Treatment system for refuse landfill

Abstract

The utility model provides a treatment system for a refuse landfill, which comprises a plurality of repair wells and a plurality of extraction wells arranged on the refuse landfill, and an aerobic aeration, liquid phase and gas phase extraction system connected with the repair wells and the extraction wells, the aerobic aeration and liquid phase and gas phase extraction system comprises air blasting equipment, moisture and nutrient substance blending equipment, landfill gas extraction equipment and leachate extraction equipment, the air blasting equipment is connected with the repair well, and an inlet connected with the moisture and nutrient substance blending equipment is formed in the air blasting equipment; and the landfill gas extraction equipment and the leachate extraction equipment are connected with the extraction well. According to the utility model, comprehensive treatment of the refuse landfill is realized, and the system is not only suitable for in-situ treatment of stock refuse without excavation and departure, but also suitable for stabilization pretreatment of stock refuse excavation, departure and ex-situ treatment.

Description

Technical Field

[0001] The utility model generally relates to the technical field of garbage disposal, mainly to a garbage landfill management technology, and specifically to a garbage landfill management system. Background Art

[0002] The development of landfills in my country has generally gone through five stages: scattered pit and ditch filling, centralized stacking, simple landfill, semi-sanitary landfill, and finally sanitary landfill. Early landfills were primarily based on the first four types. These informal landfills lacked anti-seepage measures at the bottom, internal methane collection and disposal systems, and inadequate top sealing. During the landfill's degradation process, large amounts of landfill gas are emitted in an uncontrolled manner, posing a safety hazard and containing various greenhouse gases. Rainfall also disperses the harmful substances produced by the degradation process into surrounding surface water, underlying soil, and groundwater.

[0003] During the remediation of informal landfills, existing waste and leachate must be disposed of. The presence and extent of contamination in the soil and groundwater on site require investigation and assessment. Depending on the specific landfill conditions, site use planning, and surrounding environmental sensitivities, and whether existing waste is removed from the site, remediation can be categorized as either in-situ or ex-situ. In-situ remediation primarily uses aerobic technologies to accelerate the degradation of existing waste, centrally collects and disposes of the landfill gas generated by degradation. Enhanced stormwater diversion, covering, and landscaping of the surface layer of existing waste prevent the spread of waste contamination to groundwater and surface water. Ex-situ remediation primarily involves stabilization, excavation, screening, and off-site resource disposal of existing waste. Leachate is typically extracted and treated. Currently, aerobic aeration degradation in in-situ remediation and waste stabilization and leachate extraction and treatment in ex-situ remediation are typically performed independently, with no seamless integration. The resulting degraded liquid becomes new leachate, making it difficult to fully extract and effectively dispose of it, creating a new source of pollution and secondary contamination of the soil and groundwater beneath the landfill. At the same time, during the long-term degradation process of existing garbage, a large amount of degradation liquid seeps down to form leachate and diffuses into the groundwater. Although the leachate is extracted, the degradation rate of the contaminated groundwater is slow due to factors such as lack of oxygen. As a result, there is a serious tailing rebound phenomenon of the contaminated groundwater exceeding the standard index, and it is difficult to naturally attenuate to meet the standard. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to propose a landfill management system for achieving comprehensive management of the landfill, and is not only suitable for in-situ management of existing garbage without excavation or removal from the site, but also for stabilization pretreatment of existing garbage after excavation and removal from the site.

[0005] The technical solution of the utility model is as follows:

[0006] The utility model provides a landfill management system, which includes a plurality of repair wells and a plurality of extraction wells arranged on the landfill, and an aerobic aeration, liquid phase and gas phase extraction system connected to the repair wells and the extraction wells. The aerobic aeration, liquid phase and gas phase extraction system includes an air blast device, a moisture and nutrient material mixing device, a landfill gas extraction device, and a leachate extraction device. The air blast device is connected to the repair wells, and is provided with an inlet connected to the moisture and nutrient material mixing device; the landfill gas extraction device and the leachate extraction device are connected to the extraction wells.

[0007] Furthermore, the repair well and the extraction well are used in pairs, the blowing equipment is used to supply air into the landfill garbage layer in the landfill, the landfill gas extraction equipment is used to extract the landfill gas in the landfill garbage layer, and the leachate extraction equipment is used to extract the leachate in the landfill garbage layer.

