration equipment is connected to the nanofiltration equipment; the sludge discharge outlets of the ultrafiltration equipment and the nanofiltration equipment are connected to the sludge thickening tank; the sludge thickening tank is connected to the primary sedimentation tank and the plate and frame filter press.

[0004] Regarding the above-mentioned related technologies, the reaction temperature in the anaerobic reactor is generally in the range of 35-40°C, while the reaction temperature in the denitrification tank is generally in the range of 20-35°C. Although the existing treatment device can achieve the treatment of leachate, the leachate flows directly from the anaerobic reactor to the denitrification tank without cooling the leachate to a certain extent, which affects the treatment effect of the leachate, and therefore needs to be improved. Utility Model Content

[0005] In order to facilitate cooling of the leachate entering the denitrification tank, the present application provides a treatment device for garbage leachate.

[0006] The present application provides a device for treating landfill leachate using the following technical solution:

[0007] A device for treating landfill leachate comprises a sewage pool, a primary sedimentation tank, a regulating tank, an anaerobic tank, a denitrification tank and a nitrification reaction tank which are sequentially arranged along a water flow direction, wherein the sewage pool is used to receive landfill leachate, the primary sedimentation tank is connected to the sewage pool and is used to precipitate the landfill leachate; the regulating tank is connected to the primary sedimentation tank and is used to homogenize and regulate the precipitated leachate; the anaerobic tank is connected to the regulating tank and is used to ferment the homogenized leachate; the denitrification tank is connected to the anaerobic tank and is used to denitrify the fermented leachate; the nitrification reaction tank is connected to the denitrification tank and is used to degrade the denitrified leachate;

[0008] Wherein, it also includes a heat exchange pump and a cooling tower. The output port of the anaerobic tank is connected to the hot inlet of the heat exchange pump, and the heat exchange pump is connected to the cooling tower. The cooling tower is used to cool the leachate. The output port of the cooling tower is connected to the cold inlet of the heat exchange pump. The leachate cooled by the cooling tower flows into the denitrification tank through the heat exchange pump.

[0009] By adopting the above technical solution, the garbage leachate in the sewage pool enters the primary sedimentation tank for sedimentation, and then enters the regulating tank for homogenization and equalization; then enters the anaerobic tank for fermentation treatment to remove most of the organic pollutants. After the anaerobic effluent, the leachate first enters the cooling tower through the heat exchange pump. The cooling tower allows the leachate carrying waste heat to exchange heat with the air inside the tower body, so that the waste heat is transferred to the air and dissipated into the atmosphere, thereby reducing the temperature of the leachate.

[0010] After cooling, the leachate enters the denitrification tank (tank A, also known as the anoxic tank) for reaction. Under anoxic conditions, denitrifying bacteria use the organic carbon in the sewage to reduce nitrate to nitrogen gas, thereby reducing the organic load while denitrifying and replenishing the alkalinity of subsequent nitrification reactions. At the same time, some suspended pollutants are adsorbed and decomposed, thereby improving the biodegradability of the sewage.

[0011] The sewage then enters the nitrification reaction tank (O tank, also known as aerobic tank) through push flow. Under aerobic conditions, the residual organic matter is further degraded. At the same time, nitrifying bacteria oxidize the ammonia nitrogen in the sewage into nitrate nitrogen, which is then returned to the denitrification tank for denitrification and denitrification.

[0012] Preferably, an accident pool is further included, which is located at one side of the regulating pool and connected to the regulating pool, and is used to receive the leachate overflowing from the regulating pool.

[0013] By adopting the above technical solution, the leachate overflowing from the regulating tank can flow into the accident pool for collection, thus preventing the leachate from directly seeping into the earth and reducing the impact on the environment.

[0014] Preferably, the sewage tank, the primary sedimentation tank, the regulating tank and the accident tank are all provided with odor collecting devices, and the odor collecting devices are used to collect odor emitted from the leachate.

