With the gradual improvement of urban waste treatment models, more and more landfills have entered the “closure management” stage. However, closure does not mean the end of risks. On the contrary, the management after closure should pay more attention to the monitoring and control of long-term methane emissions. As one of the most important greenhouse gases in the anaerobic decomposition of garbage, methane will continue to be released for decades in the deep layer of landfill. If it is not effectively managed, it is likely to cause environmental pollution and safety accidents. At this time, the methane detector with long-term monitoring capability becomes the “sentinel” of the later operation and maintenance of the landfill, escorting environmental safety.
Methane Generation Mechanism And Release Risk Of Closed Landfill
Even if the covering and ecological restoration are completed, there are still a large number of organic matter that is not completely stabilized inside the landfill. These substances continue to decompose in anoxic environments, producing a large amount of landfill gas mainly composed of methane. Methane is released most violently at the beginning of closure, and then gradually decreases, but its release cycle may last for more than 30 years. If the closure structure is damaged, the gas guide system fails or the detection is missing, it may cause gas accumulation, trigger explosion or leakage into the atmosphere, posing a long-term threat to the surrounding environment.
In addition, methane also has a strong greenhouse effect, and its greenhouse effect potential (GWP) is more than 25 times that of carbon dioxide. If there is a lack of long-term emission data accumulation and trend analysis, it will not only increase environmental risks, but also affect the scientific formulation of carbon emission reduction statistics and climate change response strategies.
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Adaptability Of Detection Equipment: Core Technical Guarantee In The Closure Stage
In landfill closure management, traditional sampling and laboratory analysis methods are costly and inefficient, and it is difficult to meet the requirements of continuity and real-time performance. In contrast, modern methane detection equipment has become an ideal choice for closure monitoring due to its highly automated, intelligent and adaptable characteristics.
In terms of deployment, methane detectors can be installed at the outlet of the gas guide well, the boundary of the closure, and above key areas, and can be linked with drones and mobile detection platforms to achieve flexible supplementation and hotspot tracking. Higher-end models also support data encryption upload and platform access, building an intelligent monitoring cloud map to achieve full-process data visualization from the equipment end to the management end.
Data-Driven Operation And Maintenance Optimization And Environmental Compliance
Methane monitoring after closure is not only a means of risk warning, but also an important support for the long-term operation of landfills and government environmental compliance management. Through continuous collection and analysis, managers can:
Evaluate the methane attenuation law: By monitoring the concentration changes of different gas wells, judge the methane generation trend and residual reaction intensity in each area, and then optimize the gas structure maintenance plan and gas collection strategy.
Assist environmental impact assessment (EIA) and carbon reduction report: Real-time data helps to quantify the total amount of greenhouse gas emissions from the site after closure, which serves as an important basis for formulating greenhouse gas emission reduction measures.
Discover structural hidden dangers: If the monitoring results change suddenly or the spatial distribution is abnormal, it may indicate structural problems such as cracks in the overburden layer, gas seepage or damage to the gas well. Early repair can avoid subsequent environmental accidents.
Ensure the safety of surrounding residents: For closed sites close to residential areas, methane monitoring data can directly serve the health protection of residents, reduce the complaint rate and improve social trust.
Conclusion: Methane Detection Technology Continues The Green Lifeline Of Landfills
In the context of “dual carbon” and the increasingly mature urban refined management, the governance responsibility of landfills is no longer limited to the closure node. The later monitoring and control of methane emissions is not only related to environmental safety, but also the continuation and improvement of past operations. The application of high-performance methane detectors is turning “closure” from an end point to a new starting point.
In the future, as more landfills enter the closure stage, methane monitoring equipment will play a more critical role in the green city management system. The continuous integration of technologies such as smart perception, edge computing, and remote operation and maintenance will further expand its functional boundaries, making it an environmental guardian throughout the entire life cycle of the landfill.
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