[0008] Furthermore, the blowing equipment includes an aeration blower and an aeration pipe that are interconnected, and the aeration pipe is arranged in the repair well.

[0009] Furthermore, the landfill gas extraction equipment includes a purification box composed of adsorption materials, an extraction fan and a landfill gas extraction pipe that are interconnected, and the landfill gas extraction pipe is arranged in the extraction well.

[0010] Furthermore, the leachate extraction equipment includes a leachate extraction pump, a leachate extraction pipe and a leachate disposal equipment that are interconnected. The leachate extraction pipe is arranged in the extraction well, and the leachate extracted by the leachate extraction pump enters the leachate disposal equipment for disposal.

[0011] Furthermore, the leachate disposal equipment includes a regulating tank and water treatment equipment.

[0012] Furthermore, the water and nutrient solution mixing equipment includes a water and nutrient solution compounding tank, and the water and nutrient solution compounding tank is connected to the blowing equipment.

[0013] Furthermore, a groundwater sampling pump and a groundwater sampling conduit are provided on the repair well. The repair well and the extraction well are arranged in pairs according to a polygonal grid, and the positions of the repair wells and the extraction wells are adjusted according to the degradation degree of the landfill waste and the actual situation on site.

[0014] Furthermore, the bottom of the repair well extends into the groundwater and is more than 1m away from the bottom of the landfill garbage layer. The well wall is made of perforated steel pipe or PVC pipe with a diameter of 10-50cm.

[0015] Furthermore, the bottom of the extraction well is flush with the bottom of the landfill garbage layer, and the well wall adopts an open-hole PVC pipe with a diameter of 10-50 cm.

[0016] The beneficial effects of the present invention compared to the prior art are:

[0017] During the landfill treatment process, air blowing equipment is used to achieve aerobic aeration of the landfilled garbage, thereby accelerating the degradation of the existing garbage; the landfill gas and leachate in the landfilled garbage are extracted and treated to achieve further purification of the landfilled garbage; and the soil and groundwater are sampled, tested and repaired by injecting chemicals to avoid the pollution of the landfilled garbage to the soil and groundwater, thus achieving comprehensive management of the landfill.

[0018] Furthermore, the above technical solution of the present invention is not only applicable to the in-situ treatment of existing garbage without excavation or leaving the site, but also applicable to the stabilization pretreatment of existing garbage after excavation and leaving the site. It has strong applicability and has achieved significant beneficial effects and overall benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0021] Figure 1 This is a schematic structural diagram of a landfill management system according to one embodiment of the present invention;

[0022] Figure 2 This is a flow chart of a landfill management method according to one embodiment of the present invention.

[0023] Figure numerals: 1. Landfill site plane, 2. Groundwater level, 3. Overlying soil layer of landfill garbage, 4. Landfill garbage layer, 5. Groundwater soaking landfill garbage layer (leachate layer), 6. Groundwater layer, 7. Repair well, 8. Extraction well, 9. Leachate disposal equipment, 10. Leachate extraction pump, 11. Landfill gas extraction equipment, 12. Explosion blower, 13. Water and nutrient solution mixing tank, 14. Groundwater sampling pump, 15. Groundwater sampling catheter, 16. Explosion pipe, 17. Landfill gas extraction pipe, 18. Leachate extraction pipe. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with the embodiments and drawings. Here, the illustrative embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention.

[0025] It should be understood that the terms "comprises / comprising," "consisting of," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product, apparatus, process, or method that includes a list of elements includes not only those elements but also, if necessary, other elements not explicitly listed, or elements inherent to such product, apparatus, process, or method. In the absence of further limitations, elements defined by the phrases "comprises / comprising," "consisting of," do not preclude the presence of additional identical elements in the product, apparatus, process, or method that includes the elements.

[0026] It is also necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device, component or structure referred to must have a specific direction, be constructed or operate in a specific direction, and cannot be understood as a limitation on the present invention.