[0015] By adopting the above technical solution, since the landfill leachate itself has a strong malodor, odor will also be generated during the treatment process. If it is not treated, it will have an adverse impact on the surrounding atmospheric environment and workers. By adding an odor collection device, the odor emitted during the treatment process can be collected, the spread of odor can be reduced, and the impact of odor on surrounding workers can be reduced.

[0016] Preferably, it further comprises a biogas torch, which is located at one side of the anaerobic tank and connected to the anaerobic tank, and is used for burning the biogas sent out from the anaerobic tank.

[0017] By adopting the above technical solution, biogas will be produced in the anaerobic tank under anaerobic conditions. The biogas is mainly composed of methane, carbon dioxide, nitrogen, hydrogen, oxygen, hydrogen sulfide and other gases, among which the methane content generally accounts for 55~75%, the carbon dioxide content accounts for 25~40%, and other gases account for 5~10%.

[0018] If biogas accumulates in large quantities and is directly discharged, it will emit a foul odor on the one hand, and there will be a risk of fire or explosion on the other hand. By adding a biogas torch, it will automatically ignite when the concentration value reaches 30, and the biogas will be automatically guided and burned through the torch, achieving safety and deodorization functions, and avoiding direct discharge of biogas into the atmosphere.

[0019] Preferably, it also includes an aeration pump and a blower room, wherein the aeration pump is used to connect the nitrification reaction tank and the blower room, and the blower room is used to provide oxygen to the nitrification reaction tank.

[0020] By adopting the above technical solution, since the reaction in the nitrification reaction pool requires the participation of oxygen, sufficient oxygen can increase the efficiency of the nitrification reaction. The blower room passes oxygen into the nitrification reaction pool through an aeration pump, increasing the oxygen supply, promoting biological degradation and water purification, thereby accelerating the speed and efficiency of leachate treatment.

[0021] Preferably, a defoaming pump is further included, which is connected to the nitrification reaction tank and is used to eliminate bubbles and foam in the nitrification reaction tank.

[0022] By adopting the above technical solution, the defoaming pump can eliminate the bubbles and foam generated in the nitrification reaction tank, reduce the influence of the foam on the reaction, and promote the reaction.

[0023] Preferably, it also includes a transport vehicle, a filter and a sludge pool, the transport vehicle is used to transport garbage leachate, the filter is connected to the transport vehicle through a liquid extraction pipe, and the filter is used to filter the leachate; the filter is connected to the sewage pool and the sludge pool at the same time, the clear liquid filtered by the filter flows to the sewage pool, and the sludge filtered by the filter is transported to the sludge pool.

[0024] By adopting the above technical solution, the filter filters the leachate on the transport vehicle, and the filtered leachate is transported to the sewage pool through the pipeline for treatment. The filtered sludge is transported to the sludge pool for subsequent centralized dehydration treatment.

[0025] Preferably, it also includes an ultrafiltration system and an ultrafiltration water production pool, the ultrafiltration system is connected to the nitrification reaction pool and is used to ultrafilter the leachate, the ultrafiltration water production pool is connected to the output end of the ultrafiltration system, and the ultrafiltration water production pool is used to receive the ultrafiltration concentrate formed by the ultrafiltration system.

[0026] By adopting the above technical solution, the ultrafiltration system performs ultrafiltration treatment on the leachate after the nitrification reaction to obtain an ultrafiltration concentrate, which is then transported to the ultrafiltration water production pool to be collected for subsequent treatment.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] (1) By setting up a heat exchange pump and a cooling tower, the cooling tower can allow the leachate carrying waste heat to exchange heat with the air inside the tower body, so that the waste heat is transferred to the air and dissipated into the atmosphere, thereby reducing the temperature of the leachate. After cooling, the leachate enters the denitrification tank through the heat exchange pump for reaction.

[0029] (2) By setting up an odor collection device, the odor collection device can collect the odor emitted during the treatment process and reduce the spread of the odor.

[0030] (3) By setting up a defoaming pump, the defoaming pump can eliminate the bubbles and foam generated in the nitrification reaction tank and reduce the impact of foam on the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the processing device in the embodiment of the present application.

