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Jan R.,IFAS Ingenieurburo fur Abfallwirtschaft | Stegmann R.,IFAS Ingenieurburo fur Abfallwirtschaft | Ritzkowski M.,TU Hamburg - Harburg | Blank D.,GFA Envest GmbH | And 3 more authors.
Wasser und Abfall | Year: 2011

From closed municipal solid waste landfills, landfill gas are still emitted for over decades. After the closure of a gas energy facility, a long-term landfill for the treatment of the remaining gas would still be necessary in order to guarantee the consequent prevention of methane emissions into the atmosphere. Landfill operators have manifested interest in implementing on their landfill aeration both as a climate protection measure and for the improvement of landfill operations.

Heyer K.-U.,IFAS Ingenieurburo fur Abfallwirtschaft | Hupe K.,IFAS Ingenieurburo fur Abfallwirtschaft | Stegmann R.,IFAS Ingenieurburo fur Abfallwirtschaft
Waste Management | Year: 2013

Within the scope of an investigation for the German Federal Environment Agency ("Umweltbundesamt"), the basics for the estimation of the methane emissions from the landfilling of mechanically and biologically treated waste (MBT) were developed. For this purpose, topical research including monitoring results regarding the gas balance at MBT landfills was evaluated.For waste treated to the required German standards, a methane formation potential of approximately 18-24m3CH4/t of total dry solids may be expected. Monitoring results from MBT landfills show that a three-phase model with differentiated half-lives describes the degradation kinetics in the best way. This is due to the fact that during the first years of disposal, the anaerobic degradation processes still proceed relatively intensively. In addition in the long term (decades), a residual gas production at a low level is still to be expected.Most of the soils used in recultivation layer systems at German landfills show a relatively high methane oxidation capacity up to 5lCH4/(m2h). However, measurements at MBT disposal sites indicate that the majority of the landfill gas (in particular at non-covered areas), leaves the landfill body via preferred gas emission zones (hot spots) without significant methane oxidation. Therefore, rather low methane oxidation factors are recommended for open and temporarily covered MBT landfills. Higher methane oxidation rates can be achieved when the soil/recultivation layer is adequately designed and operated.Based on the elaborated default values, the First Order Decay (FOD) model of the IPCC Guidelines for National Greenhouse Gas Inventories, 2006, was used to estimate the methane emissions from MBT landfills. Due to the calculation made by the authors emissions in the range of 60,000-135,000t CO2-eq./a for all German MBT landfills can be expected. This wide range shows the uncertainties when the here used procedure and the limited available data are applied. It is therefore necessary to generate more data in the future in order to calculate more precise methane emission rates from MBT landfills. This is important for the overall calculation of the climate gas production in Germany which is required once a year by the German Government. © 2013 Elsevier Ltd.

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