Quantification of multiple methane emission sources at landfills using a double tracer technique

Area of Science:

• Environmental Science
• Atmospheric Chemistry
• Waste Management

Background:

• Landfills are significant sources of greenhouse gas emissions, particularly methane (CH4).
• Accurate quantification of CH4 emissions from various landfill components is crucial for effective climate change mitigation strategies.

Purpose of the Study:

• To quantify whole-site methane (CH4) emissions from Fakse Landfill using a double tracer technique.
• To identify and quantify CH4 emissions from specific on-site sources, including leachate collection wells, slopes, a composting area, and a sewage sludge storage pit.

Main Methods:

• A double tracer technique was employed to measure CH4 emissions from the entire landfill.
• A scaled-down tracer technique was adapted for localized emission quantification from on-site sources.
• Three field campaigns were conducted to ensure comprehensive data collection.

Main Results:

• Average CH4 emissions from the old landfill section were 32.6 ± 7.4 kg CH4/h, and from the new section were 10.3 ± 5.3 kg CH4/h.
• CH4 emissions from the compost area were 0.5 ± 0.25 kg CH4/h, with CO2 and N2O fluxes of 332 ± 166 kg CO2/h and 0.06 ± 0.03 kg N2O/h.
• The sludge pit emitted 2.4 ± 0.63 kg CH4/h and 0.03 ± 0.01 kg N2O/h.

Conclusions:

• The double tracer technique successfully quantified CH4 emissions from Fakse Landfill and its localized sources.
• Emissions were primarily localized to leachate collection wells and slopes in the old landfill section.
• The study provides essential data for understanding and managing greenhouse gas emissions from landfill operations.