One-quarter of methane generated in the landfill cannot be captured by gas recovery systems due to low concentration of methane and resulting poor economy or is diffusely emitted during or after finishing the gas collection. A portion thereof can be oxidized in a landfill surface layer with a methane oxidizing substrate, such as compost or residues from mechanical-biological waste treatment. By this means the residual methane emissions can be reduced by about 60 percent in the case of the deposition of MSW.
In the case of deposition of waste pre-treated by the MBP technology (see chapter 12.6) emission characteristic is different: Emission potential is 10 to 45 Nm3/ton of waste dry matter which equals about one-tenth of untreated waste. Methane production already starts after one month rather than one to two years in the case of untreated waste, and long lasting emissions at high concentration do not take place. Methane oxidation potential of a specially constructed landfill cover exhibits the landfill gas emission into the atmosphere. Hence practically no emissions will occur from the landfill after deposition of MBP pre-treated waste.
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