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Anthropogenic emissions of greenhouse gases (GHG) have increased tremendously in recent years and has thus brought global attention towards mitigation of GHG emissions. Landfill emissions like methane (CH4) and carbon dioxide (CO2) are one of the major contributors of anthropogenic greenhouse gases. In recent years, various innovative landfill biocovers have been developed to mitigate the emissions of methane (CH4) from Municipal Solid Waste (MSW) landfills. However, the problem of CO2 emissions (which constitutes about 50% (v/v) of landfill gas (LFG)) from MSW landfills still remains unresolved. An innovative cover system which consists of steel slag with biochar amended soil is being developed to mitigate CH4 and CO2 emissions from landfills. The biochar amended soil is effective in mitigating CH4 emissions by microbial oxidation whereas, BOF slag is effective in sequestering CO2 emissions by carbonation mechanisms. However, the properties of BOF slag vary based on several factors such as mineralogical composition of slag, particle size, moisture content and temperature. In this study, batch experiments were conducted with BOF slag at different temperatures (7°C to 54°C) exposed to a synthetic landfill gas mixture (50% CH4: 50% CO2) to analyze the CO2 removal potential of BOF slag. The results show that there is significant uptake of CO2 by BOF slag whereas, there is no significant trend in CO2 uptake within the range of temperatures tested.
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