[0032] Figure numerals: 1. sewage pool; 2. primary sedimentation tank; 3. regulating tank; 4. anaerobic tank; 5. heat exchange pump; 6. cooling tower; 7. denitrification tank; 8. nitrification reaction tank; 9. ultrafiltration system; 10. ultrafiltration water production tank; 11. biogas torch; 12. defoaming pump; 13. blower room; 14. aeration pump; 15. accident pool; 16. odor collection device; 17. transport vehicle; 18. filter; 19. sludge tank; 20. liquid extraction pipe. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The present application can be embodied in many different forms and is not limited to the embodiments described here.

[0034] In the description of the present application, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics represented can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection; it can also be a detachable connection; or integrated; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples shown in the present application.

[0038] The present application embodiment discloses a device for treating landfill leachate. Figure 1The treatment device includes a sewage pool 1, a primary sedimentation tank 2, a regulating tank 3, an anaerobic tank 4, a heat exchange pump 5, a cooling tower 6, a denitrification tank 7, a nitrification reaction tank 8, an ultrafiltration system 9 and an ultrafiltration water production tank 10, which are arranged in sequence along the water flow direction. The sewage pool 1 is used to receive the landfill leachate, the primary sedimentation tank 2 is connected to the sewage pool 1, and is used to precipitate the landfill leachate. The regulating tank 3 is connected to the primary sedimentation tank 2, and is used to homogenize and regulate the leachate after precipitation.

[0039] The anaerobic tank 4 is connected to the regulating tank 3 and is used to ferment the homogenized leachate. Under anaerobic conditions, biogas is produced in the anaerobic tank 4. The biogas is mainly composed of methane, carbon dioxide, nitrogen, hydrogen, oxygen, hydrogen sulfide and other gases, wherein the content of methane generally accounts for 55-75%, the content of carbon dioxide accounts for 25-40%, and other gases account for 5-10%. Among them, a biogas torch 11 is also installed on one side of the anaerobic tank 4, and the biogas torch 11 is connected to the anaerobic tank 4. The biogas torch 11 is used to burn the biogas sent out by the anaerobic tank 4. By adding the biogas torch 11, it is automatically ignited when the concentration value reaches a certain value, and the biogas is automatically guided and burned by the torch to achieve safety and deodorization functions, avoiding direct discharge of biogas into the atmosphere, and reducing the generation of odor and fire. The output port of the anaerobic tank 4 is connected to the hot inlet of the heat exchange pump 5, and the hot outlet of the heat exchange pump 5 is connected to the input port of the cooling tower 6, and the cooling tower 6 is used to cool the leachate. The output port of the cooling tower 6 is connected to the cold inlet port of the heat exchange pump 5 , and the leachate cooled by the cooling tower 6 flows into the denitrification tank 7 through the heat exchange pump 5 .

[0040] The denitrification tank 7 is used for denitrification of the leachate after fermentation, and the nitrification reaction tank 8 is connected to the denitrification tank 7 and is used to degrade the leachate after denitrification. Among them, a defoaming pump 12 is also installed on the nitrification reaction tank 8, and the defoaming pump 12 is used to eliminate bubbles and foams in the nitrification reaction tank 8, reduce the influence of foam on the nitrification reaction, and promote the reaction. In some embodiments, a blower room 13 is also installed on one side of the nitrification reaction tank 8, and the nitrification reaction tank 8 and the blower room 13 are connected through an aeration pump 14. The blower room 13 is used to provide oxygen to the nitrification reaction tank 8, and oxygen is transported to the nitrification reaction tank 8 through the aeration pump 14. Since the reaction in the nitrification reaction tank 8 requires the participation of oxygen, sufficient oxygen can increase the efficiency of the nitrification reaction. The blower room 13 passes oxygen into the nitrification reaction tank 8 through the aeration pump 14, increases the oxygen supply, promotes the degradation of organisms and the purification of water, thereby accelerating the speed and efficiency of leachate treatment. The ultrafiltration system 9 is connected to the nitrification reaction tank 8 and is used to perform ultrafiltration treatment on the filtrate. The ultrafiltration water production tank 10 is connected to the output end of the ultrafiltration system 9 and is used to collect the ultrafiltration concentrate formed by the ultrafiltration system 9.

