Effects of substrate induced respiration on the stability of bottom ash in landfill cover environment.
The municipal solid waste incineration bottom ash is being increasingly used to construct landfill covers in Sweden. In post-closure, owing to increased cover infiltration, the percolating water can add external organic matter to bottom ash. The addition and subsequent degradation of this external organic matter can affect metal mobility through complexation and change in redox conditions. However, the impacts of such external organic matter addition on bottom ash stability have not been fully evaluated yet. Therefore, the objective of this study was to evaluate the impact of external organic matter on bottom ash respiration and metal leaching. The samples of weathered bottom ash were mixed with oven dried and digested wastewater sludge (1%-5% by weight). The aerobic respiration activity (AT4), as well as the leaching of metals, was tested with the help of respiration and batch leaching tests. The respiration and heavy metal leaching increased linearly with the external organic matter addition. Based on the results, it was concluded that the external organic matter addition would negatively affect the quality of landfill cover drainage.
Department of Hydraulic Environmental Engineering, Norwegian University of Science and Technology, Trondheim, Norway Formerly, Division of Water Resources Engineering, Lund University, Lund, Sweden aamir.ilyas@ntnu.no.
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Ilyas
IMAGE, Padova Università, Padova, Italy.
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Lovat
Formerly, Division of Water Resources Engineering, Lund University, Lund, Sweden.
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Persson
D016000:Cluster Analysis; D060729:Coal Ash / Q000032:analysis*; D019216:Metals, Heavy / Q000378:metabolism*; D009930:Organic Chemicals / Q000378:metabolism*; D025341:Principal Component Analysis; D012722:Sewage / Q000737:chemistry; D012988:Soil Microbiology; D013548:Sweden; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D060729:Coal Ash; D019216:Metals, Heavy; D009930:Organic Chemicals; D012722:Sewage; D014874:Water Pollutants, Chemical
Bottom ash; heavy metals; landfill covers; leaching; organic matter; post-closure; substrate induced respiration