Stabilization treatment system for household garbage landfill

Abstract

The utility model provides a stabilizing treatment system for a household garbage landfill, which comprises a PLC (Programmable Logic Controller) control device which is respectively connected with a gas extraction well, a water replenishing well and a gas injection well through a gas extraction pipeline, a water replenishing pipeline and a gas injection pipeline; a monitoring and control device and a pollutant treatment device are arranged in each of the air exhaust pipeline and the air injection pipeline; and a monitoring and control device and a pollutant treatment device are also arranged in the water replenishing pipeline. According to the system, through arrangement of various devices, a good oxygen-enriched environment is formed in the domestic garbage body, rapid decomposition of organic matter in a domestic garbage heap body can be accelerated, the purpose of rapidly degrading the organic matter in the domestic garbage heap body is achieved, the domestic garbage in the heap body is stabilized, and garbage excavation and site comprehensive utilization in the later period are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of municipal solid waste disposal technology, and more specifically, to a municipal solid waste landfill stabilization treatment system. Background Technology

[0002] In the final stages of municipal solid waste landfill management, HDPE membranes are primarily used for sealing and covering. Due to the large volume of waste stored in landfills—often exceeding 2 million cubic meters for small and medium-sized landfills and over 5 million cubic meters for large ones—and the anaerobic environment created by the HDPE membrane impermeable covering, the organic matter in the waste degrades slowly, typically requiring over 10 years for complete degradation. During this degradation process, the waste pile undergoes varying degrees of settlement, making it impossible to construct structures on top. Furthermore, the large amounts of methane gas produced by the organic matter in the anaerobic environment hinder subsequent excavation and remediation, impeding effective land resource utilization. Stabilized waste significantly reduces odor generation, making subsequent excavation and resource utilization more efficient. Therefore, stabilization treatment of the waste pile is essential for both existing municipal solid waste management and landfill ecological restoration before proceeding with further engineering work.

[0003] In view of this, the present invention is hereby proposed. Utility Model Content

[0004] The purpose of this invention is to provide a stabilization treatment system for municipal solid waste landfills. This stabilization treatment system can stabilize municipal solid waste, creating a favorable oxygen-rich environment inside the waste, which can accelerate the rapid decomposition of organic matter inside the waste, thereby facilitating subsequent waste excavation and comprehensive site utilization.

[0005] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted:

[0006] This utility model provides a stabilization treatment system for municipal solid waste landfills, including: a PLC control device, which is connected to an extraction well, a water supply well, and an injection well via an extraction pipeline, a water supply pipeline, and an injection pipeline, respectively; the extraction pipeline and the injection pipeline are equipped with monitoring and control devices and pollutant treatment devices, and the water supply pipeline is also equipped with monitoring and control devices and pollutant treatment devices.

[0007] In this invention, the PLC control device is used for stable operation management. It can record monitoring information and parameters in a timely manner, and analyze and calculate the acquired data through the PLC control device. Then, based on the results of the analysis and calculation, it can adjust the operation of the entire system.

[0008] The system includes extraction pipelines and wells for drawing in, enriching, and wetting odorous gases from the landfill, thereby controlling these gases. Simultaneously, injection wells and pipelines create an aerobic environment within the municipal solid waste pile, accelerating the decomposition of organic matter. In addition, water supply pipelines and wells increase the humidity of the waste pile. These various pipelines and wells comprehensively control oxygen content, temperature, humidity, and other parameters within the waste pile, promoting the rapid reproduction of aerobic microorganisms and facilitating the subsequent rapid degradation of organic matter in the waste. This also facilitates subsequent excavation and comprehensive utilization of the landfill site.

[0009] The system is also equipped with monitoring and control devices as well as pollutant treatment devices. The monitoring devices can monitor various gases in the landfill, thereby enabling real-time monitoring of the landfill environment. The control devices can control the opening and closing of the landfill pipelines and the flow rate in real time. The treated waste gas and waste liquid can be further treated by the pollutant treatment devices to achieve the stabilization and utilization of municipal solid waste.

[0010] Preferably, as a further specific implementation, the air extraction pipeline, water supply pipeline, and air injection pipeline include multiple air extraction pipeline branches, water supply pipeline branches, and air injection pipeline branches connected in parallel.

[0011] The setup of multiple branch roads can provide as much coverage as possible for the landfill, while ensuring the landfill's operational efficiency.

[0012] Preferably, as a further specific implementation, the extraction pipe branch, the water supply pipe branch, and the gas injection pipe branch are respectively provided with an extraction well, a water supply well, and a gas injection well; the gas injection wells and the extraction wells are arranged alternately, the water supply well is located in the middle of the gas injection wells and the extraction wells, and the gas injection wells, water supply wells, and extraction wells are evenly distributed in the landfill.

