What is Landfill Gas Generation?
Landfill Gas (LFG) is a natural byproduct of the decomposition of organic material in municipal solid waste (MSW) landfills. LFG is composed of roughly 50% methane (CH₄), which is a potent greenhouse gas, and 50% carbon dioxide (CO₂), along with a small amount of non-methane organic compounds. Understanding the generation rate is critical for environmental compliance and assessing the potential for energy recovery projects.
How the Calculator Works
This tool utilizes a simplified First-Order Decay (FOD) model, similar to the EPA's LandGEM. The calculation relies on two primary variables: k (the methane generation rate constant) and L₀ (the potential methane generation capacity). The "k" value represents how quickly the waste breaks down, which is heavily influenced by moisture and climate. The "L₀" value represents the total amount of methane a tonne of waste can produce over its lifetime.
How to Use This Tool
To get an estimate for your site, enter the total mass of waste currently stored in the landfill in tonnes. Provide the average number of years the waste has been decomposing. Select the climate type that best matches your region; arid regions have slower decay rates (lower k), while tropical regions experience much faster decomposition (higher k). Clicking calculate will provide the annual methane generation, the total LFG volume, and the carbon footprint equivalent.
Frequently Asked Questions
Is landfill gas dangerous?
In concentrated amounts, methane is flammable and potentially explosive. Furthermore, if not managed, LFG can migrate underground or release odors and hazardous air pollutants into the atmosphere.
Can landfill gas be used for energy?
Yes. Instead of flaring the gas, many modern landfills capture LFG to power turbines or engines to create electricity, or process it into Renewable Natural Gas (RNG) for use in vehicles or pipelines.
Why does moisture matter?
Bacteria require moisture to break down organic matter. This is why landfills in wet climates produce gas much faster than those in desert environments.