[0041] During treatment, the garbage leachate in the sewage pool 1 enters the primary sedimentation tank 2 for sedimentation, and then enters the regulating tank 3 for homogenization and equalization; then enters the anaerobic tank 4 for fermentation treatment to remove most of the organic pollutants. After anaerobic effluent, the leachate first enters the cooling tower 6 through the heat exchange pump 5. The cooling tower 6 allows the leachate carrying waste heat to exchange heat with the air inside the tower body, so that the waste heat is transferred to the air and dissipated into the atmosphere, thereby reducing the temperature of the leachate.

[0042] After being cooled, the leachate enters the denitrification tank 7 (tank A, also known as the anoxic tank) for reaction. Under anoxic conditions, denitrifying bacteria use the organic carbon in the sewage to reduce nitrate to nitrogen gas, which reduces the organic load while removing nitrogen and replenishes the alkalinity of the subsequent nitrification reaction. At the same time, some suspended pollutants are adsorbed and decomposed, which improves the biodegradability of the sewage.

[0043] Then the sewage enters the nitrification reaction tank 8 (O tank, also known as aerobic tank) through push flow. Under aerobic conditions, the residual organic matter is further degraded, and at the same time, the nitrifying bacteria oxidize the ammonia nitrogen in the sewage into nitrate nitrogen, which is then conveniently returned to the denitrification tank 7 for denitrification and denitrification. The ultrafiltration system 9 performs ultrafiltration treatment on the leachate after the nitrification reaction to obtain an ultrafiltration concentrate, which is then transported to the ultrafiltration water production tank 10 to complete the collection for subsequent treatment.

[0044] Specifically, an accident pool 15 is installed on one side of the regulating pool 3, and the accident pool 15 is connected to the regulating pool 3. The accident pool 15 is used to receive the leachate overflowing from the regulating pool 3 to prevent the leachate from directly infiltrating into the earth and reducing the impact on the environment. In this embodiment, an odor collection device 16 is installed on the sewage pool 1, the primary sedimentation tank 2, the regulating pool 3 and the accident pool 15. The odor collection device 16 is used to collect the odor emitted from the leachate, reduce the spread of the odor, and reduce the impact of the odor on the surrounding workers.

[0045] In addition, the treatment device also includes a transport vehicle 17, a filter 18 and a sludge pool 19. The transport vehicle 17 is used to transport the garbage leachate, and the filter 18 is connected to the transport vehicle 17 through a liquid extraction pipe 20, and the liquid extraction pipe 20 is used to transport the leachate on the transport vehicle 17 to the filter 18, and the filter 18 is used to filter the leachate. Among them, the filter 18 is connected to the sewage pool 1 and the sludge pool 19 at the same time; the clear liquid filtered by the filter 18 flows through the pipeline to the sewage pool 1 to wait for treatment, and the sludge filtered by the filter 18 is transported to the sludge pool 19 through the pipeline, so that the sludge can be subsequently dehydrated.

[0046] The implementation principle of the treatment device for garbage leachate in the embodiment of the present application is as follows: during treatment, the garbage leachate in the sewage pool 1 enters the primary sedimentation tank 2 for sedimentation, and after sedimentation enters the regulating tank 3 for homogenization and equalization; then enters the anaerobic tank 4 for fermentation treatment to remove most of the organic pollutants. After anaerobic effluent, the leachate first enters the cooling tower 6 through the heat exchange pump 5. The cooling tower 6 allows the leachate carrying waste heat to exchange heat with the air inside the tower body, so that the waste heat is transferred to the air and dissipated into the atmosphere, thereby reducing the temperature of the leachate.