[0013] Preferably, as a further specific embodiment, the gas injection pipe branch is provided with a gas injection electric butterfly valve, and a gas injection fan is also provided downstream of the gas injection pipe.

[0014] In this invention, both the electric butterfly valve and the air injection blower can be controlled by a PLC control device to regulate their operating modes. The electric butterfly valve controls the air flow rate in the air injection pipeline, while the air injection blower continuously pumps air into the pipeline, allowing air to flow continuously into the injection well.

[0015] Preferably, as a further specific embodiment, the monitoring and control device installed in the exhaust pipeline includes a gas monitor, an electric solenoid valve for exhaust, and an exhaust fan; wherein the electric butterfly valve for exhaust is directly connected to the exhaust fan, and the gas monitor is connected to the electric butterfly valve for exhaust.

[0016] A gas monitor is installed in the extraction pipeline. This monitor tracks the gas produced in the extraction well and monitors the gas flow rate within the pipeline. An electric butterfly valve controls the flow rate, adjusting the flow velocity. An extraction fan provides power for the gas movement within the pipeline. Furthermore, the gas monitor feeds back the monitored data to a PLC control unit. The PLC displays the data on a touchscreen and controls the electric butterfly valve and extraction fan, thus adjusting the extraction pipeline.

[0017] In addition, in order to ensure real-time monitoring of the gas extraction process, the positions of the gas monitor and the electric butterfly valve are limited; the gas monitor needs to be upstream of the electric butterfly valve.

[0018] Preferably, as a further specific embodiment, the monitoring and control device installed in the water supply pipeline includes a water supply solenoid valve and a flow monitor, wherein the water supply solenoid valve is directly connected to the water supply pump; and wherein the flow monitor is located upstream of the water supply solenoid valve.

[0019] The water supply solenoid valve controls the flow rate in the water supply pipeline. The water supply pump can refill the water supply pipeline with liquid from the leachate storage tank. A flow monitor installed in the water supply pipeline monitors the liquid flow rate. Similarly, the flow monitor is located upstream of the water supply solenoid valve for real-time monitoring of the water injection process.

[0020] The flow monitor can feed back the monitored data to the PLC control device, which can display the feedback data on the touch screen and control the status of the water supply solenoid valve and water supply pump to adjust the water supply pipeline.

[0021] Preferably, as a further specific embodiment, the pollutant treatment device includes a leachate storage tank and a tail gas scrubbing tower; the leachate storage tank is located at the end of the water supply pipeline and is directly connected to the water supply pump; the tail gas scrubbing tower is located at the end of the exhaust pipeline and is directly connected to the exhaust fan.

[0022] Since the working mode of the extraction well is to transport the gas extracted from the extraction well to the tail gas scrubbing tower by an extraction fan, the tail gas scrubbing tower is set at the end of the extraction pipeline to facilitate the washing of the extracted polluted gas; the leachate storage tank needs to reinject the leachate stored in it into the water replenishment well, so it is set at the end of the water replenishment pipeline to facilitate the reinjection of the liquid.

[0023] Preferably, as a further specific embodiment, the exhaust gas scrubbing tower is provided with a water tank at the bottom, an exhaust gas outlet at the top, and a spraying device at the lower end of the exhaust gas outlet.

[0024] The exhaust gas scrubbing tower is equipped with a water tank to facilitate the upward transport of the scrubbing liquid, which is sprayed downward from the top of the tower. Since gases move upward due to their own properties, the exhaust gas outlet is located at the very top of the exhaust gas scrubbing tower to facilitate the scrubbing of polluted gases and subsequent emissions.

[0025] Preferably, as a further specific implementation, the PLC control device is also connected to a touch screen for controlling the operation of the municipal solid waste landfill stabilization treatment system.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] (1) The PLC control device enables highly automated control, which reduces the workload of staff, makes management easy and convenient, and flattens the management structure, improves work efficiency, and saves operating costs.

[0028] (2) This utility model achieves full coverage of landfills through the setting of various pipelines. The number of branch pipelines and various wells can be flexibly adjusted according to actual usage needs. It can adapt to the stabilization treatment of domestic waste landfill under various conditions. The main body of the system has great flexibility.

[0029] (3) By setting up various devices, the efficiency of waste treatment is effectively improved, and the stabilization treatment of domestic waste is achieved, so that a good environment is formed inside the domestic waste body, which can accelerate the rapid decomposition of organic matter inside the domestic waste body, and achieve the purpose of rapidly degrading the organic matter in the domestic waste pile, so as to facilitate the later waste excavation and comprehensive utilization of the site. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 : This is a diagram of a landfill facility.

