Landfill Methane Monitoring With Feedback Extraction Control
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Solution Overview
Problem
Landfill gas emissions, particularly methane, often escape into the atmosphere due to permeable or damaged cover layers and insufficient gas extraction rates, making it challenging to manage and quantify emissions effectively across large areas, which can lead to environmental pollution and climate change.
Innovation Solution
A control system and method that utilize a gas emissions model to estimate methane emissions by collecting and processing data on methane concentration and environmental characteristics from multiple locations within a landfill region, allowing for the identification of emission hotspots and implementation of corrective actions such as adjusting gas extraction flow rates or cover materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If gas extraction systems are installed with multiple wells and piping to vacuum sources, then methane emissions are reduced, but device complexity increases
Solution Approach 1:
The patent divides the landfill into multiple regions with multiple gas extraction wells, each equipped with independent flow meters and control systems. This segmentation allows localized monitoring and control of gas extraction, reducing overall emissions while managing system complexity through modular deployment
Solution Approach 2:
The patent implements a feedback control system where flow meters continuously measure gas extraction rates at each well, and controllers automatically adjust vacuum pressure and flow rates based on real-time data. This closed-loop feedback optimizes methane capture efficiency while preventing system overload and reducing operational complexity
2Ease of operation
If manual valves are used to adjust localized vacuum pressure, then gas extraction control is achieved, but measurement precision and automation are reduced
Solution Approach 1:
The patent replaces manual mechanical valve adjustment with automated electronic control systems. Controllers receive input from flow meters and automatically adjust vacuum pressure through electrically actuated valves, eliminating manual intervention while improving both operational ease and measurement precision through continuous digital monitoring
Solution Approach 2:
The system continuously monitors and dynamically adjusts vacuum pressure parameters based on real-time gas flow measurements. By changing operational parameters automatically rather than manually, the system achieves higher measurement precision for emissions quantification while maintaining ease of operation through automated control
3Ease of operation
If portable gas analyzers are used for sampling, then gas characteristics can be measured, but measurement precision and coverage are limited
Solution Approach 1:
The patent combines portable gas analyzers with fixed installation at gas extraction wells, merging the portability and flexibility of handheld devices with the continuous monitoring capability of fixed installations. This integration enables comprehensive gas characteristic measurement across multiple locations while improving overall measurement precision through coordinated data collection
Solution Approach 2:
The gas analysis system is designed to serve multiple functions: identifying emission hotspots, measuring gas composition for extraction optimization, and providing data for environmental compliance. This multi-functionality extends the utility of gas sampling equipment beyond simple measurement to comprehensive emissions management
4Object-generated harmful factors
If gas extraction flow rates are increased, then methane capture improves, but energy consumption and operational cost increase
Solution Approach 1:
The patent implements dynamic control of vacuum pressure and gas extraction flow rates based on real-time measurements from flow meters and gas analyzers. Rather than maintaining constant high extraction rates, the system dynamically adjusts parameters to match actual emission conditions, maximizing methane capture while minimizing unnecessary energy consumption
Solution Approach 2:
The system continuously monitors gas flow and composition parameters, automatically adjusting vacuum pressure and extraction rates to optimize the balance between methane capture efficiency and energy consumption. By changing operational parameters based on measured conditions rather than maintaining fixed settings, the system reduces energy use while maintaining effective emissions control
Data Source
AI summary
There is provided techniques for determining an estimate of gas emissions in a landfill. Some techniques provide for obtaining a plurality of measures and determining an estimate of methane emissions by using a gas emissions model to process the plurality of measures, and outputting the estimate of methane emissions. The plurality of measures may include emissions measurements such as methane emissions and/or measures of at least one environmental characteristic such as wind speed and/or direction, turbulence, and/or atmospheric stability. The estimate of gas emissions may be displayed and/or used to determine whether to cause a corrective action to be performed, such as adjusting a flow rate of landfill gas being extracted from the landfill.