[0027] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0028] The technical concept of the present invention includes: in response to the problems in the background technology, the embodiment of the present invention adopts the method of constructing repair wells and extraction wells on site in the landfill, aerating the interior of the landfill, adding air, moisture and nutrients, promoting the degradation of the existing garbage, and centrally collecting, disposing and utilizing the gas generated by the degradation; judging the degree of degradation of the existing garbage according to the degradation gas component index, extracting and selectively reinjecting the leachate through the extraction well channel, and enhancing the treatment effect through the synergistic degradation of microorganisms and aerobics in the leachate; sampling and evaluating the bottom soil and groundwater of the landfill, and injecting repair agents through the repair well or extraction well to repair the soil and groundwater in situ. The above processes cooperate with each other and work synergistically to achieve comprehensive treatment of the landfill.

[0029] according to Figure 1 As shown, one embodiment of the present invention provides a landfill management system, which includes a plurality of repair wells 7 and a plurality of extraction wells 8 arranged on the landfill, the repair wells 7 and the extraction wells 8 being used in pairs, and an aerobic aeration, liquid phase and gas phase extraction system connected to the repair wells and the extraction wells.

[0030] The aerobic aeration, liquid and gas phase extraction system includes a blowing device, a moisture and nutrient mixing device, a landfill gas extraction device 11, and a leachate extraction device. The blowing device is connected to the repair well 7, and the blowing device is provided with an inlet connected to the moisture and nutrient mixing device; the landfill gas extraction device 11 and the leachate extraction device are connected to the extraction well 8.

[0031] The blowing equipment is used to supply air to the landfill garbage layer in the landfill, so that the landfill garbage layer can achieve aerobic degradation; the landfill gas extraction equipment is used to extract the landfill gas in the landfill garbage layer; the leachate extraction equipment is used to extract the leachate in the landfill garbage layer.

[0032] The above-mentioned system is equipped with repair wells, extraction wells and supporting aerobic aeration, liquid phase and gas phase extraction systems. The various equipment in the aerobic aeration, liquid phase and gas phase extraction systems cooperate with each other and work synergistically, which not only realizes the detection of landfill waste, but also realizes the comprehensive management of landfill waste. It is not only suitable for in-situ management but also for ex-situ management, and has a wide range of application scenarios, thus achieving significant beneficial effects and overall benefits.

[0033] In a specific embodiment, the blowing equipment includes an interconnected aeration blower 12 and an aeration pipe 16, and the aeration pipe 16 is arranged in the remediation well 7; the landfill gas extraction equipment 11 includes an interconnected purification box composed of adsorption materials, an extraction fan and a landfill gas extraction pipe 17, and the landfill gas extraction pipe 17 is arranged in the extraction well 8; the leachate extraction equipment includes an interconnected leachate extraction pump 10, a leachate extraction pipe 18 and a leachate treatment equipment 9, and the leachate extraction pipe 18 is arranged in the extraction well 8. The leachate extracted by the leachate extraction pump 10 enters the leachate treatment equipment 9 for treatment, and the leachate treatment equipment 9 includes a regulating tank and a water treatment equipment; the water and nutrient mixing equipment includes a water and nutrient solution compounding tank 13, and the water and nutrient solution compounding tank 13 is connected to the blowing equipment; the remediation well is also provided with a groundwater sampling pump 14 and a groundwater sampling conduit 15.

[0034] In a specific embodiment, the repair well and the extraction well are arranged in pairs according to polygonal grids, such as a 20×20m grid, and the positions of each repair well and the extraction well can be adjusted according to the degree of degradation of the landfill waste and the actual situation on site; the bottom of the repair well 7 extends into the groundwater, and is more than 1m away from the bottom of the landfill waste layer 4. The well wall adopts a perforated steel pipe or PVC pipe, and the diameter of the perforated steel pipe or PVC pipe is preferably 10-50cm; the bottom of the extraction well 8 is flush with the bottom of the landfill waste layer 4, and the well wall adopts a perforated PVC pipe, and the diameter of the PVC pipe is preferably 10-50cm.

[0035] See also Figure 2 The method for treating a landfill using the system of the utility model comprises the following steps:

[0036] Step 1: Arrange a group of wells on the landfill; based on at least one of the following parameters of the landfilled garbage in the landfill: the biodegradability and organic matter content of the landfilled garbage, the composition and content of landfill gas, the composition and content of leachate, the composition and content of soil and groundwater, and the three-dimensional model of the landfill, reasonably arrange a group of wells including multiple repair wells 7 and multiple extraction wells 8 on the landfill, and the repair wells 7 and extraction wells 8 are used in pairs; wherein the repair wells 7 are used to provide the explosive gas, water and nutrient supply required for the degradation of the landfilled garbage, and serve as a sampling port for groundwater quality samples, and the extraction wells 8 are used as extraction channels for leachate and landfill gas, and can also be selectively used as injection channels for repairing soil and groundwater agents and as channels for replenishing water and nutrients.

