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Waste Manag. 2014 Jul;34(7):1179-90. doi: 10.1016/j.wasman.2014.03.015. Epub 2014 Apr 20.

Mitigation of methane emission from an old unlined landfill in Klintholm, Denmark using a passive biocover system.

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Department of Environmental Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
Ramboll Denmark A/S, DK-5100 Odense C, Denmark.
Klintholm I/S, DK-5874 Hasselager, Denmark.
FluxSense AB/Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
Department of Environmental Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark. Electronic address:


Methane generated at landfills contributes to global warming and can be mitigated by biocover systems relying on microbial methane oxidation. As part of a closure plan for an old unlined landfill without any gas management measures, an innovative biocover system was established. The system was designed based on a conceptual model of the gas emission patterns established through an initial baseline study. The study included construction of gas collection trenches along the slopes of the landfill where the majority of the methane emissions occurred. Local compost materials were tested as to their usefulness as bioactive methane oxidizing material and a suitable compost mixture was selected. Whole site methane emission quantifications based on combined tracer release and downwind measurements in combination with several local experimental activities (gas composition within biocover layers, flux chamber based emission measurements and logging of compost temperatures) proved that the biocover system had an average mitigation efficiency of approximately 80%. The study showed that the system also had a high efficiency during winter periods with temperatures below freezing. An economic analysis indicated that the mitigation costs of the biocover system were competitive to other existing greenhouse gas mitigation options.


Compost; Greenhouse gases; Methane oxidation; Temperate climate; Whole landfill emission measurement

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