[Vanita]

YES<br data-start=”416″ data-end=”419″> Different digesters host different populations of hydrolytic bacteria, acidogens, acetogens, and methanogens. The dominance of specific methanogens (acetoclastic vs. hydrogenotrophic) influences the methane-to-CO₂ ratio in the biogas. The type of organic waste (food waste, manure, crop residues, industrial sludge) also influence microbial metabolism and ultimately the methane percentage in the gas.

Nutrient deficiencies can slow methane production and alter the overall gas composition.

[Dave]

Landfill gas is dramatically different from raw biogas produced inside engineered anaerobic digesters. In our experience across Canada and the United States we’ve seen raw landfill gas contain high percentages of air (+30% air), very high hydrogen sulfide from degrading construction waste, and VOCs from historical landfilling of paint and other chemicals, just to name a few. LFG is tends to be much more variable as gas is drawn from different areas or landfill cells over time.

The biogas composition an an AD site is more driven by the somewhat controlled inputs and the stoichiometry of the degradation products.

[Julie]

Landfill biogas is much more variable and contains more nitrogen, oxygen, and trace contaminants than biogas from controlled anaerobic digestion, making it harder to upgrade and more sensitive to operational changes, and validating its composition is essential because methane levels can fluctuate significantly as well as flow rate over the 20 years operation. It is important to have a robust solution no impacted by air intrusion. Air instrusion can reduce upgrading efficiency of some technologies. With the rightsolution, the methane recovery (often 85–90%) is maintained while reducing fugitive emissions that are 28 to 81 times more climate‑intensive than CO₂, ensuring reliable performance, regulatory compliance, and meaningful methane‑emission reductions.