[0032] The markings in the attached figure are as follows:

[0033] 1. Air extraction well; 2. Water replenishment well; 3. Air injection well; 4. Water replenishment solenoid valve; 5. Air injection electric butterfly valve;

[0034] 6. Gas monitor; 7. Electric butterfly valve for exhaust; 8. Exhaust fan; 9. Injection fan;

[0035] 10. Makeup water pump; 11. Leachate storage tank; 12. Tail gas scrubbing tower; 13. Sprayer;

[0036] 14. PLC controller; 15. Touch screen; 16. Flow monitor; 17. Landfill. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] To more clearly illustrate the technical solutions in this invention, specific embodiments are described below.

[0041] Example

[0042] Depend on Figure 1 The diagram shows the landfill layout. A PLC control unit 14 is connected to a touchscreen 15. The PLC control unit 14 is connected via circuits to the extraction pipeline, injection pipeline, and water supply pipeline. Each of the extraction, injection, and water supply pipelines has its own branch lines. These branches are evenly distributed throughout the landfill 17. Extraction wells 1 are evenly distributed within the extraction pipeline branches, injection wells 3 are evenly distributed within the injection pipeline branches, and water supply wells 2 are evenly distributed within the water supply pipeline branches. The water supply wells 2 are positioned between the extraction wells 1 and injection wells 3 to maintain humidity around them, which is beneficial for the growth of aerobic microorganisms. The injection wells 3 and extraction wells 1 are staggered to prevent interference between them. The injection wells 3, water supply wells 2, and extraction wells 1 are evenly distributed throughout the landfill 17.

[0043] Each branch of the gas injection pipeline is equipped with a gas injection electric butterfly valve 5, and a gas injection fan is connected to the downstream end of the gas injection pipeline. Each branch of the water supply pipeline is equipped with a flow monitor 16, and a water supply solenoid valve 4 is located downstream of the flow monitor 16. A water supply pump 10 is located downstream of the water supply pipeline, and a leachate storage tank 11 is connected downstream of the water supply pump 10. Each branch of the exhaust pipeline is equipped with a gas monitor 6 and an exhaust electric butterfly valve 7, with the gas monitor 6 located upstream of the exhaust electric butterfly valve 7. The exhaust electric butterfly valve 7 is connected to an exhaust fan 8 through an exhaust pipeline, and a tail gas scrubbing tower 12 is connected downstream of the exhaust fan 8.

[0044] The exhaust gas scrubbing tower 12 is equipped with a water tank and a sprayer 13 is installed on top of it. The exhaust gas scrubbing tower 12 is installed on top of the sprayer 13.

[0045] The PLC controller 14 can be connected to the exhaust pipe, the injection pipe, and the water supply pipe, as well as their corresponding branches, via circuitry. It can also be connected to the water supply solenoid valve 4, the injection electric solenoid valve 5, the gas monitor 6, the exhaust electric butterfly valve 7, the exhaust fan 8, the injection fan 9, the water supply pump 10, the leachate storage tank 11, the tail gas scrubbing tower 12, the flow monitor 16, and the sprayer 13 via circuitry, thereby enabling control of the aforementioned devices.

[0046] The number of extraction wells 1, water replenishment wells 2 and gas injection wells 3 is not limited in this utility model. The specific number used needs to be determined based on the actual land area and the amount of waste in the landfill 17.

[0047] This utility model has 5 operating modes, specifically:

[0048] (1) Operation mode 1: Normal aerobic operation mode

[0049] The normal aerobic operation mode is mainly used in the early stage of stabilization treatment. During this mode, the PLC controller 14 controls the opening of the water supply solenoid valve 4, the air injection electric butterfly valve 5, and the air extraction electric butterfly valve 7. Under the control of the PLC controller 14, the exhaust fan 8 continuously operates, continuously extracting gas from the extraction well 1. The gas passes through the gas monitor 6 and the air extraction electric butterfly valve 7. The gas monitor 6 monitors the gas flow rate; if the flow rate is too high or too low, the gas monitor 6 returns the data to the PLC controller 14, which then controls the air extraction electric butterfly valve 7 to achieve flow control. The extracted gas enters the tail gas scrubbing tower 12. The exhaust gas moves continuously from bottom to top, and the scrubbing liquid in the tail gas scrubbing tower 12 is sprayed out from the sprayer 13 to treat the exhaust gas. The treated exhaust gas is discharged from the top of the tail gas scrubbing tower 12.