[0037] Step 2: Establish an aerobic aeration, liquid phase and gas phase extraction system connected to the repair well and the extraction well; the aerobic aeration, liquid phase and gas phase extraction system includes a blower, a moisture and nutrient mixing device, a landfill gas extraction device, and a leachate extraction device, wherein the blower is connected to the repair well 7, and the blower is provided with an inlet connected to the moisture and nutrient mixing device; the landfill gas extraction device and the leachate extraction device are connected to the extraction well 8.

[0038] Step 3: Develop and implement a landfill remediation plan. A remediation plan is developed based on the parameters and corresponding indicators of the landfilled waste, and then the aerobic aeration, liquid-phase, and vapor-phase extraction systems are used to treat the landfill according to the remediation plan. Specifically, the plan includes: utilizing the aeration equipment to aerate the landfill layer 4 in the landfill through the remediation well 7; utilizing the landfill gas extraction equipment to extract landfill gas from the landfill layer through the extraction well; and utilizing the leachate extraction equipment to extract leachate from the landfill layer through the extraction well. Furthermore, a water and nutrient mixing device connected to the remediation well is activated and introduced into the landfill layer through the aeration equipment until the landfilled waste is degraded to meet national standards. National standards include the "Technical Requirements for Stabilized Site Utilization of Municipal Waste Landfills." More stringent emission or remediation standards can also be implemented to achieve better environmental protection.

[0039] The above embodiment sets up repair wells, extraction wells and supporting aerobic aeration, liquid phase and gas phase extraction systems. The various devices in the aerobic aeration, liquid phase and gas phase extraction systems cooperate with each other and work synergistically, which not only realizes the detection of landfill waste, but also realizes the comprehensive management of landfill waste. It is not only applicable to in-situ management but also to ex-situ management, and has a wide range of application scenarios, thereby achieving significant beneficial effects and overall benefits.

[0040] Furthermore, the step 3 further includes:

[0041] After the landfill waste in the landfill has been degraded to meet national standards and the leachate has been extracted, the soil and groundwater components and content are tested to determine whether they meet national standards. If not, the remediation agent is injected through the extraction well 8. The migration of groundwater causes the agent to come into contact and react with the soil and groundwater. Periodic sampling of groundwater at different depths is then repeated, with testing, evaluation, and injections repeated until the soil and groundwater components and content meet national standards. In other words, step 3 also includes soil and groundwater remediation processes.

[0042] In one or some specific implementations, the following steps are also included before step 1:

[0043] Step 0: Landfill survey. By drilling and sampling the landfill, at least one of the following parameters of the landfill waste is obtained: biodegradability and organic matter content of the landfill waste, landfill gas composition and content, leachate composition and content, or soil and groundwater composition and content. At least one of the following values of the landfill is detected or calculated: surface soil thickness, landfill waste layer thickness, or leachate depth, and a three-dimensional model of the landfill is constructed based on these values. Of course, the above parameters and values are not limited to the examples above; the measurement or acquisition of other relevant parameters and values is within the scope of this embodiment.

[0044] Through sampling, statistics and testing, the various parameters and three-dimensional models of the landfill are accurately obtained. The purpose of obtaining the relevant parameters, indicators and three-dimensional models of the landfill waste is to better arrange the well group and formulate a treatment plan that is more suitable for the actual situation and takes into account the overall benefits.

[0045] In one embodiment, the step 3 further includes:

[0046] Step 4, post-operation and monitoring; after the landfill waste degradation is stably achieved and reaches the national standard, if excavation and off-site treatment is not adopted, the remediation well 7 is used as a groundwater monitoring and sampling channel, and the extraction well 8 is used as a landfill gas monitoring channel for the landfill waste. The status of the landfill waste is monitored on a long-term basis based on the parameters and indicators of the landfill gas and the groundwater. If the parameters exceed the standard, at least one of aerobic aeration, leachate extraction or soil and groundwater remediation agent injection is restarted for treatment.

[0047] Post-operation and monitoring are also important links in landfill management, which ensure the integrity of landfill management and make the management truly effective.

