Eighth International Conference on Case Histories in Geotechnical Engineering
Effect of Moisture Content on CO2 Sequestration by BOF Slag in Landfill Cover
Publication: Geo-Congress 2019: Geoenvironmental Engineering and Sustainability (GSP 312)
ABSTRACT
Among many anthropogenic sources of greenhouse gases (GHG), landfill emissions, consisting of methane (CH4) and carbon dioxide (CO2), are one of the major contributors of anthropogenic GHG. In recent years, various innovative landfill biocovers have been investigated and developed to mitigate the emissions of methane (CH4) from municipal solid waste (MSW) landfills. However, the problem of CO2 emissions [which constitute about 40% of landfill gas (LFG)] from MSW landfills still remains unresolved. An innovative cover system which consists of basic oxygen furnace (BOF) 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 methane oxidation, while BOF slag could be 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, CO2 sequestration potential of BOF slag was evaluated under synthetic LFG condition. The performance of the BOF slag in sequestering CO2 under different moisture condition was also examined. The results showed that BOF slag can sequester substantial amount of CO2 under LFG condition. The study also enlightened the importance of moisture for initiating carbonation reaction; however, the moisture alone was not the controlling parameter for CO2 sequestration. The mineralogy of the BOF slag plays an important role in determining CO2 sequestration capacity of the slag.
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ACKNOWLEDGEMENTS
This project is funded by the U.S. National Science Foundation (grant CMMI #1724773), which is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The authors greatly acknowledge Phoenix Services, LLC, for being industrial partner on this project and providing slag samples used for this study.
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Information & Authors
Information
Published In
Geo-Congress 2019: Geoenvironmental Engineering and Sustainability (GSP 312)
Pages: 158 - 166
Editors: Christopher L. Meehan, Ph.D., University of Delaware, Sanjeev Kumar, Ph.D., Southern Illinois University Carbondale, Miguel A. Pando, Ph.D., University of North Carolina Charlotte, and Joseph T. Coe, Ph.D., Temple University
ISBN (Online): 978-0-7844-8214-8
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Mar 21, 2019
Published in print: Mar 21, 2019
ASCE Technical Topics:
- [Inorganic compounds]
- Air pollution
- Carbon compounds
- Carbon dioxide
- Chemicals
- Chemistry
- Emissions
- Engineering materials (by type)
- Environmental engineering
- Hydrologic engineering
- Hydrologic properties
- Hydrology
- Landfills
- Materials engineering
- Methane
- Municipal wastes
- Organic compounds
- Pollutants
- Pollution
- Slag
- Thermal pollution
- Waste management
- Waste sites
- Wastes
- Water and water resources
- Water content
Authors
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