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The Danish Biocover Initiative - Methane Mitigation at Older and Smaller Landfills

In 2017, the Biocover Initiative was established with governmental support to obtain methane emissions reductions from older landfills containing organic waste. Due to their decreased cost efficiency, older and smaller landfills present a challenge for utilizing landfill gas for energy purposes. The project relies on bio-oxidation technology which microbially converts methane to biogenic carbon dioxide by filtering the landfill gas through compost layers. Preliminary results from 18 of the 22 established systems show an average methane oxidation efficiency of almost 70% higher than the average extraction efficiency of Danish landfill gas utilization facilities (50%).

Partners

  • Technical University of Denmark
  • Environmental Protection Agency, Ministry of Environment of Denmark
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01 Jan 2017
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Landfill Gas Collection Efficiencies at Danish Landfills

European regulations require landfill gas to be monitored and managed to reduce methane emissions, which can be done using gas collection and biocover systems. There is minimal guidance on how to monitor and assess mitigation actions and as a result the efficiency of mitigation systems is seldom evaluated. This project determined gas collection efficiencies at 23 Danish landfills and compared collection efficiencies with literature values and potential limit values. The research showed that gas collection efficiency could be improved by reducing gas leaks from installations, improving gas collection, securing coverage of landfill surfaces, and repairing damaged cover soil.

Partners

  • Technical University of Denmark
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Publish Date
01 Jan 2018
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Danish Regulation to Limit Methane Emissions from Biogas Production

A Danish Energy Agency study was conducted from 2019-2021 to measure methane emissions in 60 biogas plants. The study revealed a leak rate of 2.5% from biogas production. In 2023, a Danish regulation was implemented with the goal of limiting emissions of methane from biogas plants. The regulation requires annual leak detection, reporting, and implementation of a customized leak detection and repair program. It also enforces an emissions cap of 1% methane loss from upgrading equipment. Measurement campaigns in 2024 and 2025 are planned to assess the effects of the regulation and provide a new emissions factor for national greenhouse gas reporting.

Partners

  • Danish Energy Agency
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Publish Date
01 Jan 2023
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