[0048] Specifically, the step 1 includes:

[0049] The repair well 7 and the extraction well 8 are arranged at intervals according to a polygonal grid. For example, the grid can be composed of a 20×20m square. The positions of each repair well and the extraction well can be adjusted according to the degree of degradation of the landfill garbage and the actual situation on site; the depth of the repair well is greater than the depth of the extraction well, and the bottom of the repair well extends into the groundwater, and is more than 1m away from the bottom of the landfill garbage layer 4, preferably more than 2m. The well wall adopts a perforated steel pipe or PVC pipe, and the diameter of the perforated steel pipe or PVC pipe is preferably 10-50cm; the bottom of the extraction well is flush with the bottom of the landfill garbage layer, and the well wall adopts a perforated PVC pipe, and the diameter of the PVC pipe is preferably 10-50cm, and can also be other numerical ranges.

[0050] The depth of the repair well and the extraction well can be selected according to the actual situation of the landfill, and the well wall pipes can also be made of other corrosion-resistant and strong materials, which are not specifically limited here.

[0051] Specifically, the aerobic aeration, liquid phase and gas phase extraction systems in step 2 can be set up as follows:

[0052] The blasting equipment includes an explosion blower 12 and an aeration pipe 16, and the aeration pipe 16 is arranged in the repair well 7. The above-mentioned blasting equipment is used to explode gas into the landfill garbage layer through the aeration pipe, and the surplus explosion gas and degradation gas are extracted through the landfill gas extraction equipment and discharged after purification and meeting the standards; the landfill gas extraction equipment 11 includes a purification box composed of adsorption material, an extraction fan and a landfill gas extraction pipe 17, and the landfill gas extraction pipe 17 is (partially) arranged in the extraction well 8; the leachate extraction equipment includes a leachate extraction pump 10, a leachate extraction pump connected to the leachate extraction pump, and a leachate extraction pump 17. The filtrate extraction pipe 18 and the leachate disposal equipment are provided in the extraction well 8. The leachate extracted by the leachate extraction pump 10 enters the leachate disposal equipment 9 for disposal. The leachate disposal equipment 9 includes a regulating tank and a water treatment equipment (not shown in the figure); the water and nutrient compounding equipment includes a water and nutrient solution compounding tank 13, and the water and nutrient solution compounding tank 13 is connected to the air blowing equipment; the repair well 7 is also provided with a groundwater sampling pump 14 and a groundwater sampling conduit 15 for sampling groundwater for detection and analysis. The groundwater sampling pump is preferably a peristaltic pump to ensure the realization of sampling.

[0053] Of course, in order to achieve sampling and testing, landfill gas, leachate, soil and groundwater sampling probes can be set in the repair well or extraction well according to actual needs.

[0054] In one embodiment, step 3 specifically includes the following process:

[0055] Analyzing the proportion of methane in the landfill gas and adjusting the frequency and air volume of aerobic aeration of the blower according to the proportion of methane;

[0056] The aerobic degradation progress of the landfill waste is determined based on the change in the proportion of methane. When the preset degradation progress is reached, the water and nutrient mixing device is activated. The explosive gas generated by the air blowing device is used to deliver water and nutrients into the landfill waste layer to accelerate aerobic degradation.

[0057] Start the leachate extraction pump 10 to extract the leachate, and the extraction speed matches the leachate speed produced by aerobic degradation to avoid extracting groundwater, thereby increasing the leachate disposal volume;

[0058] According to the content of characteristic gases in the landfill gas and the requirements of the aerobic microbial environment, the landfill gas extraction device 11 is started in a timely manner. After the biodegradability of the landfill waste, the methane content, and the landfill settlement index meet the requirements of the national standards, the landfill gas extraction device 11 is stopped. At this time, the leachate extraction device continues to operate until all the leachate is extracted, at which time the leachate extraction device is stopped.

[0059] According to the sampling and analysis results of the soil and groundwater, when remediation is required, the soil and groundwater remediation agent is injected into the soil and groundwater through the leachate extraction pipe 18.

[0060] A specific embodiment is given below to specifically illustrate the landfill management system disclosed in the present utility model.