[0050] Simultaneously, the liquid in the leachate storage tank 11 continuously enters the water supply pipeline through the water supply pump 10, then enters the water supply branch, and finally enters the water supply well 2 through the water supply solenoid valve 4 and the flow monitor 16. During leachate injection, the flow monitor 16 controls the liquid flow rate. When the flow rate is too high or too low, the flow monitor 16 can return the data to the PLC controller 14. The PLC controller 14 then controls the water supply solenoid valve 4 to achieve liquid flow control. At this time, the air injection fan 9 is turned on, and air continuously enters the air injection well 3 through the air injection electric butterfly valve 5. Since the air injection flow rate is a set fixed flow rate, no additional flow monitoring equipment is required. The PLC controller 14 can automatically control the system operation. At the same time, the operator can control the PLC controller 14 through the touch screen 15 to achieve manual control and monitoring.

[0051] (2) Operation mode 2: Low load aerobic operation mode

[0052] This mode is applicable when the temperature of the municipal solid waste pile is too high, in which case there is no air injection, gas extraction, or leachate recharge, or no air injection or gas extraction, only leachate recharge. The leachate recharge method is the same as the leachate pipeline operation mode in operation mode 1, except that the gas working pipeline is shut off.

[0053] (3) Operating mode 3: High humidity mode

[0054] This mode is mainly used when the reactor body moisture has reached the optimal range required for aerobic reaction. In this mode, no leachate is injected; only air is injected while air is simultaneously extracted. The air injection and extraction methods are the same as those in mode 1, where the air injection and extraction pipelines operate in the same way.

[0055] (4) Operation mode 4: Transitional aerobic mode

[0056] It is mainly used in the later stage of aerobic stabilization operation. Intermittent air injection, gas extraction and leachate recharge. This working mode is the same as working mode 1, except that the system is turned on, then turned off for a period of time, and then turned on again, and so on.

[0057] (5) Operation mode 5: Shutdown monitoring mode

[0058] In this mode, air injection and extraction are stopped, as is water injection, but the monitoring device installed in the pipeline is activated to continuously collect and control data.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stabilization treatment system for municipal solid waste landfills, characterized in that, include: The PLC control device is connected to the gas extraction well, water supply well, and gas injection well via gas extraction pipeline, water supply pipeline, and gas injection pipeline, respectively. The gas extraction pipeline and the gas injection pipeline are equipped with monitoring and control devices and pollutant treatment devices, and the water supply pipeline is also equipped with monitoring and control devices and pollutant treatment devices.

2. The municipal solid waste landfill stabilization treatment system according to claim 1, characterized in that, The air extraction pipeline, water supply pipeline, and air injection pipeline include multiple air extraction pipeline branches, water supply pipeline branches, and air injection pipeline branches connected in parallel.

3. The municipal solid waste landfill stabilization treatment system according to claim 2, characterized in that, The extraction pipe branch, water supply pipe branch, and gas injection pipe branch are respectively equipped with extraction wells, water supply wells, and gas injection wells; the gas injection wells and the extraction wells are arranged alternately, and the water supply wells are located in the middle of the gas injection wells and the extraction wells. The gas injection wells, water supply wells, and extraction wells are evenly distributed in the landfill.

4. The municipal solid waste landfill stabilization treatment system according to claim 3, characterized in that, An electric butterfly valve for gas injection is installed in the gas injection pipe branch, and a gas injection fan is also installed downstream of the gas injection pipe.

5. The municipal solid waste landfill stabilization treatment system according to claim 2, characterized in that, The monitoring and control device installed in the exhaust pipeline includes a gas monitor, an electric exhaust butterfly valve, and an exhaust fan; wherein the electric exhaust butterfly valve is directly connected to the exhaust fan, and the gas monitor is connected to the electric exhaust butterfly valve.

6. The municipal solid waste landfill stabilization treatment system according to claim 5, characterized in that, The monitoring and control device installed in the water supply pipeline includes a water supply solenoid valve and a flow monitor. The water supply solenoid valve is directly connected to the water supply pump. The flow monitor is located upstream of the water supply solenoid valve.

7. The municipal solid waste landfill stabilization treatment system according to claim 6, characterized in that, The pollutant treatment device includes a leachate storage tank and a tail gas scrubbing tower; the leachate storage tank is located at the end of the water supply pipeline and is directly connected to the water supply pump; the tail gas scrubbing tower is located at the end of the exhaust pipeline and is directly connected to the exhaust fan.

8. The municipal solid waste landfill stabilization treatment system according to claim 7, characterized in that, The exhaust gas scrubbing tower has a water tank at its bottom and an exhaust gas outlet at its top, with a spraying device at the lower end of the exhaust gas outlet.

9. The municipal solid waste landfill stabilization treatment system according to claim 6, characterized in that, The PLC control device is also connected to a touch screen for controlling the operation of the municipal solid waste landfill stabilization treatment system.

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