[0047] After cooling, the leachate enters the denitrification tank 7 for reaction. Under anoxic conditions, denitrifying bacteria use organic carbon in the sewage to reduce nitrate to nitrogen. Then the sewage enters the nitrification reaction tank 8 through plug flow, and the residual organic matter is further degraded under aerobic conditions. Finally, the ultrafiltration system 9 performs ultrafiltration treatment on the leachate after nitrification reaction to obtain ultrafiltration concentrate.

[0048] 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 device for treating landfill leachate, characterized in that: The invention comprises a sewage pool (1), a primary sedimentation tank (2), a regulating tank (3), an anaerobic tank (4), a denitrification tank (7) and a nitrification reaction tank (8) which are arranged in sequence along the water flow direction, wherein the sewage pool (1) is used to receive garbage leachate, the primary sedimentation tank (2) is connected to the sewage pool (1) and is used to precipitate the garbage leachate; the regulating tank (3) is connected to the primary sedimentation tank (2) and is used to homogenize and regulate the leachate after precipitation; the anaerobic tank (4) is connected to the regulating tank (3) and is used to ferment the homogenized leachate; the denitrification tank (7) is connected to the anaerobic tank (4) and is used to denitrify the leachate after fermentation; and the nitrification reaction tank (8) is connected to the denitrification tank (7) and is used to degrade the leachate after denitrification; The anaerobic tank (4) further comprises a heat exchange pump (5) and a cooling tower (6); the output port of the anaerobic tank (4) is connected to the hot inlet port of the heat exchange pump (5); the heat exchange pump (5) is connected to the cooling tower (6); the cooling tower (6) is used to cool the leachate; the output port of the cooling tower (6) is connected to the cold inlet port of the heat exchange pump (5); the leachate cooled by the cooling tower (6) flows into the denitrification tank (7) through the heat exchange pump (5).

2. The device for treating landfill leachate according to claim 1, characterized in that: It also comprises an accident pool (15), the accident pool (15) being located on one side of the regulating pool (3) and connected to the regulating pool (3), the accident pool (15) being used to receive the leachate overflowing from the regulating pool (3).

3. The device for treating landfill leachate according to claim 2, characterized in that: The sewage tank (1), the primary sedimentation tank (2), the regulating tank (3) and the accident tank (15) are all provided with an odor collecting device (16), and the odor collecting device (16) is used to collect odor emitted from the leachate.

4. The device for treating landfill leachate according to claim 1, characterized in that: It also comprises a biogas torch (11), which is located on one side of the anaerobic tank (4) and connected to the anaerobic tank (4), and is used to burn the biogas sent out from the anaerobic tank (4).

5. The device for treating landfill leachate according to claim 1, characterized in that: It also includes an aeration pump (14) and a blower room (13), wherein the aeration pump (14) is used to connect the nitrification reaction pool (8) and the blower room (13), and the blower room (13) is used to provide oxygen to the nitrification reaction pool (8).

6. The device for treating landfill leachate according to claim 1, characterized in that: It also comprises a defoaming pump (12), which is connected to the nitrification reaction pool (8) and is used to eliminate bubbles and foam in the nitrification reaction pool (8).

7. The device for treating landfill leachate according to claim 1, characterized in that: It also comprises a transport vehicle (17), a filter (18) and a sludge pool (19); the transport vehicle (17) is used to transport landfill leachate; the filter (18) is connected to the transport vehicle (17) via a liquid extraction pipe (20); the filter (18) is used to filter the leachate; the filter (18) is connected to the sewage pool (1) and the sludge pool (19) at the same time; the clear liquid filtered by the filter (18) flows to the sewage pool (1), and the sludge filtered by the filter (18) is transported to the sludge pool (19).

8. The device for treating landfill leachate according to claim 1, characterized in that: It also includes an ultrafiltration system (9) and an ultrafiltration water production pool (10), wherein the ultrafiltration system (9) is connected to the nitrification reaction pool (8) and is used to perform ultrafiltration treatment on the leachate, and the ultrafiltration water production pool (10) is connected to the output end of the ultrafiltration system (9), and the ultrafiltration water production pool (10) is used to receive the ultrafiltration concentrate formed by the ultrafiltration system (9).

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