[0061] Example

[0062] An informal landfill is located in a riverbank and mudflat at the urban-rural fringe of a provincial capital. The geological conditions are mainly sand and gravel, with a depth of more than 30 meters. No anti-seepage measures were taken at the beginning of landfill. According to relevant requirements, in-situ repair and treatment is required. Combined with the method of this utility model, the technical solution and steps for treatment are as follows.

[0063] (1) Landfill survey. Through sampling, statistics and testing, the three-dimensional structure of the informal garbage layer was accurately determined: the average thickness of the garbage surface soil was 1 meter, the garbage landfill depth was 3-5 meters, the landfill gas in the garbage layer contained methane, hydrogen sulfide and other components, and the bottom layer of about 1 meter of garbage was immersed in groundwater. The investigation found that the biodegradability of the landfill garbage was greater than 20%, and the groundwater indicators of the garbage-immersed part far exceeded the leachate discharge standard, which was considered garbage leachate. The chemical oxygen demand, ammonia nitrogen and other indicators of the bottom groundwater exceeded the relevant groundwater quality standards. A three-dimensional model of garbage cover-landfill garbage-leachate was established.

[0064] (2) In-situ treatment and well layout. Figure 1As shown, the repair wells 7 and extraction wells 8 are spaced along a 20m x 20m grid, with their locations fine-tuned based on the degree of landfill waste degradation and actual site conditions. The repair wells 7 are 6-8 meters deep and approximately 15 centimeters in diameter. They penetrate the overburden 3 and ensure a penetration of at least 2 meters into the landfill layer 4. The well walls can be constructed of perforated steel or PVC pipe. A plastic gas blasting tube 16 is connected to the wellbore in the landfill layer, blasting gas into the landfill layer 4. A water probe is installed at the bottom of the well, and groundwater samples are collected through a groundwater sampling conduit 15. The extraction well 8 is 4-6 meters deep and about 15 centimeters in diameter. Its depth is flush with the bottom of the landfill garbage layer 4. The well wall is protected by an open-hole PVC pipe and has a built-in landfill gas extraction pipe 17. The gas collection probe is located in the landfill layer 4 and is above the groundwater level 2. The leachate extraction pipe 18 is located in the groundwater-soaked landfill garbage layer (leachate layer) 5 and collects groundwater through the water sampling probe. After all the leachate is extracted, the leachate extraction pipe 18 can also be used as a channel for adding repair agents during the soil and groundwater remediation period.

[0065] (3) Aerobic aeration and liquid and gas phase extraction system. The aeration device of the repair well inputs air into the landfill garbage layer 4 through the aeration blower 12, and at the same time adds water and nutrient solution to the transported air through the water and nutrient solution compounding tank 13; the groundwater sampling pump 14 is connected to the groundwater sampling conduit 15, and a peristaltic pump is generally used to sample the groundwater; the landfill gas extraction equipment 11 mainly includes a purification box composed of adsorption materials such as activated carbon and an extraction fan, and the leachate extraction pump 10 is connected to the leachate extraction pipe 18 to extract the leachate. The extracted leachate enters the leachate treatment equipment 9 for treatment. The leachate treatment equipment 9 includes a regulating tank, water treatment equipment, etc.

[0066] (4) Formulate a treatment plan and implement in-situ treatment. After the aerobic explosion and liquid and gas extraction systems are built, start the explosion blower 12 to explode the landfill garbage layer 4. The surplus explosion gas and degradation gas are purified and discharged through the landfill gas extraction equipment 11. The methane content ratio in the landfill gas is analyzed to adjust the explosion frequency and air volume. The aerobic degradation progress of the landfill garbage is judged according to its change law. Start the water and nutrient solution compounding pool 13 in time to add water and nutrient solution to the landfill garbage layer 4 through explosion to accelerate aerobic degradation; at the same time, start the leachate extraction pump 10 to extract the original leachate. At the same time, it is necessary to match the explosion aerobic degradation Increase the leachate speed to avoid groundwater mixing and increase the leachate disposal volume; the landfill gas extraction equipment 11 starts the exhaust fan in time according to the content of characteristic gases such as methane in the landfill gas and the microbial environment requirements of the aerobic system, and runs until the indicators such as the biodegradability, methane content, and sedimentation of the landfill garbage meet the relevant requirements of the national standard "Technical Requirements for Stabilization Site Utilization of Municipal Waste Landfills". After the aerobic explosion is completed, the leachate extraction continues for a period of time after the aerobic explosion is completed to ensure that all the leachate is extracted.

[0067] (5) Post-operation and monitoring. After the aerobic aeration degradation of landfill waste has reached the standard, groundwater samples are collected regularly through the groundwater sampling conduit 15 and the groundwater sampling pump 14 to determine whether the groundwater exceeds the standard. The landfill gas is taken in conjunction with the landfill gas extraction pipe 17 to analyze the degradation of the landfill waste after the aeration is stopped and whether it continues to pollute the groundwater. If there is incomplete degradation and rebound phenomenon such as groundwater pollution, the aerobic aeration equipment and leachate extraction equipment are restarted to accelerate the degradation of the landfill waste and extract the newly degraded leachate to avoid groundwater pollution. If the relevant indicators of groundwater exceed the standard seriously and the natural attenuation rate is slow, and it is found to exceed the acceptable value after detection, a repair agent can be added to the bottom layer of the landfill waste through the leachate extraction pipe 18. Through groundwater migration and combination with the bottom soil and groundwater, in-situ repair is carried out to the target value. After that, the groundwater sampling tube 15 in the repair well 7 is used to sample and monitor the changes in groundwater, and the landfill waste degradation is monitored through the landfill gas extraction pipe 17 in the extraction well 8. The landfill waste is monitored online. If the risk of any link exceeds the acceptable range, the environmental risks of the informal landfill are repaired and controlled by restarting aerobic explosion, extracting leachate, and injecting soil and groundwater remediation agents.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0069] The above-mentioned embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims

1. A landfill management system, characterized by: The treatment system includes multiple repair wells and multiple extraction wells set up on the landfill, and aerobic aeration, liquid and gas extraction systems connected to the repair wells and the extraction wells. The aerobic aeration, liquid and gas extraction systems include air blowing equipment, water and nutrient mixing equipment, landfill gas extraction equipment, and leachate extraction equipment. The air blowing equipment is connected to the repair wells, and the air blowing equipment is equipped with an inlet connected to the water and nutrient mixing equipment; the landfill gas extraction equipment and the leachate extraction equipment are connected to the extraction wells.

2. The treatment system according to claim 1, characterized in that: The repair well and the extraction well are used in pairs, the blowing equipment is used to supply air to the landfill garbage layer in the landfill, the landfill gas extraction equipment is used to extract the landfill gas in the landfill garbage layer, and the leachate extraction equipment is used to extract the leachate in the landfill garbage layer.

3. The treatment system according to claim 2, characterized in that: The blowing equipment includes an aeration blower and an aeration pipe which are interconnected, and the aeration pipe is arranged in the repair well.

4. The treatment system according to claim 2, characterized in that: The landfill gas extraction equipment includes a purification box composed of adsorption materials, an extraction fan and a landfill gas extraction pipe which are interconnected. The landfill gas extraction pipe is arranged in the extraction well.

5. The treatment system according to claim 2, characterized in that: The leachate extraction equipment includes a leachate extraction pump, a leachate extraction pipe and a leachate disposal equipment that are interconnected. The leachate extraction pipe is arranged in the extraction well. The leachate extracted by the leachate extraction pump enters the leachate disposal equipment for disposal. The leachate disposal equipment includes a regulating tank and water treatment equipment.

6. The treatment system according to claim 2, characterized in that: The water and nutrient solution mixing equipment includes a water and nutrient solution compounding tank, and the water and nutrient solution compounding tank is connected to the air blowing equipment.

7. The treatment system according to claim 1, characterized in that: The repair well is also provided with a groundwater sampling pump and a groundwater sampling conduit.

8. The treatment system according to claim 1, characterized in that: The repair wells and the extraction wells are arranged in pairs according to polygonal grids, and the positions of the repair wells and the extraction wells are adjusted according to the degradation degree of the landfill waste and the actual situation on site.

9. The treatment system according to claim 1, characterized in that: The bottom of the repair well extends into the groundwater and is more than 1m away from the bottom of the landfill layer. The well wall is made of perforated steel pipe or PVC pipe with a diameter of 10-50cm.

10. The treatment system according to claim 1, characterized in that: The bottom of the extraction well is flush with the bottom of the landfill garbage layer, and the well wall is made of open-hole PVC pipe with a diameter of 10-50 cm.

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